JVC HR-S6950EU, HR-S6955MS, HR-S7950EU, HR-S7955EK, HR-S7955MS Service Manual
SERVICE MANUAL
VIDEO CASSETTE RECORDER
HR-S6950EU, HR-S6955MS,
HR-S7950EU, HR-S7955EK, HR-S7955MS
SPECIFICATIONS
GENERAL
Power requirement : AC 220 V – 240 Vd, 50 Hz/60 Hz
Power consumption
Power on : 18 W
Power off : 3.6 W
Temperature
Operating : 5°C to 40°C
Storage : –20°C to 60°C
Operating position : Horizontal only
Dimensions (WxHxD)
: 400 mm x 94 mm x 270 mm
Weight : 3.4 kg
Format : S-VHS/VHS PAL standard
Maximum recording time
(SP) : 240 min. with E-240 video cassette
(LP) : 480 min. with E-240 video cassette
(EP) : 720 min. with E-240 video cassette
VIDEO/AUDIO
Signal system : PAL-type colour signal and CCIR
Recording system : DA4 (Double Azimuth) head helical
Signal-to-noise ratio: 45 dB
Horizontal resolution
(SP/LP) : 250 lines (VHS)
(EP) : 220 lines (VHS)
Frequency range : 70 Hz to 10,000 Hz (Normal audio)
(The specifications shown pertain specifically to the model HR-S7950EU.)
monochrome signal, 625 lines
50 fields
scan system
400 lines (S-VHS)
350 lines (S-VHS)
20 Hz to 20,000 Hz (Hi-Fi audio)
Input/Output : 21-pin SCART connectors:
TUNER/TIMER
TV channel storage capacity
Tuning system : Frequency synthesized tuner
Channel coverage : VHF 47 MHz – 89 MHz/
Aerial output : UHF channels 22 – 69 (Adjustable)
Memory backup time
ACCESSORIES
Provided accessories
Specifications shown are for SP mode unless otherwise
specified.
E.& O.E. Design and specifications subject to change without
notice.
IN/OUT x 1, IN/DECODER x 1
RCA connectors:
VIDEO IN x 1, AUDIO IN x 1,
AUDIO OUT x 1
S-Video connector:
IN x 1, OUT x 1
: 99 positions (+AUX position)
104 MHz – 300 MHz/
302 MHz – 470 MHz
UHF 470 MHz – 862 MHz
: Approx. 10 min.
: RF cable,
Infrared remote control unit,
“R6” battery x 2
This service manual is printed on 100% recycled paper.
COPYRIGHT © 2002 VICTOR COMPANY OF JAPAN, LTD
V15S1/S2/S15
No.82923
June 2002
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
1.3.4 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
1.8 Sevicing items related to video navigation ..................................... 1-10
2. MECHANISM
2.1. Before disassembling/assembling .................................................. 2-1
2.1.1 Notes.......................................................................................... 2-1
2.1.2 Mechanism operation check ...................................................... 2-1
2.1.3 Setting the mechanism assembling mode ................................. 2-1
2.1.4 Layout of the main mechanism parts ......................................... 2-2
2.1.5 Disassembling procedure table.................................................. 2-3
2.2. Replacement of the main mechanism parts.................................... 2-4
2.2.1 Cassette holder .......................................................................... 2-4
2.2.2 A/C head .................................................................................... 2-5
2.2.3 Guide arm, pinch roller arm ....................................................... 2-6
2.2.4 Idler arm, idler gear 1/2 .............................................................. 2-6
2.2.5
Main brake(T), brake lever , tension arm,reel disk(S/T), Rec safety lever
Press lever, control cam, capstan brake assembly ,loading motor assembly
2.2.6
2.2.7 Capstan motor, load gear, control plate ..................................... 2-8
2.2.8 Clutch unit assembly, direct gear............................................... 2-9
2.3. 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 .......................
EVR sdjustment ...................................................................................
3.1.7
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
........................ 1-5
....................... 1-10
.................... 2-6
.................... 2-7
3-1
3-2
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
3.3.3 Audio circuit................................................................................ 3-5
3.3.3.1 Audio REC FM ...................................................................... 3-5
3.3.4 Syscon circuit(EU/EK MODEL) .................................................. 3-6
3.3.4.1 Timer clock............................................................................ 3-6
3.3.5 PAL/SECAM converter circuit(MS MODEL)............................... 3-6
3.3.5.1 Colour difference level .......................................................... 3-6
3.3.5.2 SECAM burst position ........................................................... 3-6
4. CHARTS AND DIAGRAMS
4.1 BOARD INTERCONNECTIONS ...................................................... 4-3
4.2 MAIN(VIDEO/N.AUDIO) SCHEMATIC DIAGRAM........................... 4-5
4.3 MAIN(ON SCREEN) SCHEMATIC DIAGRAM ................................ 4-7
4.4
MAIN(SECAM) SCHEMATIC DIAGRAM [HR-S6950MS/S7955MS].................
