SERVICE MANUAL
No.82913
March 2002
VIDEO CASSETTE RECORDER
SPECIFICATIONS (The specifications shown pertain specifically to the model HR-J790EU.)
This service manual is printed on 100% recycled paper.
COPYRIGHT © 2002 VICTOR COMPANY OF JAPAN, LTD
HR-J690EU, HR-J695EK, HR-J695MS,
HR-J790EU, HR-J795EK, HR-J795MS
V15D1/D14/D15
Specifications shown are for SP mode unless specified otherwise.
E. & O.E. Design and specifications subject to change without
notice.
GENERAL
Power requirement
: AC 220 V 240 V
, 50 Hz/60 Hz
Power consumption
Power on
: 15 W
Power off
: 4.0 W
Temperature
Operating
: 5
°C to 40°C
Storage
: 20
°C to 60°C
Operating position
: Horizontal only
Dimensions (W x H x D) : 400 mm x 94 mm x 270 mm
Weight
: 3.1 kg
Format
: VHS PAL standard
Maximum recording time
(SP)
: 240 min. with E-240 video cassette
(LP)
: 480 min. with E-240 video cassette
VIDEO/AUDIO
Signal system
: PAL-type colour signal and CCIR
monochrome signal, 625 lines
50 fields
Recording system
: DA4 (Double Azimuth) head helical
scan system
Signal-to-noise ratio
: 45 dB
Horizontal resolution
: 250 lines
Frequency range
Normal audio
: 70 Hz to 10,000 Hz
Hi-Fi audio
: 20 Hz to 20,000 Hz
Input/Output
: 21-pin SCART connectors:
IN/OUT x 1, IN/DECODER x 1
RCA connectors:
VIDEO IN x 1, AUDIO IN x 1,
AUDIO OUT x 1
TUNER/TIMER
TV channel storage
capacity
: 99 positions (+AUX position)
Tuning system
: Frequency synthesized tuner
Channel coverage
VHF
: 47 MHz 89 MHz/
104 MHz 300 MHz/
302 MHz 470 MHz
UHF
: 470 MHz 862 MHz
Aerial output
: UHF channels 22 69 (Adjustable)
Memory backup time
: Approx. 10 min.
ACCESSORIES
Provided accessories
: RF cable,
Infrared remote control unit,
"R6" battery x 2
Optional accessories
: Satellite Controller RM-SD1
TABLE OF CONTENTS
Section
Title
Page
Section
Title
Page
Important Safety Precautions
INSTRUCTIONS
1. DISASSEMBLY
1.1 Manually removing the cassette tape ......................... 1-1
1.2 Removing the major parts ........................................... 1-2
1.2.1 How to read the procedure table ........................... 1-2
1.2.2 Disassembly procedure ........................................ 1-2
1.3 Emergency display function ........................................ 1-4
1.3.1 Displaying the EMG information ........................... 1-4
1.3.2 Clearing the EMG history ...................................... 1-4
1.3.3 Details of the OSD display in the EMG display mode ... 1-5
1.3.4 EMG content description ....................................... 1-6
1.3.5 EMG detail information<1> ................................... 1-7
1.3.6 EMG detail information<2> ................................... 1-8
1.3.7 EMG detail information<3> ................................... 1-8
1.4 Service position ........................................................... 1-9
1.4.1 How to set the "Service position" .......................... 1-9
1.5 Jig RCU mode ............................................................. 1-9
1.5.1 Setting the Jig RCU mode .................................... 1-9
1.5.2 Setting the User RCU mode ................................. 1-9
1.6 Mechanism service mode ........................................... 1-9
1.6.1 How to set the "Mechanism service mode" ........... 1-9
1.6.2 How to exit from the "Mechanism service mode" .. 1-9
1.7 Maintenance and inspection ..................................... 1-10
1.7.1 Cleaning .............................................................. 1-10
1.7.2 Lubrication .......................................................... 1-10
1.7.3 Suggested servicing schedule for main components .. 1-10
2. MECHANISM
1. Before disassembling/assembling ................................ 2-1
1.1 Notes ........................................................................ 2-1
1.2 Mechanism operation check .................................... 2-1
1.3 Setting the mechanism assembling mode ............... 2-1
1.4 Layout of the main mechanism parts ....................... 2-2
1.5 Disassembling procedure table ................................ 2-3
2. Replacement of the main mechanism parts .................. 2-4
2.1 Cassette holder ........................................................ 2-4
2.2 A/C head .................................................................. 2-5
2.3 Guide arm, pinch roller arm ..................................... 2-6
2.4 Idler arm, idler gear 1/2 ............................................ 2-6
2.5 Main brake(T), brake lever, tension arm,reel disk(S/T), Rec safety lever .. 2-6
2.6 Press lever, control cam, capstan brake assembly,loading motor assembly .. 2-7
2.7 Capstan motor, load gear, control plate ................... 2-8
2.8 Clutch unit assembly, direct gear ............................. 2-9
3. Mechanism timing chart .............................................. 2-10
3. ADJUSTMENT
3.1 Before adjustment ....................................................... 3-1
3.1.1 Precaution .............................................................. 3-1
3.1.2 Required test equipments ..................................... 3-1
3.1.3 Required adjustment tools .................................... 3-1
3.1.4 Color(colour) bar signal, color(colour) bar pattern 3-1
3.1.5 Switch settings ...................................................... 3-1
3.1.6 Manual tracking mode (Auto tracking ON/OFF) setting 3-1
The following table lists the differing points between models HR-J690EU, HR-J695EK, HR-J695MS, HR-J790EU, HR-J795EK
and HR-J795MS.
