00 Cover_ML 551x_651x SF 4700 Ml 5510 6510 Error Codes

User Manual: SF 4700

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4. Alignment and Troubleshooting

Service Manual

ML-551x / 651x series

4-36 Samsung Electronics

4.2.2 Error Message and Troubleshooting

Messages appear on the Smart Panel program window or on the control panel to indicate machine status or

errors. Refer to the tables below to correct the problem.

Error Code Error Message Troubleshooting

Page

A1-1110 Actuator Motor Failure #A1-1110: Turn off then on. 4-40 Page

A1-1210 Actuator Motor Failure #A1-1210: Turn off then on. 4-42 Page

A1-1310 Actuator Motor Failure #A1-1310: Turn off then on. 4-44 Page

A1-3110 Actuator Motor Failure #A1-3110: Turn off then on. 4-46 Page

A2-1910 Actuator Fan Failure: #A2-1910. Turn off then on. 4-48 Page

A2-1920 Actuator Fan Failure: #A2-1920. Turn off then on 4-49 Page

A2-2410 Actuator Fan Failure: #A2-2410. 4-50 Page

A3-2110 Actuator Sensor Failure: #A3-2110. 4-51 Page

A3-5110 Actuator Sensor Failure: #A3-5110. 4-51 Page

C1-1110 C1-1110 Prepare new toner cartridge. 4-52 Page

C1-1120 C1-1120 Replace with new toner cartridge 4-52 Page

C1-1140 C1-1140 Replace with new toner cartridge 4-52 Page

C1-1311 Toner Failure: #C1-1311: Install toner again 4-53 Page

C1-1330

C1-1411

Toner Failure: #C1-1330: Install toner again

Toner cartridge is not installed. Install it 4-54 Page

C1-1412 Did not supply enough toner. Reinstall it 4-53 Page

C1-1413 Shake toner cartridge and then install. 4-53 Page

C1-1512 Toner cartridge is not compatible. Check guide 4-54 Page

C3-1110 Prepare new imaging unit 4-55 Page

C3-1120

C3-1140

Replace with new imaging unit

Replace with new imaging unit 4-55 Page

C3-1312 Imaging Unit Failure #C3-1312: Install IMG. unit. 4-53 Page

C3-1315 Imaging Unit Failure #C3-1315: Install IMG. unit. 4-53 Page

C3-1320

C3-1330

C3-1411

C3-1412

Imaging Unit Failure #C3-1320: Install IMG. unit.

Imaging Unit Failure #C3-1330: Install IMG. unit.

Imaging unit is not installed. Install the unit.

Did not supply enough toner. Reinstall Toner

4-55 page

C3-1512

C3-1514

Imaging unit is not compatible. Check guide

Imaging unit is not compatible. Check guide 4-56 Page

C5-1510 Imaging Unit Failure #C3-1330: Turn off then on. 4-56 Page

C6-1110

C6-1120

Replace with new fuser unit

Replace with new fuser unit 4-57 Page

C7-1110

C7-1120

Waste toner container is almost full. Replace with new one

Waste toner container is almost full. Replace with new one 4-57 Page

C7-1310 Install waste toner container. 4-57 Page

4. Alignment and Troubleshooting

Service Manual

ML-551x / 651x series

4-37 Samsung Electronics

Error Code Error Message Troubleshooting

Page

H1-1210

H1-1310

H1-1410

H1-1510

Paper Jam in Tray2

Paper Jam in Tray3

Paper Jam in Tray4

Paper Jam in Tray5

4-58 Page

H1-1222

H1-1322

H1-1422

H1-1522

Tray 2 cassette is pulled out. Insert it properly.

Tray 3 cassette is pulled out. Insert it properly.

Tray 4 cassette is pulled out. Insert it properly.

Tray 5 cassette is pulled out. Insert it properly.

4-59 Page

H1-1230 (Tray2)

H1-1233 (Tray2)

H1-1330 (Tray3)

H1-1333 (Tray3)

H1-1430 (Tray4)

H1-1433 (Tray4)

H1-1530 (Tray5)

H1-1533 (Tray5)

H1-2230 (Tray2-HCF)

H1-2233 (Tray2-HCF)

H1-2330 (Tray3-HCF)

H1-2333 (Tray3-HCF)

H1-2430 (Tray4-HCF)

H1-2433 (Tray4-HCF)

Input System Failure #H1-1230:Check Tray 2 connection.

Input System Failure #H1-1233:Check Tray 2 connection.

Input System Failure #H1-1330:Check Tray 3 connection.

Input System Failure #H1-1333:Check Tray 3 connection.

Input System Failure #H1-1430:Check Tray 4 connection.

Input System Failure #H1-1433:Check Tray 4 connection.

Input System Failure #H1-1530:Check Tray 5 connection.

Input System Failure #H1-1533:Check Tray 5 connection.

Input System Failure #H1-2230:Check HCF 2 connection.

Input System Failure #H1-2233:Check HCF 2 connection.

Input System Failure #H1-2330:Check HCF 3 connection.

Input System Failure #H1-2333:Check HCF 3 connection.

Input System Failure #H1-2430:Check HCF 4 connection.

Input System Failure #H1-2433:Check HCF 4 connection.

4-60 page

H1-1252

H1-1352

H1-1452

H1-1552

Paper Empty in Tray 2

Paper Empty in Tray 3

Paper Empty in Tray 4

Paper Empty in Tray 5

4-61 Page

H1-1253

H1-1353

H1-1453

H1-1553

Error: #H1-1253

Error: #H1-1353

Error: #H1-1453

Error: #H1-1553

4-62 Page

H1-2210

H1-2310

H1-2410

Paper Jam in HCF2

Paper Jam in HCF3

Paper Jam in HCF4

4-63 Page

H1-2222

H1-2322

H1-2422

HCF 2 cassette Out

HCF 3 cassette Out

HCF 4 cassette Out

4-64 Page

H1-2252

H1-2352

H1-2452

Paper Empty in HCF 2

Paper Empty in HCF 3

Paper Empty in HCF 4

4-65 Page

H1-2253

H1-2353

H1-2453

Error: #H1-2253

Error: #H1-2353

Error: #H1-2453

4-66 Page

H2-1100 Paper jam inside of ﬁ nisher. Remove paper 4-67 Page

4. Alignment and Troubleshooting

Service Manual

ML-551x / 651x series

4-38 Samsung Electronics

Error Code Error Message Troubleshooting

Page

H2-1101 Paper jam in front of ﬁ nisher. Remove paper 4-68 Page

H2-1102 Paper jam inside of ﬁ nisher. Remove paper 4-69 Page

H2-1200 Paper jam inside of ﬁ nisher. Remove paper 4-70 Page

H2-1300 Paper jam at exit of ﬁ nisher. Remove paper 4-71 Page

H2-1302 Paper jam at exit of ﬁ nisher. Remove paper 4-72 Page

H2-1710

H2-1711

Finisher Failure: #H2-1710. Check ﬁ nisher

Finisher Failure: #H2-1711. Check ﬁ nisher 4-73 Page

H2-1720

H2-1721

Finisher Failure: #H2-1720. Check ﬁ nisher

Finisher Failure: #H2-1721. Check ﬁ nisher 4-74 Page

H2-1730

H2-1731

Finisher Failure: #H2-1730. Check ﬁ nisher

Finisher Failure: #H2-1731. Check ﬁ nisher 4-75 Page

H2-1A70

H2-1750

H2-1751

H2-1753

Finisher Failure: #H2-1A70. Check ﬁ nisher

Finisher Failure: #H2-1750. Check ﬁ nisher

Finisher Failure: #H2-1751. Check ﬁ nisher

Finisher Failure: #H2-1753. Check ﬁ nisher

4-76 Page

H2-1752 Finisher Failure: #H2-1752. Check ﬁ nisher 4-77 Page

H2-1760

H2-1A80

Finisher Failure: #H2-1760. Check ﬁ nisher

Finisher Failure: #H2-1A80. Check ﬁ nisher 4-78 Page

H2-1800 Finisher Failure: #H2-1800. Check ﬁ nisher 4-79 Page

H2-1A20 Finisher door is open. Close it 4-80 Page

H2-1A32 Too much paper in ﬁ nisher stacker. Remove printed paper 4-82 Page

H2-1A50 Finisher Failure: #H2-1A50. Check ﬁ nisher 4-83 Page

H2-1A62 Staple cartridge is low. Replace it 4-84 page

H2-1A63 Staple cartridge is empty. Replace it 4-85 Page

H2-4100 Paper jam in front of mailbox. Remove paper 4-86 page

H2-4101 Paper jam inside of mailbox. Remove paper 4-87 page

H2-4102 Paper jam inside of mailbox. Remove paper 4-88 Page

H2-4200 Paper jam in front of bin 1. Remove paper 4-89 Page

H2-4201 Paper jam at mailbox bin 1. Remove paper 4-90 Page

H2-4202 Paper jam at mailbox bin 1. Remove paper 4-91 Page

H2-4300 Paper jam in front of bin 2. Remove paper 4-92 Page

H2-4301 Paper jam at mailbox bin 2. Remove paper 4-93 Page

H2-4302 Paper jam at mailbox bin 2. Remove paper 4-94 Page

H2-4400 Paper jam in front of bin 3. Remove paper 4-95 Page

H2-4401 Paper jam at mailbox bin 3. Remove paper 4-96 Page

H2-4402 Paper jam at mailbox bin 3. Remove paper 4-97 Page

H2-4500 Paper jam in front of bin 4. Remove paper 4-98 Page

H2-4501 Paper jam at mailbox bin 4. Remove paper 4-99 Page

H2-4502 Paper jam at mailbox bin 4. Remove paper 4-100 Page

4. Alignment and Troubleshooting

Service Manual

ML-551x / 651x series

4-39 Samsung Electronics

Error Code Error Message Troubleshooting

Page

H2-4700

H2-4701

Mailbox Failure: #H2-4700. Check mailbox

Mailbox Failure: #H2-4701. Check mailbox 4-101 Page

H2-4710

H2-4711

Mailbox Failure: #H2-4710. Check mailbox

Mailbox Failure: #H2-4711. Check mailbox 4-102 page

H2-4A20 Mailbox door is open. Close it 4-103 Page

H2-4A32 Too much paper in mailbox bin 1. Remove printed paper 4-104 Page

H2-4A35 Too much paper in mailbox bin 2. Remove printed paper 4-105 Page

H2-4A38 Too much paper in mailbox bin 3. Remove printed paper 4-106 Page

H2-4A3C Too much paper in mailbox bin 4. Remove printed paper 4-107 Page

M1-1110 Paper Jam in Tray 1 4-108 Page

M1-1610 Paper Jam in MP tray 4-108 Page

M1-3122 Tray1 cassette is pulled out. Insert it properly 4-109 Page

M1-4111 Input System Failure: #M1-4111. 4-109 Page

M1-5112 Paper Empty in tray1 4-110 Page

M1-5612 Paper Empty in MP 4-110 Page

M2-1110 Paper Jam in tray1 4-111 Page

M2-2110 Jam top of duplex 4-111 Page

M2-2310 Jam bottom of duplex 4-112 Page

M2-3120 Install duplex unit. 4-112 Page

M3-1110 Jam in exit area 4-113 Page

M3-2130 Output bin full. Remove printed paper 4-113 Page

S2-4110 Door is open. Close it 4-114 Page

S2-4610 Rear Door is open. Close it 4-115 Page

S6-3123 This IP address conﬂ icts with that of other system 4-116 Page

S6-3128 802.1x Network Error Contact the Admin. 4-116 Page

U1-2115 Fuser Unit Failure: #U1-2115. Turn off then on 4-117 Page

U1-2117 Fuser Unit Failure: #U1-2117. Turn off then on 4-120 Page

U1-2320 Fuser Unit Failure: #U1-2320. Turn off then on 4-122 Page

U1-2330 Fuser Unit Failure: #U1-2330. Turn off then on 4-125 Page

U1-2340 Fuser Unit Failure: #U1-2340. Turn off then on 4-129 Page

U2-1111 LSU Unit Failure: #U2-1111. Turn off then on 4-132 Page

U2-1113 LSU Unit Failure: #U2-1113. Turn off then on 4-133 Page

4. Alignment and Troubleshooting

Service Manual

ML-551x / 651x series

4-40 Samsung Electronics

 Code

A1-1110

 Error message

Actuator Motor Failure #A1-1110: Turn off then on.

