Sharp VT-3448X Service Manual Download

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ASSEMBLE THE MECHANISM’S PARTS

REQUIRINGTHE PHASE MATCHING

STEPS BELOW.

Assembling the pinch roller assembly, reverse guide

assembly and the pinch drive cam (on the front of the

mechanism chassis).

Insert Pinch Roller/Pinch Double Action Lever

Roller

Double
Lever

Phase Matching

Mounting the shifter (on the back of the mechanism

chassis).

Mounting the master cam (on the back of the mecha-

nism chassis).

Mounting the connection gear, slow brake and loading

motor assemblies (on the back of the mechanism chas-

sis).

Assembling the pinch roller assembly,

reverse guide assembly and the pinch

drive cam (on the front of the mechanism
chassis).

Place the following parts in position in numerical order.

Figure

Reverse drive lever
Reverse guide spring
Reverse guide lever

R/G adjusting nut
Pinch drive cam
Pinch roller

Open lever

‘I

Figure

Insert Reverse

Insert Pinch Drive Cam

Turn the reverse

Insert Open Lever.

Figure

Insert the pinch

cam,

aligning its notch to the

on the

drive lever assembly.

the pinch

lever assembly,

notch the

on the

drive lever

Figure

Summary of Contents for VT-3448X

Page 1: ... Function n AHC Automatic Head Cleaning System n Sharp Super Picture CONTENTS Page l SPECIFICATIONS 2 l IMPORTANT SERVICE NOTES a 3 l LOCATION OF USER S CONTROL 4 l DISASSEMBLY AND REASSEMBLY 6 l ADJUSTMENT OF THE TV ELECTRICAL CIRCUITRY 9 l PRECAUTIONS IN REASSEMBLING 23 l FUNCTION OF MAJOR MECHANICAL PARTS 24 l ADJUSTMENT REPLACEMENTAND Page l TROUBLESHOOTING 46 l CHASSIS LAYOUT 65 l BLOCK DIAGR...

Page 2: ...148X 50 8 cm Diagonal Measurement VT 3448X 22 0 kV at 800 uA Beam Current VT 5148X 25 0 kV at 1100 uA Beam Current VT 3448X 3 0 W at Max 8 cm Round Dynamic xlpc VT 5148X 3 0 W at Max 8 cm Round Dynamic xlpc Type VT 3448X VB370BVBKI S S Tint Tube VT 5148X VB51 KPD12X 4E Tint Tube Heater VT 3448X 6 3 V 300 mA VT 5148X 6 3 V 600 mA Focus High Bi Potential Electrostatic Outline Format Video Recording ...

Page 3: ... 0 PA for the set VT 51 48X When repairing the circuit be sure not to increase the high voltage to more than 29 3 kV at beam 0 PA for the set 2 VT 3448X To keep the set in a normal operation be sure to make it function on 22 0 kV 1 5 kV 2 0 kV at beam 800 PA in the case of the set The set has been factory Adjusted to the above mentioned high voltage VT 5148X To keep the set in a normal operation b...

Page 4: ...K indicator PROGRAM TIMER Indicator REC indicator POWER WAKE UP TIMER indicator button SHARP SUPER PICTURE button This function WIII create a clearer image dunng playback CHANNEL UP DOWN buttons VOLUME UP DOWN buttons I Rear1 VIDE IO INPUT I I AUDIO VIDEO OUTPUT ANTENNA IN terminal INPUT OUTPUT This operation manual is for VT 3448X and VT 4 ...

Page 5: ...ock any selected mode FF button l Used to fast forward the tape or to conduct Forward Video Search dunng play back mode STOP button l Used to stop the tape PAUSE button l Used to temporarily stop the tape during recording mode l Used to display a still picture during p ayback mode S H A R P DPSS buttons TV VCR COMBINATION l Press the s e button to search for the Index signal and begin playback aut...

Page 6: ...the rear cover 2 Take out the anode cap CRT PWB connectors F and G coating ground SP chip fixing screws and others 3 Remove the 2 Main PWB fixing screws and take out the Main PWB unit and the Power PWB unit 4 Remove the 4 Power PWB fixing screws and take out the Power PWB unit VT 3448X c l 1 VT 51 48X ...

Page 7: ... 4 cassette housing control fixing screws and detach the cassette housing control 7 Remove the 2 Power SW PWB fixing screws and detach the Power SW PWB 8 Remove the 6 mechanism chassis fixing screws and detach the mechanism chassis from the Main PWB 9 Remove the 4 Main PWB fixing screws and detach the Main PWB 0 6 ...

Page 8: ...cing any of the components inside disconnect the lead dressing holder Position the main PWB unit upright as shown below and connect the leads for starting the services Note Fit the VCR unit the front cabinet with the front flap door tilted at 70 80 ...

Page 9: ...ottom line Data See below bW Service mode Item Display Data Variable range DIRECT MODE DIRCT Adjustable in the DIRECT MODE V AMPLITUDE V AMP 0 127 R CUT OFF 0 255 V LINEARITY V LIN 0 31 G CUT OFF 0 255 V OUT PHASE v POS o 7 B CUT OFF 0 255 H POSITION H POS 0 31 G DRIVE GAIN 0 255 BELL FILTER BELL o 3 B DRIVE GAIN 0 255 R Y BLACK OFFSET R Y o 15 B Y BLACK OFFSET B Y o 15 Y SUB CONTRAST CONT 0 31 SU...

Page 10: ...r getting out of the service mode Allocation of special keys in the service mode HORIZONTAL POSITION key CONFIRM SET S PICTURE Y MUTE KEY SET COLOUR MAXIMIN select key TIMER ON OFF DIRECT TUNING MODE KEY RETURN VCR SLOW TEST KEY PROG NVM MODE KEY DISPLAY Adjustment precautions 1 Basically follow the sequential order of adjustments Unless otherwise specified follow the adjustment procedures 2 The m...

Page 11: ...NEARITY 50Hz 0 31 23 V LINEARITY 60Hz 0 31 17 V OUT PHASE 50Hz 0 7 04 V OUT PHASE 60Hz 0 7 01 HORIZONTAL POSITION 50Hz 0 31 08 HORIZONTAL POSITION 60HZ 0 31 12 Y SUB CONTRAST 0 31 10 SUB COLOUR 0 240 87 SUB BRIGHT 0 150 76 G DRIVE GAIN 0 255 132 B DRIVE GAIN 0 255 94 SUB TINT 0 37 16 BELL FO 0 3 01 R Y BLACK OFFSET 0 15 12 B Y BLACK OFFSET 0 15 11 PICTURE Adjust User setting Initial setting NORMAL...

Page 12: ...O T204 AFT 1 VCO coil T203 1 Disconnect the antenna from the tuner antenna terminal 2 Apply DC voltage to pin 4 IF AGC TP202 of IC201 l DC voltage 6 0 O l V Fig 2 3 Using a digital voltmeter measure the DC volt age at pin 20 PLL FIL TP203 of IC201 l The digital voltmeter must be able to take readings down to the third decimal place 10 kHz at 0 007 V 4 Relieve TP202 of the DC voltage 5 Reconnect th...

Page 13: ...rn R216 slowly in the opposite direction until the voltage goes down 0 1 V below the highest level 5 Adjust the signal level to 63 67 dBpV and make sure there is no noise 6 Now adjust the signal level to 90 95 dB and make sure there is no chrominance modulation beat Note If a 50 ohm field strength meter is used without a 50 75 impedance converter set the field strength to 55 I dBpV Pay atten tion ...

