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VX-FT21
Service Manual
114 pgs4.27 Mb0

Aiwa VX-FT21 Service Manual

VX-FT21
KL
SERVICE MANUAL
INTEGRATED COLOR TV/STEREO
VIDEO CASSETTE RECORDER
POWER REQUIREMENTS............
POWER CONSUMPTION..............
WEIGHT .........................................
DIMENSIONS.................................
PICTURE TUBE .............................
TUNER SYSTEM ...........................
CHANNEL COVERAGE.................
TV SYSTEM ...................................
HORIZONTAL RESOLUTION .......
OPERATING TEMPERATURE......
VIDEO RECORDING SYSTEM .....
VIDEO SIGNAL SYSTEM ..............
VIDEO HEAD .................................
USABLE CASSETTES...................
SPECIFICATIONS
BASIC TAPE MECHANISM : OVD-6S
TAPE SPEED ...................................
RECORDING/PLAYBACK TIME .....
VIDEO INPUT...................................
VIDEO OUTPUT ..............................
VIDEO S/N .......................................
AUDIO INPUT ..................................
AUDIO OUTPUT ..............................
AUDIO TRACK .................................
PAL SP: 23.39 mm/sec. LP: 11.69 mm/sec. NTSC (playback SP only)
33.35 mm/sec. PAL SP: 5 hours max. with E-300 tape LP: 10 hours max. with E-300 tape NTSC (playback SP only) 3 hours 30 minutes max. with T-210 tape
1.0Vp-p, 75 ohm, unbalanced
1.0Vp-p, 75 ohm, unbalanced 53dB (nominal) SCART: –3.8 dBs, 50K ohm RCA: –3.8 dBs, 50K ohm SCART: –3.8 dBs less than 1K ohm 3 tracks (Hi-Fi sound 2 tracks, Normal sound 1 track)
Design and specifications are subject to change without
•
notice.
S/M Code No. 09-00A-350-2N1
DATA
TABLE OF CONTENTS
SPECIFICATIONS ..............................................................................................................................................................
TABLE OF CONTENTS ......................................................................................................................................................
SERVICING NOTICES ON CHECKING .............................................................................................................................
DISASSEMBLY INSTRUCTIONS
REMOVAL OF MECHANICAL PARTS AND P.C. BOARDS...........................................................................................
REMOVAL OF DECK PARTS .........................................................................................................................................
REMOVAL OF ANODE CAP ...........................................................................................................................................
KEY TO ABBREVIATIONS .................................................................................................................................................
SERVICE MODE LIST ........................................................................................................................................................
PREVENTIVE CHECKS AND SERVICE INTERVALS .......................................................................................................
NOTE FOR THE REPLACING OF MEMORY IC................................................................................................................
SERVICING FIXTURES AND TOOLS................................................................................................................................
PREPARATION FOR SERVICING .....................................................................................................................................
VCR TEST TAPE INTERCHANGEABILITY TABLE ...........................................................................................................
MECHANICAL ADJUSTMENTS
CONFIRMATION AND ADJUSTMENT ...........................................................................................................................
CONFIRMATION AND ADJUSTMENT OF TAPE RUNNING MECHANISM ..................................................................
MECHANISM ADJUSTMENT PARTS LOCATION GUIDE .............................................................................................
ELECTRICAL ADJUSTMENTS
ADJUSTMENT PROCEDURE.........................................................................................................................................
BASIC ADJUSTMENTS ..................................................................................................................................................
ELECTRICAL ADJUSTMENT PARTS LOCATION GUIDE.............................................................................................
PURITY AND CONVERGENCE ADJUSTMENTS ..........................................................................................................
TROUBLESHOOTING GUIDES .........................................................................................................................................
IC DESCRIPTIONS ............................................................................................................................................................
SERVO TIMING CHART ....................................................................................................................................................
SYSTEM SWITCH MODE ..................................................................................................................................................
SEMICONDUCTOR BASE CONNECTIONS......................................................................................................................
BLOCK DIAGRAMS
TV ....................................................................................................................................................................................
Y/C/AUDIO/HEAD AMP...................................................................................................................................................
MICON/OPERATION.......................................................................................................................................................
IF/21PIN/IN/OUT/POWER...............................................................................................................................................
T'TEXT.............................................................................................................................................................................
TUNER/HIFI/STEREO .....................................................................................................................................................
PRINTED CIRCUIT BOARDS (OPERATION/TV POWER/DECK).....................................................................................
OPERATION SCHEMATIC DIAGRAM ...............................................................................................................................
CHOKE COIL SCHEMATIC DIAGRAM ..............................................................................................................................
DECK SCHEMATIC DIAGRAM ..........................................................................................................................................
PRINTED CIRCUIT BOARDS (IF/STEREO) ......................................................................................................................
IF DIAGRAM .......................................................................................................................................................................
STEREO DIAGRAM ...........................................................................................................................................................
PRINTED CIRCUIT BOARDS (SYSCON/SUB POWER) ...................................................................................................
Y/C/AUDIO/HEAD AMP SCHEMATIC DIAGRAM ..............................................................................................................
MICON SCHEMATIC DIAGRAM ........................................................................................................................................
POWER SCHEMATIC DIAGRAM ......................................................................................................................................
21PIN IN/OUT SCHEMATIC DIAGRAM .............................................................................................................................
CHROMA/IF SCHEMATIC DIAGRAM ................................................................................................................................
SOUND AMP SCHEMATIC DIAGRAM ..............................................................................................................................
T'TEXT SCHEMATIC DIAGRAM ........................................................................................................................................
TUNER/HI-FI SCHEMATIC DIAGRAM...............................................................................................................................
REGULATOR SCHEMATIC DIAGRAM..............................................................................................................................
PRINTED CIRCUIT BOARDS (MAIN/CRT/POWER SW) ..................................................................................................
TV POWER SCHEMATIC DIAGRAM .................................................................................................................................
DEFLECTION SCHEMATIC DIAGRAM .............................................................................................................................
CRT SCHEMATIC DIAGRAM.............................................................................................................................................
INTERCONNECTION DIAGRAM .......................................................................................................................................
WAVEFORMS ....................................................................................................................................................................
MECHANICAL EXPLODED VIEW......................................................................................................................................
MECHANICAL REPLACEMENT PARTS LIST ...................................................................................................................
ACCESSORY REPLACEMENT PARTS LIST ....................................................................................................................
CHASSIS EXPLODED VIEW (TOP VIEW) ........................................................................................................................
CHASSIS EXPLODED VIEW (BOTTOM VIEW) ................................................................................................................
CHASSIS REPLACEMENT PARTS LIST...........................................................................................................................
ELECTRICAL REPLACEMENT PARTS LIST ....................................................................................................................
COVER A1-1 A2-1
B1-1, B1-2 B2-1~B2-5 B3-1 C1-1, C1-2 C2-1 C3-1, C3-2 C4-1 C5-1 C5-2, C5-3 C6-1
D1-1, D1-2 D1-2, D1-3 D1-4
D2-1 D2-1~D2-5 D2-6, D2-7 D2-8 E-1~E-27 F1-1~F1-3 F2-1 F2-2 G-1
H-1 H-2 H-3 H-4 H-5 H-6 I-1 I-2 I-3 I-4 I-5~I-7 I-8 I-9 I-10~I-12 I-13 I-14 I-15 I-16 I-17 I-18 I-19 I-20 I-21 I-22 I-23 I-24 I-25 I-26 J-1~J-4 K1-1, K1-2 K1-3 K1-3 K2-1 K2-2 K2-3 K3-1~K3-6
A1-1
SERVICING NOTICES ON CHECKING
1. KEEP THE NOTICES
As for the places which need special attentions, they are indicated with the labels or seals on the cabinet, chassis and parts. Make sure to keep the indications and notices in the operation manual.
2. AVOID AN ELECTRIC SHOCK
There is a high voltage part inside. Avoid an electric shock while the electric current is flowing.
3. USE THE DESIGNATED PARTS
The parts in this equipment have the specific characters of incombustibility and withstand voltage for safety. Therefore, the part which is replaced should be used the part which has the same character. Especially as to the important parts for safety which is indicated in the circuit diagram or the table of parts as a mark, the designated parts must be used.
4. PUT PARTS AND WIRES IN THE ORIGINAL POSITION AFTER ASSEMBLING OR WIRING
There are parts which use the insulation material such as a tube or tape for safety, or which are assembled in the condition that these do not contact with the printed board. The inside wiring is designed not to get closer to the pyrogenic parts and high voltage parts. Therefore, put these parts in the original positions.
5. TAKE CARE TO DEAL WITH THE CATHODE-RAY TUBE
In the condition that an explosion-proof cathode-ray tube is set in this equipment, safety is secured against implosion. However, when removing it or serving from backward, it is dangerous to give a shock. Take enough care to deal with it.
6. AVOID AN X-RAY
Safety is secured against an X-ray by considering about the cathode-ray tube and the high voltage peripheral circuit, etc. Therefore, when repairing the high voltage peripheral circuit, use the designated parts and make sure not modify the circuit. Repairing except indicates causes rising of high voltage, and it emits an X-ray from the cathode-ray tube.
