Sony SLV-798HF User manual
SLV-798HF/998HF
RMT-V229/V232C
US Model
SLV-798HF/998HF
Canadian Model
SLV-798HF/998HF
Chilean Model
Mexican Model
PX Model
SLV-998HF
SERVICE MANUAL
VIDEO CASSETTE RECORDER
MICROFILM
S MECHANISM
• Refer to the SERVICE MANUAL of VHS MECHANICAL
ADJUSTMENT for MECHANICAL ADJUSTMENTS.
(9-921-647-11)
G
jPhoto : SLV-998HF
SPECIFICATIONS
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TEL 13942296513 QQ 376315150 892498299
TEL 13942296513 QQ 376315150 892498299
http://www.xiaoyu163.com
http://www.xiaoyu163.com
— 2 —
SAFETY-RELATED COMPONENTWARNING!!
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.
DIFFERENT SPECIFICATIONS
MODEL
SPECIFICATIONS
FLYING ERASE HEAD
BODY COLOR
REMOTE COMMANDER
SLV-998HF
BUILT-IN
BLACK
RMT-V229
SLV-798HF
—
BLACK
RMT-V232C
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TEL 13942296513 QQ 376315150 892498299
TEL 13942296513 QQ 376315150 892498299
http://www.xiaoyu163.com
http://www.xiaoyu163.com
— 3 —
SAFETY CHECK-OUT
After correcting the original service problem, perform the following
safety checks before releasing the set to the customer.
1. Check theareaof yourrepair forunsoldered or poorly-soldered
connections.Check the entire boardsurface forsolder 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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TEL 13942296513 QQ 376315150 892498299
TEL 13942296513 QQ 376315150 892498299
http://www.xiaoyu163.com
http://www.xiaoyu163.com
— 4 —
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 usingVCR 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. PRINTEDWIRING 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.OutputVoltage Check (MA-318 Board) ·························6-2
2-3. SERVO SYSTEM CHECK ·············································6-3
2-3-1.RF Switching Position/
AF Switching Position Adjustments (MA-318 Board) ···6-3
2-4. VIDEO SYSTEM CHECKS ANDADJUSTMENT·······6-4
2-4-1.X’tal OSC Check (MA-318 Board)·································6-4
TABLE OF CONTENTS
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TEL 13942296513 QQ 376315150 892498299
TEL 13942296513 QQ 376315150 892498299
http://www.xiaoyu163.com
http://www.xiaoyu163.com
— 5 —
2-4-2.SYNCAGC Check (MA-318 Board)······························6-4
2-4-3.RecordingY 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
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TEL 13942296513 QQ 376315150 892498299
TEL 13942296513 QQ 376315150 892498299
http://www.xiaoyu163.com
http://www.xiaoyu163.com
— 6 —
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
Mode code indication when the error has occurred.
Error code
SLV-798HF/998HF SERVICE NOTE
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TEL 13942296513 QQ 376315150 892498299
http://www.xiaoyu163.com
http://www.xiaoyu163.com
— 7 —
2. HOW TO REPLACE A ROTARY
UPPER DRUM
See below for note.
2-1. HOWTO 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.
Fig. 4
2-2. HOWTO 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 2by 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.
Fig. 5
1
Screw (+P3
×
8)
2
Ground shaft assembly
Drum when viewed
from the top
Soldering
4
Plate
spring
Soldering
3
PSW3
×
8
Upper drum assembly
DZR-51-R (8-848-594-02)
(998HF)
DZR-45-R (8-848-576-02)
(EXCEPT 998HF)
Align the two arrow marks.
A
Lower drum assembly
DZL-51B/J-RP (8-848-666-11)
Note :There are two types of drum assembly built in models.
[Discrimination]
There are two printed circuit boards
on the top.
UPPER DRUM ASSEMBLY
DZR-51-R (998HF)
(8-848-594-02)
DZR-45-R (Except 998HF)
(8-848-576-02)
—Top View—
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)
—Top View—
Note: It cannot be divided to two parts, the upper and
the lower drum assemblies.
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TEL 13942296513 QQ 376315150 892498299
TEL 13942296513 QQ 376315150 892498299
http://www.xiaoyu163.com
http://www.xiaoyu163.com
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