Lexmark C78x User Manual

2-66 Service Manual
5061
956.xx service error service check
Service <xxxx> System Board
982.xx error service check
9
Check the voltage at connector J6-1 when the black
TMC switch is pressed.
Does the voltage measure approximately +3.3 V dc?
Go to step 10 Go to step 11
10
Check the developer HVPS to system board cable for
damage, broken connections, or wire and shorts
between adjacent pins.
Are there any signs of damage to the cable?
Replace the
cable.
Replace the
developer HVPS
board. See
“Developer
HVPS board
removal” on
page 4-39.
11
Disconnect the developer HVPS cable from connector
J6 on the system board. Measure the voltage on
connector J14-1 on the system board.
Does the voltage measure approximately 0 V dc?
Replace the
system board.
See “System
board removal”
on page 4-90.
Replace the
developer HVPS
and developer
HVPS to system
board cable.
Step Actions and questions Yes No
1 Remove all option boards from the system board. Turn
on the printer.
Does the error continue?
Replace the
system board.
See “System
board removal”
on page 4-90.
Go to step 2
2
Replace each option board one at a time, making sure
the boards are properly seated. Turn the printer off and
then on between each option board to view any error
messages.
Does the error reappear?
Replace the
failing option
board.
Problem resolved
Step Actions and questions Yes No
1 Are the output options not recognized? Go to step 2 Go to step 4
2
Remove the output option, and reinstall it on the
printer. Power on the printer.
Does this fix the problem?
Replace the
output option.
Replace the top
option
autoconnect
cable.
3
Remove the input option, and reinstall it on the printer.
Power on the printer.
Does this fix the problem?
Problem resolved Go to step 4
4
Voltage check, base printer autoconnect connector—
Turn the power off, and remove the output option from
the printer. Check the voltages on the base printer top
autoconnect connector. See “Autoconnect—top” on
page 5-18.
Are the voltages correct?
Replace the
output option.
Replace the
bottom option
autoconnect
cable.
Step Actions and questions Yes No

Lexmark C78x Specifications

General

Brand	Lexmark
Model	C78x
Category	Printer
Language	English