Sony SLV-772HF - Video Cassette Recorder User manual

US Model
SLV-779HF
Canadian Model
SLV-772HF/779HF
SERVICE MANUAL
VIDEO CASSETTE RECORDER
MICROFILM
S MECHANISM
SLV-772HF/ 779HF
RMT-V266
Refer to the SERVICE MANUAL ofVHS
MECHANICAL ADJUSTMENT for
MECHANICAL ADJUSTMENTS. (9-921-647-11)
SPECIFICATIONS
Photo: SLV-779HF
RMT-V266
G
j

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SAFETY-RELATED COMPONENT WARNING!!
COMPONENTS IDENTIFIED BY MARK !OR DOTTED LINEWITH
MARK !ON THE SCHEMATIC DIAGRAMS AND INTHE 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
À LA SÉCURITÉ!
LES COMPOSANTS IDENTIFÉS PAR UNE MARQUE !SUR LES
DIAGRAMMES SCHÉMATIQUES ET LA LISTE DES PIÈCES SONT
CRITIQUES POUR LA SÉCURITÉ DE FONCTIONNEMENT. NE
REMPLACER CES COMPOSANTS QUE PAR DES PIÈSES SONY
DONT LES NUMÉROS SONT DONNÉS DANS CE MANUEL OU
DANS LES SUPPÉMENTS PUBLIÉS 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 theareaofyour repairfor unsoldered or poorly-soldered
connections.Check the entire board surfacefor 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-operatedAC 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-operatedAC 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 passiveVOM that is suitable. Nearly all battery operated
digital multimeters that have a 2VAC range are suitable. (See
Fig. A)
To Exposed Metal
Parts on Set
0.15
µ F1.5 k
Ω
AC
Voltmeter
(0.75V)
Earth Ground
Fig.A. Using an AC voltmeter to check AC leakage.

