Mitsubishi Heavy Industries SRK20HD-S Technical Manual page 39

(5) Inspection procedures of indoor electrical equipment
Is fuse (3.15A) blown?
YES
Is voltage applied between
terminals 1~2 on terminal
block? (AC 220/230/240V)
YES
Is DC 0~12V detected between
terminals 2~3 on terminal
block?
YES
Indoor electrical equipment
are normal.
Notes (1) Since the communication timing signal is transmitted only when the 52C is turned ON, check it under the operating condition.
(2) Check the voltage on the terminal block.
¡ Power supply: Between 1~2 (AC 220/230/240V)
¡ Signal: Between 2~3 (Changing between DC 0~Approx. 12V)
(6) How to make sure of remote controller
(1)
Is remote
controller
normal?
YES
Again pushing
operating switch
Operating the unit?
NO
Does backup
switch operates?
Operating the unit.
NO
Control problem on
indoor unit
Replace the display.
Is the unit
operable with remote
controller?
Defective remote
controller
NO
Replace fuse.
NO
Replace PCB.
NO
Replace PCB.
NO
Remote controller
defects
YES
Abnormality is not
found.
YES
YES
NO
Note (1) Check method of remote controller
(a) Press the reset switch of the remote controller.
(b) If all LCD are displayed after zero (0) display, it is basically normal.
AUTO
MED
Normal
37
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HI POWER ECONO
AM PM
HI
LO
ON OFF