JVC HR-S9800U User manual

No. 82805
June 2000
HR-S9800U
SPECIFICATIONS
CANCEL
TIMER
START STOP DATE
PLAY
REW
REC
STOP
PAUSE
FF
CH
POWER
TV/VCR
C. RESET
DBS
. , ? ABC DEF
DHI JKL MNO
PQRS TUV WXYZ
DAILY(M-F)
AUX
WEEKLY
PROG
CHECK
PROG SP/EP SKIP SEARCH
A/B DISPLAY ENTER/OSD
A.MONITOR
VCR TV CABLE/DBS
123
456
789
0
2
4
1
3
EXPRESS PROGRAMMING
JOG/
SHUTTLE
M
E
N
U
O
K
N
A
V
I
G
A
T
I
O
N
TV CH +
TV CH –
TV
VOL
+
TV
VOL
–
This service manual is printed on 100% recycled paper.
COPYRIGHT © 2000 VICTOR COMPANY OF JAPAN, LTD.
VIDEO CASSETTE RECORDER
SERVICE MANUAL
GENERAL
Power requirement : AC 120 V`, 60 Hz
Power consumption
Power on : 27 W
Power off : 2.6 W
Temperature
Operating : 5°C to 40°C (41°F to 104°F)
Storage : –20°C to 60°C (–4°F to140°F)
Operating position : Horizontal only
Dimensions (W x H x D) : 437 mm x 97 mm x 347 mm
(17-1/4" x 3-7/8" x 13-11/16")
Weight : 4.8 kg (10.6 lbs)
Format : S-VHS/VHS NTSC standard
Maximum recording time
SP : 210 min. with ST-210 video cassette
EP : 630 min. with ST-210 video cassette
VIDEO/AUDIO
Signal system :
NTSC-type color signal and EIA
monochrome signal, 525 lines/60 fields
Recording/
Playback system : DA-4 (Double Azimuth) head helical
scan system
Signal-to-noise ratio : 45 dB
Horizontal resolution
VHS : 230 lines
S-VHS : 400 lines
Frequency range
Normal audio : 70 Hz to 10,000 Hz
Hi-Fi audio : 20 Hz to 20,000 Hz
Input/Output : RCA connectors (IN x 2, OUT x 1)
S-video connectors (IN x 2, OUT x 1)
TUNER
Tuning system : Frequency-synthesized tuner
Channel coverage
VHF : Channels 2–13
UHF : Channels 14–69
CATV : 113 Channels
RF output : Channel 3 or 4 (switchable; preset
to Channel 3 when shipped) 75 Ω,
unbalanced
TIMER
Clock reference : Quartz
Program capacity : 1-year programmable timer/
8 programs
Memory backup time : Approx. 3 min.
ACCESSORIES
Provided accessories : Infrared remote control unit,
“AA” battery x 2,
Audio/video cable,
RF cable (F-type),
S-video cable (4-pin),
S-VHS ET labels,
Controller
Specifications shown are for SP mode unless specified otherwise.
E. & O.E. Design and specifications subject to change without notice.

