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Diagnostic Information 2-73
5016-001
4 LVPS Fuses
F401, F402
either or both
continue to blow
after being
replaced.
Turn the printer off and disconnect CN401,
CN402, CN403 and CN406 from the LVPS. Turn
the printer on and:
• If F401 or F402 continues to blow, replace the
LVPS assembly.
• If the fuses do not blow, turn the printer off
and reconnect the cables to the LVPS.
Observing all ESD precautions and removing
power to the printer prior to removing or
replacing any electronic boards, perform the
following:
If installed, remove any options on the
interconnect board. Remove the controller
board assembly and disconnect the engine
interface cable at J2. Turn the printer on.
• If no fuses blow, go to A1.
• If the fuses blow a second time, go to B1.
A1. Reconnect the interface cable to J2 and
replace each option one at a time, checking if
either fuse blows.
• If either fuse blows, replace the defective
option.
• If neither fuse blows, remove the COS SIMM
and any memory SIMMs installed on the
controller board and reinstall the controller
board. Verify if either fuse is blown.
• If either fuse is blown, replace the controller
board. If neither fuse is blown, reinstall any
memory SIMMs and COS SIMM one at a time
to find the defective FRU.
B1. Except for CN402, disconnect all cables
from the engine board assembly. Turn the
printer on.
• If either fuse blows, replace the engine board
assembly.
• If the fuses do not blow, reinstall one cable at
a time until the defective FRU is found.
Replace the FRU that caused the fuse to
blow.
FRU Action