Page 14: ...r left landing is shifted to the right or to the left as shown in Fig C and Fig D adjust the opening angle of the purity magnet 4 Make sure the right and left beam landings are just as specified about the screen center Now check the cathode ray tube corners Be sure that all the landings are at rank B 5 If any other colour appears on the screen move the deflection yoke back and forth LANDING ERROR ...

Page 15: ...a Drive the wedge at point a and I Fig a RGB _________________ 4 ____ i I L 1 I swing the deflection coil upward l Fig b Drive the wedges at points b and c and swing the deflection coil downward l Fig c Drive the c wedge deeper and swing the deflection coil rightward l Fig d Drive the Id wedge deeper and swing the deflection coil leftward 2 Fix all the wedges on the cathode ray tube and apply glas...

Page 16: ...HT setting mode BRI Receive the crosshatch and gray scale signal lO Set the sub brightness data so that the third black portion 1st to 5th counted from the left of the screen of the window pattern looks sinking Note The service mode adjustment in the above steps 9 and 10 should be carried out after the white balance and background adjustments 11 Exit from the service mode 2 WHITE BALANCE AND BACKG...

Page 17: ...th the cathode ray tube s geo metrical center l H POS 50 Hz H CENTER D Select the H POS mode H POS Make the dis tances A and 9 on both sides equal l C bus data adjustment Exit from the service mode Monoscope pattern 50 Hz signal t A B II Fig 6 For the V AMP 60 Hz V LINEARITY 60 Hz V OUT PHASE 60 Hi and H POS 60 Hz adjustments their corrected data are automatically entered when the corresponding 50...

Page 18: ...e PAL colour bar be at the i I 1 i J Y G same level See Fig 8 6 Exit from the service mode l When getting out of the SUB COLOUR mode the sub colour data turns up 15 To be at the same level Fig 8 w NTSC CHROMA ADJUSTMENT 1 SUB TINT ADUJUSTMENT l C bus data adjustment 1 Receive the NTSC colour bar signal 2 Put the set in the service mode 3 Select the SUB TINT mode TINT 4 Connect the oscilloscope to ...

Page 19: ... 0 99 l The AV mode may also be picked up using the TV VIDEO key on the remote controller n PROTECTOR PERFORMANCE CHECK _ __I J401 Rear AVl J401 Rear AVl J402 Front AV2 1 BEAM PROTECTOR 1 Receive the monoscope pattern signal 2 Set the contrast control to maximum 3 Set the brightness control to maximum 4 Make a short circuit between the collector and emitter of Q853 and make sure that the protector...

Page 20: ...ect BRIGHT 3 The black level must be changeable with the key 4 TINT KEY 1 Feed the video signal NTSC colour bar Via the AA input jacks 2 Using the PICTURE ADJUST control select TINT 3 The tint must be changeable toward green with the key and toward red with the key 5 PIC NORMAL KEY 1 With the PICTURE ADJUST control select NORMAL Make sure the following normal settings are displayed Here are the no...

Page 21: ...t jacks Using the COLOUR SYSTEM key select a mode other than N4 43 and make sure the colour system does not work properly 3 Feed the video signal NTSC 3 58 colour bar Via the A V input jacks Using the COLOUR SYSTEM key select a mode other than AUTO N3 58 and make sure the colour system does not work prop erly Note When the NTSC 4 43 colour bar special sig nal is used in the AUTO mode the colour sy...

Page 22: ...set in the stand by mode 3 Display in the NVM mode El NVM 000 MODE 12 ADD A Variable by the VOL A I key ec FablebytheCH Wkey 000 l FF 4 Setting Data 1 Set data as follows ADDRESS DATA 1AA 29 1AB 78 IAC Al IAD 03 IAE 49 IAF 33 IBO 50 IBl 2E lB2 A9 183 00 lB4 8D lB5 65 lB6 03 lB7 E6 lB8 02 lB9 4c 1BA 35 1BB 49 lD2 5F lD3 I A ID4 58 ID5 4c ID6 2F lD7 50 Note The above settings are required for the IC...

Page 23: ...nitial setting position l Now place the cassette controller in position This method is applicable for the mechanism alone COUPLING THE MECHANISM TO THE PWB Match the mechanism s projections with the two symbols round reference and oval sub reference on the main PWB Place the mechanism straight down in position with due care so that the mechanism chassis s outer edges should not damage any parts ne...

Page 24: ...trols the tape drive train ing mode height with the upper and lower guides 3 Tension arm ass y Detects the tension of tape while running and 16 Pinch roller lever ass y brakes the supply reel disk via the tension band Press fits the tape to the capstan during tape running 7 Sup Main brake ass y Brakes the supply reel disk to prevent tape slackening when the unit is stopped in fast for 18 Loading m...

Page 25: ...r which runs the tape It transmits the power via the Drive belt Drive belt Transmits the power to run the tape to the Limiter pulley Lilmiter pulley ass y Transmits the power of the capstan D D motor to the reel disk via the drive idler Shifter Transmits the operation of the master cam to break ass y loading gear tension arm and clutch lever Take up loading gear Shifts the take up pole base and gu...

Page 26: ...sed for checking 2 Master Plane Jig JiGMPOOOl B Y e q Q3 P and adjusting the reel disk height Torque Gauge 9Og 4 Torque Gauge 1 2kg 5 Gauge Head JiGTG0090 C M JiGTG1200 CN JiGTH0006 AW These Jigs are used for checking and adjusting the torque of take up and supply reel disks 6 Cassette Torque Meter JiGVHT 063 CZ This cassette torque meter is used for checking and adjusting the torque Lzg i tension...

Page 27: ...ing the guide roller height 14 Torque Driver JiGTD1200 CB This is used to screw down resinmade parts the specified torque is 5kg This Jig is used for height adjustment of 15 M3 tYPe 5 5 mm quare box JiGDRiVER 1055 AR driver for reverse guide 6F 9 the reverse guide for reverse guide height adjustment Cl 7 Reverse Guide Height Adjust JiGRVGH F 8 BU This Jig is used for height adjustment of ing Jig t...

Page 28: ...III 0 Poor colour beating the specified cleaning liquid q q q 0 Low or distorted audio q q q 0 No tape running uneven colour Cl q q 0 No tape running tape slack Clean rubber and rubber con tact area with the specified q 0 NO tape llnlliIlCJ tape slack no cleaning liquid fast forward rewind motion Tension band ass y Loading Motor Idler Wheel ass y Limiter pulley ass y Supply take up Main brake leve...

Page 29: ...eassembly TO RUN A TAPE WITHOUT THE CASSETTE HOUSING CONTROL ASSEMBLY 1 Be sure to make a short circuit between TP7701 and TP7702 both located at the right on your side on the main PWB before turning on the power 2 Plug in the power cord 3 Turn on the power switch 4 Open the lid of a cassette tape by hand 5 Hold the lid with two pieces of vinyl tape 6 Set the cassette tape in the mechanism shassis...

Page 30: ... it into the hole of the tension arm with the supply auxiliary brake lever released 4 Check the reel disk height Sl 30 Notes Take enough care not to deform the tension band during installation of the supply reel disk Be careful not to damage the supply main brake and the reel relay gear l Reassembly Take up reel disk 1 Clean the reel disk shaft and apply oil to it 2 Release the take up auxiliary b...