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TABLE OF CONTENTS
SERVICE NOTE
1. ERROR CODE INDICATION ··········································· 4
1. GENERAL
Getting Started
Unpacking ···········································································1-1
Setting up the remote commander·······································1-1
Hookups ··············································································1-2
Selecting a language····························································1-8
Setting the clock ··································································1-9
Setting up the cable box control ········································1-10
Presetting channels ····························································1-12
Setting up the VCR Plus+ system ·····································1-14
Basic Operations
Playing a tape ····································································1-14
Recording TV programs ····················································1-15
Recording TV programs using theVCR Plus+ system ·····1-16
Setting the timer manually ················································1-17
Additional Operations
Playing/searching at various speeds··································1-18
Searching for a selected point on the tape·························1-18
Skip-searching automatically ············································1-19
Setting the recording duration time···································1-19
Checking/changing/canceling timer settings·····················1-19
Recording stereo and bilingual programs ·························1-20
Adjusting the picture ·························································1-20
Changing menu options·····················································1-21
Editing with another VCR ·················································1-21
Additional information
General setup information ·················································1-22
Index to parts and controls ················································1-22
2. DISASSEMBLY
2-1. CASE, FRONT PANEL BLOCK ASSEMBLY ··············2-1
2-2. MF-316 BOARD, DM-84 BOARD ································2-1
2-3. REAR PANEL·································································2-2
2-4. MA-341 BOARD ····························································2-2
2-5. MECHANISM DECK·····················································2-3
2-6. INTERNAL VIEWS························································2-4
2-7. CIRCUIT BOARDS LOCATION ···································2-5
3. BLOCK DIAGRAMS
3-1. OVERALL BLOCK DIAGRAM ····································3-1
3-2. VIDEO BLOCK DIAGRAM ··········································3-3
3-3. SERVO/SYSTEM CONTROL/TUNER
BLOCK DIAGRAM ·······················································3-5
3-4. AUDIO BLOCK DIAGRAM ··········································3-7
3-5. POWER BLOCK DIAGRAM·········································3-9
4. PRINTEDWIRING BOARDS AND
SCHEMATIC DIAGRAMS
4-1. FRAME SCHEMATIC DIAGRAM································4-3
4-2. PRINTED WIRING BOARDS AND SCHEMATIC
DIAGRAMS····································································4-5
• MA-341 (VUDEO, AUDIO, SERVO/SYSTEM
CONTROL, TUNER, POWER SUPPLY) PRINTED
WIRING BOARD ·······················································4-5
• MA-341 (1/7) (VIDEO) SCHEMATIC
DIAGRAM ··································································4-7
• MA-341 (2/7) (AUDIO) SCHEMATIC
DIAGRAM ··································································4-9
• MA-341 (3/7) (SERVO/SYSTEM CONTROL)
SCHEMATIC DIAGRAM·········································4-11
• MA-341 (4/7) (AUDIO PROCESS) SCHEMATIC
DIAGRAM ································································4-13
• MA-341 (5/7) (TUNER) SCHEMATIC
DIAGRAM ································································4-15
• MA-341 (6/7) (MODE CONTROL) SCHEMATIC
DIAGRAM ································································4-17
• MA-341 (7/7) (POWER SUPPLY) SCHEMATIC
DIAGRAM ································································4-19
• DM-84 (TAPE OPARATION) PRINTED
WIRING BOARD ·····················································4-22
• DM-84 (TAPE OPARATION) SCHEMATIC
DIAGRAM ································································4-22
• MF-316 (POWER/EJECT SWITCH)
SCHEMATIC DIAGRAM·········································4-23
• MF-316 (POWER/EJECT SWITCH) PRINTED
WIRING BOARD ·····················································4-24
5. INTERFACE, IC PIN FUNCTION
DESCRIPTION
5-1. SYSTEM CONTROL — MECHANISM BLOCK
INTERFACE (MA-341 BOARD IC160) ························5-1
5-2. SYSTEM CONTROL — SERVO PERIPHERAL
CIRCUIT INTERFACE (MA-341 BOARD IC160) ·······5-1
5-3. SYSTEM CONTROL — SYSTEM CONTROL
PERIPHERAL CIRCUIT INTERFACE
(MA-341 BOARD IC160)···············································5-2
5-4. SYSTEM CONTROL AND RF MODULATOR
— INPUT SELECTION BLOCK INTERFACE
(MA-341 BOARD IC160)···············································5-2
5-5. SYSTEM CONTROL — VIDEO/RP BLOCK
INTERFACE (MA-341 BOARD IC160) ························5-2
5-6. SYSTEM CONTROL — AUDIO BLOCK
INTERFACE (MA-341 BOARD IC160) ························5-2
5-7. SERVO/SYSTEM CONTROL MICROPROCESSOR PIN
FUNCTIONS (MA-341 BOARD IC160) ·······················5-3
6. ADJUSTMENTS
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.Set-up of Adjustment ·······················································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-341 Board) ·························6-2
2-3. SERVO SYSTEM CHECK ·············································6-3
2-3-1.RF Switching Position Adjustment
(MA-341 Board)······························································6-3
2-4. AUDIO SYSTEM ADJUSTMENT·································6-3
2-4-1.Hi-Fi Audio System Adjustment ·····································6-3
(Hi-Fi model only)···························································6-3
2-4-2.HiFi Switching Position Adjustment
(MA-341 Board)······························································6-4
2-4-3.Normal Audio System Adjustment ··································6-4
2-4-4.ACE Head Adjustment ····················································6-4
2-4-5.E-E Output Level Check ·················································6-4
2-4-6.Frequency Response Check·············································6-4
2-5. ADJUSTING PARTS LOCATION DIAGRAM ·············6-6
7. REPAIR PARTS LIST
7-1 EXPLODED VIEWS ······················································7-1
7-1-1.FRONT PANEL AND UPPER CASE SECTION ··········7-1
7-1-2.CHASSIS SECTION·······················································7-2
7-1-3.MECHANISM DECK SECTION-1 ·······························7-3
7-1-4.MECHANISM DECK SECTION-2 ·······························7-4
7-1-5.MECHANISM DECK SECTION-3 ·······························7-5
7-2. ELECTRICAL PARTS LIST ··········································7-6

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1. ERROR CODE INDICATION
• Error codes are indicated using the lower 5 digits in the fluorescent display tube.
“At this time, Colon “:” between character is not indicated.”
ERROR CODE
MODE CODE
0 Power-on eject 10 FWD x1 20 REW play
1 Power-on initial 11 FWD x2 21 Cas. loading
2 Power-off eject 12 CUE 22 Tape loading
3 Power-off stop 13 PB-pause 23 Power-off loading
4 FF 14 RVS-pause 24 Mecha. error (Power on)
5 REW 15 RVS x1 25 Power-on eject initial
6 REC 16 RVS x2 26 Power-off eject initial
7 REC- pause 17 REV 27 APC REC
8 Power-on stop 18 Power-off initial 28 Cas. loading
9 PB 19 Mecha. error (Power off) (No auto PB check)
0 No error
1 Cam encoder error Loading direction
2 Cam encoder error Unloading direction
3 T reel error
4 S reel error
5 Capstan error
6 Drum error
7 Error on initializing
8 Cassette loading error
9 Reserve
SERVICE NOTE
Mode code indication when the error has occurred.
Error code

1-1
SLV-772HF/779HF
SECTION 1
GENERAL This section is extracted from
instruction manual.

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