Power requirement: AC 220 V – 240 V`, 50 Hz/60 Hz
Power consumption
Temperature
Operating: 5°C to 40°C
Storage: –20°C to 60°C
Operating position: Horizontal only
Dimensions (WxHxD): 435 mm x 124 mm x 391 mm
Weight: 6.7 kg
Input/Output: 21-pin SCART connectors :
VHS DECK VIDEO/AUDIO
Signal system: PAL-type colour signal and CCIR monochrome
Recording system: DA4 (Double Azimuth) head helical scan system
Format: S-VHS/VHS PAL standard
Signal-to-noise ratio: 45 dB
Horizontal resolution
No. 82842
Frequency range: 70 Hz to 10,000 Hz (Normal audio)
Maximum recording time
SR-VS20E/EK
TV
VHS
DV
CABLE/SAT
– –:– –
LCD PROG
1
AUDIO
TV/VCR
2
123
3
456
DAILY/QTDN.
VPS/PDC
WEEKLY/HEBDO
4
789
4
0000
AUX
MENU
0
ENTER/ENTREE
OK
1
PROG
30
SEC
3
2
START
STOP
DATE
PR
DEBUT
FIN
EXPRESS
P
V
R
T
+
T
+
V
V
–
T
–
T
R
V
P
(The specifications shown pertain specifically to the model SR-VS20E)
Power on: 33 W
Power off: 7.9 W
IN/OUT x 1, IN/DECODER x 1
RCA connectors:
VIDEO IN x 1, AUDIO IN x 1, AUDIO OUT x 1
S-Video connectors: IN x 1, OUT x 1
DV connector: IN/OUT x 1
(4-pin, IEEE1394 conformity, digital input/output)
signal, 625 lines 50 fields
(SP/LP): 250 lines (VHS)
400 lines (S-VHS)
(EP): 220 lines (VHS)
350 lines (S-VHS)
20 Hz to 20,000 Hz (Hi-Fi audio)
(SP): 240 min. with E-240 video cassette
(LP): 480 min. with E-240 video cassette
(EP): 720 min. with E-240 video cassette
DV IN/OUT
ENTREE/SORTIE DV
VHSDV
A.DUBINSERT
DUB
COPIE
PR
DVVHS
DV DECK VIDEO/AUDIO
Signal system: PAL-type colour signal, 625 lines 50 fields
Recording system: Digital Component Recording
Format: DV format (SD mode)
Cassette: Mini DV Cassette
Maximum recording time
(LP): 90 min. with M-DV60ME cassette
Audio recording system
DV MAIN BOARD ASSEMBLY <50> ............................................................... 5-26
LOADING MOTOR BOARD ASSEMBLY <55> ............................................... 5-32
JOG BOARD ASSEMBLY <85> ....................................................................... 5-32
4-5
4-37
4-53
4-61
The following table lists the differing points between Models (SR-VS20EK and SR-VS20E) in this series.
SR-VS20EKSR-VS20E
VIDEO SYSTEMPAL/NTSC PB ON PAL TVPAL/MESECAM(MANUAL)/NTSC PB ON PAL TV
TUNER (BROADCASTING STANDARD)IB/G, D/K
TUNER (STEREO DECODER)NICAMNICAM/A2
DISPLAY (LANG.)ENGLISH3 LANGUAGE
TIMER (VCR PLUS+)VIDEO PLUS+ DELUXESHOW VIEW DELUXE
TIMER (VPS)NOT USEDUSED
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.
Precautions during Servicing
•
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 comply 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 Tape3) Spacers5) Barrier
2) PVC tubing4) 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.
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 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).
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.1
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.
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 cathode 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.
Fig.4
(3) Align the lengths of the wires to be connected. Insert the
wires fully into the connector.
Metal sleeve
Connector
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.
1.25
2.0
5.5
Fig.6
(5) Check the four points noted in Fig.7.
Not easily pulled free
Wire insulation recessed
more than 4 mm
Fig.7
Crimping tool
Crimped at approx. center
of metal sleeve
Conductors extended
I
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 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’) between soldered terminals, and between terminals and surrounding metallic parts. See table 1
below.
Fig. 8
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.
Externally
exposed
accessible part
Fig. 9
Z
V
ab
A
c
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
Table 1 Specifications for each region
Table 2 Leakage current specifications for each region
Note: These tables are unofficial and for reference only. Be sure to confirm the precise values for your particular country and locality.
II
S40888-01
SECTION 1
DISASSEMBLY
1.1 HOW TO REMOVE THE MAJOR PARTS
1.1.1 Introduction
This set is a double-deck video recorder integrating a Mini DV
deck and a VHS deck. Its internal structure is divided into three
sections that include the power supply, VHS and DV sections.
Therefore, the removal of major parts will also be described
under three separate sections as listed below.
1. COMMON section
2. VHS section
3. DV section
< TOP VIEW >
1. COMMON section
3. DV section
2. VHS section
Fig. 1-1-1
1.2 HOW TO READ THE DISASSEMBLY AND ASSEMBLY
Step/
Loc No.
1
Top cover, Bracket COM1
Front panel
2
assembly
Fig. No.
4(S1), 3(S2), 2(L1), (L2)
2(S3)
COM2 8(L3),
CN7507(WR1),
CN3011(WR2)
PointNotePart name
—
<Note
1,2,3,4>
§§ §§ §
(1)(2)(3)(4)(5)
(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,
CN**(WR**)= Remove the wire (WR**) from the connector
(CN**).
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
1.3 DISCONNECTION OF CONNECTORS (WIRES)
FPC
CONNECTOR
FPC
CONNECTOR
Fig. 1-3-1Fig. 1-3-2
FPC
CONNECTOR
FPC
CONNECTOR
Fig. 1-3-3Fig. 1-3-4
FPC
CONNECTOR
Fig. 1-3-5
1.4 SCREWS USED CABINET COMPONENTS AND
BOARD ASSEMBLIES
Table 1-4-1 below shows the symbols, shapes, colors and
part numbers of screw that are used in the cabinet components and board assemblies and are appearing in the disassembling/reassembling diagrams in this manual.
When screwing them again in reassembling, be sure to use
them correctly referring to the following table.
Notes:
• Screw that are asterisked (marked with*) in the shape col-
umn are fixed with screw lock agent. If such the screw is
once removed, never use it again.
• The Screw symbols are assigned nos. in priority order and
do not correspond to those on the spare parts list.
This flowchart shows the disassembly procedure for the exterior parts and electrical parts.
Basically, reverse this procedure when assembling them.
1Top cover, Bracket
<Note 5>
When removing the SW REG board assembly or Regulator board assembly, unhook the several spacers connecting it with pliers from the top side.
<Note 6>
Perform the work by leaving fan motor attached to the rear
cover except when replacing the fan motor.
When attaching the rear cover, please be careful with the
wiring.
LED/SW board assembly,
Eject SW board assembly,
Jack board assembly,
Jog board assembly
SW REG board
4
assembly
Regulator board
5
assembly
COM3 10(S4)
6(S4), Knob(Jog),
Knob(Shuttle),
COM4 2(S5), 2(L4), (L5)
CN5301(WR3),
COM5 3(L6),
CN5322(WR4),
CN5321(WR5),
<Note 1,
5>
<Note 1,
5>
CN5325(WR6),
CN5324(WR7),
CN5323(WR8)
6
COM6 4(S2), 6(S6),
Fan motor
<NOTE 6>Rear cover
<Note 1>
When attaching the FPC, be sure to connect it in the correct orientation.
<Note 2>
When attaching the front panel assy, make sure that the
door openers of both decks (DV, VHS) are in the down
position.
<Note 3>
When attaching the front panel assy, be careful not to damage the DV terminals.
<Note 4>
When attaching the FPC take care that it is not caught.
Pass the DV-side FPC between the base (2) and DV Main
board assy.
Pass the two VHS-side FPCs below the base (1).
(S3)
6
(S2)
9
Bracket
1
5
(S2)
(S1)
7
(S2)
4
(S1)
3
Top cover
(L2)
8
(S3)
1
1
(S1)
(L1)
2
(S1)
—
—
Fig. COM1
<Note 4>
FPC
<Note 2>
DV SIDE
Base (2)
<Note 3>
DV Main board
assembly
(L3)
(L3)
Base (1)
(L3)
CN3011
<Note 4>
WR2
WR1
(L3)
CN7507
<Note 1>
Supporting
tape side
<Note 2>
VHS SIDE
2
Fig. COM2
1-2
<Note 6>
Fan Motor
6
28
(S2)
29
(S2)
33
(S6)
32
(S6)
35
(S6)
34
(S6)
36
(S6)
37
(S6)
30
(S2)
31
(S2)
22
5
CN5325
CN5324
WR8
WR5
Foil side
<Note 1>
WR4
Foil side
<Note 1>
WR6
WR7
CN5321
CN5322
(L6)
Spacer
<Note 5>
(L6)
Spacer
<Note 5>
CN5323
(S4)
21
(S4)
(S4)
2
Knob (Jog)
Knob (Shuttle)
3
Eject SW
board assembly
Jack board
assembly
11
(S4)
10
(S4)
Jog board assembly
LED/SW board
assembly
Display board
assembly
9
(S4)
20
(S4)
23
(S4)23(S4)
25
(S4)
24
16
(S4)
15
(S4)
14
(S4)
17
(S4)
(S4)
18
(S4)
13
(S4)
12
(L5)
26
(S5)
Fig. COM3
27
(S5)
Fig. COM5
WR3
Supporting
tape side
<Note 1>
4
CN5301
Spacer
<Note 5>
(L4)
Fig. COM4
Fig. COM6
1-3
HOW TO REMOVE THE MAJOR PARTS <VHS section>
1.6
1.6.1 Disassembly flow chart
This flowchart shows the disassembly procedure for the exterior parts and electrical parts.
Basically, reverse this procedure when assembling them.
However, it is required to remove the common section parts
as far as 1 “Top cover Bracket” and 2 “Front panel assembly” in advance. (See section 1.5.)
1Drum assembly
2Mechanism assembly
3Main board assembly / 4 Base (1)
4Base (1)
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.
When attaching or removing the FPC, take care not to disconnect any of the wires.
<Note 2>
When attaching the FPC, be sure to connect it in the correct orientation.
<Note 3>
When attaching wires, connect them in the correct orientation.
Fig. 3
Turn the loading motor pulley in the direction as indicated by
Fig.2. As both A and B levers are lodged twice, push the
levers in the direction as indicated by Fig.3 to release them.
When pushing the levers, do it in the order of A , B , B , A .
When the holder has been lowered, turn the pulley until the
cassette holder is securely in place without allowing any up/
down movement.
Procedures for Lowering the Cassette holder assembly
Note: When installing the Drum assembly, secure the
screws (S7) in the order of a , b , c .
Roller arm
assy
Inertia plate
(L1)
(P1)
(L2)
(S7)
1
a
2
(S7)
WR9
Foil side
c
<Note 2>
CON1
3
(S7)
b
WR10
Foil side
<Note 1,2>
1
Cleaner assy
<Note 4>
• When it is required to remove the screws (S8) retaining the
Mechanism assembly, please refer to the “Procedures for
Lowering the Cassette holder assembly”(See on page 1-5).
• When removing the Mechanism assembly only, unhook the
two spacers connecting it with the Main board assembly with
pliers from the back side of the Main board assembly first,
and then remove the Mechanism assembly.
• When reattaching the Mechanism assembly to the Main
board assembly, take care not to damage the sensors on
the Main board assembly (D3001: LED, Q3002: Start sensor, Q3003: End sensor, S3002: S cassette switch).
1-4
Not use
CN1
Fig. V1
Note: When installing the Mechanism assembly, secure
the screws (S8) in the order of a , b .
6
5
(S8)
<Note 4>
Mechanism assy
Spacer
(S9)
(L3)
Spacer
<Note 4>
4
(S8)
<Note 4>
S3002
S cassette switch
<Note 4>
WR11
Foil side
<Note 2>
(S10)
(L4)
Spacer
<Note 4>
7
2
15
(S3)
WR5
Foil side
<Note 2>
14
(S3)
3
WR4
Foil side
<Note 2>
CN3014
WR12
Foil side
<Note 2>
16
(S5)
WR13
9
(S6)
CN2601
CN703
8
(S6)
(S6)
CN5321
WR14
Foil side
<Note 2>
CN5322
10
(S6)
11
12
(S6)
13
(S6)
Fig. V3
<Note 4>
Fig. V2
17
(S3)
18
(S5)
19
(S5)
4
20
(S5)
Fig. V4
1-5
HOW TO REMOVE THE MAJOR PARTS <DV section>
1.7
1.7.1 Disassembly flow chart
This flowchart shows the disassembly procedure for the exterior parts and electrical parts.
Basically, reverse this procedure when assembling them.
However, it is required to remove the common section parts
as far as 1 “Top cover, Bracket” and 2 “Front panel assembly” in advance. (See section 1.5.)
With due regard to operational considerations, remove the
parts located on the base (2) (i.e. Mechanism assembly,
P/R MDA board assembly etc.) together before removing
the major parts.
<Note 2>
Take care not to scratch or damage the drum assembly
by the cleaner assembly when performing work.
<Note 3>
Take care not to damage the board assembly when detaching parts.
<Note 4>
When attaching the FPC, be sure to connect it in the correct orientation.
1
(S5)
WR17
CN1501
(L1)
2
(S5)
(L2)
2
3
(S5)
Base(2)
WR16
(S11)
CN5506
CN5502
Fig. D1
5
Fig. D2
4
(S5)
CN5501
1
<Note 1>
WR7
WR17
6
(S11)
(L2)
WR18
CN5507
1-6
Earth
6
20
(S5)
WR13
CN3501
CN3701
CN1001
CN1002
WR12
<Note 3>
Foil side
<Note 4>
Supporting
tape side
<Note 3>
WR14
WR8
17
(S5)
19
(S5)
18
(S5)
plate
(
7
S12
)
(
S11
9
(S5)
8
)
10
(S5)
CN5505
CN5502
CN5001
5
15
(
S13
3
14
(
)
S13
16
)
(
S13
)
11
(S4)
WR20
WR19
WR23
Fig. D3
12
(S4)
CN5503
WR21
13
(S4)
CN5504
WR22
<Note 2>
Fig. D5
(L3)
Fig. D4
4
Fig. D6
1-7
1.8 SERVICE POSITIONS
The servicing locations for use in troubleshooting or servicing of the set are provided separately for the VHS and DV.
I SERVICE POSITIONS <VHS SIDE>
II SERVICE POSITIONS <DV SIDE>
1.8.1 Service position <VHS SIDE>
<Removal>
(1) Remove the top cover and bracket.
(2) Remove the front panel assembly.
(3) Remove the MAIN board assembly together with the
mechanism assembly.
Fig. No.
(Page)
(1)
Top cover,
COM192 + 1
Bracket(1-3)(No.1-9)(L1,2)
(2) Front
panel
COM2082
(1-3)(L3)(CN7507/—
assembly
(3) Main
board
V2, V31305
(1-6)(No.4-16)(CN5321/
assembly
(etc.)
ScrewHook, etc. ConnectorNote
0—
CN3011)
CN5322/
CN3014/—
CN703/
CN2601)
< Installation >
(1) Stand up the bottom chassis assembly so that the DV/
Regulator side is in the lower position.
