JVC HR-P55A, HR-P55A/S, HR-P56A Service Manual
SERVICE MANUAL
VIDEO CASSETTE PLAYER
HR-P55A, HR-P55A/S
HR-P56A
Regarding service information other than these sections, refer to the service manual No. 82915 (HR-J290EU).
Also, be sure to note important safety precautions provided in the service manual.
SPECIFICATIONS
GENERAL
Power : 110 V – 240 Vd, 50 Hz/60 Hz
Power consumption
Power on : Approx. 12 W
Standby mode : 3.0 W
Video Head system : Rotary two-head helical scan system
Tape format : Tape width 1/2"
Rewind time : Approx. 180 sec. with E-180 cassette
Dimensions (W x H x D) : 360 mm x 94.5 mm x 230 mm
Weight : 3.2 kg
Operating temperature : 5°C to 35°C
Operating humidity : Less than 80 %
(12.7 mm high density VHS tape)
VIDEO
Signal system : PAL/SECAM-type colour signal and
CCIR monochrome signal, 625 lines
50 fields
Recording Format : PAL/MESECAM/NTSC3.58/NTSC4.43
RF OUT : PAL/SECAM (G or K)
Input level : 1.0 Vp-p, 75Ω , unbalanced
Output level : 1.0 Vp-p, 75Ω , unbalanced
RF modulator : UHF channels 32 – 40 (Adjustable)
AUDIO
Input level : –6.0 dBm, more than 47 kΩ
Output level : –6.0 dBm, less than 1.5 kΩ
Audio track : Mono track
Audio frequency response
: 100 Hz to 10,000 Hz
(–6/+3 dBm)
ACCESSORIES
Provided accessories : RF cable,
Infrared remote control unit,
“R3” battery x 2
Specifications shown are for SP mode unless specified otherwise.
E. & O.E. Design and specifications subject to change without
notice.
This service manual is printed on 100% recycled paper.
COPYRIGHT © 2002 VICTOR COMPANY OF JAPAN, LTD
HR-P55A, HR-P55A/S, HR-P56A V15P1
No.82939
August 2002
TABLE OF CONTENTS
SECTION 1
SUMMARY
KEY TO ABBREVIATIONS . . . . . . . . . . . . . . . . 1-1
IMPORTANT SAFETY PRECAUTIONS
RF CHANNEL ADJUSTMENT . . . . . . . . . . . . . . .1-4
SPECIFICATIONS . . . . . . . . . . . . . . . . . . . . . . . 1-5
. . . . . . . . 1-2
SECTION 2
CABINET & MAIN CHASSIS
SERVICE METHOD . . . . . . . . . . . . . . . . . . . . . 2-1
(1) Disassembly Flow . . . . . . . . . . . . . . . . . . . . . . . 2-1
(2) Re-assembly Flow for service like Fig.2-1 . . . . . 2-1
EXPLODED VIEWS . . . . . . . . . . . . . . . . . . . . . . 2-2
1. Cabinet & Main Frame Section . . . . . . . . . . . . . 2-2
2. Packing & Accessory Section . . . . . . . . . . . . . . 2-3
BLOCK& CIRCUIT DIAGRAMS . . . . . . . . . . . .3-16
1. POWER BLOCK DIAGRAM . . . . . . . . . . . . . . .3-16
2. POWER(SMPS) CIRCUIT DIAGRAM . . . . . . . .3-18
3. MODULATOR/JACK CIRCUIT DIAGRAM . . . . .3-20
4. AUDIO BLOCK DIAGRAM
(MONO MODELONLY) . . . . . . . . . . . . . . . . . . .3-22
5. Y/C BLOCK DIAGRAM . . . . . . . . . . . . . . . . . . .3-23
6. A/V CIRCUIT DIAGRAM . . . . . . . . . . . . . . . . . .3-24
7. SYSTEM BLOCK DIAGRAM . . . . . . . . . . . . . . .3-26
8. SYSTEM CIRCUIT DIAGRAM . . . . . . . . . . . . . .3-28
• WAVEFORM & VOLTAGE SHEET . . . . . . . . .3-30
• VOLTAGE SHEET . . . . . . . . . . . . . . . . . . . . .3-32
PRINTED CIRCUIT BOARD DIAGRAMS . . . . .3-34
1. MAIN P.C.BOARD . . . . . . . . . . . . . . . . . . . . . . .3-34
SECTION 4
MECHANISM
SECTION 3
ELECTRICAL
ELECTRICAL ADJUSTMENT POINTS
ARRANGEMENT . . . . . . . . . . . . . . . . . . . . . . . . 3-1
ELECTRICAL ADJUSTMENT PROCEDURES . . 3-2
1. SERVO CIRCUIT . . . . . . . . . . . . . . . . . . . . . . . . 3-2
ELECTRICAL TROUBLESHOOTING GUIDE . . . 3-3
1. POWER(SMPS) CIRCUIT . . . . . . . . . . . . . . . . . 3-3
2. SERVO CIRCUIT . . . . . . . . . . . . . . . . . . . . . . . .3-6
3. Y/C CIRCUIT . . . . . . . . . . . . . . . . . . . . . . . . . . .3-8
4. AUDIO CIRCUIT . . . . . . . . . . . . . . . . . . . . . . . .3-12
5. SYSTEM & KEY CIRCUIT . . . . . . . . . . . . . . . . .3-14
Refer to the service manual No.82915 (HR-J290EU).
