“Confidential, Do Not Duplicate without written authorization from NEC.”
4-7
TROUBLESHOOTING
Lamp Door Open
No
Yes
Improved if the Lamp Door is shut again? End of repair service
Yes
No
Is there any physical damage in the Cover PWB?
Replacement of Cover PWB
Yes
No
Is the POCOV connector disconnected on the
Cover PWB and PJDIV PWB sides?
Reinsertion of the connector
Yes
No
Are POCOV #1 and #2 short-circuited when
the Cover PWB switch is pressed?
Do #1 and #2 maintain continuity on the
Cover PWB and PJDIV PWB sides of POCOV?
Is it impossible to remove the fault even after
the replacement of PJDIV PWB?
Check the connectors between the CPU PWB
and PJDIV PWBs, and replace the CPU PWB
if there is no problem
Replacement of Cover PWB
Yes
No
Replacement of COV
Yes
No
End of repair service
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