JVC HR-J271MS User manual

SERVICE MANUAL
No. 82811
July 2000
HR-J271MS/J471MS/J677MS/J777MS
SPECIFICATIONS (The specifications shown pertain specifically to the model HR-J777MS/J677MS)
VIDEO CASSETTE RECORDER
Printed in Japan
VICTOR COMPANY OF JAPAN, LIMITED
VIDEO DIVISION S40894
This service manual is printed on 100% recycled paper.
COPYRIGHT © 2000 VICTOR COMPANY OF JAPAN, LTD.
HR-J271MS/J471MS/J677MS/J777MS No. 82811
PAL NTSC
TM
TM
SP/LP/EP
DISLAY
PR
COLOUR SYSTEM
REC LINK
VIDEO (MONO)L–AUDIO–R
STANDBY/ON
REVIEW
SP
+8
4
0
6
15dB
NORM
MENU
123
456
789
0
1
OK
VCR
CABLE/
DVD/SAT
TV
2
4
EXPRESS
3
PROG 30 SEC
TV PR –
TV PR +
+
TV
TV
–
E
N
T
E
R
/
E
N
T
R
E
E
PR
DATE
STOP
FIN
START
DEBUT
0000 AUX
DAILY/QTDN.
VPS/PDC WEEKLY/HEBDO
AUDIO
TV/VCR
GENERAL
Power requirement
Rating : AC 110 V – 240 V`, 50/60 Hz
Operating : AC 90 V – 260 V`, 50/60 Hz
Power consumption : 19 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 278 mm
Weight : 3.3 kg
Format : VHS standard
Maximum recording time
(SP) : 240 min. with E-240 video cassette
(PAL/MESECAM)
: 160 min. with T-160 video cassette
(NTSC)
(LP) : 480 min. with E-240 video cassette
(PAL/MESECAM)
(EP) : 480 min. with T-160 video cassette
(NTSC)
VIDEO/AUDIO
Signal system : PAL-type colour signal and
CCIR monochrome signal,
625 lines 50 fields
: NTSC colour and EIA
monochrome signals,
525 lines/60 fields
Recording system : DA-4 (Double Azimuth)
head helical scan system
Signal-to-noise ratio : 45 dB
Horizontal resolution : 250 lines (PAL/MESECAM)
: 220 lines (NTSC)
Frequency range : 70 Hz to 10,000 Hz (Normal audio)
20 Hz to 20,000 Hz (Hi-Fi audio)
Input/Output : RCA connectors (IN x 2, OUT x 1)
TUNER/TIMER
TV channel storage
capacity : 99 positions (+AUX position)
Tuning system : Frequency synthesized tuner
Channel coverage : VHF
(Low) 42 MHz – 175 MHz
(High)175 MHz – 470 MHz
UHF
470 MHz – 870 MHz
Aerial output : UHF channels (Adjustable
E28 – E60)
Memory backup time : Approx. 6 months
Estimated figure based on
supplied fresh battery; actual
performance may differ.
ACCESSORIES
Provided accessories : RF cable,
Infrared remote control unit,
"R6/UM-3" battery x 2,
Lithium battery CR2025,
Conversion plug*
*Not provided in certain areas.
