Lexmark C78x User Manual

2-56 Service Manual
5061
925.02 error code service check
Fuser fan (main fan)
926.01 error code service check
VTB fan
Step Actions and questions Yes No
1 Turn the power off, manually spin the fan, and check
that it rotates freely.
Does the fan rotate freely?
Go to step 2 Replace the fuser
fan. See “Fuser
fan removal” on
page 4-47.
2
Check the fuser fan cable connection to the system
board JM1 for correct installation.
Is the cable installed correctly?
Go to step 3 Install the cable
correctly.
3
Disconnect the fuser fan from JM1 on the system
board, and check the voltages on JM1.
Are the voltages correct?
Replace the fuser
fan. See “Fuser
fan removal” on
page 4-47.
Replace the
system board.
See “System
board removal”
on page 4-90.
Step Actions and questions Yes No
1 Turn the power off, manually spin the fan, and check
that it rotates freely.
Does the fan rotate freely?
Go to step 2 Replace the VTB
fan. See
“Vacuum
transport belt
(VTB) fan
removal” on
page 4-98.
2
Check the VTB fan cable connection to the system
board JY1 for correct installation.
Is the cable installed correctly?
Go to step 3 Install the cable
correctly.
3
Disconnect the VTB fan from JY1 on the system board,
and check the voltages on JY1.
Are the voltages correct?
Replace the VTB
fan. See
“Vacuum
transport belt
(VTB) fan
removal” on
page 4-98.
Replace the
system board.
See “System
board removal”
on page 4-90.
Pin Fan on Fan off Fan disconnected
Fan switch on
Fan discon-
nected
Fan switch
off
JM1-1 +1.6 V dc +3.3 V dc +3.3 V dc +3.3 V dc
JM1-20 V0 V0 V 0 V
JM1-3 +1.9 V dc 0 V dc 0 V +2 V dc
JM1-4 +24 V dc +24 V dc +24 V dc +24 V dc
JM1-5 Ground
Pin Fan on Fan off Fan
disconnected
fan switch on
Fan
disconnected
fan switch off
JY1-1 +1.6V dc +3.3 V dc +3.3 V dc +3.3 V dc
JY1-20 V0 V0 V 0 V
JY1-3 +3.1 V dc 0 V dc 0 V +2 V dc
JY1-4 +24 V dc +24 V dc +24 V dc +24 V dc

Lexmark C78x Specifications

General

Brand	Lexmark
Model	C78x
Category	Printer
Language	English