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MVT2090 Series A
SERVICE MANUAL
COLOR TELEVISION/VIDEO CASSETTE RECORDER
ORIGINAL MFR'S VERSION A
Design and specifications are subject to change without notice.
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 cathoderay 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 cathoderay 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
HOW TO ORDER PARTS
Please include the following informations when you order parts. (Particularly the VERSION LETTER.) 1. MODEL NUMBER and VERSION LETTER The MODEL NUMBER can be found on the back of each product and the VERSION LETTER can be found at the end of the SERIAL NUMBER. 2. PART NO. and DESCRIPTION You can find it in your SERVICE MANUAL.
A1-1
CONTENTS
SERVICING NOTICES ON CHECKING ...................................................................................... HOW TO ORDER PARTS ........................................................................................................... CONTENTS .................................................................................................................................. GENERAL SPECIFICATIONS .................................................................................................... DISASSEMBLY INSTRUCTIONS 1. REMOVAL OF MECHANICAL PARTS AND P. C. BOARDS ............................................. 2. REMOVAL OF DECK PARTS ............................................................................................. 3. REMOVAL OF ANODE CAP ............................................................................................... 4. REMOVAL OF DEFLECTION YOKE .................................................................................. 5. REMOVAL AND INSTALLATION OF FLAT PACKAGE IC ................................................ KEY TO ABBREVIATIONS ......................................................................................................... SERVICE MODE LIST ................................................................................................................. PREVENTIVE CHECKS AND SERVICE INTERVALS ............................................................... WHEN REPLACING EEPROM (MEMORY) IC ........................................................................... SERVICING FIXTURES AND TOOLS ........................................................................................ PREPARATION FOR SERVICING .............................................................................................. MECHANICAL ADJUSTMENTS ................................................................................................. ELECTRICAL ADJUSTMENTS ................................................................................................... BLOCK DIAGRAMS TV ............................................................................................................................................. Y/C/AUDIO/CCD/HEAD AMP .................................................................................................. MICON/IN/OUT......................................................................................................................... PRINTED CIRCUIT BOARDS MAIN/CRT ................................................................................................................................ SYSCON ................................................................................................................................... SCHEMATIC DIAGRAMS Y/C/AUDIO/CCD/HEAD AMP .................................................................................................. MICON ...................................................................................................................................... REGULATOR ............................................................................................................................ IN/OUT ...................................................................................................................................... CHROMA ................................................................................................................................. SOUND AMP ............................................................................................................................ TV POWER ............................................................................................................................... DEFLECTION ........................................................................................................................... CRT ........................................................................................................................................... INTERCONNECTION DIAGRAM ................................................................................................ WAVEFORMS .............................................................................................................................. MECHANICAL EXPLODED VIEWS ............................................................................................ CHASSIS EXPLODED VIEWS .................................................................................................... MECHANICAL REPLACEMENT PARTS LIST ......................................................................... CHASSIS REPLACEMENT PARTS LIST .................................................................................. ELECTRICAL REPLACEMENT PARTS LIST ...........................................................................
A1-1 A1-1 A2-1 A3-1~A3-4 B1-1, B1-2 B2-1~B2-6 B3-1 B3-2 B4-1, B4-2 C1-1, C1-2 C2-1 C3-1, C3-2 C4-1 D1-1 D1-2 D2-1~D2-4 D3-1~D3-6 E-1, E-2 E-3, E-4 E-5, E-6 F-1, F-2 F-3~F-6 G-1, G-2 G-3, G-4 G-5, G-6 G-7, G-8 G-9, G-10 G-11, G-12 G-13, G-14 G-15, G-16 G-17, G-18 G-19, G-20 H-1, H-2 I1-1, I1-2 I2-1, I2-2 J1-1 J2-1 J3-1~J3-3
A2-1
GENERAL SPECIFICATIONS
G-1 TV System CRT CRT Size / Visual Size CRT Type Deflection Magnetic Field BV/BH 9 inch / 222.8mmV Normal 90 degree +0.45G / 0.18G NTSC 1Speaker Side 3 Inch 8 ohm 1.2 W 0.8 W VHS Player / Recorder NTSC No OVD-7 Front 3 2 Head No Mono Yes SP/SLP SP/LP/SLP FF:4'50"/REW:2'30" at T-120 SP/LP/SLP=3x,5x/7x,9x/9x,15x US Sysytem M 1Tuner USA/CANADA+CATV F-Synth VHF/UHF 75 ohm 2~69, 4A,A-5~A-1, A~I, J~W,W+1~W+84 45.75MHz 41.25MHz 4.5MHz No No 1 V p-p/75 ohm 1 V p-p/75 ohm 50 dB 230Lines RCA-8dB/50Kohm RCA-8dB/ 1Kohm 38dB 0.015 100Hz ~10kHz 100Hz ~4kHz 120V 60Hz 12V 48 W at 120V 60Hz 48 W at 12 V 3 W at 120V 60 Hz Yes Yes UL FCC DHHS +5oC ~ +40oC -20oC ~ +60oC Less then 80% RH Yes Character
