JVC HR-VP690U User manual

SERVICE MANUAL
No. 82841
December 2000
HR-VP690U/VP790U
SPECIFICATIONS (The specifications shown pertain specifically to the model HR-VP790U)
VIDEO CASSETTE RECORDER
Printed in Japan This service manual is printed on 100% recycled paper.
COPYRIGHT © 2000 VICTOR COMPANY OF JAPAN, LTD.
HR-VP690U/VP790U No. 82841
JVC SERVICE & ENGINEERING COMPANY OF AMERICA
DIVISION OF JVC AMERICAS CORP.
Head office
East Coast
Midwest
West Coast
Atlanta
Hawaii
:
:
:
:
:
:
1700 Valley Road Wayne, New Jersey 07470-9976
10 New Maple Avenue Pine Brook, New Jersey 07058-9641
705 Enterprise Street Aurora, Illinois 60504-8149
5665 Corporate Avenue Cypress, California 90630-0024
1500 Lakes Parkway Lawrenceville, Georgia 30043-5857
2969 Mapunapuna Place Honolulu, Hawaii 96819-2040
[phone]
[phone]
[phone]
[phone]
[phone]
[phone]
JVC CANADA INC.
Head office
Montreal
Vancouver
:
:
:
21 Finchdene Square Scarborough, Ontario M1X 1A7
16800 Rte Trans-Canadienne, Kirkland, Quebec H9H 5G7
13040 Worster Court Richmond, B.C. V6V 2B3
[phone]
[phone]
[phone]
S40895-03
GENERAL
Power requirement : AC 120 V
` , 60 Hz
Power consumption
Power on : 18 W
Power off : 2.0 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 mm x 94 mm x 255 mm
(15-3/4" x 3-3/4" x 10-1/16")
Weight : 3.1 kg (6.8 lbs)
Format : 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 : 230 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)
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 for timer is not supported.
ACCESSORIES
Provided accessories : RF cable (F-type),
Infrared remote control unit,
“AA” battery x 2
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 set the “Service position” .................................... 1-4
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
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
TABLE OF CONTENTS
Section Title Page Section Title Page
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
3.2 Servo circuit .......................................................................... 3-2
3.2.1 Switching point ............................................................... 3-2
3.2.2 Slow tracking preset ....................................................... 3-2
3.3 Video circuit........................................................................... 3-2
3.3.1 Auto picture initial setting ................................................ 3-2
3.4 Demodulator circuit ............................................................... 3-2
3.4.1 Separation ...................................................................... 3-2
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 MAIN (FMA/DEMOD) SCHEMATIC DIAGRAM .................. 4-13
4.7 MAIN (FRONT) AND MINI FRONT SCHEMATIC DIAGRAMS . 4-15
4.8 MAIN (TERMINAL) SCHEMATIC DIAGRAM ...................... 4-17
4.9 ADV. JOG SCHEMATIC DIAGRAM [HR-VP790U] ............. 4-18
4.10 CONNECTION SCHEMATIC DIAGRAM ........................ 4-19
4.11 MAIN CIRCUIT BOARD .................................................. 4-21
4.12 REMOTE CONTROLLER SCHEMATIC DIAGRAM ....... 4-24
4.13 FDP GRID ASSIGNMENT AND ANODE CONNECTION 4-25
4.14 WAVEFORMS ................................................................. 4-26
4.15 VOLTAGE CHARTS ........................................................ 4-27
4.16 CPU PIN FUNCTION ...................................................... 4-28
4.17 SYSTEM CONTROL BLOCK DIAGRAM ........................ 4-29
4.18 VIDEO BLOCK DIAGRAM .............................................. 4-31
4.19 AUDIO BLOCK DIAGRAM .............................................. 4-33
5. PARTS LIST
5.1 PACKING AND ACCESSORY ASSEMBLY <M1> ............... 5-1
5.2 FINAL ASSEMBLY <M2> ..................................................... 5-2
5.3 MECHANISM ASSEMBLY <M4> ......................................... 5-4
5.4 ELECTRICAL PARTS LIST ................................................... 5-6
MAIN BOARD ASSEMBLY <03> ............................................... 5-6
A/C HEAD BOARD ASSEMBLY <12> ...................................... 5-11
MINI FRONT BOARD ASSEEMBLY(HR-VP690U/U(C))<28> .5-11
ADV.JOG BOARD ASSEEMBLY(HR-VP790U/U(C))<38> .......5-11
LOADING MOTOR BOARD ASSEMBLY <55> ........................5-11
C.BOX/R.PAUSE BOARD ASSEMBLY(HR-VP790U/U(C)<99> ... 5-11
The following table lists the differing points between Models (HR-VP690U/U(C) and HR-VP790U/U(C)) in this series.