4.5 MAIN(FMA) SCHEMATIC DIAGRAM .............................................. 4-9
4.6 MAIN(SYSCON) SCHEMATIC DIAGRAM..................................... 4-11
4.7 MAIN(SW.REG) SCHEMATIC DIAGRAM ..................................... 4-13
4.8 MAIN(TUNER) SCHEMATIC DIAGRAM ....................................... 4-15
4.9
MAIN(FRONT) ,MINI FRONT, S-JACK AND ADV.JOG SCHEMA TIC DIAGRAM ...
MAIN(MAIN TERMINAL) SCHEMATIC DIAGRAM
4.10
2D DIGITAL SCHEMATIC DIAGRAM [HR-S6950EU/S6955MS/S7955MS]...................
4.11
3D/TBC (2M) SCHEMATIC DIAGRAM [HR-S7950EU/S7955EK]
4.12
TERMINAL(S-SUB) SCHEMATIC DIAGRAM
4.13
4.14
TERMINAL(I/O) SCHEMATIC DIAGRAM.........................................
DEMODULATOR SCHEMATIC DIAGRAM .....................................
4.15
S-P CONVERTER SCHEMATIC DIAGRAM [HR-S6955MS/S7955MS] ...............
4.16
4.17 MAIN CIRCUIT BOARD............................................................... 4-33
4.18 2D DIGITAL AND 3D DIGITAL/2M CIRCUIT BOARDS ............... 4-36
4.19 DEMODULATOR CIRCUIT BOARD ............................................ 4-37
4.20
S-P CONVERTER CIRCUIT BOARD[HR-S6955MS/S7955MS] ............
TERMINAL CIRCUIT BOARD.................................................................
4.21
WAVEFORMS .........................................................................................
4.22
VOLTAGE CHARTS ................................................................................
4.23
REMOTE CONTROLLER
4.24
4.25
FDP GRID ASSIGNMENT AND ANODE CONNECTION
CPU PIN FUNCTION
4.26
SYSTEM CONTROL BLOCK DIAGRAM
4.27
VIDEO BLOCK DIAGRAM
4.28
4.29
AUDIO BLOCK DIAGRAM
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
2D D BOARD ASSEMBLY<05>[HR-S6950EU/S6955MS/S7955MS]
3D D/2M BOARD ASSEMBLY<05>[HR-S7950EU/S7955EK]
TERMINAL BOARD ASSEMBLY<06> ............................................... 5-16
A/C HEAD BOARD ASSEMBLY<12> ............................................................
DEMOD BOARD ASSEMBLY<14>.................................................... 5-18
MINI FRONT BOARD ASSEMBLY<28>
S.JACK BOARD ASSEMBLY<36> .................................................... 5-18
ADV.JOG BOARD ASSEMBLY<38> .................................................. 5-18
LOADING MOTOR BOARD ASSEMBLY<55>................................... 5-19
S-P CONVERTER BOARD ASSEMBLY<87>[HR-S6955MS/S7955MS]
SCHEMATIC DIAGRAM ........................ 4-43
...................................................................... 4-44
............................................................... 4-47
............................................................... 4-51
........................................... 4-45
[HR-S7955MS]
......................... 4-19
.......................... 4-23
................................. 4-25
..................... 4-43
.......................
...................... 5-18
4-8
4-17
4-21
4-27
4-29
4-31
4-37
4-38
4-39
4-41
.......... 5-14
5-15
5-18
...... 5-19
The following table lists the differing points between models HR-S6950EU, HR-S6955MS, HR-S7950EU, HR-S7955EK and
HR-S7955MS.
