JVC HR-XVC28BUS User manual

SERVICE MANUAL
COPYRIGHT © 2005 Victor Company of Japan, Limited No.YD052
2005/3
DVD PLAYER & VIDEO CASSETTE RECORDER
YD05220053
HR-XVC28BUC, HR-XVC28BUS,
HR-XVC29SUC, HR-XVC29SUS
For disassembling and assembling of MECHANISM ASSEMBLY, refer to the SERVICE MANUAL No.86700(MECHANISM ASSEMBLY).
TABLE OF CONTENTS
1 PRECAUTION. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3
2 SPECIFIC SERVICE INSTRUCTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-7
3 DISASSEMBLY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-9
4 ADJUSTMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-15
5 TROUBLESHOOTING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-22
HR-XVC28BUC, HR-XVC28BUS, HR-XVC29SUC, HR-XVC29SUS [D5PV1]

1-2 (No.YD052)
SPECIFICATION
• Specifications shown are for SP mode unless otherwise specified.
• E.& O.E. Design and specifications subject to change without notice.
• Manufactured under license from Dolby Laboratories. "Dolby" and the double-D symbol are trademarks of Dolby Laboratories.
• "DTS" and "DTS 2.0 + Digital Out" are trademarks of Digital Theater Systems, Inc.
GENERAL
Power requirement AC 120 V, 60 Hz
Power consumption
Power on 25 W
Power off 2.0 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 Horizontal only
Dimensions (W ×H ×D) 435 mm x 93 mm x 272 mm
Weight 4.1 kg (9.1Ibs)
Format VHS NTSC standard
Maximum recording time
(SP) 210 min. with T-210 video cassette
(EP) 630 min. with T-210 video cassette
VIDEO/AUDIO (VCR deck)
Signal system NTSC color signal and EIA monochrome signal, 525 lines/60 fields
Recording system DA4 (Double Azimuth) head helical scan system
Signal-to-noise ratio 45 dB
Horizontal resolution 230 lines
Frequency range 70 Hz to 10,000 Hz (Normal audio) 20 Hz to 20,000 Hz (Hi-Fi audio)
Input/Output RCA connectors: IN ×1, OUT ×1
VIDEO/AUDIO (DVD deck)
Signal system NTSC
Applicable disc DVD (12 cm, 8 cm), CD (12 cm, 8 cm)
Audio characteristics DVD:4 Hz - 22 KHz
Frequency response CD:4 Hz - 20 KHz
S/N Ratio 90 dB
Harmonic distortion 0.1%
Wow and flutter Below Measurable Level
Dynamic range 90 dB
Output
Component-Y (RCA) 1.0 Vp-p/75 Ω
Component-PB/PR (RCA) 0.7 Vp-p/75 Ω
Audio (RCA) 2 Vrms, 1 KΩ
Digital Audio (COAXIAL) 0.5 Vp-p/75 Ω
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 Ω, unbalanced
TIMER
Clock reference Quartz
Program capacity 1-year programmable timer/8 programs
ACCESSORIES
Provided accessories RF cable, Infrared remote control unit, "AA" battery ×2

(No.YD052)1-3
SECTION 1
PRECAUTION
1.1 SAFTY PRECAUTIONS
Prior to shipment from the factory, JVC products are strictly in-
spected to conform with the recognized product safety and elec-
trical 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.
1.1.1 Precautions during Servicing
(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
comply 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
comply with X-ray emission standards for products
using cathode ray tubes and those specified for
compliance with various regulations regarding spu-
rious radiation emission.
(3) Fuse replacement caution notice.
Caution for continued protection against fire hazard.
Replace only with same type and rated fuse(s) as speci-
fied.
(4) Use specified internal wiring. Note especially:
• Wires covered with PVC tubing
• Double insulated wires
• High voltage leads
(5) Use specified insulating materials for hazardous live parts.
Note especially:
• Insulation Tape
• PVC tubing
•Spacers
• Insulation sheets for transistors
•Barrier
(6) When replacing AC primary side components (transformers,
power cords, noise blocking capacitors, etc.) wrap ends of
wires securely about the terminals before soldering.
Fig.1-1-1
(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.
Fig.1-1-2
(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 volt-
age circuits, and related circuits are specified for compli-
ance with recognized codes pertaining to X-ray emission.
Consequently, when servicing these products, replace the
cathode ray tubes and other parts with only the specified
parts. Under no circumstances attempt to modify these cir-
cuits.Unauthorized modification can increase the high volt-
age value and cause X-ray emission from the cathode ray
tube.
(12) Crimp type wire connectorIn such cases as when replacing
the power transformer in sets where the connections be-
tween the power cord and power trans former primary lead
wires are performed using crimp type connectors, if replac-
ing the connectors is unavoidable, in order to prevent safe-
ty hazards, perform carefully and precisely according to the
following steps.
•Connector part number :E03830-001
•Required tool : Connector crimping tool of the proper
type which will not damage insulated parts.
•Replacement procedure
a) Remove the old connector by cutting the wires at a
point close to the connector.Important : Do not re-
use a connector (discard it).
Fig.1-1-3
b) 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.
Fig.1-1-4
c) Align the lengths of the wires to be connected. In-
sert the wires fully into the connector.
Fig.1-1-5
d) As shown in Fig.1-1-6, 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.
Fig.1-1-6
e) Check the four points noted in Fig.1-1-7.
Fig.1-1-7
Power cord
cut close to connector
15 mm
Connector
Metal sleeve
1.25
2.0
5.5
Crimping tool
Not easily pulled free Crimped at approx. cente
r
of metal sleeve
Conductors extended
Wire insulation recessed
more than 4 mm