HR-VP690U/U(C) HR-VP790U/U(C)
JOG/SHUTTLE NOT USED USED
FOOT LINE – GOLD
REAR VIDEO/AUDIO IN NOT USED USED
VCR PLUS+ VCR+ VCR+ C3
REC LINK/INPUT NOT USED USED/L1
CABLE BOX OR DBS.BOX OR SAT CTL NOT USED USED
PAUSE/AV COMPU TERMINAL NOT USED USED
CABLE MOUSE TERMINAL NOT USED USED
CABLE MOUSE NOT USED COUPON

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
SECTION 1
DISASSEMBLY
1.3 Disassembly/assembly method
1.1 Disassembly flow chart
This flowchart lists the disassembling steps for the cabinet
parts and P.C. boards in order to gain access to item(s) to
be serviced. When reassembling, perform the step(s) in re-
verse order. Bend, route and dress the flat cables as they
were originally laid.
1.2
How to read the disassembly and assembly
Note:
•
The bracketed ( ) WR of the connector symbol are as-
signed nos. in priority order and do not correspond to
those on the spare parts list.
(5) Adjustment information for installation
Top cover, Bracket
Front panel assembly
Drum assembly
Mechanism assembly
Mini front board assembly,
Main board assembly
[1]
[2]
[3]
[4]
[5]
Step/
Loc No.
Part Name Fig.
No. Point Note
-----------------
[1] Top cover, D1 2(S1a)
Bracket 2(S1b)
[2] Front panel assembly D2 CN7001(WR2a) <Note 2a>
[HR-VP790U/U(C)], <Note 2b>
7(L2a) <Note 2c>
[3] Drum assembly D3 CON1(WR3a), <Note 2c>
CN1(WR3b),
(S3a), (S3b), (S3c)
[4] Mechanism assembly D4 CN2001(WR4a), <Note 2c>
(S4a), (S4b), <Note 4a>
(S4c), (S4d)
[5] Mini front board D5 2(L5a), <Note 2c>
assembly CN7001(WR5a)
[HR-VP690U/U(C)]
Main board assembly (S5a), (S5b)
(1) (2) (3) (4) (5)
Step/
Loc No.
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>
• When reattaching the Front panel assembly, make sure that
the door opener “a” of the Cassette holder assembly is low-
ered in position prior to the reinstallation.
<Note 2b>
• When reattaching the Front panel assembly, pay careful at-
tention to the switch lever not to make it touch the switch
knob “b” of the Main board assembly from the side.
<Note 2c>
• Be careful not to damage the connector and wire etc. during
connection and disconnection.
When connecting the wire to the connector, be careful with
the wire direction.
<Note 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 page 1-2).
• When reattaching the Mechanism assembly to the Main
board assembly, take care not to damage the sensors on
the Main board assembly.
-----------------

1-2
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.
