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VX-F205
U
SERVICE MANUAL
INTEGRATED COLOR TV / STEREO VIDEO CASSETTE RECORDER BASIC TAPE MECHANISM : OVD-6
SPECIFICATIONS
GENERAL POWER REQUIREMENTS ................. 120V AC, 60Hz POWER CONSUMPTION ................... 119W TYP 4W (power save mode) WEIGHT .............................................. 26.5 kg (58.5 lbs.) DIMENSIONS ...................................... 574 mm (W) x 489 mm (D) x 502 mm (H) (22 5/8 x 19 3/8 x 19 7/8 in.) TV SECTION PICTURE TUBE .................................. 406 mm (W) x 305 mm (H) (16 x 12 1/8 in.) 508 mm (diagonal) (20 in.) TUNER SYSTEM ................................ Frequency synthesized tuner CHANNEL COVERAGE ...................... VHF: 2 to 13 UHF: 14 to 69 CATV: 4A, A-1 to A-5, A to W, W+1 to W+84 PROGRAM MEMORY ......................... 181 TV SYSTEM ........................................ M HORIZONTAL RESOLUTION ............ 230 lines ANTENNA INPUT ............................... 75 ohms, unbalanced VCR SECTION OPERATING TEMPERATURE ........... 5°C to 40°C VIDEO RECORDING SYSTEM .......... Rotary 2 head helical scanning system VIDEO SIGNAL SYSTEM ................ NTSC color system, 525 lines, 60 fields VIDEO HEAD ................................... Azimuth 2 head USABLE CASSETTES ..................... VHS video cassette S-VHS video cassette (play back only) TAPE SPEED ................................... SP: 33.35 mm/sec LP: 16.67 mm/sec SLP: 11.12 mm/sec RECORDING/PLAYBACK TIME ..... SP: 3 hours with T-180 tape LP: 6 hours with T-180 tape SLP: 9 hours with T-180 tape VIDEO INPUT ................................... 1.0Vp-p, 75 ohm, unbalanced VIDEO OUTPUT .............................. 1.0Vp-p, 75 ohm, unbalanced VIDEO S/N ....................................... 53dB (nominal) AUDIO INPUT .................................. 8dBs, 50K ohm AUDIO OUTPUT .............................. 8dBs, less than 1K ohm AUDIO TRACK ................................. 3 tracks (Hi-Fi sound 2 tracks, Normal sound 1 track) FAST-FORWARD TIME ................... Approx. 2 minutes 15 seconds with T-120 tape REWIND TIME ................................. Approx. 1 minutes 48 seconds with T-120 tape HI-FI DYNAMIC RANGE .................. More than 90dB HI-FI FREQUENCY RESPONSE .... 20Hz-20kHz HI-FI WOW AND FLUTTER ............. Less than 0.01%
· Design and specifications are subject to change without notice.
S/M Code No. 09-003-341-3N1
DA TA
TABLE OF CONTENTS
SPECIFICATIONS .............................................................................................................................................................. COVER TABLE OF CONTENTS ..................................................................................................................................................... A1-1 SERVICING NOTICES ON CHECKING ............................................................................................................................. A2-1 DISASSEMBLY INSTRUCTIONS REMOVAL OF MECHANICAL PARTS AND P.C. BOARDS ........................................................................................... B1-1, B1-2 REMOVAL OF DECK PARTS .......................................................................................................................................... B2-1~B2-5 REMOVAL OF ANODE CAP ............................................................................................................................................ B3-1 KEY TO ABBREVIATIONS ................................................................................................................................................. C1-1, C1-2 SERVICE MODE LIST ....................................................................................................................................................... C2-1 PREVENTIVE CHECKS AND SERVICE INTERVALS ....................................................................................................... C3-1, C3-2 NOTE FOR THE REPLACING OF MEMORY IC ................................................................................................................ C4-1 SERVICING FIXTURES AND TOOLS ................................................................................................................................ C5-1 PREPARATION FOR SERVICING ..................................................................................................................................... C5-2, C5-3 VCR TEST TAPE INTERCHANGEABILITY TABLE ........................................................................................................... C6-1 MECHANICAL ADJUSTMENTS CONFIRMATION AND ADJUSTMENT ............................................................................................................................ D1-1, D1-2 CONFIRMATION AND ADJUSTMENT OF TAPE RUNNING MECHANISM .................................................................. D1-2, D1-3 MECHANISM ADJUSTMENT PARTS LOCATION GUIDE ............................................................................................. D1-4 ELECTRICAL ADJUSTMENTS ADJUSTMENT PROCEDURE ......................................................................................................................................... D2-1 BASIC ADJUSTMENTS ................................................................................................................................................... D2-1~D2-4 ELECTRICAL ADJUSTMENT PARTS LOCATION GUIDE ............................................................................................. D2-5, D2-6 PURITY AND CONVERGENCE ADJUSTMENTS .......................................................................................................... D2-7 TROUBLESHOOTING GUIDES .......................................................................................................................................... E-1~E-27 IC DESCRIPTIONS ............................................................................................................................................................ F1-1~F1-3 SERVO TIMING CHART .................................................................................................................................................... F2-1 SYSTEM SWITCH MODE ................................................................................................................................................... F2-2 SEMICONDUCTOR BASE CONNECTIONS ...................................................................................................................... G-1, G-2 BLOCK DIAGRAMS TV .................................................................................................................................................................................... H-1 Y/C/AUDIO/HEAD AMP/IN/OUT ...................................................................................................................................... H-2 MICON/POWER/OPERATION ......................................................................................................................................... H-3 HIFI .................................................................................................................................................................................. H-4 PRINTED CIRCUIT BOARDS (OPERATION/DECK) ......................................................................................................... I-1 OPERATION SCHEMATIC DIAGRAM ............................................................................................................................... I-2 DECK SCHEMATIC DIAGRAM ........................................................................................................................................... I-3 PRINTED CIRCUIT BOARDS (SYSCON) .......................................................................................................................... I-4~I-6 Y/C/AUDIO/HEAD AMP SCHEMATIC DIAGRAM .............................................................................................................. I-7 MICON SCHEMATIC DIAGRAM ......................................................................................................................................... I-8 CHROMA/IF SCHEMATIC DIAGRAM ................................................................................................................................ I-9 HIFI SCHEMATIC DIAGRAM .............................................................................................................................................. I-10 IN/OUT SCHEMATIC DIAGRAM ........................................................................................................................................ I-11 POWER SCHEMATIC DIAGRAM ....................................................................................................................................... I-12 SOUND AMP SCHEMATIC DIAGRAM ............................................................................................................................... I-13 PRINTED CIRCUIT BOARDS (MAIN/CRT) ........................................................................................................................ I-14~I-16 DEFLECTION SCHEMATIC DIAGRAM .............................................................................................................................. I-17 TV POWER SCHEMATIC DIAGRAM ................................................................................................................................. I-18 CRT SCHEMATIC DIAGRAM ............................................................................................................................................. I-19 INTERCONNECTION DIAGRAM ........................................................................................................................................ I-20 WAVEFORMS .................................................................................................................................................................... J-1~J-3 MECHANICAL EXPLODED VIEW ...................................................................................................................................... K1-1, K1-2 MECHANICAL REPLACEMENT PARTS LIST ................................................................................................................... K1-3 ACCESSORY REPLACEMENT PARTS LIST .................................................................................................................... K1-3 CHASSIS EXPLODED VIEW (TOP VIEW) ......................................................................................................................... K2-1 CHASSIS EXPLODED VIEW (BOTTOM VIEW) ................................................................................................................. K2-2 CHASSIS REPLACEMENT PARTS LIST ........................................................................................................................... K2-3 ELECTRICAL REPLACEMENT PARTS LIST ..................................................................................................................... K3-1~K3-5
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.
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.
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.
7. PERFORM A SAFETY CHECK AFTER 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)
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.
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
1-3: TV/VCR BLOCK (Refer to Fig. 1-3) 1. Remove the 2 screws 1. 2. Disconnect the following connectors: (CP303, CP401, CP502, CP4201 and CP4202). 3. Unlock the support 2. 4. Remove the TV/VCR Block in the direction of arrow.
1 1
Front Cabinet
1 2
UP TO RELEASE
1 2
TV/VCR Block
2 2 3 3 2 4
Back Cabinet
Fig. 1-3 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: (CP810, CP820, CP811, CP804 and CP806). 6. Remove the Main PCB in the direction of arrow.
2
Main PCB
Fig. 1-1 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.
Front Cabinet CRT PCB
2
33
3
Main PCB Holder
1
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 screw 2. 3. Remove the screw 3. 4. Remove the Deck Shield Plate in the direction of arrow.
Deck Shield Plate
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. Remove the nut 3. 5. Remove the washer 4. 6. Unlock the 2 supports 5. 7. Remove the Jack Plate in the direction of arrow (B).
Jack Plate
2 1 3 1
2 2 5
Syscon PCB (B)
3 4 5
1
(A) VCR Block
Fig. 1-5 1-6: DECK CHASSIS (Refer to Fig. 1-6) 1. Remove the 3 screws 1. 2. Disconnect the following connectors: (CP1002, CP1005, CP1006, CP4001, CP4004 and CP4005). 3. Remove the Deck Chassis in the direction of arrow.
1 1 1
Deck Holder
Fig. 1-7
Deck Chassis
Syscon PCB
Fig. 1-6
B1-2
DISASSEMBLY INSTRUCTIONS
2. REMOVAL OF DECK PARTS
2-1: TOP BRACKET (Refer to Fig. 2-1) 1. Remove the 2 screws 1. 2. Slide the 2 supports 2 and remove the Top Bracket. NOTE
Tape Guide L
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)
When you install the Top Bracket, install the screw (1) first, then install the screw (2).
REC Lever (2)
1
Top Bracket
(1)
1
Top Bracket · 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)
2
Main Chassis Main Chassis · Screw Torque: 5 ± 0.5kgf·cm
2
1. Move the Cassette Holder Ass'y to the front side. 2. Push the Locker R to remove the Cassette Side R. 3. Remove the Cassette Side L. Fig. 2-1
Cassette Side R Main Chassis Locker R
2-2: FLAP LEVER/TAPE GUIDE R (Refer to Fig. 2-2) 1. Move the Cassette Holder Ass'y to the back side. 2. Remove the Polyslider Washer 1. 3. Remove the Flap Lever. 4. Unlock the 3 supports 2 and remove the Tape Guide R.
Tape Guide R Flap Lever Cassette Side L Main Chassis
Fig. 2-4 2-5: CASSETTE SIDE L/R (Refer to Fig. 2-5) 1. Remove the Locker Spring. 2. Unlock the 4 supports 1 and then remove the Cassette Side L/R. NOTE When you install the Cassette Side L/R, be sure to move the Locker L/R after installing.
1 1
Locker Spring
2
2 2 1
Main Chassis
Fig. 2-2
2-3: TAPE GUIDE L (Refer to Fig. 2-3-A) 1. Move the Cassette Holder Ass'y to the back side. 2. Unlock the 2 supports 1 and remove the Tape Guide L. 3. Remove the REC Lever. (Recorder only)
REC Lever Locker R
1
1
Tape Guide L Cassette Side R Locker L Cassette Side L
1
Fig. 2-5
1
Main Chassis · The REC Lever is not installed on the Video Cassette Player.
Fig. 2-3-A
B2-1
DISASSEMBLY INSTRUCTIONS
2-6: LINK ASS'Y (Refer to Fig. 2-6) 1. Set the Link Ass'y to the Eject position. 2. Remove the (A) side of the Link Ass'y first, then remove the (B) side. 2-9: TENSION ASS'Y (Refer to Fig. 2-9-A) 1. Move the Inclined S Ass'y to the back side. 2. Unlock the support 1 and remove the S Reel Stopper. 3. Remove the Tension Spring. 4. Unlock the support 2 and remove the Tension Arm Ass'y. 5. Remove the Tension Adjust. 6. Unlock the 2 supports 3 and remove the Tension Band Ass'y. 7. Unlock the support 4 and remove the Tension Holder.