1-4 (No.YD052)
1.1.2 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 be-
tween power cord plug prongs and externally exposed
parts of the set (RF terminals, antenna terminals, video and
audio input and output terminals, microphone jacks, ear-
phone 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 Fig.1-1-11 below.
(3) Clearance distance
When replacing primary circuit components, confirm spec-
ified clearance distance (d), (d') between soldered termi-
nals, and between terminals and surrounding metallic
parts. See Fig.1-1-11 below.
Fig.1-1-8
(4) Leakage current test
Confirm specified or lower leakage current between earth
ground/power cord plug prongs and externally exposed ac-
cessible parts (RF terminals, antenna terminals, video and
audio input and output terminals, microphone jacks, ear-
phone jacks, etc.).
Measuring Method : (Power ON)Insert load Z between
earth ground/power cord plug prongs and externally ex-
posed accessible parts. Use an AC voltmeter to measure
across both terminals of load Z. See Fig.1-1-9 and follow-
ing Fig.1-1-12.
Fig.1-1-9
(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 Fig.1-1-10 and grounding
specifications.
Fig.1-1-10
Fig.1-1-11
Fig.1-1-12
NOTE :
These tables are unofficial and for reference only. Be sure to confirm the precise values for your particular country and locality.
Chassis
Power cord
primary wire
d'
d
ab
c
V
A
Externally
exposed
accessible part
Z
Exposed accessible part
Grounding Specifications
AC inlet
Region
USA & Canada
Europe & Australia
Grounding Impedance (Z)
Z 0.1 ohm
Z 0.5 ohm
Earth pin
MIlli ohm meter
AC Line Voltage Region
Japan
Europe & Australia
R 1 M /500 V DC
USA & Canada 1 M R 12 M /500 V DC
R 10 M /500 V DC
Insulation Resistance (R)Dielectric Strength Clearance Distance (d), (d')
100 V
100 to 240 V
110 to 130 V
110 to 130 V
200 to 240 V
AC 1 kV 1 minute
AC 1.5 kV 1 minute
AC 1 kV 1 minute
(Class )
(Class )
AC 3 kV 1 minute
AC 1.5 kV 1 minute
d, d' 3 mm
d, d' 4 mm
d, d' 3.2 mm
d' 8 m m (Power cord)
d' 6 m m (Primary wire)
d 4 m m
AC Line Voltage Region
Japan
Europe & Australia
USA & Canada
Load Z Leakage Current (i) a, b, c
100 V
110 to 130 V
110 to 130 V
220 to 240 V
i 1 mA rms
i 0.5 mA rms
i 0.7 mA peak
i 2 mA dc
i 0.7 mA peak
i 2 mA dc
Exposed accessible parts
Exposed accessible parts
Antenna earth terminals
Other terminals
1
1.5
2
50
0.15

(No.YD052)1-5
1.2 Preventing static electricity
Electrostatic discharge (ESD), which occurs when static electricity stored in the body, fabric, etc. is discharged, can destroy the laser
diode in the traverse unit (optical pickup). Take care to prevent this when performing repairs.
1.2.1 Grounding to prevent damage by static electricity
Static electricity in the work area can destroy the optical pickup (laser diode) in devices such as DVD players.
Be careful to use proper grounding in the area where repairs are being performed.
(1) Ground the workbench
Ground the workbench by laying conductive material (such as a conductive sheet) or an iron plate over it before placing the
traverse unit (optical pickup) on it.
(2) Ground yourself
Use an anti-static wrist strap to release any static electricity built up in your body.
(3) Handling the optical pickup
• In order to maintain quality during transport and before installation, both sides of the laser diode on the replacement optical
pickup are shorted. After replacement, return the shorted parts to their original condition.
(Refer to the text.)
• Do not use a tester to check the condition of the laser diode in the optical pickup. The tester's internal power source can easily
destroy the laser diode.

1-6 (No.YD052)
1.3 Precautions for Service
1.3.1 Handling of Traverse Unit and Laser Pickup
(1) Do not touch any peripheral element of the pickup or the actuator.
(2) The traverse unit and the pickup are precision devices and therefore must not be subjected to strong shock.
(3) Do not use a tester to examine the laser diode. (The diode can easily be destroyed by the internal power supply of the tester.)
(4) To replace the traverse unit, pull out the metal short pin for protection from charging.
(5) When replacing the pickup, after mounting a new pickup, remove the solder on the short land which is provided at the center of
the flexible wire to open the circuit.
(6) Half-fixed resistors for laser power adjustment are adjusted in pairs at shipment to match the characteristics of the optical block.
Do not change the setting of these half-fixed resistors for laser power adjustment.
1.3.2 Destruction of Traverse Unit and Laser Pickup by Static Electricity
Laser diodes are easily destroyed by static electricity charged on clothingor the human body. Before repairing peripheral elements of
the traverse unit or pickup, be sure to take the following electrostatic protection:
(1) Wear an antistatic wrist wrap.
(2) With a conductive sheet or a steel plate on the workbench on which the traverse unit or the pick up is to be repaired, ground the
sheet or the plate.
(3) It solders to two short circuit sections on the substrate of a pick-up.
(4) After removing the flexible wire from the connector (CN101), short-circuit the flexible wire by the metal clip.
(5) Short-circuit the laser diode by soldering the land which is provided at the center of the flexible wire for the pickup.
After completing the repair, remove the solder to open the circuit.
Pick-up
Short circuit
* Please refer to the SECTION3 DISASSEMBLY method for details.
CN101
DVD SERVO CONTROL BOARD

