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JVC HM-HDS1U Service Manual
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JVC HM-HDS1U Service Manual

Hdd / vhs dual recorder
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JVC SERVICE & ENGINEERING COMPANY OF AMERICA
DIVISION OF JVC AMERICAS CORP.
Head office
:
1700 Valley Road Wayne, New Jersey 07470-9976
East Coast
:
10 New Maple Avenue Pine Brook, New Jersey 07058-9641
:
705 Enterprise Street Aurora, Illinois 60504-8149
Midwest
:
5665 Corporate Avenue Cypress, California 90630-0024
West Coast
:
1500 Lakes Parkway Lawrenceville, Georgia 30043-5857
Atlanta
:
2969 Mapunapuna Place Honolulu, Hawaii 96819-2040
Hawaii
JVC CANADA INC.
Head office
:
21 Finchdene Square Scarborough, Ontario M1X 1A7
Montreal
:
16800 Rte Trans-Canadienne, Kirkland, Quebec H9H 5G7
:
13040 Worster Court Richmond, B.C. V6V 2B3
Vancouver
(973)315-5000
(973)396-1000
(630)851-7855
(714)229-8011
(770)339-2582
(808)833-5828
(416)293-1311
(514)871-1311
(604)270-1311
S40895-03
Printed in Japan
SERVICE MANUAL
HDD / VHS DUAL RECORDER
HM-HDS1U
1
2
1
2
3
4
5
6
3
7
8
9
4
0
<
>
1
2
POWER
HM-HDS1
REC LINK
HDD
–
+
MENU
NAVI
OK
CH
SPECIFICATIONS
GENERAL
Power requirement
: AC 120 V`, 60 Hz
Power consumption
Power on
: 45 W
Power off
: 14 W
Temperature
Operating
: 5°C to 40°C (41°F to 104°F)
Storage
: –20°C to 60°C (–4°F to 140°F)
Operating position
: Horizontal only
Dimensions (WxHxD) : 435 mm x 124 mm x 385 mm
(17-1/16" x 4-15/16" x 15-3/16")
Weight
: 7.4 kg (16.4 lbs)
Input/Output
: RCA connectors: (IN x 1, OUT x 2)
S-Video connectors:(IN x 1, OUT x 2)
HDD DECK VIDEO/AUDIO
Video format
: MPEG2 (VBR)
Audio format
: MPEG1 Layer2
Maximum recording time
(SP)
: 14 hours
(LP)
: 20 hours
(EP)
: 28 hours
(SEP)
: 40 hours
VHS DECK VIDEO/AUDIO
Signal system
: NTSC-type colour signal and EIA monochrome
signal, 525 lines/60 fields
Recording system
: DA4 (Double Azimuth) head helical scan system
Format
: S-VHS/VHS NTSC standard
Signal-to-noise ratio
: 45 dB
Horizontal resolution
: 240 lines (VHS)
400 lines (S-VHS)
Frequency range
: 70 Hz to 10,000 Hz (Normal audio)
20 Hz to 20,000 Hz(Hi-Fi audio)
Maximum recording time
(SP)
: 210 min. with ST-210 video cassette
(EP)
: 630 min. with ST-210 video cassette
This service manual is printed on 100% recycled paper.
COPYRIGHT © 2001 VICTOR COMPANY OF JAPAN, LTD.
EJECT
DIGITPURE TECHNOLOGY
STOP
PLAY
PAUSE
REC
S-VHS ET
S-VHS
VIDEO
(M) L – AUDIO – R
REW
FEW
S-VIDEO
A. DUB
PAUSE
F - 1
TUNER
Tuning system
: Frequency-synthesized tuner
Channel coverage
VHF
: Channels 2–13
UHF
: Channels 14–69
CATV
: 113 Channels
TIMER
Clock reference
: Quartz
Program capacity
: 1-year programmable timer/
16 programs each on the VHS and
HDD deck
Memory backup time
: Approx. 60 min.
ACCESSORIES
Provided accessories
: RF cable (F-type),
Infrared remote control unit, "AA"
battery x 2,
Audio/Video Cable,
S-Video cable (4-pin),
Controller
Specifications shown are for SP mode unless otherwise specified.
E. & O.E. Design and specifications subject to change without notice.
No. 82853
April 2001

