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Sharp VT-3428X Service Manual

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In the interests of user-safety (Required by safety regulations in some countries) the set should be
restored to its original condition and only parts identical to those specified should be used.
FEATURES
n
Timer Programme Setting by the On-Screen
Display
n
n
On-screen Display with Menu Screen Guidance
n
SPECIFICATIONS . . . . . . . . . . . . . . . . . . . . . . . .
IMPORTANT SERVICE NOTES . . . . . . . . . . . . .
CIRCUITRY . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
.
CIRCUITRY . . . . . . . . . . . . . . . . . . . . . . . . . . . .
. TROUBLESHOOTING . . . . . . . . . . . . . . . . . . .
chassis in this receiver
The
power receptacle, when servicing this chassis.
To prevent electric shock, do not remove cover. No user -
qualified service personnel.
SERVICE MANUAL
TV/VCR COMBINATION
MODELS
CONTENTS
Page
2
3
. . . . . . . . .
4
6
8
15
16
18
42
45
WARNING
is partially hot. Use an isolation transformer between the line cord plug and
SHARP CORPORATION
VIDEO TV
C h a s s i s N o . VP-3
n
n
System)
n
Full Auto Play Function
n
Auto Repeat Playback
n
Front input terminals Audio/Video
SCHEMATIC DIAGRAM . . . . . . . . . . . . . . . . .
SCHEMATIC DIAGRAM . . . . . . . . . . . . . . . . .
serviceable parts inside. Refer servicing to
Page
57
. . . . . . .
59
61
65
79
81
. . . . . .
91
97
105
. . . . . . . . . . . .
. . . . . . . . . . . . . . . . .
134

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Summary of Contents for Sharp VT-3428X

  • Page 1: Table Of Contents

    Use an isolation transformer between the line cord plug and power receptacle, when servicing this chassis. To prevent electric shock, do not remove cover. No user - serviceable parts inside. Refer servicing to qualified service personnel. SHARP CORPORATION...

  • Page 2: Specifications

    SPECIFICATIONS Model VHF : NZl - NZll Reception channels UHF : E21 - E69 VHF band UHF band PAL B/G Receiving System Screen 34 cm “Viewable” measured diagonally, 90’ deflection diagonally, 90” deflection Antenna input Max. 1.5 W Audio output 8 cm round type x 1 pc Speaker 1 Rated voltage...

  • Page 3: Important Service Notes

    IMPORTANT SERVICE NOTES and repair of this receiver should be done by Maintenance qualified service personnel only. SERVICING OF HIGH VOLTAGE SYSTEM AND PICTURE TUBE When servicing the high voltage system, remove static charge from it by connecting a 10 k ohm Resistor in series with an insulated wire (such as a test probe) between picture tube dag and 2nd anode lead.

  • Page 4: Location Of User's Control

    search) BUTTON STOP/EJECT search) BUTTON POWER MAIN POWER SWITCH (01) _J SENSOR ARE EA ’ VIDEO OUT JACK FOR REMOTE AUDIO OUT JACK CONTROL ANTENNA IN TERMINAL VIDEO INPUT JACK - AUDIO INPUT JACK - POWER/WAKE-UP TIMER INDICATOR VOLUME UP/DOWN BUTTONS CHANNEL UP/DOWN BUl-t-ONS NOTES: Use the RESET button if the...
  • Page 5 The remote control lets you operate this product at a distance. Just aim the front of the remote control at the photoreceptor window situated on the front panel and press the appropriate Inserting the Batteries The remote control operates on two R03 (AAA) 1.5 volt batteries (included).

  • Page 6: Disassembly And Reassembly

    DISASSEMBLY AND R’EASSEMBLY TV SECTION Remove the nine screws off the rear cover. (VT-3428X) Remove the ten screws off the rear cover. (VT-51 28X) Disconnect the F connector from the main PWB and G connector from the power PWB and disconnect the anode cap and the CRT PWB unit from the CRT.
  • Page 7 DISASSEMBLY AND REASSEMBLY (Continued) Remove the CRT PWB, degaussing coil connector G and front power switch remote control PWB. Place the main PWB upright. Reconnect the CRT PWB. Put the main PWB and the VCR unit together as shown below. Keep the front power switch remote control PWB, speakers and degaussing coil connector G off position.