 Symptom / Cause

After working the main BLDC motor, the Ready signal has not occurred within 1 sec.

1. Harness is defective. Connector is not connected properly.

2. OPC coupler in the imaging unit has overloaded.

3. Main BLDC motor is defective.

4. Engine board is defective.

 Troubleshooting method :

叛First, turn the machine off then on. If the error persists, refer to the following.

1. Check if the connector is connected properly. Reconnect it.

Main BLDC

connector

Main BLDC

connector

2. OPC coupler has overloaded.

After removing the imaging unit, rotate the OPC coupler.

If there is any damage, the OPC coupler can’t rotate well.

Replace the imaging unit.

OPC coupler

Spec : 4kgf.cm

4. Alignment and Troubleshooting

Service Manual

ML-551x / 651x series

4-41 Samsung Electronics

3. The main BLDC motor is defective.

- Unplug the connector from the motor.

- Replace the main BLDC motor with new one.

4. If the problem persists, replace the engine board.

4. Alignment and Troubleshooting

Service Manual

ML-551x / 651x series

4-42 Samsung Electronics

 Code

A1-1210

 Error message

Actuator Motor Failure #A1-1210: Turn off then on.

 Symptom / Cause

After working the Fuser BLDC motor, the Ready signal has not occurred within 1 sec.

1. Harness is defective. Connector is not connected properly.

2. Heat roller in the fuser unit has overloaded.

3. Main BLDC motor is defective.

4. Engine board is defective.

 Troubleshooting method

叛First, turn the machine off then on. If the error persists, refer to the following.

1. Check if the connector is connected properly. Reconnect it.

Fuser BLDC

connector

Fuser BLDC

connector

2. Heat roller in the fuser unit has overloaded.

- Remove the fuser unit after removing rear cover and duplex unit.

- Rotate the heat roller gear. If there is any damage, the heat roller gear can’t rotate well.

(Spec : 5kgf.cm)

Replace the fuser unit.

Heat Roller Gear (Spec : 5kgf.cm)Heat Roller Gear (Spec : 5kgf.cm)

4. Alignment and Troubleshooting

Service Manual

ML-551x / 651x series

4-43 Samsung Electronics

3. Engine Board is defective.

- Unplug all connectors on the Engine Board.

- Remove 4 screws.

- Replace the Engine Board with new one.

Remove all the connectors.Remove all the connectors.

4. Fuser BLDC Motor is defective.

- Remove the Main Drive unit. (Screw 5 EA, Lever Coupler)

- Remove the Engine Board & Engine Board bracket.

- Remove the Main Board & Main Board bracket.

- Remove the Rear Cover and duplex unit.

- Remove the fuser unit.

- Replace the fuser drive unit with new one.

Main Drive unit Main Board

Engine board & Bracket

Main Drive unit Main Board

Engine board & Bracket

4. Alignment and Troubleshooting

Service Manual

ML-551x / 651x series

4-44 Samsung Electronics

 Code

A1-1310

 Error message

Actuator Motor Failure #A1-1310: Turn off then on.

 Symptom / Cause

After working the Pick-up BLDC motor, the Ready signal has not occurred within 1 sec.

1. Harness is defective. Connector is not connected properly.

2. Pick up/ Regi. clutch is defective.

3. Main BLDC motor is defective.

4. Engine board is defective.

 Troubleshooting method

叛First, turn the machine off then on. If the error persists, refer to the following.

1. Check if the connector is connected properly. Reconnect it.

Check the connectorCheck the connector

2. Pick up/ Regi clutch is defective.

- Remove the Regi. clutch then warm up the machine.

If the corresponding error has disappeared, Regi. clutch is defective. Replace the Regi. clutch.

- Remove the pick up clutch then warm up the machine.

If the corresponding error has disappeared, pick up clutch is defective. Replace the pick up clutch.

Regi clutch connector

Pick up clutch connector

Regi clutch connector

Pick up clutch connector

4. Alignment and Troubleshooting

Service Manual

ML-551x / 651x series

4-45 Samsung Electronics

3. Pick up BLDC motor is defective.

- Unplug all connectors on the Engine Board.

- Remove the Engine board with the bracket.

- Replace the BLDC motor with new one.

Remove all the connectors.Remove all the connectors.

4. Engine Board is defective.

- Unplug all connectors.

- Replace the Engine board with new one after removing 4 screws.

4. Alignment and Troubleshooting

Service Manual

ML-551x / 651x series

4-46 Samsung Electronics

 Code

A1-3110

 Error message

Actuator Motor Failure #A1-3110

 Symptom / Cause

After working the Deve BLDC motor, the Ready signal has not occurred within 1 sec.

1. Harness is defective. Connector is not connected properly.

2. Mag. Roller is overloaded.

3. Deve BLDC motor is defective.

4. Engine board is defective.

 Troubleshooting method

叛First, turn the machine off then on. If the error persists, refer to the following.

1. Check if the connector is connected properly. Reconnect it.

Check the connectorCheck the connector

2. Mag roller in the imaging unit is overloaded.

- Rotate the Mag roller. If there is any damage, the Mag roller can’t be rotated well.

(Spec : 4kgf.cm)

Replace the imaging unit.

Mag roller (Spec : 4kgf.cm)

4. Alignment and Troubleshooting

Service Manual

ML-551x / 651x series

4-47 Samsung Electronics

3. Deve BLDC motor is defective.

- Replace the BLDC motor with new one.

4. Engine Board is defective.

- Unplug all connectors.

- Replace the Engine board with new one after removing 4 screws.

Remove all the connectors.Remove all the connectors.

4. Alignment and Troubleshooting

Service Manual

ML-551x / 651x series

4-48 Samsung Electronics

 Code

A2-1910

 Error message

Actuator Fan Failure: #A2-1910. Turn off then on.

 Symptom / Cause

The Main(SMPS) Fan does not work normally.

1. Fan Harness connection is bad.

2. Harness is defective or GND is short.

3. Fan is defective.

 Troubleshooting method

1. Check if the Fan Relay connector is connected properly.

2. Connect the Harness Housing correctly.

3. Check if the Fan harness is normal. If it is defective, replace it.

4. Enter the Tech mode and execute the Main Fan test (EDC code : 100-0260 (SMPS FAN).

To enter the Tech mode, press the button in this order.

(Menu - # - 1 - 9 -3 -4 - OK )

SMPS FANSMPS FAN

4. Alignment and Troubleshooting

Service Manual

ML-551x / 651x series

4-49 Samsung Electronics

 Code

A2-1920

 Error message

Actuator Fan Failure: #A2-1920. Turn off then on

 Symptom / Cause

The Rear Fan does not work normally.

1. Fan Harness connection is bad.

2. Harness is defective or GND is short.

3. Fan is defective.

 Troubleshooting method

1. Check if the Fan Relay connector is connected properly.

2. Connect the Harness Housing correctly.

3. Check if the Fan harness is normal. If it is defective, replace it.

4. Enter the Tech mode and execute the Main Fan test (EDC code : 109-0042 (Rear FAN).

To enter the Tech mode, press the button in this order.

(Menu - # - 1 - 9 -3 -4 - OK )

4. Alignment and Troubleshooting

Service Manual

ML-551x / 651x series

4-50 Samsung Electronics

 Code

A2-2410

 Error message

Actuator Fan Failure: #A2-2410.

 Symptom / Cause

The LSU Fan does not work.

 Troubleshooting method

1. Check if there is any obstacle in LSU Fan.

2. Check if the harness is connected properly.

3. Check if the joint connector is connected properly.

4. Check if the harness is defective.

5. Enter the tech mode and execute the LSU fan test.

6. If the fan is defective, replace it.

LSU FANLSU FAN

4. Alignment and Troubleshooting

Service Manual

ML-551x / 651x series

4-51 Samsung Electronics

 Code

A3-2110

 Error message

Actuator Sensor Failure: #A3-2110.

 Symptom / Cause

ID control algorithm to control the density ﬁ nds the ID Sensor value input in an abnormal state.

1. The image density of the imaging unit is abnormal.

2. ID sensor (CTD sensor) is defective.

 Troubleshooting method

1. In case of density defect.

Print the sample page. If the density is too low or dark, replace the imaging unit.

2. In case of ID sensor defect.

Print the sample page. If the density is normal, replace the ID sensor or the sensor cleaning part.

 Code

A3-5110

 Error message

Actuator Sensor Failure: #A3-5110.

 Symptom / Cause

The signal level of the Toner Empty sensor is 0V.

 Troubleshooting method

1. Remove the Left cover. Check if the sensor connector of the WTB Pipe unit is connected properly.

2. If the harness is defective, replace it.

4. Alignment and Troubleshooting

Service Manual

ML-551x / 651x series

4-52 Samsung Electronics

 Code

C1-1110

 Error message

C1-1110 Prepare new toner cartridge.

 Symptom / Cause

The remaining toner in cartridge is less than 10% of its life.

(10% is default, this value can be adjusted.)

 Troubleshooting method

Check the life remaining of the toner cartridge.

If its life is at the end, turn the machine off and replace the toner cartridge with new one.

 Code

C1-1120

 Error message

C1-1120 Replace with new toner cartridge

 Symptom / Cause

The remaining toner in cartridge is less than 0% of its life.

 Troubleshooting method

Check the life remaining of the toner cartridge.

If its life is at the end, turn the machine off and replace the toner cartridge with new one.

 Code

C1-1140

 Error message

C1-1140 Replace with new toner cartridge

 Symptom / Cause

The toner cartridge is at the end of its life.

 Troubleshooting method

Replace the toner cartridge with new one.

4. Alignment and Troubleshooting

Service Manual

ML-551x / 651x series

4-53 Samsung Electronics

 Code

C1-1311

C1-1412

C1-1413

C3-1312

C3-1315

 Error message

Toner Failure: #C1-1311: Install toner again

Did not supply enough toner. Reinstall it

Shake toner cartridge and then install.

Imaging Unit Failure #C3-1312: Install IMG. unit.

Imaging Unit Failure #C3-1315: Install IMG. unit.

 Symptom / Cause

The imaging unit does not get enough toner from the toner cartridge.

1. The toner cartridge shutter does not work normally.

2. The imaging unit shutter does not work normally.

3. The toner cartridge seal is not removed.

4. The toner cartridge is not installed properly.

5. The toner is consumed quickly due to a defective image (Background etc.)

 Troubleshooting method

1. Turn the machine off then on.

2. Remove the toner cartridge.

Thoroughly roll the cartridge ﬁ ve or six times to distribute the toner evenly inside the cartridge.

