Remote Control Troubleshooting - Mitsubishi Electric LT-3280 Service Manual

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