Hitachi ED-A110A1DN Service Manual page 17

**: DC fan connectors are E801, E802,
E803, E804, E805 and E808.
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)
CP-A100 / ED-A100 / ED-A110 (A1DN)
is
Blinks
YES
(5V or higher)
at the (1) of E806 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 D303
during operation?
Is the
LAMP installation
correct?
Not light
Is the
voltage at
the (4) of E806 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
D302?
Not light
and blink
Is
the voltage
"L" during warming-
up?
PWB assembly MAIN
No
Power unit (ballast)
f ≥ 40Hz
17
*: 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
0.5 to 2kΩ
NG (open / short)
Thermistor
(E1/E2)
YES
"L" = 0V
MAIN
OK
MAIN