MICROFILM
STR-V200
SERVICE MANUAL
US Model
SPECIFICATIONS
FM STEREO/FM-AM RECEIVER
— Continued on next page —
– 1 –
SAFETY CHECK-OUT
0.15µF
To Exposed Metal
Parts on Set
1.5k
Ω
AC
voltmeter
(0.75V)
Earth Ground
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 A C 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 V OM
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)
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 DO TTED 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
2. GENERAL .......................................................................... 4
3. DIAGRAMS
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
4. EXPLODED VIEWS
4-1. Case Section........................................................................ 37
4-2. Chassis Section ................................................................... 38
5. ELECTRICAL PARTS LIST ........................................ 39
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 –
Front Panel Descriptions
SECTION 2
GENERAL
1
26
25
23
24
1 1/u button
2 VIDEO button
3 TV/DBS button
4 TAPE/MD button
5 CD button
6 TUNER button
7 BASS BOOST indicator
8 MASTER VOLUME knob
9 BALANCE knob
10 TREBLE knob
11 BASS knob
12 SURROUND ON/OFF button
13 SET UP button
14 EFFECT/DELAY TIME button
15 SURROUND MODE button
16 Numeral (1 to 0) button
17 Display window
18 DIRECT button
19 SHIFT button
20 MEMORY button
21 AM button
22 TUNING + button
23 FM button
24 TUNING – button
25 PHONES jack
26 SPEAKERS Ø ON/ø OFF button
20
3
465
17
16
782
12
1011131415
918192122
– 4 –
This section is extracted from
instruction manual.
– 5 –
3-1. CIRCUIT BOARDS LOCATION
SECTION 3
DIAGRAMS
SECONDARY board
STANDBY board
PRIMARY board
POWER SW board
KEY board
SPEAKER SW board
MAIN board
VOL-TONE board
DISPLAY board
THIS NOTE IS COMMON FOR PRINTED WIRING
BOARDS AND SCHEMATIC DIAGRAMS.
(In addition to this, the necessary note is printed
in each block.)
For schematic diagrams.
Note:
•All capacitors are in µF unless otherwise noted. pF: µµF
50 WV or less are not indicated except for electrolytics
and tantalums.
•All resistors are in Ω and
specified.
¢
•
•2: nonflammable resistor.
•C: panel designation.
Note:The components identified by mark ! or dotted line
•U: B+ Line.
•V: B– Line.
•Voltages and waveforms are dc with respect to ground
: internal component.
with mark ! are critical for safety.
Replace only with part number specified.
under no-signal (detuned) conditions.
no mark: FM
1
/4 W or less unless otherwise
WAVEFORMS
1
2
•Voltages are taken with a VOM (Input impedance 10 MΩ).
Voltage variations may be noted due to normal production tolerances.
•Waveforms are taken with a oscilloscope.
Voltage variations may be noted due to normal production tolerances.
•Circled numbers refer to waveforms.
•Signal path.
F : FM
For printed wiring boards.
Note:
•X: parts extracted from the component side.
•b: Pattern of the conductor side.
Caution:
Pattern face side: Parts on the pattern face side seen from
(Conductor Side) the pattern face are indicated.
Parts face side: Parts on the parts face side seen from
(Component Side)the parts face are indicated.
•Indication of transistor
C
EB
These are omitted
8MHz
IC300 @¢
4.8Vp-p
5.4Vp-p
4.19MHz
IC201 #¢ X1
– 6 –
3-2. SCHEMATIC DIAGRAM – MAIN (1/3) SECTION –
• See page 6 for Waveforms.
• See page 17 for Printed Wiring Board.
• See page 33 for IC Pin Functions.
• See page 35 for IC Block Diagrams.
STR-V200
(Page 15)
(Page 9)
(Page 11)
– 7 –
(Page 11)
(Page 13)
– 8 –
STR-V200
3-3. SCHEMATIC DIAGRAM – MAIN (2/3) SECTION –
• See page 17 for Printed Wiring Board.
• See page 35 for IC Block Diagrams.
(Page 16)
(Page 16)
(Page 8)
(Page 16)
(Page 11)
– 9 – – 10 –
3-4. SCHEMATIC DIAGRAM – MAIN (3/3) SECTION –
• See page 17 for Printed Wiring Board.
• See page 35 for IC Block Diagrams.
STR-V200
(Page 10)
(Page 8)
(Page 8)
– 11 – – 12 –
STR-V200
3-5. SCHEMATIC DIAGRAM – DISPLAY SECTION –
• See page 6 for Waveforms.
• See page 25 for Printed Wiring Board.
• See page 35 for IC Block Diagrams.
(Page 16)
(Page 7)
(Page 16)
(Page 15)
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