And reinstall the toner cartridge.

3. Try to print out the sample page more than 20 pages.

4. Check the toner cartridge.

- Check if the toner supply shutter between the toner cartridge and the imaging unit works normally.

- Remove the seal. Check if the auger rotates normally.

- Reinstall the toner cartridge.

5. Replace the toner cartridge. Print out the sample page.

6. Check if the toner supply motor works normally.

4. Alignment and Troubleshooting

Service Manual

ML-551x / 651x series

4-54 Samsung Electronics

 Code

C1-1330

C1-1411

 Error message

Toner Failure: #C1-1330: Install toner again

Toner cartridge is not installed. Install it

 Symptom / Cause

1. The toner cartridge is not installed.

2. The toner cartridge is not installed properly.

 Troubleshooting method

1. Install the genuine samsung toner cartridge.

2. If the toner cartridge is already installed, check the following.

a. Reinstall the toner cartridge and imaging unit.

b. Check If the CRUM contact is normal.

c. After reinstallation, turn the machine off then on.

 Code

C1-1512

 Error message

Toner cartridge is not compatible. Check guide

 Symptom / Cause

Toner cartridge is not compatible.

 Troubleshooting method

1. Check information of the toner cartridge.

2. If the toner cartridge is not a genuine samsung toner cartridge, replace with new one.

4. Alignment and Troubleshooting

Service Manual

ML-551x / 651x series

4-55 Samsung Electronics

 Code

C3-1110

C3-1120

C3-1140

 Error message

Prepare new imaging unit

Replace with new imaging unit

 Symptom / Cause

The remaining life of the imaging unit is less than 10% of its life.

The remaining life of the imaging unit is less than 0% of its life.

 Troubleshooting method

Prepare the new imaging unit.

 Code

C3-1320

C3-1330

C3-1411

C3-1412

 Error message

Imaging Unit Failure #C3-1320: Install IMG. unit.

Imaging Unit Failure #C3-1330: Install IMG. unit.

Imaging unit is not installed. Install the unit.

Did not supply enough toner. Reinstall Toner

 Symptom / Cause

1. The imaging unit is not installed.

2. The imaging unit is not installed properly.

 Troubleshooting method

1. Install the samsung genuine imaging unit.

2. If the imaging unit is already installed, check the following.

a. Reinstall the toner cartridge and imaging unit.

b. Check If the CRUM contact is normal.

c. After reinstallation, turn the machine off then on.

4. Alignment and Troubleshooting

Service Manual

ML-551x / 651x series

4-56 Samsung Electronics

 Code

C3-1512

C3-1514

 Error message

Imaging unit is not compatible. Check guide

 Symptom / Cause

The imaging unit is not compatible.

 Troubleshooting method

1. Check information of the imaging unit.

2. If the imaging unit is not a Samsung genuine imaging unit, replace with new one.

 Code

C5-1510

 Error message

 Symptom / Cause

The imaging unit does not get the normal high voltage.

1. The imaging unit is not installed properly.

2. The contact between the machine and the imaging unit is bad.

3. The imaging unit is defective.

 Troubleshooting method

1. Remove the imaging unit. Check if the contact terminal is contaminated.

Reinstall the imaging unit. And turn the machine off then on.

Print 10 sample pages for test.

2. If the problem persists, replace the imaging unit.

3. If the problem persists after removing the imaging unit, replace the HVPS board or the engine board.

4. Alignment and Troubleshooting

Service Manual

ML-551x / 651x series

4-57 Samsung Electronics

 Code

C6-1110

C6-1120

 Error message

Replace with new fuser unit

 Symptom / Cause

The fuser unit is at the end of its life.

 Troubleshooting method

1. Remove the Rear cover and Duplex unit.

Replace the fuser unit after removing 4 screws.

2. Tighten 4 screws. Assemble the Rear Cover and Duplex Unit.

 Code

C7-1110

C7-1120

 Error message

Waste toner container is almost full. Replace with new one

 Symptom / Cause

The waste toner container is full.

 Troubleshooting method

Replace the waste toner container with new one.

 Code

C7-1310

 Error message

Install waste toner container.

 Symptom / Cause

The waste toner container is full.

 Troubleshooting method

Install the waste toner container.

If the waste toner container is already installed, remove and reinstall it.

4. Alignment and Troubleshooting

Service Manual

ML-551x / 651x series

4-58 Samsung Electronics

 Code

H1-1210

H1-1310

H1-1410

H1-1510

 Error message

Paper Jam in Tray2

Paper Jam in Tray3

Paper Jam in Tray4

Paper Jam in Tray5

 Symptom / Cause

A jammed paper has occurred in the option cassette. (SCF unit)

 Troubleshooting method

1. Remove the jammed paper.

If the problem persists, check the followings.

2. Check if the paper is loaded in the SCF tray

properly.

3. Check if the roller is defective or worn out.

4. Check if the Empty/ Pick up/ Regi-Act

sensor is working properly.

5. Check if the main board/ motor/ clutch

connector are connected properly.

6. Check if the AS-SPRING_ES is deforemd or

assembled properly.

7. Check if the Press D-cut of the Gear-Lifting

is broken.

8. If the problem persists after checking No. 1~7,

replace the SCF main board.

9. If the probelm persists, replace the Drop

connector harness.

Slfnxs#Uroohu

Iruzdug#Uroohu

Empty Sensor

Pickup Sensor

Regi-Act. Sensor

DV0VSULQJbHV

OK NG

4. Alignment and Troubleshooting

Service Manual

ML-551x / 651x series

4-59 Samsung Electronics

 Code

H1-1222

H1-1322

H1-1422

H1-1522

 Error message

Tray2 cassette is pulled out. Insert it properly.

Tray3 cassette is pulled out. Insert it properly.

Tray4 cassette is pulled out. Insert it properly.

Tray5 cassette is pulled out. Insert it properly.

 Symptom / Cause

A optional cassette (SCF) is pulled out.

 Troubleshooting method

1. Check if the optional cassette is inserted propelry. Remove the cassette then re-install it.

2. Check if the Signal-Switch is deformed or broken.

If it is defective, replace it.

4. Alignment and Troubleshooting

Service Manual

ML-551x / 651x series

4-60 Samsung Electronics

 Code

H1-1230 (Tray2)

H1-1233 (Tray2)

H1-1330 (Tray3)

H1-1333 (Tray3)

H1-1430 (Tray4)

H1-1433 (Tray4)

H1-1530 (Tray5)

H1-1533 (Tray5)

H1-2230 (Tray2-HCF)

H1-2233 (Tray2-HCF)

H1-2330 (Tray3-HCF)

H1-2333 (Tray3-HCF)

H1-2430 (Tray4-HCF)

H1-2433 (Tray4-HCF)

 Error message

Input System Failure #H1-1230:Check Tray 2 connection.

Input System Failure #H1-1233:Check Tray 2 connection.

Input System Failure #H1-1330:Check Tray 3 connection.

Input System Failure #H1-1333:Check Tray 3 connection.

Input System Failure #H1-1430:Check Tray 4 connection.

Input System Failure #H1-1433:Check Tray 4 connection.

Input System Failure #H1-1530:Check Tray 5 connection.

Input System Failure #H1-1533:Check Tray 5 connection.

Input System Failure #H1-2230:Check HCF 2 connection.

Input System Failure #H1-2233:Check HCF 2 connection.

Input System Failure #H1-2330:Check HCF 3 connection.

Input System Failure #H1-2333:Check HCF 3 connection.

Input System Failure #H1-2430:Check HCF 4 connection.

Input System Failure #H1-2433:Check HCF 4 connection.

 Symptom / Cause

The communication error between the machine and option cassette has occurred.

 Troubleshooting method

1. Turn the machine off then on.

2. Remove and reinstall the corresponding optional tray.

3. Check if the option tray harness is connected properly. Reconnect or replace the harness.

4. Replace the option tray board.

5. Replace the option tray Assy.

4. Alignment and Troubleshooting

Service Manual

ML-551x / 651x series

4-61 Samsung Electronics

 Code

H1-1252

H1-1352

H1-1452

H1-1552

 Error message

Paper Empty in Tray2

Paper Empty in Tray3

Paper Empty in Tray4

Paper Empty in Tray5

 Symptom / Cause

Paper in the optional cassette is empty.

 Troubleshooting method

1. Check if the paper in optional cassette is loaded. Load the paper.

2. Check if the empty actuator and empty senosr are assembled properly.

3. If the empty actuator is defective, replace it.

4. If the problem persists after replacing the empty actuator, replace the empty sensor.

Empty Sensor

Empty Act.

4. Alignment and Troubleshooting

Service Manual

ML-551x / 651x series

4-62 Samsung Electronics

 Code

H1-1253

H1-1353

H1-1453

H1-1553

 Error message

Error : #H1-1253

Error : #H1-1353

Error : #H1-1453

Error : #H1-1553

 Symptom / Cause

The paper in the optional cassette is not picked up.

 Troubleshooting method

1. Check if the Gear-Idle Lift is broken.

2. Check if the Signal-Swtich is operated properly. If it is defective, replace it.

3. Check if the Lift-Motor connector is connected properly.

4. Check if the Press D-Cut of the Gear-Lifting is deformed or broken.

5. If the problem persists, replace the Lift-Motor.

OK NG

4. Alignment and Troubleshooting

Service Manual

ML-551x / 651x series

4-63 Samsung Electronics

 Code

H1-2210

H1-2310

H1-2410

 Error message

Paper Jam in HCF2

Paper Jam in HCF3

Paper Jam in HCF4

 Symptom / Cause

A jammed paper has occurred in the option cassette. (HCF unit)

 Troubleshooting method

1. Remove the jammed paper.

If the problem persists, check the followings.

2. Check if the paper is loaded in the HCF tray

properly.

3. Check if the roller is defective or worn out.

4. Check if the Empty/ Pick up/ Regi-Act

sensor is working properly.

5. Check if the main board/ motor/ clutch

connector are connected properly.

6. PICK-UP-SPRING is deformed or assembled

properly.

7. If the problem persists after checking No. 1~6,

replace the HCF main board.

8. If the probelm persists, replace the Drop

connector harness.

Slfnxs#Uroohu

Iruzdug#Uroohu

Empty Sensor

Pickup Sensor

Regi-Act. Sensor

SLFN0XS0VSULQJ

4. Alignment and Troubleshooting

Service Manual

ML-551x / 651x series

4-64 Samsung Electronics

 Code

H1-2222

H1-2322

H1-2422

 Error message

HCF 2 cassette Out

HCF 3 cassette Out

HCF 4 cassette Out

 Symptom / Cause

A optional cassette (HCF) is pulled out.

 Troubleshooting method

1. Check if the Cover-Front Door is closed propelry. Open and Close it.

2. Check if the connector of the PBA-SUB Cover Open is connected properly.

If it is defective, replace it.

3. If the connection is OK, replace the PBA-SUB Cover Open.

΁ͳͲ͞΄Άͳ͑ʹΠΧΖΣ͑΀ΡΖΟ

4. Alignment and Troubleshooting

Service Manual

ML-551x / 651x series

4-65 Samsung Electronics

 Code

H1-2252

H1-2352

H1-2452

 Error message

Paper Empty in HCF 2

Paper Empty in HCF 3

Paper Empty in HCF 4

 Symptom / Cause

Paper in the optional cassette (HCF) is empty.

