Hitachi CP-X2520 Service Manual page 13

**: DC fan connectors are E801, E802,
E803, E806 and E807.
Are
the voltage
supplied to the
NO (0V)
pin (2) of connectors**
for DC fans 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-X2520 ( M2-25ED ) / CP-X3020 ( M2-30ED )
Blinks
is
YES
(5V or higher)
at the (1) of E814 on the
PWB assembly MAIN set to
Correct waveform is drawn below.
incorrect
Lamp does not light
What
is the state of
Light
LAMP indicator D303
during operation?
the LAMP
Not light
installation correct
Is the
voltage at
the (4) of E814 on
the PWB assembly MAIN
fi xed to "1~3V" during
warming-up?
Change
the lamp. Does
lamp light?
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
13
*: Be sure to unplug the power cord
before measuring resistance.
Is
NG
install the Lamp
?
YES
NO
PWB assembly
Yes
Light
Lamp
Not light
Power unit (circuit)
Measure
resistance* of
pins #2 to #3, #2 to #4,
#1 to #5 of cable connector
disconnected from
E302.
PWB assembly
NG
(open / short)
#2 - #3 : 20 to 100kΩ
#2 - #4 : 5 to 20kΩ
#1 - #5 : approx. 94Ω
PWB assembly SENSOR
YES
"L" = 0V
MAIN
OK
MAIN