Color System Speaker Position Size Impedance MAX 10%(Typical)
Sound Output G-2 VCR System System Video System Hi-Fi STEREO NTSC PB Deck
DECK Loading System Motor Video Head FM Audio Head
Heads
G-3
G-4
G-5
G-6
G-7 G-8 G-9
Audio /Control Erase(Full Track Erase) Tape Rec PAL Speed NTSC Play PAL NTSC Fast Forward / Rewind Time (Approx.) Cassette Forward/Reverse NTSC or PAL-M Picture Search Frame Advance Slow Slow Speed Variable Slow Tuning Broadcasting System System Tuner and System Receive CH Destination Tuning System Input Impedance CH Coverage Intermediate Picture(FP) Frequency Sound(FS) FP-FS Preset CH Stereo/Dual TV Sound Signal Video Signal Input Level Output Level S/N Ratio (Weighted) Horizontal Resolution at SP Mode Audio Signal Input Level Output Level S/N Ratio at SP Harmonic Distortion (1KHz) Frequency Response at SP at LP at SLP Hi-Fi Audio Signal Dynamic Range : More than Wow And Flutter : Less than Channel Separation : More than Harmonic Distortion : Less than Power Power Source AC DC Power Consumption at AC at DC Stand by (at AC) Per Year Protector Power Fuse Dew Sensor Regulation Safety Radiation X-Radiation Temperature Operation Storage Operating Humidity On Screen Menu Display Menu Type
A3-1
GENERAL SPECIFICATIONS
Timer Rec Set Channel Setup TV/CATV Auto ch Memory Add/Delete Guide ch Set TV Setup V-chip Set On/Off Timer Set Picture Audio Sap On/Off Auto Repeat On/Off On/Off Timer Set System Setup Clock Set Language Auto Clock On/Off Standard Time Daylight Saving Time Commercial Advance Marking On/Off Blueback On/Off Playback Auto/Manual Unmarked Tape Movie Advance Go To Movie Go To Preview G-CODE(or SHOWVIEW or PLUSCODE)No. Entry Clock CH/AV Tape Counter(Linear Counter) Tape Speed Sleep Time Stereo/Audio Output Bilingal SAP Control Volume Level Bright / Contrast / Sharpness/Color Tint Bass/Treble/Balance Manual Tracking Play/Stop/FF/Rew/Rec/OTR/T-Rec/Pause/Eject/Tape In (Symbol Mark) Auto Tracking/Manual Tracking Caption / Text Index Muting Hi-Fi Repeat Zero Return DEW G-10 G-11 OSD Language Clock,Timer and Timer Back-up OSD Language Setting Calendar Timer Events One Touch Recording Max Time OTPB Valid Time Sleep Timer Max Time Step On/Off Timer Program(On Tim / Off Tim) Auto Shut Off No Signal No Operation Timer Back-up (at Power Off Mode) Unit Glow in Dark Remocon Power Source Voltage(D.C) UM size x pcs Total Keys Keys Power 1 2 3 4 5 6 7 8 Yes Yes Yes Yes Yes No Yes Yes Yes Yes No No Yes No Yes Yes Yes Yes Yes Yes No No No No No No No No No Yes Yes Yes Yes Yes No No No Yes Yes Yes No Yes Yes Yes Yes No Yes No Yes No Yes English French Spanish English 1990/1/1 ~ 2081/12/31 8 prog/ 1 month 5 Hours No 120 min. 10 min. 1 prog. 15 min. 30 sec. RC-CG Yes 3V UM-4 x 2 pcs 41 Keys Yes Yes Yes Yes Yes Yes Yes Yes Yes
G-12
Remote Control
A3-2
GENERAL SPECIFICATIONS
9 0 CH Up CH Down Volume Up Volume Down Input Select Play F.Fwd Rew Pause/Still Stop Rec/OTR Eject Counter Reset Speed Timer Rec TV Monitor Quick View Program Slow Auto Tracking Set/Tracking+ Set/ Tracking Menu Enter Cancel Call TV/Caption/Text Sleep Timer Muting Zero Return CM Skip Audio Select G-13 Features Auto Head Cleaning Auto Tracking HQ (VHS Standard High Quality) Auto Power On, Auto Play, Auto Rewind, Auto Eject VIDEO PLUS+(SHOWVIEW,G-CODE) Auto Clock Forward / Reverse Picture Search One Touch Playback Auto CH Memory Closed Caption TV Auto Shut off Function End Call Index Search SQPB CATV CM Skip(30sec x 6 Times) Comb Filter TV Monitor Program Extend Choke Coil Energy Star Dirty Head V-chip USA V-chip CANADA V-chip CM Advance Movie Advance Owner's Manual Language w/Guarantee Card Remote Control Unit Rod Antenna Poles Terminal w/300 ohm to 75 ohm Antenna Adapter Loop Antenna Terminal U/V Mixer DC Car Cord (Center+) Guarantee Card Warning Sheet Circuit Diagram Antenna Change Plug Service Facility List Columbia Offer Sheet Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes No Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes No Yes Yes Yes Yes No Yes Yes No Yes Yes Yes No No No Yes Yes No Yes No No Yes No Yes No No No English/Spanish No Yes Yes 2pole F type Yes No No Yes Yes No No No No No
G-14
Accessories
A3-3
GENERAL SPECIFICATIONS
Tent Card Important Safeguard Dew/AHC Caution Sheet AC Plug Adapter Quick Set-up Sheet Battery UM size x pcs AC Cord AV Cord (2Pin-1Pin) Registration Card ESP Card 300 ohm to 75 ohm Antenna Adapter Interface Switch Power Play Pause/Still System Select One Touch Playback Channel Up Channel Down F.FWD/Cue Eject/Stop Main Power SW Volume Up Volume Down Rew/Rev Rec/OTR Input Select Indicator Power Rec/OTR T-Rec On Timer CS Key Light up Rec/OTR One Touch Playback Play Terminals Front Video Input Audio Input Other Terminal Rear Video Input Audio Input Video Output Audio Output Euro Scart Diversity Ext Speaker DC Jack 12V(Center +) VHF/UHF Antenna Input AC Inlet Set Size Approx. W x D x H (mm) Weight Net (Approx.) Gross (Approx.) Carton Master Carton Content Material Dimensions W x D x H(mm) Description of Origin Gift Box Material Dimensions W x D x H(mm) Design Description of Origin Drop Test Natural Dropping At Height (cm) Container Stuffing(40' container) Cabinet Material Cabinet Front Cabinet Rear Jack Panel No No No No No No UM4 x 2 pcs No No No No No Yes Yes No No No Yes Yes Yes Yes No Yes Yes Yes Yes No Red Red Red No No No No No RCAx1 RCAx1 Head Phone(Stereo & Mono, 3.5mm) x 2 RCAx1 RCAx1 RCAx1 RCAx1 No No No Yes F Type No 278 x 312.5 x 311.5 8.8 kg (19.4 lbs) 10.5 kg (23.1 lbs) No Yes Double/Brown CORRUGATED 338 x 381 x 386 As per Buyer's Yes 1 Corner / 3 Edges / 6 Surfaces 62 1260 Sets PS 94V0 DECABROM PS 94V0 DECABROM PS 94V0 DECABROM
G-15
G-16 G-17 G-18
G-19
A3-4
DISASSEMBLY INSTRUCTIONS
1. REMOVAL OF MECHANICAL PARTS AND P.C. BOARDS
1-1: BACK CABINET (Refer to Fig. 1-1) 1. Remove the 4 screws 1. 2. Remove the 1 screws 2. 3. Remove the 2 screw 4. 4. Remove the 2 screws 3 which are used for holding the Back Cabinet. 5. Remove the AC cord from the AC cord hook 5. 6. 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: (CP353, CP401 and CP403). 3. Unlock the support 2. 4. Remove the TV/VCR Block in the direction of arrow.
