JVC HR-S3800U User manual

SERVICE MANUAL
No. 82792
March 2000
HR-S3800U/S4800U
SPECIFICATIONS
VIDEO CASSETTE RECORDER
This service manual is made from all recycled paper.
COPYRIGHT © 2000 VICTOR COMPANY OF JAPAN, LTD.
T
V
C
H
+
T
V
V
O
L
–
T
V
C
H
–
T
V
V
O
L
+
TV
CANCEL
TIMER
START STOP DATE
PLAY
REW
REC
STOP
SHUTTLE
PLUS
PAUSE
FF
MENU
OK
CH
POWER
TV/VCR
C.RESET
DBS
DAILY(M-F)
AUX
WEEKLY
PROG
CHECK
PROG SP/EP SKIP SEARCH
DISPLAY
A. MONITOR
CABLE/
DBS
123
456
789
0
2
4
1
3
EXPRESSPROGRAMMING
MULTI BRAND
REMOTE CONTROL UNIT
MBRSET
A/B
VIDEO (MONO)L—AUDIO—RS-VIDEO
MENU
OK
CH
S-VHS ET
FF
REW
POWER
SP EP
VCR
REC PAUSESTOP/EJECT
PLAY
GENERAL
Power requirement : AC 120 V`, 60 Hz
Power consumption
Power on : 20 W
Power off : 2.5 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) : 400 x 94 x 281 mm
(15-3/4" x 3-3/4" x 11-1/8")
Weight : 3.4 kg (7.5 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 ohms, unbalanced
TIMER
Clock reference : Quartz
Program capacity :
1-year programmable timer/8 programs
Memory backup time : Approx. 3 min.
ACCESSORIES
Provided accessories
FOR HR-S4800U : Infrared remote control unit,
“AA” battery x 2,
Audio/video cable,
S-video cable (4-pin),
S-VHS ET labels,
Controller
FOR HR-S3800U : Infrared remote control unit,
“AA” battery x 2,
Audio/video cable,
S-video cable (4-pin),
S-VHS ET labels,
Specifications shown are for SP mode unless specified otherwise.
E. & O.E. Design and specifications subject to change without notice.

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 .............................................................. 3-2
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 .................................................................... 3-3
3.3.1 D/A level .......................................................................... 3-3
3.3.2 EE Y level ........................................................................ 3-3
3.3.3 REC color (colour) level ................................................... 3-3
3.3.4 PB Y level (S-VHS/VHS) ................................................... 3-4
3.3.5 Video EQ (Frequency response) ...................................... 3-4
3.3.6 AUTO PICTURE initial setting .......................................... 3-4
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 SCHEMATIC DIAGRAM ............................... 4-5
4.3 SYSTEM CONTROL SCHEMATIC DIAGRAM ...................... 4-7
4.4 SWITCHING REGULATOR SCHEMATIC DIAGRAM ............ 4-9
4.5 TUNER SCHEMATIC DIAGRAM ........................................ 4-11
4.6 DISPLAY, S JACK AND SHUTTLE SCHEMATIC DIAGRAMS .. 4-13
4.7 TERMINAL SCHEMATIC DIAGRAM .................................. 4-15
4.8 BS CONNECTION, C.BOX AND R.PAUSE SCHEMATIC
DIAGRAMS ........................................................................ 4-16
4.9 S-SUB AND SUB EMPHA SCHEMATIC DIAGRAMS ......... 4-17
4.10 2D DIGITAL SCHEMATIC DIAGRAM ............................... 4-19
4.11 DEMODULATOR SCHEMATIC DIAGRAM ...................... 4-21
4.12 MAIN, A/C HEAD, C.BOX, S JACK, R.PAUSE, SHUTTLE
AND LOADING MOTOR CIRCUIT BOARDS ................... 4-25
4.13 2D DIGITAL CIRCUIT BOARD ......................................... 4-28
4.14 SUB EMPHA CIRCUIT BOARD ....................................... 4-29
4.15 DEMODULATOR CIRCUIT BOARD ................................. 4-30
4.16 FDP GRID ASSIGNMENT AND ANODE CONNECTION .. 4-31
4.17 REMOTE CONTROL SCHEMATIC DIAGRAM ................. 4-32
4.18 VOLTAGE CHARTS .......................................................... 4-33
4.19 SYSTEM CONTROL BLOCK DIAGRAM .......................... 4-37
4.20 VIDEO BLOCK DIAGRAM ............................................... 4-39
4.21 AUDIO BLOCK DIAGRAM ............................................... 4-43
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
2D DIGITAL BOARD ASSEMBLY <05> .................................. 5-12
R.PAUSE BOARD ASSEMBLY <06> ....................................... 5-13
SUB EMPHA BOARD ASSEMBLY <08>................................. 5-13
AUDIO CONTROL HEAD BOARD ASSEMBLY <12> ............. 5-13
DEMOD BOARD ASSEMBLY <14> ........................................ 5-13
S JACK BOARD ASSEMBLY(S4800U/U(C)) <36> ................... 5-14
LOADING MOTOR BOARD ASSEMBLY <55> ....................... 5-14
SHUTTLE BOARD ASSEMBLY <85> ...................................... 5-14
C.BOX BOARD ASSEMBLY <92> ........................................... 5-14
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) ................................ 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 .......................... 2-3
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 .............. 2-7
2.2.3 Cassette Holder Assembly .............................................. 2-7
2.2.4 Pinch Roller Arm Assembly ........................................... 2-10
2.2.5 Guide Arm Assembly and Press Lever Assembly ......... 2-10
2.2.6 Audio Control Head ....................................................... 2-10
2.2.7 Loading Motor ............................................................... 2-11
2.2.8 Capstan Motor ............................................................... 2-11
2.2.9 Pole Base Assembly (supply or take-up side) ................ 2-12
2.2.10 Rotary Encoder ........................................................... 2-12
2.2.11 Clutch Unit .................................................................. 2-13
2.2.12 Change Lever Assembly, Direct Gear and Clutch Gear1. 2-13
2.2.13 Link Lever ................................................................... 2-13
2.2.14 Cassette Gear, Control Cam and Worm Gear ............. 2-14
2.2.15 Control Plate ............................................................... 2-14
2.2.16 Loading Arm Gear (supply or take-up side) and
Loading Arm Gear Shaft ............................................. 2-15
2.2.17 Take-up Lever, Take-up Head and Control Plate Guide 2-16
2.2.18 Capstan Brake Assembly ............................................ 2-16
2.2.19 Sub Brake Assembly (take-up side) ............................ 2-17
2.2.20 Main Brake Assembly (take-up side), Reel Disk (take-up
side) and Main Brake Assembly (supply side) .................. 2-17
2.2.21 Tension Brake Assembly, Reel Disk (supply side) and
Tension Arm Assembly ............................................... 2-17
2.2.22 Idler Lever, Idler Arm Assembly ................................. 2-18
2.2.23 Stator Assembly ......................................................... 2-18
2.2.24 Rotor Assembly .......................................................... 2-18
2.2.25 Upper Drum Assembly ............................................... 2-19
2.3 COMPATIBILITY ADJUSTMENT ........................................ 2-20
2.3.1 Checking/Adjustment of FM Waveform Linearity ......... 2-20
2.3.2 Checking/Adjustment of the Height and Tilt of the
Audio Control Head ....................................................... 2-21
2.3.3 Checking/Adjustment of the Audio Control Head Phase (X-Value) . 2-21
2.3.4 Checking/Adjustment of the Standard Tracking Preset . 2-22
2.3.5 Checking/Adjustment of the Tension Pole Position ....... 2-22
3. ELECTRICAL ADJUSTMENT
3.1 PRECAUTION ...................................................................... 3-1
HR-S3800U/U(C) HR-S4800U/U(C)
FLYING ERASE HEAD NOT USED USED
INSERT EDIT NOT USED USED
AUDIO DUBBING NOT USED USED
FRONT S-VIDEO INPUT TERMINAL NOT USED USED
CABLE MOUSE OPTION PROVIDEO
The following table lists the differing points between Models ( HR-S3800U/U(C) and HR-S4800U(C) ) in this series.
TABLE OF CONTENTS
Section Title Page Section Title Page

