Samsung AW0503B Service Manual page 23

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 MEMBRANE KEY PAD(CN91)
(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?
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
Does the X-TAL(RJ 455JB) oscillate normally?
Is the collector voltage of the remocon QT1, QT2
a square wave?
Is the input voltage of the micom(IC04) No.15
pin of the assembly main PCB a aquare wave?
Replace the assembly main PCB.
5-4
Y
N
DC 2.7V?
Y
Y
Y
Y
N
Go to the clause "No power".
Y
The remocon is normally operated.
N
Replace the battery.
• Check the X-TAL for cold soldering
N
and a short.
• Replace relevant components.
N
• Check the micom(ICT1) QT1, and
QT2 for cold soldering and a short.
• Replace relevant components.
• Check the R415 components.
N
• Check the assembly main PCB
micom(IC04).
Samsung Electronics