Hitachi C11XMB Service Manual page 16

CP-X444(C11XMB)/CP-X440(C11XM25)
Are voltage input
at each pin on the PWB
at each check-rounds on
the PWB assembly
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?
YES
Are the
signals input at each
check-round and resistor on
the PWB assembly
Main?
TP081
R220
YES
PWB assembly INPUT
No sound
Check at operating mode
(Make sure the state of MUTE and Volume)
NO
assembly Main?
E800 : +17V
1
E800 : +15.0V
4
YES
E800 : +6.0V
6
E800 : +4.1V
Are
signal input
NO
Main?
TP080 : Audio (L)
TP086 : Audio (R)
YES
Disconnect
infinity
measure its
resistance.
about 8
NO
Use cross cable
Check the
NO
power supply voltage
of E800 the voltage
correct?
: RX
: TX
PWB assembly Main
16
Power unit (circuit)
PWB assembly INPUT
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.
NO
E800 : +17V
1
E800 : +15.0V
4
YES
E800 : +6.0V
6
E800 : +4.1V
7
Power unit (circuit)