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
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 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.
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.
2S40888-01
d'
d
Chassis
Power cord,
primary wire
ab
c
V
A
Externally
exposed
accessible
p
art
Z
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
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)
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

1-2
Fig. D2 Fig. D4
Fig. D1
Fig. D3
(S1)
1
(S1)
(S1)
(S2)
(L3)
(L3)
<NOTE 3a>
WR3a
<NOTE 3b>
(L3)
CN7001
FOIL SIDE
<NOTE 3c>
CN7108
(S3)
S JACK
board assembly
WR3b
SUPPORTING
TAPE SIDE
<NOTE 3c>
FRONT PANEL
BACK SIDE
(S4a)
WR4b
WR4a
4
CN1
ac
CN1
b
FOIL SIDE
<NOTE 3c>
FOIL SIDE
<NOTE 3c>
DRUM SHIELD
(S4b)
(S4a)
(L4a)
(L4b)
(P4)
ROLLER ARM
ASSEMBLY
INERTIA PLATE
NOTE: When installing the DRUM assembly, secure the
screws (S4a) in the order of a, b, c.

1-3
Fig. D5 Fig. D6
(S5b)
(S5c)
Q3002
(L5)
Q3001
D3001
LED
(L5)
5
ba
Spacer
<NOTE 5b>
Spacer
<NOTE 5b>
End sensor
<NOTE 5c>
Start sensor
<NOTE 5c>
<NOTE 5c>
WR5
FOIL SIDE
<NOTE 3c>
CN1
(S5a)
<NOTE 5a>
S3002
S cassette switch
<NOTE 5c>
(L6)
(S6)
CN7001
6
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 unscrewed when removing the
Mechanism assembly.
Fig. 2
Fig. 3
Fig. 1
NOTE: When installing the Mechanism assembly, secure
the screws (S5a) in the order of a, b.

1-4
(6) Connect the power cord to the wall socket, and lift the
cassette holder.
(Before turning on the power make sure that there is
nothing which may produce a short circuit, such as faulty
soldering.)
(7) 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.
NOTES: •
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 playback picture or the FDP
counter display may move even when the
mechanism is kept in an inoperative status.
• When performing diagnostics of the tape play-
back or recording condition in the “SERVICE
POSITION”, enter the desired mode before
turning the set upside down, and do not
change the mode during diagnostics while the
set is placed upside down. If you want to
switch the mode, turn the set to the normal
position.
Fig. 1-4-2
Fig. 1-4-1
(5) 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.)
D
C
JACK board
assembly
CN7108
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 S JACK board assembly. (Do not remove the flat wire
(WR3b) from CN7108 on the S JACK board assembly.)
(See 1.3 DISASSEMBLY/ASSEMBLY METHOD.)
(2) Lower the cassette holder, and make the preparations
required in order to remove the screws from the Mecha-
nism assembly. (Refer to the “Procedures for Lowering
the Cassette holder assembly” on pages 1-3 of 1.3 DIS-
ASSEMBLY/ASSEMBLY METHOD.)
(3) Remove the Roller arm assembly and Drum shield. (See
Fig. D4 of 1.3 DISASSEMBLY/ASSEMBLY METHOD.)
(4) Take out 2 screws A , 1 screw B , 1 screw C and 1
screw D as shown in Fig. 1-4-1.

1-5
Fig. 1-5-1
Fig. 1-4-3
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.
(3) Connect VCR to AC.
(4) Press the POWER button.
(5) With lock levers 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 , refer to
the “Procedures for Lowering the Cassette holder as-
sembly”on pages 1-3 of 1.3 DISASSEMBLY/ASSEMBLY
METHOD.)
(6) The cassette holder lowers and, when the loading has
completed, the mechanism enters the desired mode.
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".
MAIN BOARD ASSEMBLY <03>
TP7001
TEST
TPGND
CP4001
CP5302
TP106
PB.FM
TP2253
A.PB.FM
TP4001
CTL.P
VR1201
D/A LEVEL
TP111
D.FF
MAIN board
assembly
SUB EMPH
board assembly
S JACK board assembly
2D DIGITAL
board assembly
DEMODULATOR
board assembly

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 emergency 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 emergency 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 : Normal display
E :
**
:** Emergency content display
(E:Latest:Previous)
*
1:
*
2: 34 Emergency detail display
1
*
5:
*
6:* 7 Emergency detail display
2
Fig. 1-6-1 Jig RCU
NOTE: • For the emergency content, see “1.6.3
Emergency content description”.
(2) Transmit the code “59”from the Jig RCU again.
The FDP shows the emergency detail information 1in
the form of “*1: *2: 34”.
*1: Deck operation mode at the moment of emer-
gency
*2: Mechanism operation mode at the moment of
emergency
3 –: Mechanism sensor information at the moment of
emergency
–4: Mechanism mode position at the moment of
emergency
NOTE: • For the emergency detail information
1
, see
“1.6.4 Emergency detail information
1
”.
(3) Transmit the code “59”from the Jig RCU once again.
The FDP shows the emergency detail information 2in
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 Emergency detail information
2
”.
(4) Transmit the code “59”from the Jig RCU once again to
reset 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
[Data transmitting method]
Depress the “”( 3 ) button
after the data code is set.
CUSTOM CODE
43: A CODE
53: B CODE
Jig RCU
[PTU94023B]
(Y292-MN03e)

