DN138 01v04_AssemblyGuide User Manual 138 New S

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Soldering Hints

DSO 138 Oscilloscope DIY Kit

User Manual

1 Put leads through mounting holes from the side with
part outline. Ensue component evenly touch PCB.
2 Solder leads at the other side. Solder should fully
fill and cover soldering pads.
Avoid bridges between
neighbering pads.
3 Cut unused leads
flush with cutter.

Before you start

Tools you need
4 Screw driver

1 Iron (20W)
2 Solder wire
3 Multimeter

5 Flush cutter
6 Tweezers

Step 1 Assembly Main Board and LCD board (follow the order as numbered)
1. Resistors

5. USB Socket *
Note:

Important !!!
Install all SMD parts before proceeding
to Step1 if you purchased kit 13804K.

This connector is
optional.

J9

R9, R15, R26 : 1K

R2

: 1.8M

R10

: 3K

R3

: 200K

R11

: 150

R4

: 2M

R38

: 1.5K

R5

: 20K

R28, R40

: 470

R6

: 300

R37, R39

: 10K

2. HF-Chokes

SW4, SW5, : 6 X 6 X 5mm
SW6, SW7,
SW8

: 100H

3. Diodes
Cathode
D1

: 1N5819

D2

: 1N4004
(or 1N4007)

C1, C9,
C10, C11,
C14, C15,
C16, C17,
C18, C20,
C23

: 0.1F

J5
J6
Q1

: 8550

Q2

: 9014

Attention!

Packages are similar.
Do not mix up!

U4

: 79L05

U5

: 78L05

Packages are similar.
Do not mix up!

C2

: 330pF

C7, C8

: 120pF

C3

: 3pF

C12, C13

: 22pF

C5

: 1pF

12. Capacitor trimmers
C4, C6

8. LED

: 5 - 30pF

These pin-headers are
optional.

17. Pin-header (female)

J7, J8

: 1 X 2 pin

J3

: 2 X 20 pin

18. Slide switches
SW1, SW2,
SW3

J1

JYE Tech Ltd.

- www.jyetech.com -

Solder positive pole
(the longer lead) to
the square pad

D3

: 1 X 4 pin

:3mm, green

L2

: 2P3T

19. BNC connector

13. Power inductor
: 8MHz

: 1 X 3 pin

Note:

Attention!

4. Crystal
Y1

: DC005

J10

11. Regulators

7. Ceramic Capacitors
L1,L3,L4

15. Power connector

16. Pin-header (male) *
10. Transistors

6. Tact Switches

C19, C21, : 100F / 1 6 V
C22, C24,
C25, C26

: 2 Pin

R8, R12, R13 : 120
R1, R14, R16 : 100K

Solder positive pole
(the longer lead) to
the square pad

Face the opening
outward

: USB mini - B

Note:

: 180

R7, R36

1 Check part values & quantities against part list
2 Always meter resistor values before soldering
3 Understand all part polarities and orientations

9. Pin header (for power)
J4

Always meter resistor
values before soldering

14. Electrolytic capacitors

Rev. 04
Applicable models: 13803K, 13804K

: 1mH/0.5A

: BNC

Note:
The thicker pins need
to heat up longer to get
good soldering result.

Page 1

20. Test signal ring

21. JP3

22. LCD Board

1 ) Make a small ring with a
lead cut-off.

Note: Install to the side
opposite to LCD panel.

Short JP3 with solder

2 ) Solder the ring to the two
holes of J2 (as shown in
the photo).

Step 2 Test and Use
A. Check voltages

B. Attach LCD board
Plug LCD board into the female headers J3, J7, and J8
on the main board.

: 2 X 20 pin

J2, J3

: 1 X 2 pin

The assembly should look like this
after you have finished all parts

NOTE: You need a 9V DC power supply (at least 200mA capacity)
to run the scope. This power supply is not included in the kit.

1 Apply 9V power to J10 (or J9).
2 Check voltage at TP22. It should be around +3.3V.
3 If voltage at TP22 is good disconnect power. Short JP4
with solder permanently .
1

J1

C. Verify

A. Use

1 Connect power supply again. You should see LCD
lights up and oscilloscope panel displayed.
2 Press various buttons and move switches to verify
their functions.

1 Attach probe clips to J1.
2 Touch the red clip with your finger. Do you see signal
from your finger?
1

2
2

Trigger LED blinking twice
indicates booting-up is good.

3

Troubleshooting
LCD Dark

No Display

(No backlight)
Is voltage at V+
good?

No Check power

Yes
Is R36 value correct
and soldered good?

Short JP4 if it has not been
done. See Step 2 above.

supply

No

Press SW8. Does LED blink?

