Service manual

MODELS: LT-3280D/LT-3780D

Page 43

4-2. Button switch is not effective.4-2. Button switch is not effective.

4-2. Button switch is not effective.

Is the following harness connected correctly?

・ Between PWB-MAIN and PWB-

CONTROL

(MC)

Poor harness connection or

defective cable.

YES

When it pushes the button switch, is the

signal

below available at pins 2, 3, of MC ?

3Vp-p only when switch is not pushed.

Not 3V only when switch is pushed.

(It depends on switch)

YES

IC700 (and peripheral circuits) are out of order.(PWB-MAIN)

2, 3 :

Part on PWB-CONTROL is out

of order.