 Troubleshooting method

1. Check if the paper in HCF Unit is loaded. Load the paper.

2. Check if the empty actuator and empty sensor are assembled properly.

3. If the empty actuator is defective, replace it.

4. If the problem persists after replacing the empty actuator, replace the empty sensor.

Empty Act.

Empty Sensor

4. Alignment and Troubleshooting

Service Manual

ML-551x / 651x series

4-66 Samsung Electronics

 Code

H1-2253

H1-2353

H1-2453

 Error message

Error : #H1-2253

Error : #H1-2353

Error : #H1-2453

 Symptom / Cause

The paper in the optional cassette is not picked up.

 Troubleshooting method

1. Check if the Gear-Coupling and Gear-Lift are broken.

2. Check if the SPRING-ES and SPRING-CS are assembled propelry.

3. Check if the Lift-Motor connector is connected properly.

4. Check if the Press D-Cut of the Gear-Lifting is deformed or broken.

5. If the problem persists, replace the Lift-Motor.

Jhdu0Frxsolqj#

Jhdu0Oliw

VSULQJ0FV

VSULQJ0HV

΁ͳͲ͞΄Άͳ͑ʹΠΧΖΣ͑΀ΡΖΟ

4. Alignment and Troubleshooting

Service Manual

ML-551x / 651x series

4-67 Samsung Electronics

 Code

H2-1100

 Error message

Paper jam inside of ﬁ nisher. Remove paper

 Symptom / Cause

Finisher Entrance sensor actuator does not return after a paper covers it

IOT Exit Roller grabs the paper. Or Finisher Feeding Motors Stopped. Or Finisher Entrance Sensor damaged or

harness damaged. Or Finisher Main Board damaged

 Troubleshooting method

1. Check Jam Occurrence in IOT.

- If the IOT roller is grabbing the paper, it’s IOT

fault

2. Check the Main Board Harness Connection.

3. Check Finisher Entrance operation & harness

connection.

4. Check Finisher Feeding Entrance Motor Harness

Connection and operation.

5. Check Finisher Feeding Exit Motor Harness

Connection and operation.

6. If the same problem happens after checking 1~5,

Replace the Finisher main board.

7. If the same problem happens after checking 5,

replace the Finisher harnesses.

4. Alignment and Troubleshooting

Service Manual

ML-551x / 651x series

4-68 Samsung Electronics

 Code

H2-1101

 Error message

Paper jam in front of ﬁ nisher. Remove paper

 Symptom / Cause

Paper doesn’t reach Finisher’s Entrance Sensor.

Paper jam in IOT. Or Finisher Diverter operation not well. Or IOT Deﬂ ector Damaged. Or Finisher Entrance Sensor

not working (Finisher Entrance Sensor Damaged, Harness connection not well, Main Board damaged)

 Troubleshooting method

1. Check Jam Occurrence in IOT.

2. Check IOT Deﬂ ector part’s operation.

3. Check the Main Board Harness Connection.

4. Check Finisher’s Entrance operation & harness

connection

5. Referring to H2-1800, Check the Finisher Diverter

operation.

6. If the same problem happens after checking 1~5,

Replace the Finisher main board.

7. If the same problem happens after checking 6,

replace the Finisher harnesses.

4. Alignment and Troubleshooting

Service Manual

ML-551x / 651x series

4-69 Samsung Electronics

 Code

H2-1102

 Error message

Paper jam inside of ﬁ nisher. Remove paper

 Symptom / Cause

Initialization started with Jammed paper covering Finisher Entrance Sensor.

Paper exists covering Finisher Entrance Sensor. Or Finisher Entrance Sensor Damaged or harness connection not

well. Or Finisher Main Board damaged

 Troubleshooting method

1. Check if there is a jammed paper inside Finisher.

2. Check the Main Board Harness Connection.

3. Check Finisher Entrance operation & harness

connection.

4. If the same problem happens after checking 1~3,

Replace the Finisher main board.

5. If the same problem happens after checking 4,

replace the Finisher harnesses.

4. Alignment and Troubleshooting

Service Manual

ML-551x / 651x series

4-70 Samsung Electronics

 Code

H2-1200

 Error message

Paper jam inside of ﬁ nisher. Remove paper

 Symptom / Cause

Finisher Exit Sensor doesn’t turn on after a paper entered Finisher.

IOT Exit Roller grabs the paper. Or Finisher Feeding Motors Stopped. Or Finisher Exit Sensor damaged or harness

damaged. Or Finisher Main Board damaged

 Troubleshooting method

1. Check Jam Occurrence in IOT.

- If the IOT roller is grabbing the paper, it’s IOT

fault.

2. Check the Main Board Harness Connection.

3. Check Finisher Exit Sensor operation & harness

connection.

4. Check Finisher Feeding Entrance Motor Harness

Connection and operation.

5. Check Finisher Feeding Exit Motor Harness

Connection and operation.

6. If the same problem happens after checking 1~5,

Replace the Finisher main board.

7. If the same problem happens after checking 6,

replace the Finisher harnesses.

4. Alignment and Troubleshooting

Service Manual

ML-551x / 651x series

4-71 Samsung Electronics

 Code

H2-1300

 Error message

Paper jam inside of ﬁ nisher. Remove paper

 Symptom / Cause

Finisher Exit Sensor doesn’t turn off after the sensor turned on

IOT Exit Roller grabs the paper. Or Finisher Feeding Motors Stopped. Or Finisher Exit Sensor damaged or harness

damaged. Or Finisher Main Board damaged

 Troubleshooting method

1. Check Jam Occurrence in IOT.

- If the IOT roller is grabbing the paper, it’s IOT

fault.

2. Check the Main Board Harness Connection.

3. Check Finisher Exit Sensor operation & harness

connection.

4. Check Finisher Feeding Entrance Motor Harness

Connection and operation.

5. Check Finisher Feeding Exit Motor Harness

Connection and operation.

6. If the same problem happens after checking 1~5,

Replace the Finisher main board.

7. If the same problem happens after checking 6,

replace the Finisher harnesses.

4. Alignment and Troubleshooting

Service Manual

ML-551x / 651x series

4-72 Samsung Electronics

 Code

H2-1302

 Error message

Paper jam inside of ﬁ nisher. Remove paper

 Symptom / Cause

Initialization started with Jammed paper covering Finisher Exit Sensor.

Paper exists covering Finisher Exit Sensor. Or Finisher Exit Sensor Damaged or harness connection not well. Or

Finisher Main Board damaged

 Troubleshooting method

1. Check if there is a jammed paper on the feeding

path of Finisher.

2. Check the Main Board Harness Connection.

3. Check Finisher Exit sensors’ operation & harness

connection.

4. If the same problem happens after checking 1~3,

Replace the Finisher main board.

5. If the same problem happens after checking 4,

replace the Finisher harnesses.

4. Alignment and Troubleshooting

Service Manual

ML-551x / 651x series

4-73 Samsung Electronics

 Code

H2-1710

H2-1711

 Error message

Finisher Failure: #H2-1710. Check ﬁ nisher

Finisher Failure: #H2-1711. Check ﬁ nisher

 Symptom / Cause

Front Jogger is not working well.

Front Jogger Home Sensor, Front Jogger Motor Harness Connection not well or damaged, Main Board damaged.

 Troubleshooting method

1. Check the Main Board Harness Connection.

2. Check the Finisher Front Jogger Home Sensor’s

Harness Connection.

3. Check the Finisher Front Jogger Motor’s Harness

Connection and operation.

4. Check if Front jogger part is contaminated.

5. If the same problem happens after checking 1~4,

Replace the Finisher main board.

6. If the same problem happens after checking 5,

Replace the Finisher harnesses.

4. Alignment and Troubleshooting

Service Manual

ML-551x / 651x series

4-74 Samsung Electronics

 Code

H2-1720

H2-1721

 Error message

Finisher Failure: #H2-1720. Check ﬁ nisher

Finisher Failure: #H2-1721. Check ﬁ nisher

 Symptom / Cause

Rear Jogger is not working well.

Rear Jogger Home Sensor, Rear Jogger Motor Harness Connection not well or damaged, Main Board damaged.

 Troubleshooting method

1. Check the Main Board Harness Connection.

2. Check the Finisher Rear Jogger Home Sensor’s

Harness Connection.

3. Check the Finisher Rear Jogger Motor’s Harness

Connection and operation.

4. Check if Rear jogger part is contaminated.

5. If the same problem happens after checking 1~4,

Replace the Finisher main board.

6. If the same problem happens after checking 5,

Replace the Finisher harnesses.

4. Alignment and Troubleshooting

Service Manual

ML-551x / 651x series

4-75 Samsung Electronics

 Code

H2-1730

H2-1731

 Error message

Finisher Failure: #H2-1730. Check ﬁ nisher

Finisher Failure: #H2-1731. Check ﬁ nisher

 Symptom / Cause

Support Finger (Extension Tray) is not working well.

Support Finger Home Sensor, Support Finger Motor Harness Connection not well or damaged, Main Board

damaged

 Troubleshooting method

1. Check the Main Board Harness Connection.

2. Check the Finisher Support Finger Home

Sensor’s Harness Connection.

3. Check the Finisher Support Finger Motor’s

Harness Connection and operation.

4. If the same problem happens after checking 1~3,

Replace the Finisher main board.

5. If the same problem happens after checking 4,

Replace the Finisher harnesses.

4. Alignment and Troubleshooting

Service Manual

ML-551x / 651x series

4-76 Samsung Electronics

 Code

H2-1A70

H2-1750

H2-1751

H2-1753

 Error message

Finisher Failure: #H2-1A70. Check ﬁ nisher

Finisher Failure: #H2-1750. Check ﬁ nisher

Finisher Failure: #H2-1751. Check ﬁ nisher

Finisher Failure: #H2-1753. Check ﬁ nisher

 Symptom / Cause

Stapler is not working well.

Stapler Harness Connection not well. Or Cartridge set sensors damaged, Or Main Board damaged.

 Troubleshooting method

NOTE - Make sure that the staple strips on top of

the stack are complete and ﬂ at. Remove any partial

strips and any strips that are bent.

1. Check the Main Board Harness Connection.

2. Check the Stapler harness connection.

3. Check if staples are stuck in Stapler Head area

and damage of Stapler itself.

4. If the same problem happens after checking 1~3,

Replace the Finisher main board.

5. If the same problem happens after checking 4,

Replace the Finisher Stapler.

6. If the same problem happens after checking 5,

Replace the Finisher harnesses.

4. Alignment and Troubleshooting

Service Manual

ML-551x / 651x series

4-77 Samsung Electronics

 Code

H2-1752

 Error message

Finisher Failure: #H2-1752. Check ﬁ nisher

 Symptom / Cause

Finisher compiles all the papers and moves them to stapling position and do nothing. the message “Stapler Safety

Fault” pops up.

Safety Switch Harness connection not well. Main Board damaged.

 Troubleshooting method

1. Check the Main Board Harness Connection.

2. Check the Safety Switch Harness Connection.

3. Check the Safety Unit’s operation. Check the

switch is clicked when the Safety Link moves.

4. Check the Safety Unit’s operation using Rear

Jogger. The same “switch ON/OFF” operation

should be followed.

5. Check the Safety Unit’s operation.

When Rear Jogger stands at the position having

the Shield and Rear Jogger met, the Safety

Switch should be ON.

6. If the same problem happens after checking 1~5,

Replace the Finisher main board.

