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JVC KV-V8 Service Manual

Mobile video cassette player
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SERVICE MANUAL
MOBILE VIDEO CASSETTE PLAYER
Contents
q Specifications
q CAUTION
q Instructions
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KV-V8
Comparison table
Item
Signal system
Area Continental
1-1
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1-1
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1-1
1-4
1-4
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1-5
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2-1
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2-4
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2-9
2-11
2-12
COPYRIGHT
2001 VICTOR COMPANY OF JAPAN, LTD.
KV-V8E
KV-V8J
PAL
NTSC
Europe
U.S.A.
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5. PARTS LIST
5.1 PACKING AND ACCESSORY ASSEMBLY <M1>
5.2 FINAL ASSEMBLY <M2>
5.3 MECHANISM ASSEMBLY <M4>
5.4 ELECTRICAL PARTS LIST
KV-V8
Area Suffix
E
Continental Europe
J
North America
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No.49625
Feb. 2001
3-1
3-1
5-1
5-2
5-4
5-6

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Summary of Contents for JVC KV-V8

  • Page 1: Table Of Contents

    ........COPYRIGHT KV-V8 Comparison table Item...
  • Page 2 Specificatios (KV-V8J) General •Power supply •Dimensions •Mass •Allowable working temperature •Allowable relative humidity •Allowable conservation temperature Video •Playback system •Video signal Audio •Playback system •Audio track •Remote control unit Specificatios (KV-V8E) General •Power supply •Dimensions •Mass •Allowable working temperature •Allowable relative humidity •Allowable conservation temperature Video •Playback system...

  • Page 3: Disassembly

    1.1 Disassembly flow chart This flowchart lists the disassembling steps for the cabinet parts and P.C. boards in order to gain access to item(s) to be serviced. When reassembling, perform the step(s) in reverse order. Bend, route and dress the flat cables as they were originally laid.
  • Page 4 (S1c) [1] Top cover (S1a) (S1a) Fig. D1 (S2a) [2] SW board assembly WR2a WR2b Foil side <Note 2a> (L2a) CN3006 (L2a) [2] Front panel assembly SW board (L2b) Chassis Main board Fig. D2 (S1b) (L3a) (S1c) [3] Cassette housing assembly REC safety switch <Note 3a>...
  • Page 5 Note: When installing the Drum assembly, secure the screws (S4a – S4c) in the order of a , b , c . Not used Inertia plate WR4a (L5b) Supporting tape side (S4a) <Note 2a> WR4b (S4c) Supporting tape side <Note 2a> (S4b) Drum assembly...

  • Page 6: Service Position

    1.4 Service position This unit has been designed so that the Mechanism and Main board assemblies can be removed together from the chas- sis assembly. Before diagnosing or servicing the circuit boards, take out the major parts from the chassis assembly. 1.4.1 How to set the "Service position”...

  • Page 7: Emergency Display Function

    This unit has a function for storing the history of the past two emergencies (EMG) and displaying them on each FDP (or OSD). With the status of the VCR and mechanism at the moment an emergency occurred can also be confirmed.
  • Page 8 1.6.3 EMG content description Note: EMG contents “E08/E09” are for the model with Dynamic Drum (DD). CONTENT E01: Loading EMG When the mechanism mode cannot be changed to an- other mode even when the loading motor has rotated for more than 4 seconds in the loading direction, [E:01] is identified and the power is turned off.
  • Page 9 1.6.4 EMG detail information <1> The status (electrical operation mode) of the VCR and the sta- tus (mechanism operation mode/sensor information) of the mechanism in the latest EMG can be confirmed based on the figure in EMG detail information <1> .
  • Page 10 3– : Mechanism sensor information [Common table of MN*, HD* and M3*] Mechanism sensor information Display MN* / HD* REC safety S-VHS SW CASS SW Cassette insertion Tab broken Cassette insertion Tab broken Cassette insertion Tab broken Cassette insertion Tab broken Cassette insertion Tab present Cassette insertion...

  • Page 11: Mechanism Adjustment

    2.1 Before starting repair and adjustment 2.1.1 Precautions (1) Unplug the power cord plug of the VCR before using your soldering iron. (2) Take care not to cause any damage to the conductor wires when plugging and unplugging the connectors.
  • Page 12 2.1.5 Maintenance and inspection 1. Location of major mechanical parts Stator Assembly Guide Rail FE Head Tension Arm Assembly Pole Base Assembly (SUP) Control Plate Tension Band Assembly Slide Plate Rotary Encoder A/C Head Drum Assembly Capstan Motor Reel Disk Assembly Reel Disk Assembly (TU) (SUP) Pole Base Assembly (TU)
  • Page 13 2. Cleaning Regular cleaning of the transport system parts is desirable but practically impossible. So make it a rule to carry out clean- ing of the tape transport system whenever the machine is serviced. When the video head, tape guide and/or brush get soiled, the playback picture may appear inferior or at worst disap- pear, resulting in possible tape damage.