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
1.4.2
Precautions for cassette loading in the "SERVICE POSITION" 1-5
1.4.3 Cassette loading and ejection methods in the
“SERVICE POSITION”(See Fig. 1-4-3). .................... 1-5
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) 1/2 .................... 1-10
1.7.2 Syscon CPU pin function (IC3001) 2/2 .................... 1-11
1.8 SERVICING THE VIDEO NAVIGATION FUNCTION .... 1-12
1.8.1 Copying the video navigation data .......................... 1-12
1.8.2 Erasing the video navigation data (Initialization) ..... 1-13
1.8.3 Factory setting level during shipment ...................... 1-13
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
TABLE OF CONTENTS
Section Title Page Section Title Page
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
3.2.3 Dynamic Drum preset ................................................ 3-2
3.3 VIDEO CIRCUIT ............................................................. 3-3
3.3.1 D/A level .................................................................... 3-3
3.3.2 EE Y level .................................................................. 3-3
3.3.3 PB Y level (S-VHS / VHS) ......................................... 3-3
3.3.4 REC color (colour) level ............................................ 3-4
3.3.5 Video EQ (Frequency response) ............................... 3-4
3.3.6 AUTO PICTURE initial setting ................................... 3-5
3.4 AUDIO CIRCUIT ............................................................. 3-5
3.4.1 Audio REC FM .......................................................... 3-5
3.5 DEMODULATOR CIRCUIT ............................................. 3-5
3.5.1 Input level .................................................................. 3-5
3.5.2 Stereo VCO ............................................................... 3-5
3.5.3 Stereo filter ................................................................ 3-6
3.5.4 Separation - 1 ............................................................ 3-6
3.5.5 Separation - 2 ............................................................ 3-6
3.5.6 SAP VCO ................................................................... 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
VIDEO/AUDIO AND AUDIO ERASE SCHEMATIC DIAGRAMS 4-5
4.3 VSC SCHEMATIC DIAGRAM ........................................ 4-7
4.4 SYSTEM CONTROL SCHEMATIC DIAGRAM .............. 4-9
4.5 SWITCHING REGULATOR SCHEMATIC DIAGRAM .. 4-11
4.6 TUNER SCHEMATIC DIAGRAM ................................. 4-13
4.7 CONNECTION SCHEMATIC DIAGRAM ..................... 4-15
4.8 3D DIGITAL/4M SCHEMATIC DIAGRAM .................... 4-17
4.9 TERMINAL SCHEMATIC DIAGRAM ........................... 4-19
4.10 DEMODULATOR SCHEMATIC DIAGRAM ............... 4-21
4.11 S-SUB SCHEMATIC DIAGRAM ................................ 4-23
4.12 NAVIGATION SCHEMATIC DIAGRAM .................... 4-25
4.13 SW/DISPLAY, REC SAFETY, JACK AND JOG
SCHEMATIC DIAGRAMS ......................................... 4-27
4.14 GR SCHEMATIC DIAGRAM ..................................... 4-29
4.15 MAIN, AUDIO ERASE, A/C HEAD AND
LOADING MOTOR CIRCUIT BOARDS .................... 4-33
4.16 3D DIGITAL/4M CIRCUIT BOARD ............................ 4-35
4.17 TERMINAL CIRCUIT BOARD ................................... 4-36
4.18 DEMODULATOR CIRCUIT BOARD ......................... 4-37
4.19 S-SUB CIRCUIT BOARD .......................................... 4-37
4.20 NAVIGATION CIRCUIT BOARD ............................... 4-39
4.21 GR CIRCUIT BOARD ................................................ 4-40
4.22 SW/DISPLAY, REC SAFETY, JACK AND JOG
CIRCUIT BOARDS .................................................... 4-41
4.23
FDP GRID ASSIGNMENT AND ANODE CONNECTION 4-43
4.24 REMOTE CONTROL SCHEMATIC DIAGRAM ......... 4-44
4.25 VOLTAGE CHARTS .................................................. 4-45
4.26 SYSTEM CONTROL BLOCK DIAGRAM .................. 4-49
4.27 VIDEO BLOCK DIAGRAM ........................................ 4-51
4.28 AUDIO BLOCK DIAGRAM ........................................ 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 <03> ......................................... 5-6
3D DIGITAL/4M BOARD ASSEMBLY <05> ...................... 5-12
TERMINAL BOARD ASSEMBLY <06> .............................. 5-13
AUDIO CONTROL HEAD BOARD ASSEMBLY <12> ....... 5-14
DEMOD BOARD ASSEMBLY <14> .................................. 5-14
S-SUB BOARD ASSEMBLY <15> ..................................... 5-15
NAVIGATION BOARD ASSEMBLY <19> .......................... 5-15
DISPLAY BOARD ASSEMBLY <28> ................................. 5-16
REC SAFETY BOARD ASSEMBLY <32> ......................... 5-17
S JACK BOARD ASSEMBLY <36> ................................... 5-17
JOG BOARD ASSEMBLY <37> ........................................ 5-17
AUDIO ERASE BOARD ASSEMBLY <46> ....................... 5-17
LOADING MOTOR BOARD ASSEMBLY <55> ................. 5-17
GR BOARD ASSEMBLY <96> .......................................... 5-17

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.
1
•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

•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 1model 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.
2
S40888-01
ab
c
V
A
Externally
exposed
accessible part
Z