PERFORM A SAFETY CHECK AFTER
7. SERVICING
Confirm that the screws, parts and wiring which were removed in order to service are put in the original positions, or whether there are the portions which are deteriorated around the serviced places serviced or not. Check the insulation between the antenna terminal or external metal and the AC cord plug blades. And be sure the safety of that.
(INSULATION CHECK PROCEDURE)
1.
Unplug the plug from the AC outlet.
2.
Remove the antenna terminal on TV and turn on the TV.
3.
Insulation resistance between the cord plug terminals and the eternal exposure metal [Note 2] should be more than 1M ohm by using the 500V insulation resis­tance meter [Note 1].
4.
If the insulation resistance is less than 1M ohm, the inspection repair should be required.
[Note 1]
If you have not the 500V insulation resistance meter, use a Tester.
[Note 2]
External exposure metal: Antenna terminal
Earphone jack
A2-1
DISASSEMBLY INSTRUCTIONS
1. REMOVAL OF MECHANICAL PARTS AND P.C. BOARDS
1-1: BACK CABINET (Refer to Fig. 1-1)
1.
Remove the 2 screws 1.
2.
Remove the 4 screws 2.
3.
Remove the 2 screws 3 which are used for holding the Back Cabinet.
4.
Remove the AC cord from the AC cord hook 4.
5.
Remove the Back Cabinet in the direction of arrow.
Front Cabinet
1
1
2
2
2
3
3
2
1-2: CRT PCB (Refer to Fig. 1-2) CAUTION: BEFORE REMOVING THE ANODE CAP,
DISCHARGE ELECTRICITY BECAUSE IT CONTAINS HIGH VOLTAGE. BEFORE ATTEMPTING TO REMOVE OR REPAIR ANY PCB, UNPLUG THE POWER CORD FROM THE AC SOURCE.
1.
Remove the Anode Cap. (Refer to REMOVAL OF ANODE CAP)
2.
Disconnect the following connectors: (CP802 and CP805).
3.
Remove the CRT PCB in the direction of arrow.
4
Back Cabinet
Fig. 1-1
1-3: TV/VCR BLOCK (Refer to Fig. 1-3)
1.
Remove the 2 screws 1.
2.
Disconnect the following connectors: (CP353, CP502, CP503, CP504, CP755 and CP4202).
3.
Unlock the support 2.
4.
Remove the TV/VCR Block in the direction of arrow.
1
1
Front Cabinet
2
UP TO RELEASE
TV/VCR Block
1-4: MAIN PCB (Refer to Fig. 1-4)
1.
Remove the screw 1.
2.
Remove the Main PCB Holder.
3.
Remove the 2 screws 2.
4.
Remove the 3 screws 3.
5.
Disconnect the following connectors: (CP402, CP810 and CP820).
6.
Remove the Main PCB in the direction of arrow.
2
3
2
Main PCB
Main PCB Holder
1
3
3
Fig. 1-3
Front Cabinet
CRT PCB
VCR Block
Fig. 1-4
Fig. 1-2
B1-1
DISASSEMBLY INSTRUCTIONS
1-5: DECK SHIELD PLATE (Refer to Fig. 1-5)
1.
Remove the 2 screws 1.
2.
Remove the 2 screws 2.
3.
Remove the Deck Shield Plate in the direction of arrow (A).
4.
Remove the screw 3.
5.
Remove the Shield Plate Bottom in the direction of arrow (B).
Deck Shield Plate
1
1
(A)
VCR Block
2
(B)
1
1
Syscon PCB
1
Deck Chassis
Fig. 1-6
1-7: JACK PLATE AND SYSCON PCB (Refer to Fig. 1-7)
1.
Remove the screw 1.
2.
Remove the Syscon PCB in the direction of arrow (A).
3.
Remove the 2 screws 2.
4.
Unlock the 2 supports 3.
5.
Remove the Jack Plate in the direction of arrow (B).
Jack Plate
Shield Plate Bottom
3
2
1-6: DECK CHASSIS (Refer to Fig. 1-6)
1.
Remove the 3 screws 1.
2.
Disconnect the following connectors: (CP1004, CP1005, CP1006, CP4001, CP4004 and CP4005).
3.
Remove the Deck Chassis in the direction of arrow.
Fig. 1-5
Syscon PCB
2
3
(B)
1
(A)
Deck Holder
2
3
Fig. 1-7
B1-2
DISASSEMBLY INSTRUCTIONS
2. REMOVAL OF DECK PARTS
2-1: TOP BRACKET (Refer to Fig. 2-1)
Remove the 2 screws 1.
1. Slide the 2 supports 2 and remove the Top Bracket.
2.
NOTE
When you install the Top Bracket, install the screw (1) first, then install the screw (2).
(2)
1
Top Bracket
2
Main Chassis
• Screw Torque: 5 ± 0.5kgf•cm
Top Bracket
2
Main Chassis
2-2: FLAP LEVER/TAPE GUIDE R (Refer to Fig. 2-2)
Move the Cassette Holder Ass'y to the back side.
1. Remove the Polyslider Washer 1.
2. Remove the Flap Lever.
3. Unlock the 3 supports 2 and remove the Tape Guide R.
4.
(1)
1
Fig. 2-1
NOTE
When you install the Tape Guide L, install as shown in the circle of Fig. 2-3-B. (Refer to Fig. 2-3-B)
Tape Guide L
REC Lever
• The REC Lever is not installed on the Video Cassette Player.
Fig. 2-3-B
2-4: CASSETTE HOLDER ASS'Y (Refer to Fig. 2-4)
Move the Cassette Holder Ass'y to the front side.
1. Push the Locker R to remove the Cassette Side R.
2. Remove the Cassette Side L.
3.
Main Chassis
Cassette Side R
Locker R
Tape Guide R
Flap Lever
2
2
2
Main Chassis
1
Fig. 2-2
2-3: TAPE GUIDE L (Refer to Fig. 2-3-A)
Move the Cassette Holder Ass'y to the back side.
1. Unlock the 2 supports 1 and remove the Tape Guide L.
2. Remove the REC Lever. (Recorder only)
3.
REC Lever
Tape Guide L
1
1
• The REC Lever is not installed on the Video Cassette Player.
Main Chassis
Fig. 2-3-A
Cassette Side L
Main Chassis
Fig. 2-4
2-5: CASSETTE SIDE L/R (Refer to Fig. 2-5)
Unlock the 4 supports 1 and then remove the Cassette
1. Side L/R.
NOTE
When you install the Cassette Side R, be sure to move the Locker R after installing.
1
1
Locker R
Cassette Side R
1
1
Cassette Side L
Fig. 2-5
B2-1
DISASSEMBLY INSTRUCTIONS
2-6: LINK ASS'Y (Refer to Fig. 2-6)
Set the Link Ass'y to the Eject position.
1. Remove the (A) side of the Link Ass'y first, then remove
2. the (B) side.
Link Ass'y
(A)
Main Chassis
(B)
Link Ass'y
Main Chassis
Fig. 2-6
2-7: LOADING MOTOR ASS'Y (Refer to Fig. 2-7)
Remove the Link Lever.
1. Remove the Dumper Spring.
2. Remove the 2 screws 1.
3. Unlock the support 2 and remove the Loading Motor
4. Ass'y. Unlock the 2 supports 3 and remove the Deck PCB
5. (BOT).
1
Dumper Spring
Loading Motor Ass'y
2
2-9: TENSION ASS'Y (Refer to Fig. 2-9-A)
Move the Inclined S Ass'y to the back side.
1. Remove the Tension Spring.
2. Unlock the support 1 and remove the Tension Arm
3. Ass'y. Remove the Tension Adjust.
4. Unlock the 2 supports 2 and remove the Tension Band
5. Ass'y. Unlock the support 3 and remove the Tension Holder.
6. Remove the SS Brake Spring.
7. Remove the SS Arm Brake.
8.
Tension Adjust
2
Tension Spring
SS Brake Spring
SS Arm Brake
2
1
3
Tension Band Ass'y
Tension Arm Ass'y
Tension Holder
Inclined S Ass'y
Fig. 2-9-A
NOTE
When you install the Tension Adjust, install as shown in Fig. 2-9-B. (Refer to Fig. 2-9-B)
3
Main Chassis
• Screw Torque: 5 ± 0.5kgf•cm
1
Deck PCB (BOT)
2-8: SENSOR COVER L3 (Refer to Fig. 2-8)
Unlock the support 1 and remove the Sensor Cover L3.1.
Main Chassis
Sensor Cover L3
1
Link Lever
Fig. 2-7
Fig. 2-8
Adjust the direction of the Marker to inside.
2-10: T BRAKE ASS'Y (Refer to Fig. 2-10)
Remove the T Brake Spring.
1. Remove the T Brake Ass'y.
2.
T Brake Ass'y
T Brake Spring
Fig. 2-9-B
Fig. 2-10
B2-2
DISASSEMBLY INSTRUCTIONS
2-11: S REEL/T REEL (Refer to Fig. 2-11)
Remove the S Reel and T Reel.