1-7
When the mechanism mode cannot be changed to an-
other mode even when the loading motor has rotated
for more than 4 seconds in the loading direction, [E:01]
is identified and the power is turned off.
When the mechanism mode cannot be changed to an-
other mode even when the loading motor has rotated
for more than 4 seconds in the unloading direction, [E:02]
is identified and the power is turned off.
When the take-up reel pulse has not been generated for
more than 4 seconds in the capstan rotating mode,
[E:03] is identified, the pinch rollers are turned off and
stopped, and the power is turned off. However, the reel
EMG is not detected in STILL/SLOW modes.
When the drum FG pulse has not been input for more
than 3 seconds in the drum rotating mode, [E:04] is iden-
tified, the pinch rollers are turned off and stopped, and
the power is turned off.
When the eject operation does not complete in 3 sec-
onds after the start, [E:05] is identified, the pinch roll-
ers are turned off and stopped, and the power is turned
off.
When the cassette insertion operation does not com-
plete in 3 seconds after the start, the cassette is ejected.
In addition, when the operation does not complete
within 3 seconds after the start, [E:05] is also identified
and the power is turned off immediately.
When the capstan FG pulse has not been generated for
more than 1 second in the capstan rotating mode, [E:06]
is identified, the pinch rollers are turned off and stopped,
and the power is turned off.However, the capstan EMG
is not detected in STILL/SLOW/FF/REW modes.
When short-circuiting of the SW power supply with GND
has lasted for 0.5 second or more, [E:07] is identified,
all the motors are stopped and the power is turned off.
When DD tilting does not complete in 4 seconds, [E:08]
is identified, the tilt motor is stopped and the power is
turned off.
When the DD FG pulse is not generated within 2.5 sec-
onds, [E:09] is identified, the tilt motor is stopped and
the power is turned off.
When the supply reel pulse has not been generated for
more than 10 seconds in the capstan rotating mode,
[E:0A] is identified and the cassette is ejected (but the
power is not turned off). However, note that the reel
EMG is not detected in the SLOW/STILL mode.
1
The mechanism is locked in the middle of mode transition.
2 The mechanism is locked at the loading end due to the encoder position
reading error during mode transition.
3 Power is not supplied to the loading MDA.
1 The mechanism is locked in the middle of mode transition.
2 The mechanism is locked at the unloading end due to the encoder posi-
tion reading error during mode transition.
3 Power is not supplied to the loading MDA.
1 The take-up reel pulse is not generated in the FWD transport modes (PLAY/
FWD SEARCH/FF, etc.) because;
1) The idler gear is not meshed with the take-up reel gear;
2)
The idler gear is meshed with the take-up reel gear, but incapable of wind-
ing due to too large mechanical load (abnormal tension);
3) The take-up reel sensor does not output the FG pulse.
2 The supply reel pulse is not generated in the REV transport modes (REV
SEARCH/REW, etc.) because;
1) The idler gear is not meshed with the supply reel gear.
2) The idler gear is meshed with the supply reel gear, but incapable of
winding due to too large a mechanical load (abnormal tension);
3) The supply reel sensor does not output the FG pulse.
3 Power is not supplied to the reel sensors.
1 The drum could not start or the drum rotation has stopped due to too large
a load on the tape, because;
1) The tape tension is abnormally high;
2)
The tape is damaged or a foreign object (grease, etc.) adheres to the tape.
2 The drum FG pulse did not reach the System controller CPU because;
1) The signal circuit is disconnected in the middle;
2) The FG pulse generator (hall device) of the drum is faulty.
3 The drum control voltage (DRUM CTL V) is not supplied to the MDA.
4 Power is not supplied to the drum MDA.
1 The cassette cannot be ejected due to a failure in the drive mechanism of
the housing.
2 When the housing load increases during ejection, the loading motor is
stopped because of lack of headroom in its drive torque.
Housing load increasing factors: Temperature environment (low tempera-
ture, etc.), mechanism wear or failure.
3 The sensor/switch for detecting the end of ejection are not functioning normally.
4 The loading motor drive voltage is lower than specified or power is not
supplied to the motor (MDA).
5 When the user attempted to eject a cassette, a foreign object (or perhaps
the user's hand) was caught in the opening of the housing.
1 The capstan could not start or the capstan rotation has stopped due to too
large a load on the tape, because;
1) The tape tension is abnormally high (mechanical lock);
2) The tape is damaged or a foreign object (grease, etc.) is adhered to the
tape (occurrence of tape entangling, etc.).
2 The capstan FG pulse did not reach the System controller CPU because;
1) The signal circuit is disconnected in the middle;
2) The FG pulse generator (MR device) of the capstans is faulty.
3 The capstan control voltage (CAPSTAN CTL V) is not supplied to the MDA.
4 Power is not supplied to the capstan MDA.
1 The SW 5 V power supply circuit is shorted with GND.
2 The SW 12 V power supply circuit is shorted with GND.
1The absolute value sensor is defective. (The soldered parts have separated.)
2The pull-up resistor at the absolute sensor output is defective. (The soldered parts
have separated.)
3Contact failure or soldering failure of the pins of the connector (board-to-board) to the
absolute value sensor.
4
The absolute value sensor data is not sent to the System Controller CPU.
1The FG sensor is defective. (The soldered parts have separated.)
2The pull-up resistor at the FG sensor output is defective. (The soldered parts have
separated.)
3Contact failure or soldering failure of the pins of the connector (board-to-board) to the FG sensor.
4The power to the sensor is not supplied. (Connection failure/soldering failure)
5The FG pulse is not sent to the System Controller CPU.
6
The tilt motor is defective. (The soldered parts have separated.)
7The drive power to the tilt motor is not supplied. (Connection failure/soldering failure)
8The tilt motor drive MDA - IC is defective.
9Auto-recovery of the DD tilting cannot take place due to overrun.
1 The supply reel pulse is not generated in the FWD transport mode (PLAY/
FWD SEARCH/FF, etc.) because;
1) PLAY/FWD or SEARCH/FF is started while the tape in the inserted cas-
sette is cut in the middle;
2) A mechanical factor caused tape slack inside and outside the supply
reel side of the cassette shell. In this case, the supply reel will not ro-
tate until the tape slack is removed by the FWD transport, so the pulse
is not generated until then;
3) The FG pulse output from the supply reel sensor is absent.
2 The take-up reel pulse is not generated in the REV transport mode (REV
SEARCH/REW, etc.).
1) REV SEARCH/REW is started when the tape in the inserted cassette
has been cut in the middle;
2) A mechanical factor caused tape slack inside and outside the take-up
reel side of the cassette shell. In this case, the supply reel will not ro-
tate until the tape slack is removed by the REV transport, so the pulse
will not be generated until that time;
3) The FG pulse output from the take-up reel sensor is absent.
3 The power to a reel sensor is not supplied.
1.6.3 Emergency content description
NOTE:
Emergency contents “E08/E09”are for the model with Dynamic Drum (DD).
FDP CONTENT CAUSE
Presupposing the presence of the control pulse output in the PLAY mode, when the value obtained by mixing the two V.FM output
channels (without regard to the A.FM output) has remained below a certain threshold level for more than 10 seconds, [E:U1] is
identified and recorded in the emergency history. During the period in which a head clog is detected, the FDP and OSD repeat the
“3-second warning display”and “7-second noise picture display”alternately.
EMG code : “E:U1”/ FDP : “U:01”/ OSD : “Try cleaning tape.”
The head clog warning is reset when the above-mentioned threshold has been exceeded for more than 2 seconds or the mode is
changed to another mode than PLAY.
EU1:Head clog
warning
E0A:Supply Reel
Pulse EMG
E07: SW Power
Short-Circuit
EMG
E06: Capstan FG
EMG
E05: Cassette Eject
EMG
E04: Drum FG
EMG
E03: Take Up Reel
Pulse EMG
E02:
Unloading EMG
E01: Loading EMG
Table 1-6-1
E08: DD Initialized
(Absolute
Position
Sensor) EMG
E09: DD FG EMG

