Power Systems Checkout (3545)
Power Systems Checkout
If the 'power good' light 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 shut off. To verify that the power supply is operating
correctly, do the following:
- Power-off the computer and disconnect the Dock I power cord.
- Remove all internal and external devices, and the computer
from the Dock I.
- Remove power supply connector P3 from the I/O card and 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 board of the Dock I.
- Connect the Dock I power cord.
- Check the power supply voltages on connector P3
using Table 1 and Table 3, then check that the fan is turning.
If the voltage is not correct or the fan is not turning, replace the
power supply.
- Disconnect the Dock I power cord.
- Remove the jumpers installed in Step 4.
- Remove power supply connector P1 from the main board
and P2 from the I/O card.
- Install jumpers between pins 2 and 6, and pins 8 and 9
of connector P2 of the power supply.
- Connect the Dock I power cord.
- Check the power supply voltages on connectors P1, P2, and
the SCSI power supply connector using Table 1 and
Table 3, then check that the fan is turning.
If any of the voltages are not correct, replace the power supply.
If all voltages are correct, the power supply is working
correctly.
Other Dock I parts can cause 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 (Table 2)
| Pin |
Signal |
V dc Min. |
V dc Max. |
| 1, 2, 3 |
+5 volts |
+4.8 |
+5.25 |
| 4, 5 |
Ground |
- |
- |
| 6 |
-12 volts |
-11.46 |
-13.2 |
| 7 |
Ground |
- |
- |
| 8 |
+12 volts |
+11.46 |
+12.6 |
| 9 |
-5 volts |
-4.53 |
-5.5 |
| 10 |
Ground |
- |
- |
Power Supply Connector P2 (Table 3)
| Pin |
Signal |
V dc Min. |
V dc Max. |
| 1 |
Power on |
- |
- |
| 2 |
System on |
+4.0 |
+5.25 |
| 3 |
VCC |
- |
- |
| 4 |
Mode control |
- |
- |
| 5 |
+5 volts |
+4.8 |
+5.25 |
| 6, 8 |
Ground |
- |
- |
| 7 |
+12 volts |
+11.46 |
+12.6 |
| 9 |
Docked |
- |
- |
| 10 |
NC |
- |
- |
Power Supply Connector P3 (Table 4)
| Pin |
Signal |
V dc Min. |
V dc Max. |
| 1 |
CVCC |
+19 |
+21 |
| 2 |
Ground |
- |
- |
SCSI Power Supply Connector (Table 5)
| Pin |
Signal |
V dc Min. |
V dc Max. |
| 1 |
+12 volts |
+11.46 |
+12.6 |
| 2, 3 |
Ground |
- |
- |
| 4 |
+5 volts |
+4.8 |
+5.25 |
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