Front Cabinet
1
1
2
UP TO RELEASE
1 1 4 4
TV/VCR Block
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 screw 3. 5. Remove the 2 screws 4. 6. Disconnect the following connectors: (CP502 and CP820). 7. Remove the Main PCB in the direction of arrow.
2
Main PCB
1 3 3 2 1 5
Back Cabinet
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: (CP801 and CP850). 3. Remove the CRT PCB in the direction of arrow.
2 3
4 4
Main PCB Holder
1
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 screw 2. 3. Remove the Deck Shield Plate in the direction of arrow 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 5. 5. Remove the Jack Plate in the direction of arrow (B).
Jack Plate
Deck Shield Plate
2 1
Syscon PCB (B)
2 5 5 1 1
2
(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: (CP1001, CP1002, CP4001, CP4002 and CP4003). 3. Remove the Deck Chassis and Shield Cover Deck in the direction of arrow.
1
Deck Holder
Fig. 1-7
1
1
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. Extend the 2 supports 1. 2. Slide the 2 supports 2 and remove the Top Bracket. NOTE 1. After the installation of the Top Bracket, bend the support 1 so that the Top Bracket is fixed.
Locker R Top Bracket Cassette Side R Check if these positions are locked.
NOTE 1. In case of the Locker R installation, check if the two positions of Fig.2-3-B are correctly locked. 2. When you install the Cassette Side R, be sure to move the Locker R after installing.
1
1
Top Bracket
2
Fig. 2-3-B
2
Main Chassis
2-4: LINK UNIT (Refer to Fig. 2-4)
Main Chassis
Fig. 2-1 2-2: CASSETTE HOLDER ASS'Y (Refer to Fig. 2-2) 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.
Cassette Side R Main Chassis Locker R
1. Set the Link Unit to the Eject position. 2. Unlock the support 1. 3. Remove the (A) side of the Link Unit first, then remove the (B) side.
Main Chassis
Link Unit
(A)
(B) Link Unit
1
Main Chassis
Fig. 2-4
Link Ass'y Cassette Side L Main Chassis
2-5: LINK LEVER/FLAP LEVER (Refer to Fig. 2-5) 1. Extend the support 1. 2. Remove the Link Lever. 3. Remove the Flap Lever.
Fig. 2-2 2-3: CASSETTE SIDE L/R (Refer to Fig. 2-3-A) 1. Remove the Locker Spring. 2. Unlock the 4 supports 1 and then remove the Cassette Side L/R. 3. Unlock the support 2 and then remove the Locker R.
Flap Lever Locker Spring
1
1 1 2
Cassette Holder Link Lever
Locker R
Fig. 2-5
1 1
Cassette Side R
Cassette Side L
Fig. 2-3-A B2-1
DISASSEMBLY INSTRUCTIONS
2-6: LOADING MOTOR/WORM (Refer to Fig. 2-6-A) 1. Remove the screw 1. 2. Remove the Loading Motor. 3. Remove the Worm.
Tension Arm Ass'y
Loading Motor
Fig. 2-7-A
1
Worm Main Chassis
Tension Connect
1 3
Tension Band
Tension Spring Tension Holder · Screw Torque: 3 ± 0.5kgf·cm
Tension Arm Ass'y
1
Fig. 2-6-A
2 4
NOTE 1. In case of the Worm installation, check if the value of the Fig. 2-6-B is correct. 2. Incase of the Loading Motor installation, hook the wire on the Cassette Opener as shown Fig. 2-6-C. Fig. 2-7-B
19.2 ± 0.1mm
NOTE 1. In case of the Tension Band installation, note the direction of the installation. (Refer to Fig. 2-7-C) 2. In case of the Tension Band installation, install correctly as Fig. 2-7-D. 3. In case of the Tension Connect installation, install as the circled section of Fig. 2-7-E.
Safety surface for pressing of the insert.
Fig. 2-6-B
Tension Band Tension Connect
Fig. 2-7-C
Loading Motor
[OK]
Cassette Opener
Tension Connect Tension Band Tension Connect Tension Band
[NG] Fig. 2-6-C 2-7: TENSION ASS'Y (Refer to Fig. 2-7-B) 1. Turn the Pinch Roller Cam clockwise so that the Tension Holder hook is set to the position of Fig. 2-7-A to move the Tension Arm Ass'y. 2. Remove the Tension Spring. 3. Unlock the 2 supports 1 and remove the Tension Band. 4. Unlock the support 2 and remove the Tension Arm Ass'y. 5. Unlock the support 3 and remove the Tension Connect. 6. Float the hook 4 and turn it clockwise then remove the Tension Holder.
Fig. 2-7-D
Tension Connect
Main Chassis
Fig. 2-7-E
B2-2
DISASSEMBLY INSTRUCTIONS
2-8: T BRAKE ARM/T BRAKE BAND (Refer to Fig. 2-8-A) 1. Remove the T Brake Spring. 2. Turn the T Brake Arm clockwise and bend the hook section to remove it. 3. Unlock the 2 supports 1 and remove the T Brake Band.