Page 31: ...Torque gauge 69mN m 700gfcm or more The guage is held at I its maximum value Red mark l Adjustment 1 If the take up torque is outside the range clean the capstan D D motor pulley drive belt and limiter pulley with cleaning liquid then recheck the torque 2 If the take up torque is still out of range replace the drive belt Notes 1 Hold down the torque gauge so that it may not fly off 2 When checking...

Page 32: ...ation as the value 3 Place the ass y in the LP record mode and check that the take up torque is within the range l Adjustment Note If the take up torque in the playback mode is outside the The torque fluctuates due to the rotational deviation of the range replace the limiter pulley ass y limiter pulley ass y Use the center of the fluctuation at the Note value Stabilize the cassette torque meter to...

Page 33: ...the AC cord l Checking Push the PLAY button to place the ass y in the playback mode Pinch I Capstan shaft1c l Tension gauge a 8 11 8mN m 900 1 200gf Tension gauge adapter Figure l l 3 Detach the pinch roller from the capstan shaft Set the tension gauge by hooking the tension gauge adapter onto the pinch roller shaft Gradually release the pressure to allow the pinch roller to touch the capstan shaf...

Page 34: ...le adjusting cam Figure l 1 8 Adjust the tension pole adjuster so that the circle mark on the cam be within 90 left and right CHEKlNGANDADJUSTMENTOFRECORD PLAYBACK BACK TENSION l Remove the cassette housing control assembly l Make a short circuit between TP7701 and TP7702 both located at the right on your side on the main PWB Now plug in the AC cord 0 Setting 1 Open the lid of cassette torque mete...

Page 35: ...ake torque in the CW diretion is at least twice as high as that in the CCW direction Take up reel M disk rCCW 8 8 25 5mN m 90 260gf cm cw 3 9 4mN m 30 90gfxm Figure l 22 0 0 0 1 2 3 0 1 1 2 Remove the cassette housing control assembly Make a short circuit between TP7701 and TP7702 both located at the right on your side on the main PWB Now plug in the AC cord Setting Set a torque gauge to zero on t...

Page 36: ...e figure below Solder New A C head ass y A C head PWB Never touch the L 10 3 jyy J I10 3 Figure I 24 3 Align the left and of the gear of the A C head arm to the mark on the chassis and temporarily tighten the screws and to allow the A C head arm to smoothly move Reference Temporary tightening torque 0 2 N m as preferable Q Note Figure l 25 Take care that he adjustment or height of the A C head may...

Page 37: ...the lower part of the guide roller and adjust it with an adjusting Hex Wranch JiGHW0009 so that the guide roller turns smoothly Do not overloosen the setscrew which causes insecurity of the guide roller See Figure l 30 c Set the alignment tape monoscope pattern on the reel disk and place the unit in the playback mode Place a 500 g weight on the cassette tape to prevent floating of the cassette tap...

Page 38: ... output The PB CHROMA signal is to be triggered by the head switching pulse TP3302 b Play back the tape drive train alignment tape c Push the or button to change the envelope waveform from MAX to MIN and MIN to MAX Adjust the guide roller s height on the supply and take up sides with an adjusting screw driver to obtain an envelope waveform that is as flat as possible d If the tape is above or belo...

Page 39: ...emove the drive belt 0 3 Remove the screws 0 Capstan D D motor Capstan D D motor a 1 Figure l 37 l Reassembly 1 Mount the capstan motor on the mechanism chassis making sure not to allow the capstan shaft to hit the mechanism chassis and attach it with the three screws 2 Attach the reel belt Reconnect to the board to board con nector on the sensor PWB Notes 1 After installing the capstan D D motor ...

Page 40: ...of the mechanism chas sis 1 Assembling the pinch roller assembly reverse guide assembly and the pinch drive cam on the front of the mechanism chassis Place the following parts in position in numerical order Figure l 40 2 1 Reverse drive lever 0 2 Reverse guide spring 0 3 Reverse guide lever ass y 0 4 R G adjusting nut 5 Pinch drive cam 0 6 Pinch roller ass y 7 Open lever 0 I 8 3 w 2 Y I I Figure l...

Page 41: ...eeping in mind the 5 insertion points and the three release points 3 For the phase matching at the insertion point 0 see the phase matching point as shown below 4 Finally fix the shifter with two washers located on insert points and Reel Pulley Bottom Side of mechanism chassis Figure l 41 Phase Matching Point Q Cut Washer LX WZlO41 GE00 Insert Point 0 Cut Washer _ _ PointQ j Inset t Point netease ...

Page 42: ...n the master cam and the cassette control drive gear 3 Finally fix the master cam with E ring Master Cam I insert the drive gear aligning its wide tooth to the hole on the master cam Figure l 43 REPLACEMENT OF LOADING l Removal Remove 2 screws MOTOR Figure l 44 l Replacement Take out the old loading motor Place a replacement loading motor as shown above Figure l 44 Figure I 45 7 65 f 0 1 mm Press ...

Page 43: ...Y OF CASSETTE HOUSING Frame R ass y grease Apply Figure l 46 Synchro Gear Drive Gear L and Drive Gear R Stamp mechanism cod Top surface should be free scraches or soil Figure l 47 Drive angle I Drive gear R Frame Figure l 48 43 ...

Page 44: ...ut the set in the SERVICE mode by turning the power on with the STAND BY POWER button while the CH A button on the front pannel is being pressed down more than 3 seconds 2 Play the alignment tape VROCPSV then press the PROG button on the remote control to turn the set into the adjustment mode for the head switching point TEST is displayed on the screen in the playback mode it means the set is in t...

Page 45: ... picture playback NTSC EP self recording tape Monitor screen 1 Adjusting point CHA v TR buttons 1 Specification 1 No Vertical jitter I Specification No Vertical jitter 1 Play back the LP Self recorded tape in the PAL System still mode 2 Using the CH A v TR 0 buttons on the remote control make adjustment so that jitter becomes minimum 1 Play back the EP Self recorded tape in the NTSC System still m...

Page 46: ... mslde Mode detection oulsldel Sensor A Sensor6 CS EJ 1 0 ULD 1 1 PULD 1 1 VW 0 1 PB 0 0 STILL 0 1 CL n n I STiiP 1 I 0 0 FF 0 I 0 I Full loading CASSETTE INSERTION STOP 1 I I I I I Insert cassette 1 Cassette is ejected and loading motor stops t Start sensor lever turns on normal direction and master t Loading motor turns in reverse direction and master cam conterclockwise Does mechanism position ...

Page 47: ... brake comes into contact with capstan motor Cam switch is at STILL position Loading motor stops End REC PLAY STOP Press STOP key I End Pinch roller releasing PLAY 3 VSR VSR PLAY Idler swinging Turn capstan motor in reverse direction Pinch roller pressing I Press PLAY key I Cam switch iyt PB position End ...

Page 48: ... capstan motor Loading motor stops 1 End Tape unloading 1 I Capstan motor turns in reverse direction I I c Cam switch is at UL Stop position I II Stop loading motor I Are 4 supply reel NO Capstan motor turns pulses outputted clockwise 4 YES J Does the take up reel pulse output two No b edges Capstan motor turns counterclockwise in about YES 2 seconds l turns clockwise turns clockwise ...

Page 49: ... 1YES YES v Does capstan NO No motor turn in FF Are 12V and 5V Voltage supply or REW applied system in trouble direction Does capstan motor turn Are 12V and 5V applied Voltage supply system in trouble Are idler wheel ass y and reel disk in mesh Replace the idler ass y 1 YES 1 YES Is the pulse NO outputted from l 4 Replace the reel reel sensor sensor YES The cassette tape is presumably damaged I Ch...

