1. Manuals
  2. Brands
  3. JVC Manuals
  4. VCR
  5. HR-J3008UM
  6. Service manual

JVC HR-J3008UM Service Manual

Hide thumbs
Table of Contents

Advertisement

Quick Links

Download this manual
SERVICE MANUAL
VIDEO CASSETTE RECORDER
HR-J3008UM/J4008UM
Regarding service information other than these sections, refer to the HR-A37U service manual (No.82836).
Also, be sure to note important safety precautions provided in the service manual.
SPECIFICATIONS
GENERAL
Power requirement
: AC 110 V – 220 V
Power consumption
Power on
: 14 W
Power off
: 2.0 W
Temperature
Operating
: 5°C to 40°C
Storage
: –20°C to 60°C
Operating position
: Horizontal only
Dimensions (W x H x D) : 360 mm x 94 mm x 247 mm
Weight
: 3.0 kg
Format
: VHS NTSC standard
Maximum recording time
SP
: 210 min. with ST-210 video cassette
EP
: 630 min. with ST-210 video cassette
VIDEO/AUDIO
Signal system
: NTSC-type color signal and EIA
Recording/Playback
: DA-4 (Double Azimuth) head helical
system
Signal-to-noise ratio
: 45 dB
Horizontal resolution
: 230 lines
Frequency range
: 70 Hz to 10,000 Hz
Input/Output
: RCA connectors (IN x 1, OUT x 1)
(The specifications shown pertain specifically to the model HR-J4008UM)
, 50 Hz/60 Hz
d
monochrome signal, 525 lines/
60 fields
scan system
TUNER
Tuning system
: Frequency-synthesized tuner
Channel coverage
VHF
: Channels 2–13
UHF
: Channels 14–69
CATV
: 113 Channels
RF output
: Channel 3 or 4 (switchable; preset to
Channel 3 when shipped) 75 ohms,
unbalanced
TIMER
Clock reference
: Quartz
Program capacity
: 1-year programmable timer/
8 programs
Memory backup time
: Approx. 6 months
Estimated figure based on supplied
fresh battery; actual performance may
differ.
ACCESSORIES
Provided accessories
: RF cable (F-type),
Lithium battery CR2025,
Infrared remote control unit,
"AA" battery x 2,
Conversion plug
Specifications shown are for SP mode unless specified otherwise.
E. & O.E. Design and specifications subject to change without
notice.
No.82852
April 2001

Advertisement

Table of Contents
loading

Related Manuals for JVC HR-J3008UM

Summary of Contents for JVC HR-J3008UM

  • Page 1 SERVICE MANUAL VIDEO CASSETTE RECORDER HR-J3008UM/J4008UM Regarding service information other than these sections, refer to the HR-A37U service manual (No.82836). Also, be sure to note important safety precautions provided in the service manual. SPECIFICATIONS (The specifications shown pertain specifically to the model HR-J4008UM)

  • Page 2: Table Of Contents

    2.2.19 Sub brake assembly (take-up side) ........2-13 LT BATTERY BOARD ASSEMBLY <93> 2.2.20 Main brake assembly (take-up side), [HR-J4008UM] ............... 510 The following table indicate main different points between models HR-A37U,HR-J3008UM and HR-J4008UM. MODEL HR-A37U HR-J3008UM HR-J4008UM ITEM POWER VOLTAGE...
  • Page 3 FINAL ASSEMBLY<M2> MODEL HR-A37U HR-J3008UM HR-J4008UM ITEM FRONT PANELASSEMBLY * LP10348-004D LP10348-009F LP10348-008F 501A CASSETTE DOOR * LP20977-002C LP20977-008C 501C DISPLAY WINDOW LP20976-004A LP20976-009A LP20976-008A TOP COVER LP10352-002A LP10352-008A SCREW,X2,TOP COVER(SIDE) QYTDSF3010M QYTDSF3010R BOTTOM CHASSIS * LP10350-003D LP10350-004D LP10350-005D POWER CORD QMP73J0-170 –––...

  • Page 4: Mechanism Adjustment

    SECTION 2 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 Loading motor soldering iron. (2) Take care not to cause any damage to the conductor wires when plugging and unplugging the connectors. (3) Do not randomly handle the parts without identifying where the trouble is.

  • Page 5: 4Jigs And Tools Required For Adjustment

    2. In case of mechanical failure 2.1.4 Jigs and tools required for adjustment If you cannot remove the cassette tape which is loaded be- Roller driver A/C head positioning tool Torque gauge cause of any mechanical failure, manually remove it by tak- PTU94002 PTU94010 PUJ48075-2...

  • Page 6: 5Maintenance And Inspection

    2.1.5 Maintenance and inspection 1. Location of major mechanical parts In this chapter, the two mechanism speeds are described by comparing the speeds of the standard type and the high-speed FF/REW type. It is possible to distinguish between these two types of mechanism by the diameters of their capstan pulleys. The capstan pulley diameter for the standard type is approx.
  • Page 7 4. Suggested servicing schedule for main components The following table indicates the suggested period for such Guide rail Roller cam assembly service measures as cleaning,lubrication and replacement. In practice, the indicated periods will vary widely according to environmental and usage conditions.However, the indi- cated components should be inspected when a set is brought for service and the maintenance work performed if neces- sary.
  • Page 8 Symbols and numbers R4 R1 T9 T12 T11 B15 B12 B14 B13 B17 B21 B7 B8 B5 B4 B11 T14 T15 T13 T22 T24 T18 B19 Removal parts (Reference items) Replacement parts 2.2.3 Guide rail 2.2.3 Roller cam assembly 2.2.3 Cassette housing bracket 2.2.3 Opener guide 2.2.3 Door opener 2.2.3 Relay gear...