[1] Top cover
(S1a)
(S1a)
(S1b)
Bracket
[1]
(S1b)
Procedures for Lowering the Cassette holder assembly
<Note 2a>
WR2a [HR-VP790U/U(C)]
<Note 2c>
<Note 2b>
CN7001
“a”
“b”
(L2a)
(L2a)
(L2a)
[2]
Front panel
assembly
(S3b)
[3]
Drum
asembly
CN1
CON1
WR3a
<Note 2c>
(L3a)
(L3b)
(P3)
Roller arm
assy
Inertia plate
(L3c)
WR3b
<Note 2c>
Cleaner assy
Not used
Not used
(S3a) (S3c)
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
Fig. D4 Fig. D5
[4]
Mechanism
assembly
CN2001
Q3002
End sensor
<Note 4a>
WR4a
<Note 2c>
(S4b)
<Note 4a>
(S4a)
<Note 4a>
(S4c)
(S4d)
D3001
LED
<Note 4a>
[5]
Main board
assembly
(L5b)
CN7001
[5] Mini front board assembly
[HR-VP690U/U(C)]
WR5a
<Note 2c>
(L5a)
(L5a)
(S5a)
Note:
When installing the Mechanism assembly, secure the screws
(S4a to S4b) in the order of a, b.

1-4
Fig. 1-4-1a
TP7001
TEST
CN7001
To ADV. Jog
[HR-VP790U/U(C)]
To Mini front board
assembly
[HR-VP690U/U(C)]
TPGND
CP5302
CP4001
TP106
PB.FM
VR6502
SEPARATION 2
TP2253
A.PB.FM
TP4001
CTL.P
TP111
D.FF
Main board
assembly
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) Connect the wires and connectors of the major parts that
have been removed in step (1). (Refer to Fig.1-4-1a.)
(5) Place the combined Mechanism and Main board assem-
blies upside down.
(6) 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 assem-
blies. If they are improperly grounded, there may be
noise on the playback picture or FDP counter display
may move even when the mechanism is kept in an in-
operative status.
•In order to diagnose the playback or recording of the
cassette tape, set the Mechanism assembly to the re-
quired mode before placing it upside down. If the
mechanism mode is changed (including ejection) while
it is in an upside down position the tape inside may
be damaged.
•The mechanism and board assemblies of this unit are
attached by connectors only.
When carrying out a diagnosis or repair of the boards
in the “Service position”, make sure that the connec-
tors are not disconnected.
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 Main board
assembly with a jump wire.
(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 opera-
tions 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.

1-5
1.7 Emergency display function
This unit has a function for storing the history of the past two
emergencies (EMG) and displaying them on each FDP (or
OSD). With the status of the VCR and mechanism at the mo-
ment an emergency occurred can also be confirmed.
Fig. 1-7a Jig RCU [PTU94023B]
(2) Transmit the code “59”from the Jig RCU again.
The FDP shows the EMG detail information <1> in the form
of “* 1 : * 2 : 34 ”.
* 1 : Deck operation mode at the moment of EMG
* 2 : Mechanism operation mode at the moment of EMG
3–: Mechanism sensor information at the moment of
EMG
–4 : Mechanism mode position at the moment of EMG
(3) Transmit the code “59”from the Jig RCU once again.
The FDP shows the EMG detail information <2> in the form
of “* 5 : * 6 : * 7 ”.
* 5 : Type of the cassette tape in use <1> .
* 6 : Winding position of the cassette tape in use
* 7 : Type of the cassette tape in use <2> (Winding area)
(4) Transmit the code “59”from the Jig RCU once again to re-
set the display.
Notes:
•
For the OSD display model, all EMG information are
showed by transmitting first code from the Jig RCU.
• For the EMG content, see “1.7.3 EMG content descrip-
tion”.
• For the EMG detail information <1> , see “1.7.4 EMG de-
tail information <1> ”.
• For the EMG detail information <2> , see “1.7.5 EMG de-
tail information <2>”.
1.7.2 Clearing the EMG history
(1) Display the EMG history.
(2) Transmit the code “36”from the Jig RCU.
(3) Reset the EMG display.
<Example 1> E : 01 : 03
Previous EMG
Latest EMG
No EMG record
<Example 2> E : ––: ––
1.7.1 Displaying the EMG information
(1) Transmit the code “59”from the Jig RCU.
The FDP shows the EMG content in the form of “E:**:**”.
