JVC HR-J481MS, HR-J481MS/S Service Manual
SERVICE MANUAL
VIDEO CASSETTE RECORDER
SPECIFICATIONS
GENERAL
Power requirement
Rating :
Operating : AC 90 V – 260 V
Power consumption : 14 W
Tem p er at ur e
Operating : 5°C to 40°C
Storage : –20°C to 60°C
Operating position : Horizontal only
Dimensions (W x H x D) : 360 mm x 94 mm x 247 mm
Weight : 2.9 kg
Format : VHS standard
Maximum recording time
(SP) : 240 min. with E-240 video cassette
: 160 min. with T-160 video cassette
(LP) : 480 min. with E-240 video cassette
(EP) : 480 min. with T-160 video cassette
VIDEO/AUDIO
Signal system : PAL-type colour signal and CCIR
:
Recording system : DA-4 (Double Azimuth) head helical
Signal-to-noise ratio : 45 dB
Horizontal resolution : 250 lines (PAL/MESECAM)
: 220 lines (NTSC)
Frequency range : 70 Hz to 10,00 0Hz
Input/Output : RCA connectors (IN x 2, OUT x 1)
HR-J481MS
AC 110 V – 240 V
(PAL/MESECAM)
(NTSC)
(PAL/MESECAM)
(NTSC)
monochrome signal, 625 lines
50 fields
NTSC colour and EIA monochrome
signals, 525 lines/60 fields
scan system
d
, 50 Hz/60 Hz
d
, 50 Hz/60 Hz
TUNER/TIMER
TV channel storage
capacity
Tuning system : Frequency synthesized tuner
Channel coverage
VHF : (Low) 42 MHz – 175 MHz
UHF : 470 MHz – 870 MHz
Aerial output : UHF channels (Adjustable E28 – E60)
Memory backup time : Approx. 6 months
ACCESSORIES
Provided accessories : RF cable,
*Not provided in certain areas.
Specifications shown are for SP mode unless specified otherwise.
E. & O.E. Design and specifications subject to change without
notice.
: 99 positions (+AUX position)
(High)175 MHz – 470 MHz
Estimated figure based on supplied
fresh battery; actual performance may
differ.
Lithium battery CR2025,
Infrared remote control unit,
“R6/UM-3” battery x 2,
Conversion plug*
No.82870
June 2001
TABLE OF CONTENTS
Section Title Page Section Title Page
Important Safety Precautions
INSTRUCTIONS
1. DISASSEMBLY
1.1 DISASSEBLY FLOW CHART ....................................1-1
HOW TO READ THE DISASSEMBLY AND ASSEMBLY ......
1.2
1.3 DISASSEMBLY /ASSEMBLY METHOD....................1-1
1.4 Service position ......................................................... 1-4
1.4.1 How to set the “Service position”.......................... 1-4
1.5 Mechanism service mode .......................................... 1-4
1.5.1 How to set the “Mechanism service mode”...........1-4
1.6 Jig RCU mode ...........................................................1-4
1.6.1 Setting the Jig RCU mode ....................................1-4
1.6.2 Setting the User RCU mode .................................1-4
1.7 Emergency display function.......................................1-5
1.7.1 Displaying the EMG information ...........................1-5
1.7.2 Clearing the EMG history......................................1-5
1.7.3 EMG content description ...................................... 1-6
1.7.4 EMG detail information <1>.................................. 1-7
1.7.5 EMG detail information <2>.................................. 1-8
2. MECHANISM ADJUSTMENT
2.1 BEFORE STARTING REPAIR AND ADJUSTMENT .2-1
2.1.1 Precautions...........................................................2-1
2.1.2 Checking for proper mechanical operations .........2-1
2.1.3 Manually removing the cassette tape ...................2-1
2.1.4 Jigs and tools required for adjustment..................2-2
2.1.5 Maintenance and inspection .................................2-3
2.2 REPLACEMENT OF MAJOR PARTS .......................2-6
2.2.1 Before starting disassembling
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
2.2.6 Audio control head................................................2-8
2.2.7 Loading motor.......................................................2-8
2.2.8 Capstan motor ......................................................2-9
2.2.9 Pole base assembly (supply or take-up side).......2-9
2.2.10 Rotary encoder ...................................................2-10
2.2.11 Clutch unit ...........................................................2-10
2.2.12 Change lever assembly,direct gear,clutch gear
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)
2.2.17
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),
2.2.21 Tension brake assembly, reel disk (supply side)
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
(Phase matching between mechanical parts).......2-6
Guide arm assembly and press lever assembly.....
