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Sharp 37VT-26H, Service Manual

The Sharp 37VT-26H Service Manual is a comprehensive user manual for this exceptional product, available for free download at manualshive.com. With detailed instructions and diagrams, this manual allows users to understand and optimize the full range of features and functions of the Sharp 37VT-26H effortlessly. Experience a seamless user experience with this downloadable manual.

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37VT-26H(GY)

WARNING

The chassis in this receiver is partially hot. 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.

SERVICE MANUAL

S99P337VT26H/

In the interests of user-safety (Required by safety regula-
tions in some countries) the set should be restored to its
original condition and only parts identical to those specified
be used.

MODEL

SERVICE MANUAL

TV/VCR COMBINATION TELEVIDEO

MODEL 37VT-26H(GY)

SHARP CORPORATION

37VT-26H(GY)

TV/VCR COMBINATION

TELEVIDEO

Chassis No. VP-8

37VT-26H(GY)

FEATURE

Ë

AIS (Automatic Instruction System)

Ë

ASS (Automatic Sorting System)

Ë

VPS/PDC (Video Program System / Program Delivery
Control)

Ë

FASTEXT

Ë

VIDEO Plus+

Ë

Post Cord Security

Ë

On Screen Digital Channel/Sound Level/Tuning Display,
Control (Contrast, Colour, Brightness, Tint, Sharpness,
White temp) Symbol and Level

Ë

Blue Back Off Timer

Ë

52 Key, Wireless Remote Control Unit

Ë

Channel Skip

Ë

High Speed and Double Speed Video Search System

»

PAL : 3 times/7 times (SP/LP)

»

NTSC : 3 times/5 times (SP/LP)

5 times/15 times (EP)

Ë

DPSS (Digital Program Search System)

Ë

Quick Start Playback with Full Loading System

Ë

Digital Automatic Tracking Control

Ë

Automatic Playback Function

Ë

AHC (Automatic Head Cleaning System)

Ë

Sharp Super Picture

Ë

345 Times Hi-Speed FF/REW

CONTENTS

Page

»

SPECIFICATIONS ................................................................................................................................................................................. 2

»

IMPORTANT SERVICE NOTES ............................................................................................................................................................ 3

»

LOCATION OF USER'S CONTROL ...................................................................................................................................................... 4

»

DISASSEMBLY AND REASSEMBLY .................................................................................................................................................... 6

»

ADJUSTMENT OF THE TV ELECTRICAL CIRCUITRY ........................................................................................................................ 9

»

PRECAUTIONS IN REASSEMBLING ................................................................................................................................................ 19

»

FUNCTION OF MAJOR MECHANICAL PARTS ................................................................................................................................. 20

»

ADJUSTMENT, REPLACEMENT AND ASSEMBLY OF MECHANICAL UNITS ................................................................................. 22

»

ADJUSTMENT OF THE VCR ELECTRICAL CIRCUITRY ................................................................................................................... 41

»

MECHANISM OPERATION FLOWCHART AND TROUBLESHOOTING GUIDE ............................................................................... 44

»

CHASSIS LAYOUT .............................................................................................................................................................................. 63

»

BLOCK DIAGRAM OF TV SECTION .................................................................................................................................................. 64

»

BLOCK DIAGRAM OF VCR SECTION ............................................................................................................................................... 66

»

DESCRIPTION OF SCHEMATIC DIAGRAM ...................................................................................................................................... 75

»

SOLID STATE DEVICE BASE DIAGRAM ........................................................................................................................................... 76

»

WAVEFORMS ..................................................................................................................................................................................... 77

»

SCHEMATIC DIAGRAM ...................................................................................................................................................................... 78

»

PRINTED WIRING BOARD ASSEMBLIES ......................................................................................................................................... 92

»

REPLACEMENT PARTS LIST ............................................................................................................................................................ 99

»

PACKING OF THE SET ..................................................................................................................................................................... 115

Summary of Contents for 37VT-26H

Page 1: ...t Sharpness White temp Symbol and Level Ë Blue Back Off Timer Ë 52 Key Wireless Remote Control Unit Ë Channel Skip Ë High Speed and Double Speed Video Search System PAL 3 times 7 times SP LP NTSC 3 times 5 times SP LP 5 times 15 times EP Ë DPSS Digital Program Search System Ë Quick Start Playback with Full Loading System Ë Digital Automatic Tracking Control Ë Automatic Playback Function Ë AHC Auto...

