JVC HR-S6850EU, HR-S6851EU, HR-S6852EU, HR-S6855EK Service Manual
SERVICE MANUAL
VIDEO CASSETTE RECORDER
HR-S6850EU,S6851EU,S5852EU,S6855EK
HR-S6850EU,S6851EU,S6852EU,S6855EK
SPECIFICATIONS
GENERAL
Power requirement : AC 220 V – 240 V
Power consumption
Power on : 22 W
Power off 3.8 W
Temperature
Operating : 5°C to 40°C
Storage : –20°C to 60°C
Operating position : Horizontal only
Dimensions (WxHxD) : 400 mm x 94 mm x 278 mm
Weight : 3.6 kg
Format : S-VHS/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
(The specifications shown pertain specifically to the model HR-S6850EU/S6851EU/6852EU)
`
, 50 Hz/60 Hz
TUNER/TIMER
TV channel storage capacity
: 99 positions (+AUX position)
Tuning system : Frequency synthesized tuner
Channel coverage : VHF 47 MHz – 89 MHz/
104 MHz – 300 MHz/
302 MHz – 470 MHz
UHF 470 MHz – 862 MHz
Aerial output : UHF channels 22 – 69 (Adjustable)
Memory backup time : Approx. 10 min.
ACCESSORIES
Provided accessories : RF cable,
Infrared remote control unit,
“R6” battery x 2
VICTOR COMPANY OF JAPAN, LIMITED
VIDEO DIVISION
S40894
Printed in Japan
No. 82856
VIDEO/AUDIO
Signal system : PAL-type colour signal and CCIR
Recording system :
Signal-to-noise ratio : 45 dB
Horizontal resolution
(SP/LP) : 250 lines (VHS)
(EP) : 220 lines (VHS)
Frequency range : 70 Hz to 10,000 Hz (Normal audio)
Input/Output : 21-pin SCART connectors:
monochrome signal, 625 lines 50 fields
DA4 (Double Azimuth) head helical scan system
400 lines (S-VHS)
350 lines (S-VHS)
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
S-Video connector: IN x 1
This service manual is printed on 100% recycled paper.
COPYRIGHT © 2001 VICTOR COMPANY OF JAPAN, LTD.
Specifications shown are for SP mode unless otherwise specified.
E.& O.E. Design and specifications subject to change without
notice.
No. 82856
May 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
1.5 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 Servicing items related to video navigation .......................... 1-4
1.8 Emergency display function.................................................. 1-5
1.8.1 Displaying the EMG information ...................................... 1-5
1.8.2 Clearing the EMG history ................................................ 1-5
1.8.3 EMG content description ................................................. 1-6
1.8.4 EMG detail information <1> ............................................. 1-7
1.8.5 EMG detail information <2> ............................................. 1-8
2. MECHANISM ADJUSTMENT
2.1 Before starting repair and adjustment ................................... 2-1
2.1.1 Precautions ..................................................................... 2-1
2.1.2 Checking for proper mechanical operations .................... 2-1
2.1.3 Manually removing the cassette tape .............................. 2-1
2.1.4 Jigs and tools required for adjustment............................. 2-2
2.1.5 Maintenance and inspection ............................................ 2-3
2.2 Replacement of major parts ................................................. 2-6
2.2.1 Before starting disassembling (Phase matching between
mechanical parts) ............................................................ 2-6
2.2.2 How to set the “Mechanism assembling mode” ............... 2-6
2.2.3 Cassette holder assembly ............................................... 2-6
2.2.4 Pinch roller arm assembly ............................................... 2-8
2.2.5 Guide arm assembly and press lever assembly .............. 2-8
2.2.6 A/C head ......................................................................... 2-8
2.2.7 Loading motor ................................................................. 2-8
2.2.8 Capstan motor ................................................................. 2-9
2.2.9 Pole base assembly (supply or take-up side) .................. 2-9
2.2.10 Rotary encoder ........................................................... 2-10
2.2.11 Clutch unit ................................................................... 2-10
2.2.12 Change lever assembly, direct gear, clutch gear and
coupling gear .............................................................. 2-10
2.2.13 Link lever..................................................................... 2-11
2.2.14 Cassette gear, control cam and worm gear ................ 2-11
2.2.15 Control plate ............................................................... 2-11
2.2.16 Loading arm gear (supply or take-up side) and
loading arm gear shaft ................................................ 2-12
2.2.17 Take-up lever, take-up head and control plate guide .. 2-13
2.2.18 Capstan brake assembly ............................................ 2-13
2.2.19 Sub brake assembly (take-up side) ............................ 2-13
2.2.20
Main brake assembly (take-up side), reel disk (take-up side)
and main brake assembly (supply side) .................................