1. Remove the 2 Polyslider Washers 1.
2.
NOTE
Take care not to damage the gears of the S Reel and T
1. Reel. The Polyslider Washer may be remained on the back of
2. the reel. Take care not to damage the shaft.
3. Do not touch the section "A" of S Reel and T Reel. (Use
4. gloves.) (Refer to Fig. 2-11) Do not adhere the stains on it. When you install the reel, clean the shaft and oil it (FL
5. OIL #6115). (If you do not oil, noise may be heard in FF/ REW mode.) After installing the reel, adjust the height of the reel.
6.
(Refer to MECHANICAL ADJUSTMENT)
S Reel
(A)
1
T Reel
(A)
1
NOTE
Do not touch the Pinch Roller. (Use gloves.)
1. When you install the Pinch Roller Block, install as shown
2. in the circle of Fig. 2-12-B. (Refer to Fig. 2-12-B)
Fig. 2-12-B
2-13: A/C HEAD (Refer to Fig. 2-13-A)
Remove the screw 1.
1. Remove the A/C Head Base.
2. Remove the 3 screws 2.
3. Remove the A/C Head and A/C Head Spring.
4.
NOTE
Do not touch the A/C Head. (Use gloves.)
1. When you install the A/C Head Spring, install as shown
2. in Fig. 2-13-B. (Refer to Fig. 2-13-B) When you install the A/C Head, tighten the screw (1)
3. first, then tighten the screw (2), finally tighten the screw (3).
2-12: PINCH ROLLER BLOCK/P5-3 ARM ASS'Y
(Refer to Fig. 2-12-A)
Remove the P5 Spring.
1. Remove the screw 1.
2. Unlock the 2 supports 2 and remove the Cassette
3. Opener. Remove the Pinch Roller Block, Pinch Roller Arm
4. Spring, Pinch Roller Lever Ass'y and P5-3 Arm Ass'y.
P5 Spring
P5-3 Arm Ass'y
1
2
Cassette Opener
2
Pinch Roller Block
Pinch Roller Arm Spring
Pinch Roller Lever Ass'y
Main Chassis
Fig. 2-11
(3)
(1)
2
2
2
(2)
1
• Screw Torque: 4 ± 0.5kgf•cm (Screw 1)
Spring Position
A/C Head
A/C Head Spring
A/C Head Base
Fig. 2-13-A
Fig. 2-13-B
2-14: FE HEAD (RECORDER ONLY) (Refer to Fig. 2-14)
Remove the screw 1.
1. Remove the FE Head.
2.
• Screw Torque: 5 ± 0.5kgf•cm
Fig. 2-12-A
B2-3
FE Head
• The FE Head is not installed on the Video Cassette Player.
• Screw Torque: 4 ± 0.5kgf•cm
1
Fig. 2-14
DISASSEMBLY INSTRUCTIONS
2-15: AHC ASS'Y/CYLINDER UNIT ASS'Y
(Refer to Fig. 2-15)
Unlock the support 1 and remove the AHC Ass'y.
1. Remove the 3 screws 2.
2. Remove the Cylinder Unit Ass'y.
3.
NOTE
When you install the Cylinder Unit Ass'y, tighten the screws from (1) to (3) in order while pulling the Ass'y toward the left front direction.
AHC Ass'y
Cylinder Unit Ass'y
2
(2)
• Screw Torque: 3 ± 0.5kgf•cm
(1)
2
2
(3)
1
Fig. 2-15
2-16: CAPSTAN DD UNIT (Refer to Fig. 2-16)
Remove the Capstan Belt.
1. Remove the 3 screws 1.
2. Remove the Capstan DD Unit.
3.
1
Middle Gear
E-Ring
Main Cam
Pinch Roller Cam
2
Joint Gear
P5 Cam
Fig. 2-17-A
NOTE
When you install the Pinch Roller Cam, P5 Cam and Main Cam, align each marker. (Refer to Fig. 2-17-B)
Pinch Roller Cam
Check the hole of Main Chassis can be seen.
Marker
Main Cam
P5 Cam
Capstan Belt
Capstan DD Unit
1
1
1
• Screw Torque: 5 ± 0.5kgf•cm
Fig. 2-16
2-17: MIDDLE GEAR/MAIN CAM (Refer to Fig. 2-17-A)
Remove the Polyslider Washer 1, then remove the
1. Middle Gear. Remove the E-Ring, then remove the Main Cam, P5
2. Cam and Pinch Roller Cam. Remove the Polyslider Washer 2, then remove the
3. Joint Gear.
Fig. 2-17-B
2-18: CLUTCH ASS'Y (Refer to Fig. 2-18)
Remove the Polyslider Washer 1.
1. Remove the Clutch Ass'y, Ring Spring and Coupling
2. Gear. Unlock the 2 supports 2 and remove the Clutch Lever.
3.
1
Clutch Ass'y
Ring Spring
Coupling Gear
Clutch Lever
2
2
Fig. 2-18
B2-4
DISASSEMBLY INSTRUCTIONS
2-19: LOADING GEAR S/T ASS'Y (Refer to Fig. 2-19-A)
Remove the E-Ring 1 and remove the Main Loading
1. Gear. Remove the Capstan Brake Spring.
2. Slide the Main Rod and remove the Capstan Brake
3. Ass'y. Remove the Main Rod, Tension Lever, Clutch Actuator,
4. Idler Arm Ass'y. Remove the screw 2.
5. Remove the LED Reflecter.
6. Remove the Loading Arm S Ass'y and Loading Arm T
7. Ass'y.
8.
Remove the Loading Gear S and Loading Gear T.
9.
Remove the Loading Gear Spring.
Capstan Brake Spring
Main Rod
Idler Arm Ass'y
LED Reflecter
Clutch Actuator
Capstan Brake Ass'y
2
1
Main Loading Gear
Tension Lever
Loading Gear T
Loading Gear Spring
Loading Arm T Ass'y
Loading Gear S
Loading Gear Spring
2. When you install the Clutch Actuator, install as shown in the circle of Fig. 2-19-C. (Refer to Fig. 2-19-C)
Clutch Actuator
Fig. 2-19-C
2-20: INCLINED S/T ASS'Y (Refer to Fig. 2-20)
Unlock the support 1 and remove the P4 Cover.
1. Remove the screw 2.
2. Unlock the support 3 and remove the Loading Gear
3. Holder. Remove the Inclined S.
4. Remove the Inclined T.
5. Remove the 2 screws 4, then remove the Guide Roller.
6.
NOTE
Do not touch the roller of Guide Roller.
2
Loading Gear Holder
Guide Roller
3
Loading Arm S Ass'y
• Screw Torque: 5 ± 0.5kgf•cm
Fig. 2-19-A
NOTES
1. When you install the Loading Arm S Ass'y, Loading Arm T Ass'y and Main Loading Gear, align each marker.
(Refer to Fig. 2-19-B)
Marker
Main Loading Gear
Marker
Loading Arm T Ass'y
Loading Arm S Ass'y
4
Inclined S
• Screw Torque: 5 ± 0.2kgf•cm (Screw 2)
• Screw Torque: 0.7 ± 0.2kgf•cm (Screw 4)
Guide Roller
4
Inclined T
P4 Cover
1
Fig. 2-20
Fig. 2-19-B
B2-5
DISASSEMBLY INSTRUCTIONS
3. REMOVAL OF ANODE CAP
Read the following NOTED items before starting work. *
After turning the power off there might still be a potential voltage that is very dangerous. When removing the Anode Cap, make sure to discharge the Anode Cap's potential voltage.
*
Do not use pliers to loosen or tighten the Anode Cap terminal, this may cause the spring to be damaged.
REMOVAL
1. Follow the steps as follows to discharge the Anode Cap.
(Refer to Fig. 3-1.)
Connect one end of an Alligator Clip to the metal part of a flat-blade screwdriver and the other end to ground. While holding the plastic part of the insulated Screwdriver, touch the support of the Anode with the tip of the Screwdriver. A cracking noise will be heard as the voltage is discharged.
GND on the CRT
3. After one side is removed, pull in the opposite direction to remove the other.
NOTE
Take care not to damage the Rubber Cap.
INSTALLATION
1. Clean the spot where the cap was located with a small amount of alcohol. (Refer to Fig. 3-3.)
Location of Anode Cap
Fig. 3-3
NOTE
Confirm that there is no dirt, dust, etc. at the spot where the cap was located.
2.3.Arrange the wire of the Anode Cap and make sure the wire is not twisted. Turn over the Rubber Cap. (Refer to Fig. 3-4.)
Screwdriver
Alligator Clip
GND on the CRT
Flip up the sides of the Rubber Cap in the direction of the
2. arrow and remove one side of the support.
(Refer to Fig. 3-2.)
Rubber Cap
CRT
Support
Support
CRT
Fig. 3-1
Fig. 3-2
Fig. 3-4
4. Insert one end of the Anode Support into the anode button, then the other as shown in Fig. 3-5.
Support
CRT
5.6.Confirm that the Support is securely connected. Put on the Rubber Cap without moving any parts.