INITIAL MODE
DATA CODE
CUSTOM CODE
43: A CODE
53: B CODE
[Data transmitting method]
Depress the “”( 3 ) button
after the data code is set.
Jig RCU
Notes:
•
The EMG detail information <1><2> show the information
on the latest EMG.
It becomes “––: ––: ––” when there is no latest EMG
record.
• 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).
FDP display model
[FDP display]
0 : 00 : 00
E:** :**
*1: *2 : 34
*5: *6 : *7
E: **:**
*1: *2 : 34
*5: *6 : *7
EMG detail information <2>
EMG detail information <2>
EMG detail information <1>
EMG detail information <1>
EMG content display
(E:Latest:Previous)
Normal display
OSD display model
[OSD display]
EMG EMG content display
(E:Latest:Previous)
FDP (7segment LED) display model
[FDP display]
0: 00
E: **
1: **
2: *1
3: *2
4: 34
5: *5
6: *6
7: *7
Normal display
EMG content display (Latest)
EMG content display (Previous)
EMG detail information <1>
[Deck operation mode]
EMG detail information <1>
[Mechanism operation mode]
EMG detail information <1>
[Mechanism sensor information and Mechanism mode position]
EMG detail information <2>
[Type of the cassette tape in use <1>]
EMG detail information <2>
[Winding position of the cassette tape in use]
EMG detail information <2>
[Type of the cassette tape in use <2> (Winding area)]
(EMG-02e)

1-6
1.7.3 EMG content description
Note:
EMG contents “E08/E09”are for the model with Dynamic Drum (DD).
Table 1-7-3a
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 rollers
are turned off and stopped, and the power is turned off.
When the cassette insertion operation does not complete
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 wind-
ing 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 sup-
plied 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.
1. The absolute value sensor is defective. (The soldered parts have separated.)
2. The pull-up resistor at the absolute sensor output is defective. (The soldered parts
have separated.)
3. Contact 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.
1. The FG sensor is defective. (The soldered parts have separated.)
2. The pull-up resistor at the FG sensor output is defective. (The soldered parts have
separated.)
3. Contact failure or soldering failure of the pins of the connector (board-to-board) to the FG sensor.
4. The power to the sensor is not supplied. (Connection failure/soldering failure)
5. The FG pulse is not sent to the System Controller CPU.
6.
The tilt motor is defective. (The soldered parts have separated.)
7. The drive power to the tilt motor is not supplied. (Connection failure/soldering failure)
8. The tilt motor drive MDA - IC is defective.
9. Auto-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 rotate
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 rotate
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.
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:C1] or [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:C1”or “E:U1”/ FDP : “U:01”/ OSD : “Try cleaning tape.”or “Use cleaning cassette.”
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.
EC1 or 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
E08: DD Initialized
(Absolute
Position
Sensor)
EMG
E09: DD FG EMG

1-7
1.7.4 EMG detail information <1>
The status (electrical operation mode) of the VCR and the sta-
tus (mechanism operation mode/sensor information) of the
mechanism in the latest EMG can be confirmed based on the
figure in EMG detail information <1> .
[FDP/OSD display]
* 1 : * 2 : 34
* 1 : Deck operation mode at the moment of EMG
* 2 : Mechanism operation mode at the moment of EMG
3–: Mechanism sensor information at the moment of EMG
–4 : Mechanism mod
e position at the moment of EMG
Note:
•
For EMG detailed information <1>, the content of the code
that is shown on the FDP (or OSD) differs depending on
the parts number of the system control microprocessor
(IC3001) of the VCR. The system control microprocessor
parts number starts with two letters, refer these to the cor-
responding table.