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Summary of Contents for JVC HM-HDS1U

  • Page 1 : AC 120 V`, 60 Hz Tuning system : Frequency-synthesized tuner Power consumption Channel coverage Power on : 45 W : Channels 2–13 JVC SERVICE & ENGINEERING COMPANY OF AMERICA Power off : 14 W : Channels 14–69 Temperature CATV : 113 Channels Operating : 5°C to 40°C (41°F to 104°F)
  • Page 2 Hard Disk Drive (HDD) 1. Hard Disk Drive (HDD) Handling Precautions The HDD is a precision device for use in reading and writing a large amount of data on or from a disk rotating at a high speed. If it is not handled carefully, either abnormal operation may result or it may not be possible to read data.
  • Page 3 2. In Case of an HDD Failure When a HDD/VHS DUAL RECORDER AC cord is plugged into a power outlet, the boot loader is read from the IC8204 (8M FLASH ROM), which activates the HDD and reads the system files in the HDD before getting ready for operation.

  • Page 4: Table Of Contents

    TABLE OF CONTENTS Section Title Page Section Title Page Hard Disk Drive (HDD) 3.3 VIDEO CIRCUIT ................... 3-2 3.3.1 D/A level ..................3-2 Important Safety Precautions 3.3.2 EE Y level ..................3-3 INSTRUCTIONS 3.3.3 PB Y level (S-VHS / VHS) .............. 3-3 3.3.4 REC color (colour) level ..............

  • Page 5: Important Safety Precautions

    Important Safety Precautions Prior to shipment from the factory, JVC products are strictly inspected to conform with the recognized product safety and electrical codes of the countries in which they are to be sold. However, in order to maintain such compliance, it is equally important to implement the following precautions when a set is being serviced.
  • Page 6 • Safety Check after Servicing Examine the area surrounding the repaired location for damage or deterioration. Observe that screws, parts and wires have been returned to original positions, Afterwards, perform the following tests and confirm the specified values in order to verify compliance with safety standards.

  • Page 7: Disassembly

    SECTION 1 DISASSEMBLY 1.1 HOW TO REMOVE THE MAJOR PARTS 1.3 DISCONNECTION OF CONNECTORS (WIRES) 1.1.1 Introduction This set is a double-deck video recorder integrating a HDD (Hard Disk Drive) and a VHS deck. Its internal structure is di- vided into three sections that include the power supply, VHS CONNECTOR and HDD sections.

  • Page 8: How To Remove The Major Parts

    1.5 HOW TO REMOVE THE MAJOR PARTS <COM section> 1.5.1 Disassembly flow chart This flowchart shows the disassembly procedure for the ex- terior parts and electrical parts. Top cover ( S2 ) Basically, reverse this procedure when assembling them. ( S2 ) ( S1 ) Top cover, Bracket ( S1 )
  • Page 9 CN5325 CN5321 CN5322 Eject SW Foil side CN5326 board assembly <Note 1> Foil side CN5323 Jack <Note 1> board assembly LED/SW board assembly ( S4 ) LED board assembly ( S4 ) Display board assembly ( S4 ) ( S4 ) ( S4 ) ( S4 ) ( S4 )

  • Page 10: How To Remove The Major Parts

    1.6 HOW TO REMOVE THE MAJOR PARTS <VHS section> Procedures for Lowering the Cassette holder assembly As the mechanism of this unit is integrated with the Housing 1.6.1 Disassembly flow chart assembly, the holder must be lowered and the two screws un- This flowchart shows the disassembly procedure for the ex- screwed when removing the Mechanism assembly.
  • Page 11 Note: When installing the Mechanism assembly, secure (S3) the screws (S8) in the order of a , b . Foil side Foil side <Note 2> <Note 2> (S9) WR11 (S3) (S5) (S3) Foil side CN3014 <Note 4> <Note 2> (S3) <Note 4>...

