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Service Hints & Tips |
Document ID: GSMH-38GBVN |
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IBM PS/2 - Power supply test for models 35, 40 , 56, 57, 76, 77
Applicable to: World-Wide
Service Information:
Page number 60 of the PS/2 hardware maintenance manual, form number S52G-9971-00 dated September 1992, contains errors in the Pin/Voltage Diagrams. This tip provides correct Pin/Voltage diagrams and clarifies testing instructions.
Models 35, 40, 56, 57, 76, 77
1. Disconnect the power cord from the power supply. Place the On/Off switch in the 'On' position. Check for continuity between Pins 4 and 6 (switch) on P2 of the power supply.
1 4
-------------------
P1 | | |__| | |
------------------
------------------------------------------------
| -LEAD | +LEAD | V DC | V DC |
P1 | PIN | PIN | MIN | MAX |
|------------|------------|-----------|--------- |
| 3,4 | 1,2 | +3.75 | +6.25 |
------------------------------------------------
7 1
---------------------
P2 | o o o o o o o |
x------------------x
P2
------------------------------------------------
| -LEAD | +LEAD | V DC | V DC |
| PIN | PIN | MIN | MAX |
|-----------|------------|-----------|----------|
| 6 | 1,2 | +9.0 | +15.0 |
|-----------|------------|-----------|----------|
| 6 | 5 | -9.0 | -15.0 |
|-----------|---------- -|-----------|----------|
| 6 | 7 | -4.75 | -5.5 |
-----------------------------------------------
DRIVE CONNECTORS 1 THROUGH 4:
1 4
/------------\
| o o o o |
--------------
------------------------------------------------
| -LEAD | +LEAD | V DC | V DC |
| PIN | PIN | MIN | MAX |
|-----------|------------|-----------|----------|
| 2,3 | 1 | +9.0 | +15.0 |
|-----------|------------|-----------|----------|
| 2,3 | 4 | +3.75 | +6.25 |
------------------------------------------------
If the voltages are not correct, replace the power supply. If the voltages are correct, continue problem determination with the HMM.
Note:
These corrections will be made in the next release of the HMM.
SAS KEYWORDS:
PSY2 PSY2POWR PSY2DOC D/T8550 D/T8535 D/T8540 D/T8556 D/T8557 D/T9556 D/T9557 D/T9576 D/T9577
PSY2PWR
Search Keywords |
| |
Hint Category |
Retain, Power | |
Date Created |
01-02-93 | |
Last Updated |
01-05-98 | |
Revision Date |
27-04-99 | |
Brand |
IBM PC | |
Product Family |
PS/2 | |
Machine Type |
8540, 9556, 9557, 9576, 9577, 8535, 8550, 8556, 8557 | |
Model |
various | |
TypeModel |
| |
Retain Tip (if applicable) |
H067810 | |
Reverse Doclinks |