7. If the same problem happens after checking 6,

Replace the Finisher harnesses.

4. Alignment and Troubleshooting

Service Manual

ML-551x / 651x series

4-78 Samsung Electronics

 Code

H2-1760

H2-1A80

 Error message

Finisher Failure: #H2-1760. Check ﬁ nisher

Finisher Failure: #H2-1A80. Check ﬁ nisher

 Symptom / Cause

Stacker Unit is not working.

Stacker Level sensor, Stack Full sensor, Stacker Motor Harness Connection not well or damaged, Main Board

damaged.

 Troubleshooting method

1. Check the Main Board Harness Connection.

2. Check the Stacker Level Sensor’s Harness

Connection and Actuator’s operation & its Spring

behind the wall.

3. Check the Stacker Motor Harness Connection

and operation.

4. Check the Stack Full Sensor Connection and

operation.

5. If the same problem happens after checking 1~3,

Replace the Finisher main board.

6. If the same problem happens after checking 4,

replace the Finisher harnesses.

4. Alignment and Troubleshooting

Service Manual

ML-551x / 651x series

4-79 Samsung Electronics

 Code

H2-1800

 Error message

Finisher Failure: #H2-1800. Check ﬁ nisher

 Symptom / Cause

Diverter is not working.

Diverter Motor, Sensor Harness Connection not well or damaged. Main Board Damaged. IOT’s Deﬂ ector

damaged.

 Troubleshooting method

1. Check the Main Board Harness Connection.

2. Check the IOT’s Deﬂ ector operation.

3. Check Diverter sensor harness connection.

4. Diverter Motor Harness Connection and

operation.

5. Check if Diverter Unit is not contaminated.

6. If the same problem happens after checking 1~5,

Replace the Finisher main board.

7. If the same problem happens after checking 6,

replace the Finisher harnesses.

4. Alignment and Troubleshooting

Service Manual

ML-551x / 651x series

4-80 Samsung Electronics

 Code

H2-1A20

 Error message

Finisher door is open. Close it

 Symptom / Cause

Finisher Motors doesn’t work.

Jam Cover Opened, Jam Cover not assembled well or Jam Cover Flag damaged, Stapler Door Opened, Stapler

Door Micro Switch not assembled well or Stapler Door Flag damaged, Harness Damaged. Main Board Damaged,

door ﬂ ag damaged.

 Troubleshooting method

1. Check the Jam Cover and Stapler Door Closed

ﬁ rmly.

2. Check if Mounting Part not damaged

- Male part in Finisher

- Female part in IOT

3. Check the Main Board Harness Connection.

4. Check the Stapler Door Switch Harness

Connection.

5. Check the Stapler Door ﬂ ag damaged.

4. Alignment and Troubleshooting

Service Manual

ML-551x / 651x series

4-81 Samsung Electronics

6. Check the Jam Cover Sensor Harness

connection.

7. Check the Jam Cover ﬂ ag damaged

8. If the same problem happens after checking 1~7,

Replace the Finisher main board.

9. If the same problem happens after checking 8,

replace the Finisher harnesses.

4. Alignment and Troubleshooting

Service Manual

ML-551x / 651x series

4-82 Samsung Electronics

 Code

H2-1A32

 Error message

Too much paper in ﬁ nisher stacker. Remove printed paper

 Symptom / Cause

Finisher Full message pops when papers on the Stacker Tray are stacked fully or the full sensor detecting

mechanism is out of order

Finisher Full detecting sensor damaged, harness connection not well or damaged, Main Board damaged.

 Troubleshooting method

1. Check the Stacker Tray’s Full Sensor Connection and check if Flag is damaged

- The sensor must not be covered besides the full detecting ﬂ ag.

2. Check Finisher Main Board Harness Connection.

3. If the same problem happens after checking 1~2, Replace the Finisher main board.

4. If the same problem happens after checking 3, Replace the Finisher harnesses.

4. Alignment and Troubleshooting

Service Manual

ML-551x / 651x series

4-83 Samsung Electronics

 Code

H2-1A50

 Error message

Finisher Failure: #H2-1A50. Check ﬁ nisher

 Symptom / Cause

Finisher doesn’t work because of Communication error between ﬁ nisher and IOT.

Interface Cable Connection not well or Interface Cable(Harness) damaged, Main Board damaged.

 Troubleshooting method

1. Check if Mounting Part not damaged

- Male part in Finisher

- Female part in IOT

2. Check the Main Board Harness Connection.

3. If the same problem happens after checking 1~2, Replace the Finisher main board..

4. If the same problem happens after checking 3, Replace the Finisher harnesses

4. Alignment and Troubleshooting

Service Manual

ML-551x / 651x series

4-84 Samsung Electronics

 Code

H2-1A62

 Error message

Staple cartridge is low. Replace it

 Symptom / Cause

No more stapling job will not be performed if the near empty Stapler Cartridge will not be replaced soon.

The staples in Staple Cartridge are going to a shortage. Or Stapler harness connection now well. Or Stapler set

sensors damaged, Main Board damaged.

 Troubleshooting method

1. Check if staples in cartridge are in some level.

- With such level like the below picture

during jobs, The sensor detects it as

“Low”. Only twenty more stapling jobs

can be performed normally.

NOTE - Make sure that the staple strips on top of

the stack are complete and ﬂ at. Remove any partial

strips and any strips that are bent.

2. If the Cartridge is not low after checking with

your naked eyes, Check the Stapler Harness

connection

3. Check the Cartridge Set sensor’s operation.

4. Check the Main Board Harness connection.

5. If the same problem happens after checking 1~4,

replace the Finisher main board.

6. If the same problem happens after checking 5,

replace the Finisher Stapler.

7. If the same problem happens after checking 6,

replace the Finisher harnesses.

4. Alignment and Troubleshooting

Service Manual

ML-551x / 651x series

4-85 Samsung Electronics

 Code

H2-1A63

 Error message

Staple cartridge is empty. Replace it

 Symptom / Cause

Finisher doesn’t staple.

Staple Cartridge is not inserted Or Staples are in short supply. Or Stapler Harness connection not well. Or Cartridge

set sensor damaged, Or Main Board damaged.

 Troubleshooting method

1. Check if Cartridge exists.

2. Check if Cartridge is inserted ﬁ rmly.

3. Check if staples in cartridge are in some level.

- With such level like the below picture or

lower during POPO(Power off power on),

The sensor detects it “empty”.

NOTE - Make sure that the staple strips on top of

the stack are complete and ﬂ at. Remove any partial

strips and any strips that are bent.

4. Check the Stapler harness connection.

5. Check the Cartridge Set sensors’ operation.

6. Check the Main Board Harness Connection.

7. If the same problem happens after checking 1~6,

replace the Finisher main board.

8. If the same problem happens after checking 7,

replace the Finisher Stapler.

9. If the same problem happens after checking 8,

replace the Finisher harnesses.

4. Alignment and Troubleshooting

Service Manual

ML-551x / 651x series

4-86 Samsung Electronics

 Code

H2-4100

 Error message

Paper jam in front of mailbox. Remove paper

 Symptom / Cause

Paper doesn’t reach Mailbox’s Entrance Sensor.

Paper jam in IOT. Or Mailbox Lower Diverter operation not well. Or IOT Deﬂ ector Damaged. Or Mailbox Entrance

Sensor not working (Mailbox Entrance Sensor Damaged, Harness connection not well, MainBoard damaged)

 Troubleshooting method

1. Check Jam Occurrence in IOT.

2. Check IOT Deﬂ ector part’s operation.

3. Check Mailbox Main Board Harness connection.

4. Check Mailbox Entrance operation & harness

connection.

5. Refer to the Lower Diverter fault.

6. If the same problem happens after checking 1~5,

Replace the mailbox main board.

7. If the same problem happens after checking 6,

Replace the mailbox harnesses.

4. Alignment and Troubleshooting

Service Manual

ML-551x / 651x series

4-87 Samsung Electronics

 Code

H2-4101

 Error message

Paper jam inside of mailbox. Remove paper

 Symptom / Cause

Mailbox Entrance sensor actuator does not return after a paper covers it.

IOT Exit Roller grabs the paper. Or Mailbox Feeding Motor Stops. Or Mailbox Entrance Sensor damaged or

harness damaged. Or Mailbox Main Board damaged.

 Troubleshooting method

1. Check Jam Occurrence in IOT.

- If the IOT roller is grabbing the paper, it’s IOT

fault.

2. Check Mailbox Main Board Harness connection.

3. Check Mailbox Entrance operation & harness

connection.

4. Check Mailbox Feeding Motor Harness

connection and operation.

5. If the same problem happens after checking 1~4,

replace the mailbox main board.

6. If the same problem happens after checking 5,

replace the mailbox harnesses.

4. Alignment and Troubleshooting

Service Manual

ML-551x / 651x series

4-88 Samsung Electronics

 Code

H2-4102

 Error message

Paper jam inside of mailbox. Remove paper

 Symptom / Cause

Initialization started with Jammed paper covering Mailbox Entrance Sensor.

Paper exists covering Mailbox Entrance Sensor. Or Mailbox Entrance Sensor Damaged or harness connection not

well. Or Mailbox Main Board damaged.

 Troubleshooting method

1. Check if there is a jammed paper inside Mailbox.

2. Check Mailbox Main Board Harness connection.

3. Check Mailbox Entrance operation & harness

connection.

4. If the same problem happens after checking 1~3,

replace the mailbox main board.

5. If the same problem happens after checking 4,

replace the mailbox harnesses.

4. Alignment and Troubleshooting

Service Manual

ML-551x / 651x series

4-89 Samsung Electronics

 Code

H2-4200

 Error message

Paper jam in front of bin 1. Remove paper

 Symptom / Cause

Mailbox Bin 1 Exit Sensor doesn’t turn on after a paper entered Mailbox.

IOT Exit Roller grabs the paper. Or Mailbox Feeding Motor Stops. Or Mailbox Entrance Exit Sensor damaged or

Mailbox Gate doesn’t work or harness damaged. Or Mailbox Main Board damaged.

 Troubleshooting method

1. Check Jam Occurrence in IOT.

- If the IOT roller is grabbing the paper, it’s IOT

fault.

2. Check Mailbox Main Board Harness connection.

3. Check Mailbox Exit-related Sensors operation &

harness connection.

4. Check Mailbox Feeding Motor Harness

Connection and operation.

5. Referring to Upper Diverter Fault, check the

Upper Diverter’s operation.

6. Referring to Lower Diverter Fault, check the

Lower Diverter’s operation

7. If the same problem happens after checking 1~6,

replace the mailbox main board.

8. If the same problem happens after checking 7,

replace the mailbox harnesses.

4. Alignment and Troubleshooting

Service Manual

ML-551x / 651x series

4-90 Samsung Electronics

 Code

H2-4201

 Error message

Paper jam at mailbox bin 1. Remove paper

 Symptom / Cause

Mailbox Bin 1 Exit Sensor doesn’t turn off after the sensor turned on.

IOT Exit Roller grabs the paper. Or Mailbox Feeding Motor Stops. Or Mailbox Entrance Exit Sensor damaged or

Mailbox Gate doesn’t work or harness damaged. Or Mailbox Main Board damaged.

 Troubleshooting method

1. Check Jam Occurrence in IOT.

- If the IOT roller is grabbing the paper, it’s IOT

fault.

2. Check Mailbox Main Board Harness connection.

3. Check Mailbox Exit-related Sensors operation &

harness connection.

