Service manual

Page 36
MODEL: L423FR
4. Other faults
4-1. Remote control is not effective.
4-2. Side switch is not effective.
Load the batteries, making sure the
polarities (-) and (+) are correct.
YES
Does it use within 20 feet?
It sets the slide switch as “TV”.
NO
YES
it uses within 20 feet.
YES
YES
Is the following harness connected correctly?
・Between PWB-MAIN and PWB-CONTROL
(J303-J0A0)
NO
Poor harness connection or
defective cable.
YES
IC300 (and peripheral circuits)
are out of order.(PWB-MAIN)
When it pushes the side switch, is the signal
below available at pins 2, 3, of J303 ?
4, 5 :
YES
NO
YES
Problem is in the following
PWB (and peripheral circuits).
Pin with
problem
PWB
including
the circuit
in problem
8 of J303 IR
6 of J303 MAIN
Part on PWB-CONTROL is out
of order.
NO
When it pushes the remote switch, is the
signal below available at pin 8,6, of J303
(remote switch use) ?
3Vp-p
8:
6 5Vdc
3Vp-p only when switch is not pushed.
Not 3V only when switch is pushed.
(It depends on switch)
It exchanges on new batteries.
NO
It does not operate, even if it exchanges for
new batteries.
NO
Regarding as the slide switch at the top of
the remote, does it set as “TV”?
After checking the polarity of batteries, has
it loaded correctly?
NO
Problem is in IC300 or their peripheral
circuits.
Please exchange PWB-MAIN