* 1 : Deck operation mode
[Common table of MN*, HD* and M3*]
00 - Mechanism being initialized
01 00 STOP with pinch roller pressure off (or tape present with P.OFF)
02 01 STOP with pinch roller pressure on
03 - POWER OFF as a result of EMG
04 04 PLAY
0C 0E REC
10 11 Cassette ejected
20 22 FF
21 - Tape fully loaded, START sensor ON, short FF
22 - Cassette identification FWD SEARCH before transition to FF (SP
x7-speed)
24 26 FWD SEARCH (variable speed) including x2-speed
2C 2E INSERT REC
40 43 REW
42 - Cassette identification REV SEARCH before transition to REW (SP
x7-speed)
44 47 REV SEARCH (variable speed)
4C 4C AUDIO DUB
6C 6E INSERT REC (VIDEO + AUDIO)
84 84 FWD STILL / SLOW
85 85 REV STILL / SLOW
8C 8F REC PAUSE
8D - Back spacing
8E - Forward spacing (FWD transport mode with BEST function)
AC AF INSERT REC PAUSE
AD - INSERT REC back spacing
CC CD AUDIO DUB PAUSE
CD - AUDIO DUB back spacing
EC EF INSERT REC (VIDEO + AUDIO) PAUSE
ED - INSERT REC (VIDEO + AUDIO) back spacing
* 2 : Mechanism operation mode
[Common table of MN* and M3*]
[Table of HD]
Display Mechanism operation mode
00 STOP with pinch roller pressure off
01 STOP with pinch roller pressure on
02 U/L STOP (or tape being loaded)
04 PLAY
05 PLAY (x1-speed playback using JOG)
0E REC
11 Cassette ejected
22 FF
26 FWD SEARCH (variable speed) including x2-speed
2E INSERT REC
43 REW
47 REV SEARCH
4C AUDIO DUB
6E INSERT REC (VIDEO + AUDIO)
84 FWD STILL/SLOW
85 REV STILL/SLOW
8F REC PAUSE
AF INSERT REC PAUSE
C7 REV SEARCH (x1-speed reverse playback using JOG)
CD AUDIO DUB PAUSE
EF INSERT REC (VIDEO + AUDIO) PAUSE
F0 Mechanism being initialized
F1 POWER OFF as a result of EMG
F2 Cassette being inserted
F3 Cassette being ejected
F4 Transition from STOP with pinch roller pressure on to STOP with pinch
roller pressure off
F5 Transition from STOP with pinch roller pressure on to PLAY
F6 Transition from STOP with pinch roller pressure on to REC
F7 Cassette type detection SEARCH before FF/REW is being executed
F8 Tape being unloaded
F9 Transition from STOP with pinch roller pressure off to STOP with pinch
roller pressure on
FA Transition from STOP with pinch roller pressure off to FF/REW
FB Transition from STOP with pinch roller pressure off to REC.P (T.REC,etc.)
FC Transition from STOP with pinch roller pressure off to cassette type de-
tection SEARCH
FD Short REV being executed after END sensor on during unloading
FE Tension loosening being executed after tape loading (STOP with pinch
roller pressure on)
Display Deck operation mode
MN*/M3* HD*
00 00 Command standby (Status without executing command)
02 02 POWER OFF by EMG occurrence
04 04 Moving to the adjacent position in the LOAD direction
06 06 Moving to the adjacent position in the UNLOAD direction
08 08 Cassette ejection being executed / Cassette housing ejection being
executed
- 0A Mode transition to STOP with cassette ejection end
0A 0C Cassette insertion being executed
0C 0E Tape being loaded
0E 10 Tape being unloaded
10 12 Mode transition to STOP with pinch roller compression ON
12 14 Mode transition to STOP with pinch roller compression OFF
14 16
Mode transition to STOP with pinch roller compression OFF as a result
of POWER OFF
16 18 Mode transition to STOP with pinch roller compression ON as a result
of POWER ON
18 1A Mode transition to PLAY
1A 1C Mode transition to FWD SEARCH
1C 1E Mode transition to REC
1E 20 Mode transition to FWD STILL / SLOW
20 22 Mode transition to REV STILL / SLOW
22 24 Mode transition to REV SEARCH
24 26 Mode transition from FF / REW to STOP
26 28 Mode transition to FF
28 2A Mode transition to REW
2A 2C 4 sec. of REV as a result of END sensor going ON during loading
2C 2E Short FF / REV as a result of END sensor going ON during unloading