Fix R36

Yes

Yes

Check J3 soldering for
possible opens or shorts
Check J1 soldering on LCD
board for possible opens
or shorts (use Test Mode)

Do you get about 3V No
Check R36 and
between J1 pin 16 &
power again
18 on LCD board?

Yes
Check LCD
board

No Trace
Are the values of AV+ and
AV- correct?

No

Visit forum for detailed
troubleshooting guide

Yes

Set CPL switch to GND No Check U2B, U2C and
and measure V1 and V2.
related parts around
Are they correct?
these two amplifiers

Yes
Check R12 and C8

JYE Tech Ltd.

- www.jyetech.com -

NOTE 1: The voltages in the photo are for reference only.
The voltages on your board could be different.
But they should be close to the values shown.
NOTE 2:
LED will be blinking constantly if MCU
(U1) can not detect valid LCD controller.
Check LCD pin-header soldering.

No

Check +3.3V voltage
Check Y1, C12, C13
Check LED installation

Test Mode

NOTE 3:
Make sure U1 and LED working
(you see LED blinks twice at pressing
RESET) before using Test Mode.

What it is and how it works

-5.0V

4.99V

3.3V

*
-8.08V*

-8.11V

PIN 1

Test Mode is used to find out possible opens (for all port pins) and shorts
(for pins PB0 - 15 and PC13-15). When entered it first checks PB and PC
pins with special patterns to find out possible shorts. If found LED will be
fast blinking. Otherwise, it generate 3.3V and 0V alternatively at each port
pins (PA, PB, PC and PD) in cycle of about 4 seconds. These signals can be
used to check for opens.

Voltage
References

5.02V

*

0.19V

* 9.39V *(Input Voltage)

6.43V

8.60V

*

3.3V

8.34V

*

-1.39V
2.16V
0.81V

How to use

1. Hold down SW4 and press RESET to enter Test Mode.
2. If you see LED fast blinking that means there are shorts on PB or PC pins.
** 1.66V **
You need to find out the shorts first.
0V
3. If you see LED slowly blinking use a volt-meter to check each pin related
connections that are suspected open. When you dont see voltage change
Place the negative pen of volt-meter
at a spot which is supposed being connected to a port pin there may be
here to do voltage measurements.
open between the spot and the port pin.

Tech Support: www.jyetech.com/forum

NOTES:
*: These voltages are input voltage dependent. The values
shown were measured when input voltage was 9.39V.

**: These voltages are measured when CPL switch (SW1)
is set to GND position.

Page 2

How to Use

Probe Calibration
Because there is always some capacitance between scope input and
ground probe needs to be calibrated to achieve better measurement
results for high frequency signals. This can be done with the help of
the built-in test signal. To do this please follow the steps below.

Display and Controls
Trigger Level
Readout
Oscilloscope
Mode

Connector
for Probe

Connectors
for Power Supply

Horizontal
Position

[OK]:
HOLD / RUN
Selection
[+] or [-]:
Parameter
Adjustment

[CPL]:
Couple
Selection

[SEN1]:
Sensitivity
Selection 1

Leave black clip
un-connected

Connect red clip to
test signal output

1. Connect the red clip to the test signal terminal and leave the
black clip un-connected (see photo at right).
2. Set [SEN1] switch to 0.1V and [SEN2] switch to X5.
Set [CPL] switch to AC or DC.
C6
3. Adjust timebase to 0.2ms. You should see waveform similar
to that shown in photos below. If traces are not stable adjust
C4
trigger level (the pink triangle on right screen border) so as
you get a stable display.
4. Turn C4 (capacitor trimmer) with a small screw driver so that
the waveform displays sharp rightangle (photo C).
5. Set [SEN1] switch to 1V and [SEN2] switch to X1while keep all other
settings unchanged. Adjust C6 so that sharp rightangle waveform is
displayed.

[SEL]:
Parameter
Selection

[SEN2]:
Sensitivity
Selection 2

Trigger
Level
Indicator

Vertical
Position
Indicator

Timebase
(s/div)

Sensitivity
(V/div)

Couple

Trigger
Slope

Trigged
Indicator

Reset
Button

Trigger
Mode

A  Not enough

C  Good

B  Too much

Turn On/Off Readouts
Press [SEL] so that timebase is highlighted. Hold down [OK] button for about 2 seconds. This will turn
on/off measurement readouts.

Waveform Save/Recall

Connections
Power Supply:

Connect DC power supply to J9 or J10. The power
supply voltage must be in the range of 8 - 12V.

Probe:

Connect probe to J1.

Atte ntion
1. Power supply voltage must not exceed
12V. Otherwise U5 will get hot.
2. Allowed maximum signal input voltage
is 50Vpk (100Vpp) with the clip probe.

