JVC HR-S9850MS User manual

SERVICE MANUAL
No.82888
July 2001
HR-S9850MS
MAGNETOSCOPE
CARACTÉRISTIQUESTECHNIQUES
GÉNÉRALES
Alimentation : CA 220 V – 240 Vd, 50 Hz/60 Hz
Consommation
Alimentation en marche : 25 W
Alimentation en veille : 4,8 W
Températures
Fonctionnement : 5°C à 40°C
Stockage : -20°C à 60°C
Position de fonctionnement
: Seulement horizontale
Dimensions (LxHxP)
: 435 mm x 105 mm x 343 mm
Poids : 4,7 kg
Format : Standard S-VHS/VHS PAL/SECAM
Largeur de bande : 12,65 mm
Vitesse de bande
(VN) : 23,39 mm/s
(LD) : 11,70 mm/s
(EP)* : 7,80 mm/s
Durée maximale d’enregistrement
(VN) : 240 mn avec une cassette vidéo
E-240
(LD) : 480 mn avec une cassette vidéo
E-240
(EP)* : 720 mn avec une cassette vidéo
E-240
* Signaux PAL seulement
VIDÉO/AUDIO
Système de signal : Signaux couleur PAL/SECAM et
signal monochrome CCIR,
625 lignes/50 trames
Système d’enregistrement
: Balayage hélicoïdal DA4
(Double Azimuth)
Entrée : 0,5 Vcc à 2,0 Vcc, 75 ohms,
asymétrique
Sortie : 1,0 Vcc, 75 ohms, asymétrique
Rapport signal/bruit: 45 dB
Résolution horizontale:400 lignes (S-VHS-PAL, VN/LD)
250 lignes (VHS-PAL, VN/LD)
350 lignes (S-VHS-PAL, EP)
220 lignes (VHS-PAL, EP)
240 lignes (VHS-SECAM, VN/LD)
Gamme de fréquence: 70 Hz à 10.000 Hz (Audio normal)
20 Hz à 20.000 Hz (Audio Hi-Fi)
Entrée/sortie : Connecteurs péritélévision à 21
broches:
ENTREE/SORTIE x 1,
ENTREE/DECODEUR x 1
Connecteurs RCA:
ENTREE VIDEO x 1,
ENTREE AUDIO x 1,
SORTIE AUDIO x 1
Connecteurs S-Vidéo:
ENTREE x 1, SORTIE x 1
SYNTONISEUR
Système de syntonisation
: Syntoniseur à synthèse de
fréquence
Capacité de canaux TV
: 99 positions (+ position AUX)
Canaux couverts
MINUTERIE
Référence de l’horloge : Par quartz
Capacité de programmation
: Minuterie sur 1 an/8 programmes
Durée de soutien mémoire
:10mn
ACCESSOIRES
Accessoires fournis : Câble RF,
Câble S-Vidéo,
Câble péritélévision à 21 broches,
Contrôleur satellite,
Boîtier de télécommande à
infrarouge,
Pile “R6” x 2
Gamme SECAM L PAL B/G
Fréquence Canaux Fréquence Canaux
VHF
(LOW) 49 MHz – 65 MHz 2 – 4 47 MHz – 89 MHz E2 – E4 X, Y, Z
VHF
(HIGH) 104 MHz – 300 MHz 5 – 10 CATV 104 MHz – 300 MHz
E5 – E12
S1 – S20
M1 – M10
U1 – U10
Hyper 300 MHz
– 470 MHz CATV 302 MHz – 470 MHz S21 – S41
UHF 470 MHz
– 862 MHz 21 – 69 470 MHz – 862 MHz E21 – E69
Les caractéristiques techniques sont pour le mode VN à
moins d’indication contraire.
Présentation et caractéristiques modifiables sans préavis.