(No.YD052)1-7
SECTION 2
SPECIFIC SERVICE INSTRUCTIONS
2.1 Different table of feature
The following table indicates main different points between models HR-XVC28BUC, HR-XVC28BUS, HR-XVC29SUC and HR-
XVC29SUS.
NOTE :
Mark ←is same as left.
2.2 Service position
This unit has been designed so that the Mechanism and Main
board assemblies can be removed together from the bottom
chassis. Before diagnosing or servicing the circuit boards, take
out the major parts from the bottom chassis.
2.2.1 How to set the "Service position"
(1) Refer to the disassembly procedure and perform the disas-
sembly of the major parts before removing the Mechanism
assembly.
(2) Remove the screws that fix the Mechanism, Main board as-
sembly to the bottom chassis. If any other screws are used
to fix the boards, remove them also.
(3) Remove the combined Mechanism and Main board assem-
blies.
(4) If any other major parts are used, remove them also.
(5) Connect the wires and connectors of the major parts that
have been removed in steps (1) to (4). (Refer to Fig. 2-2a.)
(6) Place the combined Mechanism, Main board and other
board assemblies upside down.
(7) Insert the power cord plug into the power outlet and then
proceed with the diagnostics and servicing of the board as-
sembly.
Notes:
•Before inserting the power cord plug into the power out-
let, make sure that none of the electrical parts are able
to short-circuit between the workbench and the board
assembly.
•For the disassembly procedure of the major parts and
details of the precautions to be taken, see "Removing
the major parts".
•If there are wire connections from the Main board and
Mechanism assemblies to the other major parts, be sure
to remove them (including wires connected to the major
parts) first before performing step (2).
•When carrying out diagnosis and repair of the Main
board assembly in the "Service position", be sure to
ground both the Main board and Mechanism assem-
blies. If they are improperly grounded, there may be
noise on the playback picture or FDP counter display
may move even when the mechanism is kept in an inop-
erative status.
•In order to diagnose the playback or recording of the
cassette tape, set the Mechanism assembly to the re-
quired mode before placing it upside down. If the mech-
anism mode is changed (including ejection) while it is in
an upside down position the tape inside may be dam-
aged.
•For some models, the mechanism and board assem-
blies are attached by connectors only. When carrying
out a diagnosis or repair of the boards in the "Service
position", make sure that the connectors are not dis-
connected.
Fig.2-2a
2.3 Jig RCU mode
This unit uses the following two modes for receiving remote con-
trol codes.
(1) User RCU mode:Ordinary mode for use by the user.
(2) Jig RCU mode: Mode for use in production and servicing.
When using the Jig RCU, it is required to set the VCR to the Jig
RCU mode (the mode in which codes from the Jig RCU can be
received). As both of the above two modes are stored in the EE-
PROM, it is required to set the VCR back to the User RCU mode
each time that an adjustment is made or to check that the neces-
sary operations have been completed.These modes can be set
by the operations described below.
Note:
•Confirm the RCU mode when exchanged parts. Since
some SERVICE PARTS sets the VCR to the Jig RCU
mode as initial setting. Therefore please set the VCR to
the user RCU mode after replacing the EEPROM.
HR-XVC28BUC HR-XVC28BUS HR-XVC29SUC HR-XVC29SUS
BODY COLOR BLACK ←PURE SILVER ←
MP3 PLAYBACK USED NOT USED USED NOT USED
TP111 D.FF
TP4001 CTL.P
TP106 PB FM
TP2253 A.PB FM Main board assembly
Display board assembly Switch/jack board assembly

1-8 (No.YD052)
Fig.2-3a User/Jig RCU mode
2.3.1 Setting the Jig RCU mode
(1) Turn on the power.
(2) Press the following remocon keys continuously within 2
seconds " SET UP " →" 2 " →" 8 " →" ENTER ".
When the VCR is set to the Jig RCU mode, the symbols
( " : " ) in the time display of the FDP are turned off.
(Refer to Fig.2-3a)
2.3.2 Setting the User RCU mode
(1) Turn off the power.
(2) Press the "REC" and "PAUSE" buttons of the VCR simul-
taneously. Alternatively, transmit the code "43-80" from the
Jig RCU.
2.4 Mechanism service mode
This model has a unique function to enter the mechanism into ev-
ery operation mode without loading of any cassette tape. This
function is called the "Mechanism service mode".
2.4.1 How to set the "Mechanism service mode"
(1) Set the VCR to the Jig RCU mode (the mode in which
codes from the Jig RCU can be received)
(2) Transmit the code "43-E5" from the Jig RCU.
(3) Release the lug of the Cassette holder and then slide the
Cassette holder toward the direction where the Cassette
holder is loaded by manually.
(4) The cassette holder lowers and, when the loading has
completed, the mechanism enters the desired mode.
When the VCR is set to the Mechanism service mode, the
symbols ("Timer") in the FDP (LED) are blinked.
2.4.2 How to exit from the "Mechanism service mode"
(1) Unplug the power cord plug from the power outlet.
2.5 Maintenance and inspection
2.5.1 Cleaning
Regular cleaning of the transport system parts is desirable but
practically impossible. So make it a rule to carry out cleaning 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 disappear, re-
sulting in possible tape damage.
Note:
•Absolutely avoid sweeping the upper drum vertically as
this will cause damage to the video head.
(1) When cleaning the upper drum (especially the video head),
soak a piece of closely woven cloth with alcohol and while
holding the cloth onto the upper drum by the fingers, turn
the upper drum counterclockwise.
(2) To clean the parts of the tape transport system other than
the upper drum, use a piece of closely woven cloth or a cot-
ton swab soaked with alcohol.
(3) After cleaning, make sure that the cleaned parts are com-
pletely dry before using the cassette tape.
Fig.2-5a
2.5.2 Lubrication
With no need for periodical lubrication, you have only to lubricate
new parts after replacement. If any oil or grease on contact parts
is soiled, wipe it off and newly lubricate the parts.
Note:
•See the "mechanism assembly" diagram of the "parts
list" for the lubricating or greasing spots, and for the
types of oil or grease to be used.
2.5.3 Suggested servicing schedule for main components
The following table indicates the suggested period for such ser-
vice measures as cleaning, lubrication and replacement. In prac-
tice, the indicated periods will vary widely according to
environmental and usage conditions. However, the indicated
components should be inspected when a set is brought for ser-
vice and the maintenance work performed if necessary. Also
note that rubber parts may deform in time, even if the set is not
used.
C : Cleaning
X : Inspection or Replacement if necessary
User RCU mode
Jig RCU mode
( not displayed)
System Parts name Operation hours
1000H 2000H
Tape
transport
Drum assembly C,X X
A/C head C,X C,X
Pinch roller arm assembly C C
Full erase head C C
Tension arm assembly C C
Capstan motor (Shaft) C C
Guide arm assembly C C
Drive
Capstan motor X
Capstan brake assembly X
Main brake assembly X
Belt (Capstan) X X
Loading motor X
Clutch unit X
Worm gear X
Control plate X
Other Rotary encoder X
Video heads
A/C head