2.2.21 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
2.3 Compatibility adjustment .................................................... 2-16
2.3.1 FM waveform linearity ................................................... 2-16
2.3.2 Height and tilt of the A/C head ...................................... 2-17
2.3.3 A/C head phase (X-value) ............................................. 2-17
2.3.4 Standard tracking preset ............................................... 2-18
2.3.5 Tension pole position ..................................................... 2-18
2-13
3. ELECTRICAL ADJUSTMENT
3.1 Precaution ............................................................................ 3-1
3.1.1 Required test equipments ............................................... 3-1
3.1.2 Required adjustment tools ............................................... 3-1
3.1.3 Color (colour) bar signal,Color (colour) bar pattern ......... 3-1
3.1.4 Switch settings and standard precautions ....................... 3-1
3.1.5 EVR Adjustment .............................................................. 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 D/A level .......................................................................... 3-2
3.3.2 EE Y/PB Y (S-VHS/VHS) level ......................................... 3-2
3.3.3 REC color (colour) level................................................... 3-3
3.3.4 Video EQ (Frequency response) ..................................... 3-3
3.3.5 Auto picture initial setting................................................. 3-4
3.4 Audio circuit ............................................................................ 3-4
3.4.1 Audio REC FM................................................................. 3-4
3.5 Syscon circuit ......................................................................... 3-4
3.5.1 Timer clock ...................................................................... 3-4
4. CHARTS AND DIAGRAMS
NOTES OF SCHEMATIC DIAGRAM .......................................... 4-1
CIRCUIT BOARD NOTES ........................................................... 4-2
4.1 BOARD INTERCONNECTIONS .......................................... 4-3
4.2 MAIN (VIDEO/AUDIO) SCHEMATIC DIAGRAM .................. 4-5
4.3 MAIN (ON SCREEN) SCHEMATIC DIAGRAM .................... 4-7
4.4 MAIN (SYSCON) SCHEMATIC DIAGRAM .......................... 4-9
4.5 MAIN (SW.REG) SCHEMATIC DIAGRAM ......................... 4-11
4.6 MAIN (TUNER) SCHEMATIC DIAGRAM ........................... 4-13
4.7 MAIN (SW/DISPLAY), S-JACK AND ADV.JOG
SCHEMATIC DIAGRAMS ................................................... 4-15
4.8 MAIN (MAIN TERMINAL) SCHEMATIC DIAGRAM ............ 4-17
4.9 2D DIGITAL SCHEMATIC DIAGRAM ................................. 4-19
4.10 TERMINAL (S-SUB) SCHEMATIC DIAGRAM ................. 4-21
4.11 TERMINAL (I/O) SCHEMATIC DIAGRAM ....................... 4-23
4.12 DEMODULATOR SCHEMATIC DIAGRAM ...................... 4-25
4.13 2D DIGITAL AND DEMODULATOR CIRCUIT BOARDS . 4-27
4.14 TERMINAL CIRCUIT BOARD ......................................... 4-28
4.15 MAIN CIRCUIT BOARD................................................... 4-29
4.16 REMOTE CONTROLLER SCHEMATIC DIAGRAM ......... 4-32
4.17 FDP GRID ASSIGNMENT AND ANODE CONNECTION 4-33
