JVC HR-J880EK, HR-J880EU Service Manual
SERVICE MANUAL
VIDEO CASSETTE RECORDER
HR-J880EK/EU
24H EXPRESS
PR
PUSH/TURN
PULL/OPEN
SPECIFICATIONS
GENERAL
Power requirement : AC 220 V – 240 Vd, 50 Hz/60 Hz
Power consumption
Power on : 20 W
Power off : 4.6 W
Temperature
Operating : 5°C to 40°C
Storage : –20°C to 60°C
Operating position : Horizontal only
Dimensions (WxHxD)
Weight : 4.6 kg
Format : VHS PAL standard
Maximum recording time
(SP) : 240 min. with E-240 video cassette
(LP) : 480 min. with E-240 video cassette
(EP) : 720 min. with E-240 video cassette
VIDEO/AUDIO
Signal system : PAL-type colour signal and CCIR
Recording system : DA4 (Double Azimuth) head helical
Signal-to-noise ratio: 45 dB
Horizontal resolution
(SP/LP) : 250 lines
(EP) : 220 lines
Frequency range : 70 Hz to 10,000 Hz (Normal audio)
Input/Output : 21-pin SCART connectors:
(The specifications shown pertain specifically to the model HR-J880EU)
: 435 mm x 105 mm x 343 mm
monochrome signal, 625 lines
50 fields
scan system
20 Hz to 20,000 Hz (Hi-Fi audio)
IN/OUT x 1, IN/DECODER x 1
RCA connectors:
VIDEO IN x 1, AUDIO IN x 1,
AUDIO OUT x 1
TUNER/TIMER
TV channel storage capacity
Tuning system : Frequency synthesized tuner
Channel coverage : VHF 47 MHz – 89 MHz/
Aerial output : UHF channels 22 – 69 (Adjustable)
Memory backup time
ACCESSORIES
Provided accessories
Specifications shown are for SP mode unless otherwise
specified.
E.& O.E. Design and specifications subject to change without
notice.
: 99 positions (+AUX position)
104 MHz – 300 MHz/
302 MHz – 470 MHz
UHF 470 MHz – 862 MHz
: Approx. 10 min.
: RF cable,
Satellite Controller,
Infrared remote control unit,
“R6” battery x 2
No.82868
July 2001
TABLE OF CONTENTS
Section Title Page Section Title Page
Important Safety Precautions
INSTRUCTIONS
1. DISASSEMBLY
1.1 Disassembly flow chart ................................................... 1-1
1.2
How to read the disassembly and assembly ...............................
1-1
1.3 Disassembly /assembly method ......................................1-1
1.4 Service position ............................................................... 1-4
1.4.1 How to set the “Service position” ............................... 1-4
1.4.2 Precautions for cassette loading in the
“Service position”...................................................... 1-4
1.4.3 Cassette loading and ejection methods
in the “Service position”. .......................................... 1-4
1.5 Mechanism service mode ............................................... 1-4
1.5.1 How to set the “Mechanism service mode” ................1-4
1.6 Jig RCU mode ................................................................. 1-4
1.6.1 Setting the Jig RCU mode .........................................1-4
1.6.2 Setting the User RCU mode ......................................1-4
1.7 Emergency display function ............................................1-5
1.7.1 Displaying the EMG information ................................1-5
1.7.2 Clearing the EMG history ...........................................1-5
1.7.3 EMG content description............................................ 1-6
1.7.4 EMG detail information <1> ....................................... 1-7
1.7.5 EMG detail information <2> ....................................... 1-8
1.8 Servicing the video navigation
Function ..................................................................... 1-9
1.8.1 Copying the video navigation data.............................1-9
1.8.2 Erasing the video navigation data (Initialization)...... 1-10
1.8.3 Factory setting level during shipment ......................1-10
2. MECHANISM ADJUSTMENT
2.1 Before starting repair and adjustment ............................. 2-1
2.1.1 Precautions ................................................................ 2-1
2.1.2 Checking for proper mechanical operations ..............2-1
2.1.3 Manually removing the cassette tape ........................2-1
2.1.4 Jigs and tools required for adjustment ....................... 2-2
2.1.5 Maintenance and inspection ...................................... 2-3
2.2 Replacement of major parts ............................................ 2-6
2.2.1 Before starting disassembling
(Phase matching between mechanical parts) ............ 2-6
2.2.2 How to set the “Mechanism assembling mode” ......... 2-6
2.2.3 Cassette holder assembly.......................................... 2-6
2.2.4 Pinch roller arm assembly.......................................... 2-8
2.2.5
Guide arm assembly and press lever assembly ..........