T Brake Band Idler Gear Idler Arm Ass'y (B) S Reel
(A)
T Reel
Hook section
1
T Brake Arm T Brake Spring (A)
1 1
1
Fig. 2-8-A NOTE 1. In case of the T Brake Band installation, install correctly as Fig. 2-8-B. [OK]
T Brake Band T Brake Arm
Fig. 2-9-A NOTE 1. In case of the S Reel and T Reel installation, check if the correct parts are installed. (Refer to Fig. 2-9-B) 2. In case of the Idler Arm Ass'y installation, install correctly as Fig. 2-9-C. And also set it so that the section "B" of Fig. 2-9-A is placed under the Main Chassis tab.
[NG]
T Brake Band
T Brake Arm
Fig. 2-8-B 2-9: S REEL/T REEL/IDLER ARM ASS'Y/IDLER GEAR (Refer to Fig. 2-9-A) 1. Remove the S Reel and T Reel. 2. Remove the 2 Polyslider Washers 1. 3. Remove the Idler Arm Ass'y and Idler Gear. NOTE 1. Take care not to damage the gears of the S Reel and T Reel. 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. (Use gloves.) (Refer to Fig. 2-9-A) Do not adhere the stains on it. 5. When you install the reel, clean the shaft and grease it (FG-84M). (If you do not grease, noise may be heard in FF/REW mode.) 6. After installing the reel, adjust the height of the reel. (Refer to MECHANICAL ADJUSTMENT) [NG]
Idler Arm Ass'y Clutch Gear Big Hole (S Reel) Small Hole (T Reel)
Fig. 2-9-B
[OK]
Clutch Gear Idler Arm Ass'y
Fig. 2-9-C
B2-3
DISASSEMBLY INSTRUCTIONS
2-10: CASSETTE OPENER/PINCH ROLLER BLOCK/ P5 ARM ASS'Y (Refer to Fig. 2-10-A) 1. Unlock the support 1 and remove the Cassette Opener. 2. Remove the Pinch Roller Block and P5 Arm Ass'y.
1
Cassette Opener
Spring Position
Fig. 2-11-B
Pinch Roller Block
2-12: FE HEAD (RECORDER ONLY) (Refer to Fig. 2-12) 1. Remove the screw 1. 2. Remove the FE Head.
P5 Arm Ass'y
1
Main Chassis FE Head
Fig. 2-10-A NOTE 1. Do not touch the Pinch Roller. (Use gloves.) 2. In case of the Pinch Roller Block and the Pinch Roller Cam installation, install correctly as Fig. 2-10-B.
Can be seen the hole of the Pinch Roller Cam. · Screw Torque: 5 ± 0.5kgf·cm · The FE Head is not installed on the Video Cassette Player.
Pinch Roller Block
Fig. 2-12
P5 Arm Ass'y
2-13: AHC ASS'Y/CYLINDER UNIT ASS'Y (Refer to Fig. 2-13) 1. Unlock the support 1 and remove the AHC Ass'y. 2. Disconnect the following connector: (CD2001) 3. Remove the 3 screws 2. 4. Remove the Cylinder Unit Ass'y. NOTE 1. 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.
Can be seen the hole of the Main Cam.
Fig. 2-10-B 2-11: A/C HEAD (Refer to Fig. 2-11-A) 1. 2. 3. 4. Remove the screw 1. Remove the A/C Head Base. Remove the 3 screws 2. 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. 2-11-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) Cylinder Unit Ass'y
AHC Ass'y
1
2 2
(2)
2
A/C Head (2) (1)
(3)
2 2
2
A/C Head Spring · Screw Torque: 3 ± 0.5kgf·cm
Fig. 2-13
1
A/C Head Base · Screw Torque: 5 ± 0.5kgf·cm (Screw 1)
Fig. 2-11-A
B2-4
DISASSEMBLY INSTRUCTIONS
2-14: CAPSTAN DD UNIT (Refer to Fig. 2-14) 1. Remove the Capstan Belt. 2. Remove the 3 screws 1. 3. Remove the Capstan DD Unit. 2-15: MAIN CAM/PINCH ROLLER CAM/JOINT GEAR (Refer to Fig. 2-15-A) 1. Remove the E-Ring 1, then remove the Main Cam. 2. Remove the E-Ring 2, then remove the Pinch Roller Cam and Joint Gear.
1
Capstan Belt Capstan DD Unit Main Cam
2
Pinch Roller Cam
Joint Gear
1
· Screw Torque: 4 ± 0.5kgf·cm
Fig. 2-15-A
1 1
Fig. 2-14
NOTE 1. In case of the Pinch Roller Cam and Main Cam installation, install them as the circled section of Fig. 215-B so that the each markers are met. (Refer to Fig. 2-15-B)
NOTE 1. In case of the Capstan DD Unit installation, apply the silicon bond (TSE3843-W) on the position Fig. 2-14-B correctly. (If no silicon bond applied, abnormal noise will be heard on the deck operation.) (Refer to Fig. 2-14-B, C)
Applied position of silicon bond
Pinch Roller Cam
Marker
Be careful not to apply the silicon bond to the Pinch Roller.
Main Cam
Fig. 2-15-B Fig. 2-14-B 2-16: LOADING GEAR S/T UNIT (Refer to Fig. 2-16-A) 1. Remove the E-Ring 1 and remove the Main Loading Gear. 2. Remove the Main Rod, Tension Lever, Loading Arm S Unit and Loading Arm T Unit.
Silicon Bond Main Chassis Main Rod
1
Main Loading Gear
Loading Arm T Unit Tension Lever Capstan DD Unit
Fig. 2-14-C
Loading Arm S Unit
Fig. 2-16-A B2-5
DISASSEMBLY INSTRUCTIONS
NOTE 1. When you install the Loading Arm S Unit, Loading Arm T Unit and Main Loading Gear, align each marker. (Refer to Fig. 2-16-B)
Marker
2-18: CASSETTE GUIDE POST/INCLINED BASE S/T UNIT/P4 CAP (Refer to Fig. 2-18-A) 1. Remove the P4 Cap. 2. Unlock the support 1 and remove the Cassette Guide Post. 3. Remove the Inclined Base S Unit and Inclined Base T Unit.