ITEM
MODEL
HR-S6950EU
HR-S7950EUHR-S6955MS HR-S7955MSHR-S7955EK
POWER PLUG CEE 3PIN CEE
DIGITAL SLOW NOT USED USED NOT USED
RETAKE NOT USED USED
ZERO FRAME EDIT NOT USED USED
INSERT / AUDIO DUBBING
NOT USED USED
MESECAM USED(MANUAL) USED(PB ONLY) USED(MANUAL) NOT USED USED(PB ONLY)
SECAM NOT USED USED NOT USED USED
TBC NOT USED USED NOT USED
REAR S OUT(4-pin) NOT USED USED
REMOTE PAUSE TERMINAL
BROADCASTING STANDARD
NOT USED USED
B/G, D/K L, B/G B/G, D/K I L, B/G
RF OUT USED NOT USED USED NOT USED
VPS USED NOT USED USED NOT USED
OSD LANGUAGE 13 LANGUAGES FRENCH 13 LANGUAGES ENGLISH FRENCH
x1.5 PLAYBACK with AUDIO
NOT USED USED NOT USED
Notes: Mark is same as left.
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
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.
symbol and shaded ( ) parts are
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
d'
d
Chassis
Power cord,
primary wire
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.
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.
Externally
exposed
accessible part
Z
V
Fig. 9
ab
c
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
AC Line Voltage
100 V
100 to 240 V
110 to 130 V
110 to 130 V
200 to 240 V
Exposed accessible part
Milli ohm meter
Fig. 10
Region
Japan
USA & Canada
Europe & Australia R 10 MΩ/500 V DC
Region Load Z
Insulation Resistance (R)
≤
R 1 MΩ/500 V DC
≥≥
1 MΩ R 12 MΩ/500 V DC
≤
Table 1 Specifications for each region
Grounding Specifications
Region
USA & Canada
Europe & Australia
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
(Class 2)
(Class 1)
Grounding Impedance (Z)
≤
Z 0.1 ohm
≤
Z 0.5 ohm
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
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.
Japan
USA & Canada
Europe & Australia
Table 2 Leakage current specifications for each region
1 kΩ
0.15 µF
1.5 kΩ
2 kΩ
50 kΩ
2
≤
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
Exposed accessible parts
Antenna earth terminals
Other terminals
S40888-01
SECTION 1
Screw(a)
Screw(a)
Top frame
Cassette tape
Cassette holder
Side frame(R)
Side frame(L)
Hook(a)
Hook(b)
DISASSEMBLY
1.1 Manually removing the cassette tape
If you cannot remove the cassette tape which is loaded because 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. 1-1a
Tension arm assembly
Pole base assembly
Pinch roller arm assembly
(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
cassette 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).
Spring(a)
Fig. 1-1b
Fig. 1-1c
(6) Take up the slack of the tape into the cassette. This com-
pletes removal of the cassette tape.
Direction of unloading
1-1
1.2 Removing the major parts
1.2.1 How to read the procedure table
This table shows the steps for disassembly of the externally
furnished parts and board assemblies. Reverse these steps
when re-assembling them.
<Example>
Step/
Loc No.
Part Name
[1] Top cover, 1-3a
Bracket 2(S1c)
(1) (2) (3) (4) (5)
Fig.
No.
Point Note
4(S1a),(S1b),3(L1a), <Note 1a>
2(SD1a),(P1a),(W1a),
CN1(WR1a),
----------------------------------------
(1) Order of steps in Procedure
When reassembling, perform the step(s) in the reverse order.
These numbers are also used as the identification (location) 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 as-
•
signed nos. in priority order and do not correspond to
those on the spare parts list.
(5) Adjustment information for installation
1.2.2
Disassembly procedure
Step/
Loc No.
Part Name
[1] Top cover
[2] Front panel
assembly CN7005(WR2a) <
--------------------------------------------------------------------------
[HR-S7955MS] CN7001(WR2c)
Mini front board assembly
--------------------------------------------------------------------------
(
ADV. Jog board assembly)2(S2b), Knob assembly
--------------------------------------------------------------------------
(Front S jack board assembly)
[3] Mechanism
assembly (S3a), (S3b) <
(Drum assembly) CN1(WR3b),
(Inertia plate) 4(L3b)
(Roller arm assembly) (S3g), (W3a), (P3a),
[4]
[HR-S6955MS, S7955MS]
S/P Converter board assembly
[5]
Main board assembly
[6] Bottom cover
Fig.
No.
1-2-2d
1-2-2d
--------------------------
Point Note
4(S1a), (S1b)
[HR-S7955MS] <
[HR-S6950EU, S6950MS
HR-S7950EU, S7955EK]
CN7001(WR2a),
--------------------------
CN916(WR2b),
2(S2a), 4(L2a), 3(L2b)
(L2c), (L2d),
PC Support
2(S2c)
1-2-2d
CN2001(WR3a), <
--------------------------
(S3c), (S3d), (S3e)
--------------------------
--------------------------
(L3c)
1-2-2d
CN511(WR4a)
2(S4a), (L4a)
1-2-2d
(S5a), 3(S5b), (L5a)
1-2-2d
3(L6a), 5(L6b), 2(L6c)
Note 2a
Note 2b
Note 2a
Note 3a
<
Note 3b
<
Note 3c
>
>
>
>
>
>
<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
prior 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.
