Check Method Of M-Net Transmission Power Board - Mitsubishi Electric City Multi PUMY-P36NHMU Technical & Service Manual

Check method of M-NET transmission power board

M-NET transmission power board check
Check the voltage between M1 and M2 on the
transmission terminal block TB3
24-30V DC ?
Yes
(24-30V DC )
Normal
Multi controller board
4 3 2 1
2 1
CN102
CNS1
(WHT)
(RED)
24V-30V DC (Non-polar)
TB3 M1 M2
To Indoor Unit
* To check the voltage of the parts on this board with a tester is difficult due to its location.
Test points are limited.
No
Is the incoming main voltage
208/230V ±10% AC ?
Disconnect the indoor - outdoor transmission wiring
from the terminal block TB3 , and check the voltage
between M1 and M2 on TB3 again.
*Check wiring
*Replace M-NET transmission power board
24V-30V DC
M-NET transmission power board
CN2
No
Yes
(208-230V AC )
24-30V DC ?
Yes
(24-30V DC )
No
65
*Check breaker and incoming power supply
*Check noise filter board
*Check wiring
*Correct the short circuit point on
the M-NET transmission line.
Noise filter
circuit board
NI
1
-
LI
3
CNAC1(WHT)
CN1
208/230V
±10% AC
208/230V
±10% AC
L2
L1
TB1