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Service Hints & Tips |
Document ID: GSMH-3D7D8B |
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This document is provided to IBM and our Business Partners to help sell and/or service IBM products. It is not to be distributed beyond that audience or used for any other purpose. |
TP 3550 Expansion Unit - Power Systems Checkout
Applicable to: World-Wide
Power Systems Checkout:
If the ¿power good— light is not on and if the power-supply fan is not running, check the power cord for continuity and proper
installation. If the power cord is not the problem, either the power supply is defective or another component is defective and is causing the power supply to shut off.
To verify that the power supply is operating correctly, do the following:
1. Power-off the 3550 Expansion Unit and disconnect the 3550 Expansion Unit power cord.
2. Remove all power supply connectors (power supply connector P1, P2 and drive connector 1) from the system board of the 3550 Expansion Unit and SCSI device.
3. On power supply connector P2, short-circuit pin 4 to pin 6 and short-circuit pin 7 to 8.
4. Connect the 3550 Expansion Unit power cord.
5. Check the power supply voltages using the figures on the next page.
Drive Connector 1:
|
Pin |
Signal |
V dc Min. |
V dc Max. |
|
1 |
+ 12 volts |
+ 11.52 |
+ 12.6 |
|
2,3 |
Ground | ||
|
4 |
+5 volts |
+ 4.8 |
+ 5.25 |
If any of the voltages are not correct, replace the power supply.
If all voltages are correct, the power supply is working properly. Another 3550 Expansion Unit component might be causing the power supply to shut off. Return to the procedure that sent you here and continue. (If you have completed that procedure, go to ¿Undetermined Problem—.)
Power Supply Connector P1:
|
Pin |
Signal |
V dc Min. |
V dc Max. |
|
1, 2, 3, 4 |
+5 volts |
+ 4.8 |
+ 5.25 |
|
5, 6, 7, 8, 10 |
Ground | ||
|
9 |
+ 20 volts |
+ 19.0 |
+ 21.0 |
Power Supply Connector P2:
|
Pin |
Signal |
V dc Min. |
V dc Max. |
|
1,2 |
+ 12 volts |
+ 11.52 |
+ 12.6 |
|
3 |
Power |
+ 4.0 |
+ 5.25 |
|
4 |
On/Off | ||
|
5- 12 |
volts |
- 10.92 |
- 13.2 |
|
6,7 |
Ground | ||
|
8 |
Global Signal |
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Search Keywords |
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Hint Category |
Hardware Maintenance Information, Power | |
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Date Created |
10-01-97 | |
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Last Updated |
07-04-98 | |
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Revision Date |
06-04-99 | |
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Brand |
IBM ThinkPad | |
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Product Family |
ThinkPad Docking Stations | |
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Machine Type |
3550 | |
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Model |
001 | |
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TypeModel |
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Retain Tip (if applicable) |
N/A | |
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Reverse Doclinks |