Lexmark 4513-630, Service Manual

Page: 51 / 184

Diagnostics information
2-23
4513-630, -63W, -6EW
Service checks
Service checks which involve measuring voltages on the LVPS/HVPS (low voltage power supply/
high voltage power supply board) should be performed with the printer positioned on its back side.
Note: When making voltage readings, always use frame ground unless another ground is
specified. See the wiring diagram in the back of the book for more information.
Controller board service check
Controller board service check
FRU Action
Controller board
assembly
Warning: Do not
replace the operator
panel and controller
board at the same
time. Each card
contains the printer
settings. When either
of these cards is new,
it obtains some of the
settings from the other
card. Settings are lost
when both are new
and replaced at the
same time.
POST (Power-On Self Test)
Note: The printer should complete POST in approximately 30 seconds.
If the printer fails to display lights or activate the drive motor, fuser, or fan, then check the
following order:
1. Power to the LVPS/HVPS
2. Power from the LVPS/HVPS to the controller board
3. Cables are plugged in correctly, especially for the operator panel. The printer will not
power-up without a functioning operator panel.
4. The controller board assembly. The LED adjacent to J12 will be illuminated if the card is
powered and good.
5. The operator panel. See “Operator panel service check” on page 2-28 .
24 V dc input from the LVPS/HVPS.
1. Turn the printer off.
2. Disconnect the LVPS/HVPS cable from the controller board at J502.
3. Turn the printer on.
4. 24 V dc on positions 6, 17, and 19 of the cable connector (LVPS/HVPS).
5. If voltage is correct, then check the continuity in the other conductors of the cable. If the
cable is good, then turn the printer off, and check the connectors to the controller board.
6. Verify that pins 10, 12, 14, 16, and 18 on both the cable and the card connector are
grounded.
7. If grounds are not correct on the cable, but the cable passes continuity otherwise, then
check the LVPS/HVPS.
8. If the grounds are not correct on the controller board, then replace the controller board.
(Check with one probe on the connector pin and the other on the card’s ground plane
found at each screw head.)
Controller board voltage outputs
Turn the printer off, and plug the LVPS/HVPS cable into J502 of the controller board. See
the wiring diagram at the end of the manual which identifies the output voltages and
grounds for a good controller board.
Turn the printer off before plugging or unplugging any connectors.