Hitachi CPX380W Service Manual page 16

PJ750-2
CP-X380W
16
No sound
Check at operating mode
Are these signals
NO
present at each pins on
the Drive PCB?
YES
CHV25 : Audio (L)
CHV33 : Audio (R)
Drive PCB Speaker
Cannot control to RS-232C
Check at operating mode
Are these
signals present at the
following pins of I306 on
the Drive PCB?
9
YES
13
Signal PCB
Signal PCB
Pin No RS-232C
1
2
3
6
SEL0
7
RTS
9
10
GND
12
13
RDP
14
TDP
NO
: RX
Drive PCB
: TX