NEC DLP CINEMA NC1600C, Service Manual

Page: 103 / 382

“Confidential, Do Not Duplicate without written authorization from NEC.”
4- 8
TROUBLESHOOTING
Lamp Over Temp.
Over Temp. Out
Over Temp.In
Over Temp. Chest
Over Temp. DMD
Over Temp. Rear
No
Yes Is the ambient temperature 35
°
C or above?
Adjust air conditioning so that the
ambient temperature is below 35
°
C
or equipment operating temperature
(upper limit).
Yes
No Is there no clogging at the exhaust port? Remove the clogging obstacle.
Yes
No Is there no clogging in the air filter?
Replace the air filter.
Yes
No
Is ventilation normal when the power is ON?
Is the potential at #1 on the PJDIV PWB side
of Cable TH maintained at the GND level?
Is it impossible to eliminate malfunction even
after the replacement of the PJDIV PWB?
Check the connectors in the CPU PWB and
between the CPU PWB and the PJDIV PWB.
Replace them, as required.
Replace the related fan if there is any
error such as fan stop.
Yes
No
Check connections in regard to dis-
connections, if any, in Cable TH and
examine the condition of thermostat
(short-circuited at room temperature).
Yes
No
End of repair