1-8
1.6.4 Emergency detail information 1
The status (electrical operation mode) of the VCR and the
status (mechanism operation mode/sensor information) of
the mechanism in the latest emergency can be confirmed
based on the figure in EMG detail information 1.
*1 : Deck Operation Mode
Display Deck Operation Mode
00 Mechanism being initialized
01 STOP with pinch roller pressure off (or tape present with P.OFF)
02 STOP with pinch roller pressure on
03 POWER OFF as a result of EMG
04 PLAY
0C REC
10 Cassette ejected
20 FF
21 Tape fully loaded, START sensor ON, short FF
22 Cassette identification FWD SEARCH before transition to
FF (SP x7-speed)
24 FWD SEARCH (variable speed) including x2-speed
2C INSERT REC
40 REW
42 Cassette identification REV SEARCH before transition to
REW (SP x7-speed)
44 REV SEARCH (variable speed)
4C AUDIO DUB
6C INSERT REC (VIDEO + AUDIO)
84 FWD STILL/SLOW
85 REV STILL/SLOW
8C REC PAUSE
8D Back spacing
8E Forward spacing (FWD transport mode with BEST function)
AC INSERT REC PAUSE
AD INSERT REC Back spacing
CC AUDIO DUB PAUSE
CD AUDIO DUB Back spacing
EC INSERT REC (VIDEO + AUDIO) PAUSE
ED INSERT REC (VIDEO + AUDIO) Back spacing
3 – : Mechanism Sensor Information
Display
Mechanism Sensor Information
S-VHS SW REC SAFETY SW START SENSOR END SENSOR
0–VHS Tab broken ON ON
1–VHS Tab broken ON OFF
2–VHS Tab broken OFF ON
3–VHS Tab broken OFF OFF
4–VHS Tab present ON ON
5–VHS Tab present ON OFF
6–VHS Tab present OFF ON
7–VHS Tab present OFF OFF
8–S-VHS Tab broken ON ON
9–S-VHS Tab broken ON OFF
A–S-VHS Tab broken OFF ON
B–S-VHS Tab broken OFF OFF
C–S-VHS Tab present ON ON
D–S-VHS Tab present ON OFF
E–S-VHS Tab present OFF ON
F–S-VHS Tab present OFF OFF
*2 : Mechanism Operation Mode
Display Mechanism Operation Mode
00 Command standby (Status without executing command)
02 POWER OFF by EMG occurrence
04 Moving to the adjacent position in the LOAD direction
06 Moving to the adjacent position in the UNLOAD direction
08 Cassette ejection being executed
0A Cassette insertion being executed
0C Tape being loaded
0E Tape being unloaded
10 Mode transition to STOP with pinch roller compression ON
12 Mode transition to STOP with pinch roller compression OFF
14 Mode transition to STOP with pinch roller compression
OFF as a result of POWER OFF
16 Mode transition to STOP with pinch roller compression ON
as a result of POWER ON
18 Mode transition to PLAY
1A Mode transition to FWD SEARCH
1C Mode transition to REC
1E Mode transition to FWD STILL/SLOW
20 Mode transition to REV STILL/SLOW
22 Mode transition to REV SEARCH
24 Mode transition from FF/REW to STOP
26 Mode transition to FF
28 Mode transition to REW
2A 4 sec. of REV as a result of END sensor going ON during
loading
2C Short FF/REV as a result of tape sensor going ON during
unloading
2E Mechanism position being corrected due to overrun
80 Mechanism in initial position (Dummy command)
–4 : Mechanism Mode Position
Display Mechanism Mode Position
-0 Initial value
-1 EJECT position
-2 Housing operating
-3 U/L STOP position
-4 Tape being loaded/unloaded (When the pole base is located
on the front side of the position just beside the drum)
-5 Tape being loaded/unloaded (When the pole base is located
on the rear side of the position just beside the drum)
-6 Pole base compressed position
-7 FF/REW position
-8 Between FF/REW and STOP with pinch roller compression ON
-9 STOP with pinch roller compression OFF
-A Between STOP with pinch roller compression OFF and REV
-B REV (REV STILL/SLOW) position
-C Between REV and FWD
-D FWD (FWD STILL/SLOW) position
-E Between FWD and PLAY
-F PLAY position
[FDP display]
*1: *2: 34
*1: Deck operation mode at the moment of emer-
gency
*2: Mechanism operation mode at the moment of
emergency
3 –: Mechanism sensor information at the moment
of emergency
–4: Mechanism mode position at the moment of
emergency