Tension Adjust (B) (A) Link Ass'y
Link Ass'y
3 3
Tension Band Ass'y
Main Chassis Main Chassis
Fig. 2-6
Tension Spring Tension Arm Ass'y
2-7: LOADING MOTOR ASS'Y (Refer to Fig. 2-7) 1. Remove the Link Lever. 2. Remove the Dumper Spring. 3. Remove the 2 screws 1. 4. Unlock the support 2 and remove the Loading Motor Ass'y. 5. Unlock the 2 supports 3 and remove the Deck PCB (BOT).
1
Loading Motor Ass'y S Reel Stopper
2 4 1
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)
Adjust the direction of the Marker to inside.
Dumper Spring
2
3
Main Chassis
1
Deck PCB (BOT) Link Lever
Fig. 2-9-B 2-10: T BRAKE ASS'Y (Refer to Fig. 2-10) 1. Remove the T Brake Spring. 2. Remove the T Brake Ass'y.
T Brake Ass'y
· Screw Torque: 5 ± 0.5kgf·cm
Fig. 2-7
2-8: SENSOR COVER L (Refer to Fig. 2-8) 1. Unlock the support 1 and remove the Sensor Cover L. 2. Unlock the 2 supports 2 and remove the Deck PCB (EOT).
T Brake Spring
Main Chassis
Sensor Cover L Deck PCB (EOT)
Fig. 2-10
1 2
2
Fig. 2-8
B2-2
DISASSEMBLY INSTRUCTIONS
2-11: S REEL/T REEL ASS'Y (Refer to Fig. 2-11) 1. Remove the Idler Ass'y. 2. Remove the S Reel and T Reel Ass'y. 3. Remove the 2 Polyslider Washers 1. NOTE 1. Take care not to damage the gears of the S Reel, T Reel Ass'y and Idler Ass'y. 2. The Polyslider Washer may be remained on the back of the reel. 3. Take care not to damage the shaft. 4. Do not touch the section "A" of S Reel and T Reel Ass'y. (Use gloves.) (Refer to Fig. 2-11) Do not adhere the stains on it. 5. When you install the reel, clean the shaft and oil it (KYODO OIL Slidas #150). (If you do not oil, noise may be heard in FF/REW mode.) 6. After installing the reel, adjust the height of the reel. (Refer to MECHANICAL ADJUSTMENT) NOTE 1. Do not touch the Pinch Roller. (Use gloves.) 2. When you install the Pinch Roller Ass'y, install as shown in the circle. (Refer to Fig. 2-12-B)
Fig. 2-12-B 2-13: A/C HEAD (Refer to Fig. 2-13-A) 1. Remove the screw 1. 2. Remove the A/C Head Base. 3. Remove the 3 screws 2. 4. Remove the A/C Head and A/C Head Spring. NOTE 1. Do not touch the A/C Head. (Use gloves.) 2. When you install the A/C Head Spring, install as shown in Fig. 2-13-B. (Refer to Fig. 2-13-B) 3. When you install the A/C Head, tighten the screw (1) first, then tighten the screw (2), finally tighten the screw (3).
(1) (3)
S Reel Idler Ass'y
(A)
T Reel Ass'y
1
(A)
1
2
2
Fig. 2-11 2-12: PINCH ROLLER ASS'Y/P5 ARM ASS'Y (Refer to Fig. 2-12-A) 1. Remove the P5 Spring. 2. Remove the screw 1. 3. Unlock the 2 supports 2 and remove the Cassette Opener. 4. Remove the Pinch Roller Ass'y, Pinch Roller Lever and P5 Arm Ass'y.
1
P5 Spring
2
(2) A/C Head
A/C Head Spring
1
A/C Head Base
Fig. 2-13-A
2
Cassette Opener
2
Spring Position
Pinch Roller Ass'y P5 Arm Ass'y
Fig. 2-13-B
2-14: FE HEAD (RECORDER ONLY) (Refer to Fig. 2-14)
Pinch Roller Lever
1. Remove the screw 1. 2. Remove the FE Head.
1
FE Head
Main Chassis
· Screw Torque: 5 ± 0.5kgf·cm
Fig. 2-12-A
· The FE Head is not installed on the Video Cassette Player.
Fig. 2-14
B2-3
DISASSEMBLY INSTRUCTIONS
2-15: AHC ASS'Y/CYLINDER UNIT ASS'Y (Refer to Fig. 2-15) 1. Unlock the support 1 and remove the AHC Ass'y. 2. Remove the 3 screws 2. 3. Remove the Cylinder Unit Ass'y. 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.
2
(3) AHC Ass'y Pinch Roller Cam Link Lever Spacer E-Ring Main Cam
1
Middle Gear
2 3
Joint Gear P5 Cam
Fig. 2-17-A
Cylinder Unit Ass'y
2
(1)
1
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
2
(2)
Check the hole of Main Chassis can be seen.
P5 Cam
· Screw Torque: 5 ± 0.5kgf·cm
Fig. 2-15
Marker Main Cam
2-16: CAPSTAN DD UNIT (Refer to Fig. 2-16) 1. Remove the Capstan Belt. 2. Remove the 3 screws 1. 3. Remove the Capstan DD Unit. Fig. 2-17-B
Capstan Belt Capstan DD Unit
2-18: CLUTCH ASS'Y (Refer to Fig. 2-18) 1. Remove the Polyslider Washer 1. 2. Remove the Clutch Ass'y, Ring Spring, Ring Clutch, Gear Clutch and Polyslider Washer 2. NOTE When you install the Clutch Ass'y, oil the shaft (KYODO OIL Slidas #150).