4.18 WAVEFORMS .................................................................. 4-34
4.19 VOLTAGE CHARTS ......................................................... 4-36
4.20 CPU PIN FUNCTION ....................................................... 4-37
4.21 SYSTEM CONTROL BLOCK DIAGRAM......................... 4-39
4.22 VIDEO BLOCK DIAGRAM ............................................... 4-41
4.23 AUDIO BLOCK DIAGRAM............................................... 4-45
5. PARTS LIST
5.1 PACKING AND ACCESSORY ASSEMBLY <M1> ............... 5-1
5.2 FINAL ASSEMBLY <M2> .................................................... 5-2
5.3 MECHANISM ASSEMBLY <M4> ........................................ 5-4
5.4 ELECTRICAL PARTS LIST .................................................. 5-6
MAIN BOARD ASSEMBLY <03> ............................................... 5-6
2D DIGITAL BOARD ASSEMBLY <05>................................... 5-13
TERMINAL BOARD ASSEMBLY <06> ................................... 5-14
A/C HEAD BOARD ASSEMBLY <12> ..................................... 5-16
DEMOD BOARD ASSEMBLY <14> ........................................ 5-16
S.JACK BOARD ASSEMBLY <36> ......................................... 5-16
ADV.JOG BOARD ASSEMBLY <38> ....................................... 5-16
LOADING MOTOR BOARD ASSEMBLY <55> ....................... 5-16
The following table lists the differing points between Models ( HR-S6850EU, HR-S6851EU, HR-S6852EU and HR-S6855EK) in this series.
HR-S6850EU HR-S6851EU HR-S6852EU HR-S6855EK
VIDEO SYSTEM
BROADCASTING STANDARD B/G,D/K B/G,D/K B/G,D/K I
STEREO DECODER NICAM/A2 NICAM/A2 NICAM/A2 NICAM
RF OUT SYSTEM [INITIAL] G,K G,K G,K I
VCR PLUS+ SHOWVIEW DELUXE SHOWVIEW DELUXE SHOWVIEW DELUXE VIDEOPLUS+ DELUXE
VPS(AUTO) USED USED USED NOT USED
INITIAL (TIMER) GER,AUS,SWISS:ON, GER,AUS,SWISS:ON, GER,AUS,SWISS:ON, OFF
CABLE BOX OR DBS. BOX OR SAT CTL
LANGUAGE [INITIAL] 13 LANG. [E] 13 LANG. [E] 13 LANG. [E] ENG
(ON SCREEN DISPLAY)
GOST USED NOT USED NOT USED NOT USED
FRONT PANEL COLOR PURE SILVER PURE SILVER BLACK PURE SILVER
WINDOW COLOR SMOKE LIGHT GRAY GREEN SMOKE PINK CLEAR
CABLE MOUSE OPTION OPTION OPTION PROVIDED
PAL/MESECAM(MANUAL) PAL/MESECAM(MANUAL) PAL/MESECAM(MANUAL)
/NTSC ON PAL TV /NTSC ON PAL TV /NTSC ON PAL TV
OTHER:OFF OTHER:OFF OTHER:OFF
READY READY READY USED
PAL/NTSC ON PAL TV
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 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.
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
.2
5
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 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]
Top cover, Bracket
Front panel assembly,
ADV. Jog board assembly,
S Jack board assembly
[3]
[4]
[5]
[6]
1.2
How to read the disassembly and assembly
Drum assembly
Mechanism assembly
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 assigned 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 CN7001(WR2a), <Note 2a>
[3] Drum assembly D3 CON1(WR3a),
[4] Mechanism assembly D4 CN2001(WR4a), <Note 2c>
[5] Main board assembly D5 7(L5a),
[6] Bottom cover D6 2(L6a), 9(L6b) <Note 6a>
Part Name
Bracket 2(S1c)
ADV. Jog board assembly
S Jack board assembly
(Inertia plate) 4(L3a)
(Roller arm assy) (P3), (L3b)
Fig.
No.
