Mitsubishi Electric SD420U Service Manual page 8

Opereation function :
Remote control doesn't work.
Check
battery
level.
Normal
Check
remote
control.
Normal
Check PCB-IR
and
connector.
Normal
PCB-MAIN fail.
Abnormal
Replace battery.
Abnormal
Replace remote
control.
Abnormal
Replace PCB-IR.
Button doesn't work.
Check
top cover cable.
Normal
Check
button.
Normal
Check
PCB-KEYPAD.
Normal
Replace PCB-MAIN.
- 4 -
Abnormal
Replace cable or
connect the
cable back.
Abnormal
Replace button.
Abnormal
Replace
PCB-KEYPAD.