1 1
· Screw Torque: 5 ± 0.5kgf·cm
1 1
Fig. 2-16
Clutch Ass'y
2-17: MIDDLE GEAR/MAIN CAM (Refer to Fig. 2-17-A) 1. Remove the Polyslider Washer 1, then remove the Middle Gear. 2. Remove the E-Ring, then remove the Main Cam, Link Lever Spacer and P5 Cam. 3. Remove the Polyslider Washer 2, then remove the Pinch Roller Cam. 4. Remove the Polyslider Washer 3, then remove the Joint Gear.
Ring Spring Ring Clutch
Gear Clutch
2
App. 5mm
Fig. 2-18
B2-4
DISASSEMBLY INSTRUCTIONS
2-19: LOADING GEAR S/T ASS'Y (Refer to Fig. 2-19-A) 1. Remove the E-Ring 1 and remove the Main Loading Gear. 2. Remove the Capstan Brake Spring. 3. Slide the Main Rod and remove the Capstan Brake Arm Ass'y. 4. Remove the Main Rod. 5. Remove the Tension Lever. 6. Unlock the 2 supports 2 and remove the Clutch Lever. 7. Remove the screw 3. 8. Remove the LED Reflector. 9. Remove the Loading Arm S Ass'y and Loading Arm T Ass'y. 10. Remove the Loading Gear S and Loading Gear T. 11. Remove the Loading Gear Spring.
Capstan Brake Spring Capstan Brake Arm Ass'y S-S Brake Arm
2-20: INCLINED S/T ASS'Y (Refer to Fig. 2-20) 1. Unlock the support 1 and remove the P4 Cover. 2. Remove the S-S Brake Spring. 3. Unlock the support 2 and remove the Loading Gear Holder. 4. Remove the S-S Brake Arm. 5. Remove the Inclined S. 6. Remove the Inclined T. 7. Remove the 2 screws 3, then remove the Guide Roller. NOTE Do not touch the roller of Guide Roller.
Loading Gear Holder
2
Guide Roller S-S Brake Spring
1 3
Main Loading Gear Main Rod Inclined S Guide Roller
3
Tension Lever Clutch Lever Loading Gear T Inclined T
1
P4 Cover
2 2
LED Reflector
3
Loading Gear Spring Loading Arm T Ass'y Loading Gear S Loading Gear Spring · Screw Torque: 0.7 ± 0.2kgf·cm
Fig. 2-20
Loading Arm S Ass'y
Fig. 2-19-A NOTE 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
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. Location of Anode Cap 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.)
Fig. 3-3 GND on the CRT NOTE Confirm that there is no dirt, dust, etc. at the spot where the cap was located. 2. Arrange the wire of the Anode Cap and make sure the wire is not twisted. 3. Turn over the Rubber Cap. (Refer to Fig. 3-4.)
Screwdriver
CRT Support Alligator Clip
GND on the CRT
Fig. 3-1
Fig. 3-4 4. Insert one end of the Anode Support into the anode button, then the other as shown in Fig. 3-5.
2. Flip up the sides of the Rubber Cap in the direction of the arrow and remove one side of the support. (Refer to Fig. 3-2.) Rubber Cap
CRT Support Fig. 3-2
CRT
Support Fig. 3-5
5. Confirm that the Support is securely connected. 6. Put on the Rubber Cap without moving any parts.
B3-1
KEY TO ABBREVIATIONS
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 : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : 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 I H.SW Hz IC IF IND INV KIL L LED LIMIT AMP LM, LDM LP L.P.F LUMI. M MAX MINI MIX MM MOD MPX MS SW NC NR OSC OPE PB PB CTL PB-C PB-Y PCB P. CON PD PG P-P R REC REC-C REC-Y REEL BRK REEL S REF REG REW REV, RVS RF RMC RY 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
K L
M
N O P
R
S
C1-1
KEY TO ABBREVIATIONS
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 : : : : : : : : : : : : : : : : : : : : : 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 simultaneously. 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 5 seconds before Power On. Set Key VOL. (-) MIN Remocon Key 0 Releasing of V-CHIP PASSWORD. 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). 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". VOL. (-) MIN 8 Writing of EEPROM initial data. NOTE: Do not use this for the normal servicing. Display of the Adjustment MENU on the screen. Refer to the "ELECTRICAL ADJUSTMENT" (On-Screen Display Adjustment). Operations
VOL. (-) MIN
1
VOL. (-) MIN
2
VOL. (-) MIN
3
VOL. (-) MIN
4
VOL. (-) MIN
5
VOL. (-) MIN
6
VOL. (-) MIN
9
Method 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.
Operations 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 Replace when rolling becomes abnormal. Clean the Head Clean those parts in contact with the tape.
Clean the rubber, and parts which the rubber touches.
500 hours
1,000 hours
1,500 hours
2,000 hours
3,000 hours
Notes
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 5 seconds before Power On. 1. Set the VOLUME to minimum. 2. While holding down VOLUME button on front cabinet, press key 6 on remote control simultaneously. 3. After the confirmation of using hours, turn off the power.
INIT
00
83
Initial setting content of MEMORY IC. POWER ON total hours. PLAY/REC total hours.
POWER ON 0010 PLAY/REC 0003
(16 x 16 x 16 x thousands digit value) + (16 x 16 x hundreds digit value) + (16 x tens digit value) + (ones digit value)
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 5 seconds before Power On.
ADDRESS 00 01 02 03 04 05 06 07 08 09 DATA 80 6D 21 00 00 00 A4 EB 39 90 ADDRESS 0A 0B 0C 0D 0E 0F 10 11 12 13 DATA 1B B7 CB 01 00 06 6C 2B 21 15 ADDRESS 14 15 16 17 18 19 1A 1B 1C 1D DATA 90 A0 7F 66 18 07 44 86 8F FC ADDRESS 1E 1F 20 21 22 23 24 25 26 27 DATA 42 15 8D 05 11 00 39 04 00 1A ADDRESS 28 29 DATA 19 00
Table 1 1. Enter DATA SET mode by setting VOLUME to minimum. 2. While holding down VOLUME button on front cabinet, press key 6 on remote control simultaneously. 3. ADDRESS and DATA should appear as FIG 1.
