A SERVICE OF

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Diagnostic information 2-63
5021-0XX
985Duplex connection error 1 service check
Step Questions / actions Yes No
1 Check duplex unit cable. is
cable properly connected?
Replace duplex
unit. See
Duplex unit
assembly
removal on
page 4-13. If
problem
persists, go to
step 2.
Properly connect
cable. If problem
persists, go to
step 2.
2 Check cable connection to
connector ACN4 located on
low voltage power supply.
See Engine controller
board removal on
page 4-55 for steps
required to remove engine
controller board cover. This
will allow access to ACN4.
Is cable properly
connected?
Go to step 3. Properly connect
cable. If problem
persists, go to
step 3.
3 Disconnect cable from
ANC4 and check for
continuity between ACN4
connector and duplex
connector located on back
of printer. Is there
continuity?
Replace low
voltage power
supply. See
Low voltage
power supply
(LVPS) with
cage removal
on page 4-60.
Replace faulty
cable.