Page 2: ... at 800 µA Beam Current Speaker Output 3 0 W at Max 5 9 cm oval type 1pc Picture Tube Type VB370BVBK1S S Tint Tube Heater 6 3 V 300 mA Focus High Bi Potential Electrostatic ËVCR SECTION Outline VHS Video System Colour Video Cassette Recorder Format VHS PAL NTSC Standard Video Recording System Rotary Slant Azimuth 2 Head Helical Scan System Luminance FM Recording Chrominance Low Frequency Converted...

Page 3: ...sure at close range the following precautions should be observed 1 When repairing the circuit be sure not to increase the high voltage to more than 25 3 kV at beam 0 µA for the set 2 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 µA in the case of the set The set has been factory Adjusted to the above mentioned high voltage If there is a poss...

Page 4: ...37VT 26H GY 4 LOCATION OF USER S CONTROL ...

Page 5: ...5 37VT 26H GY LOCATION OF USER S CONTROL CONTINUED ...

Page 6: ...t the anode cap CRT PWB connectors H G and F coating ground SP chip fixing screws and others 3 Remove the Main PWB fixing screws and take out the Main PWB unit and the Power PWB 4 Remove the 4 Power PWB fixing screws and take out the Power PWB unit DISASSEMBLY AND REASSEMBLY G F H 3 2 4 1 1 ...

Page 7: ...tte housing control fixing screws and detach the cassette housing control 7 Remove the 7 mechanism chassis fixing screws and detach the mechanism chassis from the Main PWB 8 Remove the 3 Main PWB fixing screws and detach the Main PWB 9 Remove the 2 Tuner Def and IF PWB fixing screws and detach the Tuner Def and IF PWB 5 6 7 7 7 7 8 9 ...

Page 8: ...lder Position the main PWB unit upright as shown below and connect the leads for starting the services DISASSEMBLY AND REASSEMBLY CONTINUED AO AJ H PC PC K AV A A F G S AJ S K F H AV PA PB PB PA AB G AB 70 80 Note Fit the VCR unit the front cabinet with the front flap door tilted at 70 80 ...

Page 9: ...T PHASE V POS 0 7 B CUT OFF 0 255 H POSITION H POS 0 31 G DRIVE GAIN 0 255 BELL FILTER BELL 0 3 B DRIVE GAIN 0 255 R Y BLACK OFFSET R Y 0 15 B Y BLACK OFFSET B Y 0 15 Y SUB CONTRAST CONT 0 31 SUB COLOUR COLOR 0 240 SUB BRIGHT BRI 0 150 SUB TINT TINT 0 37 Top line Service mode item See below Micon version display Bottom line Data See below Note Item selectable by the CH keys and data by the VOL key...

Page 10: ...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 MAX MIN 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 marked step...

Page 11: ...NEARITY 50Hz 0 31 25 V LINEARITY 60Hz 0 31 18 V OUT PHASE 50Hz 0 7 05 V OUT PHASE 60Hz 0 7 02 HORIZONTAL POSITION 50Hz 0 31 05 HORIZONTAL POSITION 60HZ 0 31 09 Y SUB CONTRAST 0 31 0 SUB COLOUR 0 240 91 SUB BRIGHT 0 150 100 G DRIVE GAIN 0 255 128 B DRIVE GAIN 0 255 128 SUB TINT 0 37 20 BELL FO 0 3 01 R Y BLACK OFFSET 0 15 8 B Y BLACK OFFSET 0 15 8 PICTURE Adjust User setting Initial setting NORMAL ...

