– 50 –
Is there DC20V (about) between
CN10 1 (blue-color) and
CN10 5 (red-color) under the
air-cond mode/high level wind?
Ye s
No
Is there DC5V between CN10
1 (blue-color) and CN10 3
(yellow color)?
Exchange indoor fan motor.
3. Only indoor fan is not working (others are normal).
Exchange REG3 after con-
firming there is no short circuit
on circuit board pattern.
Q904 collector has about 33Vp-
p pulse under air-cond mode
operating?
or Q904 collector has 0V
(about)?
The terminals of L901 is less
than 1
?
Exchange Q903.
Exchange L901.
PWM output (pin 57 ) is HI-
level, does it has pulse waves
in air-cond mode operating?
Exchange Q904.
Exchange micro-computer.
Make final checking of machine works.
4. Unable to change the wind level of indoor fan (others are normal).
Why fan is still running even
though one has press the stop
button of remote control unit.
Is PWM output (pin 57 ) of
micro-computer fan at HI-level?
Exchange micro-computer.
Collector of Q904 has about
0V?
Exchange Q904.
Exchange Q903.
Exchange micro-computer.
Make final checking when machine works.
Does pins 44 ~ 51 in micro-
computer has pulse wave in air-
cond operation with automatic
blowing?
5. Louver is not working (others are normal).
Exchange micro-computer.
Is there voltage 15V above
between REG2 I and REG2
G (12V line)?
Exchange REG1.
Exchange Louver motor if there
is nothing wrong with IC501.
Make final checking of machine works.
No
Ye s
No
No
Ye s
No
Ye s
Ye s Ye s
No
Ye s
No
Ye s
Ye s
No
No
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