Indoor Unit Circuit Board - Mitsubishi Electric PU(H)Y-P250YGM-A Service Handbook

[ IV Indoor Unit Components ]

[4] Indoor Unit Circuit Board

1. PFD-P250,P500VM-E models
(1) Indoor Control Board
CND
Power supply
input
(AC 220~240V)
F901
Fuse
CN2M
Indoor unit
transmission
line
CN3T
Power supply input
(from transformer)
(2) External Input/Output Circuit Board
TB23 (Input with voltage)
ON/OFF
CNT
CN33
Power supply output Lamp output
(to transformer)
CN90
Fan output
LED2
CN53
Indoor control board (No.1)
To CN51
TB21 (Input no voltage)
ON/OFF
CN3A
Remote controller connection
CN60
CNP
LEV output
Drain pump
output
CN24
Control signal
output
SW1,2,3,4
Dip switch
CN54
Indoor control board (No.2)
To CN51
TB22 (Relay contact output)
No.1 operation status
No.1 error status
No.2 operation status
No.2 error status
- 52 -
CN51
Switch input
CN31
Float switch input
Thermistor input
CN20
CN21
CN29
CN22
CN32
Switch input
LED1
SWC
Switching between
discharge/suction control