Cassette Guide Post
Main Loading Gear Marker
1
Inclined Base S Unit
Inclined Base T Unit
Loading Arm T Unit
Loading Arm S Unit
P4 Cap
Fig. 2-16-B 2-17: CLUTCH ASS'Y/RING SPRING/CLUTCH LEVER/ CLUTCH GEAR (Refer to Fig. 2-17-A) 1. 2. 3. 4. Remove the Polyslider Washer 1. Remove the Clutch Ass'y and Ring Spring. Remove the Clutch Lever. Remove the Coupling Gear, Coupling Spring and Clutch Gear.
1
Fig. 2-18-A NOTE 1. Do not touch the roller of Guide Roller. 2. In case of the P4 Cap installation, install it with parallel for "A" and "B" of Fig. 2-18-B. 3. In case of the Cassette Guide Post installation, install correctly as the circled section of Fig. 2-18-C.
"A" "B"
Clutch Ass'y
Ring Spring Coupling Gear Coupling Spring Clutch Gear
Clutch Lever
P4 Cap
Cassette Opener
Fig. 2-17-A NOTE 1. In case of the Clutch Ass'y installation, install it with inserting the spring of the Clutch Ass'y into the dent of the Coupling Gear. (Refer to Fig. 2-17-B) [OK]
Cassette Guide Post
Fig. 2-18-B
Clutch Ass'y
[NG]
Cassette Guide Post
Coupling Gear
Fig. 2-17-B B2-6
Fig. 2-18-C
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. 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
GND on the CRT
Fig. 3-3 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
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 Fig. 3-4
CRT Support Fig. 3-2
B3-1
DISASSEMBLY INSTRUCTIONS
4. Insert one end of the Anode Support into the anode button, then the other as shown in Fig. 3-5.
CRT
Support Fig. 3-5
5. Confirm that the Support is securely connected. 6. Put on the Rubber Cap without moving any parts.
4. REMOVAL OF DEFLECTION YOKE
(Refer to Fig. 4-1) 1. Loosen the screw 1. 2. Remove the Convergence · Purity Magnet in the direction of arrow (A). 3. Remove the 3 Wedges. 4. Remove the Deflection Yoke in the direction of arrow. INSTALLATION Install new Deflection Yoke in reverse steps of REMOVAL. NOTE After adjusting the purity and the convergence, fix the screw 2 and lock the wedges.
Wedge
(B) (A)
1
Convergence · Purity Magnet Deflection Yoke Wedge Fig. 4-1
B3-2
DISASSEMBLY INSTRUCTIONS
5. REMOVAL AND INSTALLATION OF FLAT PACKAGE IC
REMOVAL 1. Put the Masking Tape (cotton tape) around the Flat Package IC to protect other parts from any damage. (Refer to Fig. 5-1.) NOTE Masking is carried out on all the parts located within 10 mm distance from IC leads.
Blower type IC desoldering machine
3. When IC starts moving back and forth easily after desoldering completely, pickup the corner of the IC using a tweezers and remove the IC by moving with the IC desoldering machine. (Refer to Fig. 5-3.) NOTE Some ICs on the PCB are affixed with glue, so be careful not to break or damage the foil of each IC leads or solder lands under the IC when removing it.
Masking Tape (Cotton Tape)
IC
Tweezers
Fig. 5-1
IC
2. Heat the IC leads using a blower type IC desoldering machine. (Refer to Fig. 5-2.) NOTE Do not add the rotating and the back and forth directions force on the IC, until IC can move back and forth easily after desoldering the IC leads completely. 4. Peel off the Masking Tape.
Fig. 5-3
5. Absorb the solder left on the pattern using the Braided Shield Wire. (Refer to Fig. 5-4.) NOTE Do not move the Braided Shield Wire in the vertical direction towards the IC pattern.
Blower type IC desoldering machine
Braided Shield Wire
Soldering Iron
IC
Fig. 5-2
IC pattern
Fig. 5-4
B4-1
DISASSEMBLY INSTRUCTIONS
INSTALLATION 1. Take care of the polarity of new IC and then install the new IC fitting on the printed circuit pattern. Then solder each lead on the diagonal positions of IC temporarily. (Refer to Fig. 5-5.) 4. When bridge-soldering between terminals and/or the soldering amount are not enough, resolder using a Thintip Soldering Iron. (Refer to Fig. 5-8.)
Thin-tip Soldering Iron
IC
Soldering Iron
Fig. 5-8 5. Finally, confirm the soldering status on four sides of the IC using a magnifying glass. Confirm that no abnormality is found on the soldering position and installation position of the parts around the IC. If some abnormality is found, correct by resoldering. NOTE When the IC leads are bent during soldering and/or repairing, do not repair the bending of leads. If the bending of leads are repaired, the pattern may be damaged. So, be always sure to replace the IC in this case.
Solder temporarily
Solder temporarily
Fig. 5-5 2. Supply the solder from the upper position of IC leads sliding to the lower position of the IC leads. (Refer to Fig. 5-6.)
Solder
Soldering Iron
IC
Supply soldering from upper position to lower position
Fig. 5-6 3. Absorb the solder left on the lead using the Braided Shield Wire. (Refer to Fig. 5-7.) NOTE Do not absorb the solder to excess.
Soldering Iron IC
Braided Shield Wire
Fig. 5-7
B4-2
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 30 minutes 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. If you set a factory initialization, the memories are reset such as the clock setting, the channel setting, the POWER ON total hours, and PLAY/REC total hours. 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 than 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 HOURS USED). Can be checked of the INITIAL DATA of MEMORY IC. Refer to the "WHEN REPLACING EEPROM (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 BOT, EOT, and the Reel Sensor do not work and the deck can be operated without a cassette tape. Refer to the "PREPARATION FOR SERVICING"
C2-1
PREVENTIVE CHECKS AND SERVICE INTERVALS
The following standard table depends on environmental conditions and usage. Parts replacing time does not mean the life span for individual parts. Also, long term storage or misuse may cause transformation and aging of rubber parts. The following list means standard hours, so the checking hours depends on the conditions. Time Parts Name Audio Control Head Full Erase Head (Recorder only) Capstan Belt Pinch Roller Capstan DD Unit Loading Motor Tension Band T Brake Band Clutch Ass'y Idler Arm Ass'y Capstan Shaft Tape Running Guide Post Cylinder Unit : Clean : Check it and if necessary, replace it. 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
2,500 hours
Notes
CONFIRMATION OF HOURS USED
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: If you set a factory initialization, the total hours is reset to "0". 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. 1. Set the VOLUME to minimum. 2. Press both VOL. DOWN button on the set and the Channel button (6) on the 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 Clean the Audio Control Head with the cotton stick soaked by alcohol. 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
WHEN REPLACING EEPROM (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.
