ViewSonic PJ452 - LCD XGA Projector-4.9LBS Service Manual page 18

Can not control to RS-232C
Check the
RS-232C cable.
Are pin No. 2 and 3
Check the
power supply voltage
of E800 the voltage
PWB assembly MAIN
No sound
voltage input at pin
(1)(3)(5)(7) of the E800 on
the PWB assembly
the projector and
disconnect the Speaker
cable from ESPL.Measure
the resistance of
the Speaker.
ViewSonic Corporation
NO
crossed?
YES
NO
correct?
YES (1): +13.2V
(3): +17V
(5): +6.6V
(7): +4.1V
Are
NO
MAIN?
(1): +13.2V
YES
(3): +17V
(5): +6.6V
(7): +4.1V
Turn off
about 8Ω
0Ω or infinity
Speaker
Use cross cable
Power unit (circuit)
Power unit (CIRCUIT)
PWB assembly MAIN
Confidential - Do Not Copy
15
The check after parts change
1. PC power supply OFF
2. Connection of cable
3. Projector starting
4. PC starting
*When not operating :
PC set up change of cable.
PJ452