Hitachi C11XM25, Service Manual

Page: 16 / 72

16
CP-X444(C11XMB)/CP-X440(C11XM25)
PWB assembly Main
Check at operating mode
(Make sure the state of MUTE and Volume)
No sound
NO
YES
NO
YES
PWB assembly INPUT
Power unit (circuit)
Are
signal input
at each check-rounds on
the PWB assembly
Main?
infinity
about 8
Speaker
Disconnect
the speaker from the
PWB assembly Main, and
measure its
resistance.
Are voltage input
at each pin on the PWB
assembly Main?
TP080 : Audio (L)
TP086 : Audio (R)
: +17V
: +15.0V
: +6.0V
: +4.1V E800
E800
E800
E800
1
4
6
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
NO
YES
Use cross cable
Check the
RS-232C cable.
Are pin No. 2 and 3
crossed?
PWB assembly Main
NO
YES
Power unit (circuit)
Check the
power supply voltage
of E800 the voltage
correct?
: +17V
: +15.0V
: +6.0V
: +4.1V E800
E800
E800
E800
1
4
6
7
PWB assembly INPUT
NO
YES
Are the
signals input at each
check-round and resistor on
the PWB assembly
Main?
: RX
: TX TP081
R220