www.freeservicemanuals.info
1/21/2018
Digitized in Heiloo Netherlands

Important Safety Precautions
INSTRUCTIONS
1. DISASSEMBLY
1.1 DISASSEMBLY FLOW CHART ............................................................ 1-1
1.2 HOW TO READ THE DISASSEMBLY AND ASSEMBLY...................... 1-1
1.3 DISASSEMBLY/ASSEMBLY METHOD ................................................ 1-1
1.4 SERVICE POSITION ............................................................................ 1-4
1.4.1 How to take out the Mechanism and Main board assemblies ......... 1-4
1.5 MECHANISM SERVICE MODE ........................................................... 1-5
1.5.1 How to set the "MECHANISM SERVICE MODE" ............................ 1-5
1.6 EMERGENCY DISPLAY FUNCTION ................................................... 1-6
1.6.1 Displaying the emergency information ............................................ 1-6
1.6.2 Clearing the emergency history .......................................................1-6
1.6.3 Emergency content description ....................................................... 1-7
1.6.4 Emergency detail information 1 ......................................................1-8
1.6.5 Emergency detail information 2 ......................................................1-9
1.7 SYSCON CIRCUIT ............................................................................. 1-10
1.7.1 Syscon CPU pin function (IC3001) [HR-J677MS, HR-J777MS] .... 1-10
2. MECHANISM ADJUSTMENT
2.1 BEFORE STARTING REPAIR AND ADJUSTMENT ............................. 2-1
2.1.1 Precautions ...................................................................................... 2-1
2.1.2 Checking for Proper Mechanical Operations ...................................2-1
2.1.3 Manually Removing the Cassette Tape ........................................... 2-1
2.1.4 Jigs and Tools Required for Adjustment .......................................... 2-2
2.1.5 Maintenance and Inspection ............................................................ 2-3
2.2 REPLACEMENT OF MAJOR PARTS .................................................. 2-6
2.2.1
Before Starting Disassembling (Phase matching between mechanical parts) 2-6
2.2.2 How to Set the Mechanism Assembling Mode ................................ 2-6
2.2.3 Cassette Holder Assembly .............................................................. 2-6
2.2.4 Pinch Roller Arm Assembly ............................................................. 2-8
2.2.5 Guide Arm Assembly and Press Lever Assembly ............................ 2-8
2.2.6 Audio Control Head .........................................................................2-8
2.2.7 Loading Motor .................................................................................. 2-8
2.2.8 Capstan Motor ................................................................................. 2-9
2.2.9 Pole Base Assembly (supply or take-up side) ................................. 2-9
2.2.10 Rotary Encoder ........................................................................... 2-10
2.2.11 Clutch Unit .................................................................................. 2-10
2.2.12
Change Lever Assembly, Direct Gear, Clutch Gear and Coupling Gear 2-10
2.2.13 Link Lever ................................................................................... 2-11
2.2.14 Cassette Gear, Control Cam and Worm Gear ............................ 2-11
2.2.15 Control Plate ............................................................................... 2-11
2.2.16
Loading Arm Gear (supply or take-up side) and Loading Arm Gear Shaft 2-12
2.2.17 Take-up Lever, Take-up Head and Control Plate Guide ............. 2-13
2.2.18 Capstan Brake Assembly ........................................................... 2-13
2.2.19 Sub Brake Assembly (take-up side) ........................................... 2-13
2.2.20
Main Brake Assembly (take-up side), Reel Disk (take-up side) and
Main Brake Assembly (supply side) ..................................................
2-13
2.2.21 Tension Brake Assembly, Reel Disk (supply side) and
Tension Arm Assembly ............................................................... 2-14
2.2.22 Idler Lever, Idler Arm Assembly .................................................. 2-14
2.2.23 Stator Assembly .......................................................................... 2-14
2.2.24 Rotor Assembly .......................................................................... 2-14
2.2.25 Upper Drum Assembly ................................................................ 2-15
2.3 COMPATIBILITY ADJUSTMENT ........................................................ 2-16
2.3.1 Checking/Adjustment of FM Waveform Linearity ........................... 2-16
2.3.2
Checking/Adjustment of the Height and Tilt of the Audio Control Head 2-17
2.3.3 Checking/Adjustment of the Audio Control Head Phase (X-Value) 2-17
2.3.4 Checking/Adjustment of the Standard Tracking Preset ................. 2-18
2.3.5 Checking/Adjustment of the Tension Pole Position ....................... 2-18
3. ELECTRICAL ADJUSTMENT
3.1 PRECAUTION ...................................................................................... 3-1
3.1.1 Required test equipments ................................................................3-1
3.1.2 Required adjustment tools ...............................................................3-1
3.1.3 Color (colour) bar signal,Color (colour) bar pattern ......................... 3-1
3.1.4 Switch settings and standard precautions ....................................... 3-1
TABLE OF CONTENTS
Section Title Page Section Title Page
HR-J271MS HR-J471MS HR-J677MS HR-J777MS
VIDEO HEAD 2 HEAD 4 HEAD (DA4) 4 HEAD (DA4) 4 HEAD (DA4)
HiFi AUDIO NOT USED NOT USED USED USED
HiFi LEVEL METER NOT USED NOT USED USED USED
FRONT VIDEO/AUDIO INPUT(RCA) NOT USED USED USED USED
VCR PLUS+ NOT USED NOT USED NOT USED SHOW VIEW
REMOTE PAUSE NOT USED NOT USED USED USED
STILL/PAUSE/FRAME ADVANCE REDUCED NOISE NOISELESS NOISELESS NOISELESS
The following table lists the differing points between Models (HR-J271MS, HR-J471MS, HR-J677MS, HR-J777MS) in this series.