  • Page 8: Adjustment Of The Tv Electrical

    ADJUSTMENT OF THE TV ELECTRICAL CIRCUITRY PRECAUTIONS POWER button ( bl ) of the set. Now the set is in the service mode. ROM No. in the microprocessor data (O-63,1 O-55,0-3, O- 1) *SERVICE MODE : 01 RED INT = O-63 *SERVICE MODE : 02 = O-63 *SERVICE MODE : 03...
  • Page 9 SCREEN/BACKGROUND ADJUSTMENT Adjusting Procedures Adjusting Conditions background off. Look at the VCJ IC data on the screen. Adjust the control so that the 10th figure from left should turn from “1 II to “0”. To be 0 here too. To turn to 0 here. Red intensity : PATTERN”...
  • Page 10 HORIZONTAL/VERTICAL CIRCUIT ADJUSTMENT Adjusting Conditions Normal position. Adjusting Procedures I. Call the service mode and take the steps below. Figure 1. Select the service mode number “4”. Adjust the Select the service mode number ‘5’. Adjust the Figs. 1 and 1.) Select the service mode number “6”.
  • Page 11 PURITY ADJUSTMENT Adjusting Conditions Before the warm up the set purity adjustment, with beam current of more than 700 ,uA for longer than 30 minutes (400 PA for the 14” model). beam current to about 770 @I (500 fi for the 14” model).
  • Page 12 CONVERGENCE ADJUSTMENT Adjusting Conditions This adjustment should be performed after the purity magnet adjustment. Figure b. Figure a. Adjusting Procedures STATIC CONVERGENCE ..I..* ..* ..I..‘. and rotate the magnet to impose the blue line over the red one.
  • Page 13 PERFORMANCE CHECK Adjusting Conditions / Procedures Adjusting Point modulation). The output levels are as follows. Video output: 1 Vp-p + 3 dB (0.71-l .41 Vp-p) Audio output: 2.61Vp-p + 3 dB (1.85-3.69 Vp-p) Note: Make sure the video and audio outputs are as specified. signals are being properly received.
  • Page 14 PERFORMANCE CHECK (Continued) Adjusting Conditions / Procedures Adjusting Point Blue background Make sure also that the audio is mute. Record index Note: Make sure the channel and time are recoded.

  • Page 15: Precautions In Reassembling

    PRECAUTIONS IN REASSEMBLING MOUNTING THE CASSETTE CONTROLLER before placing the cassette controller in the mechanism. The initial setting is Initial setting is indispensable made in two ways; electrical and mechanical. Electrical setting: Make a short-circuit between TP8804 and TP8805, both located at the center on your side on VCR PWB, with a 22 ohm resistor and be sure that the mechanism is back to its initial setting position (*l).

  • Page 16: Function Of Major Mechanicalaparts

    FUNCTION OF MAJOR MECHANICAL PARTS (TOPVIEW) Take-Up Pole A/C Head Ass’y Drum Ass’v m Base Ass’y Pinch Roller Lever Ass’y Full Erase Head Ass’y Pinch Drive Car Supply Pole Pinch Drive Base Ass’y Lever Ass’y Main Supply Reverse Guide Brake Lever Main Take-Up Tension Brake Lever...
  • Page 17 FUNCTION OF MAJOR MECHANICAL PARTS (BOTTOM VIEW) Loading Gear Capstan Reel Belt @, Slow Brake Lever 1 o- Master Cam @, Cassette Housing Drive Gear Connect Gear 5 o++ Clutch Gear @ Reel Pulley Function Function Reel pulley Slow brake lever Transmits the power of the capstan D.D.