INI 00 10 20 30 40 50 60 +0 88 AB 06 30 47 57 67 +1 0A 94 2A 31 48 58 67 +2 E2 91 01 33 49 59 68 +3 63 86 17 35 4A 5A 68 +4 43 00 10 37 4B 5B 69 +5 14 00 60 39 4C 5C 69 +6 34 00 32 3B 4D 5D 6A +7 0B 05 3A 3D 4E 5E 6A +8 51 08 BA 3F 4F 5F 6B +9 3A 00 D7 40 50 60 6B +A 10 AC 18 41 51 61 +B 66 0F 1D 42 52 62 +C 00 A5 28 43 53 63 +D 40 3E 2D 44 54 64 +E 00 0A 2E 45 55 65 +F 29 0C 2F 46 56 66
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 for more than 2 seconds. ADDRESS and DATA should appear as FIG 1.
ADDRESS DATA
INIT
00
83
POWER ON 0010 PLAY/REC 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 heads model) VHS Alignment Tape JG001 (VN 2 S-LI6 3 ) JG001A (VN 2 S-CO13 ) JG001Q (VN 2 S-LI6 3 H) JG001T (VN 2 S-X6 3 ) (For 4 heads model) VHS Alignment Tape JG001B (VN 1 S-LI6 3 ) JG001I (VN 1 S-CO13 ) JG001P (VN 1 S-LI6 3 H) 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
JG162D Cable (11 Pins) JG162E Cable (12 Pins) JG162Y Cable (5 Pins)
Tentelometer
Ref. No. JG001 JG001A JG001Q JG001T JG001B JG001I JG001P JG001S JG002B JG002E JG002F JG005 JG153 JG022 JG024A JG100A JG154 JG162D JG162E JG162Y
Part No. APJG001000 APJG001A00 APJG001Q00 APJG001T00 APJG001B00 APJG001I00 APJG001P00 APJG001S00 APJG002B00 APJG002E00 APJG002F00 APJG005000 APJG153000 APJG022000 APJG024A00 APJG100A00 APJG154000 APJG162D00 APJG162E00 APJG162Y00
Parts Name VHS Alignment Tape (For 2 heads model) VHS Alignment Tape (For 2 heads model) VHS Alignment Tape (For 2 heads model) VHS Alignment Tape (For 2 heads model) VHS Alignment Tape (For 4 heads model) VHS Alignment Tape (For 4 heads model) VHS Alignment Tape (For 4 heads model) VHS Alignment Tape (For 4 heads model) Adapter Dial Torque Gauge (10~90gf·cm) Dial Torque Gauge (60~600gf·cm) Post Adjustment Screwdriver X Value Adjustment Screwdriver Master Plane Reel Disk Height Adjustment Jig Torque Tape (VHT-063) Cable Cable (11 Pins) Cable (12 Pins) Cable (5 Pins) Monoscope, 6KHz Color Bar, 1KHz Hi-Fi Audio X Value Adjustment Monoscope, 6KHz Color Bar, 1KHz Hi-Fi Audio X Value Adjustment
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 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 Main PCB Used to connect the Syscon PCB and CRT PCB
D1-1
PREPARATION FOR SERVICING
How to use the Servicing Fixture 1. Unplug the connector CP353, CP502, CP820 and CP850, then remove the VCR Block from the set. 2. Connect as shown in the below figure using the Service Fixture. · Connect the Syscon PCB to the Main PCB with the cable JG162D and JG162E. · Connect the Syscon PCB to the CRT PCB with the cable JG162Y. 3. Short circuit between TP1001 and Ground with the cable JG154. (Refer to MAJOR COMPONENTS LOCATION GUIDE) (The BOT, EOT, and the Reel Sensor do not work and the deck can be operated without a cassette tape.) 4. In case of using a cassette tape, press the STOP/EJECT button to insert or eject a cassette tape. Turn on the power and re-check the cable before checking the trouble points.
Front Cabinet CRT PCB CP850 CP502
JG162E JG162Y CD601 CD850 JG162D Syscon PCB CD810 JG154 TP1001 CP820 Main PCB
To Ground
D1-2
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.) 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. While turning the reel and confirm the following points. Check if the surface "A" of reel disk is lower than the surface "B" of reel disk height adjustment jig (JG024A) and is higher than the surface "C". If it is not passed, place the height adjustment washers and adjust to 10(+2, -0)mm. 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 adjusting section for the Tension Arm position so that the Tension Arm top is within the standard line of Main Chassis. 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)
Fig. 1-2-A
Adjusting section for the Tension Arm position
Reel Disk Height Adjustment Jig (JG024A)
Tension Band
The Tension Arm top will move to the inside direction of the Main Chassis. Bend
The Tension Arm top will move to the outside direction of the Main Chassis.
Fig. 1-2-B
Fig. 1-1-A
Reel Disk Height Adjustment Jig (JG024A)
1-3: CONFIRMATION OF PLAYBACK TORQUE AND BACK TENSION TORQUE DURING PLAYBACK 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 50~90gf·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
Fig. 1-1-B
Video Tape
P1 Post
Guide Roller
Fig. 1-3
D2-1
MECHANICAL ADJUSTMENTS
1-4: CONFIRMATION OF VSR TORQUE 1. Install the Torque Gauge (JG002F) and Adapter (JG002B) on the S Reel. Set to the Picture Search (Rewind) mode. (Refer to Fig.1-4-B) 2. 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-B) 1. Once set to the Fast Forward mode then set to the Stop mode. While, unplug the AC cord when the Pinch Roller Block is on the position of Fig. 1-4-A. 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 60~100gf·cm. (T Reel Brake) (Refer to Fig. 1-4-B) 1. Once set to the Fast Forward mode then set to the Stop mode. While, unplug the AC cord when the Pinch Roller Block is on the position of Fig. 1-4-A. 2. Move the Idler Ass'y from the T Reel. 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 30~50gf·cm.
