2-26 Service Manual
5025-2xx, 4xx
936.xx, 937.xx—Transport motor service check
950.xx NVRAM Failure service check
Warning: Replace one of the following components, and perform a POR before replacing a second
component. Never replace both of the components without performing a POR after installing each
one, or the printer will be rendered inoperable:
• Operator panel assembly
• Controller board
Warning: Never install and remove components listed above as a method of troubleshooting components.
Once a component has been installed in a printer, and the printer is powered on, it cannot be
used in another printer. It must be returned to the manufacturer.
This error code indicates a mismatch between the memory on the operator panel assembly and the one on the
controller board.
Step Questions / actions Yes No
1 Turn the printer off, and remove the rear
shield. See “Rear shield removal” on
page 4-11. Check the cable at JCARB1 for
proper connection to the controller board.
Is the cable properly connected?
Reconnect the cable. Go to step 2.
2
Turn the printer on, and ten measure the
values of the cable at JCARB1:
Are the values approximately correct?
Replace the main drive gear
assembly. See “Main drive
gear assembly removal”
on page 4-45.
Replace the controller
board. See “Controller
board removal” on
page 4-19.
Step Questions / actions Yes No
1 Have any updates been made to the firmware? Reload the firmware and try
again.
Go to step 2.
Replace the controller board
with a new, and not
previously installed
controller board. See
“Controller board
removal” on page 4-19.
2
Did reloading the firmware correct the
problem?
Problem resolved. Replace the controller board
with a new, and not
previously installed
controller board. See
“Controller board
removal” on page 4-19.
JCARB1
Pin Value
4 +24 V dc
6 +24 V dc
8 +24 V dc
9 Ground
12 Ground
13 +24 V dc
15 +24 V dc
17 +24 V dc
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