Page 50: ... during cassette control runninq F 4 Replace Cassette control ass y Unusual sound heard with pinch roller Check pinch roller drive cam pinch Replace loading motor block 4 ii Unusual sound in FF REW mode J NO Is reel disk height as specified Adjust reel disk height 1 Y E S Thrust gap found at reel disk F l Check reel disk and main chassis And replace defective parts I I 1 I YES Drive system out of ...

Page 51: ...Check Q9911 09912 and Q9917 Check wire harness to mechanism and the sensor inputs to IC7701 from YES Fix or replace the cassette housing 1 I I I Does the start sensor cover become open when the cassette tape is inserted Check the start sensor cover YES Does the start sensor pin 2 of IC7701 go to L level when the cassette tape is inserted NO F Check the start sensor and the way up to pin 2 of IC 77...

Page 52: ... of lC7702 YES Check lC7702 and L level of pin 5 Is the correct voltage at the loading ND motor terminal Check between lC7702 and all the way up to the loading motor I R e p l a c e t h e l o a d i n g m o t o r Replace the cassette cam gear etc SYSTEM CONTROL TROUBLESHOOTING OIG FLOWCHART NO l 5 rP 8 No power x x I I I I r I I I I Are serial clock pulse and TV data NC pulse applied to pins 66 and...

Page 53: ... the AT12V line I Check replace the capstan motor I 1 Are there the take up supply reel pulses at pins 4 and 5 of connector AM 1 NO HEAD SWITCHING PULSE TROUBLESHOOTING FLOWCHART NO l 8 No head switching pulse D PG 4 4v D FG 0 A Is the drum motor NO See FLOW CHART NO rotating l 9 YES Are the drum PG and drum FG signal inputted YES Check pin 18 of IC7701 to pins 86 and 87 of b and signal line of he...

Page 54: ...C7701 r I I I Is 5V at pin 1 of connector AD NO Check the ATSV line YES Is 12V at pin 4 of connector AD NO Check the AT1 2V line YES I FLOWCHART NO I 10 I The drum motor runs only for a few seconds I Is drum PG signal at pin 3 of AD connector Check the drum motor YES Is drum PG signal at pin 86 of IC7701 NO Check between the connector AD and all the way up to pin 86 of IC7701 YES Is H SW pulse at ...

Page 55: ...in IC7701 84 of IC7701 1 NO YES v Is there the durm FG YES Is there the head Check the composite signal at pin 87 of switching pulse at pin sync signal at pin 53 of IC7701 18 of IC7701 Ic2201 02201 Q2202 NO YES and Q7706 all the way up to pin 84 of IC7701 Check pins 3 and 5 of Is there the drum control NC the connector ME and output at pin 78 of the drum motor IC7701 YES Check the signal line of d...

Page 56: ...tween AC NO Does there appear the capstan FG signal at pin connector and IC7701 I Does PB CTL signal appear at pin 97 of IC7701 YES NO Does CTL amplifier circuit of IC7701 pins 92 to 97 operate normally Does the noise appear at pin 97 when touch R7774 by hand YES Replace IC7701 Is the harness AA MH NO t 4 Replace the harness normal AA MH I I I I YES I Does the A C head operate normally Replace NC ...

Page 57: ... J YES IS pin 35 of 1 3301 at NC 5V level b Check the BIAS CTL H line I 1 I Replace cylinder 1 I I Are there Y C data and clock signals at pins 17 and 18 of IC2201 respectively when recording starts YES Check data and clock signals from IC7701 Is there a signal at pin 15 of IC2201 Is there 5V at pin 54 No and 14 of IC2201 t 4 Check the PC5V line Is there a Chroma NO Check the signal line all signa...

Page 58: ...ck the H SW Pulse pin 1 of IC3301 line I 1 I I YES 1 Check connector AH 1 1NO GOOD r Head cleanning No GooD l 4 Check video head and or replace lC3301 I I I J Is there a signal at pin NO 4 of IC2201 b wj YES Is there a signal at pin NO Is there 5V at pin 14 70 of IC2201 and 54 of IC2201 NC Check the PCSV line 1 YES YES m Ed Check pin 56 of IC2201 i FRepiacelCPPO1 Check the signal line all the way ...

Page 59: ...tage of pins 41 and 45 of IC2201 normal YES Is there L level at pin 52 of IC2201 NO j Check A MUTE I H line YES Replace IC2201 No record 1 I I 1 I YES YES Is there a signal at pin 34 of IC2201 NC b Is the operate of IC6601 normally YES YES Replace IC2201 I I I Is there supply voltage of NO 9V feed to at pin 2 of Check PC 9V line T6601 Is there a signal Bias Audio sig at pin YES Check MH AA harness...

Page 60: ...1 Check IC7701 and signal line of serial data serial clock and ready L INFRARED R C TROUBLESHOOTING No operation is possible from the infrared remote control FLOWCHART NO 2 3 Does the infrared remote control cl Replace the infrared remote control a s r e q u i r e d I 1 Is 5V applied at pin 1 of the remote control receiver P 4 Check the 5V and GND lines I 1 I 1 1 YES Is L pulse given out of pin 1 ...

Page 61: ...ck Normal about OV t Abnormal t about 115V Is there a NO signal at pin 10 of IC301 YES Check IC801 and Is there a Check or signal at NO replace IC351 c pin 8 of IC351 and or adjacent YES A parts ____ ______ I D701 D702 I D703 D704 i c707 __ _ ___ i c j I J Check IC301 and adjacent parts _ _ R609 R611 Q601 Q602 J J ______ _________ 1 C866 0 I I I I _________ _____ i Check IClOOl i Does the 9V B app...

Page 62: ...ts I I _____ ______J r _____ I jLpiqy FLOWCHART NO 2 7 I Check IC301 IF Circuit 1 and adjacent parts _ _____________ _ Does waveform appear No Check IC301 and at pin 3 of IC351 adjacent parts I I 1 r__________ ___________ I 1 Check IC351 and 1 adjacent parts I I _ ___ ____________J r___ ____ I Check the speaker i I 8 FLOWCHART NO 2 8 NO PLAYBACK PICTURE Is there a signal at pin 1 No of IC8Ol _ FLO...

Page 63: ..._______ Is there a chroma signal 5 Check IF Circuit and j at pin 42 of IC801 adjacent parts I 0 1 lC801 I I X801 16 2MHz I I ___ _ ___ __I Specific colours are not produced in colour broadcast reception _ _ _ _ _ _ _ _ _ Is there a chroma signal NQ Check IF Circuit and at pin 42 of IC801 adjacent parts 1 YES Is the white balance I properly adjusted 1 i f l O i _____ _ I Readjust the white balance ...

Page 64: ...VT 3448X VT 51 48X 64 ...

Page 65: ...R T S E N S O R nm IN UNIT AV2 J402 3351 AL POWER SW I I I I C7702 x7701 R s1002 VOL DOWN VI DE0 IN AUD 0 I 1 CFlOOl A IIOlClO tl x1001 03 I c2202 r j A lC2201 x5501 a d cl X5502 T550 1 617704 E N D SEN AE PC IC401 K ul 3401 lC791 V I D E O I N V I D E O O U T SOR CRT UN11 a A U D I O I N A U D I O O U T 1 I 2 I 3 I 4 5 6 I 65 ...

