Trouble Shooting - Hitachi RAS-18G5 Service Manual

TROUBLE-SHOOTING
No cooling
Operates by setting the service
switch to forced cooling?
YES
Return the service switch to "Normal".
Set the remote controller to an
operation status and press the
cooling button.
Is the level LO (approx. 0.5V)
between driver IC501 pin
relay and 0V?
NO
Is voltage normal (approx. 280 ~
380V) at out put side of the DB201?
NO
Replace faulty P.W.B.
No operation at all.
*1
NO
1) Current fuse
2) Varistor
3) Power switch
4) Thermal fuse for
Terminal board
power
16
Power relay abnormal
YES
Compressor does not turn at LO.
Check the circuit board of
YES
*4 Wait for 3 minutes before forced
re-operation by the service switch.
*1 Before using the service switch, disengage
and engage the plug. Do not operate the
remote controller.
Check the following parts and replace if faulty
Remove and check the continuity across.
Check whether the appearance is blackish or not.
The resistance must be infi nite. *2
Check the continuity between contacts.
(102°C) Continuity across
check the electric parts and replace if abnormal.
*2 Before checking the varistor, detach a terminal.
control board
– 51 –
➝
If there is no continuity,
Replace Power relay
Replace faulty part