ATTEN T ION
Ce magnétoscope contient des microprocesseurs. Des bruits
électroniques externes ou des interférences peuvent causer
un mauvais fonctionnement. Dans de tels cas, couper
l’alimentation et débrancher le cordon d’alimentation. Puis
le rebrancher et remettre l’alimentation. Sortir la cassette.
Après contrôle de la cassette, faire fonctionner l’appareil
comme d’ordinaire.

TABLE OF CONTENTS
Section Title Page Section Title Page
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 set the “Service position” ................................. 1-4
1.4.2 Precautions for cassete loding in the “Service position”
1.4.3
Cassete loding and ejection methods in the “Service position”
1.5 Mechanism service mode ................................................. 1-4
1.5.1 How to set the “Mechanism service mode” .................. 1-4
1.6 Jig RCU mode................................................................... 1-4
1.6.1 Setting the Jig RCU mode ........................................... 1-4
1.6.2 Setting the User RCU mode ........................................ 1-4
1.7 Emergency display function .............................................. 1-5
1.7.1 Displaying the EMG information .................................. 1-5
1.7.2 Clearing the EMG history ............................................. 1-5
1.7.3 EMG content description.............................................. 1-6
1.7.4 EMG detail information <1> ......................................... 1-7
1.7.5 EMG detail information <2> ......................................... 1-8
1.8 Servicing the video navigation function..............................1-9
1.8.1 Copying the video navigation data ................................ 1-9
1.8.2 Erasing the video navigation data ............................... 1-10
1.8.3 Factory setting level during shipment .........................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 A/C 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 FM waveform linearity ................................................ 2-16
2.3.2 Height and tilt of the A/C head ................................... 2-17
2.3.3 A/C head phase (X-value) .......................................... 2-17
2.3.4 Standard tracking preset ............................................ 2-18
2.3.5 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
3.1.5 EVR Adjustment ........................................................... 3-1
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 D/A level ....................................................................... 3-2
3.3.2 EE Y/PB Y (S-VHS/VHS) level..................................... 3-3
3.3.3 REC color (colour) level ............................................... 3-3
3.3.4 Video EQ (Frequency response).................................. 3-4
3.3.5 Auto picture initial setting ............................................. 3-4
3.4 Audio circuit ....................................................................... 3-4
3.4.1 Audio REC FM ............................................................. 3-4
3.5 PAL/SECAM converter circuit ............................................3-5
3.5.1 fH VCO......................................................................... 3-5
3.5.2 DEMOD Fo ...................................................................3-5
3.5.3 Colour difference level ..................................................3-5
3.5.4 PAL burst position ......................................................... 3-6
3.5.5 SECAM BELL................................................................3-6
4. CHARTS AND DIAGRAMS
NOTES OF SCHEMATIC DIAGRAM ...................................... 4-1
CIRCUIT BOARD NOTES ...................................................... 4-2
4.1 BOARD INTERCONNECTIONS ....................................... 4-3
4.2 MAIN (VIDEO/AUDIO) SCHEMATIC DIAGRAM .............. 4-5
4.3 MAIN (SYSCON) SCHEMATIC DIAGRAM....................... 4-7
4.4 MAIN (SW.REG) SCHEMATIC DIAGRAM........................ 4-9
4.5 MAIN (TUNER) SCHEMATIC DIAGRAM........................ 4-11
4.6 CONNECTION SCHEMATIC DIAGRAM ........................ 4-13
