Hitachi SM0599 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)
PWB assembly MAIN set to
incorrect
Correct waveform is drawn below.
Lamp does not light
What
is the state of
LAMP indicator D303
during operation?
LAMP installation
correct?
Not light
voltage at
the (4) of E806 on
the PWB assembly MAIN
fixed to "L" during
warming-up?
Change the
lamp. Does lamp
No
Power unit (ballast)
What
Lights
is the state of
TEMP indicator
D302?
Not light
and blink
Is
the voltage
at the (1) of E806 on the
"L" during warming-
up?
No
Power unit (ballast)
f 40Hz
17
*: Be sure to unplug the power cord
before measuring resistance.
Light
Is the
NG
install the Lamp
YES
Is the
YES
"L" = 0V
PWB assembly
Not light
Light
light?
Power unit (circuit)
Measure
resistance
of E1 and E2 after
disconnecting them
from MAIN
board.
PWB assembly
0.5 to 2k
NG (open / short)
Thermistor
(E1/E2)
YES
"L" = 0V
PWB assembly MAIN
MAIN
Lamp
OK
MAIN