(2) Connect the PATCH CORD to the three FPCs then con-
nect CN3014, CN7508 and CN7509.
(3) By connecting a total of two FPCs and wires (CN703/
CN2601), carry out the installation so that the Main board
assembly comes in the upper position.
Point: • Take care that the FPCs and wires are not
subjected to stress in this positioning.
(4) Connect the PATCH CORDS to the two FPCs of the front
panel assembly, then connect the CORDS to the
CN7507/CN3011.
For the PATCH CORD is required, see Table 1-8-3.
Table 1-8-1
PATCH CORD
PTU94017B
Main board assembly
CN7507
1
CN7508
6
7
CN2601
D
3
C
4
CN5322
5
CN5321
CN3501
CN7509
CN3011
CN703
CN3014
A
B
2
E
CN3701
1-8
Front panel assembly
Fig. 1-8-1 Service position <VHS side>
CN1002
1.8.2 Service position <DV SIDE>
<Removal>
(1) Remove the top cover and bracket.
(2) Remove the front panel assembly.
(3) Remove the mechanism assembly (DV side) together
with the base (2).
(4) Remove the DV Main board assembly.
Note:
Place an insulation sheet on the mechanism assembly
•
(VHS side), then remove the DV Main board assembly
and place it on the insulation sheet.
When removing the DV Main board assembly, only remove a connector CN1002 out of four.
Take care not to damage the parts during operating.
(1)
Top cover,
Fig. No.
(Page)
COM192 + 10—
ScrewHook, etc. ConnectorNote
Bracket(1-3)(No.1-9)(L1,2)
(2) Front
panel
assembly
(3)
MechanismD1404
COM2082
(1-3)(L3)(CN7507/—
CN3011)
(DV SIDE)/(1-7)(No.1-4)(CN1502/
BASE (2)CN5002/—
CN5506/
CN5501)
(4) DV Main
board
D6401
(1-8)(No.17-20)(CN1002)
Note
assembly
Table 1-8-2
< Installation >
For the PATCH CORDS, see Table 1-8-3.
The patch cords that are indicated in Table 1-8-3 are in one
package.
(1) Connect a PATCH CORD to the FPC, and connect the
end to the connector CN1002.
(2) Connect PATCH CORDS to the three connectors/FPCs
(CN5506/CN5002/CN1502).
(3) Place the mechanism assembly (DV side) on the origi-
nal position and connect the four wires/FPCs/connectors
(CN5501/CN5506/CN5002/CN1502).
(4) Connect PATCH CORDS to the two FPCs of the FRONT
PANEL ASSEMBLY, and connect the ends to the
CN7507 and CN3011.
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”.
1.9.1 How to set the "MECHANISM SERVICE MODE"
(1) Disconnect VCR from AC.
(2) Connect TPGND and TP7001 (TEST) on the Display
board assembly with a jump wire.
(3) Connect VCR to AC.
(4) Press the POWER button.
(5) With lock levers A B on the left and right of the Cassette
holder assembly pulled toward the front, slide the holder
in the same direction as the cassette insertion direction.
(For the positions of lock levers A B , refer to the “Procedures for Lowering the Cassette holder assembly” on
page 1-5 of 1.6 HOW TO REMOVE THE MAJOR PARTS
<VHS section>
(6) The cassette holder lowers and, when the loading has
completed, the mechanism enters the desired mode.
Swithing regulator
board assembly
DV Main
board assembly
Fan
board assembly
P/R MDA
board assembly
DV mechanism
Regulator
Main board assembly
TP GND
Terminal board assembly
S-Sub
board assembly
VR701
DV AG C
TP701
On screen
D AGC
board assembly
TP106
PB FM
VHS mechanism
CN3011CN7507
Supporting
tape side
3D Digital
/2M board
assembly
VR401
D/A
LEVEL ADJ
Demodulator
board
assembly
TP2253
A.PB FM
TP4001
CTL.P
TP111
D.FF
1-10
TP7001
TEST
TPGND
LED SW
board assembly
PATCH COAD
PTU94022-18
QUQ112-1840CG
Display board assembly
<Front panel assembly>
Fig. 1-9-1
Jack board assembly
Jog board
assembly
Eject SW board assembly
PATCH COAD
PTU94022-16
QUQ112-1640CG
1.10CONNECTION
Treat the wire so as not to come to
DV cassette housing when attaching
the Front panel assembly.
Absorb the looseness
of the 13 ,
14
wires in
the Main part.
Fix the wire by
Style pin surely.
Foil side
Supporting
tape side
Supporting
tape side
Supporting
tape side
Supporting
tape side
Supporting
tape side
Make a
crease.
Make a
crease.
Make a crease.
A
C
CN5325
CN5321 CN5322
CN5301
(Lower)CN5201
CN703
CN7506
CN512
CN7508
CN2601
CN3001
CN2001
CN1
CN1
CON1
CN7509
CN3014
6
3
14
16
17
4
9
5
8
7
12
13
24
11
18
22
20
19
23
15
12
21
10
Foil side
Foil side
Foil side
Foil side
Foil side
Foil side
Foil side
Foil side
Foil side
Foil side
A/C HEAD
DRUM
Treat the wire
according to the
figure not to
overlap in TP.
Make a crease.
Supporting
tape side
B
Should be confirmed that wire
not touch to IC of the Stator
board assembly.
After attach the Mechanism assembly,
treat the wire according to the figure.
The
21 , 22
wires
should be treat under the
P/R MDA board assembly.
CN1502
CN3501
CN1101
CN3701
CN1001
CN5505
CN5503
CN5504
CN5507
CN5506
CN5501
CN5502
CN5001
CN5002
CN2001
CN5323
(Middle)
CN5324
(Upper)
CN3011CN7507
CN1501
CN1002
CN1
CN3014
CN3011
CN7507
B
DRUM
Main board
assembly
Main board
assembly
Main board
assembly
Chassis
Absorb the looseness of
the wire in the B part.
Treat the front wires
according to the figure.
Treat the wire
through the hole.
DETALE "B"
DETALE "A"DETALE "C"
Base(1)
[CAUTION]
Insert the FPC wires as shown below.
Foil sideSupperting tape side side
TOP VIEW
Fig. 1-10-1 Top view
1-11
Fig.
No.
Symbol
Connection
Pin No.
Connected point←→ Connected point
Type
(FPC/
WIRE)
1WR1MAINCN7507←→JACKCN700216FPC
2WR2MAINCN3011←→DISPLAYCN700118FPC
3WR3REGULATORCN5301←→SW REGCN520119FPC
4WR4REGULATORCN5322←→MAINCN750813FPC
5WR5REGULATORCN5321←→MAINCN750915FPC
6WR6REGULATORCN5325←→FAN MOTOR–2WIRE
7WR7REGULATORCN5324←→PRE/REC MDACN55015WIRE
8WR8REGULATORCN5323←→DV MAINCN100110WIRE
9WR9DRUM MOTORCON1←→MAINCN30015FPC
10WR10MAINCN1←→UPPER DRUM–13FPC
11WR11A/C HEADCN1←→MAINCN20017FPC
12WR12MAINCN3014←→DV MAINCN10026FPC
13WR13MAINCN703←→DV MAINCN35016WIRE
14WR14MAINCN2601←→DV MAINCN37018FPC
15WR15DV MAINCN1502←→SENSOR–15FPC
16WR16PRE/REC MDACN5002←→DV MAINCN200126FPC
17WR17PRE/REC MDACN5506←→DV MAINCN150120FPC
18WR18PRE/REC MDACN5507←→DV HOUSING MOTOR–4WIRE
19WR19PRE/REC MDACN5502←→DV LOADING MOTOR–2WIRE
20WR20PRE/REC MDACN5505←→DV ENCODER–4WIRE
21WR21PRE/REC MDACN5503←→DV DRUM MOTOR–11FPC
22WR22PRE/REC MDACN5504←→DV CAPSTAN MOTOR–18FPC
23WR23PRE/REC MDACN5001←→DV VIDEO HEAD–10FPC
24–MAINCN7506←→S-SUBCN51214FPC
––DV MAINCN1101←→Jig CONN. CABLE–26–
Table 1-10-1 Connection
1-12
1.11EMERGENCY DISPLAY FUNCTION
Example 1 E : 01 :
03
Previous emergency
Latest emergency
No emergency record
Example 2E : –– :
––
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.
FDP display switching
[DV]
FDP display – : –– : –– Normal display
: **Emergency content display
E :
**
E :
**
[VHS]
FDP display
Notes:
•
The emergency detail display
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.
Jig RCU
[Data transmitting method]
Depress the “ ” ( 3 ) button
after the data code is set.
0 : 00 : 00
E: **:
1: *2 : 34
*
5: *6 :
*
CUSTOM CODE
43: A CODE
53: B CODE
DATA CODE
Fig. 1-11-1 Jig RCU [PTU94023B]
(E:Latest:Previous)
: **Emergency content display
(E:Latest:Previous)
Normal display
Emergency content display
**
(E:Latest:Previous)
Emergency detail display
Emergency detail display
7
*
1 2
show the information
INITIAL MODE
1
2
1.11.1 Displaying the emergency information
(1) Transmit the code “59” from the Jig RCU.
The FDP shows the emergency content in the form of
:**”.
“E:
**
Note:
[DV]
For the emergency content, see “1.11.3 Emergency content description”.
[VHS]
For the emergency content, see “1.11.3 Emergency content description”.
(2) Transmit the code “59” from the Jig RCU again.
The FDP shows the emergency detail information 1 in the
form of “
*
*
3 – : Mechanism sensor information at the moment of
– 4 : Mechanism mode position at the moment of emer-
Note:
•
For the emergency detail information
Emergency detail information
(3) Transmit the code “59” from the Jig RCU once again.
The FDP shows the emergency detail information 2 in the
form of “
*
*
*
Note:
•
For the emergency detail information 2 , see “1.11.5 Emergency detail information
1 : *2 : 34”.
*
1 : Deck operation mode at the moment of emergency
2 : Mechanism operation mode at the moment of emer-
gency
emergency
gency
1
, see “1.11.4
1
”.
5 : *6 :
*
5 : Type of the cassette tape in use 1 .
7 ”.
*
6 : Winding position of the cassette tape in use
7 : Type of the cassette tape in use 2 (Winding area)
2
”.
(4) Transmit the code “59” from the Jig RCU once again to re-
set the display.
1.11.2 Clearing the emergency history
(1) Display the emergency history.
(2) Transmit the code “36” from the Jig RCU.
(3) Reset the emergency display.
(Y292-03e)
1-13
1.11.3 Emergency content description
Emergency contents “E08/E09” are for the model with Dynamic Drum (DD).
Note:
FDPCONTENTCAUSE
E01: Loading EMG
E02:
Unloading EMG
E03: Take Up Reel
Pulse EMG
E04: Drum FG
EMG
E05: Cassette Eject
EMG
E06: Capstan FG
EMG
E07: SW Power
Short-Circuit
EMG
E08:
DD Initialized
(Absolute
Position
Sensor)
EMG
E09: DD FG EMG
E0A:Supply Reel
Pulse EMG
EC1 or EU1:
Head clog warning
When the mechanism mode cannot be changed to another 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 another 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 identified, the pinch rollers are turned off and stopped, and
the power is turned off.
When the eject operation does not complete in 3 seconds 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 seconds, [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.
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.
The mechanism is locked in the middle of mode transition.
1
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 position 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;
The idler gear is meshed with the take-up reel gear, but incapable of wind-
2)
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;
The tape is damaged or a foreign object (grease, etc.) adheres to the tape.
2)
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 temperature, 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.
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.
The absolute value sensor data is not sent to the System Controller CPU.
4
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.
The tilt motor is defective. (The soldered parts have separated.)
6
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.
The supply reel pulse is not generated in the FWD transport mode (PLAY/
1
FWD SEARCH/FF, etc.) because;
1) PLAY/FWD or SEARCH/FF is started while the tape in the inserted cassette 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.
1-14
Table 1-11-1
1.11.4 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 .
[FDP display]
1 : *2 : 34
*
1 : Deck operation mode at the moment of emergency
*
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:
•
In the Deck operation mode/Mechanism operation mode/
Mechanism mode position, the contents of the code that
is shown on the FDP differs depending on the parts
number of the System Control microprocessor (IC3001)
of the VCR.
For the microprocessor parts number that starts with the
two letters “MN”, refer to the Table of MN and for parts
number with “HD”, refer to the Table of HD.
2: Mechanism Operation Mode
*
[Table of MN]
Display
00Command standby (Status without executing command)
02POWER OFF by EMG occurrence
04Moving to the adjacent position in the LOAD direction
06Moving to the adjacent position in the UNLOAD direction
08Cassette ejection being executed
0ACassette insertion being executed
0CTape being loaded
0ETape being unloaded
10Mode transition to STOP with pinch roller compression ON
12Mode transition to STOP with pinch roller compression OFF
14Mode transition to STOP with pinch roller compression OFF as a result
of POWER OFF
16Mode transition to STOP with pinch roller compression ON as a result of
POWER ON
18Mode transition to PLAY
1AMode transition to FWD SEARCH
1CMode transition to REC
1EMode transition to FWD STILL/SLOW
20Mode transition to REV STILL/SLOW
22Mode transition to REV SEARCH
24Mode transition from FF/REW to STOP
26Mode transition to FF
28Mode transition to REW
2A4 sec. of REV as a result of END sensor going ON during loading
2CShort FF/REV as a result of tape sensor going ON during unloading
2EMechanism position being corrected due to overrun
80Mechanism in initial position (Dummy command)
Mechanism Operation Mode
1: Deck Operation Mode
*
[Table of MN]
Display
00Mechanism being initialized
01STOP with pinch roller pressure off (or tape present with P.OFF)
02STOP with pinch roller pressure on
03POWER OFF as a result of EMG
04PLAY
0CREC
10Cassette ejected
20FF
21Tape fully loaded, START sensor ON, short FF
22
Cassette identification FWD SEARCH before transition to FF (SP x7-speed)
24FWD SEARCH (variable speed) including x2-speed
2CINSERT REC
40REW
42
Cassette identification REV SEARCH before transition to REW (SP x7-speed)
44REV SEARCH (variable speed)
4CAUDIO DUB
6CINSERT REC (VIDEO + AUDIO)
84FWD STILL/SLOW
85REV STILL/SLOW
8CREC PAUSE
8DBack spacing
8EForward 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
Deck Operation Mode
[Table of HD]
Display
00STOP with pinch roller pressure off (or tape present with P.OFF)
01STOP with pinch roller pressure on
04PLAY
0EREC
11Cassette ejected
22FF
26FWD SEARCH (variable speed) including x2-speed
2EINSERT REC
43REW
47REV SEARCH (variable speed)
4CAUDIO DUB
6EINSERT REC (VIDEO+AUDIO)
84FWD STILL/SLOW
85REV STILL/SLOW
8FREC PAUSE
AFINSERT REC PAUSE
CD AUDIO DUB PAUSE
EFINSERT REC (VIDEO+AUDIO) PAUSE
Deck Operation Mode
[Table of HD]
Display
00STOP with pinch roller pressure off
01STOP with pinch roller pressure on
02U/L STOP (or tape being loaded)
04PLAY
05PLAY (x1-speed playback using JOG)
0EREC
11Cassette ejected
22FF
26FWD SEARCH (variable speed) including x2-speed
2EINSERT REC
43REW
47REV SEARCH
4CAUDIO DUB
6EINSERT REC (VIDEO + AUDIO)
84FWD STILL/SLOW
85REV STILL/SLOW
8FREC PAUSE
AFINSERT REC PAUSE
C7REV SEARCH (x1-speed reverse playback using JOG)
CD AUDIO DUB PAUSE
EFINSERT REC (VIDEO + AUDIO) PAUSE
F0Mechanism being initialized
F1POWER OFF as a result of EMG
F2Cassette being inserted
F3Cassette being ejected
F4Transition from STOP with pinch roller pressure on to STOP with pinch
roller pressure off
F5Transition from STOP with pinch roller pressure on to PLAY
F6Transition from STOP with pinch roller pressure on to REC
F7Cassette type detection SEARCH before FF/REW is being executed
F8Tape being unloaded
F9Transition from STOP with pinch roller pressure off to STOP with pinch
roller pressure on
FATransition from STOP with pinch roller pressure off to FF/REW
FBTransition 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
FETension loosening being executed after tape loading (STOP with pinch
Tape being loaded/unloaded (When the pole base is located on the front
side of the position just beside the drum)
-5Tape being loaded/unloaded (When the pole base is located on the rear
side of the position just beside the drum)
-6Pole base compressed position
-7FF/REW position
-8Between FF/REW and STOP with pinch roller compression ON
-9STOP 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
-FPLAY position
Mechanism Mode Position
[Table of HD]
Display
–0EJECT position
–1U/L STOP position
–2Tape being loaded/unloaded (When the pole base is located on the rear
side of the position just beside the drum)
–3FF/REW position
–4STOP with pinch roller pressure off
–5REV (REV STILL/SLOW) position
–6FWD (FWD STILL/SLOW) position, PLAY position
–7Intermediate position during transition between other mechanism modes
Mechanism Mode Position
Note:
•
As the display is always “–7” at any intermediate position
between mechanism modes, the position of transitory
EMG may sometimes not be locatable.
