Sony SLV-798-HF Service manual

SLV-798HF/998HF

RTV servis Horvat

Kešinci, 31402 Semeljci 031-856-139 031-856-637 098-788-319

rtv-servis-horvat@os.tel.hr

Croatia

RMT-V229/V232C

SERVICE MANUAL

G j

• Refer to the SERVICE MANUAL of VHS MECHANICAL ADJUSTMENT (9-921-647-11)

for MECHANICAL ADJUSTMENTS.

Photo : SLV-998HF

SPECIFICATIONS

US Model

SLV-798HF/998HF

Canadian Model

SLV-798HF/998HF

Chilean Model

Mexican Model

PX Model

SLV-998HF

S MECHANISM

MICROFILM

VIDEO CASSETTE RECORDER

DIFFERENT SPECIFICATIONS

MODEL

SPECIFICATIONS

FLYING ERASE HEAD BODY COLOR REMOTE COMMANDER

SLV-798HF

—

BLACK

RMT-V232C

SLV-998HF

BUILT-IN

BLACK

RMT-V229

SAFETY-RELATED COMPONENT WARNING!!

COMPONENTS IDENTIFIED BY MARK ! OR DO TTED 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

À LA SÉCURITÉ! LES COMPOSANTS IDENTIFÉS P AR UNE MARQ UE ! SUR LES DIAGRAMMES SCHÉMA TIQUES 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.

— 2 —

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.

T o Exposed Metal

Parts on Set

0.15

1.5 k

Ω

Voltmeter (0.75 V)

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. F ollow the manufacturers' instructions to use these instruments.

2. A battery-operated A C 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 v oltmeter . The "limit" indication is 0.75V, so analog meters must have an accurate lo w v oltage 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 A C range are suitable. (See Fig. A)

Earth Ground

Fig. A. Using an A C v oltmeter to check A C leakage.

— 3 —

SERVICE NOTE

1. ERROR CODE INDICATION··········································· 6

2. HOW TO REPLACE A ROTARY UPPER DRUM ··········· 7 2-1. HOW TO REMOVE A ROTARY UPPER DRUM ············ 7 2-2. HOW TO ATTACH A NEW ROTARY UPPER DRUM ···· 7

1. GENERAL

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. DISASSEMBLY

2-1. UPPER CASE,

FRONT PANEL BLOCK ASSEMBLY ··························2-1 2-2. FR-130 BOARD, DM-74 BOARD ·································2-1 2-3. REAR PANEL ·································································2-1 2-4. POWER BLOCK, MA-318 BOARD

(WITH S MECHANISM DECK) ··································· 2-2 2-5. S MECHANISM DECK ·················································2-2 2-6. INTERNAL VIEWS························································2-3 2-7. INTERNAL VIEWS························································2-4

3. BLOCK DIAGRAMS

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. PRINTED WIRING BOARDS AND

SCHEMATIC DIAGRAMS

4-1. FRAME SCHEMATIC DIAGRAM································4-1 4-2. PRINTED WIRING BOARDS AND

SCHEMATIC DIAGRAMS ············································4-2

• MA-318 (REC/PB AMP, VIDEO, SERVO/SYSTEM CONTROL, AUDIO, TUNER)

PRINTED WIRING BOARD ·························4-2

• MA-318 (REC/PB AMP) SCHEMATIC DIAGRAM ··4-5

• MA-318 (VIDEO, NORMAL AUDIO)