Fig. 3-5
B3-1
A
A/C ACC AE AFC AFT AFT DET AGC AMP ANT A.PB APC ASS'Y AT AUTO A/V
B
BGP BOT BPF BRAKE SOL BUFF B/W
C
C CASE CAP CARR CH CLK CLOCK (SY-SE) COMB CONV CPM CTL CYL CYL-M CYL SENS
D
DATA (SY-CE) dB DC DD Unit DEMOD DET DEV
E
E EF EMPH ENC ENV EOT EQ EXT
F
F FBC FE FF FG FL SW FM FSC FWD
G
GEN GND
H
H.P.F
KEY TO ABBREVIATIONS
:
Audio/Control
:
Automatic Color Control
:
Audio Erase
:
Automatic Frequency Control
:
Automatic Fine Tuning
:
Automatic Fine Tuning Detect
:
Automatic Gain Control
:
Amplifier
:
Antenna
:
Audio Playback
:
Automatic Phase Control
:
Assembly
:
All Time
:
Automatic
:
Audio/Video
:
Burst Gate Pulse
:
Beginning of Tape
:
Bandpass Filter
:
Brake Solenoid
:
Buffer
:
Black and White
:
Capacitance, Collector
:
Cassette
:
Capstan
:
Carrier
:
Channel
:
Clock
:
Clock (Syscon to Servo)
:
Combination, Comb Filter
:
Converter
:
Capstan Motor
:
Control
:
Cylinder
:
Cylinder-Motor
:
Cylinder-Sensor
:
Data (Syscon to Servo)
:
Decibel
:
Direct Current
:
Direct Drive Motor Unit
:
Demodulator
:
Detector
:
Deviation
:
Emitter
:
Emitter Follower
:
Emphasis
:
Encoder
:
Envelope
:
End of Tape
:
Equalizer
:
External
:
Fuse
:
Feed Back Clamp
:
Full Erase
:
Fast Forward, Flipflop
:
Frequency Generator
:
Front Loading Switch
:
Frequency Modulation
:
Frequency Sub Carrier
:
Forward
:
Generator
:
Ground
:
High Pass Filter
H.SW Hz
I
IC IF IND INV
K
KIL
L
L LED LIMIT AMP LM, LDM LP L.P.F LUMI.
M
M MAX MINI MIX MM MOD MPX MS SW
N
NC NR
O
OSC OPE
P
PB PB CTL PB-C PB-Y PCB P. CON PD PG P-P
R
R REC REC-C REC-Y REEL BRK REEL S REF REG REW REV, RVS RF RMC RY
S
S. CLK S. COM S. DATA SEG SEL SENS SER SI SIF SO SOL SP STB SW
:
Head Switch
:
Hertz
:
Integrated Circuit
:
Intermediate Frequency
:
Indicator
:
Inverter
:
Killer
:
Left
:
Light Emitting Diode
:
Limiter Amplifier
:
Loading Motor
:
Long Play
:
Low Pass Filter
:
Luminance
:
Motor
:
Maximum
:
Minimum
:
Mixer, mixing
:
Monostable Multivibrator
:
Modulator, Modulation
:
Multiplexer, Multiplex
:
Mecha State Switch
:
Non Connection
:
Noise Reduction
:
Oscillator
:
Operation
:
Playback
:
Playback Control
:
Playback-Chrominance
:
Playback-Luminance
:
Printed Circuit Board
:
Power Control
:
Phase Detector
:
Pulse Generator
:
Peak-to Peak
:
Right
:
Recording
:
Recording-Chrominance
:
Recording-Luminance
:
Reel Brake
:
Reel Sensor
:
Reference
:
Regulated, Regulator
:
Rewind
:
Reverse
:
Radio Frequency
:
Remote Control
:
Relay
:
Serial Clock
:
Sensor Common
:
Serial Data
:
Segment
:
Select, Selector
:
Sensor
:
Search Mode
:
Serial Input
:
Sound Intermediate Frequency
:
Serial Output
:
Solenoid
:
Standard Play
:
Serial Strobe
:
Switch
C1-1
S
SYNC SYNC SEP
T
TR TRAC TRICK PB TP
U
UNREG
V
V VCO VIF VP V.PB VR V.REC VSF VSR VSS V-SYNC VT
X
X'TAL
Y
Y/C
KEY TO ABBREVIATIONS
:
Synchronization
:
Sync Separator, Separation
:
Transistor
:
Tracking
:
Trick Playback
:
Test Point
:
Unregulated
:
Volt
:
Voltage Controlled Oscillator
:
Video Intermediate Frequency
:
Vertical Pulse, Voltage Display
:
Video Playback
:
Variable Resistor
:
Video Recording
:
Visual Search Fast Forward
:
Visual Search Rewind
:
Voltage Super Source
:
Vertical-Synchronization
:
Voltage Tuning
:
Crystal
:
Luminance/Chrominance
C1-2
SERVICE MODE LIST
This unit provided with the following SERVICE MODES so you can repair, examine and adjust easily. To enter SERVICE MODE, Unplug AC cord till lost actual clock time. Then press and hold Vol (-) button of main unit and
remocon key for more than 2 seconds. The both pressing of set key and remote control key will not be possible if clock has been set. To reset clock, either unplug
AC cord and allow at least 30 minutes before Power On or alternatively, discharge backup capacitor.
Set Key Remocon Key Operations
VOL. (-) MIN 1
VOL. (-) MIN 2
VOL. (-) MIN
VOL. (-) MIN 4
VOL. (-) MIN 5
VOL. (-) MIN 6
VOL. (-) MIN 8
Initialization of the factory. NOTE: Do not use this for the normal servicing.
Horizontal position adjustment of OSD. NOTE: Also can be adjusted by using the Adjustment MENU. Refer to the "ELECTRICAL ADJUSTMENT" (OSD HORIZONTAL).
3
Adjust the PG SHIFTER automatically. Refer to the "ELECTRICAL ADJUSTMENT" (PG SHIFTER).
Adjust the PG SHIFTER manually. Refer to the "ELECTRICAL ADJUSTMENT" (PG SHIFTER).
Adjusting of the Tracking to the center position. NOTE: Also can be adjusted by pressing the ATR button for more tan 2 seconds during PLAY.
POWER ON total hours and PLAY/REC total hours are displayed on the screen. Refer to the "PREVENTIVE CHECKS AND SERVICE INTERVALS" (CONFIRMATION OF USING HOURS).
Can be checked of the INITIAL DATA of MEMORY IC. Refer to the "NOTE FOR THE REPLACING OF MEMORY IC".
Writing of EEPROM initial data. NOTE: Do not use this for the normal servicing.
VOL. (-) MIN 9
Method Operations
Press the ATR button on the remote control for more than 2 seconds during PLAY.
Make the short circuit between the test point of SERVICE and the GND.
Display of the Adjustment MENU on the screen. Refer to the "ELECTRICAL ADJUSTMENT" (On-Screen Display Adjustment).
Adjusting of the Tracking to the center position. Refer to the "MECHANICAL ADJUSTMENT" (GUIDE ROLLER) and "ELECTRICAL ADJUSTMENT" (PG SHIFTER).
The EOT/BOT/Reel sensor do not work at this moment. Refer to the "PREPARATION FOR SERVICING"
C2-1
PREVENTIVE CHECKS AND SERVICE INTERVALS
The following standard table depends on environmental conditions and usage. Unless maintenance is properly carried out, the following service intervals may be quite shortened as harmful effects may be had on other parts. Also, long term storage or misuse may cause transformation and aging of rubber parts.
Time
Parts Name
Audio Control Head
Full Erase Head
(Recorder only)
Capstan Belt
Pinch Roller
Capstan DD Unit
Loading Motor
Tension Band Capstan Shaft
Tape Running Guide Post
Cylinder Unit
: Clean : Replace
500
hours
1,000 hours
1,500 hours
2,000 hours
3,000 hours
Notes
Clean those parts in contact with the tape.
Clean the rubber, and parts which the rubber touches.
Replace when rolling becomes abnormal.
Clean the Head
CONFIRMATION OF USING HOURS
POWER ON total hours and PLAY/REC total hours can be checked on the screen. Total hours are displayed in 16 system of notation.
NOTE: The confirmation of using hours will not be possible if clock has been set. To reset clock, either unplug
AC cord and allow at least 30 minutes before Power On or alternatively, discharge backup capacitor.
1.
Set the VOLUME to minimum.
2.
While holding down VOLUME button on front cabinet, press key 6 on remote control for more than 2 seconds.
3.
After the confirmation of using hours, turn off the power.
INIT 00 83 POWER ON
PLAY/REC
(16 x 16 x 16 x thousands digit value) + (16 x 16 x hundreds digit value) + (16 x tens digit value) + (ones digit value)
0010 0003
Initial setting content of MEMORY IC.
POWER ON total hours. PLAY/REC total hours.
C3-1
PREVENTIVE CHECKS AND SERVICE INTERVALS
CLEANING
NOTE
After cleaning the heads with isopropyl alcohol, do not run a tape until the heads dry completely. If the heads are not completely dry and alcohol gets on the tape, damage may occur.