1-16
1.11.5 Emergency detail information 2
The type of the cassette tape and the cassette tape winding position can be confirmed based on the figure in EMG detail information 2 .
[FDP display]
5 : *6 :
*
*
*
*
Note:
•
EMG detail information2 is the reference information
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)
stored using the remaining tape detection function of the
cassette tape. As a result, it may not identify cassette correctly when a special cassette tape is used or when the
tape has variable thickness.
5: Cassette tape type 1
*
DisplayCassette Tape Type 1
00Cassette type not identified
16
Large reel/small reel (T-0 to T-15/T-130 to T-210) not classified
82Small reel, thick tape (T-120) identified/thin tape (T-140) identified
84Large 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
E1C cassette, thick tape (TC-10 to TC-20) identified
E2Small reel, thick tape (T-0 to T-100) identified
E9C cassette, thin tape (TC-30 to TC-40) identified
F1
C cassette, thick tape/thin tape (TC-10 to TC-40) not classified
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 table is displayed,
the cassette tape type is not identified.
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
C cassette, thick tapeTC-20P
Small reel, thick tapeT-20
C cassette, thin tapeTC-30
C cassette, thin tapeTC-40
Small reel, thick tapeT-40
Small reel, thick tapeT-60
Small reel, thick tapeT-80/DF-160
Small reel, thick tapeT-80/DF-180
Small reel, thick tapeT-100
Small reel, thick tapeT-120/DF-240
Small reel, thin tapeT-140
Small reel, thick tapeT-130
Small reel, thin tapeT-160
Small reel, thin tapeT-168
Small reel, thick tapeDF-300
Small reel, thin tapeT-180/DF-380
Small reel, thin tapeT-210/DF-420
Large reelT-5
Large reelT-10
Large reelT-20
Large reelT-30
Large reelT-40
Large reelT-60
0A - 0B
0D - 0F
19 - 1D
1D - 21
1E - 1F
2D - 2F
Note:
•
The values of cassette tape type 2 in the above table are
typical values with representative cassette tapes.
SECTION 2
MECHANISM ADJUSTMENT (VHS)
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 neglected 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 operate the mechanism when no cassette is loaded. (See 1.5
MECHANISM SERVICE MODE.)
Loading motor
Pole base assembly
2.1.3 Manually Removing the Cassette Tape
1. In case of electrical failures
If you cannot remove the cassette tape which is loaded because 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 DISASSEMBLY/ASSEMBLY METHOD.)
(2) Unload the cassette by manually turning the loading mo-
tor 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.)
(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. Likewise 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.)
(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. 2-1-3a
C
A
B
Press
Fig. 2-1-3b
2-1
2. In case of mechanical failure
If you cannot remove the cassette tape which is loaded because of any mechanical failure, manually remove it by taking the following steps.
(1) Unplug the power cable and remove the top cover, front
panel assembly and others so that the mechanism assembly 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.2-1-3c.)
(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(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.
Pole base assembly (take-up side)
2.1.4 Jigs and Tools Required for Adjustment
Roller driver
PTU94002
Back tension cassette gauge
PUJ48076-2
Alignment tape
(SP, stairstep, PAL)
MHPE
A/C head positioning tool
PTU94010
Jig RCU
PTU94023B
Alignment tape
(LP, stairstep, PAL)
MHPE-L
Torque gauge
PUJ48075-2
Pole base assembly
(supply side)
Tension arm assembly
Fig. 2-1-3c
Take the spring
off the hook, and
detach it from the
tape.
Guide pole guard
2-2
Pinch roller arm assembly
Press lever assembly
Fig. 2-1-3d
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”.
UV catcher2 (supply and take-up side)
Stator assembly
T2
Full erase head
T26
Pole base assembly
T25
(supply side)
Tension arm
T24
assembly
Adjust pin
T23
Tension brake
T22
assembly
T1
T3
Drum assembly
T5T7
T6
Head base
Audio control head
Loading motor
Guide pole guard
T8
Pinch roller arm
T9
assembly
Lid guide
T10
Press lever
T11
assembly
Guide arm
T12
assembly
Reel disk
T13
(take-up side)
Sub brake assembly
T14
(take-up side)
Belt
B22
(loading motor)
B21
Control cam
B20
B19
Cassette gear
B18
Worm gear
Brake lever
Rec safety lever
B1
Reel disk
T20
(supply side)
Main brake assembly
(supply side)
Idler lever
T17T19T21
Idler arm assembly
T16T18
Pole base assembly (take-up side)
Fig. 2-1-5a Mechanism assembly top side
Capstan motor
Belt (capstan)
B2
Capstan brake assembly
B3B5
Loading arm gear (take-up side)
B4
Loading arm gear (supply side)
Main brake assembly
T15
(take-up side)
Plate
B6
(supply side)
Control
B7
bracket1
Control plate
B8
Tension arm
B9
bearing
Link lever
B17
Rotary encoder guide
B16
Rotary encoder
B15
B14
Direct gear
B13
Change lever assembly
B12
B10
Clutch unit
Take-up head
Fig. 2-1-5b Mechanism assembly bottom side
Take-up lever
B11
2-3
Guide railRoller cam assembly
L2L1
Fig. 2-1-5c Mechanism assembly left side
R1
Opener guide
Door
R2
opener
Drive gear
R3
Cassette housing bracket
R4
R5
Limit gear
Loading motor
Worm gear
Belt (loading motor)
Fig. 2-1-5d Mechanism assembly right side
2. Cleaning
Regular cleaning of the transport system parts is desirable
but practically impossible. So make it a rule to carry out cleaning 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 disappear, 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 lubricate 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.
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 indicated 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.
SystemParts Name
Upper drum assembly
A/C head
Lower drum assembly
Pinch roller arm assembly
Full erase head
Tension arm assembly
Capstan motor (Shaft)
Guide arm assembly
Capstan motor
Capstan brake assembly
Main brake assembly
Belt (Capstan)
Belt (Loading motor)
Loading motor
Clutch unit
Worm gear
Control plate
Brush
Tension brake assembly
OtherDriveTape transport
Rotary encoder
: Cleaning
¤
: Inspection or Replacement if necessary
R
Operation Hours
~1000H~2000H
¤RR
¤R¤R
¤¤R
¤¤
¤¤
¤¤
¤¤
¤¤
R
R
R
RR
R
R
R
R
R
¤R¤R
RR
R
Table 2-1-5a
5. Disassembling procedure table
The following table indicates 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 symbols and numbers preceding the individual part
names represent the numbers in the “Location 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.
• The parts with marked (
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.
*
) have different types of mecha-
*
T1
Drive arm
Pinch roller arm assembly
Guide arm assembly
Press lever assembly
UV catcher2
Rotary encoder
1
2
1
1
1
12
12
1 2 3 4 5
12
3 4
1 2 3 4
1 2 3 4 5
1 2 3 4 5 6
1 2 3 4 5 6 7
1 2 3 4 5 6
1 2 3 4 5 6
1 2 3 4 5 6
1 2 3 4 5 6
9 10 1112 13 14
9 10 1112 13 14 15
9 10 1112 13 14 15
9 10 1112 13 14 15 16
9 10 1112 13 14 15 16 17
9 10 1112 13 14 15 16 17
9 10 1112 13 14 15 16 17 18
Clutch unit
Change lever assembly
Direct gear
Clutch gear
Link lever
2
3
3
4
1
1
Worm gear
Control bracket1
Control plate
5
6
7
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
8
7
7
9
9
9
)
1
*
(
Idler lever
Brake lever
2-5
g
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 mechanical 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 positions.
Especially, this model is not provided with any cassette housing assembly, so that cassette loading and unloading must
be accomplished by operation of the cassette holder assembly. The latter is in turn driven by such parts as the drive
gear, relay gear and limit gear. Exercise enough care, therefore, to have the phases of all this gear matching one another. (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.
2.2.3 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)
Guide rail
Lugs
Roller cam
assembly
Lug
Lug
Fig. 2-2-3a
(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.)
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 assembly chassis. This position renders the mechanism assembling mode operational. Make sure that the control plate is
located in alignment with the mark E. (See Fig.2-2-2a.)
Worm gear
Chassis hole
Guide hole
Control cam
Limit gear
Spring(A)
Opener guide
Relay gear
Door opener
Cassette housing bracket
Slit washers
Fig. 2-2-3b
(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.)
Lock lever (L)
Cassette holder assembly
Drive arm
(Upright)
2-6
Control plate
Fig. 2-2-2a
Mark E
Le
Fig. 2-2-3c
Legs
While holding the left side of the cassette holder, lift the
A
B
C
Cassette holder assembly
Drive arm
Lock lever (R)
Cassette holder assembly
(5)
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.
Cassette holder assembly
Fig. 2-2-3d
Cassette holder assembly
A
2. How to install (Phase matching)
A
(1) Insert the section
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.
Fig. 2-2-3e
Main deck right side
Drive arm
Hole
B
C
Drive arm
Fig. 2-2-3g
Hole
Drive gear
1
2
A
B
Fig. 2-2-3h
Fig. 2-2-3f
2-7
Relay gear
B
Guide holeNotchesNotch
2.2.6 Audio Control Head
1. How to remove
(1) Remove the two screws (A) and remove the audio con-
trol head together with the head base.
(2) When replacing only the audio control head, remove the
three screws (B) while controlling the compression spring.
Head base
B
AA
Drive gearLimit gear
Fig. 2-2-3i
2.2.4 Pinch Roller Arm Assembly
1. How to remove
(1) Remove the spring from the hook of the press lever as-
sembly.
(2) Remove the slit washer and remove the pinch roller seat
2. (See Fig.2-2-4a.)
(3) Remove the pinch roller arm assembly by pulling it up.
Slit washer
Pinch roller seat2
Spring
Pinch roller arm
Press lever assembly
Pinch roller arm assembly
assembly
Fig. 2-2-4a
2.2.5 Guide Arm Assembly and Press Lever Assembly
1. How to remove
(1) Remove the spring and expand the lug of the lid guide in
the arrow-indicated direction. Then remove the guide arm
assembly by pulling it up.
(2) Remove the press lever assembly by pulling it up. (See
Fig.2-2-5a.)
Screws(A)
Audio control head
Fig. 2-2-6a
Screws(B)
Audio control head
Compression
Audio control head
board assembly
Head base
springs
Fig. 2-2-6b
2. How to install
(1) To make the post-installation adjustment easier, set the
temporary level as indicated in Fig.2-2-6c. Also make sure
that the screw center (centre) is brought into alignment
with the center (centre) position of the slot.
A/C head
12.4 mm
Head base
Screw
2-8
Tension
spring
LugLid guide
Fig. 2-2-5a
Press lever
assembly
Guide arm
assembly
Head base
Audio control head
Fig. 2-2-6c
2.2.7 Loading Motor
1. How to remove
(1) Remove the belt wound around the worm gear.
(2) Open the two lugs of the motor guide and remove the
loading motor, loading motor board assembly and motor
guide altogether by pulling them up.
(3) When replacing the loading motor board assembly, take
care with the orientation of the loading motor. (Install so
that the loading motor label faces upward.)
(4) When the motor pulley has been replaced, choose the
fitting dimension as indicated in Fig.2-2-7a.
Loading motor board assembly
Loading motor
Lugs
Motor guide
6.5 ± 0.2 mm
LABEL
Motor pulley
Worm gear
Belt
Fig. 2-2-7a
2.2.8 Capstan Motor
1. How to remove
(1) Remove the belt (capstan) on the mechanism assembly
back side.
(2) Remove the three screws (A) and remove the capstan
motor.
Screws(A)
Screw(A)
Capstan motor
Belt
Fig. 2-2-8a
Spacer
Spacer
2. How to install (Centering the mounting position)
When the capstan motor has once been removed and then
reinstalled out of the initial correct position in the rotational
direction, the capstan motor current may be unstable during
operation in high or low temperatures. This may result in
greater Wow & Flutter and occasionally in power breakdown
because of current over - load. Install the capstan motor while
following the procedure given below.
(The capstan motor is centrally located when the unit is
shipped from the factory.)
(1) Provisionally tighten the three screws (A) securing the
capstan motor.
(2) Install the mechanism assembly to which the capstan
motor is provisionally fastened on the bottom chassis
which incorporates the Main board assembly. (No need
to tighten the screws for mounting the mechanism.)
Make sure that all the connectors for the mechanism assembly and the Main board assembly are correctly installed as indicated in Fig. 2-2-8b.
(3) Making sure that the connector for the capstan motor is
correctly mounted, and securely tighten the three screws
(A).
Note:
• When the capstan motor has been replaced with a new
one, perform recording in the EP(or LP) mode for at
least 2 minutes at normal temperatures immediately before starting the FF/REW or SEARCH operations (Aging).
2.2.9 Pole Base Assembly (supply or take-up side)
1. How to remove
(1) Remove the UV catcher 2 on the removal side by loos-
ening the screw (A).
(2) Remove the pole base assembly on the supply side from
the mechanism assembly by loosening the screw (B) on
the mechanism assembly back side and sliding the pole
base assembly toward the UV catcher 2.
