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**: DC fan connectors are E801,
E802, E803, E804 and E805.
the voltage
supplied to the pin
NO (0V)
(2) of connectors** for
DC fans soon after
the button
pressed?
PWB assembly
MAIN
NO
voltage supplied
(<1V or >5V)
to the pin (4) of E805
and E804 soon after
the button
pressed?
PWB assembly
MAIN
the voltage
Correct
waveforms at pin (1) of
connectors for DC fans**
soon after the button
PWB assembly
MAIN
(failed in above check)
ViewSonic Corporation
Are
is
Blinks
YES
(5V or higher)
Is
the
is
YES
(1V~5V)
Observe
is pressed.
incorrect
Correct waveform is drawn below.
DC fan
Lamp does not light
What
is the state of
LAMP indicator DK03
during operation?
Not light
LAMP installation
voltage at
the (4) of E807
on the PWB assembly
MAIN fixed to 1~5V
during warming-
Change the
lamp. Does lamp
No
Power unit (ballast)
What
Lights
is the state of
TEMP indicator
DK02?
Not light
Is
the voltage
at the (1) of E807 on the
PWB assembly MAIN set to
"L" during warming-
up?
No
Power unit (ballast)
f ≥ 40Hz
15
Confidential - Do Not Copy
*: Be sure to unplug the power cord
before measuring resistance.
Light
Is the
NG
install the Lamp
correct?
YES
Is the
Not light
PWB assembly
up?
YES
Light
light?
Power unit (circuit)
Measure
resistance
of E1 and E2 after
disconnecting them
from MAIN
board.
E2: 5 to 20kΩ
E1: 0.5 to 2kΩ
NG (open / short)
Thermistor
(E1/E2)
YES
"L" = 0V
PWB assembly MAIN
MAIN
Lamp
OK
PWB assembly
MAIN
PJ1158-1
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