2-8
2.2.6 A/C head .................................................................... 2-8
2.2.7 Loading motor ............................................................ 2-8
2.2.8 Capstan motor ...........................................................2-9
2.2.9 Pole base assembly (supply or take-up side) ............2-9
2.2.10 Rotary encoder ........................................................2-10
2.2.11 Clutch unit ................................................................ 2-10
2.2.12 Change lever assembly,direct gear,clutch gear
and coupling gear ....................................................2-10
2.2.13 Link lever.................................................................. 2-11
2.2.14 Cassette gear,control cam and worm gear .............. 2-11
2.2.15 Control plate............................................................. 2-11
2.2.16 Loading arm gear (supply or take-up side)
and loading arm gear shaft ...................................... 2-12
2.2.17
Take-up lever,take-up head and control plate guide ..........
2-13
2.2.18 Capstan brake assembly .........................................2-13
2.2.19 Sub brake assembly (take-up side) .........................2-13
2.2.20 Main brake assembly (take-up side),
reel disk (take-up side) and
main brake assembly (supply side).......................... 2-13
2.2.21 Tension brake assembly, reel disk (supply side)
and tension arm assembly ....................................... 2-14
2.2.22 Idler lever, idler arm assembly ................................. 2-14
2.2.23 Stator assembly ....................................................... 2-14
2.2.24 Rotor assembly ........................................................ 2-14
2.2.25 Upper drum assembly ..............................................2-15
The following table indicate main different points between models HR-J880EK and HR-J880EU.
ITEM
POWER PLUG 3PIN 2PIN(CEE)
INSTRUCTION LANGUAGE ENGLISH 15 LANGUAGES
MESECAM ON PAL TV NOT USED USED
BROADCASTING STANDARD I B/G, D/K
STEREO DECODER NICAM NICAM/A2
RF OUT SYSTEM I G,K
VCR PLUS+
VPS(AUTO) NOT USED USED
OSD LANGUAGE ENGLISH 13 LANGUAGES
MODEL
HR-J880EK
VIDEOPLUS+ DELUXE
SHOWVIEW DELUXE
2.3 Compatibilltiy adjustment ..............................................2-16
2.3.1 FM waveform linearity ..............................................2-16
2.3.2 Height and tilt of the A/C head ................................. 2-17
2.3.3 A/C head phase (X-value)........................................ 2-17
2.3.4 Standard tracking preset..........................................2-18
2.3.5 Tension pole position ...............................................2-18
3. ELECTRICAL ADJUSTMENT
3.1 Precaution ....................................................................... 3-1
3.1.1 Required test equipments .......................................... 3-1
3.1.2 Required adjustment tools ......................................... 3-1
3.1.3
Color (colour) bar signal,color (colour) bar pattern ...........
3.1.4 Switch settings and standard precautions .................3-1
3.2 Servo circuit .................................................................... 3-2
3.2.1 Switching point...........................................................3-2
3.2.2 Slow tracking preset................................................... 3-2
3.3 Video circuit..................................................................... 3-2
3.3.1 Auto picture initial setting ........................................... 3-2
3.4 Syscon circuit ..................................................................3-2
3.4.1 Timer clock................................................................. 3-2
4. CHARTS AND DIAGRAMS
4.1 BOARD INTERCONNECTIONS .....................................4-3
4.2 MAIN (VIDEO/AUDIO) & AUDIO ERASE
SCHEMATIC DIAGRAMS.......................................... 4-5
4.3 MAIN (SYSCON) SCHEMATIC DIAGRAM .....................4-7
4.4 MAIN (SW.REG) SCHEMATIC DIAGRAM...................... 4-9
4.5 MAIN (TUNER) SCHEMATIC DIAGRAM...................... 4-11
4.6 MAIN (CONNECTION) SCHEMATIC DIAGRAM ..........4-13
4.7 TERMINAL SCHEMATIC DIAGRAM ............................ 4-15
4.8 DEMODULATOR SCHEMATIC DIAGRAM ...................4-17
4.9
NAVIGATION SCHEMATIC DIAGRAM .............................