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

• MA-318 (SERVO/SYSTEM CONTROL) SCHEMATIC DIAGRAM ····························4-11

• MA-318 (ON SCREEN DISPLAY) SCHEMATIC DIAGRAM ····························4-15

• MA-318 (DSF) SCHEMATIC DIAGRAM················4-17

• MA-318 (V-SET) SCHEMATIC DIAGRAM ············4-19

• MA-318 (AFM AUDIO) SCHEMATIC DIAGRAM ····························4-21

• MA-318 (TUNER) SCHEMATIC DIAGRAM··········4-23

• MA-318 (POWER SUPPLY, AV-BUS) SCHEMATIC DIAGRAM ····························4-25

• FR-130 (MODE CONTROL) PRINTED WIRING BOARD ·······················4-27

• FR-130 (MODE CONTROL) SCHEMATIC DIAGRAM ····························4-29

• DM-74 (OPERATION SWITCHES) PRINTED WIRING BOARD AND SCHEMATIC DIAGRAM ····························4-31

• JK-159 (LINE-2 IN) PRINTED WIRING BOARD AND SCHEMATIC DIAGRAM ····························4-33

• POWER BLOCK SR801 (SWITCHING REGULATOR) PRINTED WIRING BOARD AND SCHEMATIC DIAGRAM ····························4-35

• POWER BLOCK SR709 (SWITCHING REGULATOR) PRINTED WIRING BOARD AND SCHEMATIC DIAGRAM ····························4-37

5. INTERFACE, IC PIN FUNCTION DESCRIPTION

5-1. SYSTEM CONTROL —

VIDEO BLOCK INTERFACE (MA-318 BOARD IC161)···············································5-1

5-2. SYSTEM CONTROL —

SERVO PERIPHERAL CIRCUIT INTERFACE (MA-318 BOARD IC161)···············································5-1

5-3. SYSTEM CONTROL —

MECHANISM INTERFACE (MA-318 BOARD IC161)···············································5-2

5-4. SYSTEM CONTROL —

SYSTEM CONTROL PERIPHERAL CIRCUIT INTERFACE (MA-318 BOARD IC161) ·······5-2

5-5. SYSTEM CONTROL —

AUDIO BLOCK INTERFACE (MA-318 BOARD IC161)···············································5-2

5-6. SERVO/SYSTEM CONTROL MICROPROCESSOR

PIN FUNCTIONS (MA-318 BOARD IC161)················ 5-3

5-7. TUNER/TIMER MODE CONTROL PIN FUNCTIONS

(FR-130 BOARD IC460) ················································5-4

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.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-318 Board) ·························6-2 2-3. SER VO SYSTEM CHECK ·············································6-3 2-3-1.RF Switching Position/

AF Switching Position Adjustments (MA-318 Board) ···6-3

2-4. VIDEO SYSTEM CHECKS AND ADJUSTMENT·······6-4 2-4-1.X’tal OSC Check (MA-318 Board)·································6-4

— 4 —

2-4-2.SYNC AGC Check (MA-318 Board)······························6-4 2-4-3.Recording Y Level Check (MA-318 Board) ···················6-4 2-4-4.Recording Chroma Level Check (MA-318 Board) ········· 6-5 2-4-5.Playback Level Check (MA-318 Board) ·························6-5 2-5. AUDIO SYSTEM ADJUSTMENT·································6-5 2-5-1.ACE Head Adjustment ···················································· 6-5 2-5-2.E-E Output Level Check ·················································6-5 2-5-3.Overall Output Level and Distortion Factor Check·········6-6 2-5-4.Overall Noise Level Check··············································6-6 2-6. TUNER SYSTEM ADJUSTMENT································6-6 2-6-1.Separation Adjustment (MA-318 Board) ························6-6 2-7. ADJUSTING PARTS LOCATION DIAGRAM ·············6-8

7. REPAIR PARTS LIST

7-1. EXPLODED VIEWS ······················································7-1 7-1-1.FRONT PANEL ASSEMBLY AND UPPER CASE

SECTION ········································································7-1 7-1-2.CHASSIS SECTION·······················································7-2 7-1-3.MECHANISM DECK-1 ·················································7-3 7-1-4.MECHANISM DECK-2 ·················································7-4 7-1-5.MECHANISM DECK-3 ·················································7-5 7-2. ELECTRICAL PARTS LIST ··········································7-6

— 5 —

SLV-798HF/998HF

SERVICE NOTE

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.”

Mode code indication when the error has occurred.

Error code

ERROR CODE

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

MODE CODE

0 P ower-on eject 10 FWD x1 20 REW play 1 P ower-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 P ower-on stop 18 Power-off initial 28 Cas. loading 9 PB 19 Mecha. error (Power off) (No auto PB check)

— 6 —

2. HOW TO REPLACE A ROTARY

There is no printed circuit board.

DRUM ASSEMBLY

DZH-96A-R (998HF)

(8-839-046-02)

DZH-94A/Z-RP (Except 998HF)

(8-839-044-02)

—T op View—

UPPER DRUM

See below for note.

2-1. HOW TO REMOVE A ROTARY UPPER DRUM

1) Remove screw 1 (+P3 × 8) and remove the ground shaft

assembly 2. (Refer to Fig. 4.)

2) Remove soldering which is marked by arrow and remove the rotary upper drum board completely.

3) Remove two screws 3 (PSW3 × 8) and remove the rotary upper drum in the direction of A. (Refer to Fig. 5.) If removal is difficult, remove it while rotating it slowly.