(3) As for the pole base assembly on the take-up side, turn
the pulley of the loading motor to lower the cassette
holder because the screw (B) is hidden under the control plate. (See the “Procedures for Lowering the Cassette
holder assembly” of 1.3 DISASSEMBLY/ASSEMBLY
METHOD.) Further turn the motor pulley to move the cassette holder until the screw (B) is no longer under the control plate (in the half-loading position). Then remove it as
done for the supply side by removing the screw (B).
Note:
• After reinstalling the Pole base assembly and the UV
catcher2, be sure to perform compatibility adjustment.
Fig. 2-2-8b
Connector for
the capstan motor
Screw(A)
UV catcher2
Screw(A)
UV catcher2
Screw(B)
Fig. 2-2-9a
2-9
2.2.10 Rotary Encoder
1. How to remove
(1) Remove the screw (A) and remove the rotary encoder
by pulling it up. (See Fig. 2-2-10a.)
Rotary encoder (Front side)
Screw(A)
Guide marks
2.2.12 Change Lever Assembly, Direct Gear, Clutch
Gear and Coupling Gear
1. How to remove
(1) Release the two lugs of the rotary encoder guide in the
arrow-indicated direction and remove the change lever
assembly.
(2) Remove the slit washer retaining the direct gear and re-
move the latter.
Take care so as not to lose the washer and spring. (See
Fig.2-2-12a.)
Rotary encoder (Back side)
Positioning pin of the rotary encoder
Fig. 2-2-10a
Mark E
Shaft of the rotary encoder guide
Control plate
Fig. 2-2-10b
2. How to install (Phase matching)
(1) Make sure that the mark E of the control plate is in align-
ment with the mark
of the loading arm gear shaft and
bring the guide marks on the rotary encoder into alignment as indicated in Fig.2-2-10a. (See Fig. 2-2-10a and
Fig. 2-2-10b.)
(2) Turn over the rotary encoder with its guide marks kept in
alignment and install it by fitting on the shaft of the rotary
encoder guide and the positioning pin.
(3) Tighten the screw (A) to complete the installation.
2.2.11 Clutch Unit
(1) Remove the belt wound around the capstan motor and
the clutch unit.
(2) Remove the slit washer and remove the clutch unit.
Change lever
assembly
Spring(B)
Lugs
Note:
• The parts with marked (
speed FF/REW type).
1 : Uses the standard type mechanism only.
*
2:
Uses the high-speed FF/REW type mechanism only.
*
Slit washer
Washer (*1)
Spacer
Direct gear
Spring(A)
Position the projecting
side down.
1)
Spacer (
*
) have different types of mechanisms (standard type or high-
*
Clutch gear
Spring (C)
Coupling gear (
2)
*
Fig. 2-2-12a
2. How to install
(1) Install the clutch gear, spring (A), spring (C), direct gear,
spacer and others to the individual shafts of the main
deck, and finally the slit washer. (See Fig.2-2-12a.)
(2) Let the spring (B) drops into the rotary encoder guide hole
and install the change lever assembly.(Take care not to
mistake a direction of the spring.) The point is to slightly
lift the clutch gear and catch it from the both sides with
the assembly. (See Fig.2-2-12b.)
Rotary encoder guide
Spring(B)
Change lever assembly
Clutch gear
2-10
Belt
Clutch unit
Fig. 2-2-11a
Slit washer
Main deckMain deck
Fig. 2-2-12b
2.2.13 Link Lever
1. How to remove
(1) Remove the two slit washers.
(2) Remove the link lever by lifting it from the shaft retained
by the slit washers. Then swing the link lever
counterclockwise and remove it from the locking section
of the control plate.
Slit washers
2.2.14 Cassette Gear, Control Cam and Worm Gear
1. How to remove
(1) Remove the control cam by lifting it.
(2) Open the two lugs of the cassette gear outward and pull
the latter off.
(3) Remove the belt wound around the worm gear and the
loading motor.
(4) Open the lug of the lid guide outward and remove the
worm gear.
Link lever
Locking section of the
control plate
Fig. 2-2-13a
2. How to install (Phase matching)
(1) Slide the control plate so that its mark E is aligned with
the mark
on the loading arm gear shaft. (See Fig.2-2-
13b.)
(2) Rotate the worm gear until the guide hole of the control
cam is aligned exactly with the guide hole of the main
deck. (See Fig.2-2-13c.)
(3) Insert the link lever into the locking section of the control
plate. (See Fig.2-2-13a.)
(4) Rotate the link lever clockwise so that it is installed on
the shafts in the center (centre) and on the left of the control cam.
(5) Fasten the slit washers at these two points.
Loading motor
Belt
Lug
Worm gear
Lugs
Cassette gear
Lid guide
Control cam
Fig. 2-2-14a
2.2.15 Control Plate
1. How to remove
(1) Remove the screw (A) retaining the control bracket 1 and
remove the latter.
(2) Slide the control plate as indicated by the arrow and re-
move the control plate. (See Fig.2-2-15a.)
Shaft of the rotary encoder guide
Fig. 2-2-13b
Worm gear
Main deck
guide hole
Control cam
guide hole
Cassette gear
Fig. 2-2-13c
Control plate
Control cam
Mark E
Screw(A)
Control
bracket1
Control
plate
Fig. 2-2-15a
2. How to install (Phase matching)
(1) Adjust the position of the idler arm assembly pin as indi-
cated in Fig.2-2-15b (to the left of center (centre) of the
R section).
(2) Bring the guide hole of the take-up lever into alignment
with the hole at the control plate guide and fix the position by inserting a 1.5 mm hexagonal wrench.
2-11
(3) Install the control plate so that the section A of the load-
ing arm gear shaft fits into the hole (A) of the control plate,
the section B of the control plate guide into the hole (B),
and the control plate comes under the section C of the
rotary encoder guide and the section D of the loading arm
gear shaft while press-fit the pole base assmebly (supply side) as indicated by the arrow. It is important that
the tension arm assembly shaft is positioned closer toward you than the control plate. (See Fig.2-2-15c.)
(4) Make sure that the mark E of the control plate is in align-
ment with the mark
of the loading arm gear shaft. (See
Fig.2-2-15c.)
(5) Pull off the hexagonal wrench for positioning.
(3) Turn the loading arm gear (take-up side) clockwise so
that the notch of the loading arm gear (take-up side) is
in alignment with the projection of the loading arm gear
shaft and lift it.
Likewise, turn the loading arm counterclockwise so that
the notch is in alignment with the projection and remove
the loading arm gear (take-up side). (See Fig.2-2-16a and
Fig. 2-2-16b.)
(4) When removing the loading arm gear shaft, be sure of
first removing the screw retaining the drum assembly (on
the back side of the loading arm gear shaft). Then remove the screw (C) and remove the loading arm gear
shaft by sliding it.
Idler arm assembly
pin
R section
Guide hole of the
control plate guide
Section D
1.5mm hexagonal wrench
Fig. 2-2-15b
Section A
Section D
Hole A
Pressfit
Insert
Take-up lever
Pole base assembly
(supply side)
Section A
Hole A
Pole base assembly
(take-up side)
Screw(B)
Torsion arm
Loading arm gear
(take-up side)
Projection B
Guide marks
Projection A
Pole base assembly
(supply side)
Screw(A)
Loading arm gear
(supply side)
Fig. 2-2-16a
Loading arm gear shaft
Loading arm gear (take-up side)
Notch
Screw(C)
Loading arm gear shaft
Section C
Section C
Section B
Hole B
Hole B
Section B
Control plate
Tension arm assembly
shaft
Fig. 2-2-15c
2.2.16 Loading Arm Gear (supply or take-up side) and
Loading Arm Gear Shaft
1. How to remove
(1) Remove the loading arm gear (supply side) by loosen-
ing the screw (A). (See Fig. 2-2-16a.)
(2) Remove the screw (B) and remove the torsion arm from
the pole base assembly (take-up side). (See Fig.2-2-16a.)
2-12
Fig. 2-2-16b
2. How to install
(1) Align the notch of the loading arm gear (take-up side) to
the projection B of the loading arm gear shaft and slip it
over. Then rotate it clockwise for alignment with the projection A and slip it down to the bottom. (See Fig.2-216b.)
(2) Then turn the loading arm gear (take-up side)
counterclockwise. Hang the torsion arm on the pole base
assembly (take-up side) and tighten the screw (B).
(3) Install the loading arm gear (supply side) so that the guide
mark of the loading arm gear (take-up side) is in alignment with the guide mark of the loading arm gear (supply side). Then hang the torsion arm on the pole base
assembly (supply side) and tighten the screw (A). (See
Fig.2-2-16a.)
2.2.17 Take-up Lever, Take-up Head and Control Plate
Lug(D)
Lug(C)
SpringLug(E)
Lug(A)
Lug(B)
Main brake assembly
(take-up side)
Reel disk
(take-up side)
Main brake assembly
(supply side)
Notch
Guide
(1) Remove the spring of the take-up lever from the main
deck.
(2) Remove the lug (A) of the take-up lever from the main
deck and pull out the take-up lever and the take-up head
together.
(3) Remove the screw (A).
(4) Align the idler arm assembly pin in the center (centre) of
the R section of the control plate guide, remove the con-
trol plate guide lugs (B) and (C) from the main deck, and
remove the control plate guide.
Idler arm assembly pin
Lug(C)
Screw(A)
Take-up lever
Take-up head
Lug(A)
Lug(B)
Control plate guide
Fig. 2-2-17a
2.2.18 Capstan Brake Assembly
1. How to remove
(1) Move the lug (A) of the capstan brake assembly in the
arrow-indicated direction so that it comes into alignment
with the notch of the main deck. (See Fig. 2-2-18a.)
(2) Remove the lug (B) of the capstan brake assembly from
the main deck and remove the capstan brake assembly.
Spring
Sub brake
Lug(A)
Lug(B)
assembly
(take-up side)
Lug(C)
Fig. 2-2-19a
2.2.20 Main Brake Assembly (take-up side), Reel Disk
(take-up side) and Main Brake Assembly (supply side)
1. How to remove
(1) Move the main brake assembly (take-up side) in the ar-
row-indicated direction and remove the reel disk (takeup side).
Remove the spring attached to the main brake assembly.
(2)
(3) Remove the lug (A) of the main brake assembly (take-
up side) and pull out the lug (B) after bringing it into alignment with the main deck notch.
(4) Remove the lugs (C), (D) and (E) of the main brake as-
sembly (supply side) from the main deck and pull them
off. (See Fig.2-2-20a.)
(5) When installing the main brake assembly (take-up side),
slide the brake lever in the direction as indicated by the
arrow to prevent it from hitting the projection of the main
brake assembly (take-up side). (See Fig.2-2-20b.)
Lug(B)
Lug(A)
Capstan brake assembly
Fig. 2-2-18a
2.2.19 Sub Brake Assembly (take-up side)
1. How to remove
(1) Remove the spring attached to the lid guide and sub
brake assembly (take-up side).
(2) Bring the lug (A) of the sub brake assembly (take-up side)
into alignment with the notch of the main deck.
(3) Remove the lugs (B) and (C) of the sub brake assembly
(take-up side) from the main deck and remove the sub
brake assembly (take-up side).
Fig. 2-2-20a
(
1)
*
Brake
lever
Note:
• The parts with marked ( *) have different types of mechanisms (standard type
or high-speed FF/REW type).
1 : Uses the standard type mechanism only.
*
Rotary encoder guide
Projection of the main
brake assembly
(take-up side)
Fig. 2-2-20b
2-13
2.2.21 Tension Brake Assembly, Reel Disk (supply side)
(
)
and Tension Arm Assembly
1. How to remove
(1) Remove the three lugs of the tension brake assembly
from the main deck and pull them off.
(2) Remove the reel disk (supply side) by loosening in the
arrow-indicated direction the main brake assembly (supply side).
(3) Remove the tension spring on the back of the main deck.
Then release the lug of the tension arm bearing in the
arrow-indicated direction and draw out the tension arm
assembly. (See Fig. 2-2-21a.)
Lug of the tension
arm bearing
Tension arm
assembly
Reel disk
(supply side)
2.2.23 Stator Assembly
(1) Remove the flat cable.
(2) Remove the two screws (A).
(3) Remove the stator assembly by lifting in the arrow-indi-
cated direction. (Take care that the brush spring does not
jump out.)
(4) After installation, be sure to perform the PB switching
point adjustment according to the electrical adjustment
procedure.
Screws(A)
Tension brake
assembly
Lugs
Tension springMain brake assembly
supply side
Fig. 2-2-21a
2.2.22 Idler Lever, Idler Arm Assembly
1. How to remove
(1) Remove the lug of the idler lever from the main deck and
remove the hook fitted in the idler arm assembly hole by
lifting it.
(2) Remove the slit washer and pull out the idler arm assem-
bly.
LugIdler lever
Stator assembly
Flat cable
(Take care not to mix up the
polar faces when installing.)
Fig. 2-2-23a
2.2.24 Rotor Assembly
(1) Remove the stator assembly.
(2) Remove the two screws (B) and remove the rotor assem-
bly.
Note:
• When installing the rotor assembly, note that a normal
picture cannot be obtained without ensuring the phase
matching as mentioned below.
(3) Match the phases of the upper drum assembly and the
rotor assembly as indicated in Fig.2-2-24a.
(4) Place the upper drum assembly hole (a) over the rotor
assembly holes (b) (with three holes to be aligned) and
tighten the two screws (B). (See Fig.2-2-24a.)
2-14
Fig. 2-2-22a
Hook
Idler arm
assembly
Slit washer
Screws (B)
Screw holes
Upper drum
assembly
Rotor assembly
Fig. 2-2-24a
Hole(a)
The hole is not in
line but is offset
toward the right.
Hole(b)
2.2.25 Upper Drum Assembly
1. How to remove
(1) Remove the stator assembly and rotor assembly.
(2) Loosen the screw of the collar assembly using a 1.5 mm
hexagonal wrench and remove the collar assembly. Also
remove the brush, spring and cap at one time.
(3) Remove the upper drum assembly and remove the
washer using tweezers.
Note:
• When replacement is required, control the up- down
movement of the brush. Never apply grease.
Lower drum assembly
Coil parts
Upper drum assembly
Spring
Brush
Upper drum
assembly
Washer
Collar
assembly
Loosen
Cap
Shaft
1.5 mm
hexagonal wrench
Lower drum assembly
Fig. 2-2-25a
2. How to install
(1) Clean the coil parts of the lower drum assembly and the
newly installed upper drum assembly with an air brush
in advance. (See Fig.2-2-25b.)
(2) Install a new washer and upper drum assembly on the
drum shaft. (See Fig.2-2-25a.)
Note:
• When replacing the upper drum assembly, replace it
the together with the washer.
(3) Install the cap to the upper drum assembly.
(4) Position the collar assembly as indicated in Fig.2-2-25c
while controlling its up- down movement.
(5) Secure the collar assembly in position with a hexagonal
wrench while pressing its top with the fingers.
(6) After installation, gently turn the upper drum assembly
with your hand to make sure that it turns normally. Then
install the brush and the spring.
(7) Install the rotor assembly and stator assembly according
to Fig 2-2-23a and 2-2-24a.
(8) When installation is complete, clean the upper drum as-
sembly and lower drum assembly and carry out the following adjustments.