1. AUDIO CONTROL HEAD
Wrap a piece of chamois around your finger. Dip it in isopropyl alcohol and clean the audio control head by wiping it horizontally. Clean the full erase head in the same manner. (Refer to the figure below.)
2. TAPE RUNNING SYSTEM
When cleaning the tape transport system, use the gauze moistened with isopropyl alcohol.
3. CYLINDER
Wrap a piece of chamois around your finger. Dip it in isopropyl alcohol. Hold it to the cylinder head softly. Turn the cylinder head counterclockwise to clean it (in the direction of the arrow). (Refer to the figure below.)
NOTE
Do not exert force against the cylinder head. Do not move the chamois upward or downward on the head. Use the chamois one by one.
Audio Control Head
Cylinder Head
C3-2
NOTE FOR THE REPLACING OF MEMORY IC
If a service repair is undertaken where it has been required to change the MEMORY IC, the following steps should be taken to ensure correct data settings while making reference to TABLE 1.
NOTE: Initial Data setting will not be possible if clock has been set. To reset clock, either unplug AC cord and allow
at least 30 minutes before Power On or alternatively, discharge backup capacitor.
+0 +1 +2 +3 +4 +5 +6 +7 +8 +9 5C 1E 07 81 EA 80 15 07 C4 81
05
A6 63 65 66 41 1E 3B 2A 17
10 20 59 5F 05 F0 00 F0
77 63 64 65 64 0A 40 F5 76 A0
30 15 28 A0 C4 20 08
5F 05 F0 05 F3 EF 90 6C 38 21
40 10 3A 60 47 03 06 15
BF 1B B5 C3 43 7D 8B 8B 0C
22
20 24 26 28 2A 2C 2E 30 32
50
40 42 44 46 49 4C 4F 52 55 58
60 5B 5E 61 64 67 6A 70 8B 8E 91 94 97 9A
6D 70 73 76 79 7C 7F 82 85 88
80 A0 CD D2 D9 E1 F0 FF
9D
Enter DATA SET mode by setting VOLUME to minimum.
1. While holding down VOLUME button on front cabinet, press key 6 on remote control for more than 2 seconds.
2. ADDRESS and DATA should appear as FIG 1.
A5 AA AF B4 B9 BE C3 C8
Table 1
ADDRESS DATA
+A
+B +C +D +E +FINI 1A F1 67 6F 18 4100 1D 1B 3A 0F 4B 20
34 36 38 3A 3C 3E
INIT 00 83 POWER ON
PLAY/REC
0010 0003
Fig. 1
3.
ADDRESS is now selected and should "blink". Using the PLAY or STOP button on the remote, step through the ADDRESS until required ADDRESS to be changed is reached.
4.
Press ENTER to select DATA. When DATA is selected, it will "blink".
5.
Again, step through the DATA using PLAY or STOP button until required DATA value has been selected.
6.
Pressing ENTER will take you back to ADDRESS for further selection if necessary.
7.
Repeat steps 3 to 6 until all data has been checked.
8.
When satisfied correct DATA has been entered, turn POWER off (return to STANDBY MODE) to finish DATA input.
The unit will now have the correct DATA for the new MEMORY IC.
C4-1
SERVICING FIXTURES AND TOOLS
(For 2 head 1 speed model, 4 head model)
VHS Alignment Tape JG001E JG001F JG001U
(TTV-P2) (TTV-P1L) (VP S-X6 )
1
3
Screwdriver
JG154 Cable Parts No. SJ-G15-400-000
(For 2 head 2 speed model)
VHS Alignment Tape JG001C JG001D JG001V
JG162A Cable (8 Pins) Parts No. SJ-G16-2A0-000 JG162G Cable (14 Pins) Parts No. SJ-G16-2G0-000 JG162Y Cable (5 Pins) Parts No. SJ-G16-2Y0-000
(TTV-P2) (TTV-P1L)
2
(VP S-X6 )
3
JG002B JG002E
Adapter Dial Torque Gauge (10~90gf•cm)
JG002F
JG024AJG022 Master PlaneJG153 X Value Adjustment
(60~600gf•cm)
Reel Disk Height Adjustment Jig
Tentelometer
JG005 Post Adjustment
Screwdriver Part No. SV-TG0-030-000 (small)
JG100A Torque Tape
(VHT-063)
Part No. Remarks
JG001E Stair Steps, 7KHz (For 2 head 1 speed model, 4 head model)
JG001F Color Bar, 1KHz (For 2 head 1 speed model, 4 head model) JG001U X Value Adjustment (For 2 head 1 speed model, 4 head model) JG001C Stair Steps, 7KHz (For 2 head 2 speed model)
JG001D Color Bar, 1KHz (For 2 head 2 speed model)
JG001V
X Value Adjustment (For 2 head 2 speed model) JG002B VSR Torque, Brake Torque (S Reel/T Reel Ass'y) JG002E Brake Torque (T Reel Ass'y) JG002F
JG005 JG153
JG022/JG024A
VSR Torque, Brake Torque (S Reel)
Guide Roller Adjustment
X Value Adjustment
Reel Disk Height Adjustment JG100A Playback Torque, Back Tension Torque During Playback
JG154
Used to connect the test point of SERVICE and GROUND JG162A Used to connect the Sub Power PCB and Main PCB
Used to connect the Syscon PCB and Main PCBJG162G
Used to connect the Syscon PCB and CRT PCBJG162Y
C5-1
PREPARA TION FOR SER VICING
How to use the Servicing Fixture
1.
Unplug the connector CP353, CP755 and CP4202 then remove the TV/VCR Block from the set.
2.
Unplug the connector CP810, CP820 and CP805, then remove the Main PCB from the VCR Block.
3.
Connect as shown in the below figure using the Service Fixture.
• Connect the Sub Power PCB and Main PCB with the cable JG162A.
• Connect the Syscon PCB to the Main PCB with the cable JG162G.
• Connect the Syscon PCB to the CRT PCB with the cable JG162Y.
4.
Remove the Operation PCB from the set, then connect it with the Syscon PCB. If necessary, connect CD702. (Front A/V Jack Input Terminal)
5.
Short circuit between TP1001 and Ground with the cable JG154.
(Refer to MAJOR COMPONENTS LOCATION GUIDE)
The EOT, BOT and Reel Sensor do not work at this moment.
6.
At that time, the STOP/EJECT button is available to insert and eject the Cassette Tape.
Front Cabinet
To Ground
Syscon PCB
TP1001
JG154
CRT PCB
CP805
CD850
Operation PCB
Main PCB
JG162Y
CP755
CD757
CP820
CP810
JG162G
JG162A
CD820
CD9001
CD702
C5-2
PREPARA TION FOR SER VICING
Servicing Position for Main PCB (In case of needing to check on Main PCB)
• It's possible to get the Servicing Position without the extension Jig if you arrange the unit as shown below. (But L503 connection can not be done, Degauss circuit will not operate.)
L503 (2 Pin)
• Be careful for the short circuit.
Main PCB
VHS Tape (Put the Tape under the FBT.)
C5-3
VCR TEST TAPE INTERCHANGEABILITY TABLE
There are two types of the new alignment tape CH-1B (for NTSC) and CH-2 (for PAL). On each tape four signals (1) - (4) are recorded for the times and in the order shown below.
(1) : 8min. ---> (2) : 2min. ---> (3) : 5min. ---> (4) : 5min.
The TTV-MP1 (for M-PAL), TTV-MS1 (for MESECAM) and TTV-S1 (for SECAM) alignment tapes have the same contents as the previous tapes.
Method
NTSC
Now in use TYPE
Model Model Contents*1
TTV-N1
TTV-N1E
TTV-N2
TTV-N12
(SCV-1998)
TTV-N7A
Contents*1
NTSC, Color, 1kHz, SP
NTSC, Color, 1kHz, EP
NTSC, Stairsteps, 7kHz, SP
NTSC, Color, 1kHz, SP
NTSC, Stairsteps, 1kHz, SP, HiFi 400Hz
CH-1B(2)
CH-1B(4)
CH-1B(1)
CH-1B(4)
CH-1B(3)
New TYPE
NTSC, Stairsteps, 1kHz, SP
NTSC, Color,
*2
1kHz, EP
NTSC, Stairsteps, 7kHz, SP
NTSC, Color, No sound SP, HiFi 400Hz
NTSC, Color, 1kHz, EP
Application
PB-Y Level/General electrical ADJ. Head ACE Height/Tilt ADJ.
Switching position ADJ.
Head ACE Azimuth ADJ.
FM envelope ADJ. X-Value ADJ.
HiFi Audio PB Level ADJ.
TTV-P1
TTV-P1L
PAL
TTV-P2
TTV-P7
TTV-P16
*1. Described in the order of color format. Video signal. Linear audio. Tape speed and Hi-Fi audio. *2. Use CH-1B (1) - (3) with models used exclusively in the SP mode. *3. Use CH-2 (3) and (4) when it is necessary to observe the chroma signal.