Page 66: ... 3 0 I a 0 N ...

Page 67: ... DOWN Up DOWN UP PCPV I ATGSV P CON H ATIZV PROT ECT 7 SYNC AV E I N DET MUTE LB V C R PB A U D I O 0804 A M P 0805 PC9V 2 AUDIO AWIO IN 2 IN I DIG DIG IC80 I YI B I N PAL SECAM NTSC AUDIO Y GNO B Y R Y R Y B Y Y OUT IN Fscl IN IN OUT OUT OUT PCPV I I PWB C 0 5 0 BP M B 0 SOA SDA 0 i 3 IC202 s L 7 I E IN E IN 4 ND HEATERGND 170 z T O f B T T O PWB A I 1 2 3 I 4 5 I 6 67 ...

Page 68: ...KILL SYNC I I DET I I V C R PE AWIO _ _ _ V C R PB VIDEO PL V C R REC Al 010 V C R REC VIDEO TO VCR SECTION F cvCd 16 2MVic C IC30 I AWIO S W STNC CTL AV2 f TP201 AFT IC20 I v P S IF T203 Illr_l cl I I I f AVI V I N A I N V I N A O U T V O U T I AV R E A R 7 8 9 10 11 I 12 I 68 ...

Page 69: ...61 S W O N O F F 0751 R E L A Y S W 0752 O N O F F DELEY PHOTO COUPLER I 0753 ERROR DETECT I IC702 PHOTO COUPLER IC751 ERROR DETECT 1 D755 O N T I M PB I I I T O PWB A I V T P PROTECl 0 I 0756 Y I FE753 P O W E R TRANS T O PWB A I I rmr I I 0 2 Fb T ic II Ill I 12 I 14 I II y 2 _ 1 I Y Y RY751 075 I F6755 FBz6 m I f f 1 1 a 1 I 2 3 4 5 I 6 69 ...

Page 70: ...CR KEY U T IC50I V OUTPUT PC IC70I TO PW B A t v n v 1 PWB D POWER Slh UNIT II II II II I I II II I I I I I I I I I I I I I I I I POWER CONTROL ACC70 I EL 2 i3 I G I r k2 L AAl v m w J 7 I 8 9 I 10 I 11 12 I 70 L799 ADG f Et j I ...

Page 71: ...SFORMER BETWEEN TV RECEIVER AC LINE TO ELIMINATE HAZARD OF ELECTRIC SHOCK CAUTION This circuit diagram is original one therefore there may be a slight difference from yours NOTES 1 The unit of resistance Q is omitted K kQ 1000 Q M MR 2 All resistors are l 8 watt unless otherwise noted 3 The unit of capacitance F is omitted P PF P WV 4 The values in parentheses are the ones in the PB mode the value...

Page 72: ...0M iX2994CE HA8303F S I D E V I E W x 1LL BASE COLLECTOR EMlITER 2SA1266 ZSE 2SC3279N 2SC1906 1LI BASE COLLECTOR EMITTER 12345 123 STRF6524 TA7805S 1 9 TA7348P H A K hi 123 iX0037CE PSTGOOD 000 iX0066TA N I I B A S E L I COLLECTOR EMllTER DTC144ES 123 1 9 SE115N TDA7056A B C E 2SD1877 2SD2586 l 5 BA7755 0 Ii ECB 2SC3789 1 PQ05RDll PQOSRDll 1 7 IX0640CE BA6209 72 ...

Page 73: ...RMS VT 3448X CD AC 1 OVp p 0 AC 0 7Vp p CD AC O SVp p I AC 2 7Vp p DC 4 8V DC 1 7V DC 1 8V DC 1 2V I IO 5 AC 2 8Vp p DC 1 2V AC 3 OVp p AC 1 8Vp p DC 1 2V DC OV I I I I I I I AC l Wp p DC OV AC 47Vp p DC 2V AC 14OVp p DC OV 73 ...

Page 74: ...VT 3448X VT 51 48X WAVEFORMS VT 51 48X 0 AC 1 OVp p 0 AC 0 7Vp p AC O SVp p AC 2 7Vp p DC 4 8V DC 1 7V AC 2 8Vp p DC 1 8V DC 1 2V DC 1 2V AC 47Vp p AC 122Vp p DC 2V DC OV D AC 103OVp p DC OV 74 ...

Page 75: ...VT 3448X VT 51 48X MODEL VT 3448X SCHEMATIC DIAGRAM OF TV SECTION t I I I rs sv TO PWB 8 T O PWB 6 GG TO PWB A T O F B T 1 I 2 3 4 5 6 75 ...

Page 76: ...VT 3448X VT 51 48X JlAlN and CRT Socket Unit T O PWB E I CR r3 s GM L I 4 S C 2 SI t I I I I III II II J ii mbL L J TO VCR SECTION 7 8 I 9 10 11 12 I 76 ...

Page 77: ...VT 3448X VT 51 48X MODEL VT 3448X SCHEMATIC DIAGRAM OF TV SECTION P hrB B T O DY T O PWB C PO ER V H OUT UNIT 1 2 I 3 4 I 5 I 6 ...

Page 78: ...VT 3448X VT 51 48X DOWER POWER SW VCR KEY and R C Unit PWB E R VCR KEY UNIT TO PWB A I Pl rB D 1 POWER SW UNIT I s w 4 r w v v v v 1 7 I 8 9 I 10 11 12 78 ...

Page 79: ...I VT 3448X VT 51 48X MODEL VT 5148X SCHEMATIC DIAGRAM OF TV SECTION H G F E D C B A rliiiiT TO PWB 8 CRT PWB c G3 62 T O F B T T O PWB A 1 2 3 4 5 6 79 ...

Page 80: ...MAIN and CRT Socket Unit TO PWB E VT 3448X VT 51 48X ICBO I TB1226CN lPAL SECAM NTSCI L L I 1111 r 1 I r 6 jz i J A IN V IN I OUT V CUT I T E l T O VCR SECTION 7 8 9 10 11 12 I 80 ...

Page 81: ...I VT 3448X VT 51 48X MODEL VT 5148X SCHEMATIC DIAGRAM OF TV SECTION PWB B POWER V H OUT UNIT TO PWB A TO PW6 A 7 S m a L i 757 II 04754 CNW 2069PE P 1 I 2 I 3 4 5 I 6 81 ...

Page 82: ... 48X POWER POWER SW VCR KEY and R C Unit PWB E R C VCR KEY UNIT 1050 I IX064DCE lLA7630 TO PWB A t I m w 1 PWB D POWER SW UNIT 0702 c705 AA1 II II I1 II I I II II II II II II II II II II w w m m 7 8 9 I 10 11 12 1 82 ...

Page 83: ...ANT I J 4 I cd ...

Page 84: ...Infrared Remote Control Unit 1 RRMCG1336PESA 1 2 3 4 5 6 I 84 ...

Page 85: ... 3448X VT 5 148X BLOCK DIAGRAM OF VCR SECTION n OVERALL BLOCK DIAGRAM IC40 I VIDEO SNCT S W XC80 I VIDEO INWT I I I AV2 IC30 I AUDIO YLECT SW D l SPEAKER Au 10 OUTPUT fv ocEss IC80 I I I AA I 1 2 3 4 5 6 ...