  • Page 18: Adjustment, Replacementand Assembly Of Mechanical Parts

    ADJUSTMENT, REPLACEMENT AND ASSEMBLY OF MECHANICAL UNITS We are sure that the easy-to-handle tools listed below would be more than handy for periodical work in the field, not referring to the more maintenance to keep the machine in its original complicated repairs which would require the use of working condition.
  • Page 19 Remarks Configuration Jig Item Part No. Code This screwdriver is used for adjusting Special Bladed Screwdriver the guide roller height. This is used to screw down resin- Torque Driver made parts: the specified torque is 5 This Jig is used for height adjust- position.
  • Page 20 MECHANICAL PARTS REQUIRING PERIODICAL INSPECTION Possible symptom encountered Remarks Guide roller ass’y Abnormal rotation or significant vibration requires replacement. Supply impedance roller Clean with pure high Supply impedance roller Lateral noises quality isopropyl alcohol. (inner hole and shaft) Head occasionally blocked Supply impedance roller flange Clean tape contact part with the specified cleaning...
  • Page 21 REMOVAL AND REASSEMBLY OF CASSETTE HOUSING CONTROL ASSEMBLY Cassette control drive gear Removal Drive angle of eject mode. cassette control order. a) Remove the cassette housing installation screws 0 and a. Figure l-2. assembly upward. order. Notes: away from the A/C head, FE (Full Erase) head, or the drum.
  • Page 22 Notes: REPLACEMENT AND HEIGHT CHECKING @Take enough care not to deform the tension AND ADJUSTMENT OF REEL DISKS band during installation of the supply reel disk. Removal (Supply and Take-up reel disks) Reassembly (Take-up reel disk) main brake. take-up main brake. remove the reel disk.
  • Page 23 Check that the reel disk is lower than part A but Adjustment higher than part the capstan D.D. motor pulley, reel belt and reel readjust the reel disk height by changing the pulley with cleaning liquid, then recheck the torque. Note: Whenever replacing the reel disk, perform the the reel belt.
  • Page 24 CHECKING AND ADJUSTMENT OF TAKE-UP Adjustment TORQUE IN VIDEO SEARCH REVERSE torque is outside the range, clean MODE the capstan D.D. motor pulley, reel belt and reel pulley with-cleaning liquid, then recheck the Remove the cassette housing control assembly. torque. Make a short-circuit between TP8804 and the reel belt.
  • Page 25 CHECKING THE FAST FORWARD BACK disk, and turn it counterclockwise very slowly TENSION (one rotation every 2 to 3 seconds) and check Remove the cassette housing control assembly. that the torque is I .3 2 0.8mNem (I 3 + 8 Make a short-circuit between TP8804 and Note: @Set the torque gauge securely on the take-up...
  • Page 26 pole is in alignment with the line 0.2mm left of Tension gauge the center line of the SI roller. Readjust as required in the following steps. Tension pole Pinch rolle Capstan shaft Center line -+ Tension gauge adapter Figure l-1 7. Make the adjustonent with the beginning of a Figure l-1 5.
  • Page 27 Note: @The tension band positioning cam cannot be adjusted with a cassette in place because the cam will be located below the cassette. Repeat a series of steps; empty loading, adjustment, cassette placement and position checking. tension pole to the right (in the black-arrow direction).
  • Page 28 side CHECKING THE BRAKE TORQUE the brake torque at the take-up Checking the brake torque at the supply side , Supply reel disk Figure l-24. Figure l-25. Remove the cassette housing control assembly. Remove the cassette housing control assembly. Make a short-circuit between TP8804 and Make a short-circuit between TP8804 and on the VCR PWB, with a 22 ohm resistor.
