Lexmark X95 series - 191.05 Upper Engine PCBA Fuse Blown; Lower Engine PCBA Fuse 2 Blown; Lower Engine PCBA Fuse 3 Blown

Diagnostic information 2-83
7558-xxx
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191.02–191.05 Upper engine PCBA fuse blown
191.06 Lower engine PCBA fuse 2 blown
191.07 Lower engine PCBA fuse 3 blown
Step Action and questions Yes No
1 POR the machine.
Does the error remain?
Go to step 2. Problem resolved
2
Check the upper engine PCBA.
Is the above component
properly connected?
Replace the upper engine PCBA.
Go to “Lower engine PCBA
removal” on page 4-104.
Replace the connections.
Step Action and questions Yes No
1 Warning: Remove the cause of
blown fuse before replacing the
lower engine PCBA.
Check the following parts circuits
for overcurrent and overvoltage.
• LED printhead (Y, M, C, K)
• Printhead interface contact
(Y, M, C, K)
Are the current and voltage
values normal?
Go to step 2. Replace the faulty parts.
2
POR the machine.
Does the error continue?
Replace the lower engine PCBA.
Go to “Lower engine PCBA
removal” on page 4-104.
Problem resolved
Step Action and questions Yes No
1 Warning: Remove the cause of
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?
Go to step 2. Replace the faulty parts.
2
POR the machine.
Does the error continue?
Replace the lower engine PCBA.
Go to “Lower engine PCBA
removal” on page 4-104.
Problem resolved