Page 12: ...d 3 If the right or left landing is shifted to the right or to the left 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 Outward Mo...

Page 13: ...NVERGENCE 1 Adjust the convergence on the fringes of the screen in the following steps Fig a Drive the wedge at point a and swing the deflection coil upward Fig b Drive the wedges at points b and c and swing the deflection coil downward Fig c Drive the c wedge deeper and swing the deflection coil rightward Fig d Drive the d wedge deeper and swing the deflection coil leftward 2 Fix all the wedges o...

Page 14: ...ontroller call the SUB BRIGHT setting mode BRI Receive the crosshatch and gray scale signal 10 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 mod...

Page 15: ...OS mode V POS Align the screen center with the cathode ray tube s geo metrical center H POS 50 Hz H CENTER D Select the H POS mode H POS Make the dis tances A and B on both sides equal Exit from the service mode Adjust point Fig 3 2 FOCUS ADJUSTMENT 1 Receive the monoscope pattern signal 2 Make the PICTURE ADJUST setting to NORMAL 3 Adjust the focus control so that the middle areas between the pat...

Page 16: ...ub tint data to obtain the waveform as shown in Fig 5 6 Exit from the service mode Fig 5 Fig 4 Ë Ë Ë Ë Ë A V INPUT AND OUTPUT CHECK 1 1 VIDEO and AUDIO OUTPUT CHECK 1 Receive the E 69CH 100 white colour bar 400 Hz 100 modulation audio 2 Terminate the video output with a 75Ω impedance Make sure the out put is as specified 1 0 Vp p 3 dB 0 71 1 41 Vp p 3 Terminate the audio output with a 10k ohm impe...

Page 17: ...ent 1 21 3 5 7 9 11 13 15 17 19 2 4 6 8 10 12 14 16 18 20 1 Audio right output 2 Audio right input 3 Audio left output 4 Commom earth for audio 5 Earth for blue 6 Audio left input 7 Blue input 15 Red input 16 Red Green Blue control 17 Earth for video 18 Earth for Red Green Blue control 19 Video output 20 Video input 21 Plug shield 8 Audio video control 9 Earth for green 10 Not used 11 Green input ...

Page 18: ... The BACK GND must be changeable with the key with the key The warm direction with the key the cold direction with the key 7 V TONE KEY 1 Receive the monoscope pattern signal 2 Using the PICTURE ADJUST control select V TONE 3 The sharpness must be changeable with the key 8 CHANNEL SIGH DISPLAY COLOUR 1 The display colour of all the channel 0 99 signs must be green AFT on 9 COLOUR SYSTEM KEY 1 Inpu...

Page 19: ...and install the mechanism with due care so that the parts are not damaged So as to fix the mechanism to the main PWB tighten up the two screws One for fixing the mechanism and the head amplifier shield the other on the main PWB s soldering side and located near the loading motor Connect again the FFC cable AA MH AD ME AH MZ between the mecha nism and the main PWB PARTS WHICH NEED PARTICULAR CARE W...

Page 20: ...7 Supply main brake ass y 8 Take up main brake ass y 9 Pinch drive cam 10 A C Head ass y 11 Reverse guide lever ass y 12 Casecon drive gear 13 Take up reel disk 14 Pinch roller lever ass y 15 Drum ass y 16 Loading motor 17 Drum motor 18 Take up pole base ass y 27 Fixing guide 17 15 10 27 11 5 9 14 12 8 16 13 4 6 2 7 3 1 18 FUNCTION OF MAJOR MECHANICAL PARTS TOP VIEW ...

Page 21: ...22 19 20 12 23 FUNCTION OF MAJOR MECHANICAL PARTS BOTTOM VIEW No Function No Function 19 Slow brake lever 20 Master cam 21 Capstan D D motor 22 Reel belt 23 Clutch lever 24 Limiter pulley ass y 12 Casecon drive gear 26 Shifter ...