Door
opener
Switch
knob
Switch
lever
<Note 3a>
Side
frame(R)
Fig. 1-2-2a
• When reattaching the Mechanism assembly, secure the screws
(S3a to S3b) in the order of a, b.
<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 “Mechanism assembling mode”. (See “section 2 mechanism”.)
• When reattaching the Mechanism assembly to the Main board
assembly , take care not to damage the sensors and switch on
the Main board assembly.
Mechanism
assembly
<Note 3c>
(S3d)
(S3c)
(S3e)
Drum
assembly
<Note 3c>
(S3d)
<NOTE>
Attach the Drum assembly appropriately,
since the installation state of the Drum assembly
influences the FM WAVEFORM LINEARITY
greatly.
Fig. 1-2-2b
(S3c)
(S3e)
HOOK
• When reattaching the Drum assembly, secure the screws (S3c
to S3e) in the order of c, d, e.
• When handling the drum assembly alone, hold it by the motor
or shaft. Be careful not to touch other parts, especially the video
heads. Also take care not to damage the connectors.
Shaft
Motor
Video heads
Fig. 1-2-2c
1-2
NOTE) INERTIA PLATE should be attached so as to ser small
Roller arm assembly
(S4a)
k
h
ONLY USED FOR
HR-S6955MS,
HR-S7955MS
[2] Front panel
assembly
<Note 2b>
Cassette door
<Note 2b>
Knob assembly
The excessive length portion
of wire should be reat as figure.
diameter of central round hole above.
Inertia plate
(L3b)
(S3g)
(W3a)
(P3a)
<Note 3e>
NOTE) When attaching ROLLER ARM ASS'Y,
attach the hook(L3c) before the spring(P3a).
NOTE) After attached ROLLER ARM ASS'Y,
tighten screw(S3g) with slit washer(W3a).
(L3c)
g
(S4a)
(S5a)
h
[4] S/P conveter board
assembly
k
a
(L4a)
f
h
a
h
f
"Z"
ONLY USED
FOR HR-S7955MS
(L2a)
(L2b)
(L2c)
PC Support
(L2d)
[2]Mini front board
(L2a)
(L2b)
[6] Bottom cover
(L6b)
right side
CN1601
A
(S2a)
(S5b)
b
c'
(L6c)
assembly
f
<Note 2a>
<Note 3a>
0
0
3
Q
(L5a)
(WR3b)
(S3a)
e
3
b
(L6a)
f
DRUM
Drum assembly
<Note 3c>
(S3c)
c
c'
1
0
0
3
D
1
0
0
3
S
Q
J
Switch knob
<Note 2b>
d'
c'
b
(L6a)
back side
d
(S5b)
2
0
0
3
b
f
CN916
g
a
<Note 3c>
(S3d)
<Note 3c>
c
d
d'
c'
b
e
Make a crease
A/C HEAD
(WR3a)
<Note 2a>
(S3b)
<Note 3a>
[3] Mechanism assembly
<Note 3b>
d
(S2a)
(S3e)
C
N
5
0
0
1
e
[5]Main board
Insert the bushing of POWER CORD
so as not to twist the cord.
assembly
REAR SIDE
(S5b)
JS3001
b
For the prevention of the DRUM FPC damage.
When you attach the Mechanism assembly on Bottom chassis.
Attach the Mechanism assembly after the positioning boss "z" of the
Bottom chassis is matched to the positioning hole of the Mehcanism assembly.
NOTE) INSERT FFC WIRE TO THE CONNECTOR BEFORE
f
ATTACHING JOG/SW PWB TO F.PANEL.
NOTE)INSERT FFC WIRE TO THE CONNECTOR
BEFORE ATTACHING JOG/SW PWB TO F.PANEL.
Back side
CN7003
(WR2a)
<Note 2a>
ADV. Jog board
assembly
(L6b)
(L6a)
(S2b)
f
f
<Note 2a>
(WR4a)
back side
Make a crease
(WR3a)
<Note 2a>
CN511
CN2001
<Phase alignment>
Accord the position of V gap on R. Encoder and PWB silk " ".
