Color television/video cassette recorder (62 pages)
Summary of Contents for Toshiba MV19K3C
Page 1
Televisión y Videograbadora Precauciones de servicio durante la revisión Especificaciones generales Instrucciones de desensamble MV19K3C Clave para abreviaturas Lista de modos de servicio Revisiones preventivas e intervalos de servicio Nota para el reemplazo del IC de memoria Jigs de servicio y herramientas Ajustes mecánicos...
Page 2
FILE NO. 140-200006 SERVICE MANUAL COLOR TELEVISION/ VIDEO CASSETTE RECORDER MV19K3C...
Page 3
SERVICING NOTICES ON CHECKING 1. KEEP THE NOTICES 6. AVOID AN X-RAY As for the places which need special attentions, Safety is secured against an X-ray by consider- they are indicated with the labels or seals on the ing about the cathode-ray tube and the high cabinet, chassis and parts.
Page 4
GENERAL SPECIFICATIONS G-1.Outline of the Product inch( 480.0 mmV):Measured diagonally Color CRT degree deflection -Speed 1/2" Video Cassette Recorder Recorder/Player VHS-C Player G-2.VCR Format VHS Standard NTSC SECAM PAL-M PAL-N VHS Hi-Fi Audio System G-3.Video Recording System :Rotary,slant azimuth two head helical scan system Luminance Component :FM recording Chrominance Component...
Page 5
GENERAL SPECIFICATIONS G-16.Antenna Input Impedance VHF/UHF 75 ohm unbalanced G-17.Tuner and Receiving channel 1Tuner System 2Tuner System BS Tuner Tuner : Contactless Electric tuner Oscar(W/O HYPER) Oscar(W/ HYPER) France CATV) Others channel coverage 2 ~ 69 , 4A , A-5 ~ A-1 , A ~ I , J ~ W , W+1 ~ W+84 Tuning System Frequency syn.
Page 6
GENERAL SPECIFICATIONS G-24.Motor: 3 Motors Tape/Cassette Loading Cylinder (Direct Drive) Capstan (Direct Drive) G-25.Power Source AC 50Hz AC 60Hz EXT DC Jack G-26.Power Consumption: 86 W at AC 60 Hz(Approx.) - W at DC (at TV and VCR ON) Stand by: 6 W at AC 60 Hz(Approx.) Per Year:...
Page 7
GENERAL SPECIFICATIONS G-37.Timer back up Time More than 1/12 Minutes (at Power Off Mode) G-38.Terminals VHF/UHF Antenna Input Din Type F-Type France Type Front Video Input<RCA ø8.3> Front Audio Input<RCA ø8.3> Rear Video Input<RCA ø8.3> Rear Audio Input<RCA ø8.3> Rear Video Output<RCA ø8.3> Rear Audio Output<RCA ø8.3>...
Page 8
GENERAL SPECIFICATIONS G-42.Speaker Position Front Side Bottom Size inches Imp. 8 ohm x Output W (Typical) G-43.EXT Speaker G-44.Carton Master Carton: Need No Need Content: ---- Material: ---- / ---- Corrugated Carton Dimensions: ---- mm(W) ---- mm(D) ---- mm(H) Description of Origin Gift Box Material Double/Brown Corrugated Carton (...
Page 9
GENERAL SPECIFICATIONS G-47.Switch Front Power Channel Up Volume Up Play Channel Down Volume Down Pause/Still F.FWD/Cue Rew/Rev System Select Eject/Stop Rec/OTR One Touch Playback Main Power SW Rear Color On/Off (SECAM only) Degauss Main Power SW AC/DC G-48.Magnetic Field BV : +0.45G BV : +0.35G...
Page 10
DISASSEMBLY INSTRUCTIONS 1. REMOVAL OF MECHANICAL PARTS 1-3: TV/VCR BLOCK (Refer to Fig. 1-3) Remove the 2 screws 1. AND P.C. BOARDS Disconnect the following connectors: 1-1: BACK CABINET (Refer to Fig. 1-1) (CP355, CP353, CP401, CP502 and CP351). Remove the 6 screws 1. Unlock the support 2.
Page 11
DISASSEMBLY INSTRUCTIONS 1-5: DECK SHIELD PLATE (Refer to Fig. 1-5) 1-7: JACK PLATE AND SYSCON PCB (Refer to Fig. 1-7) Remove the 2 screws 1. Remove the screw 1. Remove the screw 2. Remove the Syscon PCB in the direction of arrow (A). Remove the screw 3.
