Lexmark 7003-050 X340n, Service Manual

Page: 42 / 162

Diagnostic information
2-21
7003-XXX
Controller card service check
FRU Action
Controller card assembly 24 V dc input from the LVPS/HVPS.
• Turn the MFP off.
• Disconnect the LVPS/HVPS cable from the controller card at
J7. See
“Controller card” on page 5-4 for more information.
• Turn the MFP on.
24 V dc from the cable connector of J7, pins 9 and 10.
Verify that pin 7 on both the cable and the card connectors is ground.
• If voltage is correct, check the continuity in the cable. If the
cable is good, see the
“Controller card” on page 5-4 for
more information.
• If grounds are not correct on the cable, first check it for
continuity and then check the LVPS/HVPS. See
“LVPS/
HVPS service check” on page 2-25
• If the grounds are not correct on the controller card, replace
the controller card. (Check with one probe on the connector
pin and the other on the ground plane of the card found at
each screw head.)
Note: With all cables connected, the MFP should complete POST
within approximately 12–15 seconds in the following sequence:
1. The function and scan quality LEDs illuminate for one second and
then flash three times.
2. Loading is displayed on the operator panel.
3. The CCD illuminates, and the scanner performs a calibration.
4. The drive motor runs.
5. The scanner CCD returns to the home position.
6. Error messages are displayed if applicable.
7. The MFP cycles down into standby mode/ready.
Ready
is
displayed on the operator panel.
If immediately following power-on, the operator panel lights are active
but the MFP does not go through steps 1 and 2 above, replace the
controller card assembly.
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