Page 86: ...VT 3448X VT 51 48X DD SYLLUER uEcn4NIsM cQNTFfoL I I I 5CAPSTANC t AU 10 PB I AUDIO REC ORW FG w ORWPG SERVO PROCESS ERROR AMP Ot UM MOTOR FG SYSTEM CoNfRoLLER CAPSTAN FG l 7 8 I 9 10 I 11 12 I 86 ...

Page 87: ... PROCESS BLOCK DIAGRAM V SYNC SEP A T 5V IC770 I SERVO SYSTEM CONTOROLLER u uMAPcBLocx I V I I I I l4 SW P BLOCK CAP ___________ __ ___________ t I 1 r I I izzt ER I I II J L A I IIIII IC770 I TZPIN TP7703 w CTL TP77Tw ED A T 5V MC I a _ 4 5 1 2 3 4 5 6 87 ...

Page 88: ...VT 3448X VT 51 48X 1 P A L GocniI I__ i IC770 I 76 4 kc I I _ _ _ _ _ _ _ _ _ _ _ I IC77OI TSV PWM AC MC 1 1 CAPSTAN I l MOTOR UUf ___ __ i 7 8 9 10 11 12 I 88 ...

Page 89: ...BLOCK DIAGRAM OF VCR SECTION l SYSTEM CONTROL BLOCK DIAGRAM J I J L l i l l L I I I I ii I I I I I I t I I I I I I c I I I I i 1 I 2 3 I 4 I 5 I 6 r 89 ...

Page 90: ...SYSTEM CONTROLLER r 1 I I I I ATSV I Ftum I TV cD cut1 SYS CON RESET f AT P A l 4 a f 9 4 I I A CAM SW B f OUTSICE 1 7h DT7D5 7b I I L II lh rlr I I I I ATSV I I P I I t I I I AT5V I I I I TAKE UP REEL Q SENSOR AM ATW I I AD M I I ATSV I Q ...

Page 91: ... OF VCR SECTION n AUDIO BLOCK DIAGRAM AUOIO HEAD AU010 AU010 Fe615 I EADPB w I EAMREC C6616 1 I 7 AE HEAD AE HEAD HEAD SW c6617 26618 i I PB EP SW c6607 I i AUDIO DET I BIAS FRTER I I I i 11 R66oI L T6601 PC 9v b L6602 a612 1 2 3 4 5 6 91 ...

Page 92: ...VT 3448X VT 51 48X C6622 8 mm GV iidB Gv IOcBfP8 YC 81 AUDIO Pf OCESSOR AUDIO MUTE04 FROM PIN OF IC77Ol AU010 MUTE H B I A S CTL 0 O FROM PIN49 OF IC770 I 7 8 9 10 11 12 1 92 ...

Page 93: ...I VT 3448X VT 51 48X BLOCK DIAGRAM OF VCR SECTION n VIDEO SIGNAL FLOW BLOCK DIAGRAM d II I I I lo Jvp pl 1 2 3 I 4 5 6 I ...

Page 94: ... HREC LLMNANCE SIUWAL b E E SIW IO P p RECIPB 10 32vp p REC rnl IO P p FiEc Fm fO5VP p REC rn I I OVp p REC EEl V C R REC VIDEO IFROM T V S E C T I O N tT0 T V SECTICed FROM PI OF IC IC220I t3303F Y C h AUDIO Pf OCESSO 1 BUFIST DEEHPnA MSECAM P C 5v FRW PIN28 O F LC7700 7 I 8 I 9 10 I 11 12 I 94 ...

Page 95: ... I W 4 The values in parentheses are the ones in the PB mode the values without parentheses are the ones in the REC mode VOLTAGE MEASUREMENT CONDITIONS 1 DC voltages are measured between points indicated and chassis ground by VTVM with AC 220 24OV 50Hz supplied to unit and all controls are set to normal viewing picture unless otherwise noted 2 Voltages are measured with 1OOOOpV B W or coloour sign...

Page 96: ...58MHz NTSC v l OVp p REC EE PB 1 REC EE PB 1 REC EE PB 1 RECIEE 1 PB 1 PB 1 Pin 28 of IC2201 V 4 6Vp p V 400mVp p Pin 53 of IC2201 TP3301 COMPOSITE SYNC PB CHROMA SERVO SERVO Jr c 6 4 j v 4 I V v 4 4vp p V 2 8Vp p Pin 84 of IC7701 TP7703 EE REC PB CTL V SYNC AUDIO AUDIO AUDIO H lkHz V 0 25Vp p Pin 42 of IC2201 REC EE H lkHz v l lVp p TP6601 REC EE PB H 70 5kHz v 7ovp p Pin 1 of connector AA REC 96...

Page 97: ...VT 3448X VT 51 48X SCH 07705 ZSDI306lEl FF REW SW 07704 RH PX0004PEZZ END SENSOR 07706 V SIHC ZSC2412K RT798 V SYNCJNV I 1 2 I 3 4 5 I 6 97 ...

Page 98: ...830 I ZSC2412K 0 L E D ORIVE 2SC24 I2K 0 LED DRIVE boY3fl 2SC24 t2K IO LED DRIVE oY3fl 2SC24 l2K 01 L E D DRIVE SERVO CONTROLLER r PC 5V GENERATOR 0991 I T O TV SECAM S W 0785 I ATSV GENERATOR I w JToR 09 a I 9 10 11 I 12 I 98 ...

Page 99: ...I VT 3448X VT 51 48X SCHEMATIC DIAGRAM OF VCR SECTION VCR 2 Unit PWB A MAIN Ut lIT VCR21 TO VCR I I I 06607 XC24 I2K IO 02216 02217 2SA I037K IO1 2SC24 I2K IO 1 I 2 3 4 5 I 6 ...

Page 100: ...VT93448X VT 51 48X I IC2202 MSM7470M DELAY LINE T O T V 7 a I 9 10 11 I 12 I 100 ...

Page 101: ...PRINTED WIRING BOARD ASSEMBLIES VI _ r r Y _ i _ I PWB C CRT Socket Unit Wiring Side PWB B POWER Unit Wiring Side XJNTK9328WEI I 1 PWB D PI 0 1 2 I 3 4 5 I 6 101 ...

Page 102: ...IWER SW H V Unit iring Side PWB F SENSOR Unit Wiring Side PWB E VCR KEY R C Unit Wiring Side 7 a 9 10 11 12 1 102 ...

Page 103: ...b ccl I 0 I u m I n I 0 I I I ...

Page 104: ...W 3448X VT 51 48X nit Wiring Side 1 7 a 9 10 11 12 104 ...

Page 105: ...VT 3448X VT 51 48X PWB A MAIN Unil 1 2 3 4 5 6 ...

Page 106: ...VT 3448X VT 51 48X Chip Parts Side 7 8 I 9 I 10 11 12 1 106 ...

Page 107: ... THE PARTS HERE SHOWN ARE SUPPLIED AS AN ASSEMBLY BUT NOT INDEPENDENTLY nTU201 VTUVTSTGHD641 R VHF UHF Tuner INTEGRATED CIRCUITS IC201 VHiBA7357S 1 R PIF SIF IC202 RH iX0037CEZZ R Zener IC UPC574J IC301 VHiTC4066BP 1 R Audio Select Switch IC351 VHiTDA7056A 1 R Audio Amp IC401 VHiTA7348P 1 J Video Select Switch IC402 VHiNJM2230M 1 R Sync Detector IC790 VHiPQ05RDl l l R 5V Regulator IC791 VHiPQOSRDl...

