Panasonic SA-PT660 - Power Supply Block Diagram Analysis; Voltage Measurements and Defect Area Identification

Slide # 31
Models:
SA-PT660
SA-PT760
SA-PT960
SA-PT1060
SH-FX67, 85
Outline
Wireless
Mech
Pwr Supply
Protection
Audio
Power Supply Block for Stby, Pwr On, Isolation.
1. Output volt
@ w5713
2. FdBk volt
at w5711
Defect area
30Vdc 1.5Vdc Normal Operation
Lower than 30V Higher than 1.5V Reg circuit (IC5801, Q5802)
Lower than 30V Lower than 1.5V Output Stage (IC5701,
T5701, D5702)
Higher than 30V Higher than 1.5V Output Stage (IC5701,
T5701, D5702)
Higher than 30V Lower than 1.5V Reg circuit (IC5801, Q5802)
Dividing a PS problem to the
output or regulation stage
with 2 voltages.
Plug In, Power ON Sequence
1. Press Power ON
2. Fan turns on - Starts Noisy
3. Hello is displayed
4. Last Mode used is displayed.
1
2
Measure voltages. Look up voltages
on chart below for the defect area.