3.2 SERVO CIRCUIT .................................................................................. 3-2
3.2.1 Switching point ................................................................................ 3-2
3.2.2 Slow tracking preset ........................................................................ 3-2
3.3 VIDEO CIRCUIT ................................................................................... 3-2
3.3.1 AUTO PICTURE initial setting ......................................................... 3-2
3.4 SYSCON CIRCUIT ............................................................................... 3-3
3.4.1 Timer clock ...................................................................................... 3-3
4. CHARTS AND DIAGRAMS
NOTES OF SCHEMATIC DIAGRAM .......................................................... 4-1
CIRCUIT BOARD NOTES ........................................................................... 4-2
4.1 BOARD INTERCONNECTIONS .......................................................... 4-3
4.2
VIDEO/N.AUDIO SCHEMATIC DIAGRAM [HR-J271MS, HR-J471MS]. 4-5
4.3 SYSTEM CONTROL SCHEMATIC DIAGRAM [HR-J271MS, HR-J471MS] 4-7
4.4 SWITCHING REGULATOR SCHEMATIC DIAGRAM
[HR-J271MS, HR-J471MS] .................................................................. 4-9
4.5 TUNER SCHEMATIC DIAGRAM [HR-J271MS, HR-J471MS] ........... 4-11
4.6 DISPLAY AND MINI FRONT SCHEMATIC DIAGRAMS
[HR-J271MS, HR-J471MS] ................................................................ 4-13
4.7 BS CONNECTION AND LITHIUM BATTERY SCHEMATIC
DIAGRAMS [HR-J271MS, HR-J471MS] ............................................ 4-15
4.8 TERMINAL SCHEMATIC DIAGRAM [HR-J271MS, HR-J471MS] ..... 4-16
4.9 BOARD INTERCONNECTIONS [HR-J677MS, HR-J777MS] ............ 4-17
4.10
VIDEO/AUDIO SCHEMATIC DIAGRAM [HR-J677MS, HR-J777MS] .. 4-19
4.11 ON SCREEN SCHEMATIC DIAGRAM [HR-J677MS, HR-J777MS] 4-21
4.12 SYSTEM CONTROL AND LITHIUM BATTERY SCHEMATIC
DIAGRAMS [HR-J677MS, HR-J777MS] .......................................... 4-23
4.13 SWITCHING REGULATOR SCHEMATIC DIAGRAM
[HR-J677MS, HR-J777MS] .............................................................. 4-25
4.14 TUNER SCHEMATIC DIAGRAM [HR-J677MS, HR-J777MS] ......... 4-27
4.15 DISPLAY AND MINI OPE SCHEMATIC DIAGRAMS
[HR-J677MS, HR-J777MS] .............................................................. 4-29
4.16 TERMINAL AND R.PAUSE SCHEMATIC DIAGRAMS
[HR-J677MS, HR-J777MS] .............................................................. 4-31
4.17 DEMODULATOR SCHEMATIC DIAGRAM [HR-J777MS] ............... 4-33
4.18
MAIN, A/C HEAD, MINI FRONT, LITHIUM BATTERY AND
LOADING MOTOR CIRCUIT BOARDS [HR-J271MS, HR-J471MS] ........
4-37
4.19
MAIN, A/C HEAD, MINI OPE, R.PAUSE, LITHIUM BATTERY AND
LOADING MOTOR CIRCUIT BOARDS [HR-J677MS, HR-J777MS] ...