4.10 SW/DISPLAY, REC SAFETY,
JACK AND ADV JOG SCHEMATIC DIAGRAMS.......... 4-21
4.11 MAIN AND AUDIO ERASE CIRCUIT BOARDS............ 4-23
4.12 TERMINAL CIRCUIT BOARD....................................... 4-26
4.13 SW/DISPLAY, REC SAFETY,
JACK, ADV JOG, DEMODULATOR AND
NAVIGATION CIRCUIT BOARDS................................. 4-27
4.14
REMOTE CONTROLLER SCHEMATIC DIAGRAM ..............
4.15 FDP GRID ASSIGNMET AND
ANODE CONNECTION ....................................... 4-29
4.16 WAVEFORMS ...............................................................4-30
4.17 VOLTAGE CHARTS......................................................4-31
4.18 CPU PIN FUNCTION ....................................................4-32
4.19 SYSTEM CONTROL BLOCK DIAGRAM......................4-33
4.20 VIDEO BLOCK DIAGRAM ............................................4-35
4.21 AUDIO BLOCK DIAGRAM............................................4-37
5. PARTS LIST
5.1 PACKING AND ACCESSORY ASSEMBL Y <M1> ..........5-1
5.2 FINAL ASSEMBLY <M2> ................................................ 5-2
5.3 MECHANISM ASSEMBLY <M4> .................................... 5-4
5.4 ELECTRICAL PARTS LIST............................................. 5-6
MAIN BOARD ASSEMBLY <03> .................................... 5-6
TERMINAL BOARD ASSEMBLY<06>...............................
A/C HEAD BOARD ASSEMBLY<12>................................
DEMODULATOR BOARD ASSEMBLY<14> .....................
NAVIGATION BOARD ASSEMBLY<19> ...........................
DISPLAY BOARD ASSEMBLY<28> ..................................
REC SAFETY BOARD ASSEMBLY<32> ..........................
JACK BOARD ASSEMBLY<36> .......................................
ADV. JOG BOARD ASSEMBLY<38> ................................
A. ERASE BOARD ASSEMBLY<46> ................................
LOADING MOTOR BOARD ASSEMBLY <55>............. 5-15
HR-J880EU
3-1
4-19
4-29
5-12
5-13
5-13
5-14
5-14
5-15
5-15
5-15
5-15
Important Safety Precautions
cut close to connector
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.
v
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
critical for safety.
Replace only with specified part numbers.
Note: Parts in this category also include those specified to com-
ply with X-ray emission standards for products using
cathode ray tubes and those specified for compliance
with various regulations regarding spurious radiation
emission.
3. Fuse replacement caution notice.
Caution for continued protection against fire hazard.
Replace only with same type and rated fuse(s) as specified.
4. Use specified internal wiring. Note especially:
1) Wires covered with PVC tubing
2) Double insulated wires
3) High voltage leads
5. Use specified insulating materials for hazardous live parts.
Note especially:
1) Insulation Tape 3) Spacers 5) Barrier
2) PVC tubing 4) Insulation sheets for transistors
6. When replacing AC primary side components (transformers,
power cords, noise blocking capacitors, etc.) wrap ends of
wires securely about the terminals before soldering.
symbol and shaded ( ) parts are
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).
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
1
S40888-01
v
d'
d
Chassis
Power cord,
primary wire
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
Z
V
Fig. 9
ab
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.
AC inlet
Earth pin
AC Line Voltage
100 V
100 to 240 V
110 to 130 V
110 to 130 V
200 to 240 V
Exposed accessible part
Milli ohm meter
Fig. 10
Region
Japan
USA & Canada
Europe & Australia R 10 MΩ/500 V DC
Region Load Z
Insulation Resistance (R)
≤
R 1 MΩ/500 V DC
≥≥
1 MΩ R 12 MΩ/500 V DC
≤
Table 1 Specifications for each region
Grounding Specifications
Region
USA & Canada
Europe & Australia
Dielectric Strength
AC 1 kV 1 minute
AC 1.5 kV 1 miute
AC 1 kV 1 minute
AC 3 kV 1 minute
AC 1.5 kV 1 minute
(Class 2)
(Class 1)
Grounding Impedance (Z)
≤
Z 0.1 ohm
≤
Z 0.5 ohm
Clearance Distance (d), (d')
≤
d, d' 3 mm
≤
d, d' 4 mm
≤
d, d' 3.2 mm
≤
d 4 mm
≤
d' 8 mm (Power cord)
≤
d' 6 mm (Primary wire)
a, b, cLeakage Current (i)AC Line Voltage
100 V
110 to 130 V
110 to 130 V
220 to 240 V
Note: These tables are unofficial and for reference only. Be sure to confirm the precise values for your particular country and locality.
