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SLV-777HF/778HF/788HF
SERVICE MANUAL
G
j
• Refer to the SERVICE MANUAL of VHS MECHANICAL
ADJUSTMENT
for MECHANICAL ADJUSTMENTS.
(9-921-647-11)
MICROFILM
Photo : SLV-788HF
SPECIFICATIONS
VIDEO CASSETTE RECORDER
RMT-V231B/V232B
US Model
Canadian Model
SLV-777HF/778HF/788HF
PX Model
SLV-777HF
S MECHANISM

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Summary of Contents for Sony SLV-777HF

  • Page 1 SLV-777HF/778HF/788HF RMT-V231B/V232B SERVICE MANUAL US Model Canadian Model SLV-777HF/778HF/788HF PX Model SLV-777HF Photo : SLV-788HF • Refer to the SERVICE MANUAL of VHS MECHANICAL ADJUSTMENT for MECHANICAL ADJUSTMENTS. S MECHANISM (9-921-647-11) SPECIFICATIONS VIDEO CASSETTE RECORDER MICROFILM...
  • Page 2 MARK ! ON THE SCHEMATIC DIAGRAMS AND IN THE PARTS CRITIQUES POUR LA SÉCURITÉ DE FONCTIONNEMENT. NE LIST ARE CRITICAL TO SAFE OPERATION. REPLACE THESE REMPLACER CES COMPOSANTS QUE PAR DES PIÈSES SONY COMPONENTS WITH SONY PARTS WHOSE PART NUMBERS DONT LES NUMÉROS SONT DONNÉS DANS CE MANUEL OU APPEAR AS SHOWN IN THIS MANUAL OR IN SUPPLEMENTS DANS LES SUPPÉMENTS PUBLIÉS PAR SONY.
  • Page 3 SAFETY CHECK-OUT After correcting the original service problem, perform the following safety checks before releasing the set to the customer. LEAKAGE TEST Check the area of your repair for unsoldered or poorly-soldered connections. Check the entire board surface for solder splashes and bridges.
  • Page 4: Table Of Contents

    TABLE OF CONTENTS SERVICE NOTE • MA-327 (VIDEO, NORMAL AUDIO) SCHEMATIC DIAGRAM ······························ 4-8 ERROR CODE INDICATION ··········································· 6 • MA-327 (SERVO/SYSTEM CONTROL) HOW TO REPLACE A ROTARY UPPER DRUM SCHEMATIC DIAGRAM ···························· 4-11 (777HF, 778HF MODEL) ·················································· 7 • MA-327 (ON SCREEN DISPLAY) 2-1.
  • Page 5 2-4. VIDEO SYSTEM CHECKS ··········································· 6-4 2-4-1. X’tal OSC Check (MA-327 Board) ································· 6-4 2-4-2. SYNC AGC Check (MA-327 Board) ······························ 6-4 2-4-3. Recording Y Level Check (MA-327 Board) ··················· 6-4 2-4-4. Recording Chroma Level Check(MA-327 Board) ·········· 6-5 2-4-5. Playback Level Check (MA-327 Board) ························· 6-5 2-5.
  • Page 6: Service Note

    SLV-777HF/778HF/788HF 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.
  • Page 7: How To Replace A Rotary Upper Drum

    HOW TO REPLACE A ROTARY UPPER DRUM (777HF, 778HFMODEL) See below for note. 2-1. HOW TO REMOVE A ROTARY UPPER DRUM 2-2. HOW TO ATTACH A NEW ROTARY UPPER Remove screw 1 (+P3 × 8) and remove the ground shaft DRUM assembly 2.
  • Page 8: General

    SLV-777HF/778HF/788HF SECTION 1 This section is extracted from the GENERAL SLV-788HF instruction manual.
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  • Page 28: Disassembly

    SLV-777HF/778HF/788HF SECTION 2 DISASSEMBLY NOTE: Follow the disassembly procedure in the numerical order given. 2-1. UPPER CASE, FRONT PANEL BLOCK ASSEMBLY 1 Screws (case) Upper case 3 Connector From CN423 on MA-327 board 4 Hooks 1 Screws (case) 3 Flat cable...
  • Page 29: Power Block, Ma-327 Board