• PB switching point adjustment
• Slow tracking adjustment
• Compatibility adjustment (Be sure to check for compat-
ibility for the EP (or LP) mode.)
Upper drum
assembly
Collar
assembly
Fig. 2-2-25b
Fig. 2-2-25c
Press
Fig. 2-2-25d
Collar
assembly
Tighten
2-15
2.3 COMPATIBILITY ADJUSTMENT
Notes:
• Although compatibility adjustment is very important,
it is not necessary to perform this as part of the normal servicing work. It will be required when you have
replaced the audio control head, drum assembly or any
part of the tape transport system.
• To avoid any damage to the alignment tape while performing the compatibility adjustment, get a separate
cassette tape (for recording and play back) ready to
be used for checking the initial tape running behavior.
• Unless otherwise specified, all measuring points and
adjustment parts are located on the Main board.
• When using the Jig RCU, set its custom code to match
the custom code of the VCR.
Jig RCU
[Data transmitting method]
Depress the “” ( 3 ) button
after the data code is set.
(6) Make sure that the V.PB FM waveform varies in parallel
and linearly with the tracking operation again. When required, perform fine-adjustment of the guide roller of the
pole base assembly (supply or take-up side).
(7) Unload the cassette tape once, play back the alignment
tape (A1) again and confirm the V.PB FM waveform.
(8) After adjustment, confirm that the tape wrinkling does not
occur at the roller upper or lower limits. (See Fig. 2-31d.)
[Perform adjustment step (9) only for the models
equipped with SP mode and EP (or LP) mode.]
(9) Repeat steps (1) to (8) by using the alignment tape (A2).
CUSTOM CODE
43: A CODE
53: B CODE
DATA CODE
INITIAL MODE
Fig. 2-3a Jig RCU [PTU94023B]
2.3.1 Checking/Adjustment of FM Waveform Linearity
(1) Play back the alignment tape (A1).
(2) Apply the external trigger signal to D.FF (E), to observe
the V.PB FM waveform at the measuring point (D).
(3) Press the channel buttons (+, –) simultaneously to enter
the manual tracking mode. This also brings tracking to
the center (centre).
(4) Make sure that there is no significant level drop of the
V.PB FM waveform caused by the tracking operation, with
its generally parallel and linear variation ensured. Perform the following adjustments when required. (See Fig.
2-3-1a.)
(5) Reduce the V.PB FM waveform while pressing the chan-
nel buttons (+, –) during playback. If a drop in level is
found on the left side, turn the guide roller of the pole
base assembly (supply side) with the roller driver to make
the V.PB FM waveform linear.
If a drop in level is on the right side, likewise turn the guide
roller of the pole base assembly (take-up side) with the
roller driver to make it linear. (See Fig. 2-3-1c.)
Max level
Proper waveform variation
Improper waveform variation
Fig. 2-3-1a
Roller driver
Fig. 2-3-1b
Min level
Guide roller (supply side)
2-16
A
(2)
(3)
(1)
AUDIO OUT
Head base
Audio control head
CTL. P
Level drop at the guide roller (supply side)
C
Level drop at the guide roller (take-up side)
• Proper waveform variation: Always flat
B
the manual tracking mode. This also brings tracking to
the center (centre).
(4) Adjust the AUDIO OUT waveform and Control pulse
waveform by turning the screws (1), (2) and (3) little by
little until both waveforms reach maximum. The screw (1)
and (3) are for adjustment of tilt and the screw (2) for azimuth.
D
(3) Press the channel buttons (+, –) simultaneously to enter
• Improper waveform variation:
HigherLower
Fig. 2-3-1c
Fig. 2-3-2a
2.3.3 Checking/Adjustment of the Audio Control Head
Improper
(a) Guide roller
(b) Guide pole
Fig. 2-3-1d
Proper
Phase (X-Value)
Signal(A1)•
Mode(B)• PB
Equipment(C)• Oscilloscope
Measuring point (D)• TP106 (PB. FM)
External trigger(E)• TP111 (D.FF)
Adjustment part (F)•
Specified value(G)• Maximum V.PB FM waveform
Adjustment tool(H)• A/C head positioning tool [PTU94010]
Alignment tape(SP, stairstep, PAL) [MHPE]
A/C head base [Mechanism assembly]
(1) Play back the alignment tape (A1).
2.3.2 Checking/Adjustment of the Height and Tilt of the
Audio Control Head
Note:
• Set a temporary level of the height of the A/C head in
advance to make the adjustment easier after the A/C
head has been replaced. (See Fig.2-2-6c.)
Signal(A)•
Mode(B)• PB
Equipment(C)• Oscilloscope
Measuring point (D1)• AUDIO OUT terminal
(D2)• TP4001 (CTL. P)
External trigger(E)• TP111 (D.FF)
Adjustment part (F)• A/C head [Mechanism assembly]
Specified value(G)• Maximum waveform
(1) Play back the alignment tape (A).
Alignment tape(SP, stairstep, PAL) [MHPE]
(2) Apply the external trigger signal to D.FF (E), to observe
the AUDIO OUT waveform and Control pulse waveform
at the measuring points (D1) and (D2) in the ALT mode.
(2) Apply the external trigger signal to D.FF (E), to observe
the V.PB FM waveform at the measuring point (D).
(3) Press the channel buttons (+, –) simultaneously to enter
the manual tracking mode. This also brings tracking to
the center (centre).
(4) Loosen the screws (4) and (5), then set the A/C head
positioning tool to the innermost projected part of the A/
C head. (See Fig. 2-3-3a.)
(5) Turn the A/C head positioning tool fully toward the cap-
stan. Then turn it back gradually toward the drum and
stop on the second peak point position of the V.PB FM
waveform output level. Then tighten the screws (4) and
(5).
(6) Perform the tracking operation and make sure that the
V.PB FM waveform is at its maximum.
If it is not at maximum, loosen the screws (4) and (5),
and turn the A/C head positioning tool to bring the A/C
head to a position, around where the waveform reaches
its maximum for the first time. Then tighten the screws
(4) and (5).
2-17
[Perform adjustment steps (7) to (10) only for 2 Head
models equipped with LP mode.]
(7) Then play back the alignment tape (A2).
(8) Press the channel buttons (+, –) simultaneously to enter
the manual tracking mode. This also brings tracking to
the center (centre).
(9) Perform the tracking operation and make sure that the
V.PB FM waveform is at its maximum.
(10)
If it is not at maximum, loosen the screws (4) and (5),
and turn the A/C head positioning tool to bring the A/C
head to a position, around where the waveform reaches
its maximum for the first time. Then tighten the screws
(4) and (5).
Note:
• After adjusting, always perform the confirmation and
re-adjustment of the item 2.3.4.
Toward the drum
A/C head positioning tool
To the drum
Audio control head
Toward the capstan
Head base
Screw
Screw
To the capstan
(4)
(5)
Fig. 2-3-3a
Alignment tape
[SP, stairstep]
played with the
SP head
Alignment tape
[EP(LP), stairstep]
played with the
EP(LP) head
(1) Play back the alignment tape (A).
(2) Apply the external trigger signal to D.FF (E), to observe
the V.PB FM waveform at the measuring point (D).
(3) Confirm that the automatic tracking operation is com-
pleted.
(4) Set the VCR to the Auto adjust mode by transmitting the
code (F) twice from the Jig RCU. When the VCR enters
the stop mode, the adjustment is completed.
(5) If the VCR enters the eject mode, perform adjustment for
the audio control head phase (X-value) again.
2.3.5 Checking/Adjustment of the Tension Pole Position
(1) Play back the back tension cassette gauge (A).
(2) Check that the indicated value on the left side gauge is
within the specified value (G).
(3) If the indicated value is not within the specified value (G),
perform the adjustment in a following procedure.
1) Set the VCR to the mechanism service mode. (See
1.5 MECHANISM SERVICE MODE.)
2) Set the VCR to the play back mode and adjust by turning adjustment pin to align the tension arm assembly
edge with the main deck hole (A) on the right edge
marker. (See Fig. 2-3-5a)
Tension arm
assembly
Hole (A)
Edge
Waveform output
X-value adjustment point
Drum sideControl head positionCapstan side
Maximum
Fig. 2-3-3b
2.3.4 Checking/Adjustment of the Standard Tracking
Preset
Signal(A)•
Mode(B)• PB ¥ Auto adjust
Equipment(C)• Oscilloscope
Measuring point (D)• TP106 (PB. FM)
External trigger(E)• TP111 (D.FF)
Adjustment part (F)• Jig RCU: Code “50”
Specified value(G)• STOP mode
Adjustment tool(H)• Jig RCU [PTU94023B]
Alignment tape(LP, stairstep, PAL) [MHPE-L]
(Maximum V.PB FM waveform)
Marker
0.5 mm
Tension arm assembly
Tension brake assembly
Adjust pin
Fig. 2-3-5a
2-18
Mechanism Timing Chart
Mechanism mode
Control plate mark
Rotary encoder
Control cam angle
EJECT
END
EUCI
HIGH
C CH
LOW
HIGH
B CH
LOW
HIGH
A CH
LOW
0
CASS-
UP
69136370412.
CASS-INS
FF/REW
FR
230
STOP
ST
264.
REV
R
7
318.
7
SLOW/STILLPPLAY
SL
42
Rotary encoder
angle
Pole base
Pinch roller
Guide arm
Tension arm
Main brake S
Main brake T
Sub brake S
Sub brake T
Capstan brake
Direct gear
Change lever 2
Idler position
Take-up lever
Rec safety switch
Operation mode
HALF PRESS
CONTACT
ON PLAY
ON REV
CONTACT
(C-INS)
HALF REV
HALF FF/REW
CONTACT
CONTACT
IN FF/REW
OUT PLAY
SUPPLY
CENTER
TAKE-UP
READY
RESET
OFF
OFF
OFF
OFF
OFF
OFF
OFF
OFF
OFF
OFF
OFF
0
2042.652.
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
6
6
114.
150.4167.8178.
8
Timer REC
(drum at stop)
POWER OFF
(cassette loaded)
207.2218.2240.2251.
standby
STOP
BackspaceSlow FOR
Search REW
Slow REW
2
293.2304.2320.4335
REC pause
REC
Search FF
STOP
(
drum
in motion)
2-19
2-20
MECHANISM ADJUSTMENT (DV)
2.9 PREPARATION
2.9.1 Precautions
(1) Observe the specified screw tightening torque when at-
taching parts. The torque should be 0.04 Nm (0.4 kgfcm)
unless otherwise specified.
(2) Always disconnect the power supply unit before proceed-
ing to solder or attach parts.
(3) When plugging or unplugging a wire, be careful not to
damage the connector.
(4) When replacing a part, be careful not to damage other
parts or to mistakenly attach parts.
2.9.2 Tools Required for Adjustments
TORQUE DRIVER
12
YTU94088
Tool for replacing tip IC
4
PTS40844-2
BIT
YTU94088-003
Table 2-9-1 Tools Required for Adjustments
2.9.3 Disassembly and Assembly Procedures
The following table shows the steps for assembling or disassembling the mechanism parts. Read the following descriptions carefully before actual assembly/disassembly operations.
: Order of disassembly steps. Reverse this order when
(1)
assembling.
: Name of the disassembled/assembled part.
(2)
: Surface where the disassembled/assembled part is
(3)
mounted. T = Top. B: Bottom.
: Number of disassembly drawing.
(4)
Tool for installing slit washer
3
YTU94121A
: Parts to be removed in disassembly/assembly, such as
(5)
screws, washers and springs, and the points.
SymbolName & Point
SScrew
WWasher
PSpring
*
Connector, lock(L), soldering(SD),
shield, etc.
[Example] • (W1) = Remove the washer W1.
• (P1) = Remove the spring P1.
: Notes for disassembly/assembly.
(6)
: For the phase alignment in disassembly/assembly and
(7)
the parts which require phase adjustments after assembly, see “2.16 MECHANISM PHASE CHECK/ADJUSTMENT”.
2.9.4 Screws and Washers Used in Disassembly/Assembly of the Mechanism Assembly
Table 2-9-1 shows the symbols, designs, part numbers and
colors of the screws and washers used in the mechanism
assembly.
When disassembling or assembling the mechanism assembly, be sure to attach screws and washers correctly by referring to the following table.
(S1)
(S2)
(S3)
Symbol
(W1)
(W2)
(W3)
Part numberSymbol
QYTDSP2004Z
YQ43893
YQ43893-7
Part number
YQ44246
YQ44246-3
YQ43933-2
Color
GOLD
SILVER
BLACK
Color
RED
BLACK
BLACK
Table 2-9-2
Step
/LocPart Name
No.
1
A Cassette housing assembly/ B Mechanism assemblyT1
Fig.
No.
2(S1),(L1) – (L5)
PointNoteDiscription
1
2 1 Drum assemblyT23(S2)2,3
3 2 Motor bracket assemblyT24(S2)2,4
4 3 Middle catcher assemblyT33(S2)—
§§§§§§§
(1)(2)(3)(4)(5)(6)(7)
2-21
2.10 DISASSEMBLY/ASSEMBLY OF THE MECHANISM
ASSEMBLY
2.10.1 Introduction
The disassembly and assembly of the mechanism assembly should usually be performed in the ASSEMBLY mode.
(Table 2-10-1)
Note that the mechanism is in the cassette in (C-IN) mode
when the mechanism assembly is taken out of the set and
that the C-IN mode should be switched to the ASSEMBLY
mode in this case.
To set the ASSEMBLY mode, apply 3 V DC to the electrodes
on the upper part of the loading motor as shown in Fig. 210-7.
MODE
PARTS
1
ROTARY
ENCORDER
R. ENC-20
MAIN CAM GEAR0
2
3
36°
C-IN
ASSEMBLY
17°
S. FF
30.33°
36.33°
0
15
33.33
40
Table 2-10-1
2.10.2 Mechanism Modes
The mechanism has 6 modes as shown in Table 2-11-1. The
current mode can be confirmed by the positioning of the “
”
marking on the sub-cam gear and the “ ” marking on the
mechanism.
See the following figures (Figs. 2-10-1 to -6) for details.
Note:
•
This mechanism assembly has another ASSEMBLY
mode. However, this mode cannot be identified from the
markings because it corresponds to an intermediate position between the C-IN ( C ) mode and S-FF ( H ) mode.
This mode can be confirmed by the rotary encoder
phase. See Fig. 2-10-7.
LOADING END
87°
166.66
PLAYREVSTOPFF/REW
223.66°
229.66°
226.66
185
140
190.33°
196.33°
169.66°
193.33
160
270.33°
273.33
220
276.33°
303.66°
306.66
245
1. Checking the mechanism mode
CHP
H
Fig. 2-10-1Fig. 2-10-2Fig. 2-10-3
RSF
Fig. 2-10-4Fig. 2-10-5Fig. 2-10-6
2-22
2. Setting/checking the ASSEMBLY mode
Wire (Brown)
Note:
• In this ASSEMBLY mode, only the 2
gear teeth of the rotary encoder are
marked (red coloring).
<Note 1> : If the wires for the cassette housing motor are
connected to the circuit board, remove them before disassembly.