(No.YD052)1-9
SECTION 3
DISASSEMBLY
3.1 Removing the major parts
3.1.1 Destination of connectors
Destination of connectors
3.1.2 How to read the procedure table
This table shows the steps for disassembly of the externally fur-
nished parts and board assemblies. Reverse these steps when
re-assembling them.
(1) Order of steps in Procedure
When reassembling, perform the step(s) in the reverse or-
der.
These numbers are also used as the identification (loca-
tion) No. of parts Figures.
(2) Part name to be removed or installed.
(3) Fig. No. showing procedure or part location.
(4) Identification of part to be removed, unhooked, unlocked,
released, unplugged, unclamped or unsoldered.
P= Spring, W= Washer, S= Screw, L= Locking tab, SD=
Solder, CN**(WR**)= Remove the wire (WR**) from the
connector (CN**).
Note:
•The bracketed ( ) WR of the connector symbol are
assigned nos. in priority order and do not corre-
spond to those on the spare parts list.
(5) Adjustment information for installation
3.1.3 Disassembly procedure
<Note 2a>
• Be careful not to damage the connector and wire etc. during
connection and disconnection.
• When connecting the flat wire to the connector, be careful with
the flat wire direction.
<Note 2b>
• When reattaching the Front panel assembly, make sure that
the door opener of the Side frame (R) is lowered in position pri-
or to the reinstallation.
• When reattaching the Front panel assembly, pay careful attention
to the switch lever of the Front panel assembly not to make it
touch the switch knob of the Main board assembly from the side.
• When reattaching the Front panel assembly, lift the Cassette
door slightly.
Fig.3-1a
<Note 3a>
• When reattaching the Mechanism assembly, secure the
screws (S3a to S3b) in the order of 1,2,3.
<Note 3b>
• When reattaching the Mechanism assembly, be sure to align
the phase of the Rotary encoder on the Main board assembly.
• When reattaching the Mechanism assembly, set the "Mecha-
nism assembling mode". [See "MECHANISM ASSEMBLY
SERVICE MANUAL (No. 86700)".]
• When reattaching the Mechanism assembly to the Main board
assembly, take care not to damage the sensors and switch on
the Main board assembly.
WR2a
WR2b
Main CN101
Main CN103
40
10
CONN. No. PIN No.CONNECTOR
Two kinds of double-arrows in connection tables respectively
show kinds of connector/wires.
: The connector of the side to remove
: Wire: Flat wire : Board to board (B-B)
Digital CN761
Digital CN762
CONN. No. PIN No.CONNECTOR
WR2a
WR2b
WR3a
WR3b
WR4a
WR4b
WR4c
Main
Main
Main
Drum
assembly
Main
Main
Main
CN7103
CN3102
CN2001
CN7302
CN7301
CN3301
Switch/jack
Display
A/C head
Main
DVD
servo control
DVD
servo control
DVD
servo control
CN7191
CN7003
CN1
CN503
CN501
CN1
10
22
6
9
17
19
5
(1) (2) (3) (4) (5)
Step/
Loc No.
Part Name Fig.
No. Point Note
[1] Top cover 3-1a 4(S1a),(S1b),3(L1a), <Note 1a>
2(SD1a),(P1a),(W1a),
CN1(WR1a),
Bracket 2(S1c)
----------------------------------------
Step/
Loc No.
Part Name No.
Fig. Point Note
Top cover
Front panel assembly
(Display board assembly)
(
Switch/jack board assembly )
Mechanism assembly
(Drum assembly)
DVD unit
(Bracket)
Rear cover
Main board assembly
3-1d
3-1a
3-1d
3-1b
3-1c
3-1d
3-1d
3-1d
3-1d
8(S1a)
4(L2a),5(L2b),2(S2a)
CN7103(WR2a),
CN3102(WR2b)
CN2001(WR3a)
3(S3a),(S3b)
CN(WR3b)
(S3c),(S3d),(S3e)
3(S4a),3(S4b),
CN7302(WR4a),
CN7301(WR46),
CN3301(WR4c)
5(S5a),5(L5a)
3(S6a)
<Note 2a>
<Note 2b>
<Note 2a>
<Note 3a>
<Note 3b>
<Note 3c>
--------------------------
[1]
[2]
[3]
[4]
[5]
[6]
Door
opener
Side
frame(R) Switch
knob
Switch
lever

1-10 (No.YD052)
<Note 3c>
• When reattaching the Drum assembly, secure the screws (S3c
to S3e) in the order of c, d, e.
Fig.3-1b
• When handling the drum assembly alone, hold it by the motor
or shaft. Be careful not to touch other parts, especially the vid-
eo heads. Also take care not to damage the connectors.
Fig.3-1c
<Note 3c>
(S3c)
(S3c)
(S3e) (S3e)
(S3d)
(S3d)
Mechanism
assembly
Drum
assembly
<NOTE>
Attach the Drum assembly appropriately,
since the installation state of the Drum assembly
influences the FM WAVEFORM LINEARITY
greatly.
HOOK
Shaft
Video heads
Motor