Japan
USA & Canada
Europe & Australia
Table 2 Leakage current specifications for each region
1 kΩ
0.15 µF
1.5 kΩ
2 kΩ
50 kΩ
2
≤
i 1 mA rms Exposed accessible parts
≤
i 0.5 mA rms
≤
i 0.7 mA peak
≤
i 2 mA dc
≤
i 0.7 mA peak
≤
i 2 mA dc
Exposed accessible parts
Antenna earth terminals
Other terminals
S40888-01
SECTION 1
DISASSEMBLY
1.1 Disassembly flow chart
This flowchart lists the disassembling steps for the cabinet
parts and P. C. boards in order to gain access to item(s) to
be serviced. When reassembling, perform the step(s) in reverse order. Bend, route and dress the flat cables as they
were originally laid.
[1]
Top cover, Bracket
Front panel assembly,
[2]
[3]
[4]
[5]
ADV. Jog board assembly,
Drum assembly
Mechanism assembly
REC safety board assembly,
SW/Display board assembly,
Jack board assembly
[6]
[7]
How to read the disassembly and assembly
1.2
Main board assembly
Bottom cover
<Example>
Step/
Loc No.
[1] Top cover, D1
(1) (2) (3) (4) (5)
Part Name
Bracket 2(S1c)
Fig.
No.
Point Note
4(S1a),(S1b),3(L1a), <Note 1a>
2(SD1a),(P1a),(W1a),
CN1(WR1a),
(1) Order of steps in Procedure
When reassembling, perform the step(s) in the reverse order.
These numbers are also used as the identification (location) No.
of parts Figures.
(2) Part name to be removed or installed.
(3) Fig. No. showing procedure or part location.
(4) Identification of part to be removed, unhooked, unlocked,
released, unplugged, unclamped or unsoldered.
P= Spring, W= Washer, S= Screw, L= Locking tab, SD= Solder,
CN**(WR**)= Remove the wire (WR**) from the connector
(CN**).
Note:
• 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 Disassembly/assembly method
Step/
Loc No.
[1] Top cover, D1 4(S1a), (S1b)
[2] Front panel assembly D2 CN3012(WR2a) <Note 2a>
[3] Drum assembly D3 CON1(WR3a),
[4] Mechanism assembly D4 CN2001(WR4a), <Note 2b>
[5] REC safety board D5 (L5a), <Note 2b>
[6] Main board assemby D6 (S6a),2(S6b),2(S6c)
[7] Bottom cover D7 4(L7a), Foot (rear), <Note 7a>
Part Name
Bracket 2(S1c)
(ADV. Jog board assembly)
assembly, <Note 5a>
SW/Display board
assembly
Jack board assembly
Fig.
No.
Point Note
-----------------
4(L2a), 2(L2b),3(L2c)
-----------------
2(S2a)
CN1(WR3b),
(S3a), (S3b), (S3c)
(S4a), (S4b), <Note 4a>
(S4c), (S4d),2(L4a)
-----------------
CN7001(WR5a),4(L5b)
-----------------
CN7191(WR5b)
4(L7b), Foot ass'y,
2 (S7a), 4 (L7c),
3 (L7d)
<Note 2b>
<Note 2b>
<Note 5b>
<Note 2a>
• When reattaching the Front panel assembly, make sure that
the door opener "a" of the Cassette holder assembly is lowered in position prior to the reinstallation.
• When reattaching the Front panel assembly, pay careful attention to the jack "b" at the Jack board assembly to make it
fit the hole of the Front panel assembly.
<Note 2b>
• Be careful not to damage the connector and wire etc. during
connection and disconnection. When connecting the wire
to the connector, be careful with the wire direction.
<Note 4a>
• When it is required to remove the screws (S4a to S4b) retaining the Mechanism assembly, please refer to the "Procedures for Lowering the Cassette holder assembly". (See
on pages 1-2.)
• When removing the Mechanism assembly only, unhook the
two spacers connecting it with the Main board assembly
with pliers from the back side of the Main board assembly
first, and then remove the Mechanism assembly.
• When reattaching the Mechanism assembly to the Main
board assembly, take care not to damage the sensors and
switch on the Main board assembly.