Accord the position of Boss on R. Encoder and PWB silk " ".
NOTE) WHEN YOU FIX FRONT S Jack PWB WITH THE SCREW.
PUT JIG UNDER FRONT PANEL ASS'Y.
Front panel assembly back side
Switch lever
<Note 2b>
CN5001
(S1a)
[1] Top cover
(S1a)
(S1b)
Front S Jack board assembly
CN7108
(WR2b)
<Note 2a>
(S2c)
NOTE
1. Insert direction of FFC WIRE as follows.
Right side Back side
electrode side
2. FFC WIRE and DRUM FPC WIRE should
be insert as follows.
OK
90°
CN
3. Insert direction of POWER CORD.
U/U(C)/JPN
WHITE LINE
supporting side
NG
CN CN
Except U/U(C)/JPN
BLUE
(WR2b)
<Note 2a>
To Front S Jack board assembly
Fig. 1-2-2d
CN7001
To Adv. Jog board assembly
right side
(WR2a)
<Note 2a>
B
DETAIL "A"
About 5cm
Make a crease
NEUTRAL
Make a crease
P/S CONV PWB
NEUTRAL
CN5001
ONLY USED
FOR HR-S7955MS
DETAIL "B"
FRONT PANEL
CN7002
CN7005
(WR2a)
Push the FFC wire from the FRONT PANEL
to rear side.
CN7001
CN5001
(WR2c)
1-3
1.3 Emergency display function
This unit saves details of the last two emergencies as the EMG
history and allows the status of the VCR and the mechanism
of each emergency to be shown both on the display and as
OSD information.
When using the emergency function, it is required to set the
VCR to the Jig RCU mode (the mode in which codes from the
Jig RCU can be received).
Jig RCU
[Data transmitting method]
Depress the “ ” ( 3 ) button
after the data code is set.
CUSTOM CODE
43: A CODE
DATA CODE
INITIAL MODE
0: 00 : 00
E:**:**
*1: *2 : 34
*5: *6 : *7
*8: *9 : *10
Normal display (Counter or clock)
EMG content display (E:Latest:Previous) See 1.3.4.
[EMG code display mode]
EMG detail information <1> display See 1.3.5.
[Deck and other mode display mode]
EMG detail information <2> display See 1.3.6.
[Cassette display mode]
EMG detail information <3> display See 1.3.7.
[Deck mode history dispaly mode]
Fig. 1-3-1b EMG display of FDP display model
Fig. 1-3a Jig RCU [PTU94023B]
1.3.1 Displaying the EMG information
The EMG detail of information can be displayed by transmitting the code "59" from the Jig RCU.
Note:
The EMG detail information <1><2> show the information on
•
the latest EMG.
It becomes “ – – : – – : – –” when there is no latest EMG
record.
0: 00
E: **
1E: **
1: *1
2: *2
3: 34
4: *5
5: *6
6: *7
7: *8
8: *9
9: *10
Normal display
EMG content display (Latest) See 1.3.4.
EMG content display (Previous) See 1.3.4.
EMG detail information <1> See 1.3.5.
[Deck operation mode]
EMG detail information <1> See 1.3.5.
[Mechanism operation mode]
EMG detail information <1> See 1.3.5.
[Mechanism sensor information and Mechanism mode position]
EMG detail information <2> See 1.3.6.
[Type of the cassette tape in use <1>]
EMG detail information <2> See 1.3.6.
[Winding position of the cassette tape in use]
EMG detail information <2> See 1.3.6.
[Type of the cassette tape in use <2> (Winding area)]
EMG detail information <3> See 1.3.7.
[Previous deck operation mode]
EMG detail information <3> See 1.3.7.
[The deck operation mode of the one before the last]
EMG detail information <3> See 1.3.7.
[The deck operation mode of the one prior to one above]
Fig. 1-3-1a EMG display of 7segment LED display model
<Reference> EMG display of FDP display mode
(1) Transmit the code “59” from the Jig RCU.
The FDP shows the EMG content in the form of “E:**:**”.
<Example 1> E : 01 : 03
Previous EMG
Latest EMG
<Example 2> E : –– : ––
No EMG record
(2) Transmit the code “59” from the Jig RCU again.
The FDP shows the EMG detail information <1> in the form
of “ *1 : *2 : 34 ”.
*1 : Deck operation mode at the moment of EMG
*2 : Mechanism operation mode at the moment of EMG
3– : Mechanism sensor information at the moment of
EMG
–4 : Mechanism mode position at the moment of EMG
(3) Transmit the code “59” from the Jig RCU once again.
