Samsung MH026FPEA Training Manual page 105

Troubleshooting
8-4-3 Detailed Inspection Procedure
No Procedure
1
Pull out the power plug
from the AC terminal and
confirm the fuse on the
PCB assembly.
Turn the power on.
2
If lamp blinks trouble is
not related to the items
1 through 4 on the right.
Set TURBO operating
3
mode when RMC switch
pushed after a delay of
3 minutes
(A-unit and B-unit)
4 Set operating mode when
RMC switch pushed.
1. TURBO mode
5
Set operating mode
when RMC switch
pushed.
1. [FAN] mode
2. Fan speed [Hi]
3. Continuously operation
104
Inspection Method
1) Is the broken?
Voltage check
1) AC voltage at both end of transformer Primary?
the rating voltage ±10% range
2) AC voltage at both end of transformer secondary?
14~18Vac
3) DC voltage at OUT and GND of IC01
(KA7812)? 12VDC
4) DC voltage at OUT and GND of IC02? 5VDC
5) DC voltage at Q201 Base and GND change?
5) squarewave
Voltage check
1) Voltage of relay (RY71, 72, 73) coil Voltage at
pin #13, 14, 15 of IC07 : 12VDC
# and RY71 No #,
2) Voltage at RY72 No
RY72 No # and RY73 No #, the rating voltage
±10% range
1) Compressor does not operate.
1) Voltage at # % both ends of CN72 :
above 180V~
2) Indoor unit fan motor does not operate.
Cause
• Voltage over
• Indoor unit fan motor short-circuit.
• Irregular power code or power fuse,
or poor wiring.
• Transformer is faulty.
• Power circuit is faulty.
• Power circuit is faulty.
• Q201 is faulty.
• D101~D104 (IN4007)
• Relay(RY71) coil is open.
• IC6(KID65003A) is faulty.
• Relay contactor is faulty or Relay is faulty
• Temperature of Heat exchange is lower.
• PCB is faulty.
• Room sensor or Heat exchanger
temperature sensor is faulty
• Indoor unit fan motor is faulty.
• Poor connection of indoor fan motor and
connector of RPM sensing (CN44)
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