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Ñ 2 Ñ
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.ATTENTION AU COMPOSANT AYANT RAPPORT
Ë LA SƒCURITƒ!
LES COMPOSANTS IDENTIFƒS PAR UNE MARQUE ! SUR LES
DIAGRAMMES SCHƒMATIQUES ET LA LISTE DES PIéCES SONT
CRITIQUES POUR LA SƒCURITƒ DE FONCTIONNEMENT. NE
REMPLACER CES COMPOSANTS QUE PAR DES PIéSES SONY
DONT LES NUMƒROS SONT DONNƒS DANS CE MANUEL OU
DANS LES SUPPƒMENTS PUBLIƒS PAR SONY.
SAFETY CHECK-OUT
After correcting the original service problem, perform the following
safety checks before releasing the set to the customer.
1. Check the area of your repair for unsoldered or poorly-soldered
connections. Check the entire board surface for solder splashes
and bridges.
2. Check the interboard wiring to ensure that no wires are
"pinched" or contact high-wattage resistors.
3. Look for unauthorized replacement parts, particularly
transistors, that were installed during a previous repair. Point
them out to the customer and recommend their replacement.
4. Look for parts which, though functioning, show obvious signs
of deterioration. Point them out to the customer and
recommend their replacement.
5. Check the line cord for cracks and abrasion.
Recommend the replacement of any such line cord to the
customer.
6. Check the B+ voltage to see it is at the values specified.
7. Check the antenna terminals, metal trim, "metallized" knobs,
screws, and all other exposed metal parts for AC leakage.
Check leakage as described below.LEAKAGE TEST
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 0.5mA (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
TW-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 0.75V, 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
0.15
µF
1.5 k ½
AC
Voltmeter
(0.75 V)
Earth Ground
Fig. A. Using an AC voltmeter to check AC leakage.
Page 2
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TABLE OF CONTENTS
SERVICE NOTE
1. ERROR CODE INDICATION ááááááááááááááááááááááááááááááááááááááááááá 4
1. GENERAL
Getting Started
Unpacking ááááááááááááááááááááááááááááááááááááááááááááááááááá\
áááááááááááááááááááááááá 1-1
Setting up the remote commander ááááááááááááááááááááááááááááááááááááááá 1-1
Hookups ááááááááááááááááááááááááááááááááááááááááááááááááááá\
ááááááááááááááááááááááááááá 1-2
Selecting a language ááááááááááááááááááááááááááááááááááááááááááááááááááá\
ááááááááá 1-8
Setting the clock ááááááááááááááááááááááááááááááááááááááááááááááááááá\
ááááááááááááááá 1-9
Setting up the cable box control áááááááááááááááááááááááááááááááááááááááá 1-10
Presetting channels ááááááááááááááááááááááááááááááááááááááááááááááááááá\
ááááááááá 1-12
Setting up the VCR Plus+ system ááááááááááááááááááááááááááááááááááááá 1-14
Basic Operations
Playing a tape ááááááááááááááááááááááááááááááááááááááááááááááááááá\
ááááááááááááááááá 1-14
Recording TV programs ááááááááááááááááááááááááááááááááááááááááááááááááááá\
á 1-15
Recording TV programs using the VCR Plus+ system ááááá 1-16
Setting the timer manually áááááááááááááááááááááááááááááááááááááááááááááááá 1-17
Additional Operations
Playing/searching at various speeds áááááááááááááááááááááááááááááááááá 1-18
Searching for a selected point on the tape ááááááááááááááááááááááááá 1-18