ADDRESS DATA
INIT
00
83
POWER ON 0010 PLAY/REC 0003
Fig. 1 4. ADDRESS is now selected and should "blink". Using the SET + or - keys on the remote, step through the ADDRESS until required ADDRESS to be changed is reached. 5. Press ENTER to select DATA. When DATA is selected, it will "blink". 6. Again, step through the DATA using SET + or - until required DATA value has been selected. 7. Pressing ENTER will take you back to ADDRESS for further selection if necessary. 8. Repeat steps 4 to 7 until all data has been checked. 9. 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 heads model) VHS Alignment Tape JG001 (TTV-N2) JG001A (TTV-N12) JG001T (VN 2 S-X6 3 ) (For 4 heads model) VHS Alignment Tape JG001B (TTV-N2) JG001I (TTV-N12) JG001S (VN 1 S-X6 3 )
JG002B Adapter JG002E Dial Torque Gauge (10~90gf·cm) JG002F (60~600gf·cm)
JG005 Post Adjustment Screwdriver Part No. SV-TG0-030-000 (small)
JG153 X Value Adjustment Screwdriver
JG022 Master Plane
JG024A Reel Disk Height Adjustment Jig
JG100A Torque Tape (VHT-063)
JG154 Cable Parts No. SJ-G15-400-000
JG162C Cable (10 Pins) Parts No. SJ-G16-2C0-000 JG162D Cable (11 Pins) Parts No. SJ-G16-2D0-000 JG162Y Cable (5 Pins) Parts No. SJ-G16-2Y0-000
Tentelometer
Part No. JG001 JG001A JG001T JG001B JG001I JG001S JG002B JG002E JG002F JG005 JG153 JG022/JG024A JG100A JG154 JG162C/JG162D JG162Y Stair Steps, 7KHz (For 2 heads model) Color Bar, 1KHz (For 2 heads model) X Value Adjustment (For 2 heads model) Stair Steps, 7KHz (For 4 heads model) Color Bar, 1KHz (For 4 heads model) X Value Adjustment (For 4 heads model)
Remarks
VSR Torque, Brake Torque (S Reel/T Reel Ass'y) Brake Torque (T Reel Ass'y) VSR Torque, Brake Torque (S Reel) Guide Roller Adjustment X Value Adjustment Reel Disk Height Adjustment Playback Torque, Back Tension Torque During Playback Used to connect the test point of SERVICE and GROUND Used to connect the Syscon PCB and Main PCB Used to connect the Syscon PCB and CRT PCB
C5-1
PREPARATION FOR SERVICING
Basic Servicing Position (In case of needing to check on all blocks) 1. Unplug the connector CP4201, CP4202 and CP303, 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 Syscon PCB to the Main PCB with the cable JG162C and JG162D. · 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 CP4202. (Front A/V Jack Input Terminal) 5. Short circuit between TP1001 and GND with the cable JG154. (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 CRT PCB CP805
CP820
Main PCB JG162Y
CP810 JG162D
CP602 JG162C CP601 Syscon PCB CP1003
CP4201 TP1001
JG154 To Ground Operation PCB CD757
CD702
C5-2
PREPARATION FOR SERVICING
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. Now in use TYPE Method Model Contents*1 Model Contents*1 New TYPE Application
TTV-N1
NTSC, Color, 1kHz, SP
CH-1B(2) NTSC, Stairsteps, 1kHz, SP
PB-Y Level/General electrical ADJ. Head ACE Height/Tilt ADJ.
TTV-N1E NTSC TTV-N2
NTSC, Color, 1kHz, EP
CH-1B(4) *2
NTSC, Color, 1kHz, EP
Switching position ADJ.
NTSC, Stairsteps, NTSC, Stairsteps, Head ACE Azimuth ADJ. CH-1B(1) 7kHz, SP 7kHz, SP
TTV-N12
(SCV-1998)
NTSC, Color, 1kHz, SP
CH-1B(4)
NTSC, Color, 1kHz, EP
FM envelope ADJ. X-Value ADJ.
TTV-N7A
NTSC, Stairsteps, NTSC, Color, No 1kHz, SP, HiFi CH-1B(3) sound SP, HiFi 400Hz 400Hz
HiFi Audio PB Level ADJ.
TTV-P1
PAL, Color, 1kHz, SP
CH-2(2) *3
PAL, Stairsteps, 1kHz, SP
Switching position ADJ. PB-Y Level/General electrical ADJ. Head ACE Height/Tilt ADJ.
TTV-P1L PAL TTV-P2
PAL, Color, 1kHz, LP
CH-2(4)
PAL, Color, 1kHz, LP
Switching position. (LP Model) FM Envelope ADJ. (LP Model) X-Value ADJ. (LP Model)
PAL, Stairsteps, 6kHz, SP
CH-2(1)
PAL, Stairsteps, 6kHz, SP
Head ACE Azimuth ADJ. FM Envelope ADJ. (SP Model) X-Value ADJ. (SP Model)
TTV-P7
PAL, Stairsteps, 1kHZ, SP, HiFi, 1kHz PAL, Color, 400Hz, SP, HiFi 1kHz
CH-2(3)
PAL, Color, No sound SP, HiFi 400Hz
HiFi Audio PB Level ADJ.
TTV-P16
No Changed.
FM Filter ADJ.
*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.
