Sony SLV-L56AR User manual

MICROFILM
SERVICE MANUAL
Argentina Model
VIDEO CASSETTE RECORDER
SLV-L56AR/L76HFAR/L86HFAR
RMT-V247E/V247F
SPECIFICATIONS
G
S MECHANISM
– Continued on next page –
* The abbreviations of L56, L76HF and L86HF contained in this service manual
are indicated when these models are common to all their corresponding mod-
els as given below.
L56AR
L56
Abbreviated
model name
All model
names
SLV- L76HFAR
L76HF
L86HFAR
L86HF
• Refer to the SERVICE MANUAL of VHS MECHANICAL
ADJUSTMENTS VI for MECHANICAL ADJUSTMENTS.
(9-921-647-11)
Photo: SLV-L86HFAR

– 2 –
SAFETY CHECK-OUT
1. Check the area of your repair for unsoldered or poorly-sol-
dered 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 transis-
tors, that were installed during a previous repair. Point them
out to the customer and recommend their replacement.
After correcting the original service problem, perform the following
safety checks before releasing the set to the customer:
4. Look for parts which, though functioning, show obvious signs
of deterioration. Point them out to the customer and recom-
mend their replacement.
5. Check the B+ voltage to see it is at the values specified.
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 PUB-
LISHED BY SONY.
• Feature Difference
SLV- L56 L76HF L86HF
FEATURE
HEAD/CH 4/4 4/6 4/6
RCA FRONT LINE IN GG®(3P)
CLICK SHUTTLE GG®
REMOTE COMMANDER RMT- V247E V247F V247F

– 3 –
Feature Difference ................................................................... 2
SERVICE NOTE ...................................................................... 4
1. GENERAL
Getting Started .............................................................. 1-1
Basic Operations ........................................................... 1-6
Additional Operations.................................................... 1-9
Editing............................................................................ 1-12
Additional Information ................................................... 1-14
2. DISASSEMBLY
2-1. Upper Case Removal.................................................... 2-1
2-2. Rear Panel Removal ..................................................... 2-1
2-3. Power Block Removal ................................................... 2-1
2-4. Front Panel Section Removal ....................................... 2-1
2-5. Mechanism Deck Removal ........................................... 2-2
2-6. MA-323 Board Removal................................................ 2-2
2-7. Internal Views ................................................................ 2-3
2-8. Circuit Boards Location ................................................. 2-4
3. BLOCK DIAGRAMS
3-1. Overall Block Diagram .................................................. 3-1
3-2. Video (1) Block Diagram ............................................... 3-4
3-3. Video (2) Block Diagram ............................................... 3-5
3-4. Servo/System Control Block Diagram .......................... 3-7
3-5. Audio Block Diagram..................................................... 3-9
3-6. Tuner Block Diagram..................................................... 3-11
3-7. Mode Control Block Diagram ........................................ 3-13
3-8. Power Block Diagram.................................................... 3-15
4. PRINTED WIRING BOARDS AND
SCHEMATIC DIAGRAMS
4-1. Frame Schematic Diagram ........................................... 4-3
4-2. Printed Wiring Boards and Schematic Diagrams ......... 4-5
MA-323 Printed Wiring Board ....................................... 4-5
MA-323 (Head Amp) Schematic Diagram .................... 4-9
MA-323 (Video, Audio) Schematic Diagram ................. 4-11
MA-323 (System Control) Schematic Diagram ............ 4-17
MA-323 (Servo Control) Schematic Diagram ............... 4-19
MA-323 (Hi-Fi Audio) Schematic Diagram.................... 4-21
MA-323 (IO) Schematic Diagram.................................. 4-23
MA-323 (Tuner) Schematic Diagram ............................ 4-25
MA-323 (Mode Control) Schematic Diagram ............... 4-27
MA-323 (FL Driver) Schematic Diagram....................... 4-29
MA-323 (Power Supply) Schematic Diagram ............... 4-31
DM-76, MF-312 Printed wiring Boards and
Schematic Diagrams ..................................................... 4-33
HS-921SF1 Printed Wiring Board................................. 4-35
HS-921SF1 (Power Supply) Schematic Diagram......... 4-37
SR-708 Printed Wiring Board ....................................... 4-39
SR-708 (Power Supply) Schematic Diagram ............... 4-41
5. INTERFACE, IC PIN FUNCTION DESCRIPTION
5-1. System Control-Video Block Interface
(MA-323 board IC161) .................................................. 5-1
5-2. System Control-Servo Peripheral Circuit Interface
(MA-323 board IC161) .................................................. 5-1
5-3. System Control-Mechanism Block Interface
(MA-323 board IC161) .................................................. 5-2
5-4. System Control-Audio Block Interface
(MA-323 board IC161) .................................................. 5-3
5-5. Servo/System/Timer/Tuner Control Microprocessor
Pin Function (MA-323 board IC161)............................. 5-4
6. ERROR CODES ....................................................... 6-1
7. ADJUSTMENTS
7-1. Mechanical Adjustments ............................................... 7-1
7-2. Electrical Adjustments ................................................... 7-1
2-1. Pre-Adjustment Preparations........................................ 7-1
2-1-1. Instruments to be Used............................................ 7-1
2-1-2. Connection ............................................................... 7-1
2-1-3. Set-up of Adjustment................................................ 7-1
2-1-4. Alignment Tape......................................................... 7-1
2-1-5. Specified I/O Level and Impedance......................... 7-1
2-1-6. Adjusting Sequence ................................................. 7-2
2-2. Power Supply Adjustment ............................................. 7-2
2-2-1. Power Supply Check................................................ 7-2
2-2-2. +6V Adjustment ........................................................ 7-2
2-3. Servo System Adjustment............................................. 7-2
2-3-1. RF Switching Position Adjustment........................... 7-2
2-4. Audio System Adjustments ........................................... 7-3
2-4-1. Hi-Fi Audio System Adjustment ............................... 7-3
1. AF Switching Position Adjustment ........................... 7-3
2. Frequency Response Check.................................... 7-3
3. Overall Level Characteristic and Distortion
Factor Check ............................................................ 7-4
4. Overall S/N Check .................................................... 7-4
2-4-2. Normal Audio System Adjustment ........................... 7-4
1. ACE Head Adjustment ............................................. 7-4
2. E-E Output Level Check .......................................... 7-4
3. Frequency Responce Check.................................... 7-4
4. Overall Level Characteristic and Distortion
Factor Check ............................................................ 7-5
5. Overall S/N Check.................................................... 7-5
2-5. Tuner System Adjustment ............................................. 7-5
2-5-1. Separation Adjustment............................................. 7-5
2-6. Parts Arrangement Diagram for Adjustments ............... 7-6
8. REPAIR PARTS LIST
8-1. Exploded Views ............................................................. 8-1
8-1-1. Front Panel and Cabinet Assemblies ...................... 8-1
8-1-2. Chassis Assembly .................................................... 8-2
8-1-3. Mechanism Chassis Assembly (1)........................... 8-3
8-1-4. Mechanism Chassis Assembly (2)........................... 8-4
8-1-5. Mechanism Chassis Assembly (3)........................... 8-5
8-2. Electrical Parts List........................................................ 8-6
TABLE OF CONTENTS
Section Title Page Section Title Page