4.7 3D/TBC(2M) SCHEMATIC DIAGRAM ............................ 4-15
4.8 TERMINAL SCHEMATIC DIAGRAM .............................. 4-17
4.9 DEMODULATOR SCHEMATIC DIAGRAM..................... 4-19
4.10 S-SUB SCHEMATIC DIAGRAM ................................... 4-21
4.11 NAVIGATION SCHEMATIC DIAGRAM ......................... 4-23
4.12 SW/DISPLAY, REC SAFETY, JACK, ADV.JOG
SCHEMATIC DIAGRAMS ............................................ 4-25
4.13 SECAM SCHEMATIC DIAGRAM[HR-S9850MS] .......... 4-27
4.14 SECAM CIRCUIT BOARD[HR-S9850MS]..................... 4-28
4.15 P/S CONVERTER SCHEMATIC DIAGRAM
[HR-S9850MS] ..............................................................4-29
4.16 P/S CONVERTER CIRCUIT BOARD[HR-S9850MS] .... 4-31
4.17 MAIN AND AUDIO ERASE CIRCUIT BOARD .............. 4-33
4.18 SW/DISPLAY, REC SAFETY, JACK, ADV.JOG,
DEMODULATORAND S-SUB CIRCUIT BOARDS ..... 4-35
4.19 3D DIGITAL/2M CIRCUIT BOARD ................................ 4-37
4.20 TERMINAL CIRCUIT BOARD........................................ 4-38
4.21 NAVIGATION CIRCUIT BOARD ....................................4-39
4.22
FDP GRID ASSIGNMENT AND ANODE CONNECTION .. 4-40
4.23 REMOTE CONTROLLER SCHEMATIC DIAGRAM ..... 4-41
4.24 CPU PIN FUNCTION .................................................... 4-42
4.25 WAVEFORMS ............................................................... 4-43
4.26 VOLTAGE CHARTS...................................................... 4-45
4.27 SYSTEM CONTROL BLOCK DIAGRAM...................... 4-47
4.28 VIDEO BLOCK DIAGRAM ............................................ 4-49
4.29 AUDIO BLOCK DIAGRAM ............................................ 4-53
5. PARTS LIST
5.1 PACKING AND ACCESSORY ASSEMBLY <M1> ............ 5-1
5.2 FINALASSEMBLY <M2> .................................................. 5-2
5.3 MECHANISM ASSEMBLY <M4> ...................................... 5-4
5.4 ELECTRICAL PARTS LIST............................................... 5-6
MAIN BOARD ASSEMBLY <03> ............................................ 5-6
3D DIGITAL/2M BOARD ASSEMBLY <05> .......................... 5-13
TERMINAL BOARD ASSEMBLY <06> ................................. 5-14
A/C HEAD BOARD ASSEMBLY <12> .................................. 5-16
DEMOD BOARD ASSEMBLY <14> ...................................... 5-16
S-SUB BOARD ASSEMBLY <15> ......................................... 5-16
NAVIGATION BOARD ASSEMBLY <19>............................... 5-17
SW/DISPLAY BOARD ASSEMBLY <28>............................... 5-18
REC SAFETY BOARD ASSEMBLY <32>.............................. 5-18
JACK BOARD ASSEMBLY <36> .......................................... 5-19
ADV.JOG BOARD ASSEMBLY <38>.................................... 5-19
AUDIO ERASE BOARD ASSEMBLY <46>........................... 5-19
LOADING MOTOR BOARDASSEMBLY <55>..................... 5-19
P/S CONVERTER BOARDASSEMBLY <87>.......................5-19
SECAM BOARD ASSEMBLY <88> ....................................... 5-22

Important Safety Precautions
Prior to shipment from the factory, JVC products are strictly inspected to conform with the recognized product safety and electrical codes
of the countries in which they are to be sold. However, in order to maintain such compliance, it is equally important to implement the
following precautions when a set is being serviced.
Fig.1
1. Locations requiring special caution are denoted by labels and
inscriptions on the cabinet, chassis and certain parts of the
product. When performing service, be sure to read and com-
ply with these and other cautionary notices appearing in the
operation and service manuals.
2. Parts identified by the symbol and shaded ( ) parts are
critical for safety.
Replace only with specified part numbers.
Note: Parts in this category also include those specified to com-
ply with X-ray emission standards for products using
cathode ray tubes and those specified for compliance
with various regulations regarding spurious radiation
emission.
3. Fuse replacement caution notice.
Caution for continued protection against fire hazard.
Replace only with same type and rated fuse(s) as specified.