4. Check Mailbox Feeding Motor Harness

Connection and operation.

5. Referring to Upper Diverter Fault, check the

Upper Diverter’s operation.

6. Referring to Lower Diverter Fault, check the

Lower Diverter’s operation

7. If the same problem happens after checking 1~6,

replace the mailbox main board.

8. If the same problem happens after checking 7,

replace the mailbox harnesses.

4. Alignment and Troubleshooting

Service Manual

ML-551x / 651x series

4-91 Samsung Electronics

 Code

H2-4202

 Error message

Paper jam at mailbox bin 1. Remove paper

 Symptom / Cause

Initialization started with Jammed paper covering Mailbox Bin1 Exit Sensor.

Paper exists covering Mailbox Exit Sensor. Or Mailbox Exit Sensor Damaged or harness connection not well. Or

Mailbox Main Board damaged.

 Troubleshooting method

1. Check if there is a jammed paper on the feeding

path of Mailbox.

2. Check Mailbox Main Board Harness connection.

3. Check Mailbox Bin1 Exit-related sensors’

operation & harness connection.

4. If the same problem happens after checking 1~3,

replace the mailbox main board.

5. If the same problem happens after checking 4,

replace the mailbox harnesses.

4. Alignment and Troubleshooting

Service Manual

ML-551x / 651x series

4-92 Samsung Electronics

 Code

H2-4300

 Error message

Paper jam in front of bin 2. Remove paper

 Symptom / Cause

Mailbox Bin 2 Exit Sensor doesn’t turn on after a paper entered Mailbox.

IOT Exit Roller grabs the paper. Or Mailbox Feeding Motor Stops. Or Mailbox Entrance Exit Sensor damaged or

Mailbox Gate doesn’t work or harness damaged. Or Mailbox Main Board damaged.

 Troubleshooting method

1. Check Jam Occurrence in IOT.

- If the IOT roller is grabbing the paper, it’s IOT

fault.

2. Check Mailbox Main Board Harness connection.

3. Check Mailbox Exit-related Sensors operation &

harness connection.

4. Check Mailbox Feeding Motor Harness

Connection and operation.

5. Referring to Upper Diverter Fault, check the

Upper Diverter’s operation.

6. Referring to Lower Diverter Fault, check the

Lower Diverter’s operation

7. If the same problem happens after checking 1~6,

replace the mailbox main board.

8. If the same problem happens after checking 7,

replace the mailbox harnesses.

4. Alignment and Troubleshooting

Service Manual

ML-551x / 651x series

4-93 Samsung Electronics

 Code

H2-4301

 Error message

Paper jam in front of bin 2. Remove paper

 Symptom / Cause

Mailbox Bin 2 Exit Sensor doesn’t turn off after the sensor turned on.

IOT Exit Roller grabs the paper. Or Mailbox Feeding Motor Stops. Or Mailbox Entrance Exit Sensor damaged or

Mailbox Gate doesn’t work or harness damaged. Or Mailbox Main Board damaged.

 Troubleshooting method

1. Check Jam Occurrence in IOT.

- If the IOT roller is grabbing the paper, it’s IOT

fault.

2. Check Mailbox Main Board Harness connection.

3. Check Mailbox Exit-related Sensors operation &

harness connection.

4. Check Mailbox Feeding Motor Harness

Connection and operation.

5. Referring to Upper Diverter Fault, check the

Upper Diverter’s operation.

6. Referring to 12-945, 12-955 Check the Lower

Diverter’s operation

7. If the same problem happens after checking 1~6,

replace the mailbox main board.

8. If the same problem happens after checking 7,

replace the mailbox harnesses.

4. Alignment and Troubleshooting

Service Manual

ML-551x / 651x series

4-94 Samsung Electronics

 Code

H2-4302

 Error message

Paper jam at mailbox bin 2. Remove paper

 Symptom / Cause

Initialization started with Jammed paper covering Mailbox Bin2 Exit Sensor.

Paper exists covering Mailbox Exit Sensor. Or Mailbox Exit Sensor Damaged or harness connection not well. Or

Mailbox Main Board damaged.

 Troubleshooting method

1. Check if there is a jammed paper on the feeding

path of Mailbox.

2. Check Mailbox Main Board Harness connection.

3. Check Mailbox Bin2 Exit-related sensors’

operation & harness connection.

4. If the same problem happens after checking 1~3,

replace the mailbox main board.

5. If the same problem happens after checking 4,

replace the mailbox harnesses.

4. Alignment and Troubleshooting

Service Manual

ML-551x / 651x series

4-95 Samsung Electronics

 Code

H2-4400

 Error message

Paper jam in front of bin 3. Remove paper

 Symptom / Cause

Mailbox Bin 3 Exit Sensor doesn’t turn on after a paper entered Mailbox.

IOT Exit Roller grabs the paper. Or Mailbox Feeding Motor Stops. Or Mailbox Entrance Exit Sensor damaged or

Mailbox Gate doesn’t work or harness damaged. Or Mailbox Main Board damaged.

 Troubleshooting method

1. Check Jam Occurrence in IOT.

- If the IOT roller is grabbing the paper, it’s IOT

fault.

2. Check Mailbox Main Board Harness connection.

3. Check Mailbox Exit-related Sensors operation &

harness connection.

4. Check Mailbox Feeding Motor Harness

Connection and operation.

5. Referring to Upper Diverter Fault, check the

Upper Diverter’s operation.

6. Referring to Lower Diverter Fault, check the

Lower Diverter’s operation

7. If the same problem happens after checking 1~6,

replace the mailbox main board.

8. If the same problem happens after checking 7,

replace the mailbox harnesses.

4. Alignment and Troubleshooting

Service Manual

ML-551x / 651x series

4-96 Samsung Electronics

 Code

H2-4401

 Error message

Paper jam at mailbox bin 3. Remove paper

 Symptom / Cause

Mailbox Bin 3 Exit Sensor doesn’t turn off after the sensor turned on.

IOT Exit Roller grabs the paper. Or Mailbox Feeding Motor Stops. Or Mailbox Entrance Exit Sensor damaged or

Mailbox Gate doesn’t work or harness damaged. Or Mailbox Main Board damaged.

 Troubleshooting method

1. Check Jam Occurrence in IOT.

- If the IOT roller is grabbing the paper, it’s IOT

fault.

2. Check Mailbox Main Board Harness connection.

3. Check Mailbox Exit-related Sensors operation &

harness connection.

4. Check Mailbox Feeding Motor Harness

Connection and operation.

5. Referring to Upper Diverter Fault, check the

Upper Diverter’s operation.

6. Referring to Lower Diverter Fault, check the

Lower Diverter’s operation

7. If the same problem happens after checking 1~6,

replace the mailbox main board.

8. If the same problem happens after checking 7,

replace the mailbox harnesses.

4. Alignment and Troubleshooting

Service Manual

ML-551x / 651x series

4-97 Samsung Electronics

 Code

H2-4402

 Error message

Paper jam at mailbox bin 3. Remove paper

 Symptom / Cause

Initialization started with Jammed paper covering Mailbox Bin3 Exit Sensor.

Paper exists covering Mailbox Exit Sensor. Or Mailbox Exit Sensor Damaged or harness connection not well. Or

Mailbox Main Board damaged.

 Troubleshooting method

1. Check if there is a jammed paper on the feeding

path of Mailbox.

2. Check Mailbox Main Board Harness connection.

3. Check Mailbox Bin3 Exit-related sensors’

operation & harness connection.

4. If the same problem happens after checking 1~3,

replace the mailbox main board.

5. If the same problem happens after checking 4,

replace the mailbox harnesses.

4. Alignment and Troubleshooting

Service Manual

ML-551x / 651x series

4-98 Samsung Electronics

 Code

H2-4500

 Error message

Paper jam in front of bin 4. Remove paper

 Symptom / Cause

Mailbox Bin 4 Exit Sensor doesn’t turn on after a paper entered Mailbox.

IOT Exit Roller grabs the paper. Or Mailbox Feeding Motor Stops. Or Mailbox Entrance Exit Sensor damaged or

Mailbox Gate doesn’t work or harness damaged. Or Mailbox Main Board damaged.

 Troubleshooting method

1. Check Jam Occurrence in IOT.

- If the IOT roller is grabbing the paper, it is IOT

fault.

2. Check Mailbox Main Board Harness connection.

3. Check Mailbox Exit-related Sensors operation &

harness connection.

4. Check Mailbox Feeding Motor Harness

Connection and operation.

5. Referring to Upper Diverter Fault, check the

Upper Diverter’s operation.

6. Referring to Lower Diverter Fault, check the

Lower Diverter’s operation

7. If the same problem happens after checking 1~6,

replace the mailbox main board.

8. If the same problem happens after checking 7,

replace the mailbox harnesses.

4. Alignment and Troubleshooting

Service Manual

ML-551x / 651x series

4-99 Samsung Electronics

 Code

H2-4501

 Error message

Paper jam at mailbox bin 4. Remove paper

 Symptom / Cause

Mailbox Bin 4 Exit Sensor doesn’t turn off after the sensor turned on.

IOT Exit Roller grabs the paper. Or Mailbox Feeding Motor Stops. Or Mailbox Entrance Exit Sensor damaged or

Mailbox Gate doesn’t work or harness damaged. Or Mailbox Main Board damaged.

 Troubleshooting method

1. Check Jam Occurrence in IOT.

- If the IOT roller is grabbing the paper, it’s IOT

fault.

2. Check Mailbox Main Board Harness connection.

3. Check Mailbox Exit-related Sensors operation &

harness connection.

4. Check Mailbox Feeding Motor Harness

Connection and operation.

5. Referring to Upper Diverter Fault, check the

Upper Diverter’s operation.

6. Referring to Lower Diverter Fault, check the

Lower Diverter’s operation

7. If the same problem happens after checking 1~6,

replace the mailbox main board.

8. If the same problem happens after checking 7,

replace the mailbox harnesses.

4. Alignment and Troubleshooting

Service Manual

ML-551x / 651x series

4-100 Samsung Electronics

 Code

H2-4502

 Error message

Paper jam at mailbox bin 4. Remove paper

 Symptom / Cause

Initialization started with Jammed paper covering Mailbox Bin4 Exit Sensor.

Paper exists covering Mailbox Exit Sensor. Or Mailbox Exit Sensor Damaged or harness connection not well. Or

Mailbox Main Board damaged.

 Troubleshooting method

1. Check if there is a jammed paper on the feeding

path of Mailbox.

2. Check Mailbox Main Board Harness connection.

3. Check Mailbox Bin4 Exit-related sensors’

operation & harness connection.

4. If the same problem happens after checking 1~3,

replace the mailbox main board.

5. If the same problem happens after checking 4,

replace the mailbox harnesses.

4. Alignment and Troubleshooting

Service Manual

ML-551x / 651x series

4-101 Samsung Electronics

 Code

H2-4700

H2-4701

 Error message

Mailbox Failure: #H2-4700. Check mailbox.

Mailbox Failure: #H2-4701. Check mailbox.

 Symptom / Cause

Two Upper Gates seen when opening Rear Door is not operating well.

Upper Diverter Motor or Upper Diverter Sensor not assembled well or damaged. Harness Damaged. Main Board

damaged.

 Troubleshooting method

1. Check Upper Diverter Motor Harness connection.

2. Check Upper Diverter Sensor Harness

connection.

