Mitsubishi Electric MS-30SV-A1 Service Manual page 34

How to check mis-wiring
F
Outdoor unit does not work.
Yes
Make them sure.
1. Turn OFF the power supply and disconnect only terminal block 3 of in-out
connecting wire on indoor side.
2. Short-circuit terminal block N-3 by lead wire.
3. Turn ON the power supply and press once EMERGENCY OPERATION switch.
Start
• Turn ON the power supply.
• Press once EMERGENCY OPERATION switch.
After 3 minutes, mis-wiring is indicated
(0.5-second ON, 0.5-second OFF)
on OPERATION INDICATOR
lamp on indoor unit.w
Is this mis-wiring, poor contact,
or wire disconnection?
No
Is there 1V DC between both ends of
PS132 on the indoor electronic control P.C.
board ?
( By tester, the stylus is between 0 ~ 1V. )
Yes
• Turn OFF the power supply.
• Disconnect the lead wire that terminal
block N-3 is short-circuited.
• Connect ON in-out connecting wire.
Turn ON the power supply.
Is there 240V AC between L-N on the
outdoor terminal block?
Yes
Is there 5V DC between J101 + -J401 - ?
(Refer to page 38.)
Yes
During EMERGENCY OPERATION,
is there 10V DC between both ends
of R601? (Refer to page 38.)
(By tester, the stylus is between 5 ~10V)
Yes
Replace the deicer P.C. board.
w Short circuit of JPG and JPS on the indoor electronic control
P.C. board enables self -check to be displayed in 3 seconds.
No
Replace the indoor electronic
control P.C. board.
No
Check the outdoor power supply
and connection of wiring.
No
Replace the deicer P.C. board.
Make the wiring between CN730
No
on the deicer P.C. board and
outdoor terminal block correct.
(Refer to page 38.)
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