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STR-V200
SERVICE MANUAL
US Model
SPECIFICATIONS
— Continued on next page —
FM STEREO/FM-AM RECEIVER
MICROFILM
–1–
SAFETY CHECK-OUT
After correcting the original service problem, perform the following safety checks before releasing the set to the customer:
Check the antenna terminals, metal trim, “metallized” knobs, screws,
and all other exposed metal parts for AC leakage. Check leakage as
described below.
LEAKAGE
The AC leakage from any exposed metal part to earth Ground and
from all exposed metal parts to any exposed metal part having a
return to chassis, must not exceed 0.5 mA (500 microampers). Leakage current can be measured by any one of three methods.
1. A commercial leakage tester, such as the Simpson 229 or RCA
WT-540A. Follow the manufacturers’ instructions to use these
instruments.
2. A battery-operated AC milliammeter. The Data Precision 245
digital multimeter is suitable for this job.
3. Measuring the voltage drop across a resistor by means of a VOM
or battery-operated AC voltmeter. The “limit” indication is 0.75
V, so analog meters must have an accurate low-voltage scale.
The Simpson 250 and Sanwa SH-63Trd are examples of a passive VOM that is suitable. Nearly all battery operated digital
multimeters that have a 2V AC range are suitable. (See Fig. A)
To Exposed Metal
Parts on Set
0.15µF
1.5kΩ
AC
voltmeter
(0.75V)
Earth Ground
Fig. A. Using an AC voltmeter to check AC leakage.
Notes on chip component replacement
• Never reuse a disconnected chip component.
• Notice that the minus side of a tantalum capacitor may be
damaged by heat.
SAFETY-RELATED COMPONENT WARNING !!
COMPONENTS IDENTIFIED BY MARK ! OR DOTTED LINE
WITH MARK ! ON THE SCHEMATIC DIAGRAMS AND IN
THE PARTS LIST ARE CRITICAL TO SAFE OPERATION.
REPLACE THESE COMPONENTS WITH SONY PARTS
WHOSE PART NUMBERS APPEAR AS SHOWN IN THIS
MANUAL OR IN SUPPLEMENTS PUBLISHED BY SONY.
–2–
TABLE OF CONTENTS
1. SERVICING NOTE .......................................................... 3
4. EXPLODED VIEWS
2. GENERAL .......................................................................... 4
4-1. Case Section ........................................................................ 37
4-2. Chassis Section ................................................................... 38
3. DIAGRAMS
5. ELECTRICAL PARTS LIST ........................................ 39
3-1. Circuit Boards Location ........................................................ 6
3-2. Schematic Diagram – Main (1/3) Section – .......................... 7
3-3. Schematic Diagram – Main (2/3) Section – .......................... 9
3-4. Schematic Diagram – Main (3/3) Section – ........................ 11
3-5. Schematic Diagram – Display Section – ............................ 13
3-6. Schematic Diagram – Panel Section – ................................ 15
3-7. Printed Wiring Board – Main Section – .............................. 17
3-8. Printed Wiring Board – Power Section – ............................ 21
3-9. Printed Wiring Board – Display Section – .......................... 25
3-10. Printed Wiring Board – 10 Key Section – ........................ 29
3-11. Printed Wiring Board – Panel Section – ........................... 31
3-12. IC Pin Functions ............................................................... 33
3-13. IC Block Diagrams ........................................................... 35
SECTION 1
SERVICING NOTE
FACTORY SET
Mode which sets the preset settings of the unit to that at shipment.
Procedure:
While pressing the VIDEO button and TV/DBS button together, press the 1/u button to turn on the power.
“FACTORY” will be displayed and factory settings executed.
INITIALIZATION
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/DBS button, and TAPE/MD button together, press the 1/u button to turn on the power.
“INITIAL” will be displayed and initialization executed.
FLUORESCENT INDICATOR TUBE LIGHTING CHECK
Mode which lights up the whole fluorescent indicator tube or partially.
Procedure:
While pressing the TV/DBS 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.
SWITCHING OF 9 kHz/10 kHz AM CHANNEL STEP
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.
–3–
SECTION 2
GENERAL
Front Panel Descriptions
1
2