Lower Engine Pcba Fuse 4 Blown; Upper Engine Pcba Fuse 5 Blown; Lower Engine Pcba Fuse 6 Blown - Lexmark C950 Service Manual

5058-030

191.08 Lower engine PCBA fuse 4 blown

Step Action and questions
Warning: Remove the cause of
1
blown fuse before replacing the
lower engine PCBA.
Check the following parts circuits
for overcurrent and overvoltage:
• Tray module controller PCBA
• HCF
Are the current and voltage
values normal?
POR the machine.
2
Does the error continue?

191.09 Upper engine PCBA fuse 5 blown

Step Action and questions
Warning: Remove the cause of
1
blown fuse before replacing the
lower engine PCBA.
Check the finisher circuit for
overcurrent and overvoltage.
Are the current and voltage
values normal?
POR the machine.
2
Does the error continue?

191.10 Lower engine PCBA fuse 6 blown

Step Action and questions
Warning: Remove the cause of
1
blown fuse before replacing the
lower engine PCBA.
Check the following parts circuits
for overcurrent and overvoltage:
• Media transport/MPF drive
motor
• Media feed lift motor
• Fuser pressure roll retract
motor
• Waste toner agitator motor
Are the current and voltage
values normal?
Service Manual
2-78
Yes
Go to step 2.
Replace the lower engine PCBA.
Go to
"Lower engine PCBA
removal" on page 4-98.
Yes
Go to step 2.
Replace the lower engine PCBA.
Go to
"Lower engine PCBA
removal" on page 4-98.
Yes
Go to step 2.
No
Replace the faulty parts, or repair
the circuits.
Problem resolved
No
Replace the faulty parts, or repair
the circuits.
Problem resolved
No
Replace the faulty parts, or repair
the circuits.
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