  • Page 29 REPLACEMENT OF A/C (Audio/Control) H E A D unplug the power cord. adjusting nut Removal Figure l-28. head assembly. Notes: Adjustment adjustment of the tape drive train (see page 33). Set the mechanism to the loading mode. Under any circumstances, avoid touching the head.
  • Page 30 HEIGHT ADJUSTMENT OF REVERSE GUIDE [A/C head height rough adjustment] [Height adjustment of reverse guide] Setting Reverse guide height guide Reverse guide height adjusting jig Go-end is 13.52 mm. Not go-end is 13.38 mm Figure l-33. Remove open lever (Figure l-34. (a)) Figure l-30.
  • Page 31 ADJUSTMENT OF TAPE DRIVE TRAIN Remove the cassette housing control assembly. Make a short-circuit between TP8804 and on the VCR PWB, with a 22 ohm resister. Now turn on the power. Check and adjust the position of the tension pole. (See page 26.) Check and adjust the video search rewind back tension.
  • Page 32 Box driver Azimuth adjusting A/C head height screw adjusting screw Head switching pulse (TP202) Figure l-42. Figure l-41. Figure l-40. Adjustment of tape (VROUBZFS) drive train and X-Position. Connect an oscilloscope to the audio output Connect the oscilloscope to the test points terminal.
  • Page 33 Reassembly that a flat response is obtained on the chassis making sure not to allow the capstan envelope waveform. shaft to hit the mechanism chassis, and attach it with the three screws. guide roller setscrew in the unloading mode. board connector on the VCR PWB. to check that the envelope waveform does Notes : not change.
  • Page 34 ASSEMBLE THE MECHANISM’S PARTS REQUIRING THE PHASE MATCHING IN THE STEPS BELOW. Fit the point of the pinch drive cam to the fourth tooth of the pinch drive lever,and , Assembling the pinch roller assembly and the insert the pinch drive cam. pinch drive cam (on the front of the mechanism chassis).
  • Page 35 Ass’ y. Pinch Roller Pinch Double Action Lever Phase-Matting Point @ Figure l-48-2. Figure l-48-3.
  • Page 36 Make sure that the loading gear is at the the mechanism chassis) point 0 as shown below. the CD insertion points and the 6) relief points. on insert points 0 and 6). Capstan Phase-Matching Reel Pulley Point 0 (Bottom Side of mechanism chassis) Figure l-49.
  • Page 37 Note: the back See the figure below for the phase matching of the mechanism chassis). between the master cam and the cassette control drive gear. the point as shown below. below. E-ring (XRESJ40-06000) Master Cam Master Cam Figure l-51.
  • Page 38 Note: Let the slow brake leg out of the front of the brake and loading motor assemblies mechanism chassis. Catch the spring to the take- (on the back of the mechanism chassis). up fixing guide that is at the left of the A/C head. Brake Figure l-52.
  • Page 39 REPLACEMENT OF LOADING MOTOR Removal Remove 2 screws. Use the specific washers for an appropriate To press the motor in, receive it by portion A. Press-fit the loading motor pulley with a force of Figure l-53. less than 98N (10 kgf). Be sure that the pulley is Replacement replacement loading motor as shown above (Figure l-53.).
  • Page 40 ASSEMBLY OF CASSETTE HOUSING Apply grease Phase Matching Point Fix the drive angle ass’y to the drive gear Ras shown in the figure. Drive gear R...
  • Page 41 Stamp mechanism code Insert the jig shaft. Top surface should be free from scraches or soil. jig shaft. Align the drive gear’s round hole with the synchro gear’s triangular (A) symbol. Do this alignment for both the drive gears. Phase Matching Point Figure I-58.

