Mitsubishi Electric LT-2220 Service Manual page 48

MODELS: LT-2220 / LT-2240 / LT-3020 / LT-3040 / LT-3050
2-4-1 (P*)
2-4-1 (P*)
YES
Problem is in IC100 or IC601 or IC500 or
IC400 (and peripheral circuits).
Are the specified voltages available at the
connectors below?
CN Pin No. Voltage
Name
A9V J190
A1.5V IC600
D1.5V IC600
A3.3V J190
D2.5V J190
D1.9V L400
AD3.3V J190
YES
Is the signal of 1.0Vp-p available at pin 2(V_out)
of J110,or pin 4 (SY_out) of J110?
Pin2 of J110
Pin4 of J110
YES
IC100 or IC601 or IC500 or IC400(and peripheral
circuits) are out of order.(PWB-MAIN)
(f=48KHz)
NO
10 9Vdc
3 1.5Vdc
3 1.5Vdc
5 3.3Vdc
8 2.5Vdc
- 1.9Vdc
6 3.3Vdc
1.0Vp-p
When the shown voltage is in
problem, PWB including the power
supply circuit (and peripheral
circuits) is the following.
Voltage PWB including
with the circuit in
problem problem
A9V SET(SUB)
A1.5V MAIN
D1.5V MAIN
A3.3V SET(SUB)
D2.5V SET(SUB)
D1.9V MAIN
AD3.3V SET(SUB)
NO
IC701 or IC702 (PWB-
SET(SUB)) are out of order.