PAL, Color, 1kHz, SP
PAL, Color, 1kHz, LP
PAL, Stairsteps, 6kHz, SP
PAL, Stairsteps, 1kHZ, SP, HiFi, 1kHz
PAL, Color, 400Hz, SP, HiFi 1kHz
CH-2(2)
*3
CH-2(4)
CH-2(1)
CH-2(3)
PAL, Stairsteps, 1kHz, SP
PAL, Color, 1kHz, LP
PAL, Stairsteps, 6kHz, SP
PAL, Color, No sound SP, HiFi 400Hz
No Changed.
Switching position ADJ. PB-Y Level/General electrical ADJ. Head ACE Height/Tilt ADJ.
Switching position. (LP Model) FM Envelope ADJ. (LP Model) X-Value ADJ. (LP Model)
Head ACE Azimuth ADJ. FM Envelope ADJ. (SP Model) X-Value ADJ. (SP Model)
HiFi Audio PB Level ADJ.
FM Filter ADJ.
C6-1
MECHANICAL ADJUSTMENTS
1. CONFIRMATION AND ADJUSTMENT
Read the following NOTES before starting work.
••Place an object which weighs between 450g~500g on
the Cassette Tape to keep it steady when you want to make the tape run without the Cassette Holder. (Do not place an object which weighs over 500g.) When you activate the deck without the Cassette Holder, short circuit between TP1001 and GND. (Refer to
ELECTRICAL ADJUSTMENT PARTS LOCATION GUIDE) In this condition the BOT/EOT/Reel Sensor will
not function.
CONFIRMATION AND ADJUSTMENT OF REEL
1-1:
DISK HEIGHT
1.
Turn on the power and set to the STOP mode.
2.
Set the master plane (JG022) and reel disk height adjustment jig (JG024A) on the mechanism framework, taking care not to scratch the drum, as shown in Fig. 1- 1-A.
3.
Confirm that "A" of the reel disk is lower than "B" of the reel disk height adjustment jig (JG024A), and is higher than "C". If it is not enough height, adjust to 10(+0.2, -0) mm with the height adjustment washer.
4.
Adjust the other reel in the same way.
Master Plane (JG022)
1-2: CONFIRMATION AND ADJUSTMENT OF TENSION
POST POSITION
1.
Set to the PLAY mode.
2.
Adjust the Tension Adjust until the edge of the Tension Arm is positioning within 0.5mm range from the standard line center of Main Chassis. After this adjustment, confirm that the cut position is located in "A" area as shown in Fig. 1-2-B. If it is located in "B" area, adjust again.
3.
While turning the S Reel clockwise, confirm that the edge of the Tension Arm is located in the position described above.
Standard line of Main Chassis
Tension Arm
0.5mm (Adjusting range)
Standard line center of Main Chassis
Tension Adjust
Fig. 1-2-A
Master Plane (JG022)
10(+0.2, -0)mm
Reel Disk Height Adjustment Jig (JG024A)
Reel Disk
Height Adjustment Washer
2.6x4.7xT0.13
2.6X4.7xT0.25
Reel Disk Height Adjustment Jig (JG024A)
(B)
(A)
Fig. 1-1-A
(C)
Fig. 1-1-B
(A)
Cut Position
(B)
Tension Adjust
Fig. 1-2-B
1-3: CONFIRMATION OF PLAYBACK TORQUE AND
BACK TENSION TORQUE DURING PLAYBACK
Load a video tape (E-180) recorded in standard speed
1. mode. Set the unit to the PLAY mode. Install the tentelometer as shown in Fig. 1-3. Confirm that
2. the meter indicates 20 ± 2gf in the beginning of playback.
• USING A CASSETTE TYPE TORQUE TAPE (JG100A)
1.
After confirmation and adjustment of Tension Post position (Refer to item 1-2), load the cassette type torque tape (JG100A) and set to the PLAY mode.
2.
Confirm that the right meter of the torque tape indicates 60~110gf•cm during playback in SP mode.
3.
Confirm that the left meter of the torque tape indicates 25~40gf•cm during playback in SP mode.
Tentelometer
Video Tape
D1-1
P1 Post
Guide Roller
Fig. 1-3
MECHANICAL ADJUSTMENTS
1-4: CONFIRMATION OF VSR TORQUE
Operate within 4~5 seconds after the reel disk begins to
1. turn. Install the Torque Gauge (JG002F) and Adapter (JG002B)
2. on the S Reel. Set to the Rewind mode. (Refer to Fig.1-4) Then, confirm that it indicates 120~180gf•cm.
3.
NOTE
Install the Torque Gauge on the reel disk firmly. Press the REW button to turn the reel disk.
1-5: CONFIRMATION OF REEL BRAKE TORQUE
(S Reel Brake) (Refer to Fig. 1-4)
Set to the STOP mode.
1. Move the Idler Ass'y from the S Reel.
2. Install the Torque Gauge (JG002F) and Adapter
3.
(JG002B) on the S Reel. Turn the Torque Gauge (JG002F) clockwise.
Then, confirm that it indicates 60~100gf•cm.
4.
(T Reel Brake) (Refer to Fig. 1-4)
Set to the STOP mode.
1. Move the Idler Ass'y from the T Reel.
2. Install the Torque Gauge (JG002E) and Adapter
3.
(JG002B) on the T reel. Turn the Torque Gauge (JG002E) counterclockwise.
Then, confirm that it indicates 45~70gf•cm.
4.
Torque Gauge/Adapter (JG002F/JG002B)
2. CONFIRMATION AND ADJUSTMENT OF TAPE RUNNING MECHANISM
Tape Running Mechanism is adjusted precisely at the factory. Adjustment is not necessary as usual. When you replace the parts of the tape running mechanism because of long term usage or failure, the confirmation and adjustment are necessary.
2-1: GUIDE ROLLER
Playback the VHS Alignment Tape (JG001C or JG001E).
1.
(Refer to SERVICING FIXTURE AND TOOLS)
Connect CH-1 of the oscilloscope to TP4002 (Envelope)
2.
and CH-2 to TP4001 (SW Pulse). Press and hold the Tracking-Auto button on the remote
3.
control more than 2 seconds to set tracking to center. Trigger with SW Pulse and observe the envelope. (Refer
4.
to Fig. 2-1-A)
When observing the envelope, adjust the Adjusting Driver
5.
(JG005) slightly until the envelope will be flat. Even if you press the Tracking Button, adjust so that flatness is not moved so much. Adjust so that the A : B ratio is better than 3 : 2 as shown
6.
in Fig. 2-1-B, even if you press the Tracking Button to move the envelope (The envelope waveform will begin to decrease when you press the Tracking Button). Adjust the PG shifter during playback.
7.
(Refer to the ELECTRICAL ADJUSTMENTS)
NOTE
After adjustment, confirm and adjust A/C head.
(Refer to item 2-2)
Torque Gauge/Adapter (JG002E/JG002B)
S Reel
T Reel
Fig. 1-4
NOTE
If the torque is out of the range, replace the following parts.
Check item
1-4 1-5
Replacement Part
Idler Ass'y/Clutch Ass'y
T Brake Spring/Tension Spring
Envelope
CH-3 Audio
Max
CH-1 Envelope (TP4002)
CH-1
CH-2
Track
Track
CH-2 SW Pulse (TP4001)
(1)
(2)
Entrance Exit
A
B
Fig. 2-1-A
Max
D1-2
A : B ≥ 3 : 2
Fig. 2-1-B
MECHANICAL ADJUSTMENTS
CONFIRMATION AND ADJUSTMENT OF AUDIO/ CONTROL HEAD
When the Tape Running Mechanism does not work well, adjust the following items.
1.
Playback the VHS Alignment Tape (JG001C or JG001E).
(Refer to SERVICING FIXTURE AND TOOLS)
2.
Confirm that the reflected picture of stamp mark is appeared on the tape prior to P4 Post as shown in Fig. 2- 2-A. a)
When the reflected picture is distorted, turn the screw 1 clockwise until the distortion is disappeared.
b)
When the reflected picture is not distorted, turn the screw 1 counterclockwise until little distortion is appeared, then adjust the a).
3.
Turn the screw 2 to set the audio level to maximum.
4.
Confirm that the bottom of the Audio/ Control Head and the bottom of the tape is shown in Fig. 2-2-C. c)
When the height is not correct, turn the screw 3 to adjust the height. Then, adjust the 1~3 again.
Audio/Control Head
Reflected picture of Stamp Mark
P4 Post
2-3:2-2:
TAPE RUNNING ADJUSTMENT (X VALUE ADJUSTMENT)
Confirm and adjust the height of the Reel Disk.
1.
(Refer to item 1-1)
Confirm and adjust the position of the Tension Post.
2.
(Refer to item 1-2)
Adjust the Guide Roller. (Refer to item 2-1)
3.
Confirm and adjust the Audio/Control Head.
4.
(Refer to item 2-2)
Connect CH-1 of the oscilloscope to TP4002, CH-2 to
5.
TP4001 and CH-3 to HOT side of Audio Out Jack. Playback the VHS Alignment Tape (JG001U or JG001V).
6.
(Refer to SERVICING FIXTURE AND TOOLS)
Press and hold the Tracking-Auto button on the remote
7.
control more than 2 seconds to set tracking to center. Set the X Value adjustment driver (JG153) to the 4 of
8.