  • Page 9: Replacement Of Major Parts

    2.2 Replacement of major parts 2.2.3 Cassette holder assembly 1. How to remove 2.2.1 Before starting disassembling (Phase matching (1) Remove the guide rail and roller cam assembly. (See between mechanical parts) Fig.2-2-3a.) The mechanism of this unit is closely linked with the rotary (3 lugs on the guide rail and one lug on the roller cam encoder and system controller circuits.
  • Page 10 (5) While holding the left side of the cassette holder, lift the 2. How to install (Phase matching) cassette holder assembly so that the three legs on the (1) Insert the section (A) of the drive arm into the section (B) left side are all released.

  • Page 11: 4Pinch Roller Arm Assembly

    2.2.6 A/C head Notches Guide hole Notch 1. How to remove Relay gear (1) Remove the two screws (A) and remove the A/C head together with the head base. (2) When replacing only the A/C head, remove the three screws (B) while controlling the compression spring. Head base Screws(A) Drive gear...

  • Page 12: 8Capstan Motor

    2. How to install (Centering the mounting position) Loading motor board assembly When the capstan motor has once been removed and then reinstalled out of the initial correct position in the rotational Loading motor direction, the capstan motor current may be unstable during Lugs operation in high or low temperatures.

  • Page 13: Rotary Encoder

    2.2.10 Rotary encoder 2.2.12 Change lever assembly, direct gear, clutch gear and coupling gear 1. How to remove (1) Remove the screw (A) and remove the rotary encoder 1. How to remove by pulling it up. (See Fig. 2-2-10a.) (1) Release the two lugs of the rotary encoder guide in the arrow-indicated direction and remove the change lever assembly.

  • Page 14: Link Lever

    2.2.13 Link lever 2.2.14 Cassette gear, control cam and worm gear 1. How to remove 1. How to remove (1) Remove the two slit washers. (1) Remove the control cam by lifting it. (2) Remove the link lever by lifting it from the shaft retained (2) Open the two lugs of the cassette gear outward and pull by the slit washers.

  • Page 15: Loading Arm Gear (Supply Or Take-Up Side) And Loading Arm Gear Shaft

    (3) Install the control plate so that the section A of the load- (3) Turn the loading arm gear (take-up side) clockwise so ing arm gear shaft fits into the hole (A) of the control plate, that the notch of the loading arm gear (take-up side) is the section B of the control plate guide into the hole (B), in alignment with the projection of the loading arm gear and the control plate comes under the section C of the...

  • Page 16: Take-Up Lever,Take-Up Head And Control Plate Guide

    2.2.17 Take-up lever, take-up head and control plate guide (1) Remove the spring of the take-up lever from the main deck. Spring (2) Remove the lug (A) of the take-up lever from the main Sub brake assembly deck and pull out the take-up lever and the take-up head Lug(A) (take-up side) together.

  • Page 17: Tension Brake Assembly, Reel Disk (Supply Side) And Tension Arm Assembly

    2.2.21 Tension brake assembly, reel disk (supply side) 2.2.23 Stator assembly and tension arm assembly (1) Remove the flat cable. 1. How to remove (2) Remove the two screws (A), (B) and remove the lug wire. (1) Remove the three lugs of the tension brake assembly (3) Remove the stator assembly by lifting in the arrow-indi- from the main deck and pull them off.

  • Page 18: Upper Drum Assembly

    2.2.25 Upper drum assembly Notes: • To replace the upper drum assembly only may not be possible with some models. For upper drum assem- bly replacement, refer to the parts list. (When the parts number of the upper drum assembly is not listed on Lower drum assembly the parts list, then this cannot be replaced.) •...

  • Page 19: 1Fm Waveform Linearity

    2.3 Compatibility adjustment pole base assembly (supply or take-up side). (7) Unload the cassette tape once, play back the alignment Notes: tape (A1) again and confirm the V.PB FM waveform. • Although compatibility adjustment is very important, (8) After adjustment, confirm that the tape wrinkling does not it is not necessary to perform this as part of the nor- occur at the roller upper or lower limits.

  • Page 20: 2Height And Tilt Of The A/C Head

    (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. The screw (1) and (3) are for adjustment of tilt and the screw (2) for azi- muth.
  • Page 21 [Perform adjustment steps (7) to (10) only for 2 Head (4) Set the VCR to the Auto adjust mode by transmitting the models equipped with LP mode.] code (F) twice from the Jig RCU. When the VCR enters the stop mode, the adjustment is completed. (7) Then play back the alignment tape (A2).
  • Page 22 Mechanism Timing Chart EJECT CASS- Mechanism mode CASS-INS FF/REW STOP SLOW/STILL PLAY Control plate mark HIGH C CH HIGH Rotary encoder B CH HIGH A CH Control cam angle 264. 318. 412. Rotary encoder 114. 150. 167. 178. 207. 218. 240.
  • Page 24 VICTOR COMPANY OF JAPAN, LIMITED S40894 VIDEO DIVISION Printed in Japan...

This manual is also suitable for:

Hr-j4008um

Table of Contents