  • Page 42: Adjustment Of The Vcr Electrical

    ADJUSTMENT OF THE . VCR ELECTRICAL CIRCUITRY Notes: Before the adjustment: Electrical adjustments discussed here are often required after replacement of electronic components and mechanical parts such as video heads. Check that the mechanism and all electric components are in good working condition prior to the adjustments, otherwise adjustments can not be completed.
  • Page 43 Test points layout of VCR Main Unit. 5 “REEL SENSMl Figure 2-2. Adjustment of PAL System LP still picture Adjustment of NTSC System EP still picture vertical jitter vertical jitter Measuring Measuring Monitor TV Monitor TV instrument instrument Mode Mode I Still picture playback Cassette I NTSC EP recording tape...
  • Page 44 Checking of audio playback level AC milli-voltmeter or Measuring (Use TP6602 for ground lead.) instrument Playback Mode Alignment tape.(VROCPSV) Input signal Checking of erase voltage and oscillation frequency Audio Out Test point (pin (11) of El connector) Measuring Oscilloscope instrument Specification Mode I Record...

  • Page 45: Troubleshooting

    OF VCR SECTION TROUBLESHOOTING ELECTRICAL CASSETTE CONTROL TROUBLESHOOTING VCR POWER TROUBLESHOOTING FLOW CHART NO. 11 FLOW CHART NO. l-l The VCR is dead. (No power) cassette tape Is not taken in. YES -,, Unplug the AC power cord. Replug Fix or replace the cassette Is the cassette housing distored 1 it a few minutes later.
  • Page 46 SYSTEM CONTROL TROUBLESHOOTING LOADING MOTOR AND EJECT TROUELESHOOTING FLOW CHART NO. 1-5 FLOW CHART NO. l-4 No power. A cassette tape falls to eject. Does the capstan motor start No See FLOW CHART NO. 1-6. when the EJECT button is pressed 7 Check IClOOl and lC8801.
  • Page 47 CAPSTAN MOTOR TROUBLESHOOT TAKE-UP REEL PULSE GENERATOR TROUBLESHOOTING FLOW CHART NO. 1-7 FLOW CHART NO. l-6 sensor pulse appears. The capstan motor fails to run. Insert the cassette, and Is the voltage more than about Check IC7701 and all the way up to pin (3) of IC8801.
  • Page 48 DRUM MOTOR TROUBLESHOOTING FLOW CHART NO. 1-9 The drum motor fails to run, Is the voltoge more than about Check IC7701 and all the way up to pin (4) of IC8801. Check between the ME connector Is the volta e more than about and IC770 1, and between the ME at pin (1) of ME socket and pin (62) of IC8801.
  • Page 49 FLOW CHART NO. 1-l 1 DRUM SERVO TROUBLESHOOTING Drum servo does not function. Is there 16MHz oscillation at ins (38) and C8811. and (39) of ICE801 ? Is the reference voltage In PB mode Is there the drum FG Is there the head Check the composite signal at pin (67) of switching pulse at pin...
  • Page 50 FLOW CHART NO. 1-12 CAPSTAN SERVO TROUBLESHOOTING Capstan servo does not function. Only REC mode inoperative. Only PB mode inoperative. Are REC and /or PB mode inoperative ? oscillation at oins (38) and (39) of I&801:! ’ Check X8801, C8810 and C8811.
  • Page 51 VCR RECORDING MODE (LUMINANCE)TROUBLESHOOTlNG VCR RECORDING MODE (CHROMA) TROUBLESHOOTlNG FLOW CHART NO. 1-14 FLOW CHART NO. 1-13 No record. Record Is In black and white ( E-E colour mode ). Are there YIC data and clock signals at pins (14) clock signals at pins (14) Check data and clock and (15) of IC2201...
  • Page 52 VCR PLAYBACK MODE (LUMINANCE) TROUBLESHOOTING VCR PLAYBACK MODE (CHROMA) TROUBLESHOOTING FLOW CHART NO. 1-15 FLOW CHART NO. 1-16 No Playback. Playback lsin black and white. Are there Y/C data and Are there Y/C data and clock signals at pins (14) and (15) of IC2201 when playback starts? Check the pin (2) of IC3301 is OV...
  • Page 53 VCR SOUND TROUBLESHOOTING VCR E - E MODE TROUBLESHOOTING FLOW CHART NO. l-18 FLOW CHART NO. l-17 No Sound No E- E signal. But audio REC is not Is there a signal at pin Check the harness from f AB J to f El J and input signal line. Is there an Audio Signal at pin (7) of Is there an Audio...
  • Page 54 TROUBLESHOOTING OF TV SECTION KEY-IN TROUBLESHOOTlNG TV TROUBLESHOOTlNG TABLE FLOW CHART NO.24 FLOW CHART NO. 2-l Key-in input for VCR is not received. Set not operating Is the key switch in good contact ? Check the switch contact. Is AC cord connected 7 Connect AC cord.
  • Page 55 Circuit to be checked: TV TROUBLESHOOTING TABLE FLOW CHART NO. 2-5 FLOW CHART NO. 2-4 NO PICTURE, NO SOUND NO RASTER Does the noise level increase at max, Contrast, Brightness, and Sound Control ? noise increases but no signal is received Normal Replace the Fuse Is there a signal at pin (8)
  • Page 56 NO VERTICAL SCAN FLOW CHART NO. 2-6 FLOW CHART N0.2-9 NO PLAYBACK SOUND Check the TV: TROUBLE SHOOTING ‘NO SOUND’. I Normal Circuits to be checked: Abnormal FLOW CHART NO. 2-10 check Normal FLOW CHART N0.2-7 NO SOUND Is the white balance properly adjusted ? Does waveform appear at , - -- - - - - - --‘ill!

  • Page 57: Overall Schematic Diagram

    OVERALL SCHEMATIC DIAGRAM VIDEO HEAD FULL ERASE HEAD AUDIO CONTROL HEAD I AJ LOADING MOTOR ‘ - I--- , - D R U M M O T O R UN11 DRUM MOTOR DRIVER...
  • Page 58 t i 1 DEFLECTION YOKE IONS WITH -...

  • Page 59: Chassis Layout Of Tv Section

    CHASSIS LAYOUT OF TV SECTION I C302 . - . I C402 VIDEO AUDIO...
  • Page 60 P O W E R...

  • Page 61: Block Diagram Of Tv Section

    BLOCK DIAGRAM OF TV SECTION --(H-SYNC R-Y. B-Y. AMP..( H-SYNC/H-FLY IN )-...
  • Page 62 AUDIO AMP. VIDEO AUDIO AMP. VIDEO SW. IF PACK I -----~--&-I...
  • Page 63 BLOCK DIAGRAM OF TV SECTION VIDEO OUTPUT CUT OFF POWER ERROR DETECT RELAY SW. PHOTO SW ON/OFF COUPLER POWER TR...
  • Page 64 V C R - K E Y P O W E R S W - R / C - --m---v POWER CONTROL START RECTIFIER ERROR AMP. LATCH.

