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COPYRIGHT © 2003 VICTOR COMPANY OF JAPAN, LTD
SERVICE MANUAL
For disassembling and assembling of MECHANISM ASSEMBLY, refer to the SERVICE MANUAL No.86700(MECHANISM ASSEMBLY).
Specifications shown are for SP mode unless specified otherwise.
E. & O.E. Design and specifications subject to change without
notice.
GENERAL
Power requirement
AC 120 Vd, 60 Hz
Power consumption
Power on
: 16 W
Power off
1.5 W
Temperature
Operating
: 5
°C to 40 °C (41 °F to 104 °F)
Storage
: ­20
°C to 60 °C (­4 °F to140 °F)
Operating position
:
Dimensions (WxHxD)
435 mmx94 mmx242 mm
(17-3/16" x 3-3/4" x 9-3/4")
Weight
:
Format
:
Maximum recording time
SP
: 210 min. with ST-210 video cassette
EP
: 630 min. with ST-210 video cassette
VIDEO/AUDIO
Signal system
:
monochrome signal, 525 lines/
60 fields
Recording/Playback
system
:
scan system
Signal-to-noise ratio
45 dB
Horizontal resolution
VHS
230 lines
S-VHS
400 lines
Frequency range
Normal audio
70 Hz to 10,000 Hz
Hi-Fi audio
20 Hz to 20,000 Hz
Input/Output
:
S-video connectors (INx2, OUTx1)
TUNER
Tuning system
:
Channel coverage
VHF
Channels 2­13
UHF
:
CATV
:
RF output
Channel 3 when shipped) 75ohms,
unbalanced
TIMER
Clock reference
:
Program capacity
: 1-year programmable timer/
8 programs
Memory backup for timer is not supported.
ACCESSORIES
Provided accessories
:
"AA" battery x 2,
S-video cable (4-pin),
RF cable (F-type)
:
:
Horizontal only
:
2.7 kg (5.9 lbs)
S-VHS/VHS NTSC standard
NTSC-type color signal and EIA
DA-4 (Double Azimuth) head helical
:
:
:
:
:
RCA connectors (INx2, OUTx1)
Frequency-synthesized tuner
:
Channels 14­69
113 Channels
Channel 3 or 4 (switchable; preset to
:
Quartz
Infrared remote control unit,
No.82950
2003/03
HR-S3902US, HR-S3912US, HR-S3912UC,
HR-S5902US, HR-S5912US, HR-S5912UC
HR-S3902US, HR-S3912US, HR-S3912UC, HR-S5902US, HR-S5912US, HR-S5912UC V16S1,S15
VIDEO CASSETTE RECORDER
SPECIFICATIONS (The specifications shown pertain specifically to the model HR-S5902US.)
Regarding SCHEMATIC DIAGRAMS, refer to the service manual No. 82946 (HR-S2902US).
REW
FF
REC LINK
24HR QUICK
PROGRAM
S-VIDEO
POWER
INSERT
A.DUB


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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
Refer to the SERVICE MANUAL No.86700(MECHANISM ASSEMBLY)
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
3.1.7 EVR sdjustment ............................................................................. 3-2
3.2 Mechanism compatibility adjustment ......................................... 3-2
3.2.1 Tension pole position ............................................................ 3-3
3.2.2 FM waveform linearity .......................................................... 3-3
3.2.3 Height and tilt of the A/C head ............................................. 3-3
3.2.4 A/C head phase(X-value) ..................................................... 3-4
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 ........................................................ 3-5
3.3.2 Video circuit .......................................................................... 3-5
3.3.2.1 EE Y/PB Y(S-VHS/VHS)level .......................................... 3-5
4. CHARTS AND DIAGRAMS
Refer to the SERVICE MANUAL No.82946(HR-S2902US)
5. PARTS LIST
5.1 EXPLODED VIEW ...................................................................... 5-1
5.1.1 PACKING AND ACCESSORY ASSEMBLY<M1> ................ 5-1
5.1.2 FINAL ASSEMBLY<M2> ...................................................... 5-2
5.1.3 MECHANISM ASSEMBLY<M4> .......................................... 5-3
5.2 PARTS LIST ................................................................................ 5-4
PACKING AND ACCESSORY ASSEMBLY<M1> ........................... 5-4
FINAL ASSEMBLY<M2> ................................................................. 5-4
MECHANISM ASSEMBLY<M4> ..................................................... 5-4
MAIN BOARD ASSEMBLY<03> .................................................... 5-5
A/C HEAD BOARD ASSEMBLY<12> .......................................... 5-12
ADV.JOG/SW BOARD ASSEMBLY<38> ...................................... 5-12
LOADING MOTOR BOARD ASSEMBLY<55> ............................. 5-12
R.PAUSE BOARD ASSEMBLY<99> ............................................. 5-12
MODEL
HR-S3902US
ITEM
BODY COLOR
MOLD-BLACK PAINT-PURE SILVER PAINT-PURE SILVER
PAINT-BLACK
PAINT-PURE SILVER PAINT-PURE SILVER
RCU ILLUMI FUNCTION
NOT USED
NOT USED
NOT USED
USED(GLOW)
USED(GLOW)
USED(GLOW)
FLYING ERASE HEAD
NOT USED
NOT USED
NOT USED
USED
USED
USED
ZERO FRAME EDIT
NOT USED
NOT USED
NOT USED
USED
USED
USED
INSERT
NOT USED
NOT USED
NOT USED
USED
USED
USED
AUDIO DUBBING
NOT USED
NOT USED
NOT USED
USED
USED
USED
HR-S3912UC
HR-S3912US
HR-S5912US
HR-S5902US
HR-S5912UC
The following table indicates main different points between models HR-S3902US, HR-S3912US, HR-S3912UC, HR-S5902US, HR-
S5912US and HR-S5912UC.


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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


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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


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1-1
SECTION 1
DISASSEMBLY
1.1 Manually removing the cassette tape
If you cannot remove the cassette tape which is loaded be-
cause of any electrical or mechanical failures, manually remove
it by taking the following steps.
(1) Unplug the power cord plug from the power outlet.
(2) Refer to the disassembly procedure of the VCR and perform
the disassembly of the major parts before removing the
mechanism assembly. (See Fig. 1-1a.)
Fig. 1-1b
Fig. 1-1c
(3) Unload the pole base assembly by manually turning the gear
of the loading motor until the pole base assembly is hidden
behind the cassette lid. In doing so, hold the tape by the hand
to keep the slack away from any grease. (See Fig. 1-1b.)
In case of mechanical failures, while keeping the tension arm
assembly free from tension, pull out the tape on the pole
base assembly. Take the spring(a) of the pinch roller arm
assembly off the hook, and detach it from the tape.
(4) Remove the screw (a) of the side frame (L/R).
(5) Hold the slack tape and cassette cover together, lift the cas-
sette tape, top frame, cassette holder and side frames (L,
R) together from the rear and remove them by dis-engaging
the hooks (a) and (b).
Fig. 1-1a
Pole base assembly
Tension arm assembly
Pinch roller arm assembly
Direction of unloading
Spring(a)
Screw(a)
Screw(a)
Top frame
Cassette tape
Cassette holder
Side frame(R)
Side frame(L)
Hook(a)
Hook(b)
(6) Take up the slack of the tape into the cassette. This com-
pletes removal of the cassette tape.