• The wire (WR4a) has excess length that may be loose, as it
is quite long. After inserting the wire and connectors, the
loose portion of the wire should be taken up and accommodated between the A/C head base and the main deck.
<Note 5a>
• The REC safety board assembly is attached to the SW/Display board assembly. It is therefore necessary to remove
the REC safety board assembly before removing the SW/
Display board assembly.
<Note 5b>
• When reattaching the Jack board assembly, should be attach the Jack board assembly to the Bottom chassis before
attaching the SW/Display board assembly.
<Note 7a>
• When attaching the Bottom cover, make sure that the Earth
plate of the Bottom cover is passed through the hole of the
Bottom chassis and then touches the GND (Ground) on the
Main board assembly.
1-1
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.
a<Note 2a>
b<Note 2a>
(L2a)
(A)
(B)
Fig. 2
Fig. 1
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
(S1a)
(S1b)
[1]
Top cover
(L2a)
CN3012
(L2b)
[2]
Front
panel
(L2c)
(L2b)
WR2a
<Note 2b>
assembly
Front panel
backside
(S2a)
CN7004
WR2a
<Note 2b>
ADV. Jog board
assembly
Fig. D2
Note: When installing the Drum assembly, secure the screws
(S3a to S3c) in the order of a, b, c.
Not used
Drum shield
(S3d)
1-2
(S1c)
Inertia plate
(S3c)
CON1
CN1
(S1c)
[1]
Bracket
(S1a)
(S1a)
Roller arm
assy
Not used
(S3a)
(L3a)
(P3)
(L3b)
[3]
Drum
assembly
Fig. D1 Fig. D3
WR3a
<Note 2b>
(S3b)
WR3b
<Note 2b>
Cleaner assy
(L3c)
Not used
WR4a
[7]
Bottom cover
(L7c)
(L7c)
(L7d)
(L7b)
(L7a)
(L7a)
(L7b)
(S7a)
Foot assy
Foot (rear)
Foot
(rear)
Earth
plate
<Note 7a>
Foot
assy
A/C head base
(S4b)
<Note 4a>
(S4c)
<Note 4a>
Note:
When installing the
Mechanism assembly,
secure the screws
(S4a to S4b) in the
order of a, b.
WR4a
<Note 2b>
(S4a)
(S4d)
(S6c)
(S6b)
(S6b)
Q3003
End sendor
<Note 4a>
(L4a)
Spacer
<Note 4a>
D3001
LED
<Note 4a>
Fig. D4
[4]
Mechanism
assembly
(L4a)
Spacer
<Note 4a>
CN2001
Q3002
Start sensor
<Note 4a>
[6]
Main board
assembly
(S6a)
Fig. D6
WR5b
<Note 2b>
CN7191
[5] Jack board assembly
(L5b)
<Note 5b>
REC Safety
board assembly
<Note 5a>
WR5a
<Note 2b>
Fig. D5
(L5a)
[5] SW/Display board assembly
(L5b)
CN7001
Fig. D7
1-3
1.4 Service position
This unit has been designed so that the Mechanism and
Main board assemblies can be removed together from the
chassis assembly. Before diagnosing or servicing the circuit boards, take out the major parts from the chassis assembly.
1.4.1 How to set the “Service position”
(1) Refer to the disassembly procedure and perform the dis-
assembly of the major parts before removing the Drum
assembly.
(2) Lower the cassette holder to prepare for the removal of
the Mechanism assembly screws. (Refer to the “Procedures for lowering the Cassette holder assembly” of 1.3
Disassembly/assembly method.)
(3) Remove the combined Mechanism and Main board as-
semblies.
(4) If any other major parts are used, remove them also.
(5) Connect the wires and connectors of the major parts that
have been removed in steps (1) to (4). (Refer to Fig.1-4-
1a.)
(6) Place the combined Mechanism, Main board and other
board assemblies upside down.
(7) Insert the power cord plug into the power outlet and then
proceed with the diagnostics and servicing of the board
assembly.
Notes:
• Before inserting the power cord plug into the power
outlet, make sure that none of the electrical parts are
able to short-circuit between the workbench and the
board assembly.
• For the disassembly procedure of the major parts and
details of the precautions to be taken, see “1.3 Disassembly/assembly method”.
• If there are wire connections from the Main board and
Mechanism assemblies to the other major parts, be
sure to remove them ( including wires connected to the
major parts ) first before performing step (2).
