ViewSonic PJ452 Service Manual - Page 18

Power unit CIRCUIT

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

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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.
Can not control to RS-232C
PWB assembly MAIN
NO
NO
YES
Use cross cable
Check the
RS-232C cable.
Are pin No. 2 and 3
crossed?
YES
Power unit (circuit)
Check the
power supply voltage
of E800 the voltage
correct?
(1): +13.2V
(3): +17V
(5): +6.6V
(7): +4.1V
Speaker
No sound
NO
YES
Power unit (CIRCUIT)
Are
voltage input at pin
(1)(3)(5)(7) of the E800 on
the PWB assembly
MAIN?
about 8Ω
0Ω or infinity
PWB assembly MAIN
Turn off
the projector and
disconnect the Speaker
cable from ESPL.Measure
the resistance of
the Speaker
.
(1): +13.2V
(3): +17V
(5): +6.6V
(7): +4.1V
ViewSonic Corporation
Co
nfidential
- Do Not Copy
P
J452
15