Hitachi CPX1 Service Manual page 13

**: 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
YES
(5V or higher)
Observe
the voltage
Correct
waveforms at pin (1) of
connectors for DC fans**
soon after the button
is pressed.
PWB assembly
MAIN
incorrect
DC fan
(failed in above check)
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CPX1(M1-20)
Lamp does not light
is the state of
LAMP indicator D303
during operation?
Blinks
is the state of
TEMP indicator
is
voltage at the (3) of
E804 on the PWB assembly
MAIN set to "L" during
warming-up?
Power unit (ballast)
Correct waveform is drawn below.
13
*: Be sure to unplug the power cord
before measuring resistance.
What
Light
Is the
LAMP installation
correct?
Not light
YES
Is
the voltage
at the (1) of
E804 on the PWB
assembly MAIN fixed
to "L" during
warming-
up?
NO "H"
Change the
lamp. Does lamp
light?
No
Power unit (ballast)
Measure
resistance of
What
Lights
E1 and E2 after
disconnecting them
from MAIN
D302?
Not light
and blink
Thermistor
(E1/E2)
Is the
YES
"L" = 0V
PWB assembly MAIN
No
f ≥ 40Hz
NG
install the Lamp
YES "L"=0V
PWB assembly
MAIN
Light
Lamp
Power unit (circuit)
OK
board.
PWB assembly
MAIN
E1: 5 to 20kΩ
E2: 0.5 to 2kΩ
NG(open/short)