STR-V220 - Sony Audio Service Manual (repair manual)

str-v220 service manual
Model
STR-V220
Pages
28
Size
2.63 MB
Type
PDF
Document
Service Manual
Brand
Device
Audio / S/M STR-V220 US 99
File
str-v220.pdf
Date

Read Sony STR-V220 Service Manual online

– 1 –
MICROFILM
US Model
SPECIFICATIONS
SERVICE MANUAL
FM STEREO/FM-AM RECEIVER
STR-V220
— Continued on next page —
– 2 –
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.
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  CHECK-OUT
After correcting the original service problem, perform the follow-
ing 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). Leak-
age 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 pas-
sive 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.
0.15
µ
F
To Exposed Metal
Parts on Set
1.5k
AC
voltmeter
(0.75V)
Earth Ground
– 3 –
TABLE OF CONTENTS
SECTION  1
SERVICING NOTE
1. SERVICING NOTE
.......................................................... 3
2. GENERAL
.......................................................................... 4
3. ELECTRICAL BLOCK CHECKING ......................
5
4. DIAGRAMS
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
FACTORY SET
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.
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/SAT  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/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.
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.
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. EXPLODED VIEWS
5-1. Case Section ........................................................................ 28
5-2. Chassis Section ................................................................... 29
6. ELECTRICAL PARTS LIST
........................................ 30
– 4 –
Front Panel Descriptions
SECTION 2
GENERAL
Location of Parts and Controls
1
1/u button
2
VIDEO button
3
TV/SAT button
4
TAPE/MD button
5
CD button
6
TUNER button
7
BASS BOOST indicator
8
MASTER VOLUME knob
9
BALANCE knob
7
8
2
3
4
6
5
1
16
17
10
11
13
14
15
12
9
18
19
21
22
23
24
25
20
10
TREBLE knob
11
BASS knob
12
SURROUND ON/OFF button
13
CENTER MODE 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
This section is extracted from
instruction manual.
Page of 28
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Download Sony STR-V220 Service Manual (Repair Manual)

Here you can read online and download Sony STR-V220 Service Manual in PDF. STR-V220 service manual will guide through the process and help you recover, restore, fix, disassemble and repair Sony STR-V220 Audio. Information contained in service manuals typically includes schematics / circuit diagrams, wiring diagrams, block diagrams, printed wiring boards, exploded views, parts list, disassembly / assembly, pcb.