Checking Procedure For Main Parts; Ras-3Hvrc2; Checking Procedure For The Pcb - Hitachi UTOPIA RAS-4HVRP2E Service Manual

10 Troubleshooting

Checking procedure for main parts

10.4 Checking procedure for main parts

10.4.1 RAS-3HVRC2

10.4.1.1 Checking procedure for the PCB

Turn ON outdoor unit

LED 4 is ON?
Yes
DC310/340V (For power
supply circuit: 1~230V) is
applied to P1 and VDC-2.
*1)
Yes
DC280V system is normal
LED 1 is ON?
Yes
AC5V is applied between
VCC05 and GND1. *1
Yes
DC5V system is normal
DC13V is applied
between VCC12 and
GND1. *1
Yes
DC12V system is normal
DC15V is applied
between VCC15-1 and
VDC-2. *1
Yes
Check is completed.
Power circuit is normal.
?
N O T E
• *1) The following table shows the check points and the normal range of voltage in the case that the voltage on the outdoor unit PCB
is measured with a circuit tester. The setting of the circuit tester shall be set within the DC voltage measurement range when the fol-
lowing voltages are measured.
• *2) If 230V / 400V is present in DIP-IPM terminals R-S / R-S-T, DIP-IPM may be faulty. Alarm 03 may be shown in this case.
308 SMGB0136 rev.0 - 07/2021
No
Fuse PF1 / PF4 /EFR1 are
blowout
No
PCN406 is disconnected
No
No
DC310/340V (For power
supply circuit: 1~230V) is
applied to P1 and VDC-2.
*1)
No
No
AC5V is applied between
VCC05 and GND1. *1
No
No
No
No
Yes
Failure of AC Power Circuit of
OU PCB or fan motor
Yes
Connect PCN406.
Return to 
Yes
Voltage is normal.
LED4 is faulty
Failure of AC power circuit of
OU PCB or fan motor *2
Yes
Voltage is normal.
LED1 is faulty
Failure of DC power circuit of
OU PCB
Failure of DC power circuit of
OU PCB
Failure of DC power circuit of
OU PCB