SLV-777HF, SLV-778HF, SLV-788HF - Sony VCR Service Manual (repair manual). Page 4

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1.

ERROR CODE INDICATION ··········································· 6

2.

HOW TO REPLACE A ROTARY UPPER DRUM
(777HF, 778HF MODEL) ·················································· 7

2-1.

HOW TO REMOVE A ROTARY UPPER DRUM ············ 7

2-2.

HOW TO ATTACH A NEW ROTARY
UPPER DRUM ··································································· 7

Getting Started

Unpacking ·············································································· 1-1
Setting up the remote commander ········································· 1-1
Hookups ················································································· 1-1
Selecting a language ······························································ 1-7
Setting the clock ···································································· 1-7
Setting up cable box control ·················································· 1-9
Presetting channels ······························································ 1-10
Setting up VCR Plus+ ·························································· 1-11

Basic Operations

Playing a tape ······································································· 1-12
Recording TV programs ······················································ 1-13
Recording TV programs using VCR Plus+ ························· 1-14
Setting the timer manually ··················································· 1-14

Additional Operations

Playing/searching at various speeds ···································· 1-15
Searching for a selected point on the tape ··························· 1-16
Skip-searching automatically ··············································· 1-16
Recording TV programs using the quick timer ··················· 1-16
Checking/changing/cancelling timer settings ······················ 1-17
Recording stereo and bilingual programs ···························· 1-17
Adjusting the picture ··························································· 1-18
Changing menu options ······················································· 1-18
Editing with another VCR ··················································· 1-18

Additional Information

General setup information ··················································· 1-19
Index to parts and controls ··················································· 1-19

2-1.

UPPER CASE,
FRONT PANEL BLOCK ASSEMBLY ·························· 2-1

2-2.

FR-138 BOARD, DM-80 BOARD ································· 2-1

2-3.

REAR PANEL ································································· 2-1

2-4.

POWER BLOCK, MA-327 BOARD (WITH S
MECHANISM DECK) ··················································· 2-2

2-5.

S MECHANISM DECK ················································· 2-2

2-6.

INTERNAL VIEWS ························································ 2-3

2-7.

CIRCUIT BOARDS LOCATION ··································· 2-4

3-1.

OVERALL BLOCK DIAGRAM ···································· 3-1

3-2.

VIDEO BLOCK DIAGRAM ·········································· 3-3

3-3.

SERVO/SYSTEM CONTROL BLOCK DIAGRAM ····· 3-5

3-4.

AUDIO BLOCK DIAGRAM ·········································· 3-7

3-5.

MODE CONTROL BLOCK DIAGRAM ······················· 3-9

3-6.

TUNER BLOCK DIAGRAM ······································· 3-11

3-7.

POWER SUPPLY BLOCK DIAGRAM ······················· 3-13

4-1.

FRAME SCHEMATIC DIAGRAM ································ 4-1

4-2.

PRINTED WIRING BOARDS AND
SCHEMATIC DIAGRAMS ············································ 4-3

• MA-327 (REC/PB AMP, VIDEO, SERVO/SYSTEM
 CONTROL, AUDIO, TUNER)

PRINTED WIRING BOARD ························· 4-3

• MA-327 (REC/PB AMP)

SCHEMATIC DIAGRAM ······························ 4-5

• MA-327 (VIDEO, NORMAL AUDIO)

SCHEMATIC DIAGRAM ······························ 4-8

• MA-327 (SERVO/SYSTEM CONTROL)

SCHEMATIC DIAGRAM ···························· 4-11

• MA-327 (ON SCREEN DISPLAY)

SCHEMATIC DIAGRAM ···························· 4-15

• MA-327 (AFM AUDIO)

SCHEMATIC DIAGRAM ···························· 4-17

• MA-327 (TUNER)

SCHEMATIC DIAGRAM ···························· 4-19

• MA-327 (POWER SUPPLY, AV BUS)

SCHEMATIC DIAGRAM ···························· 4-21

• FR-138 (MODE CONTROL)

PRINTED WIRING BOARD ······················· 4-23

• FR-138 (MODE CONTROL)

SCHEMATIC DIAGRAM ···························· 4-25

• DM-80 (OPERATION SWITCHES)

PRINTED WIRING BOARD AND
SCHEMATIC DIAGRAM ···························· 4-27

• JK-162 (LINE-2 IN)

PRINTED WIRING BOARD AND
SCHEMATIC DIAGRAM ···························· 4-28

• POWER BLOCK SR801 (SWITCHING REGULATOR)

PRINTED WIRING BOARD AND
SCHEMATIC DIAGRAM ···························· 4-29

• POWER BLOCK SR709 (SWITCHING REGULATOR)

PRINTED WIRING BOARD AND
SCHEMATIC DIAGRAM ···························· 4-31

5-1.

SYSTEM CONTROL —
MECHANISM BLOCK INTERFACE
(MA-327 BOARD IC160) ··············································· 5-1

5-2.

SYSTEM CONTROL —
SERVO PERIPHERAL CIRCUIT INTERFACE
(MA-327 BOARD IC160) ··············································· 5-1

5-3.

SYSTEM CONTROL — SYSTEM CONTROL
PERIPHERAL CIRCUIT INTERFACE
(MA-327 BOARD IC160) ··············································· 5-2

5-4.

SYSTEM CONTROL  AND RF MODULATOR—
INPUT SELECTION BLOCK INTERFACE
(MA-327 BOARD IC160) ··············································· 5-2

5-5.

SYSTEM CONTROL —
VIDEO/RP BLOCK INTERFACE
(MA-327 BOARD IC160) ··············································· 5-2

5-6.

SYSTEM CONTROL —
AUDIO BLOCK INTERFACE
(MA-327 BOARD IC160) ··············································· 5-2

5-7.

SERVO/SYSTEM CONTROL MICROPROCESSOR
(MA-327 BOARD IC160) ··············································· 5-3

6-1

MECHANICAL ADJUSTMENTS ································· 6-1

6-2.

ELECTRICAL ADJUSTMENTS ··································· 6-1

2-1.

PREPARATION BEFORE ADJUSTMENT ··················· 6-1

2-1-1. Equipment Required ························································ 6-1
2-1-2. Equipment Connection ···················································· 6-1
2-1-3. Input Signal Check ·························································· 6-1
2-1-4. Alignment Tape ······························································· 6-1
2-1-5. Input/Output Levels and Impedance ······························· 6-2
2-1-6. Adjustment Sequence ······················································ 6-2
2-2.

POWER SUPPLY CHECK ············································· 6-2

2-2-1. Output Voltage Check (MA-327 Board) ························· 6-2
2-3.

SERVO SYSTEM CHECK ············································· 6-3

2-3-1. RF Switching Position/

AF Switching Position Adjustments (MA-327 Board) ··· 6-3