Page 12
DISASSEMBLY INSTRUCTIONS 2. REMOVAL OF DECK PARTS NOTE When you install the Tape Guide L, install as shown in the 2-1: TOP BRACKET (Refer to Fig. 2-1) circle of Fig. 2-3-B. (Refer to Fig. 2-3-B) Remove the 2 screws 1. Slide the 2 supports 2 and remove the Top Bracket.
Page 13
DISASSEMBLY INSTRUCTIONS 2-6: LINK ASS'Y (Refer to Fig. 2-6) 2-9: TENSION ASS'Y (Refer to Fig. 2-9-A) Set the Link Ass'y to the Eject position. Move the Inclined S Ass'y to the back side. Unlock the support 1 and remove the S Reel Stopper. Remove the (A) side of the Link Ass'y first, then remove the (B) side.
Page 14
DISASSEMBLY INSTRUCTIONS 2-11: S REEL/T REEL ASS'Y (Refer to Fig. 2-11) NOTE Remove the Idler Ass'y. Do not touch the Pinch Roller. (Use gloves.) Remove the S Reel and T Reel Ass'y. When you install the Pinch Roller Ass'y, install as Remove the 2 Polyslider Washers 1.
Page 15
DISASSEMBLY INSTRUCTIONS 2-15: AHC ASS'Y/CYLINDER UNIT ASS'Y (Refer to Fig. 2-15) Middle Gear Unlock the support 1 and remove the AHC Ass'y. E-Ring Remove the 3 screws 2. Remove the Cylinder Unit Ass'y. Main Cam NOTE Pinch Roller Cam When you install the Cylinder Unit Ass'y, tighten the screws from (1) to (3) in order while pulling the Ass'y Joint Gear Link Lever Spacer...
Page 16
DISASSEMBLY INSTRUCTIONS 2-19: LOADING GEAR S/T ASS'Y (Refer to Fig. 2-19-A) 2-20: INCLINED S/T ASS'Y (Refer to Fig. 2-20) Remove the E-Ring 1 and remove the Main Loading Unlock the support 1 and remove the P4 Cover. Gear. Remove the S-S Brake Spring. Unlock the support 2 and remove the Loading Gear Remove the Capstan Brake Spring.
Page 17
DISASSEMBLY INSTRUCTIONS 3. REMOVAL OF ANODE CAP 3. After one side is removed, pull in the opposite direction to remove the other. Read the following NOTED items before starting work. NOTE After turning the power off there might still be a potential Take care not to damage the Rubber Cap.
Page 18
KEY TO ABBREVIATIONS Audio/Control H.SW Head Switch Automatic Color Control Hertz Audio Erase Integrated Circuit Automatic Frequency Control Intermediate Frequency Automatic Fine Tuning Indicator AFT DET Automatic Fine Tuning Detect Inverter Automatic Gain Control Killer Amplifier Left Antenna Light Emitting Diode A.PB Audio Playback LIMIT AMP...
Page 19
KEY TO ABBREVIATIONS SYNC Synchronization SYNC SEP Sync Separator, Separation Transistor TRAC Tracking TRICK PB Trick Playback Test Point UNREG Unregulated Volt Voltage Controlled Oscillator Video Intermediate Frequency Vertical Pulse, Voltage Display V.PB Video Playback Variable Resistor V.REC Video Recording Visual Search Fast Forward Visual Search Rewind Voltage Super Source...
Page 20
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.
Page 21
PREVENTIVE CHECKS AND SERVICE INTERVALS The following standard table depends on environmental conditions and usage. Unless maintenance is properly carried out, the following service intervals may be quite shortened as harmful effects may be had on other parts. Also, long term storage or misuse may cause transformation and aging of rubber parts. Time 1,000 1,500...
Page 22
PREVENTIVE CHECKS AND SERVICE INTERVALS CLEANING NOTE 2. TAPE RUNNING SYSTEM After cleaning the heads with isopropyl alcohol, do not When cleaning the tape transport system, use the run a tape until the heads dry completely. If the heads gauze moistened with isopropyl alcohol. are not completely dry and alcohol gets on the tape, 3.
Page 23
NOTE FOR THE REPLACING OF MEMORY IC If a service repair is undertaken where it has been required to change the MEMORY IC, the following steps should be taken to ensure correct data settings while making reference to TABLE 1. NOTE: Initial Data setting will not be possible if clock has been set.
Page 25
PREPARATION FOR SERVICING How to use the Servicing Fixture Unplug the connector CP351, CP355, CP502 and CP353, then remove the TV/VCR Block from the set. Unplug the connector CP810, CP820 and CP850, then remove the Main PCB from the VCR Block. Connect as shown in the below figure using the Service Fixture.