3.2 Mechanism compatibility adjustment .......................... 3-2
3.2.1 Tension pole position ............................................. 3-2
3.2.2 FM waveform linearity ........................................... 3-2
3.2.3 Height and tilt of the A/C head .............................. 3-3
3.2.4 A/C head phase(X-value) ...................................... 3-3
3.3 Electrical Adjustment ................................................... 3-4
3.3.1 Servo circuit .......................................................... 3-4
3.3.1.1 Switching point ................................................. 3-4
3.3.1.2 Slow tracking preset ......................................... 3-4
3.3.2 Syscon circuit [HR-J690EU/J790EU] .................... 3-4
3.3.2.1 Timer clockl ...................................................... 3-4
4. CHARTS AND DIAGRAMS
4.1 BOARD INTERCONNECTIONS ................................. 4-3
4.2 MAIN(VIDEO/N.AUDIO) SCHEMATIC DIAGRAM ...... 4-5
4.3 MAIN(SYSCON) SCHEMATIC DIAGRAM .................. 4-7
4.4 MAIN(SECAM) SCHEMATIC DIAGRAM [HR-J695MS/J795MS] ..... 4-10
4.5 MAIN(SW.REG) SCHEMATIC DIAGRAM ................. 4-11
4.6 MAIN(TUNER) SCHEMATIC DIAGRAM ................... 4-13
4.7 MAIN(FMA) SCHEMATIC DIAGRAM ....................... 4-15
4.8 MAIN(FRONT) SCHEMATIC DIAGRAM ................... 4-17
4.9 MAIN(TERMINAL) SCHEMATIC DIAGRAM ............. 4-19
4.10 MAIN(VPS/PDC SLICER) SCHEMATIC DIAGRAM .. 4-21
4.11 ADV.JOG SCHEMATIC DIAGRAM [HR-J790EU/J795EK/J795MS] ... 4-22
4.12 MAIN, R.PAUSE AND SAT CTL CIRCUIT BOARDS .. 4-23
4.13 REMOTE CONTROLLER SCHEMATIC DIAGRAM .. 4-26
4.14 FDP GRID ASSIGNMENT AND ANODE CONNECTION ... 4-26
4.15 WAVEFORMS ......................................................... 4-27
4.16 VOLTAGE CHARTS ................................................ 4-28
4.17 CPU PIN FUNCTION .............................................. 4-29
4.18 SYSTEM CONTROL BLOCK DIAGRAM ................ 4-31
4.19 VIDEO BLOCK DIAGRAM ...................................... 4-33
4.20 AUDIO BLOCK DIAGRAM ...................................... 4-35
5. PARTS LIST
5.1 PACKING AND ACCESSORY ASSEMBLY<M1> ....... 5-1
5.2 FINAL ASSEMBLY<M2> ............................................. 5-2
5.3 MECHANISM ASSEMBLY<M4> ................................. 5-4
5.4 ELECTRICAL PARTS LIST ......................................... 5-6
MAIN BOARD ASSEMBLY<03> ..................................... 5-6
A/C HEAD BOARD ASSEMBLY<12> ........................... 5-14
ADV.JOG BOARD ASSEMBLY<38> [HR-J790EU/J795EK/J795MS] . 5-14
LOADING MOTOR BOARD ASSEMBLY<55> .............. 5-14
R.PAUSE BOARD ASSEMBLY<91> [HR-J790EU/J795MS] .. 5-14
SAT CTL BOARD ASSEMBLY<94> .............................. 5-14
Notes: Mark
is same as left.