(L3)
A
(L4)
(L1)
Fig. 2-13-1
(L5)
<Note1>
2
(S1)
(L2)
B
2. 1 Drum assembly / 2 Motor bracket assembly
3
4
(S2)
(S2)
8
(S2)
<Note2>
9
(S2)
6
(S2)
7
(S2)
<Note4>
2
<Note3>
<Note2>
1
5
(S2)
<Note 2> : If wires are connected to the circuit board, re-
move them before disassembly.
<Note 3> : Be careful not to damage the drum assembly
when removing it.
<Note 4> : The bracket (DV) may come in the way of re-
moval of screw (7). Be sure to remove the
bracket before proceeding to the screw removal.
Fig. 2-13-2
2-27
3. 3
Middle Catcher Assembly/
4
<Note5>
(L6)
(L6)
4 Reel Cover Assembly
13
(S2)
Fig. 2-13-3
12
(S2)
10
(S2)
<Note 5> : Once the reel cover assembly has been re-
moved, the parts located below it tend to slip out
easily: Be careful.
11
(S2)
3
4.
5 Pinch Roller Arm Assembly/ 6 Sub Brake Assembly/
7 Band Arm Plate Sub Assembly/ 8 Tension Arm Sub
Assembly
<Note 8>:
How to install the spring
Step 1
Hook a
8
Step 2
Hook b
(W1)
(P2)
14
(S3)
(P3)
(W2)
7
<Note7>
NOTE8
5
Step 3
<Note6>
(L9)
<Note 6> : When attaching this part, fit it in the boss (L7)
on the charge arm assembly.
<Note 7> : When attaching or removing this part, take care
of the handling of the band section.
<Note 8> : After fitting the spring on the shaft, engage it with
hook a first then with hook b .
After attaching it, set it to the positioning shown
in “Step 3” and confirm that band arm plate sub
assembly 7 can be rotated in the direction of
the arrow as shown below.
(W1)
2-28
6
(P1)
(L8)
Fig. 2-13-4
(L7)
Fig. 2-13-4A
5.
9 EXIT Guide Arm Assembly/ 10 Swing Arm Assembly
10
9
(W1)
Fig. 2-13-5
6.
11 Sub Deck Assembly/ 12 Main Brake (Sup) Assembly/
13 Main Brake (Take up) Assembly
15
(S2)
(P4)
(P5)
13
12
(
L10
16
(S2)
)
(
L11
<Note9>
18
(S2)
)
17
(S2)
11
<Note 9> : When attaching the sub deck assembly, make
sure to adjust the phase of the control plate.
Fig. 2-13-6
2-29
7.
14 Reel disk assembly (Sup) / 15 Reel disk assembly
(Take up) / 16 Prism / 17 Control plate
<Note 10> : When attaching, set the alignment markings of
the two gears so that the markings face oppo-
(
)
L13
24
<Note10>
(S2)
19
25
(S2)
)
21
(S2)
20
(S2)
22
(S2)
18
23
(S2)
site to each other.
19
18
Fig. 2-13-8A
2-30
Fig. 2-13-8
9.21 Ent. guide base assembly /
23
Timing belt / 24 Center gear assembly
26
(S2)
22
21
<Note11>
22
Worm wheel 2 /
23
24
<Note 11> : How to attach the worm wheel 2 22 .
22
34
Align the phase of the rotary encoder assembly 34 ,
then attach it by aligning the phase hole of the mechanism assembly.
Fig. 2-13-9A
Phase alignment
Mark (Red)
Fig. 2-13-9
10.
25
Reel drive pulley assembly / 26
27
Clutch lock gear(2) / 28 Clutch lock gear (1)
(W1)
26
27
(W3)
(P6)
28
Push plate
(W1)
25
Fig. 2-13-10
2-31
29 Tension control arm assembly/ 30 Brake control
11.
arm assembly /
31
Charge arm assembly
(
)
L16
(W1)
30
(
<Note12>
(
)
L15
L17
)
<Note13>
29
31
<Note 12> : How to attach the tension control arm assem-
bly 29 / Brake control arm assembly 30 .
34
30
Boss
29
(Phase alignment)
35
Align the phase of the main cam 35 , then attach it by
fitting the bosses into the cam slot.
Fig. 2-13-11A
<Note 13> : How to attach the charge arm assembly 31 .
Fig. 2-13-11
12. 32 Connect gear 2 / 33 Connect gear 2
27
(S2)
32
28
(S2)
33
31
39
38
Phase alignment
Boss
(Phase alignment)
Align the phase of the sub cam 38 , then attach it by
fitting the boss into the cam slot.
Fig. 2-13-11B
2-32
Fig. 2-13-12
13.
34 Rotary encoder assembly / 35 Main cam /
36
Arm gear 1 assembly / 37 Centering arm assembly
<Note 14> :
How to attach the rotary encoder assembly 34 .
COLLAR
<Note15>
36
<Note14>
34
(
)
L18
<Note16>
29
(S2)
37
<Note15>
Fig. 2-13-13
30
(S2)
(W1)
35
<Note15>
34
Mark (colored : red)
35
Phase alignment
Align the phase of the main cam 35 , then attach it by
placing the (red) coloured markings (on 2 gear teeth)
within the encircled area.
Fig. 2-13-13A
<Note 15> : How to attach the main cam 35 .
Boss
Phase alignment
35
Boss
36
Phase alignment
37
Phase alignment
Align the phases of the arm gear 1 assembly 36 and
centering arm assembly 37 , then attach the arm gear 1
assembly 36 /centering arm assembly 37 by fitting the
bosses into the lower cam slot, and fit the slit washer.
Fig. 2-13-13B
<Note 16> :
How to remove the centering arm assembly 37
The center arm assembly is located behind the
mechanism assembly when the phase is
aligned correctly. The center arm assembly can
be removed by displacing it in the direction of
the arrow.
L18
37
Phase alignment
Fig. 2-13-13C
2-33
14.38
Sub cam / 39
Arm gear 2 assembly /
40 Clutch lock lever assembly
<Note 17> : How to attach the sub cam 38 .
15.41
<Note17>
40
<Note18>
(
)
L19
Fig. 2-13-14
Capstan motor / 42
31
(S2)
<Note17>
38
Drum base deck
<Note17>
39
Boss
39
38
Phase alignment
Phase alignment
40
Phase alignment
Align the phases of the arm gear 2 assembly 39 and
clutch lock lever assembly 40 , then attach them by
fitting the boss into the lower cam slot and tighten the
screws.
Fig. 2-13-14A
<Note 18> :
How to remove the clutch lock lever assembly 40
L19 is located behind the mechanism assembly when the phase is aligned correctly. The
clutch lock lever assembly can be removed by
displacing it in the direction of the arrow.
Phase alignment
40
42
32
(S2)
33
(S2)
ADJUST NUT
Fig. 2-13-15
34
(S2)
L19
Fig. 2-13-14B
41
(P7)
2-34
2.14LIST OF PROCEDURES FOR DISASSEMBLY
24
23
17
29
(S2)
34
(W2)
7
(P3)
12
29
30
(S2)
25
(S2)
20
COLOR
14(S3)
26
(S2)
21
8
(W1)
27
28
13
16
(S2)
35
37
26
(W3)
(P6)
(W1)
32
14
(S2)
30
22
15
11
33
(S2)
(W1)
15
27
(S2)
32
(S2)
ADJ.
NUT
(P7)
28
(S2)
33
19
(S2)
16
34
(S2)
(W1)
6
17
(S2)
(S2)
42
18
18
(W1)
25
21
(S2)
31(S2)
19
41
38
10
20
(S2)
(S2)
(S2)
12
(S2)
(S2)
31
22
23
4
24
9(S2)
8(S2)
5
10
(S2)
4
(S2)
6(S2)
11
(S2)
3
(W1)
13
(S2)
7(S2)
2
3
(S2)
5
(S2)
1
(W1)
9
36
40
Note :
• For the greasing and oiling locations,
see “SECTION 5 PARTS LIST” (Page 5-6).
1. Set the mechanism mode to the PLAY mode. (See pages
2-20 and 21.)
2. Loosen a screw A .
3. Check the location of the tip (section B ) of the tension
arm assembly to make sure that it is within area C .
If it is located outside, turn part D to bring it within the
specified area.
4. Tighten the screw A .
Note :
Tightening torque for the screw A : 0.06 Nm (0.6
kgfcm)
Screw A
2-39
2.18
COMPATIBILITY AND ERROR RATE ADJUSTMENTS
2.18.1 Preparation
Before disassembly and adjustment, back up the data stored
in the EEPROM (IC1007 on the DV MAIN board) using the
Service Support System Software (SSS software).
Table 2-18-1 shows the important service points for the compatibility and error rate adjustments.
Adjustment Item
Service Point
Drum replacementRequiredRequiredRequired
Transport partRequiredNotCheck
replacement Note 1
Transport partRequiredNotCheck
(drum) repair Note 1
IC2001
(PB. EQ on DVNotNotRequired
MAIN board)
replacement
DV MAIN board
replacementNotRequiredRequired
Note 2
Linearity
Adjustment
Note 1
PB Switching
Point Adjustment
Adjustmenmt
Error Rate
Table 2-18-1
Note 1 :
• The linearity adjustment is required only after servicing or
replacing the drum or the take up/supply guide rail.
Note 2 :
•
After replacing the DV MAIN board, write the original data in
the EEPROM of the new board. If write communication is not
possible, mount the original EEPROM on the new board.
When adjustments of more than one item are required, use
the following order for the adjustments.
2.18.3 Linearity Adjustment
∫
2.18.4 PB Switching Point Adjustment
∫
2.18.5 Error Rate Adjustment
2.18.2 Adjustment
The actual adjustment requires the following preparation.
1. Tools required for adjustment
Alignment tape
US : MC-1
PAL : MC-2
Guide driver
YTU94085
Jig connector cable
PTU94018B
2. Procedure
1. Take out the 7 screws (1 to 7), then remove the top cover.
(See Fig. COM1 on page 1-3 of section 1.5.)
2. Connect the jig connector cable to CN1101 on the DV
MAIN board.
Jig Connector Cable
PTU94018B
CN1101
DV MAIN PWB
<Note> : Switch setting of the
Jig connector cable
Switch OFF
(UP)
Fig. 2-18-2
3. Setup for computer adjustment
– Setup by extending the jig connector –
When performing the adjustment by the SSS software, set the VCR
to external communication mode by transmitting the code “6C” from
the Jig RCU.
Jig RCU
[PTU94023B]
[Data transmitting method]
Depress the “” ( 3 ) button
after the data code is set.
Switch
INITIAL MODE
DATA CODE
CUSTOM CODE
43: A CODE
53: B CODE
<JLIP>
PC Cable
QAM0099-002
<Note> : Switch setting of the
Service Support Software
RS-232C Port
Jig connector cable
Switch OFF
JVC
MENU
Personal Computer
(UP)
2-40
SSS software
PTU94016-3
PC cable
US : QAM0099-002
PAL : QAM0099-005
Fig. 2-18-1
Jig RCU
PTU94023B
CN1101
DV MAIN PWB
Fig. 2-18-3
2.18.3 Linearity adjustment
The “PB Switching Point” in the Adjustment Utility of
the SSS software is adjusted automatically.
Load the alignment tape.
The following flowchart shows the linearity check/adjustment
procedure.
Connect an oscilloscope (CH: + Slope) and, while triggering
it with the HID signal, observe the ENV OUT waveform.
Play the alignment tape, then set “ATF” (Auto Tracking
Find) in “Deck Controller” of the SSS Software to ON.
(Note 3)
2.18.4 PB switching point adjustment
The following flowchart shows the PB switching point adjustment procedure.
Ensure that the ENV OUT waveform is linear and parallel,
without a noticeable drop or variation in the overall level. If
the waveform linearity is poor or there is a noticeable drop
in level, adjust the guide roller by turning it with the roller
driver.
Set “ATF” (Auto Tracking Find) to OFF using “Deck
Controller” of the SSS Software (Note 4). Observe the ENV
OUT waveform to confirm that the overall waveform
balance and linearity levels vary in accordance with the
tracking variation as shown in Fig. 2-18-3.
Repeat above steps
as required.
No
The linearity adjustment is complete if the PB ENV
waveform is ideally stable and varies ideally according to
the tracking variation. To close, play a prerecorded tape and
check the audio and video.
Is the PB ENV waveform ideally
stable and does it vary ideally
according to the tracking variation?
Yes
2.18.5 Error rate adjustment
The following flowchart shows the error rate adjustment procedure.
Record a color bar signal for about 5 minute s. (Note 6)
While playing the recorded signal, adjust “
Frequency (ME SP)
“Deck Section” of the Adjustment Utility.
To adjust VCO Center Frequency (ME SP) : Set Viterbi OFF.
To adjust VCO Center Frequency (ME LP) : Set Viterbi ON.
No
” or “
VCO Center Frequency (ME LP)
Is the obtained error rate minimum
(almost the typical value)?
VCO Center
” in
Yes
The error rate adjustment is complete when the minimum
error rate which is no higher than the typical value is
obtained. (Note 5)
HID waveform
PB ENV
waveform
Fig. 2-18-4 PB ENV Waveform
Note 3 :
• The VHS section has an A/C head, and the first tracking
position can be locked using the CTL pulse and drum FF
when AT is off. Therefore, the linearity of the VHS section
can usually be adjusted with AT off. However, this adjustment method is not available with the DV section, which
does not have the A/C head. If ATF is turned off, the DV
section performs tracking only of the speed system. Therefore, as time passes, the servo will be lost and the linearity
adjustment will become difficult.
Note 4 :
• Since the speed servo function is active when ATF is off,
there will be no problem even if the DVC ATF function is
off, provided that it is for a few minutes.
CH1
CH2
Adjust variation
in the parallelism
Note 5 :
• The “typical value” refers to the following:
CH1 or CH2: < 498.; with Viterbi OFF. Inter-channel difference: < 10 times between CH1 and CH2.
Note 6 :
• It is desirable to use a brand-new tape or an unused section of tape. This is to assure the adjustment reliability because using a damaged tape increases the error rate.
2.18.6 Error rate measuring method
It is not necessary to use the error rate jig (YTU93083) or a
frequency counter. The Service Support System Software
displays the error rates of video CH1, CH2 and totals. When
measuring the error rate of a channel, be sure to total the
values of the video and the audio errors.
2-41
2.19 TAPE EJECTION
If a loaded cassette tape cannot be ejected due to a failure
in the electrical circuitry, take the cassette tape out using the
following procedure.
However, this method consists of a forced driving of the loading motor. Therefore, the following description assumes that
there is no trouble in the mechanism operations.
1. Unplug the power plug from the power outlet, then remove the top cover.
2. Apply 3 V DC to the electrodes (Red wire: + pole. Brown
wire: - pole) on the upper part of the loading motor to perform the unloading operation so that the pole base assemblies are returned on the inner side of the tape. At
this time, the exit guide arm assembly should return toward the drum assembly and the mechanism should enter the C-IN mode.
As the tape is left without winding, be careful not to damage the tape or leave grease on it.
–
DC 3 V
+
Motor Bracket Assembly (Loading Motor)
Wire (Brown)
3. If the tape is slack, wind it up by turning the shaft on the
topside of the capstan motor in the direction of the arrow
using a pointed tool (chip IC replacement jig).
This operation may be difficult because the shaft is located below the housing motor of the cassette housing
assembly. Be careful not to damage parts during it.
