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SERVICE MANUAL
(VC-A598U/H995U/H996U/H997U)
(VC-H9977U/H998U)
1. GENERAL INFORMATION .............................. 5
1-1 FEATURES ................................................. 5
1-2 SPECIFICATIONS ..................................... 5
1-3 LOCATION OF MAJOR COMPONENTS
AND CONTROL ......................................... 6
2. DISASSEMBLY AND REASSEMBLY .............. 7
2-1 DISASSEMBLY OF MAJOR BLOCKS ....... 7
2-2 DISASSEMBLING THE MECHANISM/
MAIN PWB ASSEMBLY ............................. 8
2-3 CARES WHEN REASSEMBLING .............. 9
3. FUNCTION OF MAJOR MECHANICAL
PARTS ............................................................ 10
4. ADJUSTMENT, REPLACEMENT AND
ASSEMBLY OF MECHANICAL UNITS .......... 12
4-1 MECHANISM CONFIRMATION
ADJUSTMENT JIG .................................. 12
5. ELECTRICAL ADJUSTMENT ........................ 31
5-1 ADJUSTMENT OF HEAD SWITCHING
POINT ....................................................... 32
SHARP CORPORATION
VIDEO CASSETTE RECORDER
VC-A598U/H995U/
MODELS
In the interests of user-safety (Required by safety regulations in some
countries) the set should be restored to its original condition and only parts
identical to those specified be used.
CONTENTS
Page
5-2 ADJUSTMENT OF FV (False Vertical Sync)
OF STILL PICTURE ................................. 32
5-3 CHECKING OF OFF TRACK ................... 32
5-4 ADJUSTMENT OF SIF-INPUT LEVEL .... 33
5-5 ADJUSTMENT OF STEREO
SEPARATION ...........................................33
INITIAL JUMPER STTING METHOD ............. 33
6. MECHANISM OPERATION FLOWCHART
AND TROUBLESHOOTING GUIDE .............. 34
7. TROUBLESHOOTING ................................... 40
8. BLOCK DIAGRAM ..........................................51
9. SCHEMATIC DIAGRAM AND PWB FOIL
PATTERN ....................................................... 59
10.PARTS LIST .................................................... 75
11.EXPLODED VIEW OF MECHANICAL
PARTS ............................................................ 84
12.PACKING OF THE SET ................................. 89
VC-A598U/H995U/H996U/H998U ..... Models for U.S.A.
VC-H997U/H9977U/H998U ............... Models for CANADA
This document has been published to be used for
after sales service only.
1
The contents are subject to change without notice.
VC-A598U/H995U/H996U
-H997U/H9977U/H998U
H996U/H997U/
H9977U/H998U
S39D6VC-A598U
Page
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Summary of Contents for Sharp VC-A598U
- Page 1 5. ELECTRICAL ADJUSTMENT ......31 12.PACKING OF THE SET ......... 89 5-1 ADJUSTMENT OF HEAD SWITCHING POINT ............32 VC-A598U/H995U/H996U/H998U ..Models for U.S.A. VC-H997U/H9977U/H998U ....Models for CANADA This document has been published to be used for SHARP CORPORATION after sales service only.
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Page 2: Important Service Notes
VC-A598U/H995U/H996U -H997U/H9977U/H998U IMPORTANT SERVICE NOTES etc.) and measure the AC voltage drop across the BEFORE RETURNING THE VIDEO CASSETTE RECORDER resistor. Reverse the AC plug on the set and repeat AC voltage measurements for each exposed part. Any reading of 0.45V rms (this corresponds to 0.3mA Before returning the video cassette recorder to the user, perform the following safety checks. - Page 3 VC-A598U/H995U/H996U -H997U/H9977U/H998U NOTES DE SERVICE IMPORTANTES AVANT DE RENDRE LE MAGNETOSCOPE entre la résistance. Inverser la fiche CA (une fiche intermédiaire non polarisée doit être utilisée à seule fin de faire ces vérifications.) sur l’appareil et répéter les mesures de tension Avant de rendre le magnétoscope à...
- Page 4 VC-A598U/H995U/H996U -H997U/H9977U/H998U PRECAUTIONS IN PART REPLACEMENT When servicing the unit with power on, be careful to the section marked white all over. This is the primary power circuit which is live. When checking the soldering side in the tape travel mode, make sure first that the tape has been loaded and then turn over the PWB with due care to the primary power circuit.
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Page 5: General Information
Allowable ambient temperature: with T-120 tape 5°C to 40°C (41°F to 104°F) Operating humidity: below 80% RH Dimensions: 360 (W), 92 (H), 256 (D) mm(14-3/16, 3-5/8, 10-5/64 inch)(VC-A598U/H995U) 360 (W), 92 (H), 256 (D) mm(14-3/16, 3-5/8, 10-5/64 inch) (Except VC-A598U/H995U) Weight: 2.8 kg (6.17 lbs) -
Page 6: Location Of Major Components And Control
VC-A598U/H995U/H996U -H997U/H9977U/H998U 1-3 LOCATION OF MAJOR COMPONENTS AND CONTROL...