The position at FF mode. Pinch Roller Block Stop at this position.
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 S Reel side: S Reel/Tension Band/Tension Connect/Tension Arm Ass'y T Reel side: T Reel/T Brake Band//T Brake Spring/T Brake Arm
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 begin to decrease when you press the Tracking Button). 7. Adjust the PG shifter during playback. (Refer to the ELECTRICAL ADJUSTMENTS) NOTE
The position at STOP mode. Capstan DD Unit
Cassette Opener
Cassette Holder Ass'y
Fig. 1-4-A
Torque Gauge/Adapter (JG002F/JG002B)
After adjustment, confirm and adjust A/C head. (Refer to item 2-2)
CH-1 Envelope (TP4001)
Torque Gauge/Adapter (JG002E/JG002B) CH-2 SW Pulse (TP1002)
CH-1 Track
CH-2 Track
Fig. 2-1-A
Entrance S Reel Max Max Exit
A
B
T Reel
Fig. 1-4-B
A:B3:2
Fig. 2-1-B
D2-2
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 (1) CH-3 Audio (2) Envelope
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. 2-3.
Fig. 2-3
Stamp Mark
Fig. 2-2-A
2-4: CONFIRM HI-FI AUDIO (Hi-Fi model only) 1. Connect CH-1 of the oscilloscope to TP1002 and CH-2 to the Hi-Fi Audio Out Jack. 2. Playback the VHS Alignment Tape (JG001P or JG001Q). (Refer to SERVICING FIXTURE AND TOOLS) 3. Press and hold the Tracking-Auto button on the remote control more than 2 seconds to set tracking to center. 4. Press the Tracking Up button and count number of steps which the audio output is changed from Hi-Fi (10KHz) to MONO (6KHz). 5. Press and hold the Tracking-Auto button on the remote control more than 2 seconds to set tracking to center. 6. Press the Tracking Down button and count number of steps which the audio output is changed from Hi-Fi (10KHz) to MONO (6KHz). 7. If the difference are more than 3 steps, set the X Value adjustment driver (JG153) to 4 of Fig. 2-2-B. Change the X Value and adjust it so that the value becomes within 2 steps.
Audio/Control Head
3
1
2 4
Fig. 2-2-B
Audio/Control Head Tape
0.25±0.05mm
Fig. 2-2-C
D2-3
MECHANICAL ADJUSTMENTS
3. MECHANISM ADJUSTMENT PARTS LOCATION GUIDE
4 5
6 3
2
7
1
10
9
8
1. Tension Connect 2. Tension Arm 3. Guide Roller 4. Audio/Control Head 5. X value adjustment driver hole
6. 7. 8. 9. 10.
P4 Post T Brake Spring T Reel S Reel Adjusting section for the Tension Arm position
D2-4
ELECTRICAL ADJUSTMENTS
1. BEFORE MAKING ELECTRICAL ADJUSTMENTS
Read and perform these adjustments when repairing the circuits or replacing electrical parts or PCB assemblies. CAUTION · Use an isolation transformer when performing any service on this chassis. · Before removing the anode cap, discharge electricity because it contains high voltage. · When removing a PCB or related component, after unfastening or changing a wire, be sure to put the wire back in its original position. · When you exchange IC and Transistor for a heat sink, apply the silicon grease (YG6260M) on the contact section of the heat sink. Before applying new silicon grease, remove all the old silicon grease. (Old grease may cause damages to the IC and Transistor.) On-Screen Display Adjustment 1. Unplug the AC plug for more than 30 minutes 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 for more than 2 seconds to display adjustment mode on the screen as shown in Fig. 1-1.
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.
CH-2
TV
6.5H CH-1
Fig. 2-1-A 00 OSD 15 Fig. 1-1
CH-2
3. Use the Channel UP/DOWN button or Channel button (0-9) on the remote control to select the options shown in Fig. 1-2. 4. Press the MENU button on the remote control to end the adjustments. NO. 00 01 02 03 04 05 06 07 08 09 10 11 12 FUNCTION OSD H CUT OFF RF AGC VIF VCO H VCO H PHASE V SIZE V SHIFT R DRIVE B DRIVE R CUT OFF G CUT OFF B CUT OFF NO. 13 14 15 16 17 18 19 20 21 22 23 24 FUNCTION BRIGHTNESS CONTRAST COLOR TINT SHARPNESS FM LEVEL LEVEL SEPARATION 1 SEPARATION 2 TEST MONO TEST STEREO X-RAY TEST Fig. 1-2
CH-1 6.5H
Fig. 2-1-B 2-2: RF AGC 1. Receive the monoscope pattern. 2. Connect the digital voltmeter between the pin 5 of CP602 and the pin 1 (GND) of CP602. 3. Activate the adjustment mode display of Fig. 1-1 and press the channel button (02) on the remote control to select "RF AGC". 4. Press the VOL. UP/DOWN button on the remote control until the digital voltmeter is 2.9 ± 0.05V.
D3-1
ELECTRICAL ADJUSTMENTS
2-3: VCO FREERUN 1. Place the set with Aging Test for more than 10 minutes. 2. Connect the digital voltmeter between the pin 7 and pin 1 of CP602. 3. Activate the adjustment mode display of Fig. 1-1 and press the channel button (03) on the remote control to select "VIF VCO". 4. Press the VOL. UP/DOWN button on the remote control until the digital voltmeter is 2.5 ± 0.5V. 2-8: SUB BRIGHTNESS 1. Receive the black pattern. (RF Input) 2. Using the remote control, set the brightness, contranst, color and tint to normal position. 3. Activate the adjustment mode display of Fig. 1-1 and press the channel button (13) on the remote control to select "BRIGHTNESS". 4. Press the VOL. UP/DOWN button on the remote control until the screen begin to shine. 5. Receive the black pattern. (Audio Video Input) 6. Press the INPUT SELECT button on the remote control to set to the AV mode. Then perform the above adjustment 2~4. 2-9: SUB TINT 1. Receive the color bar pattern. (RF Input) 2. Connect the oscilloscope to TP803. 3. Using the remote control, set the brightness, contranst, color and tint to normal position. 4. Activate the adjustment mode display of Fig. 1-1 and press the channel button (16) on the remote control to select "TINT". 5. Press the VOL. UP/DOWN button on the remote control until the section "A" becomes a straight line (Refer to Fig. 2-2.) 6. Receive the color bar pattern. (Audio Video Input) 7. Press the INPUT SELECT button on the remote control to set to the AV mode. Then perform the above adjustments 2~5.
