STR-V220 - Sony Audio Service Manual (repair manual). Page 3

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4-1. Circuit Boards Location ........................................................ 6
4-2. Schematic Diagram – Main (1/3) Section – .......................... 7
4-3. Schematic Diagram – Main (2/3) Section – .......................... 9
4-4. Schematic Diagram – Main (3/3) Section – ........................ 11
4-5. Printed Wiring Board – Main Section – .............................. 13

Mode which sets the preset settings of the unit to that at shipment.

Procedure:
While pressing the  VIDEO  button and  TV/SAT  button together, press the  

1/u  button to turn on the power.

“FACTORY” will be displayed and factory settings executed.

Mode which erases all the preset settings of the unit.
Use this mode when returning the unit to the customer.

Procedure:
While pressing the  VIDEO  button,  TV/SAT  button, and  TAPE/MD  button together, press the  

1/u  button to turn on the power.

“INITIAL” will be displayed and initialization executed.

Mode which lights up the whole fluorescent indicator tube or partially.

Procedure:
While pressing the  TV/SAT  button and  TAPE/MD  button together, press the  

1/u  button to turn on the power.

The fluorescent indicator tube will light up in about 0.5 seconds, and then start to light up partially. After partial lighting completes, the
BASS BOOST  indicator will light up, “FINISH” will be displayed, indicating that fluorescent indicator tube lighting check has completed.

The AM channels of this unit can be switched between 9 kHz and 10 kHz.

Procedure:
Set FUNCTION to AM and turn off the power.
While pressing the  TUNING +  button, press the  

1/u  button to turn on the power.

“9 k STEP” or “10 k STEP” will be displayed, and the channel step will be switched.

4-6. Printed Wiring Board – Display Section – .......................... 15
4-7. Schematic Diagram – Display Section – ............................ 17
4-8. Schematic Diagram – Panel Section – ................................ 19
4-9. Printed Wiring Board – Panel Section – .............................. 21
4-10. IC Block Diagrams ........................................................... 23
4-11. IC Pin Functions ............................................................... 26

5-1. Case Section ........................................................................ 28
5-2. Chassis Section ................................................................... 29

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