Page 22: ...g the torque of take up for measuring tape back tension These Jigs are used for checking and adjusting the torque of take up and supply reel disks This Jig is used with the tension gauge Rotary transformer clear ance adjusting jig There are two gauges used for the tension measurements 300 g and 2 0 kg This Jig is used for height adjustment of the reverse guide for reverse guide height ad justment ...

Page 23: ...with the specified cleaning liquid Clean tape contact area with the specified cleaning liquid Clean rubber and rubber contact area with the specified cleaning liquid Replace the roller of the cleaner when it wears down Just change the AHC roller assembly for new one Screen swaying Cassette not loaded or unloaded No tape running tape slack Tape slack Video head cleaning procedure 1 Apply one drop o...

Page 24: ...1 Turn off the power switch 2 Take out the cassette tape 500g Notes 1 When fitting the S E sensor holder to the cassette controller frame L R take care 2 Misengagement of teeth of casecon drive gear and drive angle gear causes malfunction The cassette cannot be set load and ejection are repeated 3 In the case when you use the magnet screw driver never approach the magnet driver to the A C head FE ...

Page 25: ...on arm ass y Supply reel disk Take up reel disk Supply main brake ass y Take up main brake ass y Tension band ass y Figure 1 4 Note Check that the reel disk is lower than part A but higher than part B If the height is not correct readjust the reel disk height by changing the poly slider washer under the reel disk Reverse guide Position pin Cassette lock release shaft Take up reel disk Figure 1 6 M...

Page 26: ... direction 2 Make sure that the indication of torque gauge is not less than 30mN m 306gf cm Note Whenever replacing the reel disk perform the height checking and adjustment Notes 1 Hold the torque gauge by hand so that it is not moved 2 Do not keep the reel disk in lock state Do not allow long time measurement 7 CHECKING AND ADJUSTMENT OF TAKE UP TORQUE IN REWIND MODE Remove the cassette housing c...

Page 27: ...ot within the setting replace the limiter pulley assembly Note When the torque cassette is set put a weight 500g to prevent rise When the cassette torque meter is taken out turn off the power switch 9 CHECKINGANDADJUSTMENTOFTAKE UP TORQUE IN VIDEO SEARCH REWIND MODE Remove the cassette housing control assembly After short circuiting TP7701 J930 and TP7702 J359 provided at the left on the main PWB ...

Page 28: ...plug in the power cord then turn on the power Checking 1 Press the play button to set the playback mode Tension gauge 8 8 11 8N 900 1 200gf Pinch roller Capstan shaft Tension gauge adapter 500g Figure 1 13 1 Detach the pinch roller from the capstan shaft Do not separate excessively Or the pinch lever and pinch double action lever may disengage 2 Engage the tension gauge adapter with the pinch roll...

Page 29: ...0 25mm Tension pole adjuster Figure 1 18 Tension pole adjuster adjusting range Adjust so that the delta mark of tension pole adjuster is within 90 range left right 13 CHECKING AND ADJUSTMENT OF RECORD PLAYBACK BACK TENSION Remove the cassette housing control assembly After short circuiting TP7701 J930 and TP7702 J359 provided at the left on the main PWB plug in the power cord Setting 1 Turn off th...

Page 30: ...he reel disk and torque gauge pointer rotate at equal speed and make sure that the value is within the setting CW direction 8 8 to 23 5mN m 90 to 240gf cm CCW direction 3 9 to 9 8mN m 40 to 100gf cm CCW CW Torque gauge Checking the brake torque at the take up side Remove the cassette housing control assembly After short circuiting TP7701 J930 and TP7702 J359 provided at the left on the main PWB pl...

Page 31: ...d Tilt screw 2 Unsolder the PWB fitted to the A C head Notes 1 Whenreplacing nevertouchthehead Ifyoutouched clean with the cleaning liquid 2 When removing the screw 3 take care so that the spring may out 3 Align the left end of gear of A C head plate with the punched mark of chassis tentatively tighten the screws 1 and 2 so as to ensure smooth motion of A C head plate Tentative tightening torque m...

