Lexmark X95 series, Service Manual, Page: 143 / 1182

Diagnostic information
2-91
7558- xxx
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191.19 Upper engine PCBA access failure
191.20 Upper engine PCBA buffer failure
191.23 Lower engine PCBA fuse 14 blown
Step Action and questions Yes No
1
POR The machine.
Does the error continue?
Go to step 2 Problem resolved
2
Turn the power OFF and check
whether there is poor connection
between the EEPROM and the
upper engine PCBA.
Are there no problems with the
connection?
Turn the power OFF, and replace
the upper printer engine
assembly. Go to
“Upper printer
engine PCBA removal” on
page 4-189
.
Problem resolved
Step Action and questions Yes No
1
POR The machine.
Does the error continue?
Go to step 2 Problem resolved
2
Turn the power OFF, and check
whether there is poor connection
between the EEPROM and the
upper engine PCBA.
Are there no problems with the
connection?
Turn the power OFF, and replace
the upper printer engine
assembly. Go to
“Upper printer
engine PCBA removal” on
page 4-189
.
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:
• Upper redrive assembly
• Lower redrive shift motor
assembly
Are the current and voltage
values normal?
Go to step 2 Replace the faulty parts, or repair
the circuits.
2
POR the machine.
Does the error continue?
Replace the lower engine PCBA.
Go to
“Lower engine PCBA
removal” on page 4-106
.
Problem resolved