4. After confirming that the tape is fully wound up, take out
the cassette tape by turning the gear of the cassette housing assembly in the direction of the arrow.
Note :
• After ejecting the tape, check that grease or similar for-
eign material is not attached to the wound tape. Also
perform similar checking for the mechanism assembly,
particularly the tape transport system.
Exit Guide Arm Assembly
Cassette Housing Motor
Wire (Red)
Pole Base Assembly (Supply)
Rotary Encoder Assembly
[3] Tape winding[4] Tape ejection
Capstan motorCassette housing assembly, side view
AB
Chip IC replacement jig
Shaft
A
Pole Base Assembly (Take-Up)
B
Cassette Housing Assembly
Gear
2-42
Capstan motor
Ejection direction
Fig. 2-19-1
SECTION 3
ELECTRICAL ADJUSTMENT (VHS)
3.1 PRECAUTION
The following adjustment procedures are not only necessary
after replacement of consumable mechanical parts or board
assemblies, but are also provided as references to be referred to when servicing the electrical circuitry.
In case of trouble with the electrical circuitry, always begin a
service by identifying the defective points by using the measuring instruments as described in the following electrical adjustment procedures. After this, proceed to the repair, replacement and/or adjustment. If the required measuring instruments
are not available in the field, do not change the adjustment
parts (variable resistor, etc.) carelessly.
• Signal generator: stairstep, color (colour) bar [PAL]
• Recording tape
• Digit-key remote controller(provided)
3.1.2 Required adjustment tools
Jig RCU
PTU94023B
Alignment tape
(SP, stairstep, PAL)
MHPE
Alignment tape
(LP, stairstep, PAL)
MHPE-L
Jig RCU
[Data transmitting method]
Depress the “ ” ( 3 ) button
after the data code is set.
CUSTOM CODE
43: A CODE
53: B CODE
DATA CODE
INITIAL MODE
Fig. 3-1-4a Jig RCU [PTU94023B]
• Set the switches as shown below unless otherwise
specified on the relevant adjustment chart. The
switches that are not listed below can be set as desired.
If the VCR is not equipped with the functions detailed
below, setup is not required.
AUTO PICTURE/VIDEO CALIBRATION/
B.E.S.T./D.S.P.C.
PICTURE CONTROL/SMART PICTURE
VIDEO STABILIZEROFF
TBCON
Digital 3RON
VIDEO NAVIGATION/TAPE MANAGER
OFF
NORMAL/NATURAL
OFF
• Unless otherwise specified, all measuring points and
adjustment parts are located on the Main board.
• In the Signal column of the adjustment chart, “Ext. Sinput” means the Y/C separated video signal and “Ext.
input” means the composite video signal input.
Burst
LPF
PTU93006
0.3 V
Alignment tape
(S-VHS, SP/LP, color (colour) bar)
s
Colour bar pattern [PAL]
(75%)
White
UBlack
V
Yellow
Cyan
White
100%
MH-2H
Green
Magenta
Red
Blue
Alignment tape
(SP stairstep, NTSC)
MHP
3.1.3
Color (colour) bar signal,Color (colour) bar pattern
s
Colour bar signal [PAL]
White(100%)
White(75%)
0.7 V
1V
0.3 V
Horizontal sync
Yellow
Cyan
Green
Magenta
Red
VU
V(R-Y)
U(B-Y)
Blue
3.1.4 Switch settings and standard precautions
The SW settings of the VCR and the standard precautions
for the electrical adjustments are as follows.
• When using the Jig RCU, set its custom code to match
the custom code of the VCR.
3.1.5 EVR Adjustment
Some of the electrical adjustments require the adjustment
performed by the EVR system. The Main board assembly
have EEPROMs for storing the EVR adjustment data and
user setups.
Notes:
• In the EVR adjustment mode, the value is varied with
the channel buttons (+, –). The adjusted data is stored
when the setting mode changes (from PB to STOP,
when the tape speed is changed, etc.). Take care to
identify the current mode of each adjustment item
when making an adjustment.
• When changing the address setting in the EVR adjustment mode, use the Jig RCU or the remote controller
having numeric keypad with which a numeric code can
be directly input.
The remote control code of the Jig RCU corresponds
to each of the digit keys on the remote controller as
follows.
Digit-key 0123456789
Code20 21 22 23 24 2526 27 28 29
• As the counter indication and remaining tape indication are not displayed FDP during the EVR adjustment
mode, check them on the TV monitor screen.
• When performing the EVR adjustment, confirm that the
FDP indication is changed to the EVR mode, as shown
below.
(1) Play back the signal (A1) of the alignment tape (A2).
(2) Apply the external trigger signal to D.FF (E) to observe
the VIDEO OUT waveform and V.PB FM waveform at the
measuring points (D1) and (D2).
(3) Press the channel buttons (+, –) simultaneously to enter
the manual tracking mode. This also brings tracking to
the center (centre).
(4) Adjust tracking by pressing the channel buttons (+, –) so
that the V.PB FM waveform becomes maximum.
(5) Transmit the code (F) from the Jig RCU to adjust so that
the trigger point of the VIDEO OUT waveform is changed
from the trailing edge of the V.sync signal becomes the
specified value (G).
(6) Set the VCR to the stop mode or eject mode.
(7) Play back the signal (A1) of the alignment tape (A3).
(8) Repeat steps (2) to (6).
Trigger point
Switching point
V.sync
(1) Record the signal (A2) in the mode (B1), and play back
the recorded signal.
(2) Press the channel buttons (+, –) simultaneously to enter
the manual tracking mode. This also brings tracking to
the center (centre).
(3) Set the VCR to the FWD slow (+1/6×) mode.
(4) Transmit the code (F) from the Jig RCU to adjust so that
the noise bar becomes the specified value (G) on the TV
monitor in the slow mode.
(5) Set the VCR to the Stop mode.
(6) Confirm that the noise bar is (G) on the TV monitor in
the slow mode.
(7) Repeat steps (3) to (6) in the REV slow (–1/6×) mode.
(8) Repeat steps (1) to (7) in the mode (B2).
Note:
• For FWD slow (+1/6×) playback, transmit the code “08”
from the Jig RCU to enter the slow playback mode, and
transmit the code “D0” for REV slow (–1/6×) mode.
3.3 VIDEO CIRCUIT
3.3.1 D/A level
Signal(A1)• Ext. S-input / Ext. input
Mode(B)• S-VHS
(A2)• Color (colour) bar signal [PAL]
(A3)• S-VHS tape
• EE
Equipment(C)• Oscilloscope
Measuring point (D)•
Adjustment part (F)• VR1401 (D/A LEVEL ADJ)
(1) Insert the cassette tape (A3) to enter the mode (B).
(2) Observe the Y OUT waveform at the measuring point (D).
(3) Check the Y level value when the External S-input (Y/C
separated video signal).
(4) Switch the input signal to the External input (composite
video signal), and adjust the adjustment part (F) so that
the Y level becomes the same value observed in step
(3).
Note:
• The specified value (G) is just a reference value to be
obtained when the External S-Video (Y/C separated
video) signal is input. In actual adjustment, set it to
the value observed in step (3).
Y OUT terminal (75Ø terminated)
[3D DIGITAL/2M board]
Fig. 3-2-1a Switching point
3.2.2 Slow tracking preset
Signal(A1)• Ext. input
(A2)• Color (colour) bar signal [PAL]
Mode(B1)• S-VHS SP
(B2)• S-VHS LP
Measuring point (D)• TV-Monitor
Adjustment part (F)• Jig RCU: Code “71“ or “72”
Specified value(G)• Minimum noise
Adjustment tool(H)• Jig RCU [PTU94023B]
3-2
V. rate
Specified
value (G)
H. rate
Fig. 3-3-1a D/A level
1 kØ 39 µH180 µH
120 pF180 pF
PB. FM
629 [kHz]
PB COLOR
(PB COLOUR)
3.3.2 EE Y level
Signal(A1)• Ext. input
Mode(B)• EE
Equipment(C)• Oscilloscope
Measuring point (D)• Y OUT terminal (75Ø terminated)
Connect the adjustment tool (H3) to the measuring point (D1).
(2)
Apply the external trigger signal to D.FF (E) to observe the
PB color (colour) waveform at the measuring point (D2).
(3) Play back the signal (A3) in the mode (B1) of the align-
ment tape (A1).
(4) Press the channel buttons (+, –) simultaneously to enter
the manual tracking mode. This also brings tracking to
the center (centre).
(5) Adjust tracking by pressing the channel buttons (+, –) so
that the PB color (colour) waveform becomes maximum.
Make a note of the higher PB color (colour) level as “B”
at this time.
(6) Record the signal (A3) in the mode (B1), and play back
the recorded signal.
(7) Set the VCR to the EVR mode by transmitting the code
(F1) from the Jig RCU.
(8) Set the EVR address to (F2) by pressing the button of
the digit-key remote controller.
(H2)• Digit-key remote controller
(H3)• LPF [PTU93006] (See Fig. 3-3-4a.)
Fig. 3-3-4a LPF
3-3
(9) Adjust with the channel buttons (+, –) on the VCR (or on
the remote controller) so that the higher level channel becomes the specified value (G) of the note "B" level as
shown in Fig. 3-3-4b. (Adjust before recording, then confirm it by playing back.)
(10)
After adjustment, record the signal (A3) then playing it
back again. At this time, confirm that there is no inverting phenomenon or noise appearing on the playback
screen.
(11)
Release the EVR mode of the VCR by transmitting the
code (F1) from the Jig RCU again. (When the EVR mode
is released, the adjusted data is memorized.)
(12)
Repeat steps (3) to (11) in the mode (B2).
Note:
• After adjusting, always perform the confirmation and
re-adjustment of the item 3.4.1.
Specified
value (G)
V. rate
Fig. 3-3-4b REC color (colour) level
3.3.5 Video EQ (Frequency response)
Signal(A1)• Ext. S-input
Mode(B1)• S-VHS SP
Equipment(C)• Oscilloscope
Measuring point (D1)• Y OUT terminal (75Ø terminated)
(B2)• S-VHS LP
(B3)• Picture Control / Smart Picture
REC : Normal / Natural
PB: Edit / Distinct
“0” and “3” keys)
• LP: 3.2 ± 0.4 div. (–2 ± 1 dB)
Adjustment tool(H)• Jig RCU [PTU94023B]
• Digit-key remote controller
(1) Apply the external trigger signal to D.FF (E) to observe
the Y OUT waveform at the measuring point (D1).
(2) Record the signal (A2) in the mode (B1), and play back
the recorded signal.
(3) Press the channel buttons (+, –) simultaneously to enter
the manual tracking mode. This also brings tracking to
the center (centre).
(4) Set the VCR to the EVR mode by transmitting the code
(F1) from the Jig RCU.
(5) Set the EVR address to (F2) by pressing the button of
the digit-key remote controller.
(6) Set the slope of the oscilloscope to the channel having
higher (D2) marker level of the Y OUT waveform [signal
(A2)]. Then set the 100 kHz marker level to the “4” scale
on the oscilloscope. In this condition, adjust with the channel buttons (+, –) on the VCR (or on the remote controller) so that the (D2) marker level reaches the specified
value (G).
3-4
(7) Release the EVR mode of the VCR by transmitting the
code (F1) from the Jig RCU again. (When the EVR mode
is released, the adjusted data is memorized.)
(1) Insert the cassette tape (A3).
(2) Set the VCR to the Auto adjust mode by transmitting the
code (F) from the Jig RCU. When the VCR enters the
stop mode, the adjustment is completed. When the VCR
enters the eject mode, repeat steps (1) to (2) again.
3.3.7 DV EE Y level
Signal(A1)• Ext. input
Mode(B)• VHS
Equipment(C)• Oscilloscope
Measuring point (D)•
Adjustment part (F)• VR701 (DV AGC)
Specified value(G)• 1.02 ± 0.02 Vp-p
(A2)• Color (colour) bar signal [PAL]
• EE
TP701 (DV AGC)
(1) Observe the VIDEO OUT waveform at the measuring
point (D).
(2) Adjust the adjustment part (F) so that the Y level of the
VIDEO OUT waveform becomes the specified value (G).
Note:
•
After adjusting, always perform the confirmation and
re-adjustment of the Electrical adjustment (DV).
Specified
value (G)
H. rate
Fig. 3-3-7a DV EE Y level
3.4 AUDIO CIRCUIT
Notes:
• This adjustment should be done after the “REC color
(colour) level adjustment” for the video circuit has
been completed.
• GND (Ground) should be taken from the Tuner shield
case.
(1) Apply the external trigger signal to D.FF (E) to observe
the Audio PB FM waveform at the measuring point (D).
(2) Record the signal (A3) with no audio signal input in the
mode (B), and play back the recorded signal.
(3) Press the channel buttons (+, –) simultaneously to enter
the manual tracking mode. This also brings tracking to
the center (centre).
(4) If the A.PB FM level is not within the specified value (G1),
perform the adjustment in a following procedure.
(5) Set the VCR to the EVR mode by transmitting the code
(F1) from the Jig RCU.
(6) Set the EVR address to (F2) by pressing the button of
the digit-key remote controller.
(7) Adjust with the channel buttons (+, –) on the VCR (or on
the remote controller) so that the A.PB FM level of the
higher channel level becomes the specified value (G1).
(Adjust before recording, then confirm it by playing back.)
(8) If the specified value (G1) is not obtained, adjust with the
channel buttons (+, –) so that the waveform level of the
lower channel level becomes the specified value (G2).
(Adjust before recording, then confirm it by playing back.)
(9) Release the EVR mode of the VCR by transmitting the
code (F1) from the Jig RCU again. (When the EVR mode
is released, the adjusted data is memorized.)
3.5 SYSCON CIRCUIT [SR-VS20E]
Note:
•
When perform this adjustment, remove the Mechanism
assembly.
3.5.1 Timer clock
Signal(A)• No signal
Mode(B)• EE
Equipment(C)• Frequency counter
Measuring point (D1)• IC3001 pin 61
Short point(D2)• IC3001 pin 24
Adjustment part (F)• C3025 (TIMER CLOCK)
Specified value (G)• 1024.008 ± 0.001 Hz
(D3)• C3026 + and –
(976.5549 ± 0.0010 µsec)
(1) Connect the frequency counter to the measuring point
(D1).
(2) Connect the short wire between the short point (D2) and
Vcc (5V).
(3) Short the leads of capacitor (D3) once in order to reset
the microprocessor of the SYSCON.
(4) Disconnect the short wire between the short point (D2)
and Vcc then connect it again.
(5) Adjust the Adjustment part (F) so that the output fre-
quency becomes the specified value (G).
Specified
value (G2)
V. rate
Fig. 3-4-1a Audio REC FM
Specified
value (G1)
3-5
ELECTRICAL ADJUSTMENT (DV)
3.6 PREPARATION
3.6.1 Precautions
(1) The DV section of this model is based on a special ad-
justment method using a PC. However, ordinary adjustment is required only when the part listed below has been
replaced. In this case, the adjustment should be performed by a service center equipped with the required
facilities.
2
PROM (IC1007 on DV main board)
• E
In case of trouble with the electrical circuitry, First identify the faulty position with a measuring tool as described
below. Proceed to repair, replacement and/or adjustment
only after the troubleshooting.
