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5-4 FRIEDRICH AIR CONDITIONING CO.
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.
Replace the assembly main PCB.
Dose the Buzzer sound, when the power on?
Check whether the "COOLING ICON" LED lamp is on
and th operation starts when pressing the
on/off button of the remocon.
Is the battery voltage of the remocon above
DC 2.7V?
Is the collector voltage of the remocon Q1, Q2
a square wave?
Does the X-TAL(RJ 455JB) oscillate normally?
Is the input voltage of the micom(IC05) No.15
pin of the assembly main PCB a aquare wave?
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.
• Check the R415 components.
• Check the assembly main PCB
micom(IC05).
N
Y
N
Y
Y
Y
Y
N
N
N
N
Y
DB98_04511A(2)-2 2/18/03 4:12 PM Page 5-4