MODEL
HR-J690EU
ITEM
POWER PLUG
CEE(CLASSII)
3PIN(CLASSII)
CEE(CLASSII)
CEE(CLASSII)
3PIN(CLASSII)
CEE(CLASSII)
ADVANCED JOG
NOT USED
USED
VIDEO SYSTEM
PAL/MESECAM(MANUAL)
PAL
PAL/MESECAM/SECAM PAL/MESECAM(MANUAL)
PAL
PAL/MESECAM/SECAM
FRONT VIDEO/AUDIO IN
NOT USED
USED
NOT USED
USED
REMOTE PAUSE
NOT USED
USED
NOT USED
USED
BROADCASTING STANDARD
"B/G,D/K"
I
"L,L',B/G"
"B/G,D/K"
I
"L,L',B/G"
STEREO DECODER
NICAM/A2
NICAM
"NICAM(L,B/G)/A2(B/G)"
NICAM/A2
NICAM
"NICAM(L,B/G)/A2(B/G)"
RF OUT SYSTEM [INITIAL]
"G,K"
I
NOT USED
"G,K"
I
NOT USED
VCR PLUS+
SHOWVIEW DELUXE VIDEOPLUS+ DELUXE SHOWVIEW DELUXE
VIDEOPLUS+ DELUXE SHOWVIEW DELUXE
LANGUAGE [INITIAL](ON SCREEN DISPLAY)
13LANG.[E]
ENG
FRE
13LANG.[E]
ENG
FRE
AUDIO DUBBING / OPERATION
NOT USED
NOT USED
NOT USED
USED/BUTTON
NOT USED
USED/BUTTON
HR-J695MS
HR-J695EK
HR-J795EK
HR-J790EU
HR-J795MS
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.
Fig.1
1. Locations requiring special caution are denoted by labels and
inscriptions on the cabinet, chassis and certain parts of the
product. When performing service, be sure to read and com-
ply with these and other cautionary notices appearing in the
operation and service manuals.
2. Parts identified by the
symbol and shaded (
) parts are
critical for safety.
Replace only with specified part numbers.
Note: Parts in this category also include those specified to com-
ply with X-ray emission standards for products using
cathode ray tubes and those specified for compliance
with various regulations regarding spurious radiation
emission.
3. Fuse replacement caution notice.
Caution for continued protection against fire hazard.
Replace only with same type and rated fuse(s) as specified.
4. Use specified internal wiring. Note especially:
1) Wires covered with PVC tubing
2) Double insulated wires
3) High voltage leads
5. Use specified insulating materials for hazardous live parts.
Note especially:
1) Insulation Tape
3) Spacers
5) Barrier
2) PVC tubing
4) Insulation sheets for transistors
6. When replacing AC primary side components (transformers,
power cords, noise blocking capacitors, etc.) wrap ends of
wires securely about the terminals before soldering.
Power cord
Fig.2
10. Also check areas surrounding repaired locations.
11. Products using cathode ray tubes (CRTs)
In regard to such products, the cathode ray tubes themselves,
the high voltage circuits, and related circuits are specified for
compliance with recognized codes pertaining to X-ray emission.
Consequently, when servicing these products, replace the cath-
ode ray tubes and other parts with only the specified parts.
Under no circumstances attempt to modify these circuits.
Unauthorized modification can increase the high voltage value
and cause X-ray emission from the cathode ray tube.
12. Crimp type wire connector
In such cases as when replacing the power transformer in sets
where the connections between the power cord and power
transformer primary lead wires are performed using crimp type
connectors, if replacing the connectors is unavoidable, in or-
der to prevent safety hazards, perform carefully and precisely
according to the following steps.
1) Connector part number : E03830-001
2) Required tool : Connector crimping tool of the proper type
which will not damage insulated parts.
3) Replacement procedure
(1) Remove the old connector by cutting the wires at a point
close to the connector.
Important : Do not reuse a connector (discard it).
