Friedrich SP12A10, SP10A10, SP08A10 When the Touch Key pad and Led Display, Troubleshooting

5-2-2 When the Touch Key pad and Led Display

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 ?(CN71, RY71)

(3)Is the connection of the assembly main PCB, and TOUCH KEY PAD in good contact? (SW01-SW05)

Turn off the power, and then turn it on again

five seconds later.

Troubleshooting

Normal operation

Check the micom (IC05) for a short, and replace it.

N	When the LED display is		When the membrane key is		N
	not operated.		not operated.
		Y		Y
N	Is the voltage of the micom		Is the voltage of the		N
	(IC05) No.1, 2, 38~43 port a		micom (IC05) No.13, 14 port
	square wave?		a square wave?

Normal operation

Check the micom (IC05) for a short, and replace it.

			Y		Y
				Is the voltage of the micom
Check the micom	N	Is the voltage of the micom				N
(IC05) for a short,		(IC05) No.3, 4, 10, 11, 44 port		(IC05) No.3, 4, 10, 11, 44
and replace it.		a square wave?		port a square wave?

Check the micom (IC05) for a short, and replace it.

Check the Q901~ Q905 for a short, and replace it.

Check the IC06 for a short, and replace it.

Y

NIs the voltage of the

Q901 ~ Q905 square wave?

Y

NIs the voltage of the

IC06 No. 10~16 a square

value?

Y

Replace the membrane

key pad.

Y

Replace the membrane key pad

FRIEDRICH AIR CONDITIONING CO. 5-3