Point Note
-----------------
CN916(WR2b), <Note 2b>
4(L2a), 3(L2b) <Note 2c>
-----------------
2(S2a)
-----------------
2(S2b)
CN1(WR3b),
(S3a), (S3b), (S3c)
-----------------
-----------------
(S4a),(S4b), <Note 4a>
(S4c), (S4d)
(S5a), 3(S5b)
<Note 2c>
<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.
<Note 2c>
• Be careful not to damage the connector and wire etc. during
connection and disconnection.
When connecting the wire to the connector, be careful with
the wire direction.
<Note 4a>
• When it is required to remove the screws (S4a to S4b) retaining the Mechanism assembly, please refer to the “Procedures for Lowering the Cassette holder assembly”(See
on page 1-2).
• When reattaching the Mechanism assembly to the Main
board assembly, take care not to damage the sensors and
switch on the Main board assembly.
• 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 (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 6a>
When removing the bottom cover, push down the two tabs
(L6a) to slide the bottom cover.
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.
(S2b)
Front panel
back side
CN7108
WR2b
S Jack
board assembly
<Note 2c>
(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
(L2a)
CN916
CN7001
b <Note 2b>
a <Note 2a>
WR2a
<Note 2c>
WR2b
<Note 2c>
[2]
Front panel
assembly
(L2b)
CN7003
(S2a)
ADV. Jog board
assembly
(L2a)
WR2a
<Note 2c>
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
(S1a)
(S1c)
(S1b)
[1]
Top cover
Inertia plate
(S3c)
(S3a)
(S1c)
[1]
Bracket
(S1a)
(S1a)
Roller arm
assy
(L3a)
(P3)
(L3b)
[3]
Drum
assembly
CON1
CN1
Fig. D1 Fig. D3
(S3d)
WR3a
<Note 2c>
(S3b)
WR3b
<Note 2c>
Cleaner assy
(L3c)
Not used
1-2
WR4a
(S4b)
<Note 4a>
A/C head base
(S4c)
Note:
When installing the
Mechanism assembly,
secure the screws
(S4a to S4b) in the
order of a, b.
WR4a
<Note 2c>
(S4a)
<Note 4a>
(S4d)
Q3003
End sensor
<Note 4a>
(L4)
Spacer
<Note 4a>
S3002
S cassette switch
<Note 4a>
(S5a)
D3001
LED
<Note 4a>
Fig. D4
CN2001
Q3002
Start sensor
<Note 4a>
[4]
Mechanism
assembly
(L4)
Spacer
<Note 4a>
(S5b)
(L6b)
Fig. D6
(L6b)
(L6a)
<Note 6a>
(L6b)
[6]
Bottom cover
Fig. D5
(L5a)
[5]
Main board
assembly
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 “Proce-
dures for lowering the Cassette holder assembly” of 1.3
Disassembly/assembly method.)
(3) Remove the combined Mechanism and Main board as-
semblies.
(4) Connect the wires and connectors of the major parts that
have been removed in step (1). (Refer to Fig.1-4-1a.)
(5) Place the combined Mechanism and Main board assem-
blies upside down.
(6) Insert the power cord plug into the power outlet and then
proceed with the diagnostics and servicing of the board
assembly.
Notes:
• Before inserting the power cord plug into the power
outlet, make sure that none of the electrical parts are
able to short-circuit between the workbench and the
board assembly.
• For the disassembly procedure of the major parts and
details of the precautions to be taken, see “1.3 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.
Terminal board
assembly
CN916
TP106
TP4001
PB. FM
CTL. P
TP111
S Jack board
assembly
D.FF
CP4001
TP2253
A.PB.
FM
VR1201
D/A LEVEL ADJ
Demodulator board
assembly
C3025
Timer Clock
2D Digital board
assembly
TPGND
CP3002
ADV. Jog board
assembly
CN7001
TP7001
TEST
Main
board
assembly
Fig. 1-4-1a
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.
1.7 Servicing items related to video navigation
The video navigation function built into this unit works by
storing the video navigation data in the internal EEPROM
and writing data in the cassette tape simultaneously.
