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IBM-AUSTRIA - PC-HW-Support 30 Aug 1999 |
Power Supply (3546)
Power Supply
If the power-on indicator is not on and the power supply fan is not
turning, check the power cord for continuity and correct installation.
If the power cord is not the problem, either the power supply is
defective, or another component is defective causing the power supply
to cut off. To verify that the power supply is operating correctly,
do the following:
- Turn off the computer and disconnect the Dock II power cord.
- Remove all internal and external devices, and the computer from
the Dock II.
- Remove the power supply connector CN26 from the main card
(refer to 'Main Card')
and CN56 from the riser card (refer to 'Riser Card').
- Remove the SCSI power supply connector from the SCSI device.
- Install jumpers between pins 1 and 2, and pins 3 and 4 of JP2
on the main card.
- Connect the Dock II power cord.
- Check the power supply voltages on the CN26, CN56, and SCSI
connectors by referring to the respective voltage tables.
Then, check that the fan is turning.
If the voltage is not correct or the fan is not turning, replace the
power supply.
- Connect the Dock II power cord.
If any of the voltages are not correct, replace the power supply.
If replacing the power supply does not correct the problem, then
replace the main card.
Power Supply Connector CN25
| Pin |
Signal |
Vdc Min. |
Vdc Max. |
| 1 |
+5 volts |
+4.75 |
+5.25 |
| 2 |
Ground |
- |
- |
| 3 |
+12 volts |
+11.4 |
+12.6 |
| 4 |
Ground |
- |
- |
| 5 |
Sub+5 volts |
+4.75 |
+5.25 |
| 6 |
System On |
- |
- |
| 7 |
Power On |
- |
- |
| 8 |
Mode Control |
- |
- |
| 9 |
Security |
- |
- |
| 10 |
Ground |
- |
- |
| 11 |
Sub+12 volts |
+11.4 |
+12.6 |
| 12 |
NC |
- |
- |
Power Supply Connector CN26
| Pin |
Signal |
Vdc Min. |
Vdc Max. |
| 1 |
CVCC |
+19 |
+21 |
| 2 |
Ground |
- |
- |
Power Supply Connector-Reserved
| Pin |
Signal |
Vdc Min. |
Vdc Max. |
| 1 |
CVCC |
+19 |
+21 |
| 2 |
Ground |
- |
- |
Power Supply Connector CN56
| Pin |
Signal |
Vdc Min. |
Vdc Max. |
| 1, 2, 3 |
+5 volts |
+4.75 |
+5.25 |
| 4, 5 |
Ground |
- |
- |
| 6 |
+12 volts |
+11.4 |
+12.6 |
| 7 |
Ground |
- |
- |
| 8 |
-12 volts |
-11.4 |
-13.2 |
| 9 |
-5 volts |
-4.53 |
-5.5 |
| 10 |
Ground |
- |
- |
SCSI Power Supply Connector
| Pin |
Signal |
Vdc Min. |
Vdc Max. |
| 1 |
+12 volts |
+11.46 |
+12.6 |
| 2, 3 |
Ground |
- |
- |
| 4 |
+5 volts |
+4.758 |
+5.25 |
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