  • Page 14: Replacement Of Major Parts

    Replacement of major parts 2.2.1 Before starting disassembling This mechanism has an exclusive operation mode provided for disassembling and installation of the mechanism (Mecha- nism assembling mode), and it is suggested to set the mechanism to this mode before disassembly and installation.The “Mechanism assembling mode”...
  • Page 15 2.2.6 Loading motor (1) Remove the belt from the worm gear assembly. (2) Take out the 2 screws (A) and then remove the loading motor. Note: • When installing the loading motor, hold it so that the label faces upward. Also take care with the wire colors. Red line Label (Top view) (to pin 1 of connector...
  • Page 16 Reel disk assembly (take up) Fig.2-2-9b 2.2.10 Control plate (1) Take out the slit washer, disengage the 2 hooks while lifting the control cam side of the control plate, and re- move the control plate. Notes: • After removing the control plate, be careful not to turn the main deck assembly upside down.
  • Page 17 2.2.13 Change lever assembly, rotary encoder (1) Slide the change lever assembly in the direction of the arrow and remove. (2) While pushing the claws on both sides in the disengag- ing directions, take out the rotary encoder. (3) When attaching the rotary encoder, position it so that the alignment markings face each other as shown in Fig.
  • Page 18 2.2.16 Guide rail (1) Take out the 5 screws (A) and 1 screw (B). (2) By expanding the rails on the outer sides of the guide rail, remove the 2 pole base assemblies (supply, take up). (3) Disengage the 4 claws and remove the guide rail. Note: •...

  • Page 19: Installation Of Major Parts (Mechanism Phase Alignment)

    Collar 1.5 mm assembly Spring hexagonal wrench Loosen Brush Upper drum assembly Washer Shaft Lower drum assembly Fig. 2-2-19a 2. How to install (1) Clean the coil parts of the lower drum assembly and the newly installed upper drum assembly with an air brush in advance.
  • Page 20 2.3.2 Loading arm assemblies (supply, take up) (1) Attach the loading arm assembly (supply) and loading arm assembly (take up) so that the alignment markings on their gears face each other and the holes on their arms are respectively aligned with the holes on the main deck. (2) Attach the guide rail, attach the pole base assemblies onto the extremities of the arms, then perform the unloading operation so that the pole base assemblies come to the...

  • Page 21: Mechanism Timing Chart

    2.3.5 Control plate (1) Attach the control plate by aligning the 2 alignment holes on the control plate with the alignment holes on the main deck assembly as well as the alignment holes on the take up lever. As the take up lever is pulled by a tension spring, use a pair of tweezers or similar too to align the holes.

  • Page 22: Compatibility Adjustment

    (2) Apply the external trigger signal to D.FF (E), to observe the V.PB FM waveform at the measuring point (D). (3) Set the VCR to the manual tracking mode. (4) Make sure that there is no significant level drop of the V.PB FM waveform caused by the tracking operation, with...
  • Page 23 AUDIO OUT waveform and Control pulse waveform at the measuring points (D1) and (D2) in the ALT mode. (3) Set the VCR to the manual tracking mode. (4) Adjust the AUDIO OUT waveform and Control pulse waveform by turning the screws (1), (2) and (3) little by little until both waveforms reach maximum.
  • Page 24 1) Set the VCR to the mechanism service mode. (See 1.5 Mechanism service mode.) 2) Set the VCR to the play back mode and turn the ad- just pin using the flat-blade screwdriver, etc. by pay- Alignment tape ing attention not to come into contact with the 2.5 mm...

  • Page 25: Electrical Adjustment

    (F) from the Jig RCU. When the VCR enters the stop mode, the adjustment is completed. (6) If the VCR enters the eject mode, repeat steps (1) to (5) again. (7) Play back the alignment tape (A2) again, confirm that the switching point is the specified value (G).
  • Page 26 (1) Play back the signal (A1) of the alignment tape (A2). (2) Set the VCR to the manual tracking mode. (3) Set the VCR to the FWD slow (+1/6x) mode. (4) Transmit the code (F) from the Jig RCU to adjust so that the noise bar becomes the specified value (G) on the TV monitor in the slow mode.
  • Page 27 KV-V8 VICTOR COMPANY OF JAPAN, LIMITED MOBILE ELECTRONICS DIVISION PERSONAL & MOBILE NETWORK BUSINESS UNIT. 10-1,1Chome,Ohwatari-machi,Maebashi-city,Japan No.49625 Printed in Japan 200102(S)

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Kv-v8eKv-v8j

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