2-124 Service Manual
7526
920.15, 920.20—POST—Bad transfer module NVRAM data error service check
920.16—POST—Bad printhead NVRAM data error service check
Step Questions / actions Yes No
1 1. Turn the printer off.
2. Remove the rear frame cover. See “Rear
frame cover removal” on page 4-37.
3. Check the JTPS1 connector for any
damage, and then reseat the JTPS1
cable.
4. Check the transport cable connection to
the transport belt for any damages.
a.Open the front door cover
b.Reseat the transport cable in the
transfer belt module.
Did the error clear?
Problem resolved. Go to step 2.
2
Replace the transfer belt module. See
“Transfer module removal” on page 4-180.
Does the problem persist?
Go to step 3. Problem resolved.
3
Connect a new transport cable from outside
of the machine.
Does the problem persist?
Return the old transport
belt module and old
transport cable then
replace the system board.
See “System board
removal” on page 4-157.
Return the old transport
belt module and replace
the transport cable. See
“Transport cable
removal” on page 4-182.
Step Questions / actions Yes No
1 1. Turn the printer off.
2. Remove the rear frame cover. See “Rear
frame cover removal” on page 4-37.
3. Reseat the large printhead cable in
connector JPH1.
Did the error clear?
Problem resolved. Go to step 2.
2
Check the cable in connector JPH1 for pinch
points and any other damage to the cable or
connector.
Is the cable damaged?
Replace the printhead. See
“Printhead removal,
installation, and
adjustment” on
page 4-140.
Go to step 3.
3
1. Perform the printhead verification to check
whether the printhead replacement fixes
the problem. See “Printhead
verification” on page 3-52.
2. POR the printer.
Did the printhead motor pass the test?
Replace the printhead. See
“Printhead removal,
installation, and
adjustment” on
page 4-140.
Replace the system board.
See “System board
removal” on page 4-157.
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