Page 108: ...AB AC AA AB AC AA AC AB AB AF AF AD AA AB AA AA AA AA AA AE AB AB Ref No Part No Description Code DIODES 0202 RH DX0475CEZZ R D i o d e AB 0203 RH DX0475CEZZ R D i o d e AB D205 RH EX0615GEZZ J Zener D i o d e AA D206 RH DX0475CEZZ R D i o d e AB D207 RH EX0621 GEZZ J Zener Diode AB 0208 RH EXO615GEZZ J Zener Diode AA D209 RH EXO61 SGEZZ J Zener Diode AA D401 RH DX0475CEZZ R Diode AB 0402 RH DX047...

Page 109: ...Electrolytic AC C206 VCKYCYl HF103Z R 0 01 50V Ceramic AA C207 VCEAGAl HW106M R 10 50V Electrolytic AC C208 VCKYCYl HF103Z R 0 01 50V Ceramic AA C209 VCKYCYl HFlO3Z R 0 01 50V Ceramic AA C210 VCKYCYlHF103Z R 0 01 50V Ceramic AA c211 VCKYCYl HF103Z R 0 01 50V Ceramic AA C212 VCKYCYlHF103Z R 0 01 50V Ceramic AA C213 VCQYTAlHM683K R 0 068 50V M y l a r AB C214 VCKYCYlHF103Z R 0 01 50V Ceramic AA C215...

Page 110: ... AA AB AA AC AB AB AA AA AB AB AB AA AC AB AC AB AB AB AA AC AB AC AB AA AB AB AA AA AB AA AA AA AC AA AB AA AA AA AA AB AC AC AB AB AB AB AC AA AA AA C806 VCKYCYl HF103Z R 0 01 50V Ceramic C807 VCEAGAlAW107M R 100 1 OV Electrolytic C808 VCKYCYlHF103Z R 0 01 50V Ceramic C809 VCKYCYl HF103Z R 0 01 50V Ceramic C810 VCCCCYlHH120J R 12p 50V Ceramic C811 VCKYCYl HFlO3Z R 0 01 50V Ceramic C812 VCEAGAlAW...

Page 111: ...o Part No jEE Description Code C5515 VCKYCYlHF103Z R 0 01 50V Ceramic AA C5516 VCKYPAlHF103Z R 0 01 50V Ceramic AA C 5517 VCKYPAl HF103Z R 0 01 50V Ceramic AA C5518 VCCCCYl HH181 J R 180 50V C e r a m i c AA C5519 VCKYD41CY103N R 0 01 16V Ceramic AA C5521 VCKYCYlHB221K R 220 50V C e r a m i c A A C5522 VCKYD41CY103N R 0 01 16V Ceramic AA C5524 VCEAEAlCWlOGM R 10 16V Electrolytic AB C5525 VCKYCYlHF...

Page 112: ...tion Code R224 R225 A R226 R227 R229 R230 R231 R234 R235 R236 R238 R239 R240 R242 R244 R246 R247 R250 R251 R252 R253 R254 R301 R302 R303 R304 R305 R306 R307 R308 R312 R325 R326 R327 R332 R333 R338 R339 R340 R341 R342 R343 R344 R345 R348 R349 R351 R352 R353 R357 R362 R363 R401 R402 R406 R407 VRS CYl JF472J VRS CY 1JF472J RR XZ0026CEZZ VRD RA2EEl OOJ VRS CYl JF103J VRS CYl JFl53J VRS CYl JFOOOJ VRS ...

Page 113: ...tion Code VRG RF2EBlROJ R 1 1l4W A R791 R792 R793 R794 R795 R796 R797 R798 R799 R801 R805 R806 R807 R808 R809 R810 R811 R812 R813 R814 R815 R816 R817 R818 R819 R820 R821 R822 R823 R824 R825 R826 R827 R828 R830 RlOOl R1002 R1004 R1005 R1006 R1007 R1008 R1009 RlOlO RlOll R1012 R1013 R1014 R1015 R1016 R1018 R1020 R1021 R1022 R1023 R1024 VRS CYl JF123J R 12k ll16W VRS CYl JF103J R 10k 1 16W VRS CY1JF4...

Page 114: ...A Carbon AA Ref No Part No Description Code R1095 R1098 R1099 R2201 R2202 R2203 R2204 R2205 R2208 R2209 R2210 R2212 R2213 R2215 R2217 R2218 R2219 R2220 R2223 R2224 R2225 R2226 R2227 R2229 R2230 R2235 R2236 R2237 R2238 R2239 R2240 R2241 R2244 R2247 R2248 R2249 R2250 R2251 R2252 R2253 R2254 R2255 R2256 R2257 R2258 R2259 R2262 R2265 R2270 R2276 R2292 R2294 R2295 R3308 R3309 R3310 VRS CYl JFlO6J VRS C...

Page 115: ...Metal Oxide AA R7730 VRD RA2BE102J R 1 k ll8W Carbon AA R7731 VRS CYl JF102J R lk l l 6W Metal Oxide AA Ref No Part No Description Code R7734 VRS CY 1JFlO3J R 10k ll16W Metal Oxide AA R7736 VRS CYlJF103J R 10k ll16W Metal Oxide AA R7739 VRS CYl JFlO3J R 10k ll16W Metal Oxide AA R7740 VRS CY 1JF103J R 10k 1 16W Metal Oxide AA R7743 VRD RA2BE103J R 1Ok ll8W Carbon AA R7744 VRD RA2BE103J R 10k ll8W C...

Page 116: ...G MISCELLANEOUS PARTS CN751 QCNW 2142PEZZ J Connecting Wire PA CN752 QCNW 2143PEZZ J Connecting Wire PB CN753 QCNW 2144PEZZ J Connecting Wire PC CN852 QCNW 2138PEZZ J Connecting Wire K AF AK AL AG VT 3448X CN852 QCNW 2139PEZZ J Connecting Wire K VT 5148X FB351 RBLN 0037CEZZ R Ferrite Bead FBl 001 RBLN 0037CEZZ R Ferrite Bead FB1002 RBLN 0037CEZZ R Ferrite Bead FB1003 RBLN 0037CEZZ R Ferrite Bead F...

Page 117: ...AK AX AF AF AF AD AL AM AA A d AB AA AA AA AA AA AB AB AC AA AD AB AB AC AB AB AB AB AB AC AB AB AC AC AB AB AA AC AB AB AC AG AK AE AA AB Ref No Part No Description Code D766 D773 D774 D775 D778 D780 PR701 L602 L609 L609 AL701 L751 T601 T601 AT602 A T602 AT701 AT701 C502 c503 c504 c505 C506 c507 C508 c509 c510 c511 C516 c517 c517 C526 VCQYlAl HM122J R 1200 50V M y l a r C610 VCFYSB2EB823J R 0 082...

Page 118: ... AA C767 VCKYPAlHF103Z R 0 01 50V Ceramic AA C782 VCKYPAl HBlOl K R 1 OOp 50V C e r a m i c AA C783 VCKYPAlHF103Z R 0 01 5OV Ceramic AA C784 VCEAGAlHW226M R 22 50V Electrolytic AB RESISTORS A R501 RR XZ0029CEZZ R 3 3 1 2W Fuse Resistor AB R504 VRD RA2BE221 J R 220 1 8W C a r b o n AA R506 VRD RA2BE471 J R 470 1 8W C a r b o n AA Ref No Part No Description Code R510 VRD RM2HD2R2J R510 VRD RM2HDl R8...