4. Use specified internal wiring. Note especially:
1) Wires covered with PVC tubing
2) Double insulated wires
3) High voltage leads
5. Use specified insulating materials for hazardous live parts.
Note especially:
1) Insulation Tape 3) Spacers 5) Barrier
2) PVC tubing 4) Insulation sheets for transistors
6. When replacing AC primary side components (transformers,
power cords, noise blocking capacitors, etc.) wrap ends of
wires securely about the terminals before soldering.
Power cord
Fig.2
10. Also check areas surrounding repaired locations.
11. Products using cathode ray tubes (CRTs)
In regard to such products, the cathode ray tubes themselves,
the high voltage circuits, and related circuits are specified for
compliance with recognized codes pertaining to X-ray emission.
Consequently, when servicing these products, replace the cath-
ode ray tubes and other parts with only the specified parts.
Under no circumstances attempt to modify these circuits.
Unauthorized modification can increase the high voltage value
and cause X-ray emission from the cathode ray tube.
12. Crimp type wire connector
In such cases as when replacing the power transformer in sets
where the connections between the power cord and power
transformer primary lead wires are performed using crimp type
connectors, if replacing the connectors is unavoidable, in or-
der to prevent safety hazards, perform carefully and precisely
according to the following steps.
1) Connector part number : E03830-001
2) Required tool : Connector crimping tool of the proper type
which will not damage insulated parts.
3) Replacement procedure
(1) Remove the old connector by cutting the wires at a point
close to the connector.
Important : Do not reuse a connector (discard it).
Fig.7
cut close to connector
Fig.3
(2) Strip about 15 mm of the insulation from the ends of
the wires. If the wires are stranded, twist the strands to
avoid frayed conductors.
15 mm
Fig.4
(3) Align the lengths of the wires to be connected. Insert
the wires fully into the connector.
Connector
Metal sleeve
Fig.5
(4) As shown in Fig.6, use the crimping tool to crimp the
metal sleeve at the center position. Be sure to crimp fully
to the complete closure of the tool.
1
v
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

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 compli-
ance with safety standards.
1. Insulation resistance test
Confirm the specified insulation resistance or greater between power cord plug prongs and
externally exposed parts of the set (RF terminals, antenna terminals, video and audio input
and output terminals, microphone jacks, earphone jacks, etc.). See table 1 below.
2. Dielectric strength test
Confirm specified dielectric strength or greater between power cord plug prongs and exposed
accessible parts of the set (RF terminals, antenna terminals, video and audio input and output
terminals, microphone jacks, earphone jacks, etc.). See table 1 below.
3. Clearance distance
When replacing primary circuit components, confirm specified clearance distance (d), (d’) be-
tween soldered terminals, and between terminals and surrounding metallic parts. See table 1
below.
4. Leakage current test
Confirm specified or lower leakage current between earth ground/power cord plug prongs
and externally exposed accessible parts (RF terminals, antenna terminals, video and audio
input and output terminals, microphone jacks, earphone jacks, etc.).
Measuring Method : (Power ON)
Insert load Z between earth ground/power cord plug prongs and externally exposed accessi-
ble parts. Use an AC voltmeter to measure across both terminals of load Z. See figure 9 and
following table 2.
5. Grounding (Class 1 model only)
Confirm specified or lower grounding impedance between earth pin in AC inlet and externally exposed accessible parts (Video in,
Video out, Audio in, Audio out or Fixing screw etc.).