Skip-searching automatically áááááááááááááááááááááááááááááááááááááááááááá 1-19
Setting the recording duration time ááááááááááááááááááááááááááááááááááá 1-19
Checking/changing/canceling timer settings ááááááááááááááááááááá 1-19
Recording stereo and bilingual programs ááááááááááááááááááááááááá 1-20
Adjusting the picture ááááááááááááááááááááááááááááááááááááááááááááááááááá\
áááááá 1-20
Changing menu options ááááááááááááááááááááááááááááááááááááááááááááááááááá\
áá 1-21
Editing with another VCR ááááááááááááááááááááááááááááááááááááááááááááááááá 1-21
Additional information
General setup information ááááááááááááááááááááááááááááááááááááááááááááááááá 1-22
Index to parts and controls áááááááááááááááááááááááááááááááááááááááááááááááá 1-22
2. DISASSEMBLY
2-1. CASE, FRONT PANEL BLOCK ASSEMBLY áááááááááááááá 2-1
2-2. MF-316 BOARD, DM-84 BOARD áááááááááááááááááááááááááááááááá 2-1
2-3. REAR PANEL ááááááááááááááááááááááááááááááááááááááááááááááááááá\
áááááááááááááá 2-2
2-4. MA-341 BOARD ááááááááááááááááááááááááááááááááááááááááááááááááááá\
ááááááááá 2-2
2-5. MECHANISM DECK ááááááááááááááááááááááááááááááááááááááááááááááááááá\
áá 2-3
2-6. INTERNAL VIEWS ááááááááááááááááááááááááááááááááááááááááááááááááááá\
ááááá 2-4
2-7. CIRCUIT BOARDS LOCATION ááááááááááááááááááááááááááááááááááá 2-5
3. BLOCK DIAGRAMS
3-1. OVERALL BLOCK DIAGRAM áááááááááááááááááááááááááááááááááááá 3-1
3-2. VIDEO BLOCK DIAGRAM áááááááááááááááááááááááááááááááááááááááááá 3-3
3-3. SERVO/SYSTEM CONTROL/TUNER
BLOCK DIAGRAM ááááááááááááááááááááááááááááááááááááááááááááááááááá\
áááá 3-5
3-4. AUDIO BLOCK DIAGRAM áááááááááááááááááááááááááááááááááááááááááá 3-7
3-5. POWER BLOCK DIAGRAM ááááááááááááááááááááááááááááááááááááááááá 3-9
4. PRINTED WIRING BOARDS AND
SCHEMATIC DIAGRAMS
4-1. FRAME SCHEMATIC DIAGRAM áááááááááááááááááááááááááááááááá 4-3
4-2. PRINTED WIRING BOARDS AND SCHEMATIC
DIAGRAMS ááááááááááááááááááááááááááááááááááááááááááááááááááá\
ááááááááááááááááá 4-5
¥ MA-341 (VUDEO, AUDIO, SERVO/SYSTEM
CONTROL, TUNER, POWER SUPPLY) PRINTED
WIRING BOARD ááááááááááááááááááááááááááááááááááááááááááááááááááá\
áááá 4-5
¥ MA-341 (1/7) (VIDEO) SCHEMATIC
DIAGRAM ááááááááááááááááááááááááááááááááááááááááááááááááááá\
ááááááááááááááá 4-7
¥ MA-341 (2/7) (AUDIO) SCHEMATIC
DIAGRAM ááááááááááááááááááááááááááááááááááááááááááááááááááá\
ááááááááááááááá 4-9
¥ MA-341 (3/7) (SERVO/SYSTEM CONTROL)
SCHEMATIC DIAGRAM ááááááááááááááááááááááááááááááááááááááááá 4-11
¥ MA-341 (4/7) (AUDIO PROCESS) SCHEMATIC
DIAGRAM ááááááááááááááááááááááááááááááááááááááááááááááááááá\
ááááááááááááá 4-13
¥ MA-341 (5/7) (TUNER) SCHEMATIC
DIAGRAM ááááááááááááááááááááááááááááááááááááááááááááááááááá\
ááááááááááááá 4-15¥ MA-341 (6/7) (MODE CONTROL) SCHEMATIC
DIAGRAM ááááááááááááááááááááááááááááááááááááááááááááááááááá\
ááááááááááááá 4-17
¥ MA-341 (7/7) (POWER SUPPLY) SCHEMATIC
DIAGRAM ááááááááááááááááááááááááááááááááááááááááááááááááááá\
ááááááááááááá 4-19
¥ DM-84 (TAPE OPARATION) PRINTED
WIRING BOARD ááááááááááááááááááááááááááááááááááááááááááááááááááá\
áá 4-22
¥ DM-84 (TAPE OPARATION) SCHEMATIC
DIAGRAM ááááááááááááááááááááááááááááááááááááááááááááááááááá\
ááááááááááááá 4-22
¥ MF-316 (POWER/EJECT SWITCH)
SCHEMATIC DIAGRAM ááááááááááááááááááááááááááááááááááááááááá 4-23
¥ MF-316 (POWER/EJECT SWITCH) PRINTED
