Hitachi CPS317 Service Manual page 16

Lamp does not light
What is the state of
LAMP indicator
during operation?
Not light
H (3.3V)
DC FAN
voltage at the
(INTAKE A/B)
Infinity
PWB assembly
SENSOR
Light
1
assembly Drive fixed to "L"
Power unit (ballast)
Blinks
What is the state of
Measure sure
of I256
2
on the PWB assembly
Drive.
at the
L (OV)
the PWB assembly Drive
Measure
the resisitance of
TH950 on the PWB
assembly SENSOR at
disconnecting
E302.
about 10k
Power unit (ballast)
PWB assembly Drive
Light
Change the lamp.
Does lamp light?
Not light
Is the
voltage at the
YES
of E805 on the PWB
during warming-up?
"L" = 0V
NO
Power unit (circuit)
TEMP indicator?
Not light
Is the voltage
of E805 on
3
NO
set to "L" during
"L" = 0V
warming-up?
YES
PWB assembly Drive
Lamp
PWB assembly Drive
15