2E 30 Mechanism position being corrected due to overrun
80 80 Mechanism in initial position (Dummy command)
Display Mechanism operation mode
MN* M3*

1-8
-0 -7 - Initial value
-1 -0 - EJECT position
- - -0 EJECT position (Cassette housing drive mode)
-2 -7 - Housing operating
- - -1 Between EJECT and U / L STOP
-3 -1 -2 U / L STOP position
- - -3 Guide arm drive position
-4 -7 -4 Tape being loaded / unloaded (When the pole base is
located on the front side of the position just beside the
drum)
-5 -2 -5 Tape being loaded / unloaded (When the pole base is
located on the rear side of the position just beside the
drum)
-6 -7 -6 Pole base compressed position
-7 -3 -F FF / REW position
-8 -7 -F Between FF / REW and STOP with pinch roller compres-
sion ON
-9 -4 -F STOP with pinch roller compression OFF
-A -7 -E Between STOP with pinch roller compression OFF and
REV
-B -5 - REV (REV STILL / SLOW) position
- - -D REV position
- - -C Between REV and REV STILL / SLOW
- - -B REV STILL / SLOW position
-C -7 - Between REV and FWD
- - -A Between REV STILL / SLOW and FWD STILL / SLOW
-D -6 - FWD (FWD STILL / SLOW) position
- - -9 FWD STILL / SLOW position
-E -7 - Between FWD and PLAY
- - -8 Between FWD STILL / SLOW and PLAY
-F -6 -7 PLAY position
0- VHS Cassette insertion Tab broken ON ON
1- VHS Cassette insertion Tab broken ON OFF
2- VHS Cassette insertion Tab broken OFF ON
3- VHS Cassette insertion Tab broken OFF OFF
4- VHS Cassette insertion Tab present ON ON
5- VHS Cassette insertion Tab present ON OFF
6- VHS Cassette insertion Tab present OFF ON
7- VHS Cassette insertion Tab present OFF OFF
8- S-VHS Cassette ejection Tab broken ON ON
9- S-VHS Cassette ejection Tab broken ON OFF
A- S-VHS Cassette ejection Tab broken OFF ON
B- S-VHS Cassette ejection Tab broken OFF OFF
C- S-VHS Cassette ejection Tab present ON ON
D- S-VHS Cassette ejection Tab present ON OFF
E- S-VHS Cassette ejection Tab present OFF ON
F- S-VHS Cassette ejection Tab present OFF OFF
3–: Mechanism sensor information
[Common table of MN*, HD* and M3*]
Mechanism sensor information
Display
MN* / HD* M3* REC safety Start End
S-VHS SW CASS SW SW sensor sensor
* 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 or ––” : Tape position not identified
–4 : Mechanism mode position
[Common table of MN*, HD* and M3*]
Display Mechanism mode position
MN* HD* M3*
Note:
•
The values of cassette tape type <2> in the above table
are typical values with representative cassette tapes.
* 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-90 / 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-360
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
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 identi-
fication, the cassette tape type may not be able to be identified.
• If other value than those listed in the above table is displayed,
the cassette tape type is not identified.
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
* 5 : Cassette tape type <1>
Note:
•EMG detail information <2> is the reference information
stored using the remaining tape detection function of the
cassette tape. As a result, it may not identify cassette cor-
rectly when a special cassette tape is used or when the
tape has variable thickness.
1.7.5 EMG detail information <2>
The type of the cassette tape and the cassette tape winding po-
sition can be confirmed based on the figure in EMG detail infor-
mation <2> .
[FDP/OSD 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 th
e cassette tape in use <2> (Winding area)
Note:
•In the case of the "HD”microprocessor, as the display is
always "-7”at any intermediate position between modes,
the position of transitory EMG may sometimes not be lo-
cated.

