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Q904, Q905, Q906
DB602
Q602
Because high voltage flows, be careful about electric shock. Also,be careful about short-circuit accidents
by improper connection of measuring instruments, which can damage the board.
3. Power Supply Circuit for Board
The voltage specification of the power supply circuit are as follow.
<Checking points>
Voltage
Output
Specifications
Name
Value
5V Output
12V Output
16V Output
B-12V
Output
When checking each voltage, if the voltage specifications above are met,the power supply circuit for the
board is functioning normally.
Q901, Q902, Q903
Q601
Main
Measurement Position
Load
Microcomputer
Tester(+)terminal:J96(5V indication)
Thermistor
Tester(-)terminal:J138(0V indication)
Microcomputer
Tester(+)terminal:J139(12V indication)
IC2,3 and 4
Tester(-)terminal:J138(0V indication)
Relay Circuit
Compressor Inverter
Tester(+)terminal:J111(16V indication)
Ciruit
Tester(-)terminal:J138(0V indication)
Fan Inverter Circuit
Tester(+)terminal:J133(B-12V indication)
Expansion Valve
Tester(-)terminal:J130(B-0V indication)
Smoothing Capacitor (C021, C022)
Example of failure mode for each output failure
The troubleshooting lamp LD301 does not
indicate and the outdoor unit does not operate.
The troubleshooting lamp LD301 does not
indicate and the outdoor unit does not operate.
The troubleshooting lamp LD301 blinks 3,4 or
12 times and the outdoor unit stops.
The troubleshooting lamp LD301 blinks 5 times
and the outdoor unit stops.
LD301
5P-TERMINAL
HIC PWB
(Reference)
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