(No.YD052)1-11
Fig.3-1d
(L2a)
(L2a)
(L2b)
(L2b)
(L2b)
(L2b)
(S2a)
Cassette door
<Note 2b>
[2]Front panel
assembly
TU6001
JS3001
e
j
b
a
a
c
i
i
i
i
i
f
j
c
m
[3]Mechanism
assembly
[3]Drum assembly
[6]Main board assembly
Bottom chassis
(S3a)
(S3a)
(S3b)
(S3e)
(S3c) (S3d)
(S6a) (S6a)
(S6a)
(S3a)
3
2
DVD bracket
board assembly
i
i
i
i
i
(S5a)
(S5a)
(S5a)
(L5a)
(L5a)
(L5a)
(L5a)
(L5a)
[5]Rear cover
d
d
d
d
d
c
e
b
c
j
f
j
LP*****
[4]DVD unit
[4]Bracket
(S4a)
(S4a)
(S4a)
(S4b)
(S4b)
(S4b)
[1]Top cover
1
(S1a)
(S1a)
(S1a)
(S1a)
(S1a)
(S1a)
j
j
j
j
TOP SIDE
BOTTOM SIDE
Switch/jack board assembly
Display board assembly
CN7191
CN7003
2
1
34
12
3
4
5
(WR2b)
<Note 2a>
(WR2a)
<Note 2a>
3.Insert the wire to even the root of connector completely
at the same time as inserting each wire.
4.Check to see that outside parts.
TOP COVER,BOTTOM COVER,FRONT PANEL, etc
are fixed certainly to the BOTTOM CHASSIS
5.Pay attention NOT to make any scratches
on FRONT PANEL.
6.Pay close attention not to cut any
Sheath of WIRE by sharp edge
of CHASSIS while Wireing Process.
CN7103
from FRONT PANEL
(JACK CN7191)
A/C HEAD
CN2001
CN3102
CN7302 CN7301
CN3301
CN503 CN501
back side
right side
CN1
(WR4a)
<Note 2b>
(WR4c)
<Note 2b>
(WR3a)
(WR3a)
<Note 2b>
<Note 2b>
(WR3a)
<Note 2b>
(WR3b)
<Note 2b>
(WR4b)
<Note 2b>
Make a crease.
<Phase alignment>
.Accord the position of V gap on R.ENCORDER and PWB silk
.Accord the position of Boss on R.ENCORDER and PWB silk
JS3001
2. FFC WIRE and DRUM FPC WIRE
should be insert as follows.
1. Insert direction of FFC WIRE as follows.
CN
electrode side
90
OK
right side
CN CN
supporting side
NG
back side
NOTE
CN3102
NOTE) FFC WIRE SHOULD BE POSITIONED
BELLOW CASSETTE DOOR.
(FOR AVOID FFC WIRE
DISTURB CASSETTE IN AND OUT.)
Insert the bushing of POWER CORD so as not to twist the cord.

1-12 (No.YD052)
3.2 Loading mechanism assembly
3.2.1 Removing the tray (See Figure 3-2a, Figure 3-2b, Figure 3-2c, Figure 3-2d, Figure 3-2e, Figure 3-2f)
(1) Push aof the slide cam on the hole in the right side of the
loading base by using a driver until it stops. (See Figure 3-
2a.)
(2) The tray comes out. Pull the tray in a front direction until it
stops.
(3) Remove the two screws Aattaching the slide bracket. (See
Figure 3-2b.)
(4) Tilt the tray in a direction of the arrow around the point in
the left rear part of the tray. (See Figure 3-2c.)
(5) The rail of the tray is removed from bof the loading base.
Then, remove the tray upward. (See Figure 3-2d.)
Attaching the tray:
Engage cof the loading base to the projection of the tray while
tilting the tray to the left. Turn the tray in a direction of the ar-
row, and attach the slide bracket. (See Figure 3-2e.)
Note:
Prior to the procedure above, move the slide cam in a direction
of the arrow so that dof the slide cam can be inserted in eof
the tray. (See Figure 3-2f.)
Fig.3-2a
Fig.3-2b
Fig.3-2c
Fig.3-2d
Fig.3-2e
Fig.3-2f
Tray
Push
Loading base
Slide cam part a
Tray
AA
Slide bracket
Tray
The point in the left rear part
Loading base part bRail of the tray
Projection of the tray
Projection of the tray
Loading base part c
Slide cam
Part d
Part e

(No.YD052)1-13
3.2.2 Removing the traverse mechanism assembly (See Figure 3-2g)
Reverse the loading mechanism assembly. Remove the four
screws Battaching the traverse mechanism assembly. Remove
the traverse mechanism assembly upward.
Fig.3-2g
3.2.3 Removing the elevator (See Figure 3-2h and Figure 3-2j)
• Prior to the following procedure, remove the traverse mecha-
nism assembly.
(1) Remove the two arms of the elevator from the two parts f
by moving the arms in a direction of the arrow.
(2) Pull out the elevator in a rear direction.
Attaching the elevator:
Engage the two holes gto the two shafts on the front part of
the elevator. And then, attach the elevator.
Fig.3-2h
Fig.3-2j
Loading mechanism assembly
B
B
B
B
Traverse mechanism assembly
Part fPart
f
Elevator
Slide cam g
g
Shaft
Shaft
Elevator