    2-4. POWER BLOCK, MA-327 BOARD (WITH S MECHANISM DECK) Connector (From CN101 on power block) 2 Screws 3 Power block 4 Screws 5 MA-327 board (with S mechanism deck) 2-5. S MECHANISM DECK 1 Flexible board From CN260 on 2 Screws MA-327 board 4 Screws S mechanism deck...
  • Page 30: Internal Views

    2-6. INTERNAL VIEWS — Top View — M901 (Note) Note : See page 7 for the note about drum Upper drum assembly DZR-45-R assembly. 8-848-576-02 (777HF, 778HF) Lower drum assembly DZL-51B/J-RP 8-848-666-11 (777HF, 778HF) Drum Assembly DZH-94A/Z-RP 8-839-044-02 ACE head block assembly A-6759-620-A Pinch press block assembly FE head...
  • Page 31: Circuit Boards Location

    2-7. CIRCUIT BOARDS LOCATION MA-327 REC/PB AMP, VIDEO, AUDIO, SERVO/SYSTEM CONTROL, TUNER JK-162 (LINE-2 IN) FR-138 (MODE CONTROL) POWER BLOCK DM-80 (OPERATION SWITCHES) 2-4E...
  • Page 32: Block Diagrams

    SLV-777HF/778HF/788HF SECTION 3 BLOCK DIAGRAMS 3-1. OVERALL BLOCK DIA GRAM (SEE PAGE 4-29) MA-327 BOARD IC521 (SEE PAGE 4-5, 8, 11, 15, 17, 19, 21) JK-162 VHF/ TU700 Q560 BOARD VIDEO RF VIDEO VIDEO TUNER/MOD/IF CJ801 CJ570 SO 0 IC160...
  • Page 33: Video Block Diagram

    SLV-777HF/778HF/788HF 3-2. VIDEO BLOCK DIA GRAM MA-327 BOARD (SEE PAGE 4-5, 8, 15) CJ570 LINE Q523 Q560 BUFFER BUFFER VIDEO IC201 #∞ REC IC201 #• REC/PB (SEE PAGE 4-28) IC521 !º REC/PB RF VIDEO TU701 5 TUNER 1Vp-p BLOCK JK-162...
  • Page 34: Servo/System Control Block Diagram

    SLV-777HF/778HF/788HF 3-3. SERVO/SYSTEM CONTROL BLOCK DIA GRAM MA-327 BOARD (SEE PAGE 4-8, 11, 22) CN104 RESET M12V IC160 (2/2) S DATA CHECK DRUM MOTOR IC160 &• REC/PB D109 D109 SYSTEM CONTROL S CLK CN101 D161 L161 M901 IC160 (1/2) AMP VCC...
  • Page 35: Audio Block Diagram

    SLV-777HF/778HF/788HF 3-4. AUDIO BLOCK DIA GRAM MA-327 BOARD (SEE PAGE 4-5, 17) FM PB HF ADJ CHECK IC360 CN341 SW5V SW12V IC340 AUDIO PROCESSOR L341 (HIFI) REC/PB SW12V SW12V DRUM CJ570 AUDIO CN260 HEAD LINE MUTE AUDIO OUTPUT Q386 FM PB...
  • Page 36: Mode Control Block Diagram

    SLV-777HF/778HF/788HF 3-5. MODE CONTROL BLOCK DIA GRAM FR-138 BOARD (SEE PAGE 4-25) IC420 FLUORESCENT MODE CONTROL INDICATOR TUBE SEG1 CN402 SEG16 -30V 27 VEE S CLK 0 S OUT 0 D IN S IN 0 D OUT JOG LED FLD CS...
  • Page 37: Tuner Block Diagram

    SLV-777HF/778HF/788HF 3-6. TUNER BLOCK DIA GRAM MA-327 BOARD (SEE PAGE 4-19) SW12V SW5V L731 TU701 TU701 TUNER/MOD/IF TUNER/MOD/IF IF702 V OUT TU VIDEO IC201 32 VIDEO SPLITTER BLOCK IC733 (SEE PAGE 3-3) VHF/ ST/BILINGUAL PROCESSOR TU AUDIO L IC360 AUDIO...
  • Page 38: Power Supply Block Diagram

