Lexmark T630 - Printer - B/w, Service Manual

Page: 80 / 345

2-46
Service Manual
4060-xxx
5 LVPS 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 approxi5 V dc.
If the voltage is correct, go to step 6. If the voltage is incorrect, go to
step 10.
6 Interconnect board 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
approxi5 V dc.
If correct, replace the following FRUs in the order shown:
• System board
• Interconnect board
If the voltage is incorrect, go to step 7.
7 Interconnect board 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 m5 V dc. If correct, go to step 11. If
incorrect, go to step 8.
8 Communications card 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.
9
Features or option installed
on the interconnect board
assembly 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.
10
LVPS fuse F1 (primary
power) Unplug the AC line cord, remove the LVPS from the printer, and
check the continuity of fuse F1. See
“Low voltage power supply
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.
FRU Action
CN2
1
9
10 18
J4 J5
F2
F1
+24V
+5V
Test
Points