Measuring Method:
Connect milli ohm meter between earth pin in AC inlet and exposed accessible parts. See figure 10 and grounding specifications.
d'
d
Chassis
Power cord,
primary wire
Region
USA & Canada
Europe & Australia
Grounding Impedance (Z)
Z 0.1 ohm
Z 0.5 ohm
≤
≤
AC inlet
Earth pin
Exposed accessible part
Milli ohm meter
Grounding Specifications
Fig. 10
ab
c
V
Externally
exposed
accessible part
Z
Fig. 9
Fig. 8
Clearance Distance (d), (d')
d, d' 3 mm
d, d' 4 mm
d, d' 3.2 mm
1 MΩR 12 MΩ/500 V DC
Dielectric Strength
AC 1 kV 1 minute
AC 1.5 kV 1 miute
AC 1 kV 1 minute
AC Line Voltage
100 V
100 to 240 V
110 to 130 V
110 to 130 V
200 to 240 V
Japan
USA & Canada
Europe & Australia R 10 MΩ/500 V DC
Region
Insulation Resistance (R)
R 1 MΩ/500 V DC
≤
≤
≥≥
≤
≤
≤≤
≤
≤
AC 3 kV 1 minute
(Class 2)
AC 1.5 kV 1 minute
(Class 1)
d 4 mm
d' 8 mm (Power cord)
d' 6 mm (Primary wire)
Table 1 Specifications for each region
a, b, cLeakage Current (i)AC Line Voltage
100 V
110 to 130 V
110 to 130 V
220 to 240 V
Japan
USA & Canada
i 1 mA rms Exposed accessible parts
Exposed accessible parts
Antenna earth terminals
Other terminals
i 0.5 mA rms
i 0.7 mA peak
i 2 mA dc
i 0.7 mA peak
i 2 mA dc
Europe & Australia
Region Load Z
≤
≤
≤
≤
≤
≤
1 kΩ
2 kΩ
1.5 kΩ
0.15 µF
50 kΩ
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.
2S40888-01

1-1
-----------------
[1] Top cover, D1 4(S1a), (S1b)
Bracket 2(S1c)
[2] Front panel assembly D2 CN3012(WR2a) <Note 2a>
4(L2a), 2(L2b),3(L2c) <Note 2b>
(ADV. Jog board assembly) 2(S2a)
[3] Drum assembly D3 CON1(WR3a),
<Note 2b>
CN1(WR3b),
(S3a), (S3b), (S3c)
(Inertia plate) 4(L3a)
(Roller arm assy) (P3), (L3b)
[4] Mechanism assembly D4 CN2001(WR4a), <Note 2b>
(S4a), (S4b), <Note 4a>
(S4c), (S4d),2(L4a)
[5] REC safety board D5 (L5a), <Note 2b>
assembly, <Note 5a>
SW/Display board
CN7001(WR5a),4(L5b)
assembly
Jack board assembly CN7191(WR5b) <Note 5b>
[6] P/S converter D6 2(S6), CN3501(WR6a) <Note 2b>
board assembly CN3502(WR7b)
[7] Main board assemby D7 (S7a),2(S7b),2(S7c)
[8] Bottom cover D8 4(L8a), Foot (rear), <Note 8a>
4(L8b), Foot ass'y,
2 (S8a), 4 (L8c),
3 (L8d)
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,
ADV. Jog board assembly,
Drum assembly
Mechanism assembly
REC safety board assembly,
SW/Display board assembly,
Jack board assembly
P/S converter board assembly
Main board assembly
Bottom cover
[1]
[2]
[3]
[4]
[5]
[6]
[7]
[8]
Step/
LocNo.
Part Name Fig.
No. Point Note
-----------------
(1) (2) (3) (4) (5)
Step/
LocNo.
Part Name Fig.
No. Point Note
[1] Top cover, D1 4(S1a),(S1b),3(L1a), <Note 1a>
2(SD1a),(P1a),(W1a),
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>
• Whenreattachingthe Front panelassembly,make surethat
the door opener "a" of the Cassette holder assembly is low-
ered in position prior to the reinstallation.
• When reattaching the Front panel assembly, pay careful at-
tention to the jack "b" at the Jack board assembly to make it
fit the hole of the Front panel assembly.
<Note 2b>
• Becarefulnot to damage theconnectorand wire etc. during
connection and disconnection. When connecting the wire
to the connector, be careful with the wire direction.