The FDP shows the EMG detail information <2> in the form
of “ *5 : *6 : *7 ”.
*5 : Type of the cassette tape in use <1> .
*6 : Winding position of the cassette tape in use
*7 : Type of the cassette tape in use <2> (Winding area)
(4) Transmit the code “59” from the Jig RCU once again.
The FDP shows the EMG detail information <3> in the form
of “*8 : *9 : *10”.
* 8 : Previous deck operation mode at the moment of
EMG
*9 : The deck operation mode of the one before the last
at the moment of EMG
* 10 : The deck operation mode of the one prior to one
above at the moment of EMG
(5) Transmit the code “59” from the Jig RCU once again to re-
set the display.
1.3.2 Clearing the EMG history
(1) Display the EMG history.
(2) Transmit the code “36” from the Jig RCU.
(3) Reset the EMG display.
1-4
1.3.3 Details of the OSD display in the EMG display mode
AA BB CC
DD EE FF
GGGG HHHH
I I JJJJ
KKKK LLLL MMMM
ROM No.
<Display>
** h
********
Encoder data
(See Mechanism mode sequence.)
Remote pause
End sensor
Start sensor
Cassette tab present = 1
Cassette tab broken = 0
*DD: Sensor information details
AA : Key code (JVC code)
BB : Deck operation mode (See EMG detail information <1>.)
CC :
Mechanism operation mode (See EMG detail information <1>.)
DD : Sensor information (See sensor information details.)
EE : Capstan motor speed (Search, double speed)
F F : Tracking value
GGGG: Cassette tape type <2>, 16 bits.
(See EMG detail information <2>.)
HHHH : Supply reel winding diameter data
I I : Capstan motor speed (FF/REW, double speed)
JJJJ: Tape speed data, lower 8 bits.
KKKK : General data display area
LLLL : General data display area
MMMM : General data display area
LSA
LSB
LSC
LSD
Encoder output = Low
or
Trerminal - GND = SHORT
Encoder output = High
or
Trerminal - GND = OPEN
Mechanism mode - Encoder data
1110
9876
543
21
Mechanism mode sequence
No. Position Encoder data
EJECT 0 h = 0000
EJECT1 1 h = 0001
EJECT2 2 h = 0010
ULSTOP 3 h = 0011
UPPER 4 h = 0100
ONSTOP(PLAY) 5 h = 0101
FWD/SS 6 h = 0110
REV/SS 7 h = 0111
OFFSTOP 8 h = 1000
FFREW-BRAKE 9 h = 1001
FFREW A h = 1010
MIDDLE F h = 1111
1
2
3
4
5
6
7
8
9
10
11
12
LSD
LSC
LSB
LSA
GND
12345
During the EMG display, the OSD shows the data on the deck
mode, etc. The details of the display contents are as follows.
Notes:
The display is variable depending on the part No. of the
•
System Control microcomputer (IC3001) built into the
VCR. In the following, refer to the figure carrying the same
two characters as the top two characters of the part
number of your IC.
•
The sensor information in the OSD display contents is par-
tially different from the mechanism sensor information in
EMG detail information <1>.
[For MN* only]
AA BB CC DD EE
FF GG HH I I J J
KK LL MM NN OO
PP QQ RR SS TT
UU VV WW XX YY
[For *HD only]
AA : Deck operation mode (See EMG detail information <1>.)
BB :
Mechanism operation mode (See EMG detail of information <1>.)
CC : Mechanism transition flag
DD : Capstan motor control status
EE : Loading motor control status
F F : Sensor information (See sensor information details.)
GG : Capstan motor speed
HH : Key code (JVC code)
I I : Supply reel winding diameter data, higher 8 bits.
J J : Supply reel winding diameter data, lower 8 bits.
KK : Mechanism sensor information & mechanism mode position
(See EMG detail of information <1>.)
L L : Tape speed data, higher 8 bits.
MM : Tape speed data, lower 8 bits.
NN : Cassette tape type <2>, higher 8 bits.
(See EMG detail of information <2>.)
OO : Cassette tape type <2>, lower 8 bits.
(See EMG detail of information <2>.)
PP : General data display area
YY : General data display area
*FF: Sensor information details
<Display>
** h
********
Cassette tab present = 1
Encoder data
(See Mechanism mode sequence.)
Cassette tab broken = 0
End sensor
Cassette absent = 1
Cassette present = 0
Start sensor
[For both MN*/HD*]
1-5
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