5957 6567_3.5_Inch_Flexible_Disc_Drive_Mechanism_Sep85 6567 3.5 Inch Flexible Disc Drive Mechanism Sep85

User Manual: 5957-6567_3.5_Inch_Flexible_Disc_Drive_Mechanism_Sep85

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31/2-INCH
FLEXIBLE DISC DRIVE
MECHANISM

TOPIC
Introduction.
Specifications
Configuration.
Troubleshooting Procedures.
Load Pad Assembly Replacement.
Replaceable Parts . . . • . . . . .

Part No. 5957-6567
For use with binder No. 9282-0683

PAGE
1-1
1-1

1-2
1-4

1-5
1-5
Printed in USA
September. 1985

3 1/2-inch Flexible
Disc Drive Mechanism

Reference

INTRODUCTION
The 3 1/2-inch Flexible Disc Drive is a random-access drive.
available in both single-and dual-head configurations. The
single-head version is used 1n the HP 9121D/S and HP 9133 A/B/V/XV
products. The dual-head drive is used in the 3 1/2-inch products:
HP 9133D/H. HP 9122D/S. HP 9114A and HP 9153A.

SPECIFICA TIONS
Single-Sided
Dimensions
Net Weight
Height
Depth
Width
Format
Surfaces used per disc
Encoding
Rotational speed
Track density
Tracks/surface
Capacity
Bytes/sector
Sectors/track
Tracks
Bytes/drive (Formatted)

Double-Sided
650g
51mm
130mm
102mm

(1.5
(2.0
(5.1
(4.0

lbs)
in)
1n)
1n. )
2

MFM
600 RPM
135 tracks per inch
70

80

SEE SPECIFIC PRODUCT SECTION

DC Voltage Requirements
+12V ± 5% @ 0.4A typical
+ 5V ± 5% @ 0.6A typical
Power Dissipation
7.5 Watts continuous
3.3 Watts standby

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Reference

3 1/2-inch Flexible
Disc Drive Mechanism

Operating Limits
Temperature

10 to 40°C

Humidity

20 to 80% with maximum wet bulb
temperature (non-condensing) not
to exceed 29°C (85°F).

Altitude

o to

(50 to 104°F)

4600 m (0 to 15,000 ft)

Non-operatingLimits (storage and transit)
Temperature

-40 to 60°C (-40 to 140°F)

AU itude

-304 to 15240 m (-1000 to 50,000 ft)

CONFIGURA TION
UNIT SELECT SWITCH CONFIGURATION
The drive mechanism has 2 switches to configure: the Unit Select
SWitch, and the Motor-Control Switch.
The Unit Select Switch position will vary with the product and
drive unit number. Use Figures 1 and 2 for location and proper
setting of these switches.

1-2

3 1/2-inch Flexible
Disc Drive Mechanism

Reference

OA-Q3OV-l

OA-D31V-11D31V-14

QA.-D32W-l0 or 11

Early Version Single-Sided

Later Version Single-Sided

Double-Sided

Switch 1

2

913'JVfXV

closed

open

91215

closed

open

position 0

o

9121D
Drive 0

closed

1

9114A
91225
9122D

2

3
Drive 0

1

1
9133D/H
9153A

4
4

4

Figure 1.

Unit Select Switch Configuration.

MOTOR-CONTROL SWITCH CONFIGURATION

The Motor-Control switch determines the following: in one
position, the motor is turned on when accessed, ONLY when a disc
is in the drive; in the other, the motor turns on, momentarily,
with or without a disc installed. All HP 3 1/2-inch drive
products use the second position (motor-on with or without a disc)
to check the index pulses generated by the motor.
Refer to Figure 2 in the following explaination of the switches
and jumpers.
Position IIAN of the
Position "1" of the
Position IIBII of the
Position 11211 of the

swi tch
jumper
switch
jumper

.

motor on only when a disc is in the
drive.
motor tu rns on, momentarily, with or
without disc in the drive.

1-3

Reference

3 1/2-inch Flexible
Disc Drive Mechanism

OA-D30V-1
Early Single-Sided

Figure 2.

OA-D31V-1/D31V-14
Later Single-Sided

OA-D32W-10 or 11
Double-Sided

Motor-Control Switch Configuration.

TROUBLESHOOTING PROCEDURES
Field repairs of the 3 1/2-inch mechanism are limited to head
cleaning, load pad replacement, and complete unit (mechanism and
Drive Electronics PCA) replacement.
The troubleshooting procedure is as follows:
1. For initial problem isolation, see the appropriate
product-numbered tab.
2. When READ/WRITE problems occur with a particular drive:
first clean the head(s) with the cleaning disc; replace the
load pad on single-sided drives (see "LOAD PAD ASSEMBLY
REPLACEMENT" for this information).

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3 1/2-inch Flexible
Disc Drive Mechanism

Reference

3. When SEEK or HEAD-POSITION problems occur on a particular
drive, replace the drive mechanism.

LOAD PAD ASSEMBLY REPLACEMENT
A new load pad (09121-88877) comes with an attached plastic
mounting tab. If replacement of the load pad on an early version
(OA-D30V-1) drive is necessary, replace the drive assembly. The
older pad is not available.
Verify drive operation. If read errors occur, rotate the pad
assembly 90 degrees with a small screwdriver and test again.

REPLACEABLE PARTS
Exchange Assemblies
09121-69521
09114-69511

3 1/2-inch Drive AssemblY (single)
3 1/2-inch Drive Assembly (double)

Non-Exchange Assemblies
09121-88877

Load Pad AssemblY

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