Friedrich SP05A10 service manual When the remocon is not operated

Troubleshooting

5-2-3 When the remocon is not operated

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 assembly main PCB in good contact with the TOUCH KEY PAD(SW01-SW05)

(4)Is the battery voltage of the remocon above DC 2.7V?

Turn off the power, and then turn it on

again five seconds later.

Dose the Buzzer sound, when the power on?

Y

Check whether the "COOLING ICON" LED lamp is on

and th operation starts when pressing the

on/off button of the remocon.

N

Is the battery voltage of the remocon above

DC 2.7V?

Y

Does the X-TAL(RJ 455JB) oscillate normally?

Y

Is the collector voltage of the remocon Q1, Q2 a square wave?

N

Y

N

N

N

Go to the clause "No power".

The remocon is normally operated.

Replace the battery.

•Check the X-TAL for cold soldering and a short.

•Replace relevant components.

•Check the micom(ICT1) Q1, and Q2 for cold soldering and a short.

•Replace relevant components.

Y

Is the input voltage of the micom(IC05) No.15	N
pin of the assembly main PCB a aquare wave?

Y

Replace the assembly main PCB.

•Check the R415 components.

•Check the assembly main PCB micom(IC05).

5-4 FRIEDRICH AIR CONDITIONING CO.