Hitachi CP-X505 Service Manual page 15

Open
PWB assembly SW
E808, E941
Re-attach lamp Lamp door
door
**: 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 (0V)
to the pin (4) of E805
and E804 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)
CP-X505(EDX35N)
Blinks
Measure
resistance*
between pins (1) and
(2) of E808 when the
S941 is pushed.
0Ω
PWB assembly MAIN
is
Blinks
YES
(5V or higher)
is
YES
(1V or higher)
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?
Is the
LAMP installation
correct?
Not light
and blink
Is the
voltage at
the (4) of E807 on
the PWB assembly MAIN
fixed to "L" during
warming-up?
Change the
lamp. Does lamp
light?
No
Power unit (ballast)
What
Lights
is the state of
TEMP indicator
DK02?
Not light
and blink
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.
NG
install the Lamp
YES
YES
"L" = 0V
PWB assembly
Not light
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