Fig. 2-2-B. Adjust X value so that the envelope waveform output becomes maximum. Check if the relation between Audio and Envelope waveform becomes (1) or (2) of Fig. 2-1-A.
Audio/Control Head
3
2
Audio/Control Head
Tape
Stamp Mark
Fig. 2-2-A
1
4
Fig. 2-2-B
0.25±0.05mm
Fig. 2-2-C
D1-3
MECHANICAL ADJUSTMENTS
3. MECHANISM ADJUSTMENT PARTS LOCATION GUIDE
4
3
2
5
6
7
1
10
1. Tension Adjust
2. Tension Arm
3. Guide Roller
4. P1 Post
5. Audio/Control Head
6.
X value adjustment driver hole
7.
P4 Post
8.
T Brake Spring
9.
T Reel
10.
S Reel
9
8
D1-4
ELECTRICAL ADJUSTMENTS
1. ADJUSTMENT PROCEDURE
Read and perform these adjustments when repairing the circuits or replacing electrical parts or PCB assemblies.
CAUTION
When replacing IC's or transistors, use only specified silicon grease (G746). (To prevent the damage to IC's and transistors.)
On-Screen Display Adjustment
1.2.Unplug the AC plug for more than 30 minutes to set the clock to the non-setting state. (To release the Back-Up immediately, take the short circuit between C1003 and GND at the Power Off.) Then, set the volume level to minimum. Press the VOL. DOWN button on the set and the channel button (9) on the remote control for more than 2 seconds to display adjustment mode on the screen as shown in Fig. 1-1.
NOTE
Use the channel buttons (1-8) on the remote control to select the options shown in Fig. 1-1. Press the channel button (0) or MENU button on the remote control to end the adjustments.
1. H/V
2. AKB
3. COLOR TEMP
4. PICTURE
5. OTHERS
6. TEST PATTERN
7.
8. 0. END
"The adjustment item 3 is not used for this model."
Fig. 1-1
2. BASIC ADJUSTMENTS
(VCR SECTION)
2-1: PG SHIFTER
1.
Connect CH-1 on the oscilloscope to TP4001 and CH-2 to TP4501.
2.
Playback the alignment tape. (JG001D)
3.
Press and hold the Tracking-Auto button on the remote control more than 2 seconds to set tracking to center.
4.
Press the VOL. DOWN button on the set and the channel button (3) on the remote control simultaneously until the indicator REC disappears. If the indicator REC disappears, adjustment is completed.
(If the above adjustments doesn't work well:)
5.
Press the VOL. DOWN button on the set and the channel button (3) on the remote control simultaneously until the indicator REC disappears.
6.
When the REC indicator is blinking, press both VOL. DOWN button on the set and the channel button (4) on the remote control simultaneously and adjust the Tracking +/- button until the arising to the down of Head Switching Pulse becomes 6.5 ± 0.5H.
(Refer to Fig. 2-1-A, B)
7.
Stop the alignment tape.
CH-2
6.5H
CH-1
Fig. 2-1-A
CH-2
CH-1
6.5H
Fig. 2-1-B
2-2: VCO
(REC TUNER)
1.
Place the set with Aging Test for more than 10 minutes.
2.
Connect the oscillator (39.5MHz) to TP1002.
3.
Connect the digital voltmeter between the pin 8 of CP603 and the pin 1 (GND) of CP603.
4.
Adjust the L6006 until the digital voltmeter is 2.4 ± 0.1V.
(MONITOR TUNER)
1.
Connect the oscillator (39.5MHz) to TUNER IF PIN.
2.
Connect the digital voltmeter between the pin 47 of IC601 and the GND.
3.
Adjust the L608 until the digital voltmeter is 3.8 ± 0.1V.
2-3: RF AGC DELAY
(MONITOR TUNER)
1.
Receive the UHF (80dB).
2.
Connect the digital voltmeter between the pin 5 of CP603 and the pin 1 (GND) of CP603.
3.
Activate the adjustment mode display of Fig. 1-1 and press the channel button (5) on the remote control to select "OTHERS". The Fig. 2-2 appears on the display.
4.
Press the channel button (1) on the remote control to select "RF AGC DELAY".
5.
Press the PLAY or STOP button on the remote control until the digital voltmeter is 1.7 ± 0.1V.
(REC TUNER)
Receive the UHF (80dB).
1. Connect the digital voltmeter between the pin 7 of
2. CP603 and the pin 1 (GND) of CP603. Activate the adjustment mode display of Fig. 1-1 and
3. press the channel button (5) on the remote control to select "OTHERS". The Fig. 2-2 appears on the display. Press the channel button (7) on the remote control to
4. select "REC AGC DELAY". Press the PLAY or STOP button on the remote control
5. until the digital voltmeter is 1.7 ± 0.1V.
D2-1
ELECTRICAL ADJUSTMENTS
1. RF AGC DELAY
2. VIDEO LEVEL
3. FM LEVEL
4. OSD H
5. CUT OFF
6. (VOL TEST)
7. REC AGC DELAY
8. 0. RETURN
"The adjustment items 6 and 8 is not used for this model."
2-4: 21 PIN AUDIO OUT
Receive the color bar pattern.
1. Connect the AC voltmeter to pin3 of J4501.
2. Activate the adjustment mode display of Fig. 1-1 and
3. press the channel button (5) on the remote control to select "OTHERS". The Fig. 2-2 appears on the display. Press the channel button (3) on the remote control to
4. select "FM LEVEL". Press the PLAY or STOP button on the remote control
5. until the AC voltmeter is 550 ± 2.5dbm.
2-5: 21 PIN VIDEO OUT
Receive the color bar pattern.
1.
Connect the synchro scope to TP4501.
2.
Activate the adjustment mode display of Fig. 1-1 and
3.
press the channel button (5) on the remote control to select "OTHERS". The Fig. 2-2 appears on the display. Press the channel button (2) on the remote control to
4.
select "VIDEO LEVEL". Press the PLAY or STOP button on the remote control
5.
until the synchro scope is 1.0 ± 0.15V.
(TV SECTION)
2-6: CONSTANT VOLTAGE
1.
Using the remote control, set the brightness and contrast to normal position.
2.
Connect the digital voltmeter to TP401.
3.
Set condition is AV MODE without signal.
4.
Adjust the VR502 until the digital voltmeter is 110 ± 0.5V.
2-7: CUT OFF
1.
Place the set with Aging Test for more than 15 minutes.
2.
Set condition is AV MODE without signal.
3.
Using the remote control, set the brightness and contrast to normal position.
4.
Activate the adjustment mode display of Fig. 1-1 and press the channel button (5) on the remote control to select "OTHERS". The Fig. 2-2 appears on the display.
5.
Press the channel button (5) on the remote control to select "CUT OFF".
6.
Adjust the Screen Volume until a dim raster is obtained.
Fig. 2-2
2-8: WHITE BALANCE NOTE: Adjust after performing CUT OFF adjustment.
1.
Place the set with Aging Test for more than 15 minutes.
2.
Receive the white 100% signal from the Pattern Generator.
3.
Using the remote control, set the brightness and contrast to normal position.
4.
Activate the adjustment mode display of Fig. 1-1 and press the channel button (2) on the remote control to select "AKB". The Fig. 2-3 appears on the display.
5.
Press the channel button (2) on the remote control to select the "R.BIAS".
6.
Using the PLAY or STOP button on the remote control, adjust the R.BIAS.
7.
Press the CH. UP/DOWN button on the remote control to select the "G.BIAS", "B.BIAS", "R.DRIVE", "G.DRIVE" or "B.DRIVE".
8.
Using the PLAY or STOP button on the remote control, adjust the G.BIAS, B.BIAS, R.DRIVE or B.DRIVE.
9.
Perform the above adjustments 7 and 8 until the white color is looked like a white.
1. AKB AUTO
2. R.BIAS
3. G.BIAS
4. B.BIAS
5. R.DRIVE
6. G.DRIVE
7. B.DRIVE
8. AGC AUTO 0. RETURN
"The adjustment items 1 and 8 is not used for this model."
2-9: FOCUS
1.
Receive a broadcast.
2.
Turn the Focus Volume fully counterclockwise once.
3.
Adjust the Focus Volume until picture is distinct.
2-10: HORIZONTAL PHASE
1.
Receive the center cross signal from the Pattern Generator.
2.
Using the remote control, set the brightness and contrast to normal position.
3.
Activate the adjustment mode display of Fig. 1-1 and press the channel button (1) on the remote control to select "H/V". The Fig. 2-4 appears on the display.
4.
Press the channel button (1) on the remote control to select "H.PHASE".
5.
Press the PLAY or STOP button on the remote control until the right and left screen size of the vertical line becomes the same.
1. H.PHASE
2. H.BLK
3. V.SIZE 50/60
4. V.POSI 50/60
5. V.LIN 50/60
6. V.SC 50/60
7. V.COMP
8. (H. FREQ) 0. RETURN
"The adjustment item 8 is not used for this model."