1-9
*5 : Cassette tape type 1
Display Cassette Tape Type 1
00 Cassette type not identified
16 Large reel/small reel (T-0 to T-15/T-130 to T-210)
not classified
82 Small reel, thick tape (T-120) identified
/thin tape (T-140) identified
84 Large reel (T-0 to T-60) identified
92 Small reel, thick tape (T-130) identified
/thin tape (T-160 to T-210) identified
93 Small reel, thick tape/C cassette
(T-0 to T-100/C cassette) not classified
C3 Small reel, thick tape/C cassette
(T-0 to T-100/C cassette) being classified
D3 Small reel, thick tape/C cassette
(T-0 to T-100/C cassette) being classified
E1 C cassette, thick tape (TC-10 to TC-20)
identified
E2 Small reel, thick tape (T-0 to T-100)
identified
E9 C cassette, thin tape (TC-30 to TC-40)
identified
F1 C cassette, thick tape/thin tape (TC-10 to TC-40)
not classified
1.6.5 Emergency detail information 2
The type of the cassette tape and the cassette tape wind-
ing position can be confirmed based on the figure in EMG
detail information 2.
[FDP display]
*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: • EMG detail information
2
is the reference in-
formation stored using the remaining tape de-
tection function of the cassette tape. As a re-
sult, it may not identify cassette correctly when
a special cassette tape is used or when the tape
has variable thickness.
NOTES: • Cassette tape type
1
is identified a few times
during mode transition and the identification
count is variable depending on the cassette
tape type. If an EMG occurs in the middle of
identification, the cassette tape type may not
be able to be identified.
• If other value than those listed in the above ta-
ble is displayed, the cassette tape type is not
identified.
*7 : Cassette tape type 2(Winding area)
Display Cassette Tape Type 2
00 Cassette type not identified
07 Small reel, thick tape T-5
08 - 0E C cassette, thick tape TC-10
09 - 15 C cassette, thick tape TC-20P
0A - 0B Small reel, thick tape T-20
0A - 16 C cassette, thin tape TC-30
0A - 16 C cassette, thin tape TC-40
0D - 0F Small reel, thick tape T-40
11 - 14 Small reel, thick tape T-60
15 - 18 Small reel, thick tape T-80/DF-160
17 - 1A Small reel, thick tape T-80/DF-180
19 - 1D Small reel, thick tape T-100
1D - 21 Small reel, thick tape T-120/DF-240
1E - 1F Small reel, thin tape T-140
1F - 23 Small reel, thick tape T-130
21 - 23 Small reel, thin tape T-160
21 - 23 Small reel, thin tape T-168
22 - 24 Small reel, thick tape DF-300
22 - 24 Small reel, thin tape T-180/DF-380
22 - 24 Small reel, thin tape T-210/DF-420
22 - 23 Large reel T-5
23 - 24 Large reel T-10
25 - 26 Large reel T-20
27 - 29 Large reel T-30
29 - 2B Large reel T-40
2D - 2F Large reel T-60
NOTE: • The values of cassette tape type
2
in the above
table are typical values with representative cas-
sette tapes.
*6 : Cassette tape winding position
The cassette tape winding position at the moment of EMG
is displayed by dividing the entire tape (from the beginning
to the end) in 22 sections using a hex number from "00" to
“15”.
“00”: End of winding
“15”: Beginning of winding
“FF”: Tape position not identified

1-10
1.7 SYSCON CIRCUIT
1.7.1 Syscon CPU pin function (IC3001)
PIN NO. LABEL IN/OUT FUNCTION
1 SP_FG IN DETECTION SIGNAL FOR SUPPLY REEL ROTATION/TAPE REMAIN
2 TU_FG IN DETECTION SIGNAL FOR TAKE-UP REEL ROTATION/TAPE REMAIN
3 PAUSE/COMPU_IN IN REMOTE PAUSE INPUT/NC
4 BS_ANT_ON(H) - NC
5 RC IN REMOTE CONTROL DATA INPUT
6 OPE_SW - NC
7 TU_CLK OUT CLOCK FOR DATA TRANSFER TO THE TUNER UNIT
8 TU_DATA OUT TUNING DATA
9 TU_CE OUT CHIP ENABLE OF THE TUNER UNIT
10 LMC1 OUT LOADING MOTOR DRIVE (1)
11 LMC2 OUT LOADING MOTOR DRIVE (2)
12 EP(H) - NC
13 RMO/R-Y_REV/PAL_ET_REC/JUST(L) OUT REMOTE CONTROL OUTPUT FOR CABLE BOX/NC/NC/NC
14 BIL_SEL - NC
15 CONV_CTL(H) OUT R/F CONVERTER ON/OFF (ON:H, OFF:L)
16 CTL_GAIN OUT CONTROL AMP OUT FREQUENCY RESPONSE SWITCHING
17 I2C_DATA_A/V IN/OUT I/O DATA
18 I2C_CLK_A/V OUT SERIAL DATA TRANSFER CLOCK
19 SP_SHORT(H)/FLY_ON(H) OUT MODE SELECT/REC TIMING CONTROL (FLY ERASE ON:H) [HR-S4800U/U(C)]
20 EP_SHORT(H)/FLY_REC_ST(H) OUT MODE SELECT/FLY REC START:H [HR-S4800U/U(C)]
21 SB_GAIN OUT VOLTAGE CONTROL SIGNAL FOR VIDEO FREQUENCY RESPONSE
22 CAP_REV(L) OUT CAPSTAN MOTOR REVERSE CONTROL (FWD:H/REV:L)
23 D.FF OUT ROTATION DETECTION SIGNAL FOR DRUM MOTOR/TIMING CONTROL SIGNAL FOR REC
24 V.PULSE OUT V.PULSE ADDITION TIMING CONTROL
25 RESET - RESET TERMINAL (RESET ON:L)
26 A.FF OUT AUDIO FF OUTPUT
27 N.REC_ST(H) OUT NORMAL AUDIO SOUND RECORDING START
28 S.CASSETTE IN DETECTION SIGNAL FOR SVHS CASSETTE (SVHS:H)
29 SLOW_PULSE OUT RECEIVING TIMING OUTPUT OF SPECIAL PLAYBACK PICTURE
30 H.REC_ST(H) OUT HIFI AUDIO SOUND RECORDING START
31 TU_MUTE(H) OUT TUNER AUDIO MUTE CONTROL (MUTE:H)
32 CNR(H)/VPCTL - NC
33 CAP_CTL_V OUT CAPSTAN MOTOR CONTROL
34 DRUM_CTL_V OUT DRUM MOTOR CONTROL
35 A.MUTE(H) OUT AUDIO MUTE CONTROL (MUTE:H)
36 VDD - SYSTEM POWER
37 X OUT - MAIN SYSTEM CLOCK (14.32MHz)
38 X IN - MAIN SYSTEM CLOCK (14.32MHz)
39 VSS - GND
40 XC IN - TIMER CLOCK (32.768kHz)
41 XC OUT - TIMER CLOCK (32.768kHz)
42 CLK SEL IN SELECT FOR BACKUP METHOD (LITHIUM OR E.CAP):H
43 P.MUTE(L) OUT PICTURE MUTE CONTROL (MUTE:L)
44 V_UP(H) - NC
45 V.REF - NC
46 P.CTL(H) OUT CONTROL SIGNAL FOR SWITCHING POWER SUPPLY
47 VIDEO_OUT OUT COMPOSITE VIDEO SIGNAL OUTPUT
48 VSS2 - GND
49 CVIN IN COMPOSITE VIDEO SIGNAL INPUT
50 SYN_IN IN
COMPOSITE SYNCHRONIZING SIGNAL FOR SERVO, VERTICAL SYNCHRONIZING SIGNAL FOR OSD

