Hitachi CPX380W Service Manual page 14

PJ750-2
CP-X380W
Connect
E302 (Sensor
PCB)
DC FAN
Sensor PCB
14
Lamp does not light
What is the state of
Light
LAMP indicator D302
during operation?
No light
Blinks
Is E302
(Sensor PCB)
NO
securely connected to
Drive PCB by
the cable?
YES
Measure
H (3.3V)
voltage at
the of I256 on the
2
Drive PCB.
L (0V)
Measure
the resistance of
Infinity
TH950 on the Sensor
PCB with
disconnected
E302.
about 10k
Drive PCB
Light
Change the lamp.
Does lamp light?
No light
Is the
voltage at collector
YES
of Q801 on the Drive
PCB fixed to "L" during
warming-up?
"L" = 0V
NO
Power Unit (Ballast) Power Unit (Circuit)
What is the state of
TEMP indicator
D301?
No light
Is the voltage
at pin of L818 on
8
NO
the Drive PCB
set to "L" during
"L" = 0V
warming-up?
YES
Drive PCB
Power Unit (Ballast)
Lamp
Drive PCB