Hitachi YUTAKI Series - Page 202

Troubleshooting
Service Manual
200
Troubleshooting procedure
SMGB0066 rev.0 - 12/2009
 
8

• ThealarmcodeisdisplayedonthePCB´sdisplay.
– This alarm code is displayed when the low pressure sensor is short circuited or cut.

Is the high pressure sensor
correctly connected to
connectorCN4onthePCB1?
No
Yes
Yes
No
Is low pressure sensor
output character and high
pressure sensor display value
"Pd" proper during compressor
stop?.(Seetableabout
sensor characteristics)
Is the voltage between
VCC05T and GND1 on
PCB15V?
(Refer to voltage test position)
Yes
No
Failure of power supply circuit
on PCB1. Replace PCB1.
Wiringcheck,Repair.
(Breakingofwire,wrongwiring)
Failure of low pressure sensor.
Replace low pressure sensor.
Failure of component on PCB1.
Replace PCB1.
Is the low pressure sensor
correctly connected to
connectorCN3onthePCB1?
No
Yes
Wiringcheck,Repair.
(Breakingofwire,wrongwiring)

DCV
1 2 3
CN3
Pressure (MPa)
Output
(PCB1)
Low Pressure Sensor
(0~5V) Voltage meter
Red
(+Power
Supply)
White (Out)
Black (Gnd)