  • Page 12: How To Remove The Major Parts

    Hard Disk Drive (HDD) Handling Precautions (S5) The HDD is a precision device for use in reading and writing (S5) a large amount of data on or from a disk rotating at a high (S5) speed. If it is not handled carefully, either abnormal opera- (S5) tion may result or it may not be possible to read data.

  • Page 13: Service Positions

    1.8 SERVICE POSITIONS < Installation > The servicing locations for use in troubleshooting or servic- (1) Stand up the bottom chassis assembly so that the Regu- ing of the set are provided separately for the VHS and HDD. lator side is in the lower position. (2) Connect the PATCH CORD to the three FPCs then con- SERVICE POSITIONS <VHS SIDE>...

  • Page 14: Service Position

    1.8.2 Service position <HDD side> (1) Remove the exterior parts (Top cover and front panel as- sembly). (2) Remove the hard disk drive(HDD) together with the frame. PATCH CORD PTU94017B (3) Remove the digital board assembly together with the wires CN8001 attached to it, and place the assembly upside down on CN8901...

  • Page 15: Mechanism Service Mode

    1.9 MECHANISM SERVICE MODE This model has a unique function to enter the mechanism (5) With lock levers A B on the left and right of the Cassette into every operation mode without loading of any cassette holder assembly pulled toward the front, slide the holder tape.
  • Page 16 1.10 CONNECTION TOP VIEW Treat wire so as not to come to the FAN motor. CN512 FAN motor CN703 Supporting tape side CN5325 CN7506 CN5322 Foil side Foil side Make a crease. CN2601 CN7508 Make a crease. Foil side Treat the wire according to the Supporting Foil side...

  • Page 17: Connection

    Type Connection Fig. Pin No. (FPC/ Symbol ←→ Connected point Connected point WIRE) ←→ MAIN CN7507 JACK CN7002 ←→ MAIN CN3011 DISPLAY CN7001 ←→ REGULATOR CN5301 SW REG CN5201 ←→ REGULATOR CN5322 MAIN CN7508 ←→ REGULATOR CN5321 MAIN CN7509 ←→ REGULATOR CN5325 FAN MOTOR...

  • Page 18: Emergency Display Function

    1.11.1 Displaying the emergency information 1.11 EMERGENCY DISPLAY FUNCTION (1) Transmit the code “59” from the Jig RCU. This unit has a function for storing the history of the past two The FDP shows the emergency content in the form of emergencies (EMG) and displaying them on each FDP.

  • Page 19: Emergency Content Description

    1.11.3 Emergency content description Note: Emergency contents “E08/E09” are for the model with Dynamic Drum (DD). CONTENT CAUSE E01: Loading EMG When the mechanism mode cannot be changed to an- 1 The mechanism is locked in the middle of mode transition. 2 The mechanism is locked at the loading end due to the encoder position other mode even when the loading motor has rotated for more than 4 seconds in the loading direction, [E:01]...

  • Page 20: Emergency Detail Information 1

    1.11.4 Emergency detail information 1 : Mechanism Operation Mode [Table of MN] The status (electrical operation mode) of the VCR and the sta- tus (mechanism operation mode/sensor information) of the Display Mechanism Operation Mode Command standby (Status without executing command) mechanism in the latest emergency can be confirmed based on POWER OFF by EMG occurrence the figure in EMG detail information 1 .

  • Page 21: Emergency Detail Information 2

    1.11.5 Emergency detail information 2 : Mechanism Sensor Information 3 – [Common table of MN and HD] The type of the cassette tape and the cassette tape winding po- sition can be confirmed based on the figure in EMG detail infor- Mechanism Sensor Information Display S-VHS SW...

  • Page 22: Mechanism Adjustment (Vhs)

    SECTION 2 MECHANISM ADJUSTMENT (VHS) 2.1 BEFORE STARTING REPAIR AND ADJUSTMENT 2.1.1 Precautions (1) Unplug the power cable of the main unit 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.