1-11
PIN NO. LABEL IN/OUT FUNCTION
51 VDD2 - SYSTEM POWER
52 AFCC IN FILTER INPUT FOR HORIZONTAL SYNCHRONIZING OF OSD CHARACTER
53 AFCLPF OUT FILTER INPUT FOR HORIZONTAL SYNCHRONIZING OF OSD CHARACTER
54 FSCI/BIT_IN(H) - NC
55 FSCLPF/BS_P.CTL - NC
56 I2C_DATA IN/OUT I/O DATA FOR MEMORY IC
57 I2C_CLK/TEST OUT SERIAL DATA TRANSFER CLOCK FOR MEMORY IC
58 CHARAE OUT OSD CHARACTER DATA (FRINGE) OUTPUT
59 LMC3 OUT LOADING MOTOR DRIVE(3)
60 CHARAM OUT OSD CHARACTER DATA OUTPUT
61 LSA IN MECHANISM MODE DETECT(A)
62 LSB IN MECHANISM MODE DETECT(B)
63 LSC IN MECHANISM MODE DETECT(C)
64 S.DET IN DETECTION SIGNAL FOR S-VHS MODE (S-VHS PB:H)
65 D.FG_IN IN DRUM FG PULSE INPUT
66 D.PG_IN IN DRUM PICKUP PULSE INPUT(SWITCHING PULSE)
67 C.FG_AMP_OUT OUT SET-UP OUTPUT FOR CAPSTAN FG AMPLIFICATION FACTOR
68 C.FG_IN IN CAPSTAN FG PULSE INPUT
69 AMP_VREF_OUT OUT AMP CIRCUIT REFERENCE VOLTAGE OUTPUT
70 AMP_VREF_IN IN AMP CIRCUIT REFERENCE VOLTAGE INPUT
71 AVSS - GND
72 AMP_C IN CAPACITOR CONNECT TERMINAL FOR CTL AMP CIRCUIT
73 AVCC - SYSTEM POWER
74 CTL_+ IN/OUT CTL(+) SIGNAL
75 CTL_- IN/OUT CTL(-) SIGNAL
76 CTL_AMP_OUT OUT CTL PULSE OUTPUT
77 LOCK(L) IN TUNING PLL LOCK DETECT:L
78 BS_ANT/KILLER_OUT - NC
79 START_SENSOR IN START SENSOR
80 FULLE.ON(H)/3.58NTSC(H)/GR_ON(H) OUT FULL ERASE HEAD ON:H/NC/NC
81 REC_SAFETY IN REC SAFETY SWITCH DETECT (SW ON:L)
82 COMPU_OUT/WIDE_DET OUT A/V COMPULINK OUTPUT/NC
83 VIDEO_ENV IN AUTO TRACKING DETECT/INPUT THE AVERAGE OF PLAYBACK VIDEO SIGNAL
84 A_ENV/ND(L) IN AUDIO PB FM ENV.INPUT/NON HiFi MODE: L
85 END_SENSOR IN END SENSOR
86 AFC/JUST_CLK IN TUNING CHECK/NC
87 LED - NC
88 IND(L) - NC
89 IND(R) - NC
90 POWER_DET IN DETECTION SIGNAL FOR POWER DOWN OF AC POWER SUPPLY
91 P.SAVE(L) - NC
92 N.REC(H) OUT NORMAL AUDIO REC MODE CONTROL (REC:H)
93 FH625(L)/TRICK(H) - NC
94 PROTECT IN DETECTION SIGNAL FOR SW. POWER SUPPLY
95 STB OUT STROBE (FOR FDP DRIVER)
96 S.CLK OUT SERIAL DATA TRANSMISSION CLOCK FROM THE FDP DRIVER TO THE ON-SCREEN IC
97 S_DATA_FRSYS OUT SERIAL DATA TRANSFER OUTPUT FROM THE FDP DRIVER TO THE ON-SCREEN IC
98 S_DATA_TOSYS IN SERIAL DATA TRANSFER OUTPUT FROM THE ON-SCREEN IC TO THE FDP DRIVER
99 JSA IN INPUT FOR THE JOG SHUTTLE
100 JSB IN INPUT FOR THE JOG SHUTTLE