• When carrying out diagnosis and repair of the Main board
assembly in the “Service position”, be sure to ground
both the Main board and Mechanism assemblies. If they
are improperly grounded, there may be noise on the playback picture or FDP counter display may move even
when the mechanism is kept in an inoperative status.
• In order to diagnose the playback or recording of the cas-
sette tape, set the Mechanism assembly to the required
mode before placing it upside down. If the mechanism
mode is changed (including ejection) while it is in an upside down position the tape inside may be damaged.
Demod board assembly
Audio Erase board assembly
Navigation board assembly
CN7191
Jack board assembly
CN902
SW/Display board assembly
C3025
TIMER CLOCK
REC Safety
board assembly
TP4001
CTL.P
TP2253
A.FM
Terminal board assembly
TP111
D.FF
TP106
PB.FM
CP4001
CP5302
CP5303
CP5301
CN3011
TPGND
TP7001
(TEST)
CN7001
Main board assembly
CN3012
To ADV.JOG
Fig. 1-4-1a
1-4
1.4.2 Precautions for cassette loading in the “Service position”
The REC safety board assembly detects cassette loading
as well as cassette tabs. Therefore, after the assembly has
been removed in the “Service position”, it is required to set
the switch manually on the REC safety board assembly
when a cassette is loaded.
1.4.3 Cassette loading and ejection methods in the “Service position”.
Insert a cassette halfway in the Cassette holder assembly.
(1)
(2) Set the switch on the REC safety board assembly to on
(by pressing the switch).
As soon as the cassette starts to be loaded, set the switch on
(3)
the REC safety board assembly to off (by releasing the switch).
(4) Now the desired operation (recording, playback, fast for-
ward, rewind, etc.) is possible in this status.
(5)
The switch on the REC safety board assembly does not
have to be operated when ejecting a tape. But be sure to
turn the set to the normal position before ejecting the tape.
Note:
• In the “Service position”, the cassette tabs cannot be
detected and recording becomes possible even with a
cassette with broken tabs such as the alignment tape.
Be very careful not to erase important tapes.
1.5 Mechanism service mode
This model has a unique function to enter the mechanism
into every operation mode without loading of any cassette
tape. This function is called the “Mechanism service mode”.
1.5.1 How to set the “Mechanism service mode”
(1) Unplug the power cord plug from the power outlet.
(2) Connect TPGND and TP7001(TEST) on the board as-
sembly with a jump wire. (Refer to Fig. 1-4-1a.)
(3) Insert the power cord plug into the power outlet.
(4) With lock levers (A) (B) on the left and right of the Cas-
sette holder assembly pulled toward the front, slide the
holder in the same direction as the cassette insertion di-
rection. (For the positions of lock levers (A) (B), refer to
the “Procedures for lowering the Cassette holder assem-
bly” of 1.3 Disassembly/assembly method.)
(5) The cassette holder lowers and, when the loading has
completed, the mechanism enters the desired mode.
1.6 Jig RCU mode
This unit uses the following two modes for receiving remote
control codes.
1) User RCU mode : Ordinary mode for use by the user.
2) Jig RCU mode : Mode for use in production and serv-
icing.
When using the Jig RCU, it is required to set the VCR to the Jig
RCU mode (the mode in which codes from the Jig RCU can be
received). As both of the above two modes are stored in the
EEPROM, it is required to set the VCR back to the User RCU
mode each time that an adjustment is made or to check that the
necessary operations have been completed. These modes can be
set by the operations described below.
1.6.1 Setting the Jig RCU mode
(1) Unplug the power cord plug from the power outlet.
(2) Press and hold the “REC” and “PAUSE” buttons on the
VCR simultaneously, while plugging the power cord plug
into the power outlet.
When the VCR is set to the Jig RCU mode, the symbols
( “ : ” ) in the time display of the FDP are turned off.
1.6.2 Setting the User RCU mode
(1) Turn off the power.
(2) Press the “REC” and “PAUSE” buttons of the VCR si-
multaneously. Alternatively, transmit the code “80” from
the Jig RCU.
1.7 Emergency display function
INITIAL MODE
DATA CODE
CUSTOM CODE
43: A CODE
[Data transmitting method]
Depress the “ ” ( 3 ) button
after the data code is set.
Jig RCU
This unit has a function for storing the history of the past two
emergencies (EMG) and displaying them on each FDP (or
OSD). With the status of the VCR and mechanism at the moment an emergency occurred can also be confirmed.