(2) When observing a chip TP, use an IC clip or similar tool
to protect the chip against stress. When replacing a chip
part (IC, particularly), remove solder completely before
replacing. (This is to prevent separation of the pattern.)
(3) The connectors are fragile. Be careful when plugging or
When performing the adjustment by the Service Support Software,
set the VCR to external communication mode by transmitting the code
“6C” from the Jig RCU.
Jig RCU
[PTU94023B]
INITIAL MODE
DATA CODE
[Data transmitting method]
Depress the “” ( 3 ) button
after the data code is set.
Switch
DV MAIN PWB
CN1101
<JLIP>
CUSTOM CODE
43: A CODE
53: B CODE
PC Cable
QAM0099-002
<Note> : Switch setting of the
Service Support Software
RS-232C Port
Personal Computer
Jig connector cable
Switch OFF
(UP)
JVC
MENU
3.6.3 Tools required for adjustments
Alignment tape
US : MC-1
PAL : MC-2
PC cable
US : QAM0099-002
PAL : QAM0099-005
Jig connector cable
PTU94018B
Jig RCU
PTU94023B
Fig. 3-6-3a
SSS software
PTU94016-3
Fig. 3-6-4a Setup for Computer Adjustment
3-6
SECTION 4
24
C331
11/10
22201816
WF25
C329
0.1/50
C330
0.1/50
R344
47K
R343
18K
R345
10K
R346
15K
Measurement point
Waveform number
CHARTS AND DIAGRAMS
NOTES OF SCHEMATIC DIAGRAM
Safety precautions
The Components identified by the symbol are
critical for safety. For continued safety, replace safety
critical components only with manufacturer's recommended parts.
1. Units of components on the schematic diagram
Unless otherwise specified.
1) All resistance values are in ohm, 1/6 W, 1/8 W (refer to
parts list).
Chip resistors are 1/16 W.
K or k: k (1000 ), M: M (1000k )
2) All capacitance values are in µF, (P: PF).
3) All inductance values are in µH, (m: mH).
4) All diodes are 1SS133, MA165 or 1N4148M (refer to parts
list).
2. Indications of control voltage
AUX : Active at high
AUX or AUX(L) : Active at low
3. Interpreting Connector indications
1
2
Removable connector
3
1
2
Wire soldered directly on board
3
4) Indication on schematic diagram
Voltage Indications for REC and PB mode on the schematic diagram are as shown below.
REC mode
12 3
2.5
(5.0)
PB mode
1.8
PB and REC modes
(Voltage of PB and REC modes
are the same)
Note: If the voltages are not indicated on the schematic
diagram, refer to the voltage charts.
5. Waveform measurement
1) Video circuits
REC : Colour bar signal in SP mode, normal VHS mode
PB: Alignment tape, colour bar SP mode, normal VHS
mode
2) Audio circuits
REC : 1KHz, –8 dBs sine wave signal in SP mode, normal
VHS mode
PB: REC then playback it
3) Movie Camera circuits
Measured using a correctly illuminated gray scale or colour
bar test chatrs in the E-E mode
4) Indication on schematic diagram
Waveform indications on the schematic diagram are as
shown below.
1
Non-removable Board connector
2
3
1
2
4
Board to Board
3
Connected pattern on board
The arrows indicate signal path
4. Voltage measurement
1) Video circuits
REC : Colour bar signal in SP mode, normal VHS mode
PB: Alignment tape, colour bar SP mode, normal VHS
mode
—: Unmeasurable or unnecessary to measure
2) Audio circuits
REC : 1KHz, –8 dBs sine wave signal in SP mode, Nor-
mal VHS mode
PB: REC then playback it
3) Movie Camera circuits
Measured using a correctly illuminated gray scale or colour
bar test charts in the E-E mode
5) Waveform indications
Waveform number
WF25
REC/PB 1.2 Vp-p
50 mV/2 msec/DIV
Oscilloscope Volts and Time/Division, Probe 10 : 1
Mode : REC or PB modes
Waveform name or
measurement point
ALC OUT
Level : 1.2 Vp-p
4-1
6. Signal path Symbols
The arrows indicate the signal path as follows.
Playback signal path
Playback and recording signal path
Recording signal path
(including E-E signal path)
Capstan servo path
CIRCUIT BOARD NOTES
1. Foil and Component sides
1) Foil side (B side) :
Parts on the foil side seen from foil face (pattern face)
are indicated.
2) Component side (A side) :
Parts on the component side seen from component face
(parts face) indicated.
Drum servo path
(Example)
R-Y
Playback R-Y signal path
Y
Recording Y signal path
7. Indication of the parts for adjustments
The parts for the adjustments are surrounded with the circle as
shown below.
8. Indication of the parts not mounted on the circuit board
“OPEN” is indicated by the parts not mounted on the circuit
board.
R216
OPEN
2. Parts location guides
Parts location are indicated by guide scale on the circuit board.
REF No. LOCATION
Category: IC
Horizontal “A” zone
Vertical “6” zone
(A : Component side)
(D : Discrete component)
B : Foil side
C : Chip component
IC
IC101B C6 A
Note:
For general information in service manual, please refer
to the Service Manual of GENERAL INFORMATION Edition 4 No. 82054D (January 1994).
C5001 A D 11D
C5002 A D 8C
C5004 A D 9E
C5006 A D 8D
C5007 A D 9D
C5101 A D 6C
C5102 A D 7E
C5103 A D 6C
C5104 A D 7E
C5105 B C 6E
C5106 A D 6B
C5201 A D 4E
C5202 A D 2B
C5203 A D 3E
C5204 A D 2B
C5205 A D 1D
C5206 A D 3A
C5207 A D 4A
C5208 A D 4B
C5210 A D 3A
C5211 A D 2D
C5212 A D 2D
C5213 A D 2E
C5301 A D 4F
C5302 A D 5E
C5303 A D 5E
C5304 A D 4F
C5305 A D 3F
CONNECTOR
CN5001 A D 11B
CN5201 A D 3F
DIODE
D5001 A D 7C
D5101 A D 6B
D5102 A D 6E
D5103 A D 6E
D5104 A D 6C
D5201 A D 4E
D5202 A D 4C
D5203 A D 3D
D5204 A D 4B
D5205 A D 3A
D5206 A D 3B
D5207 A D 4B
D5208 A D 4E
D5210 A D 4B
D5211 A D 5B
D5301 A D 3C
D5303 A D 4A
D5304 A D 5A
D5305 A D 5A
D5306 A D 4F
D5307 A D 2F
D5308 A D 4F
D5309 A D 1C
D5310 A D 1E
C5321 A D 7B
C5322 A D 9C
C5323 A D 9C
C5324 A D 8A
C5325 A D 4D
C5326 A D 3D
C5327 B C 4B
C5328 A D 3C
C5329 B C 5B
C5330 A D 5C
C5331 A D 2D
C5332 A D 6D
C5333 A D 6C
C5334 A D 8C
C5335 A D 9D
CONNECTOR
CN5301 A D 1B
CN5321 A D 6E
CN5322 A D 8E
CN5323 A D 3C
CN5324 A D 2D
CN5325 A D 9E
CN5326 A D 2D
DIODE
D5321 A D 4B
D5322 A D 5D
D5323 A D 3C
D5324 A D 2C
D5325 A D 9B
D5326 A D 9B
D5327 A D 4D
D5328 A D 4D
D5329 A D 4A
D5330 A D 4A
D5331 A D 1C
D5332 A D 6A
D5333 A D 1A
D5334 A D 4E
D5335 A D 1C
D5336 A D 8C
D5337 A D 9C
IC
IC5321 A D 5B
IC5322 A D 4B
COIL
L5321A D 4A
TRANSISTOR
Q5321 A D 7A
Q5322 B C 8B
Q5323 A D 2D
Q5324 B C 2C
Q5326 A D 4D
Q5327 B C 4C
<SW REG>
D5311 A D 3C
D5312 A D 3C
IC
IC5101 A D 7E
IC5301 A D 5F
COIL
L5201A D 2C
L5202A D 2B
L5203A D 2A
L5204A D 3E
L5205A D 2E
TRANSISTOR
Q5301 B C 5F
Q5302 B C 5F
RESISTOR
R5001 A D 9B
R5101 A D 8C
R5102 A D 6E
R5103 B C 7E
R5104 A D 7E
R5105 A D 7E
R5106 A D 5B
R5107 A D 7B
R5302 B C 4D
R5303 B C 4E
R5304 B C 5F
R5305 B C 5E
<REGULATOR>
Q5328 A D 9C
Q5329 B C 9C
Q5330 A D 5C
Q5331 A D 9B
Q5332 B C 9C
Q5333 A D 9C
Q5334 B C 9D
Q5335 A D 4E
Q5336 B C 7E
Q5337 A D 5E
Q5338 B C 9B
Q5339 A D 3D
Q5340 B C 4D
Q5341 B C 7D
RESISTOR
R5322 B C 8B
R5323 B C 8A
R5324 B C 9B
R5325 B C 9A
R5326 B C 4C
R5327 B C 4C
R5328 B C 4C
R5329 B C 3C
R5330 B C 9C
R5331 B C 9C
R5332 B C 2C
R5333 B C 2C
R5334 B C 4C
R5306 A D 5A
R5307 B C 4D
R5308 B C 3F
R5309 B C 3F
R5310 A D 4A
R5311 B C 4A
R5312 B C 5F
R5313 B C 5F
R5314 B C 5F
R5315 B C 4F
R5316 B C 4E
R5317 B C 4F
R5318 B C 5E
OTHER
CP5301 A D 3E
F5001 A D 11C
FC5001 A D 11C
FC5002 A D 11D
K5101 A D 7E
LF5001 A D 10C
LF5002 A D 8B
PC5101 A D 5F
SG5001 A D 9B
T5001 A D 5D
VA5001 A D 10C
VA5002 A D 10A
R5335 B C 4C
R5336 B C 5B
R5337 B C 5C
R5338 B C 9B
R5339 B C 9B
R5340 A D 8B
R5341 B C 6D
R5342 B C 6C
R5343 B C 8C
R5344 B C 9C
R5345 B C 4E
R5346 B C 6E
R5347 B C 4E
R5348 B C 5D
R5349 B C 4C
R5350 B C 5B
R5351 B C 3D
R5352 B C 4D
R5353 B C 5C
VR5321 A D 9B
OTHER
CP5321 A D 3D
CP5322 A D 5D
CP5323 A D 1C
CP5324 A D 8E
C7101 B C5C
C7102 A D5C
C7103 A D5D
C7104 B C6D
C7105 B C5C
C7106 B C6E
C7107 B C7E
C7108 B C6D
C7109 A D6D
C7110 B C5D
C7111 B C6E
C7112 A D6D
C7113 B C6E
C7114 B C5D
C7115 A D5D
C7116 A D7D
C7117 A D7D
C7118 A D3D
C7119 B C3D
C7120 A D4E
C7121 B C4D
C7122 B C3D
C7123 B C4D
C7124 B C4E
C7125 A D9E
C7126 B C9E
C7127 B C10E
C7129 A D10E
C7130 B C 13C
C7131 B C 13D
C7132 B C 13C
C7133 B C 14D
C7134 B C 13C
C7135 B C14E
C7136 B C 13C
C7137 B C13E
C7138 A D 10C
C7139 A D9C
C7140 B C 10C
C7141 B C9D
C7142 B C 10D
C7143 B C 10C
C7144 B C 10C
C7145 B C 10C
C7146 B C 10C
C7147 B C9C
C7148 B C 10C
C7149 B C10B
C7150 B C9D
C7151 A D10B
C7152 A D9B
C7153 A D9C
C7154 B C11A
C7155 A D12A
C7156 B C13B
C7157 B C 13C
C7158 B C13B
C7159 B C14B
C7160 B C13A
C7161 B C 14C
C7162 B C13A
C7163 B C 13C
C7164 B C1B
C7165 B C1C
C7166 B C1B
C7167 B C1C
C7168 A D9E
C7169 B C11E
C7170 B C13B
CONNECTOR
CN7101 A D3A
CN7102 A D9A
CN7103 A D6A
CN7104 A D1A
DIODE
D7101 B C3C
D7103 A D 12D
D7104 A D 12C
IC
IC7101 B C6D
IC7102 B C5D
IC7103 B C4D
IC7104 A D 10C
JACK
J7101 A D7E
J7102 A D12D
J7103 A D7B
J7104 A D12B
J7105 A D2B
COIL
L7101 A D3C
L7102 A D4D
L7103 A D3D
L7104 A D 10D
L7105 A D 13D
L7106 A D 14C
L7107 A D 13C
L7108 A D 14D
L7109 A D 13D
L7110 A D9B
L7111 A D9D
L7112 A D 10C
L7113 A D11C
L7114 A D 10C
L7115 A D11A
L7116 A D 13C
L7117 A D 14B
L7118 A D 13B
L7119 A D 14C
L7120 A D 13C
REF.NO.
LOCATION
L7121 A D1A
L7122 A D1C
L7123 A D1A
TRANSISTOR
Q7102 B C5E
Q7103 B C5E
Q7104 B C4C
Q7105 B C3C
Q7106 B C3C
Q7107 B C3C
Q7108 B C4C
Q7109 B C3B
Q7110 B C3B
Q7111 B C3B
Q7112 B C6C
Q7113 B C5C
Q7114 B C4E
Q7115 B C4E
Q7116 B C10E
Q7117 B C10E
Q7118 B C11A
Q7119 B C11A
Q7120 B C11A
Q7121 B C12B
Q7122 B C9D
Q7123 B C11E
Q7124 B C11E
RESISTOR
R7102 B C5E
R7104 B C5E
R7105 B C5E
R7107 B C4C
R7108 B C3C
R7109 B C4C
R7110 B C3C
R7111 B C3B
R7112 B C3C
R7113 B C3C
R7114 B C3B
R7115 B C3B
R7116 B C3B
R7117 B C3B
R7118 B C3B
R7119 B C3B
R7120 B C3B
R7121 B C5C
R7122 B C6C
R7123 B C5D
R7124 B C7E
R7125 B C5E
R7126 B C3D
R7127 B C4E
R7128 B C4E
R7129 B C5E
R7130 B C10E
R7131 B C10E
R7132 B C10E
R7133 A D9E
R7134 A D 12D
R7135 B C11D
R7136 B C11C
R7137 B C 13C
R7138 B C 14C
R7139 B C 13C
R7140 B C14E
R7141 B C13E
R7142 B C7A
R7143 B C11C
R7144 B C 10C
R7145 B C9D
R7146 B C10B
R7147 B C8B
R7148 B C8B
R7149 B C11A
R7150 B C11A
R7151 B C11A
R7152 B C11A
R7153 B C11A
R7154 B C12A
R7155 B C12A
R7156 B C11C
R7157 B C11B
R7158 B C12B
R7159 B C 12C
R7160 B C14A
R7161 B C13A
R7162 B C 14C
R7163 B C 13C
R7164 B C1A
R7165 B C1C
R7167 B C8C
R7168 B C8D
R7169 A D6B
R7170 B C11E
R7171 B C11E
R7172 B C11E
R7173 B C11D
REF.NO.
LOCATION
RE
4-56
4.28 DISPLAY,EJECT SW, JACK, LED/SW AND JOG CIRCUIT BOARDS