    SLV-777HF/778HF/788HF 3-7. POWER SUPPLY BLOCK DIA GRAM MA-327 BOARD (SEE PAGE 4-5, 8, 11, 15, 17, 19, 21) IC733 TU701 ST/BILNG PROCESSOR IF702 CN603 L604 L604 R705 +30V IC601 IC201 (1/2) L702 POWER Y/C PROC. SW12V L204 BLOCK Y VCC...
  • Page 39: Printed Wiring Boards And Schematic Diagrams

    SLV-777HF/778HF/788HF SECTION 4 PRINTED WIRING BOARDS AND SCHEMATIC DIAGRAMS 4-1. FRAME SCHEMA TIC DIAGRAM FRAME SCHEMATIC DIAGRAM...
  • Page 40: Schematic Diagrams

    SLV-777HF/778HF/788HF 4-2. PRINTED WIRING BOARDS AND SCHEMATIC DIAGRAMS MA-327 (REC/PB AMP, VIDEO, SERVO/SYSTEM CONTROL, AUDIO, TUNER) PRINTED WIRING BOARD There are few cases that the part printed on this diagram isn’t mounted in this model. — Ref. No.: MA-327 Board; 1,000 Series —...
  • Page 41: Rec/Pb Amp

    SLV-777HF/778HF/788HF MA-327 (REC/PB AMP) SCHEMATIC DIAGRAM — Ref. No.: MA-327 Board; 1,000 Series — MA-327 BOARD THIS NOTE IS COMMON FOR PRINTED WIRING BOARDS AND SCHEMATIC DIAGRAMS. MA-327 BOARD IC260 4 REC (In addition to this, the necessary note is...
  • Page 42: Video, Normal Audio

    SLV-777HF/778HF/788HF MA-327 (VIDEO, NORMAL AUDIO) SCHEMATIC DIAGRAM — Ref. No.: MA-327 Board; 1,000 Series — • See page 4-3 for MA-327 BOARD printed wiring board. MA-327 BOARD !£ IC201 !∞ PB IC201 #• REC/ PB CN261 2 PB 2Vp-p 200mV/Div 0.1µsec/div...
  • Page 43: Servo/System Control

    SLV-777HF/778HF/788HF MA-327 (SERVO/SYSTEM CONTROL) SCHEMATIC DIAGRAM • See page 4-3 for MA-327 BOARD printed wiring board. — Ref. No.: MA-327 Board; 1,000 Series — MA-327 BOARD !¶ @¢ IC160 !• REC/PB IC160 *∞ REC/ PB !• IC160 !ª (HiFi STEREO MODEL) 5Vp-p 4.4Vp-p...
  • Page 44: On Screen Display

    SLV-777HF/778HF/788HF SLV-777HF/778HF/788HF • See page 4-3 for MA-327 BOARD printed wiring board. MA-327 (ON SCREEN DISPLAY) SCHEMATIC DIAGRAM — Ref. No.: MA-327 Board; 1,000 Series — MA-327 BOARD @ª IC521 8, !º REC/PB 2Vp-p ON SCREEN DISPLAY 4-15 4-16 MA-327 (4/8)
  • Page 45: Schematic Diagram

    SLV-777HF/778HF/788HF MA-327 (AFM A UDIO) SCHEMATIC DIAGRAM • See page 4-3 for MA-327 BO ARD printed wiring boar d. — Ref. No.: MA-327 Board; 1,000 Series — AFM AUDIO 4-17 4-18 MA-327 (5/8)
  • Page 46: Schematic Diagram

    SLV-777HF/778HF/788HF MA-327 (TUNER) SCHEMA TIC DIAGRAM • See page 4-3 for MA-327 BO ARD printed wiring boar d. — Ref. No.: MA-327 Board; 1,000 Series — TUNER 4-19 4-20 MA-327 (6/8)
  • Page 47: Schematic Diagram

    SLV-777HF/778HF/788HF MA-316 (POWER SUPPLY, AV-BUS) SCHEMATIC DIAGRAM • See page 4-3 for MA-327 BO ARD printed wiring boar d. — Ref. No.: MA-327 Board; 1,000 Series — POWER SUPPLY, AV-BUS 4-21 4-22 MA-327 (7/8) (8/8)
  • Page 48 SLV-777HF/778HF/788HF FR-138 (MODE CONTROL) PRINTED WIRING BOARD There are few cases that the part printed on this diagram isn’t mounted in this model. — Ref. No.: FR-138 Board; 2,000 Series — FR-138 BOARD MA-327 REC/PB AMP, VIDEO, AUDIO, CN401 SERVO/SYSTEM CONTROL,...
  • Page 49: Schematic Diagram

