Mitsubishi Electric LT-2220 Service Manual page 50

MODELS: LT-2220 / LT-2240 / LT-3020 / LT-3040 / LT-3050
2-5-1 (P*)
2-5-1 (P*)
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
30V IC180
A9V J190
A1.5V IC600
D1.5V IC600
A3.3V J190
D2.5V J190
D1.9V L400
AD3.3V J190
YES
TU1A0 or IC100 or IC601 or IC500 or IC400 (and
peripheral circuits) are out of order. (PWB-MAIN)
NO
When the shown voltage is in
problem, PWB including the power
supply circuit (and peripheral
circuits) is the following.
7 30Vdc
10 9Vdc
3 1.5Vdc
3 1.5Vdc
5 3.3Vdc
8 2.5Vdc
- 1.9Vdc
6 3.3Vdc
3Vp-p
Voltage with PWB including
problem the circuit in
problem
30V MAIN
A9V SET(SUB)
A1.5V MAIN
D1.5V MAIN
A3.3V SET(SUB)
D2.5V SET(SUB)
D1.9V MAIN
AD3.3V SET(SUB)