The video navigation data stored in the EEPROM cannot be
copied to another EEPROM. Therefore, when the circuit board
mounting the EEPROM is replaced, the original EEPROM
should be mounted on the new board. This will make the user’s video navigation data usable with the new circuit board
after replacement. However, the user’s data cannot be restored
if the EEPROM on the original circuit board is damaged.
Note:
If the circuit board mounting the EEPROM or the
•
EEPROM alone has been replaced, it is required to perform confirmation/re-adjustment on all of the adjustment items using the EVR as well as those which are
adjusted by transmitting adjustment codes from the Jig
RCU.
1-4
1.8 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. 1-8a Jig RCU [PTU94023B]
1.8.1 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 “1.8.3 EMG content description”.
•
For the EMG detail information <1> , see “1.8.4 EMG detail information <1> ”.
•
For the EMG detail information <2> , see “1.8.5 EMG detail information <2>”.
1.8.2 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
1.8.3 EMG content description
Note:
EMG contents “E08/E09” are for the model with Dynamic Drum (DD).
FDP CONTENT CAUSE
1.
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.
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.
4.
The absolute value sensor data is not sent to the System Controller CPU.
1. The FG sensor is defective. (The soldered parts have separated.)
2. The pull-up resistor at the FG sensor output is defective. (The soldered parts have
separated.)
3. Contact failure or soldering failure of the pins of the connector (board-to-board) to the FG sensor.
4. The power to the sensor is not supplied. (Connection failure/soldering failure)
5. The FG pulse is not sent to the System Controller CPU.
6.
The tilt motor is defective. (The soldered parts have separated.)
7. The drive power to the tilt motor is not supplied. (Connection failure/soldering failure)
8. The tilt motor drive MDA - IC is defective.
9. Auto-recovery of the DD tilting cannot take place due to overrun.
1.
The supply reel pulse is not generated in the FWD transport mode (PLAY/
FWD SEARCH/FF, etc.) because;
1) PLAY/FWD or SEARCH/FF is started while the tape in the inserted cas-
sette is cut in the middle;
2) A mechanical factor caused tape slack inside and outside the supply
reel side of the cassette shell. In this case, the supply reel will not rotate
until the tape slack is removed by the FWD transport, so the pulse is not
generated until then;
3) The FG pulse output from the supply reel sensor is absent.
2.
The take-up reel pulse is not generated in the REV transport mode (REV
SEARCH/REW, etc.).
1) REV SEARCH/REW is started when the tape in the inserted cassette
has been cut in the middle;
2) A mechanical factor caused tape slack inside and outside the take-up
reel side of the cassette shell. In this case, the supply reel will not rotate
until the tape slack is removed by the REV transport, so the pulse will
not be generated until that time;
3) The FG pulse output from the take-up reel sensor is absent.
3.
The power to a reel sensor is not supplied.
1-6
Table 1-8-3a
1.8.4 EMG 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 EMG can be confirmed based on the
figure in EMG detail information <1> .
[FDP/OSD display]
* 1 : * 2 : 34
* 1 : Deck operation mode at the moment of EMG
* 2 : Mechanism operation mode at the moment of EMG
3– : Mechanism sensor information at the moment of EMG
–4 : Mechanism mod
e position at the moment of EMG
Note:
For EMG detailed information <1>, the content of the code
•
that is shown on the FDP (or OSD) differs depending on
the parts number of the system control microprocessor
(IC3001) of the VCR. The system control microprocessor
parts number starts with two letters, refer these to the corresponding table.