2-1
SECTION 2
MECHANISM ADJUSTMENT
2.1 Before starting repair and adjustment
2.1.1 Precautions
(1) Unplug the power cord plug of the VCR 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 reattaching the front panel assembly, make sure
that the door opener of the cassette holder assembly is
lowered in position prior to the reinstallation. (See SEC-
TION 1 DISASSEMBLY.)
(6) 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). (See SECTION 1 DISASSEM-
BLY.)
2.1.2 Checking for proper mechanical operations
Enter the mechanism service mode when you want to oper-
ate the mechanism when no cassette is loaded. (See SEC-
TION 1 DISASSEMBLY.)
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 cord plug from the power outlet.
(2) Refer to the disassembly procedure and perform the dis-
assembly of the major parts before removing the drum
assembly.
(3) Unload the pole base assembly by manually turning the
loading motor of the mechanism assembly toward the
front. In doing so, hold the tape by the hand to keep the
slack away from any grease. (See Fig.2-1-3a.)
(4) Bring the pole base assembly to a pause when it reaches
the position where it is hidden behind the cassette tape.
(5) 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.2-1-3b.)
(6) Remove the cassette tape by holding both the slackened
tape and the cassette lid.
(7) Take up the slack of the tape into the cassette. This com-
pletes removal of the cassette tape.
Note:
• For the disassembly procedure of the major parts and
details of the precautions to be taken, see “SECTION
1 DISASSEMBLY”.
Fig. 2-1-3b
Fig. 2-1-3a
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 SECTION 1 DASASSEMBLY.)
(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.2-1-3c.)
(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.2-1-3d.)
(4) In the same way as in the electrical failure instructions in
2.1.3-1(5), 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 cas-
sette.
Fig. 2-1-3d
Fig. 2-1-3c
Pole base assembly (take-up side)
Pole base assembly
(supply side)
Tension arm assembly
Guide pole guard
Pinch roller arm assembly
Press lever assembly
Take the spring
off the hook, and
detach it from the
tape.
2.1.4 Jigs and tools required for adjustment
Roller driver
PTU94002
A/C head positioning tool
PTU94010
Back tension cassette gauge
PUJ48076-2
Jig RCU
PTU94023B
Torque gauge
PUJ48075-2
Alignment tape
(SP, stairstep, NTSC)
MHP
Alignment tape
(EP, stairstep, NTSC)
MHP-L

2-3
2.1.5 Maintenance and inspection
1. Location of major mechanical parts
In this chapter, the two mechanism speeds are described by comparing the speeds of the standard type and the high-speed
FF/REW type.
It is possible to distinguish between these two types of mechanism by the diameters of their capstan pulleys.
The capstan pulley diameter for the standard type is approx. 32 mm.
The capstan pulley diameter for the high-speed FF/REW type is approx. 43 mm.
For information on the different parts used in the two mechanism types, please refer to the “Replacement of major parts”.
Fig. 2-1-5a Mechanism assembly top side
Stator assembly
UV catcher2 (supply and take-up side)
Drum assembly Head base
A/C head
Loading motor
Pinch roller arm
assembly
Guide pole guard
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
T6
Fig. 2-1-5b 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

2-4
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. 2-1-5c Mechanism assembly left side
Fig. 2-1-5d Mechanism assembly right side
5. Disassembling procedure table
The following table indicates the order in which parts are re-
moved 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 symbols and numbers preceding the individual part
names represent the numbers in the “Location of major me-
chanical 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.
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.
Note:
•See the “mechanism assembly”diagram of the parts
list for the lubricating or greasing spots, and for the
types of oil or grease to be used.
~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
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 neces-
sary. 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 2-1-5a
Other Drive Tape transport

2-5
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 Clutch 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
(
*1
)
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
T1
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
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 A/C 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 gear B 5
2.2.12 Coupling gear B 6
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) B8
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 (
*1
) 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
1 2 3 4 5
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
Table 2-1-5b
Note:
•The parts with marked ( *
)have different types of mecha-
nisms (standard type or high-speed FF/REW type).
*1: Uses the standard type mechanism only.
