ViewSonic PJ1158-1 Service Manual page 20

the speaker from the
PWB assembly Main and
PWB assembly Main
Can not control to RS-232C
Check the
RS-232C cable.
Are pin No. 2 and 3
crossed?
Are the
signals input at each
pins on the CONTROL
Port?
Make sure PC setup
ViewSonic Corporation
No sound
Check at operating mode
(Make sure the state of MUTE , Volume and AUDIO-SPEAKER)
Disconnect
measure its
resistance.
about 8
NO
YES
YES
Pin : RX
Pin : TX
NO
infinity
Speaker
PWB assembly INPUT
Use cross cable
PWB assembly MAIN
PWB assembly CONTROL
17
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.
Confidential - Do Not Copy
PJ1158-1