Hitachi YUTAKI Series - Page 201

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Troubleshooting procedure
SMGB0066 rev.0 - 12/2009
Troubleshooting
Service Manual
7
 


• ThealarmcodeisdisplayedonthePCB´sdisplay.
– This alarm code is displayed when the high pressure sensor is short circuited or cut.

Is the high pressure sensor
correctly connected to
connectorCN4onPCB1?
No
Yes
Yes
No
Is high pressure sensor
output character and low
pressure sensor display value
"Ps" 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 high pressure sensor.
Replace high pressure sensor.
Failure of component on PCB1.
Replace PCB1.

DCV
1 2 3
CN4
Pressure (MPa)
Output
(PCB1)
High Pressure Sensor
(0~5V) Voltage meter
Red
(+Power
Supply)
White (Out)
Black (Gnd)

note
In case that the low pressure is higher than 2.2 MPa, segment shows 2.2 MPa. -
In this case, connect a pressure gauge to high pressure check joint, check the pressure shown in the gauge. -