Service manual

Page 42
MODELS: LT-3280D/LT-3780D
4. Other faults4. Other faults
4. Other faults4. Other faults
4. Other faults
Notes) It considers the case where there are problems except 1, 2, 3.
4-1. Remote control is not effective.4-1. Remote control is not effective.
4-1. Remote control is not effective.4-1. Remote control is not effective.
4-1. Remote control is not effective.
After checking the polarity of batteries, has
it loaded correctly?
Does it use within 20 feet?
Load the batteries, making sure the
polarities (-) and (+) are correct.
Regarding as the slide switch at the top of
the remote, does it set as “TV”?
YES
NO
NO
YES
YES
YES
NO
It sets the slide switch as “TV”.
it uses within 20 feet.
It does not operate, even if it exchanges for
new batteries.
NO
It exchanges on new batteries.
YES
When it pushes the remote switch, is the
signal below available at pin 8,6, of MB
(remote switch use) ?
NO
5Vdc 6
8:
3Vp-p
Problem is in the following
PWB (and peripheral circuits).
Pin with
problem
PWB
including
the circuit
in problem
8 of MB
LED
6 of MB
MAIN or
POWER
Problem is in IC700 or their peripheral
circuits.
Please exchange PWB-MAIN