4-41
4.20 DEMODULATOR CIRCUIT BOARD [HR-J777MS] ......................... 4-43
4.21 FDP GRID ASSIGNMENT AND ANODE CONNECTION ............... 4-44
4.22 REMOTE CONTROL SCHEMATIC DIAGRAM ............................... 4-45
4.23 VOLTAGE CHARTS [HR-J271MS, HR-J471MS] ............................4-46
4.24 VOLTAGE CHARTS [HR-J677MS, HR-J777MS] ............................4-47
4.25 SYSTEM CONTROL BLOCK DIAGRAM ......................................... 4-49
4.26 VIDEO BLOCK DIAGRAM ............................................................... 4-51
4.27 AUDIO BLOCK DIAGRAM [HR-J271MS, HR-J471MS] ................... 4-53
4.28 AUDIO BLOCK DIAGRAM [HR-J677MS, HR-J777MS] ................... 4-55
5. PARTS LIST
5.1 PACKING AND ACCESSORY ASSEMBLY <M1> ............................... 5-1
5.2 CABINET AND CHASSIS ASSEMBLY <M2> ...................................... 5-2
5.3 MECHANISM ASSEMBLY <M4> ......................................................... 5-4
5.4 ELECTRICAL PARTS LIST .................................................................. 5-6
MAIN BOARD ASSEMBLY(HR-J271MS/J471MS)<03> ........................... 5-6
MAIN BOARD ASSEMBLY(HR-J677MS/J777MS)<03> ......................... 5-11
AUDIO CONTROL HEAD BOARD ASSEMBLY <12> ............................ 5-16
DEMOD BOARD ASSEMBLY(HR-J777MS) <14> .................................. 5-16
MINI FRONT BOARD ASSEEMBLY(HR-J271MS/J471MS)<28> ........... 5-17
MINI OPE BOARD ASSEEMBLY(HR-J677MS/J777MS)<28> ............... 5-17
LOADING MOTOR BOARD ASSEMBLY <55> ....................................... 5-17
R.PAUSE BOARD ASSEMBLY(HR-J677MS/J777MS)<91> .................. 5-17
LT.BATTERY BOARD ASSEMBLY(HR-J271MS/J471MS)<93> ............. 5-17
LT.BATTERY BOARD ASSEMBLY(HR-J677MS/J777MS)<93> ............. 5-17
www.freeservicemanuals.info
1/21/2018
Digitized in Heiloo Netherlands

Important Safety Precautions
Prior to shipment from the factory, JVC products are strictly inspected to conform with the recognized product safety and electrical codes of the
countries in which they are to be sold. However, in order to maintain such compliance, it is equally important to implement the following precautions
when a set is being serviced.
Fig.1
1. Locations requiring special caution are denoted by labels and in-
scriptions 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 serv-
ice manuals.
2. Parts identified by the !symbol and shaded ( ) parts are
critical for safety.
Replace only with specified part numbers.
Note: Parts in this category also include those specified to com-
ply with X-ray emission standards for products using
cathode ray tubes and those specified for compliance
with various regulations regarding spurious radiation
emission.
3. Fuse replacement caution notice.
Caution for continued protection against fire hazard.
Replace only with same type and rated fuse(s) as specified.
4. Use specified internal wiring. Note especially:
1) Wires covered with PVC tubing
2) Double insulated wires
3) High voltage leads
5. Use specified insulating materials for hazardous live parts. Note
especially:
1) Insulation Tape 3) Spacers 5) Barrier
2) PVC tubing 4) Insulation sheets for transistors
6. When replacing AC primary side components (transformers, power
cords, noise blocking capacitors, etc.) wrap ends of wires securely
about the terminals before soldering.
Power cord
Fig.2
10. Also check areas surrounding repaired locations.
11. Products using cathode ray tubes (CRTs)
In regard to such products, the cathode ray tubes themselves, the
high voltage circuits, and related circuits are specified for compli-
ance with recognized codes pertaining to X-ray emission.
Consequently, when servicing these products, replace the cath-
ode ray tubes and other parts with only the specified parts. Under
no circumstances attempt to modify these circuits.
Unauthorized modification can increase the high voltage value and
cause X-ray emission from the cathode ray tube.
12. Crimp type wire connector
In such cases as when replacing the power transformer in sets
where the connections between the power cord and power trans-
former primary lead wires are performed using crimp type connec-
tors, 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.7
cut close to connector
Fig.3
(2) Strip about 15 mm of the insulation from the ends of the
wires. If the wires are stranded, twist the strands to avoid
frayed conductors.
15 mm
Fig.4
(3) Align the lengths of the wires to be connected. Insert the
wires fully into the connector.
Connector
Metal sleeve
Fig.5
(4) As shown in Fig.6, use the crimping tool to crimp the metal
sleeve at the center position. Be sure to crimp fully to the
complete closure of the tool.
I
•Precautions during Servicing
7. Observe that wires do not contact heat producing parts (heatsinks,
oxide metal film resistors, fusible resistors, etc.)
8. Check that replaced wires do not contact sharp edged or pointed
parts.
9. When a power cord has been replaced, check that 10-15 kg of
force in any direction will not loosen it.