Operations
Press on [SEL] button: Select parameter to be adjusted. The selected parameter will be highlighted.
Press on [+] or [-] button: Adjust the parameter selected by [SEL] button.
Press on [OK] button: Freeze waveform refresh (entering HOLD state). Press on it again will de-freeze.
Change [CPL] switch: Set couple to DC, AC, or GND. When GND is selected the scope input is isolated from input
signal and connected to ground (0V input).

Change [SEN1] or [SEN2] switch:
Press on [Reset] button:

Adjust sensitivity. The product of [SEN1] and [SEN2] settings makes the
actual sensitivity which is displayed at the lower-left corner of the panel.

Perform a system reset and re-boots the oscillscope.

0V Line Alignment
Sometimes you may find the 0V line (the trace corresponding to 0V input voltage) does not match with the VPOS
indicator at the screen left border. This can easily be fixed by performing the 0V line alignment function. First,
set the couple switch [CPL] to GND position. Then press on [SEL] button to make VPOS indicator highlighed and
hold down [OK] button for about 2 seconds. You will set the trace aligned to VPOS indicator when you release
[OK] button. You may see some residue mismatch remains at the highest sensitivity settings. This is normal.

JYE Tech Ltd.

- www.jyetech.com -

Press [SEL] & [+] simultaneously: Save currently displayed waveform to non-volatile memory.
Press [SEL] & [-] simultaneously: Recall saved waveform

Triggers and Their Modes
Triggers are events that indicate signal voltage acrossing
a set level (i.e. trigger level) along a specified direction
(i.e. trigger slope, rising or falling). Oscilloscope uses
triggers as reference points in time for stable waveform
display and measurements.

Au to Mode
In auto mode oscilloscope will perform display refresh no
matter triggers happen or not. When triggers are detected
waveform display will be displayed with reference to
trigger points. Otherwise, display waveform at ramdom
reference points.
Normal Mode
In normal mode oscilloscope will only perform display
refresh when there are triggers. If no triggers happen
waveform display will stay unchanged.
Single M ode
Single mode is the same as normal mode except that
oscilloscope will enter HOLD state after a trigger has been
detected and waveform display has been updated.
Normal and single modes are useful for capturing sparse
or single waveform.

Specifications
Max realtime sample rate
Analog bandwidth
Sensitivity range
Max input voltage
Input impedance
Resolution
Record length
Timebase range
Trigger modes
Trigger position range
Power supply
Current consumption
Dimension
Weight

1MSa/s
0 -- 200KHz
10mV/div - 5V/div
50Vpk (1X probe)
1M ohm/20pF
12 bits
1024 points
500s/Div -- 10us/Div
Auto, Normal, and Single
50%
9V DC (8  12V)
~120mA
117 x 76 x 15mm
70 gram (without probe)

Tech Support: www.jyetech.com/forum

JYT Tech Ltd.
Tel. +86-0773-2113856

www.jyetech.com

Page 3

5

4

CPL

AIN

**

TP1
J1
BNC

SW1A

DC 1
C1

AC 3

0.1u

C2

2

GND 4

SEN1

R1

100K

10mV

1

C3

3pF

0.1V

3

1V

4

AV+

U2A
TL084/SO

+

2

-

C6

R5

30pF

20K 1%

10K

R21

3.3K

-

R9

3K

VSENSEL1

6

R15

R14

SW3B
6

7
3.3K

VSENSEL2

TP8

R13
120

R25
1.5K

8

USB

Buttons
USBDM
USBDP

12

+

13

-

C10

U2D
TL084/SO

C11

C9
Trigg er
Level

AV-

0.1u

+

BTN2

J2

J6

1
2

+3.3V

10K

1
2
3
4

9.3V

8.6V

A

D2
1N4004

J10
1
3
2

+
-

VOUT
VOUT

2
4

GND

1

+

LM1117 -3.3/TO263

*
V+

TP20

10K

TESTSIG
R26

1K

100uF

+5V

U5
3

C19 +

2

*

JP4

C22
100uF

+3.3V

1

VIN

VOUT

1

GND
LM78L05/T92

*

5V
AV+

C20
0.1u

C21
100uF

+
TP27 TP28 TP29 TP30

DC 9V

-8.1V
D1

2

8.3V

R37
10K

TP24

0.2V
3

*

3.3V

*

*

Q1
8550

8.6V

V+
TP23

*
L3
100uH

JYE Tech Ltd.