* 1 : Deck operation mode
[Common table of MN*, HD* and M3*]
Display
MN*/M3* HD*
00 - Mechanism being initialized
01 00 STOP with pinch roller pressure off (or tape present with P.OFF)
02 01 STOP with pinch roller pressure on
03 - POWER OFF as a result of EMG
04 04 PLAY
0C 0E REC
10 11 Cassette ejected
20 22 FF
21 - Tape fully loaded, START sensor ON, short FF
22 - Cassette identification FWD SEARCH before transition to FF (SP
24 26 FWD SEARCH (variable speed) including x2-speed
2C 2E INSERT REC
40 43 REW
42 - Cassette identification REV SEARCH before transition to REW (SP
44 47 REV SEARCH (variable speed)
4C 4C AUDIO DUB
6C 6E INSERT REC (VIDEO + AUDIO)
84 84 FWD STILL / SLOW
85 85 REV STILL / SLOW
8C 8F REC PAUSE
8D - Back spacing
8E - Forward spacing (FWD transport mode with BEST function)
AC AF INSERT REC PAUSE
AD - INSERT REC back spacing
CC CD AUDIO DUB PAUSE
CD - AUDIO DUB back spacing
EC EF INSERT REC (VIDEO + AUDIO) PAUSE
ED - INSERT REC (VIDEO + AUDIO) back spacing
x7-speed)
x7-speed)
Deck operation mode
* 2 : Mechanism operation mode
[Common table of MN* and M3*]
Display
MN* M3*
00 00 Command standby (Status without executing command)
02 02 POWER OFF by EMG occurrence
04 04 Moving to the adjacent position in the LOAD direction
06 06 Moving to the adjacent position in the UNLOAD direction
08 08 Cassette ejection being executed / Cassette housing ejection being
- 0A Mode transition to STOP with cassette ejection end
0A 0C Cassette insertion being executed
0C 0E Tape being loaded
0E 10 Tape being unloaded
10 12 Mode transition to STOP with pinch roller compression ON
12 14 Mode transition to STOP with pinch roller compression OFF
14 16
16 18
18 1A Mode transition to PLAY
1A 1C Mode transition to FWD SEARCH
1C 1E Mode transition to REC
1E 20 Mode transition to FWD STILL / SLOW
20 22 Mode transition to REV STILL / SLOW
22 24 Mode transition to REV SEARCH
24 26 Mode transition from FF / REW to STOP
26 28 Mode transition to FF
28 2A Mode transition to REW
2A 2C 4 sec. of REV as a result of END sensor going ON during loading
2C 2E
2E 30 Mechanism position being corrected due to overrun
80 80 Mechanism in initial position (Dummy command)
executed
Mode transition to STOP with pinch roller compression OFF as a result
of POWER OFF
Mode transition to STOP with pinch roller compression ON as a result
of POWER ON
Short FF / REV as a result of END sensor going ON during unloading
Mechanism operation mode
[Table of HD*]
Display
00 STOP with pinch roller pressure off
01 STOP with pinch roller pressure on
02 U/L STOP (or tape being loaded)
04 PLAY
05 PLAY (x1-speed playback using JOG)
0E REC
11 Cassette ejected
22 FF
26 FWD SEARCH (variable speed) including x2-speed
2E INSERT REC
43 REW
47 REV SEARCH
4C AUDIO DUB
6E INSERT REC (VIDEO + AUDIO)
84 FWD STILL/SLOW
85 REV STILL/SLOW
8F REC PAUSE
AF INSERT REC PAUSE
C7 REV SEARCH (x1-speed reverse playback using JOG)
CD AUDIO DUB PAUSE
EF INSERT REC (VIDEO + AUDIO) PAUSE
F0 Mechanism being initialized
F1 POWER OFF as a result of EMG
F2 Cassette being inserted
F3 Cassette being ejected
F4 Transition from STOP with pinch roller pressure on to STOP with pinch
roller pressure off
F5 Transition from STOP with pinch roller pressure on to PLAY
F6 Transition from STOP with pinch roller pressure on to REC
F7 Cassette type detection SEARCH before FF/REW is being executed
F8 Tape being unloaded
F9 Transition from STOP with pinch roller pressure off to STOP with pinch
roller pressure on
FA Transition from STOP with pinch roller pressure off to FF/REW
FB Transition from STOP with pinch roller pressure off to REC.P (T.REC,etc.)
FC Transition from STOP with pinch roller pressure off to cassette type de-
tection SEARCH
FD Short REV being executed after END sensor on during unloading
FE Tension loosening being executed after tape loading (STOP with pinch
roller pressure on)
Mechanism operation mode
1-7
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