1-14 (No.YD052)
3.2.4 Removing the loading motor (See Figure 3-2k and Figure 3-2l)
• Prior to the following procedure, remove the tray, the traverse
mechanism assembly, and the elevator.
(1) Remove the belt from the pulley.
(2) Remove two screws Cattaching the loading motor.
(3) Remove two solders hon the switch board.
Fig.3-2k
Fig.3-2l
3.3 Traverse mechanism assembly
3.3.1 Removing the pickup (See Figure 3-3a, Figure 3-3b)
• Prior to the following procedure, remove the traverse mecha-
nism assembly.
(1) Remove one screw Dattaching the plate.
(2) Remove the plate and the leaf spring.
(3) Lift iof the shaft 1, and pull out the shaft 1from j.
(4) Remove kof the pickup from the shaft 2.
Attaching the pickup:
(1) Engage kof the pickup to the shaft 2.
(2) Insert the shaft 1in j, and attach the shaft 1 to i.
(3) Attach the leaf spring, and then attach the plate. Fix the
leaf spring and the plate by using the screw D.
Fig.3-3a
Fig.3-3b
Loading base
Slide cam
Belt
C
C
Pulley Pulley
Loading motor
Switch board Part h
D
Plate
Leaf spring
Part i
Shaft 1
Shaft 2 Part k
Part j

(No.YD052)1-15
SECTION 4
ADJUSTMENT
4.1 Before adjustment
4.1.1 Precaution
•The adjustments of this unit include the mechanism com-
patibility and electrical adjustments. During the perfor-
mance of this work, be sure to observe the precautions for
each type of adjustment.
•If there is a reference to a signal input method in the signal
column of the adjustment chart, "Ext. S-input" means the
Y/C separated video signal and "Ext. input" means the
composite video signal input.
•Unless otherwise specified, all measuring points and
adjustment parts are located on the Main board.
4.1.2 Required test equipments
• Color (colour) television or monitor
• Oscilloscope: wide-band, dual-trace, triggered delayed sweep
• Signal generator: RF / IF sweep / marker
• Signal generator: stairstep, color (colour) bar [NTSC]
• Recording tape
• Digit-key remote controller(provided)
4.1.3 Required adjustment tools
z: Used --- : Not used
4.1.4 Color (colour) bar signal,Color (colour) bar pattern
4.1.5 Switch settings
When adjusting this unit, set the VCR mode and switches
as described below.
• When using the Jig RCU, it is required to set the VCR to the
Jig RCU mode (the mode in which codes from the Jig RCU can
be received). (See "section 2 SPECIFIC SERVICE INSTRUC-
TIONS".)
Fig.4-1 Jig RCU [PTU94023B]
• Set the switches as shown below unless otherwise specified
on the relevant adjustment chart. The switches that are not list-
ed below can be set as desired.
If the VCR is not equipped with the functions detailed below,
setup is not required.
4.1.6 Manual tracking mode (Auto tracking ON/OFF) set-
ting
(1) In order to set to the manual tracking mode during tape
playback, press the "TRACKING + and -" button at the
same time on the remote control unit.
• Each press of the button switches the auto tracking ON
or OFF.
• When the manual tracking mode is set, the tracking is
placed at the center position.
(2) Press "TRACKING +/-" to adjust the tracking manually.
Mechanism
compatibility
adjustment
Electrical
adjustment
Roller driver z---
Jig RCU --- z
Back tension cassette gauge z---
Alignment tape(MHP) z---
Alignment tape(MHP-L) zz
Roller driver
PTU94002
Back tension cassette gauge
PUJ48076-2
Jig RCU
PTU94023B
Alignment tape
(SP, stairstep, NTSC)
MHP
Alignment tape
(EP, stairstep, NTSC)
MHP-L
DVD test disc
VT-501
CD-DA test disc
CTS-1000
AUTO PICTURE/VIDEO CALIBRATION/
B.E.S.T./D.S.P.C.
OFF
PICTURE CONTROL/SMART PICTURE NORMAL/NATURAL
VIDEO STABILIZER OFF
TBC ON
Digital 3R ON
VIDEO NAVIGATION/TAPE MANAGER OFF
BLUE BACK OFF
White(75%)
100 IRE
40 IRE
Horizontal sync
QI
1V
White(100%)
Yellow Cyan
Green
Magenta
Red
Blue
Burst
40 IRE
White
Yellow
Cyan
Green
Magenta
Red
Blue
Q I Black
White
100%
(75%)
Color(colour) bar signal [NTSC] Color(colour) bar pattern [NTSC]
INITIAL MODE
DATA CODE
CUSTOM CODE
43: A CODE
[Data transmitting method]
Depress the " "( 3 ) button
after the data code is set.
Jig RCU