4

- www.jyetech.com -

C24

L1
100uH
C25
100uF

100uF

R38
1.5K

IN

OUT

3

-5V

*

AV-

U4
79L05/TO92

C13
22pF

JP1

+3.3V
BOOT0

44

R27

D

1K
TP10
C14

VSSA

C15
0.1u

24
36
48

PC13/TEMPER/RTC VSS_1
PC14/OSC32_IN
VSS_2
PC15/OSC32_OUT VSS_3

23
35
47

L4 100uH
+3.3V
+ C26
100uF

8

VDD_1
VDD_2
VDD_3

SW8

0.1u

+3.3V

+3.3V

C

C16

C17

C18

0.1u

0.1u

0.1u

R28

D3

470

+3.3V

VGEN

2
C23
R39 0.1u
10K

R40

470
0.8V

+3.3V

R41

10K

R42

1K

These voltages are power voltage dependent. The
values shown were measured at 9.3V power voltage.
3

J7

J8

1
2

1
2

1
3
5
7
9
11
13
15
17
19
21
23
25
27
29
31
33
35
37
39

2
4
6
8
10
12
14
16
18
20
22
24
26
28
30
32
34
36
38
40

LCD_RS
LCD_nRD

+3.3V
B

LED-A
LED-K2
LED-K4
DB1
DB3
DB5
DB7

V+
R36
180

+3.3V

LCD HEADER

Notes:
1. Part values used could be different to

the values shown. Please refer to part
list.
2. Parts in dash-line boxes are SMD devices.

-1.4V

6.4V
Q2
9014

2

1N5819
L2
1mH/1A

TP26

TP25 V-

1

*
5

9

LED-K1
LED-K3
IM3
DB0
DB2
DB4
DB6
LCD_nRESET

JP6
R35

+

1
2

VDDA

JP5

SWDIO
SWCLK

+

J9

+
-

TP22

U3
VIN

1

LCD_nCS
LCD_nWR
IM0

+3.3V

3

VBAT

22pF

J3

R34

BTN4

Test Signal Terminal

TP16
TP17

TP21

PB0
PB1
PB2
PB3
PB4
PB5
PB6
PB7
PB8
PB9
PB10
PB11
PB12
PB13
PB14
PB15

LED

+3.3V

J5

Caution:
Power supply voltage can
not be higher than 12V.

7

USE SWD DEBUG
MODE ONLY

SW7

Power Supply

nRST

Y1
8MHZ
PD0/OSC_IN 5

LCD Module Connector

BTN3

SEL

RX1
TX1

PD1/OSC_OUT

STM32F103Cx

R16
100K

SWD Port

BTN1

2
3
4

C12
6

PA0
PA1
PA2
PA3
PA4
PA5
PA6
PA7
PA8
PA9
PA10
PA11
PA12
PA13
PA14
PA15

SW4

-

1K
1K

LCD_nCS
LCD_RS
LCD_nWR

AV-

TP5

SW5

R32
R33

14

TLVL

OK

TP14
TP15

B

1
2
3

TP4

AV+

SW6

Uart

18
19
20
39
40
41
42
43
TL_PWM
45
VGEN
46
LCD_nRD
21
LCD_nRESET 22
BTN4
25
BTN3
26
BTN2
27
BTN1
28

V3

100K

DB0
DB1
DB2
DB3
DB4
DB5
DB6
DB7

JP2

TP7

R22
1.5K

5

TP6

R31 1.5K
22
22

AV-

1K

8

10K

R24

R29
R30

120pF

R11

0.1u

VBUS
DD+
ID
GND

C8

1K

R10

Analog Channel
TP33

R12
120
AV-

JP3

1
2
3
4
5

TP3
8

R7

0.1u

J4 USB_mini_B

10
VSENSEL2 11
VSENSEL1 12
CPLSEL
13
TP11
14
TP12
15
TP13
V-MON 16
TESTSIG 17
TRIG
29
TX1
30
RX1
31
USBDM
32
USBDP
33
SWDIO 34
SWCLK 37
LED
38

AV+
R23

R19
1.5K

8

+

9

SW2B

5

3.3K

10

AV+

5
CPLSEL

2

4

120

C7
120pF
6

X5

AV+
R20

TP9
U1

ADCIN

1.6V

V2

R8

1pF

SW1B

X2 3

300
7

7

7
R18

-

1

AV+

C

6

R6

**

AV+

U2C
TL084/SO

SW3A

1

AV-

AV-

10K

+

30pF
C5

X1

180

R4 2M 1%

R17

5

R3
200K 1%

C4
3

SW2A
2

1

MCU
SEN2

AV+

U2B
TL084/SO

2

**

0V

V1
TP2

220pF

R2 1.8M 1%

D

3

These voltages were measured
when SW1 is at GND position.

V-MON

JYE Tech Ltd.
WWW.JYETECH.COM

TP31
TP32

jyetek@ gmail.com

2

1

Page 4

A



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