10.2 Trouble shooting - Detailed for engineer
Trouble Checkup result Possible reasons Corresponding solution
Unavailable voltage at input part of
circuit board
The power supply coil isn’t plugged
well
Plug the supply coil properly
Damaged wave filtering component
Return to the controller manufacturer for
repair
Unavailable voltage at one end of
the fuse
Damaged fuse Replace with a good one
Unavailable output from the
consequent pole of transformer
The transformer isn’t plugged well or
is damaged
Plug the transformer well or replace with a
good one
Improper output of 7805
Damaged component on power
supply unit of indoor board
Return to the controller manufacturer for
repair
No response after
power being
connected
Normal power supply for major
chip
Damaged major chip
Return to the controller manufacturer for
repair
Damaged connection cable between
display board and indoor board
Replace with a good connection cable
Indicator lamps do not light
Connection cable between display
board and indoor board isn’t
connected well
Connect the cable well
Damaged reception adaptor Replace with a good one
Display board does
not make normal
response
Remote control cannot be received
Damaged remote circuit or major chip
Return to the controller manufacturer for
repair
Damaged dynatron Q1 Replace with a good one
Unavailable square wave signal at
wo ends of the buzzer
t
Damaged major chip
Return to the controller manufacturer for
repair
The buzzer does
not beep while
making remote
control
Available square signal at two
ends of the buzzer
Damaged buzzer Replace with a good one
No output from 2803 on indoor
board
Damaged 2803
Replace with a good 2803
Indoor blowing fan
does not run
Normal output of relays K1, JK2,
JK3
CN8 on indoor board is not plugged
well with connection cable
Connect connection parts well
No output at 16 pin of 2803 on
indoor board
Damaged 2803 Replace with a good 2803
Unavailable voltage on COM port
JK2 on indoor board
of relay
Damaged relay JK2 Replace with a good one
Indoor blowing fan
cannot not
generate low wind
No output at relay JK1 on indoor
board
Damaged relay JK1 Replace with a good one
DIAGNOSTIC INFORMATION (TROUBLE SHOOTING)
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