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. 1-1: CONFIRMATION AND ADJUSTMENT OF REEL 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. 11-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
(A) Reel Disk Height Adjustment Jig (JG024A) Cut Position
(B) Tension Adjust
Fig. 1-2-B 1-3: CONFIRMATION OF PLAYBACK TORQUE AND BACK TENSION TORQUE DURING PLAYBACK Fig. 1-1-A
Reel Disk Height Adjustment Jig (JG024A)
1. Load a video tape (T-120) recorded in standard speed mode. Set the unit to the PLAY mode. 2. Install the tentelometer as shown in Fig. 1-3. Confirm that 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 70~110gf·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
Reel Disk
Master Plane (JG022)
(B)
10(+0.2, -0)mm (C)
(A) Height Adjustment Washer 2.6x4.7xT0.13 2.6X4.7xT0.25
Video Tape
Fig. 1-1-B
P1 Post
Guide Roller
Fig. 1-3
D1-1
MECHANICAL ADJUSTMENTS
1-4: CONFIRMATION OF VSR TORQUE 1. Operate within 4~5 seconds after the reel disk begins to turn. 2. Install the Torque Gauge (JG002F) and Adapter (JG002B) on the S Reel. Set to the Rewind mode. (Refer to Fig.1-4) 3. Then, confirm that it indicates 120~180gf·cm. 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) 1. Set to the STOP mode. 2. Move the Idler Ass'y from the S Reel. 3. Install the Torque Gauge (JG002F) and Adapter (JG002B) on the S Reel. Turn the Torque Gauge (JG002F) clockwise. 4. Then, confirm that it indicates 70~100gf·cm. (T Reel Brake) (Refer to Fig. 1-4) 1. Set to the STOP mode. 2. Move the Idler Ass'y from the T Reel Ass'y. 3. Install the Torque Gauge (JG002E) and Adapter (JG002B) on the T reel. Turn the Torque Gauge (JG002E) counterclockwise. 4. Then, confirm that it indicates 35~60gf·cm.
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 1. Playback the VHS Alignment Tape (JG001 or JG001B). (Refer to SERVICING FIXTURE AND TOOLS) 2. Connect CH-1 of the oscilloscope to TP4001 (Envelope) and CH-2 to TP1002 (SW Pulse). 3. Press and hold the TRACKING-AUTO button on the remote control more than 2 seconds to set tracking to center. 4. Trigger with SW Pulse and observe the envelope. (Refer to Fig. 2-1-A) 5. When observing the envelope, adjust the Adjusting Driver (JG005) slightly until the envelope will be flat. Even if you press the Tracking Button, adjust so that flatness is not moved so much. 6. Adjust so that the A : B ratio is better than 3 : 2 as shown in Fig. 2-1-B, even if you press the Tracking Button to move the envelope (The envelope waveform will begins to decrease when you press the Tracking Button). 7. Adjust the PG shifter during playback. (Refer to the ELECTRICAL ADJUSTMENTS) NOTE After adjustment, confirm and adjust A/C head. (Refer to item 2-2)
Torque Gauge/Adapter (JG002E/JG002B)
CH-1 Envelope (TP4001)
CH-1 Track CH-2 SW Pulse (TP1002)
CH-2 Track
S Reel Envelope
T Reel Ass'y
Fig. 1-4
(1) CH-3 Audio (2)
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
Max
Fig. 2-1-A
Entrance
Exit
A
B
Max
A:B=3:2
Fig. 2-1-B
D1-2
MECHANICAL ADJUSTMENTS
2-2: 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 (JG001 or JG001B). (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: TAPE RUNNING ADJUSTMENT (X VALUE ADJUSTMENT) 1. Confirm and adjust the height of the Reel Disk. (Refer to item 1-1) 2. Confirm and adjust the position of the Tension Post. (Refer to item 1-2) 3. Adjust the Guide Roller. (Refer to item 2-1) 4. Confirm and adjust the Audio/Control Head. (Refer to item 2-2) 5. Connect CH-1 of the oscilloscope to TP4001, CH-2 to TP1002 and CH-3 to HOT side of Audio Out Jack. 6. Playback the VHS Alignment Tape (JG001S or JG001T). (Refer to SERVICING FIXTURE AND TOOLS) 7. Press and hold the TRACKING-AUTO button on the remote control more than 2 seconds to set tracking to center. 8. Set the X Value adjustment driver (JG153) to the 4 of 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.
Stamp Mark
Fig. 2-2-A
Audio/Control Head
3
1
2 4
Fig. 2-2-B
Audio/Control Head Tape
0.25±0.05mm
Fig. 2-2-C
D1-3
MECHANICAL ADJUSTMENTS
3. MECHANISM ADJUSTMENT PARTS LOCATION GUIDE
5
6
4
3 7 2 1 8
12
11
10
9
1. Tension Adjust 7. P4 Post 2. Tension Arm 8. T Brake Spring 3. Guide Roller 9. T Reel Ass'y 4. P1 Post 10. Idler Ass'y 5. Audio/Control Head 11. S-S Brake Spring 6. X value adjustment driver hole 12. S Reel
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. Unplug the AC plug for more than 5 seconds to set the clock to the non-setting state. Then, set the volume level to minimum. 2. Press the VOL. DOWN button on the set and the channel button (9) on the remote control simultaneously 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) on the remote control to end the adjustments. 1. H/V 2. AKB 3. COLOR TEMP 4. PICTURE 5. OTHERS 6. TEST PATTERN 7. STEREO/SAP 8. (VOL TEST) 0. END "The adjustment items 3, 7 and 8 are not used for this model." Fig. 1-1
6.5H 6.5H CH-1 CH-2
Fig. 2-1-A
CH-2
CH-1
Fig. 2-1-B 2-2: VCO FREERUN 1. Place the set with Aging Test for more than 15 minutes. 2. Receive the VHF HIGH. 3. Disconnect the Antenna while receiving the VHF HIGH and set to the Noise screen. 4. Once turn off the Power and turn on the Power again. 5. Approxi. 3 seconds later, input the Antenna again. 6. Connect the digital voltmeter to TP601. 7. Adjust the L610 until the digital voltmeter is 3.1 ± 0.05V. 2-3: RF AGC 1. Receive the VHF HIGH (70dB). 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. The Fig. 2-2 appears on the display. 4. Press the channel button (1) on the remote control. 5. Press the VOL. UP/DOWN button on the remote control until the digital voltmeter is 2.25 ± 0.05V. 1. RF AGC DELAY 2. VIDEO LEVEL 3. FM LEVEL 4. OSD H 5. CUT OFF 6. 7. 8. 0. RETURN "The adjustment item 2 is not used for this model." Fig. 2-2 2-4: TUNER AUDIO LEVEL 1. Receive the VHF HIGH (70dB). 2. Connect the AC voltmeter to AUDIO OUT L/R. 3. Activate the adjustment mode display of Fig. 1-1 and press the channel button (5) on the remote control. The Fig. 2-2 appears on the display. 4. Press the channel button (3) on the remote control. 5. Press the VOL. UP/DOWN button on the remote control until the AC voltmeter is 310 ± 10mVrms. D2-1
2. BASIC ADJUSTMENTS (VCR SECTION)
2-1: PG SHIFTER 1. Connect CH-1 on the oscilloscope to TP1002 and CH-2 to TP4201. 2. Playback the alignment tape. (JG001A) 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. Press the Tracking Auto button.