and coupling gear ............................................... 2-10
and loading arm gear shaft .................................2-12
Take-up lever,take-up head and control plate guide ....
reel disk (take-up side) and
main brake assembly (supply side) ....................2-13
and tension arm assembly .................................. 2-14
1-1
2-8
2-13
2.3 COMPATIBILL TIY 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
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 settings .................................... 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) SCHEMATIC DIAGRAM ....... 4-5
4.3 MAIN (SYSCON) AND
4.4 MAIN (SW.REG) SCHEMATIC DIAGRAM ................ 4-9
4.5 MAIN (TUNER) SCHEMATIC DIAGRAM ................ 4-11
4.6 MAIN (FRONT) SCHEMATIC DIAGRAM ................ 4-13
4.7 MAIN (TERMINAL) SCHEMATIC DIAGRAMS........4-15
4.8 MAIN AND LT BATTERY CIRCUIT BOARDS .........4-17
4.9
4.10 FDP GRID ASSIGNMET AND
4.11 WAVEFORMS .........................................................4-20
4.12 VOLTAGE CHARTS ................................................4-21
4.13 CPU PIN FUNCTION ..............................................4-22
4.14 SYSTEM CONTROL BLOCK DIAGRAM ................4-23
4.15 VIDEO BLOCK DIAGRAM ......................................4-25
4.16 AUDIO BLOCK DIAGRAM ...................................... 4-27
5. PARTS LIST
5.1 PACKING AND ACCESSOR Y ASSEMBL Y <M1> .....5-1
5.2 FINAL ASSEMBL Y <M2>...........................................5-2
5.3 MECHANISM ASSEMBLY <M4>...............................5-4
5.4 ELECTRICAL PARTS LIST .......................................5-6
Color (colour) bar signal,color (colour) bar pattern ......
LT BATTERY SCHEMATIC DIAGRAMS .............4-7
REMOTE CONTROLLER SCHEMATIC DIAGRAM ...
ANODE CONNECTION..................................4-19
MAIN BOARD ASSEMBLY <03>...............................5-6
AUDIO CONTROL HEAD BOARD ASSEMBLY<12> ..
LOADING MOTOR BOARD ASSEMBLY <55> ....... 5-11
LT BATTERY BOARD ASSEMBLY <93>.................5-11
3-1
4-19
5-11
The following table indicate main different points between models HR-J481MS and HR-J481MS/S.
ITEM
MODEL
HR-J481MS
HR-J481MS/S
POWER CORD CEE(CLSII) SASO(SLSII)
CONVERSION PLUG NOT USED USED
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]
[2]
[3]
[4]
[5]
HOW TO READ THE DISASSEMBLY AND ASSEMBLY
1.2
Top cover, Bracket
Front panel assembly
Drum assembly
Mechanism assembly
Main board assembly
<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 1>
2(SD1a),(P1a),
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 2(S1a)
2 Front panel assembly D2 7(L2) <Note 2a>
3 Drum assembly D3 3(S3),
4 Mechanism assembly D4 2(S4a), (S4b),(S4c) <Note 3>
5 Main board assembly D5 (S5a),(S5b),
Part Name
Bracket 2(S1b)
----------------------------------------
Cleaner assembly (L3C)
Fig.
No.
Point Note
-----------------
CON3(WR3a),
CN3(WR3b)
CN4(WR4) <Note 4>
2(L5a),2(L5b)
<Note 2b>
<Note 3>
<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.
<Note 2b>
• When reattaching the Front panel assembly, pay careful attention to the switch lever not to make it touch the switch
knob b of the Main board assembly from the side.
(If the switch knob of the Main board assembly is damaged,
cassette loading is impossible.)
<Note 3>
• 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 4>
• When it is required to remove the screws (S4a) retaining
the Mechanism assembly, please refer to the “Procedures
for Lowering the Cassette holder assembly”(See on page
1-2).
• When removing the Mechanism assembly only, unhook the
two spacers connecting it with the Main board assembly
with pliers from the back side of the Main board assembly
first, and then remove the Mechanism assembly.
