Mitsubishi Electric MU-GE50VB, Руководство по обслуживанию

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How to check mis-wiring and serial signal error
During EMERGENCY OPERATION,
is there 10 V DC between both ends
of R601?
(By tester, the stylus is between 5 ~10 V)
Turn ON the power supply(outdoor unit).
Is there 230 V AC between outdoor terminal
block (TB1)?
No
Check the outdoor power supply
and connection of wiring .
Yes
Turn ON the power supply(indoor unit).
No
Replace the deicer P.C. board.
Yes
No
Make the wiring between CN730
on the deicer P.C. board and
outdoor terminal block correct.
Replace the deicer P.C. board.
Yes
Is there 5 V DC between J205 + –J101 - on the deicer P.C. board?
Start
No
No
Is there 20 V DC between both ends of
R132 on the indoor electronic control P.C.
board ?
( By tester, the stylus is between 0 ~ 20 V. )
• Turn ON the power supply. (indoor/outdoor unit)
• Press EMERGENCY OPERATION switch once.
Is this mis-wiring, poor contact,
or wire disconnection?
Correct them.
Replace the indoor electronic
control P.C. board.
Yes
Yes
After 3 minutes, mis-wiring is indicated
(0.5-second ON, 0.5-second OFF)
on OPERATION INDICATOR
lamp on indoor unit.
Short circuit of JPG and JPS on the indoor electronic control
P.C. board enables self -check to be displayed in 3 seconds.
• Turn OFF the power supply. (indoor unit)
• Connect indoor/outdoor connecting
wire.
1. Turn OFF the power supply (indoor/outdoor unit) and disconnect indoor and outdoor
connecting wire on indoor side.
2. Short-circuit terminal block
N
-
3
by lead wire.
3. Turn ON the power supply (indoor unit) and press EMERGENCY OPERATION switch once.
Refer to indoor unit service manual.
When OPERATION INDICATOR lamp flashes 0.5-second intervals.
Outdoor unit does not operate.