ELECTRICAL ADJUSTMENTS
2-5: STEREO SEPARATION NOTE: Adjust after performing adjustments in section 2-4. 1. Receive the stereo signal. (L=2KHz, R=400Hz) 2. Connect the AC voltmeter to AUDIO OUT L/R through stereo filter (L=400Hz, R=2KHz). 3. Check if the difference between with the stereo filter and without the stereo filter is more than 23dB. 2-9: HORIZONTAL SIZE NOTE: Adjust after performing adjustments in section 2-8. Measurement Equipment Maker: SHIBASOKU Co. Limited Measurement Equipment Model No.: DIGITAL TEST PATTERN GENERATOR 588 1. Receive the monoscope pattern. 2. Adjust the VR401 until the SHIFT quantity of the OVER SCAN on right and left becomes 10 ± 2%. (Simple Adjustments) 1. Activate the adjustment mode display of Fig. 1-1 and press the channel button (6) on the remote control. The Fig. 2-5 appears on the display. 2. Press the channel button (6) on the remote control. 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." Fig. 2-5 2-10: VERTICAL SIZE NOTE: Adjust after performing adjustments in section 2-9. OSD H 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. The Fig. 2-4 appears on the display. 4. Press the channel button (3) on the remote control. 5. Press the VOL. UP/DOWN 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. 2-11: VERTICAL LINEARITY NOTE: Adjust after performing adjustments in section 2-10. 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. The Fig. 2-4 appears on the display. 4. Press the channel button (5) on the remote control. 5. Press the VOL. UP/DOWN button on the remote control until the SHIFT quantity of the OVER SCAN on upside and downside becomes minimum.
(TV SECTION)
2-6: CONSTANT VOLTAGE 1. Connect the digital voltmeter to TP501. 2. Set condition is AV MODE without signal. 3. Adjust the VR502 until the DC voltage is 111 ± 0.5V. 2-7: 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. The Fig. 2-2 appears on the display. 3. Press the channel button (4) on the remote control. 4. Press the VOL. UP/DOWN button on the remote control until the difference of A and B becomes minimum. (Refer to Fig. 2-3)
[ TV ]
A 2-8: HORIZONTAL PHASE
B
Fig. 2-3
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. The Fig. 2-4 appears on the display. 4. Press the channel button (1) on the remote control. 5. Press the VOL. UP/DOWN 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 4. V. POSI 5. V. LIN 6. V. SC 7. V. COMP 8. (H FREQ)
0. RETURN
"The adjustment item 8 is not used for this model." Fig. 2-4
D2-2
ELECTRICAL ADJUSTMENTS
2-12: VERTICAL POSITION NOTE: Adjust after performing adjustments in section 2-11. 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. The Fig. 2-4 appears on the display. 4. Press the channel button (4) on the remote control. 5. Press the VOL. UP/DOWN button on the remote control until the horizontal line becomes fit to the notch of the shadow mask. 2-13: FOCUS 1. Receive a broadcast. 2. Turn the Focus Volume fully counterclockwise once. 3. Adjust the Focus Volume until picture is distinct. 2-14: 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. The Fig. 2-2 appears on the display. 5. Press the channel button (5) on the remote control. 6. Adjust the Screen Volume until a dim raster is obtained. Red Level 2-15: 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. The Fig. 2-6 appears on the display. 4. Press the channel button (1) on the remote control. 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. COLOR 4. TINT 5. SHARPNESS 6. OSD CONT 7. 8. White 100% 2-17: SUB TINT 1. Receive the color bar pattern. (RF Input) 2. Using the remote control, set the brightness, contrast, color and tint to normal position. 3. Connect the synchro scope to TP806. 4. Activate the adjustment mode display of Fig. 1-1 and press the channel button (4) on the remote control. The Fig. 2-6 appears on the display. 5. Press the channel button (4) on the remote control. 6. Press the VOL. UP/DOWN button on the remote control until the section "A" becomes a straight line. (Refer to Fig. 2-8) 7. Receive the color bar pattern. (Audio Video Input) 8. Press the TV/VCR button on the remote control to set to the AV mode. Then perform the above adjustments 2~6. Fig. 2-7 2-16: SUB COLOR 1. Receive the color bar pattern. (RF Input) 2. Using the remote control, set the brightness, contrast, color and tint to normal position. 3. Connect the synchro scope to TP804. 4. Activate the adjustment mode display of Fig. 1-1 and press the channel button (4) on the remote control. The Fig. 2-6 appears on the display. 5. Press the channel button (3) on the remote control. 6. Adjust the VOLTS RANGE VARIABLE knob of the oscilloscope until the range between white 100% and 0% is set to 4 scales on the screen of the oscilloscope. 7. Press the VOL. UP/DOWN button on the remote control until the red color level is adjusted to 100 ± 5% of the white level. (Refer to Fig. 2-7) 8. Receive the color bar pattern. (Audio Video Input) 9. Press the TV/VCR button on the remote control to set to the AV mode. Then perform the above adjustments 2~7. White 0% 0%
100%
0. RETURN
Fig. 2-6 "A" Fig. 2-8
D2-3
ELECTRICAL ADJUSTMENTS
