NEC NC1600C Service Manual page 103

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