<Note 4a>
• When it is required to remove the screws (S4a to S4b) re-
taining the Mechanism assembly, please refer to the "Pro-
cedures for Lowering the Cassette holder assembly". (See
on pages 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 and
switch on the Main board assembly.
• The wire (WR4a) has excess length that may be loose, as it
is quite long. After inserting the wire and connectors, the
loose portion of the wire should be taken up and accommo-
dated between the A/C head base and the main deck.
<Note 5a>
• The REC safety board assembly is attached to the SW/Dis-
play board assembly. It is therefore necessary to remove
the REC safety board assembly before removing the SW/
Display board assembly.
<Note 5b>
• When reattaching the Jack board assembly, should be at-
tach the Jack board assembly to the Bottom chassis before
attaching the SW/Display board assembly.
<Note 8a>
• When attaching the Bottom cover, make sure that the Earth
plate of the Bottom cover is passed through the hole of the
Bottom chassis and then touches the GND (Ground) on the
Main board assembly.
-----------------
-----------------
-----------------
-----------------

1-2
(L2b)
(L2c)
(L2a)
a<Note 2a>
(L2b) CN3012
(L2a)
[2]
Front
panel
assembly
(S2a)
ADV. Jog board
assembly
WR2a
<Note 2b>
CN7004
WR2a
<Note 2b>
b<Note 2a>
Front panel
backside
Fig. D1 Fig. D3
Fig. D2
Fig. 1
Fig. 2
Fig. 3
(A) (B)
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.
(S1a)
(S1a)
(S1a)
(S1b)
(S1c)
(S1c)
Bracket
[1] Top cover
[1]
Procedures for Lowering the Cassette holder assembly
(S3b)
[3]
Drum
assembly
CN1
CON1
WR3a
<Note 2b>
(L3a)
(L3b)
(P3)
Roller arm
assy
Inertia plate
(L3c)
WR3b
<Note 2b>
Cleaner assy
Not used
Not used
(S3a) (S3c)
Drum shield
(S3d)
Note: When installing the Drum assembly, secure the screws
(S3a to S3c) in the order of a, b, c.
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.

1-3
(S4d)
(L4a)
Spacer
<Note 4a>
(L4a)
Spacer
<Note 4a>
Q3003
End sensor
<Note 4a>
Q3002
Start sensor
<Note 4a>
CN2001
D3001
LED
<Note 4a>
[4]
Mechanism
assembly
(S4c)(S4a)
<Note 4a>
(S4b)
<Note 4a>
WR4a
<Note 2b>
A/C head base
WR4a
Note:
When installing the
Mechanism assembly,
secure the screws
(S4a to S4b) in the
order of a, b.
Fig. D4
Fig. D7
Fig. D5
CN7191
WR5b
<Note 2b>
CN7001
WR5a
<Note 2b>
(L5b)
(L5b)
[5] SW/Display board assembly
[5] Jack board assembly
<Note 5b>
(L5a)
REC Safety
board assembly
<Note 5a>
(S7c)
(S7b)
(S7a)
(S7b)
[7]
Main board
assembly
Fig. D8
[8]
Bottom cover
(L8c)
(L8c)
(L8d)
(L8b)
(L8a)
(L8a)
(L8b)
(S8a)
Foot assy
Foot (rear)
Foot
(rear)
Earth
plate
<Note 8a>
Foot
assy
[6] P/S converter board assembly
WR6a WR6b
Foil side
<Note 2b>
(S6)
(S6)
CN3501
CN3502
Fig. D6

1-4
1.4 Service position
This unit has been designed so that the Mechanism and
Main board assemblies can be removed together from the
chassis assembly. Before diagnosing or servicing the cir-
cuit boards, take out the major parts from the chassis as-
sembly.
1.4.1 How to set the “Service position”
(1) Refer to the disassembly procedure and perform the dis-
assembly of the major parts before removing the Drum
assembly.