  • Page 23: Jigs 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 24: Maintenance 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 25 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 26 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 27: 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 28 (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 29: Pinch Roller Arm Assembly

    2.2.6 Audio Control Head Notches Guide hole Notch 1. How to remove Relay gear (1) Remove the two screws (A) and remove the audio con- trol head together with the head base. (2) When replacing only the audio control head, remove the three screws (B) while controlling the compression spring.

  • Page 30: Capstan 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 31: 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 (1) Release the two lugs of the rotary encoder guide in the by pulling it up.

  • Page 32: 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 33: 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 34: 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 35: 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). (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 36: Upper Drum Assembly

    2.2.25 Upper Drum Assembly 1. How to remove (1) Remove the stator assembly and rotor assembly. (2) Loosen the screw of the collar assembly using a 1.5 mm hexagonal wrench and remove the collar assembly. Also remove the brush, spring and cap at one time. Lower drum assembly (3) Remove the upper drum assembly and remove the washer using tweezers.

  • Page 37: Compatibility Adjustment

    2.3 COMPATIBILITY ADJUSTMENT (6) Make sure that the V.PB FM waveform varies in parallel and linearly with the tracking operation again. When re- Notes: quired, perform fine-adjustment of the guide roller of the • Although compatibility adjustment is very important, pole base assembly (supply or take-up side).

  • Page 38: Checking/Adjustment Of The Height And Tilt Of The Audio Control Head

    (3) Press the channel buttons (+, –) simultaneously to enter the manual tracking mode. This also brings tracking to the center (centre). (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 39: Checking/Adjustment Of The Standard Tracking Preset

    [Perform adjustment steps (7) to (10) only for 2 Head (1) Play back the alignment tape (A). models equipped with LP mode.] (2) Apply the external trigger signal to D.FF (E), to observe the V.PB FM waveform at the measuring point (D). (7) Then play back the alignment tape (A2).
  • Page 40 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 41: Electrical Adjustment (Vhs)

    SECTION 3 ELECTRICAL ADJUSTMENT 3.1 PRECAUTION Jig RCU The following adjustment procedures are not only necessary [Data transmitting method] Depress the “ ” ( 3 ) button after replacement of consumable mechanical parts or board after the data code is set. assemblies, but are also provided as references to be re- ferred to when servicing the electrical circuitry.

  • Page 42: Servo Circuit

    (1) Record the signal (A2) in the mode (B1), and play back the recorded signal. (2) Press the channel buttons (+, –) simultaneously to enter the manual tracking mode. This also brings tracking to the center (centre). (3) Set the VCR to the FWD slow mode. (4) Transmit the code (F) from the Jig RCU to adjust so that Fig.

  • Page 43: Ee Y Level

    3.3.2 EE Y level • Signal (A1) Ext. input • (A2) Color (colour) bar signal [NTSC] • Mode • Equipment Oscilloscope Y level • Measuring point (D) Y OUT terminal (75Ø terminated) • EVR mode (F1) Jig RCU: Code “57” •...

  • Page 44: Video Eq (Frequency Response)

    (10) After adjustment, record the signal (A3) then playing it 100 kHz Scale 4 Four scale 1 MHz 2 MHz Frequency back again. At this time, confirm that there is no invert- (4 div.) marker (D2) ing phenomenon or noise appearing on the playback screen.

  • Page 45: Hdd Pb Y Level

    3.4.2 HDD PB Y level 3.5 AUDIO CIRCUIT • Notes: Signal (A1) Ext. input • (A2) Color(colour) bar signal[NTSC] • This adjustment should be done after the “REC color • (colour) level adjustment” for the video circuit has Mode been completed. •...

  • Page 46: Demodulator Circuit

    DEMODULATOR CIRCUIT (3) Set the VCR to the EVR mode by transmitting the code (F1) from the Jig RCU. Notes: (4) Set the EVR address to (F2) by pressing the button of • Unless otherwise specified in this demod circuit ad- the digit-key remote controller.

  • Page 47: Separation - 2

    (5) Adjust with the channel buttons (+,–) on the VCR (or on the remote controller) so that the level of the measuring point (D) becomes the specified value (G). (6) Release the EVR mode of the VCR by transmitting the code (F1) from the Jig RCU again.

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