FRU Action
LVPS/HVPS board
Controller board
Miscellaneous cables
With the machine off, disconnect the LVPS/HVPS cable from J502 on the
engine board.
Turn the machine on, and verify +24Vdc on pins 17 and 19 of the cable.
Verify +5 V dc on pins 1, 3-5, 11, 13, and 15.
Verify ground on pins 10, 12,14, 16, and 18.
• If any of the values are incorrect, then replace LVPS/HVPS board.
• If the grounds are incorrect, then check ground paths.
•
Check continuity in the cable. If the cable is bad, then call the next
level of support.
• If the values are correct and the toner electrodes are good, then
replace the controller board.
• See “LVPS/HVPS Service Check” and “Engine Board Service Check”
in “Troubleshooting”, if necessary.
Heavy background
Poor development or poorly charged toner particles cause excessive background. This is more
noticeable as the toner cartridge nears end-of-life.
FRU Action
Toner cartridge (not a
FRU)
PC Kit (not a FRU)
Check the toner darkness setting in the driver. Try a lower setting.
Make sure the toner cartridge and PC Kit are correctly installed and the
high voltage contacts are clean.
If the toner cartridge and PC Kit are installed correctly, then try a new PC Kit
first and then toner cartridge.
LVPS/HVPS
Engine board
Check the contacts for correct installation and contamination where contact
is made between the print cartridge assembly and spring contacts which
connect to the LVPS/HVPS board at CN203. Clean as necessary.
If this does not correct the problem, then replace the following FRUs one at
a time in the order shown:
•
LVPS/HVPS board. See “Black page” in “Troubleshooting” for pin
values.
• Engine board
6. Troubleshooting
254
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