2-1
SECTION 2
MECHANISM ADJUSTMENT
2.1 BEFORE STARTING REPAIR AND ADJUSTMENT
2.1.1 Precautions
(1) Unplug the power cable of the main unit before using
your soldering iron.
(2) Take care not to cause any damage to the conductor
wires when plugging and unplugging the connectors.
(3) Do not randomly handle the parts without identifying
where the trouble is.
(4) Exercise enough care not to damage the lugs, etc. dur-
ing the repair work.
(5) When installing the front panel assembly, be sure to hook
the lug on the back side of the cassette door to the door
opener of the cassette holder. If this operation is ne-
glected it will not be possible to remove the cassette
when ejecting because the housing door cannot be
opened.
2.1.2 Checking for Proper Mechanical Operations
Enter the mechanism service mode when you want to op-
erate the mechanism when no cassette is loaded. (See 1.5
MECHANISM SERVICE MODE.)
2.1.3 Manually Removing the Cassette Tape
1. In case of electrical failures
If you cannot remove the cassette tape which is loaded be-
cause of any electrical failure, manually remove it by taking
the following steps.
(1) Unplug the power cable and remove the top cover,
bracket and front panel assembly. (See 1.3 DISASSEM-
BLY/ASSEMBLY METHOD.)
(2) Unload the cassette by manually turning the loading mo-
tor of the mechanism assembly toward the front. In do-
ing so, hold the tape by the hand to keep the slack away
from any grease. (See Fig.2-1-1.)
(3) Bring the pole base assembly (supply or take-up side) to
a pause when it reaches the position where it is hidden
behind the cassette tape.
(4) Move the top guide toward the drum while holding down
the lug A of the bracket retaining the top guide. Like-
wise hold part B down and remove the top guide.
Section C of the top guide is then brought under the
cassette lid. Then remove the top guide by pressing the
whole cassette tape down. (See Fig.2-1-2.)
(5) Remove the cassette tape by holding both the slackened
tape and the cassette lid.
(6) Take up the slack of the tape into the cassette. This com-
pletes removal of the cassette tape.
Fig. 2-1-2
Fig. 2-1-1
Loading motor
Pole base assembly
Press
C
A
B

2-2
2. In case of mechanical failure
If you cannot remove the cassette tape which is loaded be-
cause of any mechanical failure, manually remove it by tak-
ing the following steps.
(1) Unplug the power cable and remove the top cover, front
panel assembly and others so that the mechanism as-
sembly is visible. (See 1.3 DISASSEMBLY/ASSEMBLY
METHOD.)
(2) While keeping the tension arm assembly of the mecha-
nism assembly free from tension, pull the tape on the
pole base assembly (supply or take-up side) out of the
guide roller. (See Fig.2-1-3.)
(3) Take the spring of the pinch roller arm assembly off the
hook of the press lever assembly, and detach it from the
tape. (See Fig.2-1-4.)
(4) In the same way as in the electrical failure instructions in
2.1.3 (4), remove the top guide.
(5) Raise the cassette tape cover. By keeping it in that posi-
tion, draw out the cassette tape case from the cassette
holder and take out the tape.
(6) By hanging the pinch roller arm assembly spring back on
the hook, take up the slack of the tape into the cassette.
Fig. 2-1-4
Fig. 2-1-3
Pole base assembly (take-up side)
Pole base assembly
(supply side)
Tension arm assembly
Guide pole
g
uard
Pinch roller arm assembly
Press lever assembly
Take the spring off the hook,
and detach it from the tape.

2-3
2.1.4 Jigs and Tools Required for Adjustment
2.1.5 Maintenance and Inspection
1. Location of major mechanical parts
Alignment tape (SP) Alignment tape (EP) Back tension cassette gauge A/C head positioning tool
MHP MHP-L PUJ48076-2 PTU94010
Roller driver Jig RCU Torque gauge
PTU94002 PTU94023B PUJ48075-2
Fig. 2-1-5 Mechanism assembly top side
Stator assembly
UV catcher2 (supply side)
UV catcher2 (take-up side)
Drum assembly Head base
Audio control head
Loading motor
Guide pole guard
Pinch roller arm
assembly
Press lever
assembly
Lid guide
Guide arm
assembly
Reel disk
(take-up side)
Sub brake assembly
(take-up side)
Main brake assembly
(take-up side)
Idler arm assembly
Idler lever
Main brake assembly
(supply side)
Reel disk
(supply side)
Rec safety lever
Tension brake
assembly
Adjust pin
Tension arm
assembly
Pole base assembly
(supply side)
Full erase head
Pole base assembly (take-up side)
T1
T26
T25
T24
T23
T22
T2
T3 T5 T7
T8
T9
T10
T11
T12
T13
T14
T15
T16T18
T20
T17T19T21
T4 T6
Table 2-1-1 Jigs and tools required for adjustment

2-4
Fig. 2-1-6 Mechanism assembly bottom side
Belt (loading motor)
Capstan motor
Belt (capstan)
Capstan brake assembly
Loading arm gear (take-up side)
Loading arm gear (supply side)
Plate
(supply side)
Control plate
Worm gear
Control cam
Cassette gear
Rotary encoder
Change lever assembly Clutch unit
Take-up lever
Take-up head
Control
bracket1
Tension arm
bearing
B1
B22
B3 B5
B6
B7
B8
B9
B10
B12
B15
Rotary encoder guide
B16
B17
B18
Brake lever
B19
B20
B21
B14
B11
B4
B2
Direct gear
B13
Link lever
Guide rail Roller cam assembly
L2L1
Opener guide
Door
opener
Drive gear
Cassette housing bracket
Limit gear
Worm gear
Belt (loading motor)
Loading motor
R2
R3 R5
R4
R1
Fig. 2-1-7 Mechanism assembly left side Fig. 2-1-8 Mechanism assembly right side