    SLV-777HF/778HF/788HF FR-138 (MODE CONTROL) SCHEMA TIC DIAGRAM — Ref. No.: FR-138 Board; 2,000 Series — MODE CONTROL 4-25 4-26 FR-138...
  • Page 50: Schematic Diagram

    SLV-777HF/778HF/788HF DM-80 (OPERATION SWITCHES) PRINTED WIRING BOARD AND SCHEMATIC DIAGRAM JK-162 (LINE-2 IN) PRINTED WIRING BOARD AND SCHEMATIC DIAGRAM — Ref. No.: DM-80 Board; 2,000 Series — — Ref. No.: JK-162 Board; 2,000 Series — There are few cases that the part printed on this diagram isn’t mounted in this model.
  • Page 51: Schematic Diagram

    SLV-777HF/778HF/788HF POWER BLOCK SR801 (SWITCHING REGULATOR) PRINTED WIRING BOARD AND SCHEMATIC DIAGRAM There are few cases that the part printed on this diagram isn’t mounted in this model. — Ref. No.: SR801 Board; 8,000 Series — POWER BLOCK (SR801) T101 POWER TRANSFORMER...
  • Page 52: Schematic Diagram

    SLV-777HF/778HF/788HF POWER BLOCK SR709 (SWITCHING REGULATOR) PRINTED WIRING BOARD AND SCHEMATIC DIAGRAM There are few cases that the part printed on this diagram isn’t mounted in this model. — Ref. No.: SR709 Board; 9,000 Series — POWER BLOCK (SR709) T101 POWER TRANSFORMER...
  • Page 53: System Control - Mechanism Block Interface

    SLV-777HF/778HF/788HF SECTION 5 INTERFACE, IC PIN FUNCTION DESCRIPTION 5-1. SYSTEM CONTROL — MECHANISM BLOCK INTERFACE (MA-327 board IC160) CASSETTE CASSETTE TAPE TAPE Signal Pin No. EJECTED STOP LOARDING UNLOARDING THREADING UNTEREADING MA-327 Board IC160 %• MA-327 Board MODE 1 —...
  • Page 54: System Control - System Control Peripheral Circuit Interface

    5-3. SYSTEM CONTROL — SYSTEM CONTROL PERIPHERAL CIRCUIT INTERFACE (MA-327 board IC160) Signal Pin No. I/O level MA-327 Board RESET Normally “H”. “L” when service interruption detected or restored. IC160 $£ MA-327 Board Serial communication data to audio microprocessor and I2C DATA1 IC160 @™...
  • Page 55 5-3E...
  • Page 56: Adjustments

    SLV-777HF/778HF/788HF SECTION 6 ADJUSTMENTS 6-1 MECHANICAL ADJUSTMENTS 2-1-3. Input Signal Check Video signal produced by a pattern generator is used as an adjustment signal to perform electrical alignment for this unit. This video signal For the mechanical adjustments, please refer to the must satisfy the specification.
  • Page 57: Input/Output Levels And Impedance

    2-1-5. Input/Output Levels and Impedance 2-2. POWER SUPPLY CHECK Video input: LINE IN 2-2-1. Output Voltage Check (MA-327 Board) Input signal: 1Vp-p, 75ohms, unbalanced, Mode sync negative Measuring Instrument Digital voltmeter Video output: LINE OUT SW 12V Check Output signal: 1Vp-p, 75ohms, unbalanced, IC601 pin 2 sync negative Measurement point...
  • Page 58: Servo System Check

    2-3. SERVO SYSTEM CHECK Unless otherwise specified, set the switches to the following positions. • INPUT SELECT switch ..........LINE 1 • TAPE SPEED switch ............SP 2-3-1. RF Switching Position/ AF Switching Position Adjustments (MA-327 Board) [Adjustment Purpose] To adjust the link of the A-ch and B-ch of the tape playback outputs. To make the unit compatible with other tapes and units.
  • Page 59: Video System Checks