Page 119: ...766 VRS VV3DBl83J R 18k 2W Metal Oxide AA R767 VRD RA2EE821 J R 820 1 4W C a r b o n AA R780 VRD RA2BE220J R 22 1 8W Carbon AA R781 VRD RA2BE183J R 18k 1 8W C a r b o n AA R782 VRD RA2BE103J R 10k 1 8W C a r b o n AA R783 VRD RA2BE332J R 3 3k 1 8W C a r b o n AA R784 VRD RA2BE683J R 68k 1 8W C a r b o n AA MISCELLANEOUS PARTS CN754 QCNW 2069PEZZ R Connecting Wire AC A F601 QFS J1023CEZZ R Fuse lA ...

Page 120: ...3J R 12k 2W Metal Oxide VRD RA2BE471 J R 470 1 8W C a r b o n VRD RA2BE561 J R 560 1 8W C a r b o n VRD RA2BE471 J R 470 1 8W C a r b o n VRSVV3DB123J R 12k 2W Metal Oxide VRS VV3DB123J R 12k 2W Metal Oxide VRD RA2BEl52J R 1 Sk 1 8W Carbon VRD RA2BE152J R 1 5k 1 8W C a r b o n AD R878 AE R879 AD R880 AE AD CN851 AE CN851 AA AB AB AB FB851 P851 P852 P854 A SC851 A SC851 AB AA AA AA AC AC AA AC PWB ...

Page 121: ...2GEZZ R Take up Reel Sensor GP SXCI AF D7703 RH PX0252GEZZ R Supply Reel Sensor 1 563 AF D7704 RH PX0253GEZZ R Cam Switch B oPlse4 07705 RH PX0253GEZZ R Cam Switch A Gels94 D7707 RH PX0234GEZZ R Cassette LED CAPACITORS C7722 VCKYD41CY103N R 0 01 16V Ceramic C7723 VCKYD41CY103N R 0 01 16V Ceramic C7735 VCKYD41 CY103N R 0 01 16V Ceramic C7736 VCKYD41CY103N R 0 01 16V Ceramic RESISTORS R7777 VRD RA2B...

Page 122: ...ouble Action Lever AD V Reverse Guide Lever Ass y AL V Reverse Drive Lever AD V Slow Brake AE V Open Lever AE V Clutch Lever AF V Supply Main Brake Ass y AF V Take up Main Brake Ass y AD V Auto Head Cleaner Ass y AG V Shifter AH V Audio Control Head Spring AC V Reverse Guide Spring AE V Loading Double Action AE Spring V Pinch Double Action Spring AD V Tension Spring V Drive Belt V Reel Disk V Load...

Page 123: ...VT 3448X VT 51 48X MECHANISM CHASSIS PARTS 5 3 s 11 1 2 3 4 5 6 I 123 ...

Page 124: ... V E Ring E 4 V Washer W5 2 9 5 0 5 V Washer W5 2 9 5 0 3 V Washer W5 2 9 5 0 4 V Washer W5 2 9 5 0 6 V Washer W5 2 9 5 0 7 V Reverse Guide Adjusting Nut V Cut Washer V Cut Washer V Cut Washer V Drum Base Mounting Screw SW3P 8S V Cut Washer AA 307 308 309 AA 310 311 AA 312 313 AA 314 AD 315 AD 316 AD 317 AD AD AB AA AA AB AA AB CHLDX3074TEVO LANGF9592AJFW LHLDX1028AJOO LHLDX 1029AJOO LHLDXI 030AJZ...

Page 125: ...VT 3448X VT 51 48X CASSETTE HOUSING CONTROL PARTS 125 ...

Page 126: ...2121 PEZZ QSW P0599CEZZ VSP0080P G6WA LANGT0030PEFW LANGT0033PEFW LANGT0034PEFW LANGT0035PEFW LCHSMOO66PEKZ LCHSM0067PEKZ LHLDWI 01 SPEZZ LHLDW1033CEOO LHLDW 1047PEZZ LHLDZOI 05PEZZ LHLDZI 759CEKZ PSLDM0214PEFW PSLDM0227PEFW PSLDM0228PEFW PSLDM0229PEFW QACCL3002PEZZ QSW FOOOl PEZZ R Purity Magnet R Wedge Gum x3 Yoke Positioning R Wire Grounding Strap R Degaussing Coil L799 R Deflection Yoke DY601 ...

Page 127: ...ID aJ I 0 CJ I m I n 0 I I I ...

Page 128: ...VT 3448X VT 51 48X 128 ...

Page 129: ...I VT 3448X VT 51 48X MODEL VT 5148X CABINET AND MECHANICAL PARTS 1 iL_ F l D 1 13 r I I I I I I I I I I I I ...

Page 130: ...VT 3448X VT 51 48X 13 24 1 7 8 9 10 11 12 I 130 ...

Page 131: ...Wl 01 SPEZZ LHLDW 1033CEOO LHLDWl047PEZZ LHLDZO105PEZZ LHLDZl759CEKZ PSLDM0214PEFW PSLDM0227PEFW PSLDM0228PEFW PSLDM0229PEFW QACCL3002PEZZ R Wire Grounding Strap CN801 R Degaussing Coil L799 R Angie R Screw x2 R Connecting Wire CN1701 R Switch S1702 R Speaker SP301 R Angle R Angle R Angle R FBTAngle R Power Chassis Frame R Main Chassis Frame R Wire Holder xl R Wire Holder x4 R Wire Holder x3 R Wir...

Page 132: ...W AE AH ACCESSORIES NOT REPLACEMENT ITEM UBATU0002AJZZ Dry Batteries MODEL VT 3448X SPAKC6260PEZZ Packing Case SSAKA0031 PEZZ Polyetylene Sack SSAKHOOl SPEZZ Polystyrene Sack SPAKX2628PEZZ Buffer Material TLABK0002PEZZ Number Card TLABNOOOI PEZZ Serial Number Label MODEL VT 5148X SPAKC5118CEZZ Packing Case SSAKA0277CEZZ Polyethylene Sack TLABV0694CEZZ Bar Code Label SPAKP0645CEZZ Polystylene Sack ...

Page 133: ...UR SYSTEM AUTO BLUE BACKGROUND ON VIDEO ADJUST RESET POWER MAIN SWITCH TAPE SPEED WOUND UP TIMER LAST POWER ON OFF w OFF SLEEP TIMER OFF CLOCK OFF Polyethylene Sack v Buffer Material rt Polystyrene Sack Packing Case Serial Number Label Number Card _ _ _ _ _ 1 Use 22 staples to fix the packing Ij case _ _ _ _ _ _ _ _ _ 133 ...

Page 134: ... AUTO BLUE BACKGROUND ON VIDEO ADJUST RESET POWER MAIN SWITCH TAPE SPEED WOUND UP TIMER SLEEP TIMER LAST POWER ON OFF W OFF OFF Seri al Number L I CLOCK I OFF I Polyethylene Sack Y Polystyrene Sack A A L Jr Buffer Material MARK Not replacement items R C unit Number Card II P 77 staples to king Laws _ _ _ _ _ 134 ...

Page 135: ...VT 3448X VT 51 48X Memo ...

Page 136: ...part of this publication may be reproduced stored in a retrieval system or transmitted in any form or by any means electronic mechanical photocopying recording or otherwise without prior written permission of the publisher SHARP CORPORATION AV Systems Group Quality Reliability Control Center Yaita Tochigi 329 21 Japan ...

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