1-1
----------------
1Top cover D1 4(S1)
2Bottom cover D2 (S2a), 2(S2b), <NOTE 2>
3(L2a), 4(L2b)
EARTH PLATE
3Bracket D3 2(S3)
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
reverse order. Bend, route and dress the flat cables as they
were originally laid.
STEP
/LOC
NO. PART NAME FIG.
NO. POINT NOTE
1.2 HOW TO READ THE DISASSEMBLY AND ASSEMBLY
(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,unpluged,unclamped or unsoldered.
P = Spring,
W = Washer, S = Screw, L = Locking tab,
CNxx(WRxx) = Remove the wire (WRxx) from the connector
(CNxx).
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
<NOTE2>
•
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.
<NOTE4a>
•
Be careful not to damage the connector and wire etc. during connec-
tion and disconnection.
When connecting the wire to the connector, be careful with the wire
direction.
<NOTE4b>
•
When reattaching the Front panel assembly, make sure that the door
opener
a
of the Cassette holder assembly is lowered in position prior
to the reinstallation.
<NOTE6a>
•
When it is required to remove the screws (S6a) retaining the Mecha-
nism assembly, please refer to the “Procedures for Lowering the Cas-
sette 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 Mecha-
nism assembly.
•
When reattaching the Mechanism assembly to the Main board as-
sembly, take care not to damage the sensors on the Main board as-
sembly (D3001: LED, Q3002: Start sensor, Q3003: End sensor, S3002
: S cassette switch).
<NOTE6b>
•
The wire (WR6) 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 accommodated between the A/C head
base and the main deck.
<NOTE7>
•
The REC safety board assembly is attached to the SW/Display board
assembly. It is therefore necessary to remove the REC safety board
assembly before removing the SW/Display board assembly.
Top cover
Bottom cover
Bracket
Front panel assembly
Drum assembly
Mechanism assembly
SW/Display board assembly
Main/GR board assemblies
(1) (2) (3) (4) (5)
----------------
STEP
/LOC
NO. PART NAME FIG.
NO. POINT NOTE
----------------
1Top cover D1 4(S1)
2Bottom cover D2 (S2a), 2(S2b), <NOTE 2>
3(L2a), 4(L2b)
EARTH PLATE
3Bracket D3 2(S3)
4Front panel assembly D4 9(L4a),
<NOTE 4a>
CN901(WR4a), <NOTE 4b>
CN902(WR4b),
CN3012(WR4c)
2(S4), 2(L4b),
JACK board assy
5Drum assembly D5 3(S5), 4(L5a),
<NOTE 4a>
(L5b), (P5),
CON1(WR5a),
CN1(WR5b)
Inertia plate,
Roller arm assy
6Mechanism assembly D6 2(S6a), 2(S6b),
<NOTE 4a>
2(L6), <NOTE 6a>
CN1(WR6) <NOTE 6b>
7SW/Display board D7 CN7001(WR7),
<NOTE 4a>
assembly (L7a), <NOTE 7>
REC safety
board assy,
4(L7b), 4(L7c)
8Main board assembly D8 2(S8a), (S8b)
GR board assembly (S8c), (L8) <NOTE4a>
-------------------- --------------------------
----------------

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 Åand ılevers 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 Å, ı, ı, Å.
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.
1
(S1)
(S1)
(S1)
Procedures for Lowering the Cassette holder assembly
2
(S2a)
(S2b)
(L2b)
(L2b)
(L2a)
EARTH
PLATE
<NOTE 2>
3
(S3)