1-16 (No.YD052)
4.2 Mechanism compatibility adjustment (VHS SECTION)
Notes:
•Although compatibility adjustment is very important, it
is not necessary to perform this as part of the normal
servicing work. It will be required when you have re-
placed the A/C head, drum assembly or any part of the
tape transport system.
•To prevent damaging the alignment tape in the compat-
ibility adjustment, prepare a cassette tape (for self-re-
cording/playback), perform a test on it by transporting it
and making sure that the tape is not bent by the tape
transport mechanisms such as in the guide rollers.(See
Fig.4-2b.)
4.2.1 Tension pole position
Notes:
•This adjustment must be performed every time the ten-
sion band is replaced.
(1) Play back the back tension cassette gauge (A).
(2) Check that the indicated value on the left side gauge is
within the specified value (G).
(3) If the indicated value is not within the specified value (G),
perform the adjustment in a following procedure.(See
Fig.4-2a.)
a) Remove the top frame, cassette holder and side
frames (L/R) all together. (Refer to the SERVICE
MANUAL No.86700 [MECHANISM ASSEMBLY].)
b) Rotate the loading motor gear to move the control
plate so that the triangular stamping to the left of the
“P”stamping is aligned with the stamping (a) on the
main deck. This positioning is mode (B1).
c) Adjust by turning the adjustment pin so that the tip of
the tension arm is aligned with the stamping (b) on
the main deck.
d) Rotate the reel disk (S) by about one turn clockwise
and make sure that the round hole of the adjustment
pin is located in the "OK" range. If it is outside this
range, restart the adjustment from the beginning.
After completion of the adjustment, rotate the loading gear
motor to return it to the mode (B2) position.
Fig.4-2a
4.2.2 FM waveform linearity
(1) Play back the alignment tape (A1).
(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 its
generally parallel and linear variation ensured. Perform the
following adjustments when required. (See Fig. 4-2c.)
(5) Reduce the V.PB FM waveform by the tracking operation.
If a drop in level is found on the left side, turn the guide roll-
er of the pole base assembly (supply side) with the roller
driver to make the V.PB FM waveform linear.
If a drop in level is on the right side, likewise turn the guide
roller of the pole base assembly (take-up side) with the
roller driver to make it linear. (See Fig. 4-2c.)
(6) Make sure that the V.PB FM waveform varies in parallel
and linearly with the tracking operation again. When re-
quired, perform fine-adjustment of the guide roller of the
pole base assembly (supply or take-up side).
(7) Unload the cassette tape once, play back the alignment
tape (A1) again and confirm the V.PB FM waveform.
(8) After adjustment, confirm that the tape wrinkling does not
occur at the roller upper or lower limits. (See Fig. 4-2b.)
[Perform adjustment step (9) only for the models equipped
with SP mode and EP (or LP) mode.]
[Perform adjustment step (9) only for the models
equipped with SP mode and EP (or LP) mode.]
(9) Repeat steps (1) to (8) by using the alignment tape (A2).
Fig.4-2b
Signal (A) • Back tension cassette gauge [PUJ48076-2]
Mode (B1)
(B2)
•PB
• Eject end
Adjustment part (F) • Adjust pin [Mechansim assembly]
Specified value (G) •25 - 51 gf•cm (2.45 - 5 x 10-3 Nm)
OK
NG
ADJUST PIN
TENSION ARM
Stamping(b)
Stamping(a)
CONTROL PLATE
Signal (A1)
(A2)
• Alignment tape(SP, stairstep, NTSC) [MHP]
• Alignment tape(EP,stairstep,NTSC) [MHP-L]
Mode (B) • PB
Equipment (C) • Oscilloscope
Measuring point (D) • TP106 (PB. FM)
External trigger (E) • TP111 (D.FF)
Adjustment part (F) • Guide roller [Mechanism assembly]
Specified value (G) • Flat V.PB FM waveform
Adjustment tool (H) • Roller driver [PTU94002]
(a)GUIDE ROLLER
(b)GUIDE POLE
Improper Proper

(No.YD052)1-17
Fig.4-2c
4.2.3 Height and tilt of the A/C head
Note:
•Set a temporary level of the height of the A/C head in ad-
vance to make the adjustment easier after the A/C head
has been replaced. (Refer to the SERVICE MANUAL
No.86700 [MECHANISM ASSEMBLY].)
(1) Play back the alignment tape (A).
(2) Apply the external trigger signal to D.FF (E), to observe the
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 wave-
form 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.
Fig.4-2d
4.2.4 A/C head phase (X-value)
(1) Play back the alignment tape (A1).
(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) Loosen the screws (4) and (5), then set the Roller driver to
the innermost projected part of the A/C head. (See Fig. 4-
2e.)
(5) Rotate the roller driver so that the A/C head comes closest
to the capstan. From there, move the A/C head back grad-
ually toward the drum until the point where the FM wave-
form is maximized for the second time, and then
tighten the screws (4) and (5) temporarily.
(6) Play an alignment tape (A2) and set to the manual-tracking
mode.
(7) Fine-adjust A/C head base position to maximize the FM
waveform, and then tighten the screws (4) and (5) firmly.
(8) Play alignment tapes (A1) and (A2) and confirm that the FM
waveforms are maximized when the tracking is at the cen-
ter position.
Fig.4-2e
Fig.4-2f
Signal (A) • Alignment tape(SP, stairstep, NTSC) [MHP]
Mode (B) • PB
Equipment (C) • Oscilloscope
Measuring point (D1)
(D2)
• TP106 (PB. FM)
• TP4001 (CTL. P)
External trigger (E) • TP111 (D.FF)
Adjustment part (F) • A/C head [Mechanism assembly]
Specified value (G) • Maximum waveform
Improper waveform variation
A
B
CD
Up Down
Guide roller
(supply side)
Roller driver
Proper waveform variation
Head base
A/C head
AUDIO OUT
CTL.P
(1)
(2)
(3)
Signal (A1)
(A2)
• Alignment tape(SP, stairstep, NTSC) [MHP]
• Alignment tape(EP,stairstep,NTSC) [MHP-L]
Mode (B) • PB
Equipment (C) • Oscilloscope
Measuring point (D) • TP106 (PB. FM)
External trigger (E) • TP111 (D.FF)
Adjustment part (F) • A/C head base [Mechanism assembly]
Specified value (G) • Flat V.PB FM waveform
Adjustment tool (H) • Roller driver [PTU94002]
Head base
Roller driver
To the capstan
To the drum
Toward the capstan
Toward the drum
Screw (5)
Screw (4)
A/C head
Alignment tape
[SP, stairstep]
played with the
SP head
Alignment tape
[EP(LP), stairstep]
played with the
EP(LP) head
Drum side Control head position Capstan side
X-value adjustment point
Maximum
Waveform output

