Hitachi CP-X600 Service Manual page 15

**: DC fan connectors are E801,
E802, E803, E804 and E805.
Are
the
voltage
supplied to the pin
NO (0V)
(2) of connectors** for
DC fans soon after
the button
pressed?
PWB assembly
MAIN
Is
the
voltage supplied
No
(<1V or > 5V) to the pin (4) of E805
and E804 soon after
the button
pressed?
PWB assembly
MAIN
Observe
the voltage
waveforms at pin (1)
Correct
of connectors for DC fans**
soon after the button
is pressed.
PWB assembly
MAIN
DC fan
(failed in above check)
CP-X600(EDX40K3)
is
Blinks
YES
(5V or higher)
is
YES
(1V ~ 5V)
at the (1) of E807 on the
PWB assembly MAIN set to
incorrect
Correct waveform is drawn below.
Lamp does not light
What
is the state of
Light
LAMP indicator DK03
during operation?
the LAMP
installation
correct?
Not light
Is the
voltage at the
(4) of E807 on the
PWB assembly MAIN fi xed
to "1V~5V" during
warming-up?
Change
the lamp. Does
lamp light?
No
Power unit (ballast)
What
Lights
is the state of
TEMP indicator
DK02?
Not light
Is
the voltage
"L" during warming-
up?
PWB assembly MAIN
No
Power unit (ballast)
f ≥ 40Hz
15
*: Be sure to unplug the power cord
before measuring resistance.
Is
NG
install the Lamp
YES
Not light
PWB assembly
Yes
Light
Lamp
Power unit (circuit)
Measure
resistance
of E1 and E2 after
disconnecting them
from MAIN
board.
PWB assembly
E2: 5 to 20kΩ
E1: 0.5 to 2kΩ
NG (open / short)
Thermistor
(E1/E2)
YES
"L" = 0V
MAIN
OK
MAIN