1-3
Fig. D4
Fig. D6
Fig. D5
NOTE: When installing the DRUM assembly, secure the
screws (S5) in the order of a, b, c.
Fig. D7
(L4a)
WR4c FOIL SIDE
<NOTE4a>
(L4a)
a <NOTE4b>
4
(L4a)
(L3)
(S5)
CN7192CN7191
FRONT PANEL
BACK SIDE
JACK board
assembly
(S4) (S4)
(L4b)
WR4b WR4a
(L4b)
CN901
CN3012
WR4a
FOIL SIDE
<NOTE 4a>
WR4b
SUPPORTING
TAPE SIDE
<NOTE 4a>
CN902
(S5)
WR5b
WR5a
5
CN1
CN3501
ac
CON1
b
FOIL SIDE
<NOTE 4a>
FOIL SIDE
<NOTE 4a>
(S5)
(L5a)
(L5b)
(P5)
ROLLER ARM
ASSEMBLY
INERTIA PLATE
(S6b)
(S6b)
(S6a)
<NOTE6a>
6
(L6)
Spacer
<NOTE6a>
(L6)
Spacer
<NOTE6a>
Q3003
End sensor
<NOTE6a>
Q3002
Start sensor
<NOTE6a>
WR6
FOIL SIDE
<NOTE4a>
<NOTE6b>
A/C head base
WR6
CN1
D3001
LED
<NOTE6a> S3002
S cassette switch
<NOTE6a>
(L7c) WR7
CN7001
SUPPORTING
TAPE SIDE
<NOTE2>
(L7b)
7
(L7a)
REC SAFETY
board assembly
<NOTE7>

1-4
Fig. D8
8
(S8a)
(S8b)
(S8c)
(L8)
CN1902
FOIL SIDE
<NOTE4a>
CN1901
WR8
GR board
assembly
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 JACK board assembly. (Refer to 1.3 DISASSEMBLY/
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 Åand 2 screws ıas shown in Fig.
1-4-1.
(4) Remove the flat wires from CN3011 and CN1901 on the
Main board assembly.
D
B
E
F
Fig. 1-4-1
(5) Take out 2 screws C , 1 screw D and 1 screw E as
shown in Fig. 1-4-1.
(6) Take out 1 screw F as shown in Fig. 1-4-1, and remove
the GR board assembly. (Take care not to pull the flat
wire (Fig. D8) from CN1902.)
(7) 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. (Refer to Fig. 1-4-2.)
(8) Remove the SW/Display board assembly and REC safety
board assembly. (Refer to page 1-3 of 1.3 DISASSEM-
BLY/ASSEMBLY METHOD. Take care not to pull the flat
wire (Fig. D7) from CN7001.)
Fig. 1-4-2
CN3011
CN3012
REC SAFETY BOARD
ASSEMBLY
SW/DISPLAY BOARD ASSEMBLY
MAIN BOARD
ASSEMBLY
TO JOG
CN902
CN901
CN1901
CN7192
JACK BOARD
ASSEMBLY
GR BOARD ASSEMBLY
CN7191
Fig. 1-4-3
(9) Place the SW/Display board assembly, REC safety board
assembly, JACK board assembly and GR board assem-
bly on the front side and left side of the Mechanism and
Main board assemblies which was removed at the step
(7), then connect the flat wires into CN3011, CN1901,
CN901 and CN902 of the Main board assembly. (Refer
to Fig. 1-4-3.)
(10) 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.)

1-5
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 the Mechanism as-
semblies.
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.
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”(See Fig. 1-4-3).
(1) Insert a cassette halfway in the Cassette holder assem-
bly.
(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 (the status
shown in Fig.1-4-3).
Notes:
•When performing diagnostics of the tape playback or
the recording condition in the "SERVICE POSITION",
enter the desired mode before turning the set upside
down, and do not change the mode when performing
diagnostics while the set is placed upside down. If you
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) Disconnect VCR from AC.
(2) Connect TPGND and TP7001 (TEST) on the SW/Display
board assembly with a jump wire.
(3) Connect VCR to AC.
(4) Press the POWER button.
(5) With lock levers Åı on the left and right of the Cassette
holder assembly pulled toward the front, slide the holder
in the same direction as the cassette insertion direction.
(For the positions of lock levers Åı , refer to the “Pro-
cedures for Lowering the Cassette holder assembly”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.
want to switch the mode, turn the set to the normal po-
sition (the status shown in Fig.1-4-3).
•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.
(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.
Fig. 1-5-1
TP7001
(TEST)
GR board assembly
JACK board assembly
SW/DISPLAY board assembly
TPGND
CP4001
CP5302
CP5301
MAIN board assembly
3D DIGITAL/4M board assembly
S-SUB board assembly
DEMOD board assembly
NAVIGATION 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
CN901
CN1901
CN7192
CN7191
CN3011
CN3012
TO JOG
CN7001
REC SAFFTY
board assembly