(2) Lower the cassette holder to prepare for the removal of
the Mechanism assembly screws. (Refer to the “Proce-
dures for lowering the Cassette holder assembly” of 1.3
Disassembly/assembly method.)
(3) Remove the combined Mechanism and Main board as-
semblies.
(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.1-4-
1a.)
(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
assembly.
Notes:
• Before inserting the power cord plug into the power
outlet, 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 “1.3 Disas-
sembly/assembly method”.
• 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 assemblies. If they
are improperly grounded, there may be noise on the play-
back picture or FDP counter display may move even
when the mechanism is kept in an inoperative status.
• In order to diagnose the playback or recording of the cas-
sette tape, set the Mechanism assembly to the required
mode before placing it upside down. If the mechanism
mode is changed (including ejection) while it is in an up-
side down position the tape inside may be damaged.
1.4.2 Precautions for cassette loading in the “Service
position”
The REC safety board assembly detects cassette loading
as well as cassette tabs. Therefore, after the assembly has
been removed in the “Service position”, it is required to set
the switch manually on the REC safety board assembly
when a cassette is loaded.
1.4.3 Cassette loading and ejection methods in the
“Service position”.
(1)
Insert a cassette halfway in the Cassette holder assembly.
(2) Set the switch on the REC safety board assembly to on
(by pressing the switch).
(3)
As soon as the cassette starts to be loaded, set the switch on
the REC safety board assembly to off (by releasing the switch).
(4) Now the desired operation (recording, playback, fast for-
ward, rewind, etc.) is possible in this status.
(5) The switch on the REC safety board assembly does not
have to be operated when ejecting a tape. But be sure to
turn the set to the normal position before ejecting the tape.
Note:
• In the “Service position”, the cassette tabs cannot be
detected and recording becomes possible even with a
cassette with broken tabs such as the alignment tape.
Be very careful not to erase important tapes.
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”.
1.5.1 How to set the “Mechanism service mode”
(1) Unplug the power cord plug from the power outlet.
(2) Connect TPGND and TP7001(TEST) on the board as-
sembly with a jump wire. (Refer to Fig. 1-4-1a.)
(3) Insert the power cord plug into the power outlet.
(4) 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” of 1.3 Disassembly/assembly method.)
(5) The cassette holder lowers and, when the loading has
completed, the mechanism enters the desired mode.
1.6 Jig RCU mode
This unit uses the following two modes for receiving remote
control codes.
1) User RCU mode : Ordinary mode for use by the user.
2) Jig RCU mode : Mode for use in production and serv-
icing.
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
EEPROM, 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
necessary operations have been completed. These modes can be
set by the operations described below.
1.6.1 Setting the Jig RCU mode
(1) Unplug the power cord plug from the power outlet.
(2) Press and hold the “REC” and “PAUSE” buttons on the
VCR simultaneously, while plugging the power cord plug
into the power outlet.
When the VCR is set to the Jig RCU mode, the symbols
( “ : ” ) in the time display of the FDP are turned off.
1.6.2 Setting the User RCU mode
(1) Turn off the power.
(2) Press the “REC” and “PAUSE” buttons of the VCR si-
multaneously. Alternatively, transmit the code “80” from
the Jig RCU.
Fig. 1-4-1a
TP7001
(TEST)
Jack board assembly
SW/Display board assembly
TPGND
CP4001
CP5302
CP5301
Main board assembly
3D Digital/2M board assembly
S-Sub board assembly
Demod board assembly
Audio erase
board assembly
Terminal board assembly
TP111
D.FF
TP4001
CTL.P
VR1401
D/A LEVEL ADJ TP2253
A.FM TP106
PB.FM
CN902
CN7191
CN3011
CN3012
To ADV.Jog
CN7001
REC Safety
board assembly
Navigation board assembly
P/S Converter board
assembly
CN6102
CN3502
CN3501
SECAM board assembly
CP5303