Lamp Does Not Light - Hitachi CPX1 Service Manual

**: DC fan connectors are E801,
E802, E806, and E807.
Are
the voltage
supplied to the pin
NO (0V)
(2) of connectors** for
DC fans soon after
the button
pressed?
PWB assembly
MAIN
Observe
the voltage
Correct
waveforms at pin (1) of
connectors for DC fans**
soon after the button
is pressed.
PWB assembly
MAIN
DC fan
(failed in above check)
CPX1(M1-20)
Blinks
is
YES
(5V or higher)
E804 on the PWB assembly
incorrect
Correct waveform is drawn below.

Lamp does not light

What
is the state of
LAMP indicator D303
during operation?
Is the
LAMP installation
correct?
Not light
the voltage
at the (1) of
E804 on the PWB
assembly MAIN fixed
to "L" during
warming-
Change the
lamp. Does lamp
light?
No
Power unit (ballast)
What
Lights
is the state of
TEMP indicator
D302?
Not light
and blink
Is the
voltage at the (3) of
MAIN set to "L" during
warming-up?
PWB assembly MAIN
No
Power unit (ballast)
f ≥ 40Hz
13
*: Be sure to unplug the power cord
before measuring resistance.
Light
NG
install the Lamp
YES
Is
YES "L"=0V
PWB assembly
up?
NO "H"
Light
Lamp
Power unit (circuit)
Measure
resistance of
E1 and E2 after
disconnecting them
from MAIN
board.
PWB assembly
E1: 5 to 20kΩ
E2: 0.5 to 2kΩ
NG(open/short)
Thermistor
(E1/E2)
YES
"L" = 0V
MAIN
OK
MAIN