122.05 And 122.06 Error Code Service Check - Lexmark C78x Service Manual

122.05 and 122.06 error code service check

Error codes 122.05 and 122.-6 indicate that the fuser didn't increase in temperature enough. Error code 122.05
may also indicate a problem in the fuser assembly with the hot roll bearings, hot roll thermistor, LVPS, or the
system board.
Step Actions and questions
1 Measure the voltage on connector J17-11 on the
system board.
The voltage measures approximately 0.13 V dc to
0.64 V dc as the hot roll lamp turns off and on.
Is the voltage correct?
2 Remove the fuser from the printer. Check continuity of
the hot roll lamp by measuring between pins 1 and 2
on the AC fuser connector on the fuser assembly.
Is there continuity?
3 Check to make sure that the hot roll lamp is installed
correctly.
Is the hot roll lamp installed correctly?
Reinstall the fuser assembly. Watch to see if the lamps
4
turn on and off as they heat up.
Do the lamps turn on?
Turn the printer on, and allow it to reach a Ready
5
prompt.
Note: The printer may not complete POR and
continues to display the error code.
Remove the fuser assembly from the printer. Measure
the voltage on connector J17-6 on the system board.
The voltage should measure approximately +3.3 V dc.
Is the voltage correct?
6 Measure the voltage on the fuser DC control connector
on the LVPS. Measure the voltage on pin 6 of the
connector.
Does the voltage measure approximately +3.3 V dc?
Yes No
Replace the fuser Go to step 2
assembly. See
"Fuser
assembly
removal" on
page 4-44.
Go to step 4 Go to step 3
Go to step 4 Install the lamp
correctly. If this
does not fix the
problem, replace
the fuser
assembly. See
"Fuser
assembly
removal" on
page
Go to step 5 Replace the
LVPS assembly.
See
assembly
removal" on
page
Go to step 6 Replace the
system board.
See
board removal"
on page
Replace the fuser Replace the
assembly. See LVPS assembly.
"Fuser See
assembly assembly
removal" on removal" on
page 4-44. page
Diagnostic information
5061
4-44.
"LVPS
4-53.
"System
4-90.
"LVPS
4-53.
2-21