1-18 (No.YD052)
4.3 Electrical adjustment (VHS SECTION)
Note:
The following adjustment procedures are not only necessary
after replacement of consumable mechanical parts or board
assemblies, but are also provided as references to be referred
to when servicing the electrical circuitry.
In case of trouble with the electrical circuitry, always begin a
service by identifying the defective points by using the measur-
ing instruments as described in the following electrical adjust-
ment procedures. After this, proceed to the repair,
replacement and/or adjustment. If the required measuring in-
struments are not available in the field, do not change the ad-
justment parts (variable resistor, etc.) carelessly.
4.3.1 Servo circuit
4.3.1.1 Switching point
(1) Play back the signal (A1) of the alignment tape (A2).
(2) Apply the external trigger signal to D.FF (E) to observe the
VIDEO OUT waveform and V.PB FM waveform at the
measuring points (D1) and (D2).
(3) Set the VCR to the manual tracking mode.
(4) Adjust tracking so that the V.PB FM waveform becomes
maximum.
(5) Set the VCR to the Auto adjust mode by transmitting the
code (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).
Fig.4-3a Switching point
4.3.1.2 Slow tracking preset
(1) Record the signal (A2) in the mode (B1), and play back
the recorded signal.
(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.
(5) Set the VCR to the Stop mode.
(6) Confirm that the noise bar is (G) on the TV monitor in the
slow mode.
(7) Repeat steps (3) to (6) in the REV slow (+1/6x) mode.
(8) Repeat steps (1) to (7) in the mode (B2).
Note:
•For FWD slow (+1/6x) playback, transmit the code "43-
08" from the Jig RCU to enter the slow playback mode,
and transmit the code "43-D0" for REV slow (-1/6x)
mode.
Signal (A1)
(A2)
• Stairstep signal
• Alignment tape(EP,stairstep,NTSC) [MHP-L]
Mode (B) • PB
Equipment (C) • Oscilloscope
Measuring point (D) • VIDEO OUT terminal (75 ohm terminated)
• TP106 (PB. FM)
External trigger (E) • TP111 (D.FF)
Adjustment part (F) • Jig RCU: Code “43-5A”
Specified value (G) • 6.5 ± 0.5H
Adjustment tool (H) • Jig RCU [PTU94023B]
V.sync
Trigger point
Switching point
V. rate
Signal (A1)
(A2)
• Ext. input
• Color (colour) bar signal [NTSC]
Mode (B1)
(B2)
• VHS SP
•VHSEP
Measuring point (D) • TV-Monitor
Adjustment part (F) • Jig RCU: Code “43-71”or “43-72”
Specified value (G) • minimum noise
Adjustment tool (H) • Jig RCU [PTU94023B]

(No.YD052)1-19
4.4 Electrical adjustment (DVD SECTION)
4.4.1 Test mode setting method
(1) Press POWER button to turn off the unit.
(2) Press the following remocon keys continuously within 2seconds " SET UP " →" 2 " →" 8 " →" ENTER ".
(3) The unit becomes JIG RCU mode.
(4) Press POWER button then press VCR/DVD repeatedly so that the DVD indicator lights up on the front display panel.
(5) Press the POWER button again to turn off the unit.
(6) Transmit the code " 43-FA " from the Jig RCU.
(7) The power supply of the unit turns on automatically then the FDP shows the region number.
(8) Each pressing of DISPLAY button of the remote controller in test mode as follows.
(9) To release test mode, press POWER key of the front panel.
4.4.2 Method of displayed version of firmware
(1) Set the unit to the test mode.
(2) The version number is displayed in the monitor screen.
FDP(Example)
Becames test mode
(Region number)
Optimize Front End paramete
r
CD Laser
DVD Laser
VCR
OPENING DISPLAY
**_Ver.****_HS/HR_XVC29/*******
Destination
Version of firmware
Model name
Others

1-20 (No.YD052)
4.4.3 Initialization method
Please initialize according to the following procedures in the following case:
• Just after you upgrade the firmware.
• After you confirm the symptoms that a customer points out. First Initialize, and then confirm whether the symptoms are improved or
not.
• After servicing, before returning the main body to a customer. (Initialized unit should be returned to a customer.)
(1) Set the unit to the test mode.
(2) Press PAUSE key of the remote controller or transmit the code "43-6F" from the Jig RCU.
(3) When initialization is completed, the PLAY (). mark is indicated in the FDP.
4.4.4 All-initialization method
Please perform all-initialization according to the following procedures in the following case:
• Just after you exchange the pick-up.
• Just after you exchange the spindle motor.
• Just after you exchange the traverse mechanism base.
NOTE:
Please perform all-initialization when you exchange the parts above and also when you remove the parts above.
(1) Set the unit to the test mode.
(2) Press the REVERSE SKIP/INDEX () key of the remote controller for more than 2 seconds.
(3) When initialization is completed, the PLAY (). mark is indicated in the FDP.
NOTE:
After all-initialization, be sure to perform optimization adjustment of Front End parameter.
4.4.5 Optimization adjustment of Front End parameter
Adjustment to optimize Front End parameter must be performed in each mechanism assembly of this model for high-speed start-
ing.Please perform optimization according to the following procedures just after all-initialization is completed and when FDP shows
anything except "0" (For example when FDP shows "1", "2", and "3") at test mode.
(1) Set the unit to the test mode.
(2) The FDP shows the region number first.
(3) Press the DISPLAY key of the remote controller and check that FDP shows the number.
(4) Press the DISPLAY key again to return the region number.
NOTE:
Status of this adjustment can be judged by the number displayed at test mode as follows:
NOTE:
As for a disc used for adjustment,
• Disc should be mounted. ("Mounting" means to display "READ" after the disc is inserted and then display the disc informa-
tion.) Disc need not be played.
• If you do not have test disc either VT-501 (DVD) or CTS-1000 (CD-DA), use a commercial disc (for DVD, dual-layer soft-
ware) after seeing and checking that the disc is neither curved nor foreseen that it may shake at the time of playback.If you
use a disc with bad features, starting time may be slow or disc may not be read.
DVD adjustment CD adjustment FDP at test mode
Adjusted Adjusted 0
Not adjusted Adjusted 1
Adjusted Not adjusted 2
Not adjusted Not adjusted 3