Friedrich SP05A10 service manual Troubleshooting by Symptom, No power

5-2 Troubleshooting by Symptom

5-2-1 No power

1)Check points

(1)Is the voltage of the power source normal ? (the rating voltage ±10% range.)

(2)Is the electric wire in good contact ?(CN 71, RY 71)

(3)Is the output voltage of the IC01(KA 7812) normal ?(DC 11.5V ~ DC 12.5V)

(4)Is the output voltage of the IC02(KA 7805) normal ?(DC 4.5V ~ DC 5.5V)

Turn off the power, and then turn it on again five

seconds later.

		Y
Dose the buzzer sound, when the power on?
	N	Y
Check whether the "COOLING ICON" LED lamp is
on, and the operation starts when pressing the
ON/OFF button of the remocon.

N

Y

Is the F701(3.15A) fuse blown?

Normal operation.

Normal operation.

Replace the fuse.

N

Is the primary voltage of the transformer normal?

N

(the rating voltage ±10% range.)

Check the power cord and electric wire.

Y

Is the secondary voltage of the transformer normal?

(AC 13V ~ AC 17V)

Y

Is the rectifier diode bridge(BD61) normal?

Y

-Is the voltage of DC 17V ~ DC 23V applied at both ends of the C101 electrolytic condenser?

-Is the voltage of DC 12V applied at both ends of the C102 electrolytic condenser?

-Is the voltage of DC 5V applied at both ends of the C103 electrolytic condenser?

N

N

N

Check and replace the trans.

•Check the BD61 for cold soldering.

•Replace the rectifier diode

•Check both ends of the C101 for short and cold soldering.

•Check the +12V for a short.

•Check the +5V for a short.

•Check and replace the C101~104.

Y

N

Are the IC01(KA7812) or IC02(KA7805) normal?

Y

Replace the assembly main PCB.

•Check the IC01 or IC02 for cold soldering and a short.

•Replace the IC01 or IC02.

5-2 FRIEDRICH AIR CONDITIONING CO.