– 4 –
SERVICE NOTE
1. DISASSEMBLY
• This set can be disassembled in the order shown below.
Note: Pages in indicated pages in the SERVICE MANUAL.
Pages in indicated pages in the VHS MECHANICAL ADJUSTMENT MANUAL VI.
Set
Upper case
(Page 2-1)
Front Panel
Section
(Page 2-1)
Power
Block
(Page 2-1)
Pinch Press
Block Ass’y
(Page 14)
Ground Shaft
Ass’y
(Page 13)
Mechanism
Deck
(Page 2-2)
FL Complete
Ass’y
(Page 13)
Drum
Ass’y
(Page 13)
Rear
Panel
(Page 2-1)
Rubber
Belt
(Page 15)
Rubber
Belt
(Page 15)
Slider
(Page 26)
Loading
Gear (T, S)
(Page 28)
Retainer
Plate
(Page 22)
MA-323
Board
(Page 2-2)
Rubber
Belt
(Page 15)
Capstan
Motor
(Page 15)
FL Slider
Block Ass’y
(Page 22)
Rotary
Switch
(Page 2-2) Tuner
Unit
Pully Gear
Ass’y
(Page 29)
Cam Motor
Retainer
(Page 31)
Cam Gear
(Page 23)
Cam Motor
(Page 31)
Reel Direct
Ass’y
(Page 30)

1-1
SECTION 1
GENERAL This section is extracted from instruction
manual (3-866-973-11).
SLV-L56/L76HF/L86HF

1-2

1-3

1-4

1-5

1-6

1-7

1-8

1-9

1-10

1-11

1-12

1-13

1-14

1-15
1-15 E

2-1
Note: Follow the disassembly procedure in the numerical order given.
2-1. UPPER CASE REMOVAL 2-3. POWER BLOCK REMOVAL
2-2. REAR PANEL REMOVAL 2-4. FRONT PANEL SECTION REMOVAL
SECTION 2
DISASSEMBLY
SLV-L56/L76HF/L86HF
1Two tapping screws
2Two tapping screws
3Upper case
2Harness
6Two claws
5Three claws
3Claw
4Claw
(L76HF/L86HF)
7Rear panel
1Power cord
4Power block
1Connector
(CN600)
3Screw
(B3)
2Screw
(B3)
2Flat cable
(CN105)
1Flat cable
(CN424)
4Three claws
5Three claws
6Front panel section
L86HF
3Connector
(CN423)