ViewSonic PJ750-2 Service Manual - Page 16

ViewSonic, Corporation, CONFIDENTIAL, PJ750-2

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Power can not be turned on Are voltage input on the PWB assembly NO Drive at standby mode? 1812 C) : +14V YES IV22 C) : +17V 1102 : +6V 1841 : +4.3V Disconnect TSW from Power unit (circuit). And check TSW short or open? Short Open TSW Power unit (circuit) Fuse on Power unit (circuit) What is the state of TEMP indicator D301? Not light Lights DC FAN (intake) Blinks DC FAN (exhaust) or PWB assembly Sensor What is the state of LAMP indicator D302? Blinks Is the LAMP COVER set? NG Set the LAMP COVER Not light PWB assembly Drive Lamp or Power unit (ballast) OK Is the LAMP connection? NG Set the LAMP again OK Is the voltage at pin ® and C of E809 same? YES PWB assembly Drive NO PWB assembly Limit SW ViewSonic Corporation CONFIDENTIAL -- DO NOT COPY PJ750-2 13

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Power
can
not
be
turned
on
Are
voltage
input
on
the
PWB
assembly
Drive
at
standby
mode?
YES
What
is
the
state
of
TEMP
indicator
D301?
Not
light
What
is
the
state
of
LAMP
indicator
D302?
Not
light
NO
1812
C)
:
+14V
IV22
C)
:
+17V
1102
:
+6V
1841
:
+4.3V
PWB
assembly
Drive
Lights
Disconnect
TSW
from
Power
unit
(circuit).
And
check
TSW
short
or
open?
Short
Open
Power
unit
(circuit)
Blinks
Blinks
DC
FAN
(intake)
DC
FAN
(exhaust)
or
PWB
assembly
Sensor
Is
the
LAMP
COVER
set?
Lamp
or
Power
unit
(ballast)
OK
Is
the
LAMP
connection?
OK
Is
the
voltage
at
pin
®
and
C
of
E809
same?
NO
TSW
Fuse
on
Power
unit
(circuit)
PWB
assembly
Limit
SW
NG
NG
YES
Set
the
LAMP
COVER
Set
the
LAMP
again
PWB
assembly
Drive
ViewSonic
Corporation
CONFIDENTIAL
--
DO
NOT
COPY
PJ750-2
13