1.25
2.0
5.5
Crimping tool
Fig.6
(5) Check the four points noted in Fig.7.
Not easily pulled free Crimped at approx. center
of metal sleeve
Conductors extended
Wire insulation recessed
more than 4 mm
S40888-01
www.freeservicemanuals.info
1/21/2018
Digitized in Heiloo Netherlands

•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 exter-
nally 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 acces-
sible parts of the set (RF terminals, antenna terminals, video and audio input and output terminals,
microphone jacks, earphone jacks, etc.). See table 1 below.
3. Clearance distance
When replacing primary circuit components, confirm specified clearance distance (d), (d’) be-
tween soldered terminals, and between terminals and surrounding metallic parts. See table 1
below.
4. Leakage current test
Confirm specified or lower leakage current between earth ground/power cord plug prongs and
externally exposed accessible parts (RF terminals, antenna terminals, video and audio input and
output terminals, microphone jacks, earphone jacks, etc.).
Measuring Method : (Power ON)
Insert load Z between earth ground/power cord plug prongs and externally exposed 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.
Fig. 10
Fig. 9
Fig. 8
Table 1 Specifications for each region
Table 2 Leakage current specifications for each region
Note: These tables are unofficial and for reference only. Be sure to confirm the precise values for your particular country and locality.
II
S40888-01
ab
c
V
A
Externally
exposed
accessible part
Z
www.freeservicemanuals.info
1/21/2018
Digitized in Heiloo Netherlands

1-1
SECTION 1
DISASSEMBLY
1.3 DISASSEMBLY/ASSEMBLY METHOD
1.1 DISASSEMBLY FLOW CHART
This flowchart lists the disassembling steps for the cabinet
parts and P.C. boards in order to gain access to item(s) to
be serviced. When reassembling, perform the step(s) in re-
verse order. Bend, route and dress the flat cables as they
were originally laid.
1.2
HOW TO READ THE DISASSEMBLY AND ASSEMBLY
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
Top cover, Bracket
Front panel assembly
Drum assembly
Mechanism assembly
Main board assembly
Mini ope (Mini front) board assembly
1
2
3
4
5
Step/
Loc No.
Part Name Fig.
No. Point Note
-----------------
1 Top cover D1 2(S1a), (S1b)
Bracket 2(S1c)
2 Front panel assembly D2 7(L2) <Note 2a>
<Note 2b>
3 Drum assembly D3 3(S3),
<Note 3>
CON1(WR3a),
CN1(WR3b)
(Cleaner assy) (L3c)
4 Mechanism assembly D4 2(S4a), (S4b), <Note 3>
(S4c), 2(L4), <Note 4>
CN1(WR4)
5 Main board assembly D5 (S5), 6(L5a)
Mini ope board (L5b), <Note 3>
assembly CN7003(WR5) <Note 5>
[HR-J677MS/J777MS]
Mini front board (L5b)
assembly CN7001(WR5)
[HR-J271MS/J471MS]
-----------------
(1) (2) (3) (4) (5)
Step/
Loc No.
Part Name Fig.
No. Point Note
1 Top cover, D1 4(S1a),(S1b),3(L1a), <Note 1>
2(SD1a),(P1a),
CN1(WR1a),
Bracket 2(S1c)
<Example>
(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 2a>
• When reattaching the Front panel assembly, make sure that
the door opener a of the Cassette holder assembly is low-
ered in position prior to the reinstallation.
<Note 2b>
• When reattaching the Front panel assembly, pay careful at-
tention to the switch lever not to make it touch the switch
knob b of the Main board assembly from the side.
(If the switch knob of the Main board assembly is damaged,
cassette loading is impossible.)
<Note 3>
• Be careful not to damage the connector and wire etc. during
connection and disconnection.
When connecting the wire to the connector, be careful with
the wire direction.
<Note 4>
• When it is required to remove the screws (S4a) retaining
the Mechanism assembly, please refer to the “Procedures
for Lowering the Cassette holder assembly”(See on page
1-2).
• When removing the Mechanism assembly only, unhook the
two spacers connecting it with the Main board assembly
with pliers from the back side of the Main board assembly
first, and then remove the Mechanism assembly.
• When reattaching the Mechanism assembly to the Main
board assembly, take care not to damage the sensors on
the Main board assembly (D3001: LED, Q3001/Q3002: Start
sensor, Q3002/Q3003: End sensor).