Note: If removal is difficult, check again if soldering is removed

completely.

Ground shaft assembly

Screw (+P3 × 8)

Soldering

4

Plate

spring

Drum when viewed from the top

2-2. HOW TO ATTACH A NEW ROTARY UPPER

DRUM

1) Pay attention so that finger print or like must not be put when inserting a new upper drum into lower drum.

2) Align mark of the rotary upper drum board with the mark of the rotary transformer board so that the screw hole on the upper drum and that on the lower drum are aligned. (Refer to Fig. 5.)

3) If attaching is difficult, attach a upper drum while rotating it slowly.

Note: Pay attention not to damage the video heads.

Confirm that the upper drum is inserted completely.

4) Tighten the two screws 3 (PSW3 × 8). (Refer to Fig. 5.)

5) Fix the earth shaft 2 by tightening the screw 1 (+P3 × 8) so that protrusion at the tip of the earth shaft contacts the center of the drum shaft.

Note: When attaching the ground shaft assembly 2, never give

force to the plate spring 4.

PSW3 × 8

Upper drum assembly DZR-51-R (8-848-594-02) (998HF) DZR-45-R (8-848-576-02) (EXCEPT 998HF)

Note : There are two types of drum assembly built in models.

[Discrimination]

Fig. 4

UPPER DRUM ASSEMBLY

DZR-51-R (998HF)

(8-848-594-02)

DZR-45-R (Except 998HF)

(8-848-576-02)

—T op View—

Align the two arrow marks.

Lower drum assembly DZL-51B/J-RP (8-848-666-11)

Fig. 5

There are two printed circuit boards on the top.

Note: It cannot be divided to two parts, the upper and

the lower drum assemblies.

— 7 —

SECTION 1

GENERAL

SLV-798HF/998HF

This section is extracted from the SLV-998HF instruction manual.

1-1

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

1-16

1-17

1-18

1-19

1-20E

SECTION 2

)

DISASSEMBLY

NOTE: Follow the disassembly procedure in the numerical order given.

2-1. UPPER CASE, FRONT PANEL BLOCK ASSEMBLY

Screws (case)

Connector From CN423 on MA-318 board

Flat cable From CN162 on MA-318 board

Hooks

Upper case

SLV-798HF/998HF

Screws (case

Front panel

block assembly

Hooks

2-2. FR-130 BOARD, DM-74 BOARD

Flat cable From CN140 on FR-130 board

Screw (B2.6 × 8)

JK ground plate

Front panel assembly

JK insulated plate

FR-130 board

Screw (B2.6 × 8)

JK-159 board

2-3. REAR PANEL

Hooks

Screws (B2.6 × 8)

Hooks

Screws (B2.6 × 8)

DM-74 board

Frexible board From CN441 on DM-74 board

Hooks

2-1

Release cable stopper

from rear panel

Hooks

Rear pane

2-4. POWER BLOCK, MA-318 BOARD (WITH S MECHANISM DECK)

)

Connector (From CN201 on power block

Screws

Power block

Screws

MA-318 board

(with S mechanism deck)

2-5. S MECHANISM DECK

Screws

MD base (R)

Flexible board From CN260 on MA-318 board

MD base (R)

Screws

S mechanism dec

MA-318 board

MD base (M)

2-2

2-6. INTERNAL VIEWS

— Top View —

FE head 1-500-144-11

M901 (Note) Upper drum assembly DZR-45-R 8-848-576-02 (Except 998HF) Upper drum assenbly DZR-51-R 8-848-594-02 (998HF) Lower drum assembly DZL-51B/J-RP 8-848-666-11 Drum Assembly DZH-94A/Z-RP (Except 998HF) 8-839-044-02 Drum Assembly DZH-96A-R (998HF) 8-839-046-02

Note : See page 7 for the note about dru assembly.

ACE head block assembly A-6759-620-A

Pinch press block assembly A-6759-615-A

— Bottom View —

Reel (S) table 3-977-507-01

M902 DC motor (capstan) 1-698-971-11

FL complete assembly A-6759-619-C

Reel (T) table 3-977-508-01

M901 (Note) Lower drum assembl DZL-51B/J-RP 8-848-666-11

Rubber belt 3-977-510-01

M903 Cam motor assembly X-3947-577-1

2-3

+ 105 hidden pages

Sony SLV-798-HF Service manual

TABLE OF CONTENTS

SERVICE NOTE

GENERAL

DISASSEMBLY