SECTION 5
REPLACEMENT PARTS LIST
5.1 EXPLODED VIEW. . . . . . . . . . . . . . . . . . . . . . . .5-1
5.2 REPLACEMENT PARTS LIST. . . . . . . . . . . . . . .5-4
SECTION1 SUMMARY
KEY TO ABBREVIATIONS
A AC :Alternating Current
B B :Base
C C :Capacitor, Chroma, Collector
D D :Drum, Digital, Diode, Drain
E E :Emitter
F F :Fuse
G GEN :Generator
H H :High, Horizontal
I IC :Integrated Circuit
L L :Low, Left, Coil
ACC :Automatic Color Control
ACSS :Automatic Channel Setting System
ADJ :Adjust
A/E :Audio Erase
AFC :Automatic Frequency Control
AFT :Automatic Fine Tuning
AGC :Automatic Gain Control
A.H.SW :Audio Head Switch
ALC :Automatic Level Control
AM :Amplitude Modulation
AMP :Amplifier
ANT :Antenna
APC :Automatic Phase Control
ASS’Y :Assembly
AUX :Auxiliary
BGP :Burst Gate Pulse
BPF :Bandpass Filter
BS :Brodcasting Satellite
BW or B/W :Black and White
CAN :Cancel
CAP :Capstan
CAP.BRK :Capstan Brake
CAP.RVS :Capstan Reverse
CATV :Cable Television
CBA :Circuit Board Assembly
CCD :Charge Coupled Device
C.CTL :Chro Control, Capstan Control
CFG :Capstan Frequency Generator
CHROMA :Chrominance
CNR :Chroma Noise Redution
COMB :Combination
COMP :Comparator
CONV :Converter
C.ROT SW :Color Rotary Switch
CS :Chip Selcet
C.SYNC :Composite Synchronization
CTL DIV :Control Divide
CUR :Current
CYL :Cylinder
D.ADJ :Drum Adjust
DC :Direct Current
D.CTL :Drum Control
DEMOD :Demodulator
DET :Detector
DEV :Deviation
DHP :Double High Pass
DIGITRON :Digital Display Tube
DL :Delay line
DOC :Drop Out Compensator
DUB :Dubbing
D.V SYNC :Dummy Vertical Synchronization
EE :Electric to Eletr ic
EMPH :Emphasis
ENA :Enable
ENV :Envelope
EP :Extended Play
EQ :Equalizer
EXP :Expander
FB :Feed Back
FBC :Feed Back Clamp
FE :Full Erase
FG :Frequency Generator
FL :Filter
FM :Frequency Modulation
F/R :Front/Rear
FS :Frequency Synthesizer
FSC :Subcarrier Frequency
F/V :Frequency Voltage
IF :Intermediate Frequency
INS :Insert
LD :LED
LD VTG CTL
LECHA :Letter Character
L.M :Level Meter
LP :Long Play
Comb Filter
Composite
Compensation
:Loading Voltage Control
M MAX :Maximum
N NR :Noise Reduction
O OSC :Oscillator
P PB :Playback
Q Q :Transistor
R R :Resistor, Right
S S :Serial
T T :Coil
U UHF :Ultra High Frequency
V V :Volt, Vertical
W W :Watt
X X-TAL :Crystal
Y Y/C :Luminance/Chrominance
Z ZD :Zener Diode
LPF :Low Pass Filter
MD :Modulator
MECHA.CTL
MIC :Microphone
MIN :Minimum
MIX :Mixer, Mixing
M.M. :Monostable, Multivibrator
MMV :Mono Multi Vibrator
MOD :Modulation, Modulator
MODEM :Modulator-Demodulator
MPX :Multiplex
OSD :On Screen Display
PCB :Printed Circuit Board
P.CTL :Power Control
PRE-AMP :Preamplifier
P.F :Power Failure
PG :Pulse Generator
PLL :Phase Locked Loop
PREM.DET :Premire Detect
P.P :Peak-to-Peak
PS :Phase Shift
PWM :Pulse Width Modulation
PWR CTL :Power Control
QH :Quasi Horizontal
QSR :Quick Setting Record
QTR :Quick Timer Record
