Hitachi ED-A110A1DN Service Manual page 19

No sound
Disconnect
the speaker from the
PWB assembly Main and
measure its
resistance.
about 16
PWB assembly Main
Can not control to RS-232C
Check the
RS-232C cable.
Are pin No. 2 and 3
crossed?
YES
Are the
signals input at each
pins on the Cable?
Pin
Pin
NO
Make sure PC setup
CP-A100 / ED-A100 / ED-A110 (A1DN)
Check at operating mode
(Make sure the state of MUTE , Volume and AUDIO-SPEAKER)
infinity
PWB assembly INPUT
NO
Use cross cable
YES
PWB assembly MAIN
: RX
: TX
PWB assembly INPUT
19
Speaker
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.