3. Check Mailbox Main Board Harness connection.

4. Check Upper Diverter operation.

5. Check Mailbox Gate operation.

6. If the same problem happens after checking 1~5,

replace the mailbox main board.

7. If the same problem happens after checking 6,

replace the mailbox harnesses.

4. Alignment and Troubleshooting

Service Manual

ML-551x / 651x series

4-102 Samsung Electronics

 Code

H2-4710

H2-4711

 Error message

Mailbox Failure: #H2-4710. Check mailbox.

Mailbox Failure: #H2-4711. Check mailbox.

 Symptom / Cause

The Lowest Gate seen when opening Rear Door is not operating well.

Lower Diverter Motor or Lower Diverter Sensor not assembled well or damaged. Harness Damaged. Main Board

damaged.

 Troubleshooting method

1. Check Lower Diverter Motor Harness connection.

2. Check Lower Diverter Sensor Harness

connection.

3. Check Mailbox Main Board Harness connection.

4. Check Lower Diverter operation.

5. Check Mailbox Gate operation.

6. If the same problem happens after checking 1~5,

replace the mailbox main board.

7. If the same problem happens after checking 6,

replace the mailbox harnesses.

4. Alignment and Troubleshooting

Service Manual

ML-551x / 651x series

4-103 Samsung Electronics

 Code

H2-4A20

 Error message

Mailbox door is open. Close it

 Symptom / Cause

Mailbox Motors doesn’t work.

Rear Door Opened, Micro Switch not assembled well or damaged, Harness Damaged. Main Board Damaged, door

ﬂ ag damaged.

 Troubleshooting method

1. Check the Rear Door Closed ﬁ rmly.

2. Check Mailbox Main Board Harness connection.

3. Check the Rear Door Switch Harness connection.

4. Check the Mailbox cover ﬂ ag damaged.

5. If the same problem happens after checking 1~4,

replace the mailbox main board.

6. If the same problem happens after checking 5,

replace the mailbox harnesses.

4. Alignment and Troubleshooting

Service Manual

ML-551x / 651x series

4-104 Samsung Electronics

 Code

H2-4A32

 Error message

Too much paper in mailbox bin 1. Remove printed paper

 Symptom / Cause

Mailbox bin 1 Full message pops when papers on that bin are stacked fully or the full sensor detecting mechanism

is out of order.

Mailbox Full detecting sensor damaged, harness connection not well or damaged, Main Board damaged.

 Troubleshooting method :

1. Check the Bin’s Full Sensor Connection and Actuator’s operation.

2. Check Main Board Harness connection.

3 . If the same problem happens after checking 1~2, replace the mailbox main board.

4. If the same problem happens after checking 3, replace the mailbox harnesses.

4. Alignment and Troubleshooting

Service Manual

ML-551x / 651x series

4-105 Samsung Electronics

 Code

H2-4A35

 Error message

Too much paper in mailbox bin 2. Remove printed paper

 Symptom / Cause

Mailbox bin 2 Full message pops when papers on that bin are stacked fully or the full sensor detecting mechanism

is out of order.

Mailbox Full detecting sensor damaged, harness connection not well or damaged, Main Board damaged.

 Troubleshooting method :

1. Check the Bin’s Full Sensor Connection and Actuator’s operation.

2. Check Main Board Harness connection.

3 . If the same problem happens after checking 1~2, replace the mailbox main board.

4. If the same problem happens after checking 3, replace the mailbox harnesses.

4. Alignment and Troubleshooting

Service Manual

ML-551x / 651x series

4-106 Samsung Electronics

 Code

H2-4A38

 Error message

Too much paper in mailbox bin 3. Remove printed paper

 Symptom / Cause

Mailbox bin 3 Full message pops when papers on that bin are stacked fully or the full sensor detecting mechanism

is out of order.

Mailbox Full detecting sensor damaged, harness connection not well or damaged, Main Board damaged.

 Troubleshooting method :

1. Check the Bin’s Full Sensor Connection and Actuator’s operation.

2. Check Main Board Harness connection.

3 . If the same problem happens after checking 1~2, replace the mailbox main board.

4. If the same problem happens after checking 3, replace the mailbox harnesses.

4. Alignment and Troubleshooting

Service Manual

ML-551x / 651x series

4-107 Samsung Electronics

 Code

H2-4A3C

 Error message

Too much paper in mailbox bin 4. Remove printed paper

 Symptom / Cause

Mailbox bin 4 Full message pops when papers on that bin are stacked fully or the full sensor detecting mechanism

is out of order.

Mailbox Full detecting sensor damaged, harness connection not well or damaged, Main Board damaged.

 Troubleshooting method :

1. Check the Bin’s Full Sensor Connection and Actuator’s operation..

2. Check Main Board Harness connection.

3 . If the same problem happens after checking 1~2, replace the mailbox main board.

4. If the same problem happens after checking 3, replace the mailbox harnesses.

4. Alignment and Troubleshooting

Service Manual

ML-551x / 651x series

4-108 Samsung Electronics

 Code

M1-1110

 Error message

Paper Jam in Tray 1

 Symptom / Cause

The jammed paper has occurred in the tray1.

1. Pick up/ Forward/ Retard roller is contaminated or worn out.

2. There is some obstacles in the paper path.

 Troubleshooting method

1. Clear the jammed paper. If the problem persists, check the following.

2. Check if the pick up/ forward/ retard roller is contaminated or worn out.

Clean or replace it if necessary.

3. Check if there is any obstacles or contamination in the paper path.

 Code

M1-1610

 Error message

Paper Jam in MP tray

 Symptom / Cause

The jammed paper has occurred in the MP tray.

1. MP Pick up/ Forward/ Retard roller is contaminated or worn out.

2. There is some obstacles in the paper path.

 Troubleshooting method

1. Clear the jammed paper. If the problem persists, check the following.

2. Check if the MP pick up/ forward/ retard roller is contaminated or worn out.

Clean or replace it if necessary.

3. Check if there is any obstacles or contamination in the paper path.

4. Alignment and Troubleshooting

Service Manual

ML-551x / 651x series

4-109 Samsung Electronics

 Code

M1-3122

 Error message

Tray1 cassette is pulled out. Insert it properly

 Symptom / Cause

Tray1 is not installed properly.

1. Tray1 is not installed.

2. Paper Size Sensor is defective.

3. Harness connection error.

 Troubleshooting method

1. Install the tray1.

2. Check if the paper size sensor is working properly.

3. Check if the harness is connected to the connector properly.

 Code

M1-4111

 Error message

Input System Failure: #M1-4111. Call for service

 Symptom / Cause

The paper has jammed in the path or can’t be fed.

1. Pick up error

2. Multi-feed error

3. Skewed or Wrinkled page

 Troubleshooting method

1. Check if the pick up/ forward/ retard roller is contaminated or worn out. Replace the defective

roller.

2. Check if each sensor is working properly.

3. Check if there is any jammed paper in the path. Remove it.

4. When loading the paper, adjust the paper guide.

4. Alignment and Troubleshooting

Service Manual

ML-551x / 651x series

4-110 Samsung Electronics

 Code

M1-5112

 Error message

Paper Empty in tray1

 Symptom / Cause

Paper is empty in Tray1. The status LED is red.

1. There is no paper in the tray1.

2. Actuator-Paper Empty is defective.

3. Photo Sensor is defective or connection is bad.

4. Engine Board is defective.

 Troubleshooting method

1. Load the paper in the tray1.

2. If the Actuator-Paper Empty is defective, replace it.

3. If the Photo Sensor is defective, replace it. Check if the connector is connected properly.

4. If the problem persists, replace the engine board.

 Code

M1-5612

 Error message

Paper Empty in MP

 Symptom / Cause

Paper is empty in Tray1. The status LED is red.

1. There is no paper in the MP tray.

2. Actuator-Paper Empty is defective.

3. Photo Sensor is defective or connection is bad.

4. Engine Board is defective.

 Troubleshooting method

1. Load the paper in the MP tray.

2. If the Actuator-Paper Empty is defective, replace it.

3. If the Photo Sensor is defective, replace it. Check if the connector is connected properly.

4. If the problem persists, replace the engine board.

4. Alignment and Troubleshooting

Service Manual

ML-551x / 651x series

4-111 Samsung Electronics

 Code

M2-1110

 Error message

Paper Jam in tray1

 Symptom / Cause

The paper has jammed at the feed sensor.

1. Feed sensor detection error.

2. The Regi. Roller is contaminated or worn out.

3. There is any obstacles in the path.

 Troubleshooting method

1. Check the level value of the feed sensor. Check the harness connection.

2. Check if the Regi. Roller is contaminated or worn out.

3. If there is any obstacles or contamination in the path, clean or remove it.

 Code

M2-2110

 Error message

Jam top of duplex

 Symptom / Cause

The paper did not enter the duplex path and has jammed.

1. The duplex unit is not installed.

2. There is any obstacles in the paper path.

3. The duplex motor is defective.

4. Paper size lever position error.

 Troubleshooting method

1. Check if the duplex unit is installed properly.

2. If there is any obstacles or contamination in the path, clean or remove it.

3. Check if the duplex motor is operated properly. If the duplex motor is defective, replace it.

4. If the paper size lever is placed on wrong position, adjust it.

4. Alignment and Troubleshooting

Service Manual

ML-551x / 651x series

4-112 Samsung Electronics

 Code

M2-2310

 Error message

Jam bottom of duplex

 Symptom / Cause

The paper has jammed in the duplex path.

1. There is any obstacles in the paper path.

2. The duplex motor is defective.

3. The duplex sensor is defective.

 Troubleshooting method

1. If there is any obstacles or contamination in the path, clean or remove it.

2. Check if the duplex motor is operated properly. If the duplex motor is defective, replace it.

3. Check if the duplex sensor is operated proerly. If the duplex sensor is defective, replace it.

 Code

M2-3120

 Error message

Install duplex unit.

 Symptom / Cause

The duplex unit is not installed properly.

1. The photo sensor for duplex unit is defective.

2. Harness connection error.

3. Duplex unit installation error.

 Troubleshooting method

1. Check if the photo sensor for duplex unit is operated properly.

2. Check if the harness is connected to the connector properly. Reconnect it.

3. Reinstall the duplex unit.

4. Alignment and Troubleshooting

Service Manual

ML-551x / 651x series

4-113 Samsung Electronics

 Code

M3-1110

 Error message

Jam in exit area

 Symptom / Cause

The paper has jammed in the exit path.

1. There is any obstacles in the paper path.

2. The exit motor is defective.

 Troubleshooting method

1. If there is any obstacles or contamination in the path, clean or remove it.

2. Check if the exit motor is operated properly. If the exit motor is defective, replace it.

 Code

M3-2130

 Error message

Output bin full. Remove printed paper

 Symptom / Cause

The paper is full on the output bin.

- The outbin full sensor is defective.

 Troubleshooting method

1. Remove the paper on the output bin.

2. Check if the sensor connector is connected properly.

4. Alignment and Troubleshooting

Service Manual

ML-551x / 651x series

4-114 Samsung Electronics

 Code

S2-4110

 Error message

Door is open. Close it

 Symptom / Cause

The top cover is closed but error message is not disappeared.

1. Harness connection error.

2. Micro Switch defect.

 Troubleshooting method

1. Check if the harness (Picture(1)-ᐭ) is normal.

2. Check if the harness is the connected to the Relay connector (Picture(1)-ᐮ) properly.

3. Check if the connector CN9 (Picture(1)-ᐯ) on the engine board is connected properly.

4. Open the cover of the OPE panel. Check if the UI message is changed when pushing the micro

switch (Picture(2)-ᐰ).