<Note 5>
• When removing the PC Support from the bottom chassis,
take care not to damage the locking portion of the PC Sup-
port.
www.freeservicemanuals.info
1/21/2018
Digitized in Heiloo Netherlands

1-2
Fig. D1 Fig. D3
Fig. D2
Fig. 1
Fig. 2
Fig. 3
Turn the loading motor pulley in the direction as indicated by
Fig.2. As both A and B levers are lodged twice, push the
levers in the direction as indicated by Fig.3 to release them.
When pushing the levers, do it in the order of A , B , B , A .
When the holder has been lowered, turn the pulley until the
cassette holder is securely in place without allowing any up/
down movement.
Procedures for Lowering the Cassette holder assembly
As the mechanism of this unit is integrated with the Housing
assembly, the holder must be lowered and the two screws un-
screwed when removing the Mechanism assembly.
(S1b)
1
(S1a)
(S1a)
(S1c)
Bracket
1
(S1c)
Procedures for Lowering the Cassette holder assembly
(L2)
(L2)
<Note 2a>
<Note 2b>
(L2)
2
(S3)
3
CN1
ac
CON1
b
WR3a
Foil side
<Note 3>
(S3)
(L3a)
(L3b)
(P3)
Roller arm
assy
Inertia plate
(L3c)
WR3b
Foil side
<Note 3>
Cleaner assy
Not use
NOTE: When installing the DRUM assembly, secure the
screws (S3) in the order of a , b , c .
www.freeservicemanuals.info
1/21/2018
Digitized in Heiloo Netherlands

1-3
Fig. D4 Fig. D5
NOTE: When installing the DRUM assembly, secure the
screws (S4a) in the order of a , b .
D3001
LED
(L4)
4
ba
(L4)
Spacer
<Note 4>
Spacer
<Note 4>
Q3002[HR-J271MS/
J471MS]
Q3003[HR-J677MS/
J777MS]
End sensor
<Note 4>
Q3001[HR-J271MS/J471MS]
Q3002[HR-J677MS/J777MS]
Start sensor
<Note 4>
<Note 4>
WR4
Foil side
<Note 3>
CN1
(S4a)
<Note 4> (S4b)
(S4c)
(L5a)
(S5)
CN7001[HR-J271MS/J471MS]
CN7003[HR-J677MS/J777MS]
WR5
Foil side
<Note 3>
Mini front board assembly
[HR-J271MS/J471MS]
Mini ope board assembly
[HR-J677MS/J777MS]
(L5b)
Pc support
<Note 5>
5
www.freeservicemanuals.info
1/21/2018
Digitized in Heiloo Netherlands

1-4
(5) Connect the power cord to the wall socket, and lift the
cassette holder.
(Before turning on the power make sure that there is noth-
ing which may produce a short circuit, such as faulty sol-
dering.)
(6) When performing a diagnosis or repair of the Main board
assembly with a cassette tape in place, turn on the power,
insert a cassette tape, and turn over the Main board and
Mechanism assemblies together.
Note:
•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 the FDP counter display may
move even when the mechanism is kept in an inopera-
tive status.
•When performing diagnostics of the tape playback or
recording condition in the “SERVICE POSITION”, en-
ter the desired mode before turning the set upside
down, and do not change the mode during diagnos-
tics while the set is placed upside down. If you want
to switch the mode, turn the set to the normal posi-
tion.
Fig. 1-4-2
Fig. 1-4-1
(4) Remove the Main board and Mechanism assemblies to-
gether while holding the edge of the Main board assem-
bly. At this stage be careful of the power cord and prongs
of the jacks on the back side. (See Fig. 1-4-2.)
C
D
1.4 SERVICE POSITION
In order to facilitate diagnosis and the repair of the Mecha-
nism assembly, this unit is constructed so as to allow the
Mechanism and Main board assemblies to be removed to-
gether from the Bottom chassis assembly.
1.4.1 How to take out the Mechanism and Main board
assemblies
(1) Remove the Top cover, Bracket, Front panel assembly,
and Mini ope (Mini front) board assembly. (See 1.3 DIS-
ASSEMBLY/ASSEMBLY METHOD.)
(2) Lower the cassette holder, and make the preparations re-
quired in order to remove the screws from the Mecha-
nism assembly. (Refer to the “Procedures for Lowering
the Cassette holder assembly”on page 1-2 of 1.3 DIS-
ASSEMBLY/ASSEMBLY METHOD.)