Page 26
MECHANICAL ADJUSTMENTS 1. CONFIRMATION AND ADJUSTMENT 1-2: CONFIRMATION AND ADJUSTMENT OF TENSION POST POSITION Read the following NOTES before starting work. Set to the PLAY mode. • Place an object which weighs between 450g~500g on Adjust the Tension Adjust until the edge of the Tension the Cassette Tape to keep it steady when you want to Arm is positioning within 0.5mm range from the make the tape run without the Cassette Holder.
Page 27
MECHANICAL ADJUSTMENTS 1-4: CONFIRMATION OF VSR TORQUE 2. CONFIRMATION AND ADJUSTMENT OF TAPE RUNNING MECHANISM Operate within 4~5 seconds after the reel disk begins to turn. Tape Running Mechanism is adjusted precisely at the Install the Torque Gauge (JG002F) and Adapter (JG002B) factory.
Page 28
MECHANICAL ADJUSTMENTS 2-2: CONFIRMATION AND ADJUSTMENT OF AUDIO/ 2-3: TAPE RUNNING ADJUSTMENT CONTROL HEAD (X VALUE ADJUSTMENT) When the Tape Running Mechanism does not work well, Confirm and adjust the height of the Reel Disk. adjust the following items. (Refer to item 1-1) Confirm and adjust the position of the Tension Post.
Page 29
MECHANICAL ADJUSTMENTS 3. MECHANISM ADJUSTMENT PARTS LOCATION GUIDE 1. Tension Adjust P4 Post 2. Tension Arm T Brake Spring 3. Guide Roller T Reel Ass'y 4. P1 Post Idler Ass'y 5. Audio/Control Head S-S Brake Spring 6. X value adjustment driver hole S Reel...
Page 30
ELECTRICAL ADJUSTMENTS 1. ADJUSTMENT PROCEDURE Read and perform these adjustments when repairing the CH-2 circuits or replacing electrical parts or PCB assemblies. CAUTION When replacing IC's or transistors, use only specified 6.5H silicon grease. (To prevent the damage to IC's and transistors.) CH-1 Fig.
Page 31
ELECTRICAL ADJUSTMENTS 2-5: CUT OFF 2-9: SUB COLOR (TV) Receive the color bar pattern. (RF Input) Place the set with Aging Test for more than 15 minutes. Set condition is AV MODE without signal. Connect the synchro scope to TP801. Using the remote control, set the brightness and Using the remote control, set the brightness, contrast, contrast to normal position.
Page 32
ELECTRICAL ADJUSTMENTS 2-15: VERTICAL LINEARITY Receive the monoscope pattern. Using the remote control, set the brightness and contrast to normal position. Activate the adjustment mode display of Fig. 1-1 and press the channel button (1) on the remote control. The Fig. 2-6 appears on the display. Press the channel button (5) on the remote control.
Page 33
ELECTRICAL ADJUSTMENTS 2-18: WHITE BALANCE Place the set with Aging Test for more than 15 minutes. Receive the color bar pattern. Activate the adjustment mode display of Fig. 1-1 and press the channel button (2) on the remote control. The Fig. 2-8 appears on the display. Adjust the adjustment mode display of Fig.
Page 36
ELECTRICAL ADJUSTMENTS 4. PURITY AND CONVERGENCE 4-3: STATIC CONVERGENCE ADJUSTMENTS NOTE Adjust after performing adjustments in section 4-2. NOTE Receive the crosshatch pattern from the color bar Turn the unit on and let it warm up for at least 30 generator.
Page 37
TV BLOCK DIAGRAM V. OUTPUT IC401 LA7840 THERMAL PROTECTION PUMP Q405 Q406 H. DRIVE H. OUTPUT X604 3.579545MHz CHROMA/IF FB401 IC604 LA76814BM Q608 BUFFER CLMP J801 VIDEO Y/C VIDEO CLMP PPC1 TINT PFC2 Y/C AUDIO PHASE V801 AHIFTER Y/C/AUDIO/ HEAD AMP/ 1/256 IN/OUT TU_AUDIO...
Page 38
Y/C/AUDIO/HEAD AMP/IN/OUT BLOCK DIAGRAM Q4010 BUFFER Y/C/A/H.AMP IC4001 LA71170M-MPB 63 61 CP4001 SP CH1 (R) SP COM C COMB SP CH2 (L) Y_DELAY 3 EP/LP CH1 (R) 2 EP/LP COM COMB BEFORE PB BGA 1 EP/LP-CH2 (L) COMP BEFORE Q4012 AFTER 320FH PB BGA...