FDP display model
[FDP display]
0: 00 : 00
Normal display
Notes:
• The EMG detail information <1><2> show the information
on the latest EMG.
It becomes “ – – : – – : – –” when there is no latest EMG
record.
• When using the Jig RCU, it is required to set the VCR to
the Jig RCU mode (the mode in which codes from the Jig
RCU can be received).
E:**:**
*1: *2 : 34
*5: *6 :*7
FDP (7segment LED) display model
[FDP display]
0: 00
E: **
1: **
2: *1
3: *2
4: 34
5: *5
6: *6
7: *7
OSD display model
[OSD display]
EMG content display
(E:Latest:Previous)
EMG detail information <1>
EMG detail information <2>
Normal display
EMG content display (Latest)
EMG content display (Previous)
EMG detail information <1>
[Deck operation mode]
EMG detail information <1>
[Mechanism operation mode]
EMG detail information <1>
[Mechanism sensor information and Mechanism mode position]
EMG detail information <2>
[Type of the cassette tape in use <1>]
EMG detail information <2>
[Winding position of the cassette tape in use]
EMG detail information <2>
[Type of the cassette tape in use <2> (Winding area)]
EMG
E:**:**
*1: *2 : 34
*5: *6 :*7
EMG content display
(E:Latest:Previous)
EMG detail information <1>
EMG detail information <2>
Fig. 1-7a Jig RCU [PTU94023B]
1.7.1 Displaying the EMG information
(1) Transmit the code “59” from the Jig RCU.
The FDP shows the EMG content in the form of “E:**:**”.
<Example 1> E : 01 : 03
Previous EMG
Latest EMG
<Example 2> E : –– : ––
No EMG record
(2) Transmit the code “59” from the Jig RCU again.
The FDP shows the EMG detail information <1> in the form
of “ *1 : *2 : 34 ”.
*1 : Deck operation mode at the moment of EMG
*2 : Mechanism operation mode at the moment of EMG
3– : Mechanism sensor information at the moment of
EMG
–4 : Mechanism mode position at the moment of EMG
(3) Transmit the code “59” from the Jig RCU once again.
The FDP shows the EMG detail information <2> in the form
of “ *5 : *6 : *7 ”.
*5 : Type of the cassette tape in use <1> .
*6 : Winding position of the cassette tape in use
*7 : Type of the cassette tape in use <2> (Winding area)
(4) Transmit the code “59” from the Jig RCU once again to re-
set the display.
Notes:
• For the OSD display model, all EMG information are
showed by transmitting first code from the Jig RCU.
• For the EMG content, see “1.7.3 EMG content description”.
• For the EMG detail information <1> , see “1.7.4 EMG detail information <1> ”.
• For the EMG detail information <2> , see “1.7.5 EMG de-
tail information <2>”.
1.7.2 Clearing the EMG history
(1) Display the EMG history.
(2) Transmit the code “36” from the Jig RCU.
(3) Reset the EMG display.
(EMG-02e)
1-5
1.7.3 EMG content description Note: EMG contents “E08/E09” are for the model with Dynamic Drum (DD).
FDP CONTENT CAUSE
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 wind-
ing due to too large a mechanical load (abnormal tension);
3) The supply reel sensor does not output the FG pulse.
3.
Power is not supplied to the reel sensors.
1.
The drum could not start or the drum rotation has stopped due to too large
a load on the tape, because;
1) The tape tension is abnormally high;
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.
1.
The supply reel pulse is not generated in the FWD transport mode (PLAY/
FWD SEARCH/FF, etc.) because;
1) PLAY/FWD or SEARCH/FF is started while the tape in the inserted cas-
sette is cut in the middle;
2) A mechanical factor caused tape slack inside and outside the supply
reel side of the cassette shell. In this case, the supply reel will not rotate
until the tape slack is removed by the FWD transport, so the pulse is not
generated until then;
3) The FG pulse output from the supply reel sensor is absent.
2.
The take-up reel pulse is not generated in the REV transport mode (REV
SEARCH/REW, etc.).
1) REV SEARCH/REW is started when the tape in the inserted cassette
has been cut in the middle;
2) A mechanical factor caused tape slack inside and outside the take-up
reel side of the cassette shell. In this case, the supply reel will not rotate
until the tape slack is removed by the REV transport, so the pulse will
not be generated until that time;
3) The FG pulse output from the take-up reel sensor is absent.
3.
The power to a reel sensor is not supplied.
1-6
Table 1-7-3a
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