Lexmark T632 Service Manual page 80

4060-xxx
FRU
5 LVPS
6 Interconnect board
7 Interconnect board
8 Communications card
9 Features or option installed
on the interconnect board
assembly
10 LVPS fuse F1 (primary
power)
2-46
Service Manual
Action
Unplug the AC line cord from the LVPS and disconnect the
interconnect card cable on the LVPS. Reconnect the AC line cord and
measure the voltage on CN2-1 on the LVPS. The voltage should
measure approximately +5 V dc.
18
9
If the voltage is correct, go to step 6. If the voltage is incorrect, go to
step 10.
Unplug the AC line cord from the LVPS and reconnect the
interconnect board cable to CN2 on the LVPS. Reconnect the AC line
cord, turn the machine on and measure the voltage at the +5 V test
point on the interconnect board. The voltage should read
approximately +5 V dc.
Test
Points
If correct, replace the following FRUs in the order shown:
• System board
• Interconnect board
If the voltage is incorrect, go to step 7.
Unplug the AC line cord from the LVPS, remove the inner shield and
system board assembly from the interconnect board.
Note: The inner shield with system board attached can be moved far
enough away from the printer to access the interconnect board
voltage test points.
Measure the voltage at the +5 V test point on the interconnect board.
The voltage should measure +5 V dc. If correct, go to step 11. If
incorrect, go to step 8.
Turn the printer off and remove the communications card. Check the
voltage at the 5 V test point on the interconnect board.
If the voltage is correct, replace the communication card assembly. If
the voltage is incorrect, go to step 9.
Warning: Observe all the ESD precautions and turn the printer off
before any feature or option cards are removed or replaced.
Remove one option/feature at a time to help isolate the failing part.
Replace the faulty part.
Unplug the AC line cord, remove the LVPS from the printer, and
check the continuity of fuse F1. See
removal" on page 4-42.
If continuity is correct, replace the LVPS assembly.
If continuity is incorrect, replace fuse F1 and measure the voltage at
CN2-1. If the voltage is correct, reconnect the interconnect board
cable, reinstall the system board, and recheck the printer for a dead
machine condition. If the printer is still inoperative, go to step 11.
If the voltage is incorrect, replace the LVPS assembly.
10
1
J5
J4
F1
+24V
F2
+5V
"Low voltage power supply