  • Page 65: Description Of Tv Section Schematic Diagram

    DESCRIPTION OF TV SECTION SCHEMATIC DIAGRAM SAFETY NOTE: POTENTIAL SHOCK HAZARDS WHEN THE CHASSIS IS OPERATING. IMPORTANT SAFETY NOTICE: BE SURE TO USE GENUINE PARTS FOR SECURING THE SAFETY AND RELIABILITY OF THE SET. PARTS MARKED WITH “A y ( ) ARE IMPORTANT FOR MAlNTAlNING THE SAFETY OF THE SET.
  • Page 66 SOLID STATE DEVICE BASE DIAGRAM COLLECTOR...
  • Page 67 WAVEFORMS (VT-3428X) 1 A C : l.OVp-p 2 AC : 1.3 Vp-p 3 AC: 1.7Vp-p 4 AC: 1.7Vp-p 5 A C : 1.7 Vp-p DC : 5.0 V DC : 3.2 V DC : 3.2 V DC : 1.55 V DC : 1.55 V...
  • Page 68 WAVEFORMS (VT-51 28X) AC : 0.9 Vp-p 2 A C : 1.3Vp-p DC : 5.0 V DC : 3.2 V AC : 2.2 Vp-p I I I I I I I I I- AC : 950 Vp-p...
  • Page 69 MODEL VT-3428X SCHEMATIC DIAGRAM: Mother Unit...
  • Page 70 ii i...
  • Page 71 MODEL VT-3428X SCHEMATIC DIAGRAM: CRT Socket, Powe POWER M O T O R I I I...
  • Page 72 VCR-Key Power SW, R/C Unit NOTE:. I. THE UNIT’ OF RESISTOR TO PWB-A T O PWB-A - -W.-----o...
  • Page 73 MODEL VT-5128X SCHEMATIC DIAGRAM: Mother Unit EEPROM...
  • Page 75 MODEL VT-51 28X SCHEMATIC DIAGRAM: CRT Socket, Powe T O PWB-A (F) POWER TO PWB-A T O PWB-A...
  • Page 76 R/C Unit Power SW, ‘NOTE: I. THE UNIT OF RESISTOR V C R - K E Y T O PWB-A T O PWB-A...
  • Page 77 Infrared Remote Control Unit...
  • Page 78 IF-Pack Unit...

  • Page 79: Chassis Layout Of Vcr Section

    CHASSIS LAYOUT OF VCR SECTION VIDEO OUT E N D S E N S O R I’...
  • Page 80 I - - - - - - S T A R T SENSOR CASSETTE C A M S W A H E A D S W I T C H I N G T V REEL SENSOR POWER TIMER W A K E - V P C H I L D L O C K VOLUME...

  • Page 81: Block Diagram Of Vcrsection

    BLOCK DIAGRAM OF VCR SECTION - - - - - - I V I D E O 3 *ux.mDEo I -10...
  • Page 83 BLOCK DIAGRAM OF VCR SECTION r - - - - - - - - - - d...
  • Page 84 1 rl--'"...
  • Page 85 BLOCK DIAGRAM OF VCR SECTION - - - - - - - -...
  • Page 86 SAFETY DEVICE BLOCK DIAGRAM...
  • Page 87 M A D M A O PROCESS ‘CC B I A S...
  • Page 88 MANUAL SYSTEM IS SYSTEM CONTROLLER XC8801 A T SV AUTO SYSTEM IS TRANSFERED FROM V-SYNC. COMPOSITE SYNC. SEPARATOR GENERATOR EC +Jc CAP. FG SHAPER FROM CAPST A N MOTOR VIDEO AUDIO BLOCK AUTO SYSTEM SELECT FROM CTL HEAD...
  • Page 89 BLOCK DIAGRAM OF VCR SECTION...

  • Page 91: Description Of Vcr Section Schematic Diagram

    DESCRIPTION OF VCR SECTION SCHEMATIC DIAGRAM SAFETY NOTES: BEFORE REPLACING PARTS. AS POTENTIAL SHOCK HAZARDS WHEN CHASSIS IS OPERATING. NOTES: M = 1 Meg ohm). the values without parentheses are the ones in the REC mode. VOLTAGE MEASUREMENT CONDITIONS: chassis ground by VTVM, with AC220-240V, 50Hz supplied to unit and all controls are set to normal viewing picture unless otherwise noted.
  • Page 92 WAVEFORMS V : 600mVp-p V : 700mVp-p P In (38)ol XC2201 P In (63lot IC2201 P In (6l)ot XC2201 P In (20)ot IC2201 P In (27)oC XC2201 P In (10)of XC2201 H / A H / A S E R V O S E R V O SYSTEM Y / C...
  • Page 93 --SCHEMATIC DIAGRAM: VCR Unit-l T O S Y S T E M CONTROL.SERVOWCRI I...
  • Page 95 SCHEMATIC DIAGRAM: VCR Unit-2 VOLTAGE SW TIMER C H I L D LOI DRIVE LED DRIVE L E O DRIVl...
  • Page 96 CIRCUIT...

  • Page 97: Printed Wiring Board Assemblies

    PRINTED WIRING BOARD ASSEMBLIES...
  • Page 98 (Wiring Side)
  • Page 101 n VCR SECTION...
  • Page 103 l VCR SECTION...