    2-4. VIDEO SYSTEM CHECKS 2-4-2. SYNC AGC Check (MA-327 Board) For the video system checks, follow the checking procedures given Mode below as a rule. The color bar video signal supplied from the pattern Signal Color bar generator is used as the video input signal for the video system IC201 pin #•...
  • Page 60: Playback Level Check (Ma-327 Board)

    2-4-4. Recording Chroma Level Check 2-5. AUDIO SYSTEM ADJUSTMENT (MA-327 Board) • For the adjustment of the audio system, perform in the SP mode if there is no special notes. Use the alignment tape. Mode Recording (SP) Signal Color bar [Connecting Instruments] IC201 pin !¢...
  • Page 61: Overall Noise Level Check

    2-5-3. Overall Output Level and Distortion Factor Check Mode Self-record playback Signal 400Hz, –7.5dBs : CJ570 Measurement point CJ570 Measuring instrument Audio level meter and Distortion meter Specified value Playback Level: –7.5 ± 3dBs Distortion: 4.0% or less [Check Method] 1) Input signal of 400Hz and –7.5dBs to the audio input.
  • Page 62: Adjusting Parts Location Diagram

    2-7. ADJUSTING P ARTS LOCA TION DIAGRAM MA-327 BOARD (CONDUCTOR SIDE) CJ570 LINE IN/OUT CN261 RF SW POS AF SW POS CN341 AF SW POS IC601 SW12V Q605 RV731 MTR12V SEPARATION JS161 RF SW POS AF SW POS Q603 SW5V 6-8E...
  • Page 63: Repair Parts List

    SLV-777HF/778HF/788HF SECTION 7 REPAIR PARTS LIST 7-1. EXPLODED VIEWS NOTE: • -XX, -X mean standardized parts, so they may • The mechanical parts with no reference number The components identified by mark ! or have some differences from the original one.
  • Page 64: Chassis Section

    7-1-2. CHASSIS SECTION Not supplied Ref. No. Part No. Description Remarks Ref. No. Part No. Description Remarks 3-979-314-01 BASE (R), MD ! 54 1-468-282-11 POWER BLOCK SR709 (PX) * 52 A-6791-459-A MA-327(A) BOARD, COMPLETE (788HF) * 55 3-979-564-11 PANEL, REAR (EXCEPT 788HF) * 52 A-6791-538-A MA-327(B) BOARD, COMPLETE (777HFPX) * 55...
  • Page 65: Mechanism Deck-1

    7-1-3. MECHANISM DECK-1 #701 supplied #701 Ref. No. Part No. Description Remarks Ref. No. Part No. Description Remarks 3-977-509-01 WASHER, THRUST 3-977-447-01 GEAR, ELEVATOR 3-977-507-01 TABLE, REEL (S) (GRAY) 3-977-514-01 OPENER, LID 3-977-508-01 TABLE, REEL (T) (BLACK) 3-977-441-01 GEAR, PINCH PRESSING 1-500-144-11 HEAD, FE 3-977-445-01 GEAR, TG8 ARM DRIVING 3-977-495-01 SHAFT TG2...
  • Page 66: Mechanism Deck-2

    7-1-4. MECHANISM DECK-2 Note: There are two types of drum assembly in the 777HF, #701 778HF models. [Discrimination] No. 768-770 (Note) —Top View— There are two printed circuit boards on the top. No. 776 #701 —Top View— There is no printed circuit board. #702 Note: It cannot be divided to two parts, the upper and the...
  • Page 67: Mechanism Deck-3

    7-1-5. MECHANISM DECK-3 M902 #701 M903 #703 Ref. No. Part No. Description Remarks Ref. No. Part No. Description Remarks 3-977-437-01 RETAINER,CAM MOTOR 3-977-439-01 GEAR, CAM X-3947-584-1 ASSY, REEL DIRECT 3-977-442-01 SLIDER 3-977-443-01 WASHER, STOPPER 3-977-455-01 GEAR, LOADING(T) 3-977-438-01 WORM - WHEEL 3-977-456-03 SPRING, TORSION (LOAD T) 3-977-506-01 ARM, LIMITTER SELECTION X-3947-579-1 LEVER ASSY, LOADING(T)
  • Page 68: Electrical Parts List