(TV SECTION)
2-4: CONSTANT VOLTAGE 1. 2. 3. 4. 5. Input DC12V to DC Jack and turn the Power ON. Connect the digital voltmeter to the F502 and GND. Set condition is AV MODE without signal. Adjust the VR501 until the DC voltage is 101 ± 0.5V. Input AC120V to AC cord and remove the DC Jack cord. Check if the Power is ON before doing the above procedure. 6. Adjust the VR502 until the AC voltage is 102 ± 0.5V. 2-5: CUT OFF 1. Adjust the unit to the following settings. R.DRIVE=64, B.DRIVE=64, R.CUT OFF=128, G.CUT OFF=128, B.CUT OFF=128, SUB BRIGHT=128, SUB CONTRAST=96. 2. Place the set with Aging Test for more than 15 minutes. 3. Set condition is AV MODE without signal. 4. Activate the adjustment mode display of Fig. 1-1 and press the channel button (01) on the remote control to select "CUT OFF". 5. Adjust the Screen Volume until a dim raster is obtained. 2-6: FOCUS 1. Receive the monoscope pattern. 2. Turn the Focus Volume fully counterclockwise once. 3. Adjust the Focus Volume until picture is distinct.
"A" 2-7: 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 (10) on the remote control to select "R.BIAS". 5. Using the VOL. UP/DOWN button on the remote control, adjust the R.BIAS. 6. Press the CH. UP/DOWN button on the remote control to select the "R.DRIVE", "B.DRIVE", "G.BIAS" or "B.BIAS". 7. Using the VOL. UP/DOWN button on the remote control, adjust the R.DRIVE, B.DRIVE, G.BIAS or B.BIAS. 8. Perform the above adjustments 6 and 7 until the white color is looked like a white. Fig. 2-2
D3-2
ELECTRICAL ADJUSTMENTS
2-10: SUB COLOR 1. Receive the color bar pattern. (RF Input) 2. Connect the oscilloscope to TP801. 3. Using the remote control, set the brightness, contranst, color and tint to normal position. 4. Activate the adjustment mode display of Fig. 1-1 and press the channel button (15) on the remote control to select "COLOR". 5. 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. 6. Press the VOL. UP/DOWN button on the remote control until the red color level is adjusted to 120 ± 10% of the white level. (Refer to Fig. 2-3) 7. Receive the color bar pattern. (Audio Video Input) 8. Press the INPUT SELECT button on the remote control to set to the AV mode. Then perform the above adjustments 2~6. 2-13: OSD HORIZONTAL 1. Activate the adjustment mode display of Fig. 1-1. 2. Press the VOL. UP/DOWN button on the remote control until the difference of A and B becomes minimum. (Refer to Fig. 2-4)
TV
00 OSD A
15 B
Fig. 2-4
0% 100%
2-14: SUB SHARPNESS 1. Activate the adjustment mode display of Fig. 1-1 and press the channel button (17) on the remote control to select "SHARPNESS". 2. Check if the step No. of SHARPNESS is "40". 3. Press the AV button on the remote control to set to the AV mode. Then perform the above adjustments 1, 2. 2-15: H VCO 120% 1. Activate the adjustment mode display of Fig. 1-1 and press the channel button (04) on the remote control to select "H VCO". 2. Check if the step No. of H VCO is "4". 2-16: VERTICAL SHIFT 1. Receive the monoscope pattern. 2. Activate the adjustment mode display of Fig. 1-1 and press the channel button (07) on the remote control to select "V SHIFT". 3. Adjust the VR402 until the horizontal line becomes fit to notch of the shadow mask. 2-17: VERTICAL SIZE 1. Receive the monoscope pattern. 2. Activate the adjustment mode display of Fig. 1-1 and press the channel button (06) on the remote control to select "V SIZE". 3. Press the VOL. UP/DOWN button on the remote control until the SHIFT quantity of the OVER SCAN on upside and downside becomes minimum. 4. Receive a broadcast and check if the pictrue is mormal.
Fig. 2-3 2-11: SUB CONTRAST 1. Receive the color bar pattern. (RF Input) 2. Activate the adjustment mode display of Fig. 1-1 and press the channel button (14) on the remote control to select "CONTRAST". 3. Press the VOL. UP/DOWN button on the remote control until the contrast step No. becomes "96". 4. Receive the color bar pattern. (Audio Video Input) 5. Press the INPUT SELECT button on the remote control to set to the AV mode. Then perform the above adjustments 2,3. 2-12: HORIZONTAL PHASE 1. Receive the monoscope pattern. 2. Activate the adjustment mode display of Fig. 1-1 and press the channel button (05) on the remote control to select "H PHASE". 3. Press the VOL. UP/DOWN button on the remote control until the SHIFT quantity of the OVER SCAN on right and left becomes minimum.
D3-3
ELECTRICAL ADJUSTMENTS
3. ELECTRICAL ADJUSTMENT PARTS LOCATION GUIDE (VCR SECTION)
TP4201 CP602
TU601
TP4001 TP1001 TP1002
SYSCON PCB
D3-4
ELECTRICAL ADJUSTMENTS
(TV SECTION)
FOCUS VOLUME SCREEN VOLUME
T502 VR502 FB401
VR501 T501 F502
VR402
MAIN PCB
TP801 TP803 J801
CRT PCB
D3-5
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 funnelside 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 the 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 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 movingthe 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