  • Page 105: Replacement Parts List

    PARTS LIST PICTURE TUBE PARTS REPLACEMENT Replacement parts which have these special safety characteristics MODEL VT-3428X identified in this manual: electrical components having such fea- tures are identified by “A” in the Replacement Parts Lists. A DY601 RCiLH0057PEN3 The use of a substitute replacement part which does not have the...
  • Page 106 Description Code Ref. No. Part No. Description Code Part No. Ref. No. MAIN UNIT (Continued) A Q601 R 2SA1271-Y . D1008 VHDlSSllS//lE DIODES PACKAGED CIRCUITS COIL AND TRANSFORMERS...
  • Page 107 Ref. No. Part No. Description Code Ref. No. Part No. Description Code MAIN UNIT (Continued) Ceramic Ceramic Ceramic Ceramic CAPACITORS Ceramic Ceramic Mylar Ceramic Electrolytic Electrolytic Electrolytic Ceramic Electrolytic Ceramic Electrolytic Ceramic Ceramic Ceramic Mylar Ceramic Ceramic Electrolytic Electrolytic Electrolytic Electrolytic Electrolytic Electrolytic...
  • Page 108 Part No. Description Code Ref. No. Part No. Ref. No. Description Code Electrolytic AC MAIN UNIT (Continued) Electrolytic AB Electrolytic AC Ceramic Mylar Ceramic Ceramic Electrolytic AB Electrolytic AB Mylar Ceramic Mylar Mylar Electrolytic AB Mylar Ceramic Mylar Mylar 1 OOV Electrolytic AC Mylar Mylar Ceramic...
  • Page 109 Part No. Code Ref. No. Ref. No. Description Part No. Description Code MAIN UNIT (Continued) RESISTORS Carbon 1 i8W Carbon Carbon Carbon 1 i8W Carbon Carbon Carbon Carbon Carbon Carbon Carbon Carbon 1 i8W Carbon Metal Oxide A R320 Metal Oxide 1 t8W Carbon 1 t8W Carbon 1 t2W Carbon...
  • Page 110 Ref. No. Part No. Part No. Description Code Description Ref. No. MAIN UNIT (Continued) 1 t8W Carbon Cement Metal Oxide AC Metal Oxide AC M e t a l F i l m AB M e t a l F i l m AB 1 t2W Carbon 1 i4W Carbon 1 t2W Carbon...
  • Page 111 Part No. Description Code Ref. No. Part No. Ref. No. Description Code MAIN UNIT (Continued) 1 i8W Carbon MISCELLANEOUS PARTS...
  • Page 112 Part No. Description Code Ref. No. Part No. Ref. No. Description Code A D711 MAIN UNIT (Continued) A VA701 PACKAGED CIRCUITS POWER UNIT A PR701 INTEGRATED CIRCUITS A IC701 A L702 A IC702 A T701 TRANSISTORS A T701 CAPACITORS A C701 A C702 A C703 DIODES...
  • Page 113 Ref. No. Part No. Description Code Ref. No. Part No. Description Code A R725 A R726 Solid POWER UNIT (Continued) A R752 Metal Oxide AA Carbon Carbon Carbon Carbon Carbon Carbon Carbon 1 OOV Electrolytic Carbon Metal Oxide AD MISCELLANEOUS PARTS A F701 A FB701 RBLN-0037CEZZ A FB702 RBLN-0037CEZZ...
  • Page 114 Description Code Ref. No. Part No. Description Code Ref. No. Part No. CRT SOCKET UNIT TRANSISTORS Metal Oxide DIODES COIL MISCELLANEOUS PARTS CAPACITORS A SC851 QSOCV0829CEZZ R C R T S o c k e t A SC851 QSOCVO913CEZZ RESISTORS Metal Oxide...
  • Page 115 Ref. No. Part No. Description Code Ref. No. Part No. Description Code POWER SW., R/C UNIT VCR-KEY UNIT CAPACITOR RESISTORS RESISTOR MISCELLANEOUS PARTS MISCELLANEOUS PARTS...
  • Page 116 Description Code Ref. No. Part No. Description Ref. No. Part No. Code V Diode, lSS119 VCR UNIT V Diode, lSS119 V Diode, lSSn9 INTEGRATED CIRCUITS V LED, Power/Wake-up V HA118201CF V LED, REC V MN3883S-El V LED, Timer V STV5715 V LED, Child Lock M LA7285M V Diode, lSS119...
  • Page 117 I KESSX” Ref. No. Part No. Description Code Ref. No. Part No. Description Code Ceramic VCR UNIT (Continued) CONTROLS V 47k(B) B i a s Adj. V 47 . Point Ceramic V 47 Ceramic CAPACITORS Ceramic Ceramic V 27p V 0.01 Ceramic Ceramic V 47...