• The wire (WR4) 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.
• 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: End sensor).
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.
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)
1
(L2)
2
2
(L2)
<Note 2a>
(L2)
Fig. D2
Note:
When installing the DRUM assembly, secure the screws
•
(S3) in the order of a , b , c .
Inertia plate
(L3a)
(S3)
WR3a
Foil side
c
a
<Note 3>
CON3
<Note 2b>
1-2
(S1b)
(P3)
(L3b)
3
(S1b)
(S1a)
Roller arm
assy
Not use
1
Bracket
Fig. D1 Fig. D3
CN3
(S3)
b
b
(L3c)
WR3b
Foil side
<Note 3>
Cleaner assy
(WR4)
5
(L5a)
A
(S5a)
(S5b)
(L5b)
A/C head base
Note:
When installing the MECHA assembly, secure the screws
(S4a) in the order of a , b .
Q3002
End sensor
<Note 4>
(S4)
<Note 4>
b
D3001
LED
<Note 4>
(S4b)
CN4
Fig. D4
a
WR4
Foil side
<Note 3>
(S4c)
4
Note 1:
•
Make sure that the (L5a) remains mounted on the main
board during assembly.
Note 2:
•
If you hold with your hands the RF connector and
A , and apply some pressure to turn them
counterclockwise, you can then remove the main board.
Note 3:
•
It is feared that the main board may be broken if it is
removed due to the presence of some cutout blanks,
especially when it is removed with a machine mounted
on it.
Fig. D5
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) Connect the wires and connectors of the major parts that
have been removed in step (1). (Refer to Fig.1-4-1a.)
(5) Place the combined Mechanism and Main board assem-
blies upside down.
(6) Insert the power cord plug into the power outlet and then
proceed with the diagnostics and servicing of the board
assembly.
Notes:
• Before inserting the power cord plug into the power
outlet, make sure that none of the electrical parts are
able to short-circuit between the workbench and the
board assembly.
• For the disassembly procedure of the major parts and
details of the precautions to be taken, see “1.3 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
cassette 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.
1.5 Mechanism service mode
This model has a unique function to enter the mechanism
into every operation mode without loading of any cassette
tape. This function is called the “Mechanism service mode”.
1.5.1 How to set the “Mechanism service mode”
(1) Unplug the power cord plug from the power outlet.
(2) Connect TPGND and TP7001(TEST) on the Main board
assembly with a jump wire.
(3) Insert the power cord plug into the power outlet.
(4) With lock levers (A) (B) on the left and right of the Cas-
sette holder assembly pulled toward the front, slide the
holder in the same direction as the cassette insertion di-
rection. (For the positions of lock levers (A) (B), refer to
the “Procedures for lowering the Cassette holder assem-
bly” of 1.3 Disassembly/assembly method.)
(5) The cassette holder lowers and, when the loading has
completed, the mechanism enters the desired mode.
1.6 Jig RCU mode
This unit uses the following two modes for receiving remote
control codes.
1) User RCU mode: Ordinary mode for use by the user.
2) Jig RCU mode : Mode for use in production and serv-
icing.
When using the Jig RCU, it is required to set the VCR to
the Jig RCU mode (the mode in which codes from the Jig
RCU can be received). As both of the above two modes
are stored in the EEPROM, it is required to set the VCR
back to the User RCU mode each time that an adjustment
is made or to check that the necessary operations have
been completed. These modes can be set by the 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.
1-4
TP4001
CTL.P
TP106
PB.FM
TP111
D.FF
C3018
Timer clock
TPGND
Fig. 1-4-1a
CP4001
CP5302
TP7001
TEST
Main board
assembly
1.7 Emergency display function
This unit has a function for storing the history of the past two
emergencies (EMG) and displaying them on each FDP (or
OSD). With the status of the VCR and mechanism at the moment an emergency occurred can also be confirmed.
FDP display model
[FDP display]
0: 00 : 00
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]
Normal 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>
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).
Jig RCU
[Data transmitting method]
Depress the “ ” ( 3 ) button
after the data code is set.
CUSTOM CODE
43: A CODE
DATA CODE
INITIAL MODE
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
EMG contents “E08/E09” are for the model with Dynamic Drum (DD).
Note:
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.
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 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
Loading...