D2-2
Fig. 2-3
Fig. 2-4
ELECTRICAL ADJUSTMENTS
2-11: HORIZONTAL SIZE NOTE: Adjust after performing adjustments in section 2-10.
Measurement Equipment Maker: SHIBASOKU Co. Limited Measurement Equipment Model No.:
Receive the monoscope pattern.
1.
Adjust the VR401 until the SHIFT quantity of the OVER
2.
SCAN on right and left becomes 8 ± 2%.
(Simple Adjustments)
1.
Activate the adjustment mode display of Fig. 1-1 and press the channel button (6) on the remote control to select "TEST PATTERN". The Fig. 2-5 appears on the display.
2.
Press the channel button (6) on the remote control to select "CROSS (60)".
3.
Adjust the VR401 until the right vertical line of the pattern becomes fit to the right end.
1. EXTERNAL
2. BLACK
3. WHITE (100)
4. WHITE (60)
5. CROSS (100)
6. CROSS (60)
7.
8. 0. RETURN
"The adjustment items 1, 2, 3, 4 and 5 are not used for this model."
2-12: VERTICAL LINEARITY NOTE: Adjust after performing adjustments in section 2-11.
1.
Receive the cross hatch signal from the Pattern Generator.
2.
Using the remote control, set the brightness and contrast to normal position.
3.
Activate the adjustment mode display of Fig. 1-1 and press the channel button (1) on the remote control to select "H/V". The Fig. 2-4 appears on the display.
4.
Press the channel button (5) on the remote control to select "V. LIN 50/60".
5.
Check if the step No. of VERTICAL POSITION is "31".
6.
Adjust the VR404 until the SHIFT quantity of the OVER SCAN on upside and downside becomes minimum.
7.
Receive the cross hatch signal of NTSC. (Audio Video Input)
8.
Press the AV button on the remote control to set to the AV mode.
9.
Activate the adjustment mode display of Fig. 1-1 and press the channel button (1) on the remote control to select "H/V". The Fig. 2-4 appears on the display.
10.
Press the channel button (5) on the remote control to select "V. LIN 50/60".
11.
Press the PLAY or STOP button on the remote control until the SHIFT quantity of the OVER SCAN on upside and downside becomes minimum.
DIGITAL TEST PATTERN GENERATOR 588
Fig. 2-5
2-13: VERTICAL POSITION NOTE: Adjust after performing adjustments in section 2-12.
1.
Receive the center cross signal from the Pattern Generator.
2.
Using the remote control, set the brightness and contrast to normal position.
3.
Activate the adjustment mode display of Fig. 1-1 and press the channel button (1) on the remote control to select "H/V". The Fig. 2-4 appears on the display.
4.
Press the channel button (4) on the remote control to select "V. POSI 50/60".
5.
Check if the step No. of VERTICAL POSITION is "63".
6.
Adjust the VR403 until the horizontal line becomes fit to the notch of the shadow mask.
7.
Receive the center cross signal of NTSC. (Audio Video Input)
8.
Press the AV button on the remote control to set to the AV mode. Then perform the above adjustments 2~5.
2-14: VERTICAL SIZE NOTE: Adjust after performing adjustments in section 2-13.
1.
Receive the cross hatch signal from the Pattern Generator.
2.
Using the remote control, set the brightness and contrast to normal position.
3.
Activate the adjustment mode display of Fig. 1-1 and press the channel button (1) on the remote control to select "H/V". The Fig. 2-4 appears on the display.
4.
Press the channel button (3) on the remote control to select "V. SIZE 50/60".
5.
Press the PLAY or STOP button on the remote control until the rectangle on the center of the screen becomes square.
6.
Receive a broadcast and check if the picture is normal.
7.
Receive the cross hatch signal of NTSC. (Audio Video Input)
8.
Press the AV button on the remote control to set to the AV mode. Then perform the above adjustments 2~5.
2-15: OSD HORIZONTAL
1.
Using the remote control, set the brightness and contrast to normal position.
2.
Activate the adjustment mode display of Fig. 1-1 and press the channel button (5) on the remote control to select "OTHERS". The Fig. 2-2 appears on the display.
3.
Press the channel button (4) on the remote control to select "OSD H".
4.
Press the PLAY or STOP button on the remote control until the difference of A and B becomes minimum.
(Refer to Fig. 2-6)
[ TV ]
OSD H
D2-3
AB
Fig. 2-6
ELECTRICAL ADJUSTMENTS
2-16: SUB BRIGHTNESS
1.
Receive the black pattern*. (RF Input)
2.
Using the remote control, set the brightness and contrast to normal position.
3.
Activate the adjustment mode display of Fig. 1-1 and press the channel button (4) on the remote control to select "PICTURE". The Fig. 2-7 appears on the display.
4.
Press the channel button (1) on the remote control to select "BRIGHT".
5.
Press the VOL. UP/DOWN button on the remote control until the screen begin to shine.
6.
Receive the black pattern*. (Audio Video Input)
7.
Press the TV/VCR button on the remote control to set to the AV mode. Then perform the above adjustments 2~5.
*The Black Pattern means the whole black raster signal.
Select the "RASTER" of the pattern generator, set to the OFF position for each R, G and B.
1. BRIGHT
2. CONTRAST
3. COLOUR
4. TINT
5. SHARPNESS
6. TEXT CONT
7.
8. 0. RETURN
2-18: SUB COLOR
Receive the color bar pattern. (RF Input)
1. Using the remote control, set the brightness, contrast
2. and color to normal position. Connect the synchro scope to TP804.
3. Activate the adjustment mode display of Fig. 1-1 and
4. press the channel button (4) on the remote control to select "PICTURE". The Fig. 2-7 appears on the display. Press the channel button (3) on the remote control to
5. select "COLOR". Adjust the VOLTS RANGE VARIABLE knob of the
6. oscilloscope until the range between white 100% and 0% is set to 5 scales on the screen of the oscilloscope. Press the PLAY or STOP button on the remote control
7. until the red color level is adjusted to 90% of the white level. (Refer to Fig. 2-8) Receive the color bar pattern. (Audio Video Input)
8. Press the AV button on the remote control to set to the
9. AV mode. Then perform the above adjustments 2~7.
0%
90%
Fig. 2-7
2-17: SUB CONTRAST
1.
Activate the adjustment mode display of Fig. 1-1 and press the channel button (4) on the remote control to select "PICTURE". The Fig. 2-7 appears on the display.
2.
Press the channel button (2) on the remote control to select "CONTRAST".
3.
Press the PLAY or STOP button on the remote control until the contrast step No. becomes "88"
4.
Press the AV button on the remote control to set to the AV mode.
5.
Activate the adjustment mode display of Fig. 1-1 and press the channel button (4) on the remote control to select "PICTURE". The Fig. 2-7 appears on the display.
6.
Press the channel button (2) on the remote control to select "CONTRAST".
7.
Press the PLAY or STOP button on the remote control until the contrast step No. becomes "96"
100%
Red Level
2-19: SUB SHARPNESS
1.
Activate the adjustment mode display of Fig. 1-1 and press the channel button (4) on the remote control to select "PICTURE". The Fig. 2-7 appears on the display.
2.
Press the channel button (5) on the remote control to select "SHARPNESS".
3.
Check if the step No. of SHARPNESS is "24".
4.
Press the AV button on the remote control to set to the AV mode. Then perform the above adjustments 1~3.
2-20: TEXT CONTRAST
1.
Activate the adjustment mode display of Fig. 1-1 and press the channel button (4) on the remote control to select "PICTURE". The Fig. 2-7 appears on the display.
2.
Press the channel button (6) on the remote control to select "TEXT CONT".
3.
Press the PLAY or STOP button on the remote control until the bar step is set to "0".
Fig. 2-8
D2-4
ELECTRICAL ADJUSTMENTS
2-21: V. S-CORRECTION (V. SC)
Receive the color bar pattern.
1. Activate the adjustment mode display of Fig. 1-1 and
2. press the channel button (1) on the remote control to select "H/V". The Fig. 2-4 appears on the display. Press the channel button (6) on the remote control to
3. select "V. SC 50/60". Check if the step No. of V. SC is "0".
4. Receive the color bar pattern of NTSC. (Audio Video
5. Input) Press the AV button on the remote control to set to the
6. AV mode. Then perform the above adjustments 2~4.
2-22: PIN CUSHION (PCC)
1.
Receive the color bar pattern.
2.
Using the remote control, set the brightness and contrast to normal position.
3.
Adjust the VR402 until the right and left vertical line becomes straight.
2-23: H. BLK
1.
Activate the adjustment mode display of Fig. 1-1 and press the channel button (1) on the remote control to select "H/V". The Fig. 2-4 appears on the display.
2.
Press the channel button (2) on the remote control to select "H.BLK".
3.
Switch the R/L by using the ENTER button on the remote control and check if the H. BLK step No. becomes "R2, L4".
2-24: V. COMP
1.
Activate the adjustment mode display of Fig. 1-1 and press the channel button (1) on the remote control to select "H/V". The Fig. 2-4 appears on the display.
2.
Press the channel button (7) on the remote control to select "V.COMP".
3.
Check if the step No. of V. COMP is "7".
D2-5
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