Page 39
MICON/POWER BLOCK DIAGRAM TIMER SYSCON MICON SW1001 IC1001 OEC7041A SYSTEM RESET TAB SW IC1002 RESET-L 3 OUT PST600H POWER FAIL(DC) AT+5.6V POWER_FAIL_L P. CON 5V MSSEN-A X-OUT(12MHz) Q1023 MS_SEN A J701 X1001 Q1009 12MHz AUDIO L X_RAY_SW X-IN(12MHz) FRONT_AUDIO XC-OUT(32KHz) MSSEN-B X1002 FRONT_VIDEO...
Page 50
TV POWER SCHEMATIC DIAGRAM (MAIN PCB) TV.POWER_H P.CON+125V 127.0 127.5 R534 5A 125V 2.5A 250V 2A 125V 127.0 +B 100V DRIVE 0.82 2W Q503 CAUTION: FOR CONTINUED PROTECTION AGAINST FIRE HAZARD, 2SC4160 100V DRIVE REPLACE ONLY WITH THE SAME TYPE FUSE PROTECT DRIVE -OEC-YAC1 Q502...
Page 51
DEFLECTION SCHEMATIC DAIGRAM (MAIN PCB) V.OUTPUT IC401 LA7840 THERMAL PUMP UP PROTECTION 14.2 23.5 22.8 C412 TO DY CP401 500V 390P B05B-DVS C409 0.022 M R404 R413 R416 4.7K 1.8K FROM/TO CHROMA/IF CP820 (CP601) 8283_1112_00_000 SOUND GND SOUND+B CC004 HS401 TP-1S-05 VCR POWER H 763WAA0098...
Page 53
JACK/LED SCHEMATIC DIAGRAM (JACK/LED PCB) J351 HTJ-035-28A R350 R351 56 1/2W 56 1/2W FROM/TO I/O CD351_1 (CP351) CH27081A FRONT VIDEO IN FRONT A IN L GND/SOUND GND W805 SOUND OUT L SP OUT L POWER/PLAY R761 270 1/4W D792 SLZ-936C-07-S-T1 FROM I/O VIDEO AUDIO L...
Page 54
DECK SCHEMATIC DIAGRAM LOADING MOTOR M101 (DECK PCB) S105 BOT SENSOR Q101 S106 RPT-38PB113 S101 S102 S103 S104 FROM/TO MICON CP101 52044-0445 LDM+ LDM- FROM/TO MICON CP102 173979-2 EOT SENSOR Q102 RPT-38PB113 PCB550 VE8851 CAUTION: SINCE THESE PARTS MARKED BY ATTENTION: LES PIECES REPAREES PAR UN ETANT...
Page 55
INTERCONNECTION DIAGRAM J351 JACK/LED PCB PCB030 TE9A16 J701 HALL MAIN ROTOR SENSOR COIL MAGNET FG SENSOR TM101 HALL HALL SWITCH LOGIC CP1004 MOTOR GND I LIMIT SP351 SPEAKER CP353 SP OUT SOUND GND CAPSTAN DD UNIT CD353 CAP.M F/R DECK MECHA ASS’Y VCC(5V) M2001 HEAD AUDIO CONTROL ASS’Y...
Page 57
WAVEFORMS 16 REC 21 PB 26 POWER ON 100mV 20µs/div 1.0V 0.5ms/div 0.5V 10ms/div 17 POWER ON 22 PB 27 POWER ON 0.5V 1ms/div 1.0V 5ms/div 20.0V 20µs/div 18 POWER ON 23 PB 28 POWER ON 50mV 1ms/div 1.0V 5ms/div 5.0V 5ms/div MICON IN/OUT...
Page 58
WAVEFORMS CHROMA/IF SOUND AMP 31 POWER ON 36 POWER ON 0.5V 1ms/div 200mV 1ms/div 32 POWER ON 50mV 1ms/div 33 POWER ON 0.5V 20µs/div 34 POWER ON 200mV 20µs/div 35 POWER ON 10.5V 20µs/div NOTE: The following waveforms were measured at the point of the corresponding balloon number in the schematic diagram.
Page 61
CHASSIS EXPLODED VIEW (TOP VIEW) M2003 UN4001 H5001 H5002 M101 PCB550 (DECK PCB ASS'Y) NOTE: Applying positions AA and BA for the grease or CLASS MARK oil are displayed for this section. GREASE Check if the correct grease or oil is applied for each position.
Page 62
CHASSIS EXPLODED VIEW (BOTTOM VIEW) M2001 NOTE: Applying positions AA and BA for the grease or CLASS MARK oil are displayed for this section. GREASE Check if the correct grease or oil is applied for each position.