2-5
Note:
This table shows the order in which parts are removed for replacement. To replace parts, remove them in the order of
1 to 18 as shown in the table. To install them, reverse the removal sequence.
The circled numbers (symbols and numbers) preceding the individual part names represent the numbers in the "Lo-
cation of major mechanical parts" table. Also, the "T", "B", and "T/B" on the right of each part name shows that the
particular part is removed from the front, from the back, and from both sides of the mechanism, respectively.
Symbols and numbers
Symbols and numbers Number of removal steps Guide rail Roller cam assembly Cassette housing bracket Opener guide Relay gear Cassette holder assembly Drive gear Drive arm Pinch roller arm assembly Guide arm assembly Press lever assembly UV catcher2 Rotary encoder Clutch unit Change lever assembly Direct gear Link lever Worm gear Control bracket1 Control plate Loading arm gear (supply side) Loading arm gear (take-up side) Take-up lever Sub brake assembly (take-up side) Main brake assembly (take-up side) Reel disk (take-up side) Tension brake assembly Tension arm assembly Idler lever Brake lever Front (T)/Back (B) of mechanism
(Reference items)
Replacement parts
Removal parts
L1
L1
L2
L2
R4
R1
R2
R5
R3
T9
T12
T11
T6
T7
B1
T17
T10
T14
T15
T19
T13
T22
T20
T24
B9
T18
T16
B19
B16
B7
B8
B5
B4
B3
B11
B10
T25
B15
B12
B14
B13
B17
B18
B20
B21
R4 R1 R3 T9 T12 T11 B15 B12 B14 B13 B17 B21 B7 B8 B5 B4 B11 T14 T15 T13 T22 T24 T18 B19
T1 T4
,
T1 T4
,
2.2.3 Guide rail T 1
2.2.3 Roller cam assembly T 1
2.2.3 Cassette housing bracket T 1
2.2.3 Opener guide T 2
2.2.3 Door opener T 3
2.2.3 Relay gear T 3
2.2.3 Limit gear T 3
2.2.3 Cassette holder assembly T 6
2.2.3 Drive gear T 4
2.2.3 Drive arm T 8
2.2.4 Pinch roller arm assembly T 1
2.2.5 Guide arm assembly T 1
2.2.5 Press lever assembly T 3
2.2.6 Audio control head T 1
2.2.7 Loading motor T 1
2.2.8 Capstan motor T/B 1
2.2.9 UV catcher2 T 1
2.2.9
Pole base assembly (take-up side) T/B 2
2.2.9 Pole base assembly (supply side) T/B 2
2.2.10 Rotary encoder B 1
2.2.11 Clutch unit B 1
2.2.12 Change lever assembly B 3
2.2.12 Direct gear B 4
2.2.12 Clutch gear1 B 5
2.2.13 Link lever B 1
2.2.14 Cassette gear B 2
2.2.14 Control cam B 2
2.2.14 Worm gear B 1
- Lid guide T/B 5
2.2.15 Control bracket1 B 1
2.2.15 Control plate B 6
2.2.16 Loading arm gear (supply side) B 7
2.2.16 Loading arm gear (take-up side) B 8
2.2.16 Loading arm gear shaft B 9
2.2.17 Take-up lever T/B 7
2.2.17 Take-up head T/B 8
2.2.17 Control plate guide T/B 8
2.2.18 Capstan brake assembly T/B 7
2.2.19
Sub brake assembly(take-up side) T/B 15
2.2.20
Main brake assembly(take-up side) T/B 16
2.2.20
Main brake assembly(supply side) T/B 9
2.2.20 Reel disk (take-up side) T/B 16
2.2.21 Tension brake assembly T/B 9
2.2.21 Reel disk (supply side) T/B 10
2.2.21 Tension arm assembly T/B 10
2.2.21 Tension arm bearing T/B 10
2.2.22 Idler lever T/B 17
2.2.22 Idler arm assembly T/B 18
- Brake lever T/B 18
- Rotary encoder guide T/B 19
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16
1 2 3 4 5 6 7 8 9
1 2 3 4 5 6 7 8 9
1 2 3 4 5 6 7 8 9
1 2 3 4 5 6 7 8
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15
1 2 3 4 5 6 7 8
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15
1 2 3 4
12
12
3
12
1
1
1
2
3
4
5 6
1 2 3 4 5 6
1 2 3 4 5 6
7
12
12
12
1
1
2
3
12 3
4 5
1 2 3 4 5
6 7
7
1 2 3 4 5 6
1 2 3 4 5 6
1 2 3 4 5 6 7
1 2 3 4 5 6
1 2 3 4 5
1 2 3 4
1
1
1
2
3 4
5
6
7
8
7
8 9 10 11 12 13 14

2-6
~1000H ~2000H
Upper drum assembly ¤R R
A/C head ¤R ¤R
Lower drum assembly
¤¤R
Pinch roller arm assembly ¤¤
Full erase head ¤¤
Tension arm assembly ¤¤
Capstan motor (Shaft) ¤¤
Guide arm assembly ¤¤
Capstan motor R
Capstan brake assembly R
Main brake assembly R
Belt (Capstan) RR
Belt (Loading motor) R
Loading motor R
Clutch unit R
Worm gear R
Control plate R
Brush ¤R ¤R
Tension brake assembly RR
Rotary encoder R
2. Cleaning
Regular cleaning of the transport system parts is desirable
but practically impossible. So make it a rule to carry out clean-
ing of the tape transport system whenever the machine is
serviced.
When the video head, tape guide and/or brush get soiled,
the playback picture may appear inferior or at worst disap-
pear, resulting in possible tape damage.
(1) When cleaning the upper drum (especially the video
head), soak a piece of closely woven cloth or Kimu-wipe
with alcohol and while holding the cloth onto the upper
drum by the fingers, turn the upper drum
counterclockwise.
Note:
Absolutely avoid sweeping the upper drum
vertically as this will cause damage to the
video head.
(2) To clean the parts of the tape transport system other than
the upper drum, use a piece of closely woven cloth or a
cotton swab soaked with alcohol.
(3) After cleaning, make sure that the cleaned parts are com-
pletely dry before using the video tape.
3. Lubrication
With no need for periodical lubrication, you have only to lu-
bricate new parts after replacement. If any oil or grease on
contact parts is soiled, wipe it off and newly lubricate the
parts.
(1) See the mechanism assembly and disassembly diagrams
for the lubricating or greasing spots. See Table 2-1-2 for
the types of oil or grease to be used.
Type Name Serial No. Symbols on the dis-
assembly diagrams
Grease Maltemp SH-P KYODO-SH-P AA
Oil Cosmohydro HV56 COSMO-HV56 BB
Table 2-1-2 Grease and oil used for the unit
4. Suggested servicing schedule for main components
The following table indicates the suggested period for such
service measures as cleaning,lubrication and replacement.
In practice, the indicated periods will vary widely according
to environmental and usage conditions.However, the indi-
cated components should be inspected when a set is
brought for service and the maintenance work performed if
necessary. Also note that rubber parts may deform in
time,even if the set is not used.
Operation Hours
System Parts Name
¤: Cleaning
R: Inspection or Replacement if necessary
Table 2-1-3
Other Drive Tape transport
2.2 REPLACEMENT OF MAJOR PARTS
2.2.1 Before Starting Disassembling (Phase matching
between mechanical parts)
The mechanism of this unit is closely linked with the rotary
encoder and system controller circuits.
Since the system controller detects the status of mechani-
cal operation in response to phases of the rotary encoder
(internal switch positions), the mechanism may not operate
properly unless such parts as the rotary encoder, control
plate, loading arm gear, control cam, cassette gear, limit gear,
relay gear and drive gear are installed in their correct posi-
tions.
Especially, this model is not provided with any cassette hous-
ing assembly, so that cassette loading and unloading must
be accomplished by operation of the cassette holder assem-
bly. The latter is in turn driven by such parts as the drive
gear, relay gear and limit gear. Exercise enough care, there-
fore, to have the phases of all this gear matching one an-
other.
(For information on phase matching of the mechanism, see
the instructions on how to install individual parts.)