WIRING BOARD ááááááááááááááááááááááááááááááááááááááááááááááááááá\
áá 4-24
5. INTERFACE, IC PIN FUNCTION
DESCRIPTION
5-1. SYSTEM CONTROL Ñ MECHANISM BLOCK
INTERFACE (MA-341 BOARD IC160) áááááááááááááááááááááááá 5-1
5-2. SYSTEM CONTROL Ñ SERVO PERIPHERAL
CIRCUIT INTERFACE (MA-341 BOARD IC160) ááááááá 5-1
5-3. SYSTEM CONTROL Ñ SYSTEM CONTROL
PERIPHERAL CIRCUIT INTERFACE
(MA-341 BOARD IC160) ááááááááááááááááááááááááááááááááááááááááááááááá 5-2
5-4. SYSTEM CONTROL AND RF MODULATOR
Ñ INPUT SELECTION BLOCK INTERFACE
(MA-341 BOARD IC160) ááááááááááááááááááááááááááááááááááááááááááááááá 5-2
5-5. SYSTEM CONTROL Ñ VIDEO/RP BLOCK
INTERFACE (MA-341 BOARD IC160) áááááááááááááááááááááááá 5-2
5-6. SYSTEM CONTROL Ñ AUDIO BLOCK
INTERFACE (MA-341 BOARD IC160) áááááááááááááááááááááááá 5-2
5-7. SERVO/SYSTEM CONTROL MICROPROCESSOR PIN
FUNCTIONS (MA-341 BOARD IC160) ááááááááááááááááááááááá 5-3
6. ADJUSTMENTS
6-1 MECHANICAL ADJUSTMENTS ááááááááááááááááááááááááááááááááá 6-1
6-2. ELECTRICAL ADJUSTMENTS ááááááááááááááááááááááááááááááááááá 6-1
2-1. PREPARATION BEFORE ADJUSTMENT ááááááááááááááááááá 6-1
2-1-1. Equipment Required ááááááááááááááááááááááááááááááááááááááááááááááááááá\
ááááá 6-1
2-1-2. Equipment Connection ááááááááááááááááááááááááááááááááááááááááááááááááááá\
á 6-1
2-1-3. Set-up of Adjustment ááááááááááááááááááááááááááááááááááááááááááááááááááá\
áááá 6-1
2-1-4. Alignment Tape ááááááááááááááááááááááááááááááááááááááááááááááááááá\
áááááááááááá 6-1
2-1-5. Input/Output Levels and Impedance ááááááááááááááááááááááááááááááá 6-2
2-1-6. Adjustment Sequence ááááááááááááááááááááááááááááááááááááááááááááááááááá\
ááá 6-2
2-2. POWER SUPPLY CHECK ááááááááááááááááááááááááááááááááááááááááááááá 6-2
2-2-1. Output Voltage Check (MA-341 Board) ááááááááááááááááááááááááá 6-2
2-3. SERVO SYSTEM CHECK ááááááááááááááááááááááááááááááááááááááááááááá 6-3
2-3-1. RF Switching Position Adjustment
(MA-341 Board) ááááááááááááááááááááááááááááááááááááááááááááááááááá\
ááááááááááá 6-3
2-4. AUDIO SYSTEM ADJUSTMENT ááááááááááááááááááááááááááááááááá 6-3
2-4-1. Hi-Fi Audio System Adjustment ááááááááááááááááááááááááááááááááááááá 6-3
(Hi-Fi model only) ááááááááááááááááááááááááááááááááááááááááááááááááááá\
áááááááá 6-3
2-4-2. HiFi Switching Position Adjustment
(MA-341 Board) ááááááááááááááááááááááááááááááááááááááááááááááááááá\
ááááááááááá 6-4
2-4-3. Normal Audio System Adjustment áááááááááááááááááááááááááááááááááá 6-4
2-4-4. ACE Head Adjustment ááááááááááááááááááááááááááááááááááááááááááááááááááá\
á 6-4
2-4-5. E-E Output Level Check ááááááááááááááááááááááááááááááááááááááááááááááááá 6-4
2-4-6. Frequency Response Check ááááááááááááááááááááááááááááááááááááááááááááá 6-4
2-5. ADJUSTING PARTS LOCATION DIAGRAM ááááááááááááá 6-6
7. REPAIR PARTS LIST
7-1 EXPLODED VIEWS ááááááááááááááááááááááááááááááááááááááááááááááááááá\
ááá 7-1
7-1-1. FRONT PANEL AND UPPER CASE SECTION áááááááááá 7-1
7-1-2. CHASSIS SECTION ááááááááááááááááááááááááááááááááááááááááááááááááááá\
áááá 7-2
7-1-3. MECHANISM DECK SECTION-1 ááááááááááááááááááááááááááááááá 7-3
7-1-4. MECHANISM DECK SECTION-2 ááááááááááááááááááááááááááááááá 7-4
7-1-5. MECHANISM DECK SECTION-3 ááááááááááááááááááááááááááááááá 7-5
7-2. ELECTRICAL PARTS LIST áááááááááááááááááááááááááááááááááááááááááá 7-6