Hitachi RCUE40AG2 Service Manual page 136

Troubleshooting
Alarm code

[Alarm Stop Reason]
Communication between Ctrl PCB
(PCBc) and fan speed PCB is
not performed correctly during 30
seconds.
Is setting of Dip Switch
on Printed Circuit Board
for Fan Speed Control
(PCBH,PCBJ) is correct?
Yes
Is connector CN11 on the
Printed Circuit Board for
CPU (PCBC) correctly
connected?
Yes
Is connector CN 8 on
the Printed Circuit Board
for Fan Speed Control
(PCBH, PCBJ) correctly
connected?
Yes
Does fuse (EER, EFS1)
on the Printed Circuit
Board for Fan Speed
Control (PCBH, PCBJ)
have electricity?
Yes
Is 23V in the connector
PCN11 on the Printed
Circuit Board for Fan Speed
Control (PCBH, PCBJ)?
have electricity?
Yes
Is the voltage in the test
pattern on the Printed
Circuit Board for Fan Speed
Control (PCBH, PCBJ)?
VCC05 – GND 5V
pag. 134
SMGB0003 rev.0 - 01/2007
Error Communication between Ctrl. PCB and
[PCB Monitoring Position]
No
No
No
No
No
Is wiring of transformer
breaking?
No
No
Fan Speed control PCB
PCB (CPU PCB) CN11~ PCB
C
(Fan control PCB) CN8 ~ PCB
(Fan control PCB) CN8
Set Dip Switch correctly
Plug correctly and
Replace printed circuit
board for Relay (PCB
Replace the fuse
Yes
Replace the transformer
Wiring check, connector
Power circuit failure.
Replace the Printed
Circuit Board for Fan
Speed Control (PCBH,
H
J
repair wiring
)
D
check
PCBJ)