  • Page 118 Description Code Ref. No. Part No. Description Ref. No. Part No. V 2.2 VCR UNIT (Continued) V 22p Ceramic V 22p Ceramic V 1000~ 50V C e r a m i c Ceramic Ceramic v 0.1 Ceramic V 47 Ceramic Ceramic Ceramic Ceramic...
  • Page 119 Description Code Ref. No. Part No. Ref. No. Part No. Description Code See Controls VCR UNIT (Continued) V 150 1/16W Metal Oxide V 270k 1/16W Metal Oxide Carbon V 6.8k 1/16W Metal Oxide V 1 Ok 1/16W Metal Oxide AA Metal Oxide V 1 Ok l/l 6W Metal Oxide AA V 150 1/16W...
  • Page 120 Ref. No. Part No. Description Code Ref. No. Part No. Description Code V 15k ll8W Carbon VCR UNIT (Continued) V 220 ll8W Carbon V 150k 1/16W Metal Oxide AA V 4.7k ll16W Metal Oxide AA V 10k ll16W Metal Oxide AA V 1.8k ll16W M e t a l O x i d e A A V 47k 1/16W Metal Oxide AA...
  • Page 121 Ref. No. Part No. Description Code Ref. No. Part No. Description Code VCR UNIT (Continued) v L u g V Sensor Holder V Sensor Holder V Wire Holder V Wire Holder V Wire Holder V CAS-LED Holder V LED Holder V Connecting C&d, (EF-MH) AF V Connecting Cord, (El-AB) AT V Connecting Cord, (EG-MJ) AD...
  • Page 122 Description Code Ref. No. Part No. Ref. No. Part No. Description Code MECHANISM CHASSIS PARTS V Loading Double Action Spring V Main Chassis Ass’y V Reel Disk V Reel Idler V Supply impedance Roller V Clutch Lever V Supply Impedance V Clutch Gear Ass’y Roller Frange V Reel Pulley Ass’y...
  • Page 123 MECHANISM CHASSIS PARTS...
  • Page 124 Ref. No. Part No. Description Code Ref. No. Part No. Description Code SCREWS, NUTS AND WASHERS CASSETTE HOUSING CONTROL PARTS V Cassette Housing J Set Screw Control Ass’y J Audio/Control Head V Frame (L) Screw V Frame (R) J Tilt Adjusting Screw V Drive Angle J Azimuth Adjusting V Double Action Rack...
  • Page 125 CASSETTE HOUSING CONTROL PARTS...
  • Page 126 Ref. No. Part No. Description Code Ref. No. Part No. Description Code CABINET AND NECHANICAL PARTS MODEL VT-3428X l - l Not Available Front Cabinet VCR-Flap Not Used Not Available Rear Cabinet Not Used V Frame V Top Shield V Bottom Shield...
  • Page 127 MOD IEL VT-3428X CABINET AND MECHANICAL PARTS...
  • Page 129 MODEL VT-5128X CABINET AND MECHANICAL PARTS - ---m- m--...
  • Page 131 Not Available Not Used l - l R R/C Cover R AC Cord Holder R Door Not Used R Badge, ‘SHARP” R Button, AC Main Switch R Decoration Plate, LED R Decoration Cover, VCR Flap R Indicator, Door R Button, Power...
  • Page 132 MODELS VT-3428X AND VT-51 28X CABINET AND MECHANICAL PARTS...
  • Page 133 Description Code Ref. No. Part No. Part No. Description Ref. No. Code PACKING PARTS SUPPLIED ACCESSORIES ACCESSORIES MODEL VT-3428X Unit R Operation Manual MODEL VT-5128X ACCESSORIES (NOT REPLACEMENT ITEM)

  • Page 134: Packingoftheset

    PACKING OF THE SET (VT-3428X) *Setting positions of the knobs MAIN SWITCH INITIAL CH POSITION TAPE SPEED SOUND VOLUME WOUND-UP TIMER BLUE BACKGROUND SLEEP TIMER RECORD INDEX RESET CLOCK VIDEO ADJUST LAST POWERON POWER Polystyrene mat Use 22 staples to : fix the packing i case.
  • Page 135 PACKING OF THE SET (VT-5128X) MAIN SWITCH INITIAL CH POSITION TAPE SPEED SOUND VOLUME WOUND-UP TIMER BLUE BACKGROUND SLEEP TIMER RECORD INDEX RESET CLOCK VIDEO ADJUST LAST POWER ON POWER Polystyrene mat Packing MARK * : Not replacement items.
  • Page 136 S H A R P Japan Printed in...

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