*2: Uses the high-speed FF/REW type mechanism only.

2-6
(4) While swinging the lock levers (R) and (L) of the cassette
holder assembly toward the front, slide the cassette
holder assembly until its legs come to where the guide
rail and the roller cam assembly have been removed (so
that the drive arm is upright). (See Fig.2-2-3c.)
Fig. 2-2-3c
Cassette holder assembly
Lock lever (L) Drive arm
(Upright)
Le
g
Le
g
s
2.2.3 Cassette holder assembly
1. How to remove
(1) Remove the guide rail and roller cam assembly. (See
Fig.2-2-3a.)
(3 lugs on the guide rail and one lug on the roller cam
assembly)
Fig. 2-2-2a
Worm gear
Guide hole
Control cam
Chassis hole
Control plate
Mark E
Fig. 2-2-3b
(2) Remove the two slit washers and remove the cassette
housing bracket. (See Fig.2-2-3b.)
(3) Remove the opener guide, spring(A), door opener, relay
gear and limit gear. (See Fig.2-2-3b.)
Fig. 2-2-3a
Lugs Lug
Lug
Guide rail
Roller cam
assembly
Limit gear
Relay gear
Opener guide
Spring(A)
Cassette housing bracket
Slit washers
Door opener
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.)
This unit is provided with a mechanism assembly mode. It is
therefore necessary to enter this mode for assembling and
disassembling procedures.
This mode is usually not in use, manually set it when it is
required.
2.2.2 How to set the “Mechanism assembling mode”
Remove the mechanism assembly and place it bottom side
up. (See SECTION 1 DISASSEMBLY.) Turn the worm gear
toward the front so that the guide hole of the control cam is
brought into alignment with the hole at the mechanism as-
sembly chassis. This position renders the mechanism assem-
bling mode operational. Make sure that the control plate is
located in alignment with the mark E. (See Fig.2-2-2a.)

2-7
Fig. 2-2-3d
(5)
While holding the left side of the cassette holder, lift the
cassette holder assembly so that the three legs on the
left side are all released. Then pull the legs (A) and (B)
on the right side out of the rail and also pull up the leg(C).
(See Fig.2-2-3d and Fig.2-2-3e.)
(6) Draw out the drive gear, and remove the drive arm.
Fig. 2-2-3e
Cassette holder assembly
Cassette holder assembly
(A)
(C) (B)
Fig. 2-2-3f
Hole
Hole
Drive arm
Drive gear
Drive arm
(1)
(2)
(A)
(B)
Main deck right side
Fig. 2-2-3g
2. How to install (Phase matching)
(1) Insert the section (A) of the drive arm into the section (B)
of the main deck.
(2) Insert the section (1) of the drive gear into the round hole,
and the section (2) into the square hole on the drive arm.
(See Fig.2-2-3f.)
(3) Hold the drive arm upright and fit the leg (C) on the right
side of the cassette holder assembly into the groove. (See
Fig.2-2-3g.)
(4) While swinging the lock lever (R) of the cassette holder
assembly toward the front, put the legs (A) and (B) into
the rail. (See Fig.2-2-3g.)
(5) Drop the three legs on the left side of the cassette holder
assembly into the groove at one time. (See Fig.2-2-3h.)
(6) Slide the whole cassette holder assembly toward the front
to bring it to the eject end position.
(7) Install the limit gear so that the notch on the outer cir-
cumference of the limit gear is brought into alignment with
the guide hole on the main deck. (See Fig.2-2-3i.)
(8) Install so that the notch on the periphery of the relay gear
is aligned with the notch of the main deck and that hole
A of the relay gear is aligned with the hole A of the limit
gear and that hole B of the relay gear is aligned with the
hole B of the drive gear. (See Fig.2-2-3i.)
(9) Install the door opener, opener guide, spring(A) and cas-
sette housing bracket and fasten the two slit washers.
Cassette holder assembly
Drive arm
Lock lever (R)
(A)
(C) (B)
Fig. 2-2-3h
Cassette holder assembly