Fig.7
cut close to connector
Fig.3
(2) Strip about 15 mm of the insulation from the ends of
the wires. If the wires are stranded, twist the strands to
avoid frayed conductors.
15 mm
Fig.4
(3) Align the lengths of the wires to be connected. Insert
the wires fully into the connector.
Connector
Metal sleeve
Fig.5
(4) As shown in Fig.6, use the crimping tool to crimp the
metal sleeve at the center position. Be sure to crimp fully
to the complete closure of the tool.
1
Precautions during Servicing
7. Observe that wires do not contact heat producing parts
(heatsinks, oxide metal film resistors, fusible resistors, etc.)
8. Check that replaced wires do not contact sharp edged or
pointed parts.
9. When a power cord has been replaced, check that 10-15 kg of
force in any direction will not loosen it.
1.25
2.0
5.5
Crimping tool
Fig.6
(5) Check the four points noted in Fig.7.
Not easily pulled free
Crimped at approx. center
of metal sleeve
Conductors extended
Wire insulation recessed
more than 4 mm
S40888-01
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 compli-
ance with safety standards.
1. Insulation resistance test
Confirm the specified insulation resistance or greater between power cord plug prongs and
externally exposed parts of the set (RF terminals, antenna terminals, video and audio input
and output terminals, microphone jacks, earphone jacks, etc.). See table 1 below.
2. Dielectric strength test
Confirm specified dielectric strength or greater between power cord plug prongs and exposed
accessible parts of the set (RF terminals, antenna terminals, video and audio input and output
terminals, microphone jacks, earphone jacks, etc.). See table 1 below.
3. Clearance distance
When replacing primary circuit components, confirm specified clearance distance (d), (d') be-
tween soldered terminals, and between terminals and surrounding metallic parts. See table 1
below.
4. Leakage current test
Confirm specified or lower leakage current between earth ground/power cord plug prongs
and externally exposed accessible parts (RF terminals, antenna terminals, video and audio
input and output terminals, microphone jacks, earphone jacks, etc.).
Measuring Method : (Power ON)
Insert load Z between earth ground/power cord plug prongs and externally exposed accessi-
ble parts. Use an AC voltmeter to measure across both terminals of load Z. See figure 9 and
following table 2.
5. Grounding (Class 1 model only)
Confirm specified or lower grounding impedance between earth pin in AC inlet and externally exposed accessible parts (Video in,
Video out, Audio in, Audio out or Fixing screw etc.).
Measuring Method:
Connect milli ohm meter between earth pin in AC inlet and exposed accessible parts. See figure 10 and grounding specifications.
d'
d
Chassis
Power cord,
primary wire
Region
USA & Canada
Europe & Australia
Grounding Impedance (Z)
Z
0.1 ohm
Z
0.5 ohm
AC inlet
Earth pin
Exposed accessible part
Milli ohm meter
Grounding Specifications
Fig. 10
ab
c
V
Externally
exposed
accessible part
Z
Fig. 9
Fig. 8
Clearance Distance (d), (d')
d, d'
3 mm
d, d'
4 mm
d, d'
3.2 mm
1 M
R 12 M/500 V DC
Dielectric Strength
AC 1 kV 1 minute
AC 1.5 kV 1 miute
AC 1 kV 1 minute
AC Line Voltage
100 V
100 to 240 V
110 to 130 V
110 to 130 V
200 to 240 V
Japan
USA & Canada
Europe & Australia
R
10 M
/500 V DC
Region
Insulation Resistance (R)
R
1 M
/500 V DC
AC 3 kV 1 minute
(Class
2)
AC 1.5 kV 1 minute
(Class
1)
d
4 mm
d'
8 mm (Power cord)
d'
6 mm (Primary wire)
Table 1 Specifications for each region
a, b, c
Leakage Current (i)
AC Line Voltage
100 V
110 to 130 V
110 to 130 V
220 to 240 V
Japan
USA & Canada
i
1 mA rms
Exposed accessible parts
Exposed accessible parts
Antenna earth terminals
Other terminals
i
0.5 mA rms
i
0.7 mA peak
i
2 mA dc
i
0.7 mA peak
i
2 mA dc
Europe & Australia
Region
Load Z
1 k
2 k
1.5 k
0.15
µF
50 k
Table 2 Leakage current specifications for each region
Note: These tables are unofficial and for reference only. Be sure to confirm the precise values for your particular country and locality.
2
S40888-01