QV :Quasi Vertical
RE(or RC) :Remocon, Receiver
REC :Recording
REC S ‘H’ :Record Start ‘Hight’
REF :Reference
REG :Regulated, Regulator
REMOCON :Remote Control(unit)
RF :Radio Frequency
R/P :Record/Playback
RTC :Reel Time Counter
S.ACCEL :Slow Accel
SAOP :Second Audio Program
SC :Scart, Simulcast
S.DET :Secam Detect
SH :Shift
SHARP :Sharpness
SIF :Sound Intermediate Frequency
SLD :Side Locking
S/N :Signal to Noise Ratio
SP :Standard Play
ST :Stereo
SUB :Subtract, Subcarrier
SW or S/W :Switch
SYNC :Synchronization
SYSCON :System Control
TP :Test Point
TR :Transistor
TRK :Tracking
TRANS :Transformer
TU :Tuner, Take-up
UNREG :Unregulated
VA :Always Voltage
VCO :Voltage Controlled Oscillator
VGC :Voltage Gain Control
VHF :Very High Frequency
V.H.SW :Video Head Switch
VISS :VHS Index Search
VPS :Video Program System
VR :Variable Resistor or Volume
V-SYNC :Vertical Synchronization
VTG :Voltage
VV :Voltage to Voltage
VXO :Voltage X-tal Oscillator
WHT :White
W/O :With out
YNR :Luminance Noise Reduction
:Mechanism Control
1-1
Important Safety Precautions
cut close to connector
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.
v
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 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.
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 order 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.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.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.
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 cathode 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.
Fig.4
(3) Align the lengths of the wires to be connected. Insert
the wires fully into the connector.
Metal sleeve
Connector
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.
1.25
2.0
5.5
Fig.6
(5) Check the four points noted in Fig.7.
Not easily pulled free
Wire insulation recessed
more than 4 mm
Fig.7
Crimping tool
Crimped at approx. center
of metal sleeve
Conductors extended
1
S40888-01
v
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.
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’) between soldered terminals, and between terminals and surrounding metallic parts. See table 1
below.
Chassis
Fig. 8
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 accessible 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.
AC inlet
Earth pin
Exposed accessible part
Grounding Specifications
Region
USA & Canada
Europe & Australia
Externally
exposed
accessible part
Grounding Impedance (Z)
d
d'
≤
Z 0.1 ohm
≤
Z 0.5 ohm
Power cord,
primary wire
Z
V
Fig. 9
ab
c
Milli ohm meter
Fig. 10
AC Line Voltage
100 V
100 to 240 V
110 to 130 V
110 to 130 V
200 to 240 V
100 V
110 to 130 V
110 to 130 V
220 to 240 V
Note: These tables are unofficial and for reference only. Be sure to confirm the precise values for your particular country and locality.