    DM-80 FR-138 7-2. ELECTRICAL PARTS LIST NOTE: • Due to standardization, replacements in the • RESISTORS When indicating parts by reference number, parts list may be different from the parts All resistors are in ohms. please include the board name. specified in the diagrams or the components METAL: metal-film resistor The components identified by mark ! or...
  • Page 69 JK-162 MA-327 Ref. No. Part No. Description Remarks Ref. No. Part No. Description Remarks A-6791-462-A JK-162 BOARD, COMPLETE C167 1-163-229-11 CERAMIC CHIP 12PF C168 1-163-227-11 CERAMIC CHIP 10PF 0.5PF ********************** (Ref.No.: 2,000 Series) C169 1-163-235-11 CERAMIC CHIP 22PF C170 1-163-234-11 CERAMIC CHIP 20PF <...
  • Page 70 MA-327 Ref. No. Part No. Description Remarks Ref. No. Part No. Description Remarks C255 1-163-038-00 CERAMIC CHIP 0.1uF C362 1-164-222-11 CERAMIC CHIP 0.22uF C256 1-163-038-00 CERAMIC CHIP 0.1uF C363 1-126-960-11 ELECT C257 1-128-172-11 ELECT 47uF 6.3V C364 1-126-960-11 ELECT C260 1-163-229-11 CERAMIC CHIP 12PF C365...
  • Page 71 MA-327 Ref. No. Part No. Description Remarks Ref. No. Part No. Description Remarks C980 1-163-038-00 CERAMIC CHIP 0.1uF IC162 8-759-248-87 IC MM1256XF-BE C981 1-126-967-11 ELECT 47uF IC201 8-759-488-74 IC LA71534M-MPB C982 1-163-038-00 CERAMIC CHIP 0.1uF IC202 8-759-439-51 IC LC89978M-TE-L C983 1-163-038-00 CERAMIC CHIP 0.1uF IC260...
  • Page 72 MA-327 Ref. No. Part No. Description Remarks Ref. No. Part No. Description Remarks < COIL > < RESISTOR > L161 1-414-936-21 INDUCTOR 22uH R101 1-249-413-11 CARBON 1/4W F L163 1-414-936-21 INDUCTOR 22uH R102 1-216-089-00 METAL CHIP 1/10W L201 1-414-946-21 INDUCTOR 39uH R103 1-216-089-00 METAL CHIP...
  • Page 73 MA-327 Ref. No. Part No. Description Remarks Ref. No. Part No. Description Remarks R227 1-216-025-91 RES,CHIP 1/10W R368 1-216-133-00 METAL CHIP 3.3M 1/10W R228 1-216-057-00 METAL CHIP 2.2K 1/10W R370 1-216-065-91 RES,CHIP 4.7K 1/10W R229 1-216-055-00 METAL CHIP 1.8K 1/10W R371 1-208-820-11 RES,CHIP 0.50% 1/10W...
  • Page 74 MA-327 POWER BLOCK SR801 POWER BLOCK SR709 Ref. No. Part No. Description Remarks Ref. No. Part No. Description Remarks ! R705 1-212-893-00 FUSIBLE 1/4W F C205 1-126-925-11 ELECT 470uF R706 1-216-113-00 METAL CHIP 470K 1/10W C206 1-126-967-11 ELECT 47uF R709 1-216-049-00 METAL CHIP 1/10W C207...
  • Page 75 POWER BLOCK SR709 Ref. No. Part No. Description Remarks Ref. No. Part No. Description Remarks C205 1-126-925-11 ELECT 470uF ACCESSORIES & PACKING MATERIALS C206 1-126-967-11 ELECT 47uF ******************************* C207 1-126-925-11 ELECT 470uF 1-475-553-31 COMMANDER, STANDARD(RMT-V231B) < DIODE > (EXCEPT 788HF) 1-475-554-31 COMMANDER, STANDARD(RMT-V232B) D101 8-719-904-05 DIODE...
  • Page 76 SLV-777HF/778HF/788HF Sony Corporation 98C1637-1 Printed in Japan © 1998.3 9-921-682-11 Home A&V Products Company Published by General Engineering Dept. — 110 — (Osaki East)

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