5. If the micro switch is defective, replace it.

4. Alignment and Troubleshooting

Service Manual

ML-551x / 651x series

4-115 Samsung Electronics

 Code

S2-4610

 Error message

Rear Door is open. Close it

 Symptom / Cause

The rear cover is closed but error message is not disappeared.

1. The rear cover is closed perfectly.

2. Relay connector pin is defective.

3. Harness connection error.

 Troubleshooting method

1. Check if the rear cover is closed perfectly.

2. Check the Relay connector Pin ᐭ. If it is defective, replace it.

3. Check the Relay connectorᐮ. If it is defective, replace it.

4. Remove the left cover. Check the harnessᐯ between the Joint board and Relay connector.

5. Check if the harness ᐰ is connected to the connector properly.

4. Alignment and Troubleshooting

Service Manual

ML-551x / 651x series

4-116 Samsung Electronics

 Code

S6-3123

 Error message

This IP address conﬂ icts with that of other system

 Symptom / Cause

IP address conﬂ icts with that of other system.

 Troubleshooting method

Change the machine’s IP address.

 Code

S6-3128

 Error message

802.1x Network Error Contact the Admin.

 Symptom / Cause

Can not get the authentication from server after setting up to 802.1x on SWS. Can not access to network.

 Troubleshooting method

Check if the Authentication method is selected properly.

Check if the User Name/Password is entered properly.

4. Alignment and Troubleshooting

Service Manual

ML-551x / 651x series

4-117 Samsung Electronics

 Code

U1-2115

 Error message

Fuser Unit Failure: #U1-2115. Turn off then on

 Symptom / Cause

The photo sensor is defective or some part is not assembled properly.

 Troubleshooting method

1. Remove the Rear Cover and Duplex Unit. Remove the fuser unit after removing 4 screws.

2. Remove the GUIDE-EXIT LOWER.

To remove it, ﬁ rst, push and release the green lever to the direction of arrow.

Then, lift and pull it.

4. Alignment and Troubleshooting

Service Manual

ML-551x / 651x series

4-118 Samsung Electronics

3. To remove the COVER-DUPELX,

a. Remove 1 screw. Lift up the COVER-DUPLEX PATH to the direction of arrow slightly.

b. Release the both hooks with the tweezers or (-) driver.

4. Remove the COVER-LEFT after removing 2 screws.

Remove the COVER-RIGHT after removing 2 screws.

4. Alignment and Troubleshooting

Service Manual

ML-551x / 651x series

4-119 Samsung Electronics

5. Check if the photo sensor connector from the COVER-RIGHT is connected properly.

6. Check if the left/right CAM and the ENCORDER are assembled properly.

7. If there is no problem for above steps, reassemble the fuser unit and turn the machine on.

8. If the error persists, download the ﬁ rmware again.

9. If the problem persists, replace the fuser unit with new one.

10. If the problem persists, replace the engine board.

4. Alignment and Troubleshooting

Service Manual

ML-551x / 651x series

4-120 Samsung Electronics

 Code

U1-2117

 Error message

Fuser Unit Failure: #U1-2117. Turn off then on

 Symptom / Cause

The photo sensor is defective or some part is not assembled properly.

 Troubleshooting method

1. Remove the Rear Cover and Duplex Unit. Remove the fuser unit after removing 4 screws.

2. Remove the GUIDE-EXIT LOWER.

To remove it, ﬁ rst, push and release the green lever to the direction of arrow.

Then, lift and pull it.

4. Alignment and Troubleshooting

Service Manual

ML-551x / 651x series

4-121 Samsung Electronics

3. To remove the COVER-DUPELX,

a. Remove 1 screw. Lift up the COVER-DUPLEX PATH to the direction of arrow slightly.

b. Release the both hooks with the tweezers or (-) driver.

4. Check if the fuser is assembled and fuser connector is connected properly.

5. If there is no problem for above steps, reassemble the fuser unit and turn the machine on.

6. If the error persists, execute the Memory Clear. (Note: Perform a backup ﬁ rst if necessary.)

7. If the problem persists, replace the fuser unit with new one.

8. If the problem persists, replace the engine board.

4. Alignment and Troubleshooting

Service Manual

ML-551x / 651x series

4-122 Samsung Electronics

 Code

U1-2320

 Error message

Fuser Unit Failure: #U1-2320. Turn off then on

 Symptom / Cause

The fuser unit is not installed or AC is not supplied to the Heat Lamp.

Thermistor is defective.

 Troubleshooting method

1. Check if the fuser unit is installed properly. Turn the machine off then on.

2. Remove the fuser unit. Remove the COVER-UPPER. And measure the thermostat continuity.

Check if the thermostat is opened.

3. Measure the LAMP-HALOGEN resistance value from the center and both sides.

Check if it has the continuity.

4. Alignment and Troubleshooting

Service Manual

ML-551x / 651x series

4-123 Samsung Electronics

4. Check if 2 thermistor connectors are connected properly.

5. Remove the thermistor. Check if the thermistor has curled as shown below. If there is any contamination on

the ﬁ lm, clean it.

Caution - Be careful not to be scratched or curled the ﬁ lm.

Deqrupdo QrupdoDeqrupdo Qrupdo

6. Check if the thermistor connector on the engine board is connected properly.

4. Alignment and Troubleshooting

Service Manual

ML-551x / 651x series

4-124 Samsung Electronics

7. Check if the FDB connector is connected properly.

8. Check if the voltage in user environment is in this range (80V ~ 140V, 160V ~ 260V).

9. Replace the FDB. If the problem persists, replace the engine board.

4. Alignment and Troubleshooting

Service Manual

ML-551x / 651x series

4-125 Samsung Electronics

 Code

U1-2330

 Error message

Fuser Unit Failure: #U1-2330. Turn off then on

 Symptom / Cause

Low Heat error has occurred.

The fuser unit can not reach the target temperature within normal time.

 Troubleshooting method

1. Check if the fuser unit is installed properly. Turn the machine off then on.

2. Remove the fuser unit after removing 4 screws.

3. Check if the fuser unit is overheated.

a. Remove the GUIDE-EXIT LOWER.

To remove it, ﬁ rst, push and release the green lever to the direction of arrow.

Then, lift and pull it.

4. Alignment and Troubleshooting

Service Manual

ML-551x / 651x series

4-126 Samsung Electronics

b. Rotate the gear to direction of arrow and check the surface of the Hear roller and Pressure

roller. If there is any overheated traces, replace the fuser unit.

c. Remove the COVER-UPPER. Check if the thermistor harness is connected properly and the

thermistor is defective.

4. Remove the thermistor. Check if the thermistor has curled as shown below. If there is any contamination on

the ﬁ lm, clean it.

Caution - Be careful not to be scratched or curled the ﬁ lm.

Deqrupdo QrupdoDeqrupdo Qrupdo

4. Alignment and Troubleshooting

Service Manual

ML-551x / 651x series

4-127 Samsung Electronics

5. Check if the center/side lamp is assembled properly.

a. To remove the COVER-DUPELX,

Remove 1 screw. Lift up the COVER-DUPLEX PATH to the direction of arrow slightly.

b. Release the both hooks with the tweezers or (-) driver.

c. Check if the lamp harness and harness are connected properly. (white-white , color-color)

4. Alignment and Troubleshooting

Service Manual

ML-551x / 651x series

4-128 Samsung Electronics

* Reassemble the fuser unit. Turn the machine off then on. If the problem persists, go to the next step.

6. Check if the thermistor connector on the engine board is connected properly.

7. Check if the FDB connector is connected properly.

8. If there is no problem, upgrade the latest ﬁ rmware.

4. Alignment and Troubleshooting

Service Manual

ML-551x / 651x series

4-129 Samsung Electronics

 Code

U1-2340

 Error message

Fuser Unit Failure: #U1-2340. Turn off then on

 Symptom / Cause

The overheat error has occurred.

 Troubleshooting method

1. Check if the fuser unit is installed properly. Turn the machine off then on.

2. Remove the fuser unit after removing 4 screws.

3. Check if the fuser unit is overheated.

a. Remove the GUIDE-EXIT LOWER.

To remove it, ﬁ rst, push and release the green lever to the direction of arrow.

Then, lift and pull it.

4. Alignment and Troubleshooting

Service Manual

ML-551x / 651x series

4-130 Samsung Electronics

b. Rotate the gear to direction of arrow and check the surface of the Hear roller and Pressure

roller. If there is any overheated traces, replace the fuser unit.

c. Remove the COVER-UPPER. Check if the thermistor harness is connected properly and the

thermistor is defective.

4. Remove the thermistor. Check if the thermistor has curled as shown below. If there is any contamination on

the ﬁ lm, clean it.

Caution - Be careful not to be scratched or curled the ﬁ lm.

Deqrupdo QrupdoDeqrupdo Qrupdo

4. Alignment and Troubleshooting

Service Manual

ML-551x / 651x series

4-131 Samsung Electronics

6. Measure the thermostat resistance. Check if the thermostat is opened.

Although the thermostat is opened, check the following steps. And then replace the fuser unit.

7. Remove the FDB cover. Check if the FDB Triac is short.

Check the resistance among 3 legs of both transistors. If it is short, replace the FDB.

8. If there is no problem for above steps, repalce the FDB, engine board step by step. If the fuser unit is

defective, replace it.

4. Alignment and Troubleshooting

Service Manual

ML-551x / 651x series

4-132 Samsung Electronics

 Code

U2-1111

 Error message

LSU Unit Failure: #U2-1111. Turn off then on

 Symptom / Cause

LSU motor does not work normally.

1. Harness connection error.

2. LSU is defective.

3. Main board is defective.

 Troubleshooting method

Check the followings.

1. Execute the LSU motor test in EDC mode. Check LSU motor operation sound.

2. If there is no sound, remove the right cover. Check if the C9 or C10 connector is connected

properly (Picture-ᐭ).

3. It it is OK, remove the top cover. Check if the LSU connector is connected properly.

(Picture-ᐮ).

4. Check if the LSU harness is defective. (Picture-ᐯ)

5. Reconnect the LSU harness and then execute the LSU motor test again.

6. Replace the LSU.

7. If the problem persists, replace the main board.

4. Alignment and Troubleshooting

Service Manual

ML-551x / 651x series

4-133 Samsung Electronics

 Code

U2-1113

 Error message

LSU Unit Failure: #U2-1113. Turn off then on

 Symptom / Cause

LSU LD(Laser Beam Detect) signal is abnormal.

1. Harness connection error.

2. LSU is defective.

3. Main board is defective.

4. Engine board is defective.

 Troubleshooting method

1. Check if the C9 or C10 connector on the main board is connected properly.

2. Check if the LSU harness is defective.

3. Check if the LSU connector is connected properly. Reconnect it.

4. Turn the machine off then on.

5. If the problem persists, replace the LSU.

6. If the problem persists after replacing the LSU, remove the main board.

7. If the problem persists after replacing the main board, remove the engine board.

8. If you have the DVM, measure the voltage level for LD optical power control before step 5.

If it is normal, the value is between 0.6V~2.0V.

If the value is less than 0.5V, check the FFC cable between engine and main board.

Replace the FFC cable.

00 Cover_ML 551x_651x SF 4700 Ml 5510 6510 Error Codes

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