Region
Japan
USA & Canada
Europe & Australia R 10 MΩ/500 V DC
Region Load Z
Japan
USA & Canada
Europe & Australia
Table 2 Leakage current specifications for each region
Insulation Resistance (R)
≤
R 1 MΩ/500 V DC
≥≥
1 MΩ R 12 MΩ/500 V DC
≤
Table 1 Specifications for each region
1 kΩ
0.15 µF
1.5 kΩ
2 kΩ
50 kΩ
Dielectric Strength
AC 1 kV 1 minute
AC 1.5 kV 1 miute
AC 1 kV 1 minute
AC 3 kV 1 minute
AC 1.5 kV 1 minute
i 1 mA rms Exposed accessible parts
i 0.5 mA rms
i 0.7 mA peak
i 2 mA dc
i 0.7 mA peak
i 2 mA dc
2
≤
≤
≤
≤
≤
≤
(Class 2)
(Class 1)
Clearance Distance (d), (d')
≤
d, d' 3 mm
≤
d, d' 4 mm
≤
d, d' 3.2 mm
≤
d 4 mm
≤
d' 8 mm (Power cord)
≤
d' 6 mm (Primary wire)
a, b, cLeakage Current (i)AC Line Voltage
Exposed accessible parts
Antenna earth terminals
Other terminals
S40888-01
RF CHANNEL ADJUSTMENT
TOP
CASE
REAR
MAINFRAM
MODULATOR
SET WITHIN
A:CH ADJ
B:SYSTEM G/K ADJ
1. RF setting initial condition for your VCP Models
RF Channel(32~40CH)
35CH for Australia
36CH for CIS
36CH for Southeast Asia
39CH for Singapor,Malaysia
G/K Switch(BG/DK)
G for Australia
K for CIS
G for Southeast Asia
G for Singapor,Malaysia
2. RF Channel adjusting method for your TV sets
1. Open the Top Case of the VCP set
2. Connect VCP “RF OUT” and TV “ANT IN” with RF Cable.
3. Select the TV Channel to the Channel you wish to adjust from VCP set.
4. Playback a recorded Video Tape and adjust the “CH ADJ” until normal
picture is displayed on the TV screen.(See Fig. Above “A”(CH ADJ)
5. Set the VCP G/K Switch to G or K according to your TV system.
(See Fig. above “B”(G/K ADJ)
1-4
General
Video
Audio
SPECIFICATIONS
Power.................................... AC110~240V, 50/60Hz
Power consumption .............. Approx. 10 Watts
Tape format........................... Tape Width 12.7 mm (0.5 inch)
Dimensions (W x H x D)....... 360 x 94 x 230 mm
Weight ................................... Approx. 3.0 Kg.
Operating temperature .......... 5 ~ 35°C
Operating humidity ................ Less than 80%
Television system.................. CCIR standard (625 lines, 50 fields), PAL colour signal
Recording format .................. PAL/NTSC3.58/NTSC4.43
RF OUT................................. K/G
Input level.............................. 1.0Vp-p, 75 Ohm, unbalanced
Output level .......................... 1.0Vp-p, 75 Ohm, unbalanced
RF modulator........................ UHF channels 32~40 (adjustable)
Input level.............................. -6 dBm, more than 47 kOhms
Output level ........................... -6 dBm, less than 1.5 kOhms
Audio track ........................... Mono track
Audio frequency response.... 100 Hz ~ 10kHz(-6/+3 dBm)
• Design and specifications are subject to change without notice.
1-5
SECTION2 CABINET & MAIN FRAME
SERVICE METHOD
(1) Disassembly Flow
Bottom Cover
Housing & Deck
Top Case
Front Panel
Assembly
Main C.B.A
LED C.B.A
(2)Re-assembly Flow for service like Fig. 2-1
LED C.B.A
Main C.B.A
Housing & Deck
Assembly
(3)To check and replace Electrical par ts
1 Disassemble the unit according to
No.1) Disassembly Flow.
2 Re-assemble the unit according to
No.2) Re-assembly Flow.
3 Place the unit like Fig. 2-1
4 Check and replace Electrical parts.
NOTE :
1 Insert Video Cassette Tape inversely like Fig. 2-1
to check and replace defective parts.
2 In disassembling and reassembling, be careful not
to damaged CST switch.
(Positioned Upside Down)
Housing & Deck Assembly
Main C.B.A
Cassette Tape
(Upside Down)
Fig.2-1
2-1
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