2-18: SUB CONTRAST 1. Activate the adjustment mode display of Fig. 1-1 and press the channel button (4) on the remote control. The Fig. 2-6 appears on the display. 2. Press the channel button (2) on the remote control. 3. Press the VOL. UP/DOWN button on the remote control until the contrast step No. becomes "67" 4. Press the TV/VCR button on the remote control to set to the AV mode. Then perform the above adjustments 1~3. 2-19: SUB SHARPNESS 1. Activate the adjustment mode display of Fig. 1-1 and press the channel button (4) on the remote control. The Fig. 2-6 appears on the display. 2. Press the channel button (5) on the remote control. 3. Check if the step No. of SHARPNESS is "40". 4. Press the TV/VCR button on the remote control to set to the AV mode. Then perform the above adjustments 1~3. 2-20: OSD CONTRAST 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 (4) on the remote control. The Fig. 2-6 appears on the display. 3. Press the channel button (6) on the remote control. 4. Check if the step No. of OSD CONT. is "0". 2-21: 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. 2-22: WHITE BALANCE NOTE: Adjust after performing adjustments in section 2-14. 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. The Fig. 2-9 appears on the display. 5. Perform channel button 2 through 7 on the remote control until the screen becomes 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 2-23: H. BLK 1. Activate the adjustment mode display of Fig. 1-1 and press the channel button (1) on the remote control. The Fig. 2-4 appears on the display. 2. Press the channel button (2) on the remote control. 3. Switch the R/L by using the ENTER button on the remote control and check if the H. BLK step No. becomes "R0, L4". 2-24: V. S-CORRECTION (V. SC) 1. Activate the adjustment mode display of Fig. 1-1 and press the channel button (1) on the remote control. The Fig. 2-4 appears on the display. 2. Press the channel button (6) on the remote control. 3. Check if the step No. of V. SC is "0". 2-25: V. COMP 1. Activate the adjustment mode display of Fig. 1-1 and press the channel button (1) on the remote control. The Fig. 2-4 appears on the display. 2. Press the channel button (7) on the remote control. 3. Check if the step No. of V. COMP is "7".
0. RETURN
"The adjustment items 1 and 8 are not used for this model." Fig. 2-9
D2-4
ELECTRICAL ADJUSTMENTS
3. ELECTRICAL ADJUSTMENT PARTS LOCATION GUIDE (VCR SECTION)
TP1001
TP1002
TP4001
TU601 CP603 L610
TP601 TP4201 J4201
SYSCON PCB
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ELECTRICAL ADJUSTMENTS
(TV SECTION)
TP804 TP806 VR402 VR401 TP501 FB401 J801
T501
FOCUS VOLUME SCREEN VOLUME
CRT PCB
VR502
MAIN PCB
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ELECTRICAL ADJUSTMENTS
4. PURITY AND CONVERGENCE ADJUSTMENTS
NOTE 1. Turn the unit on and let it warm up for at least 30 minutes before performing the following adjustments. 2. Place the CRT surface facing east or west to reduce the terrestrial magnetism. 3. Turn ON the unit and demagnetize with a Degauss Coil. 4-1: STATIC CONVERGENCE (ROUGH ADJUSTMENT) 1. Tighten the screw for the magnet. Refer to the adjusted CRT for the position. (Refer to Fig. 4-1) If the deflection yoke and magnet are in one body, untighten the screw for the body. 2. Receive the green raster pattern from the color bar generator. 3. Slide the deflection yoke until it touches the funnel side of the CRT. 4. Adjust center of screen to green, with red and blue on the sides, using the pair of purity magnets. 5. Switch the color bar generator from the green raster pattern to the crosshatch pattern. 6. Combine red and blue of the 3 color crosshatch pattern on the center of the screen by adjusting the pair of 4 pole magnets. 7. Combine red/blue (magenta) and green by adjusting the pair of 6 pole magnets. 8. Adjust the crosshatch pattern to change to white by repeating steps 6 and 7. 4-2: PURITY NOTE Adjust after performing adjustments in section 4-1. 1. Receive the green raster pattern from color bar generator. 2. Adjust the pair of purity magnets to center the color on the screen. Adjust the pair of purity magnets so the color at the ends are equally wide. 3. Move the deflection yoke backward (to neck side) slowly, and stop it at the position when the whole screen is green. 4. Confirm red and blue colors. 5. Adjust the slant of the deflection yoke while watching the screen, then tighten the fixing screw. DEFLECTION YOKE DEFLECTION YOKE SCREW MAGNET SCREW 4-3: STATIC CONVERGENCE NOTE Adjust after performing adjustments in section 4-2. 1. Receive the crosshatch pattern from the color bar generator. 2. Combine red and blue of the 3 color crosshatch pattern on the center of the screen by adjusting the pair of 4 pole magnets. 3. Combine red/blue (magenta) and green by adjusting the pair of 6 pole magnets. 4-4: DYNAMIC CONVERGENCE NOTE Adjust after performing adjustments in section 4-3. 1. Adjust the differences around the screen by moving the deflection yoke upward/downward and right/left. (Refer to Fig. 4-2-a) 2. Insert three wedges between the deflection yoke and CRT funnel to fix the deflection yoke. (Refer to Fig. 4-2-b) RGB RGB
R G B
R G B RIGHT/LEFT SLANT
UPWARD/DOWNWARD SLANT
Fig. 4-2-a
WEDGE
WEDGE
WEDGE WEDGE POSITION Fig. 4-2-b
6 POLE MAGNETS 4 POLE MAGNETS PURITY MAGNETS Fig. 4-1
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TROUBLESHOOTING GUIDE
(Television division)
( 1 ) that a power supply doesn't enter (In case that there isn't a normal tension for time to do stanby CD810 every terminal)
Is there output on the secondary of T501 dimensions or not? YES
NO
Voltage of C507 is it normal? YES
NO
Investigate R501 and F501.
Whether there is output for IC501 3rd pin or not? YES Investigate T501.
NO
Investigate IC506 and IC501.
Whether is POWER FAIL normal? YES
NO
Investigate T502.
AT6V is it normal?
NO
Investigate IC505.
YES
P.CON 9