(3) Take out 2 screws A , 1 screw B , 1 screw C and 1
screw D as shown in Fig. 1-4-1.
Fig. 1-4-3
MAIN BOARD ASSEMBLY
<03>
www.freeservicemanuals.info
1/21/2018
Digitized in Heiloo Netherlands

1-5
Fig. 1-5-1
1.5.1 How to set the "MECHANISM SERVICE MODE"
(1) Disconnect VCR from AC.
(2) Connect TPGND and TP7001(TEST) on the Main board
assembly with a jump wire.
1.5 MECHANISM SERVICE MODE
This model has a unique function to enter the mechanism
into every operation mode without loading of any cassette
tape. This function is called the "MECHANISM SERVICE
MODE".
TP7001
TEST
To Mini fron
t
TPGND
CP4001
CN7001
CP5302
TP106
PB.FM
TP4001
CTL.P
TP111
D.FF
Main board
assembly
C3018
Timer clock
(3) Connect VCR to AC.
(4) Press the POWER button.
(5) With lock levers A B on the left and right of the Cas-
sette holder assembly pulled toward the front, slide the
holder in the same direction as the cassette insertion di-
rection. (For the positions of lock levers A B , refer to
the “Procedures for Lowering the Cassette holder assem-
bly”on page 1-2 of 1.3 DISASSEMBLY/ASSEMBLY
METHOD.)
(6) The cassette holder lowers and, when the loading has
completed, the mechanism enters the desired mode.
CP5302
CP5301
TP7001
TEST
TPGND
TP2253
A.PB.FM
TP4001
CTL. P
TP106
PB. FM
CP4001
TP111
D.FF
Main board
assembly
Demodulator
board assembly
C3025
Timer clock
To Mini ope
CN7003
Fig. 1-5-2
[HR-J271MS, HR-J471MS]
[HR-J677MS, HR-J777MS]
www.freeservicemanuals.info
1/21/2018
Digitized in Heiloo Netherlands

1-6
1.6 EMERGENCY DISPLAY FUNCTION
This unit has a function for storing the history of the past two
emergencies (EMG) and displaying them on each FDP. With
the status of the VCR and mechanism at the moment an emer-
gency occurred can also be confirmed.
Notes:
•
The emergency detail display 1 2 show the information
on the latest emergency.
It becomes “––: ––: ––” when there is no latest emer-
gency record.
• When using the Jig RCU, set its custom code to match
the custom code of the VCR.
FDP display switching
FDP display
0 : 00 : 00
Emergency detail display 2
Emergency detail display 1
Emergency content display
(E:Latest:Previous)
Normal display
*1: *2 : 34
E: **: **
*5: *6 : *7
Fig. 1-6-1 Jig RCU [PTU94023B]
Note:
•
For the emergency content, see “1.6.3 Emergency con-
tent description”.
(2) Transmit the code “59”from the Jig RCU again.
The FDP shows the emergency detail information 1 in the
form of “*1 : *2 : 34”.
*1: Deck operation mode at the moment of emergency
*2: Mechanism operation mode at the moment of emer-
gency
3–: Mechanism sensor information at the moment of
emergency
–4:Mechanism mode position at the moment of emer-
gency
Note:
• For the emergency detail information 1 , see “1.6.4 Emer-
gency detail information
1 ”.
(3) Transmit the code “59”from the Jig RCU once again.
The FDP shows the emergency 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)
Note:
•
For the emergency detail information 2 , see “1.6.5 Emer-
gency detail information
2 ”.
(4) Transmit the code “59”from the Jig RCU once again to re-
set the display.
1.6.2 Clearing the emergency history
(1) Display the emergency history.
(2) Transmit the code “36”from the Jig RCU.
(3) Reset the emergency display.
Example 1 E : 01 : 03
Previous emergency
Latest emergency
No emergency record
Example 2 E : ––:
––
1.6.1 Displaying the emergency information
(1) Transmit the code “59”from the Jig RCU.
The FDP shows the emergency content in the form of
“E:**:**”.
INITIAL MODE
DATA CODE
CUSTOM CODE
43: A CODE
53: B CODE
[Data transmitting method]
Depress the “ ” ( 3 ) button
after the data code is set.
Jig RCU
(Y292-03e)
www.freeservicemanuals.info
1/21/2018
Digitized in Heiloo Netherlands