Hitachi RAF-25FX8 Service Manual page 154

2. Indoor fan does not operate (others are normal)
Can the fan be stopped by remote
control?
No
3. Air deflector does not move (others are normal)
Are pulse signals output at
microcomputer pins
15 18 -
Sweep 1], [Auto Sweep
19 22 -
2] when auto swing is turned on
in the fan mode?
Yes
Is a voltage over 15 or below 10V
being generated on the 12V line?
No
Yes
The microcomputer fan PWM
output (at pin
Perform final operation check.
No
[Auto
Yes
Perform final operation check.
) is 1 - 5V.
40
No
Replace IC111.
– 172 –
Yes
Replace the microcomputer.
Replace the fan motor.
Replace the microcomputer.
Replace the microcomputer.
Check IC711. If it is normal,
replace the air deflector motor.