Page 32: ...djusting jig Mechanism chassis 13 38mm Height adjusting nut Box driver CCW 500g A Capstan motor shaft An example of crease near the reverse guide Weight to prevent float 500g Mechanism chassis Reverse guide Fixing guide 3 Set the tape and check for tape crease near the reverse guide in the playback mode If crease is found turn the reverse guide adjustment nut to remove crease As for crease check r...

Page 33: ...es 1 Previously set the tracking control in the center posi tion and adjust the envelope waveform to maximum with X value adjustment nut Thereby the tape run rough adjustment is facilitated 2 Especially the outlet side envelope waveform must have higher flatness 3 Tape run adjustment 1 Connect the oscilloscope to PB CHROMA enve lope output test point TP3301 set oscilloscope sync to EXT trigger inp...

Page 34: ...e crease is found remove it as stated in 17 HEIGHT ADJUSTMENT OF REVERSE GUIDE item 3 4 A C head X value adjustment 1 Tentatively fix A C head arm screws 1 and 2 by the method described in 15 Replacement 3 2 After shortcircuiting TP7701 J930 and TP7702 J359 plug in the power cord turn off the power set the alignment tape VROCPSV turn on the power and then playback the tape As a result the auto tra...

Page 35: ...d in 17 HEIGHT ADJUST MENT OF REVERSE GUIDE Capstan D D motor control PWB Capstan D D motor 1 Reel belt 1 4 4 5 3 2 Upper drum D D rotor ass y D D stator ass y 2 20 REPLACEMENT OF DRUM D D MOTOR 1 Set the eject mode 2 Withdraw the main power plug from the socket Removal Perform in numerical order 1 Disconnect the FFC cable 1 2 Unscrew the D D stator assembly fixing screws 2 3 Take out the D D stat...

Page 36: ...ustment After that perform also the electrical adjustment Playback switching point adjustment X position adjustment and check 7 After replacing the drum clean the drum Figure 1 39 2 1 3 7 6 4 3 2 1 5 Figure 1 40 22 ASSEMBLING OF PHASE MATCHING MECHANISM COMPONENTS Assemble the phase matching mechanism com ponents in the following order 1 Assemble the pinch roller assembly and pinch drive cam 2 Mou...

Page 37: ...int 2 Fit the pinch drive cam so that the notch of pinch drive cam aligns with the dent of pinch drive lever assembly Fit the pinch drive cam so that the notch of pinch drive lever assembly aligns with the half round notch of chassis Turn the reverse guide lever assembly counterclockwise to the stopper Open lever 2Insert Pinch Roller Pinch Double Action Lever Ass y 3Insert Open Lever Figure 1 41 3...

Page 38: ...fter Insert point 3 Insert point 2 Insert point 4 Insert point 5 Rotation point 2 Release point 3 Phase matching point 1 Shaft 2 Shaft 1 Shaft 1 1 Make sure that the loading gear is at the phase matching point 1 as shown below 2 Install paying attention to 5 insertion points and 3 release points 3 For the phase matching at the insertion point 1 see the phase matching point 2 as shown below 4 Final...

Page 39: ...e 10 2 mm 0 0 2 Note See the figure below for the phase matching between the master cam and the casecon drive gear 3 Finally fix with the E ring 25 REPLACEMENT OF LOADING MOTOR Removal 24 INSTALLING THE MASTER CAM AT REAR SIDE OF MECHANISM CHASSIS 1 Make sure beforehand that the shifter is at the point as shown below 2 Place the master cam in the position as shown below Replacement 1 Remove the lo...

Page 40: ...Gear Drive Gear L and Drive Gear R 26 ASSEMBLY OF CASSETTE HOUSING 1 Drive Gear and R Drive angle ass y MSPRT0381AJFJ Apply grease Apply grease Apply grease LANGF9592AJFW Top surface should be free from scratches or soil Drive angle Drive gear R Frame ...

Page 41: ...5 5 0 5H lines 5 5 0 5H Iines V sync CH 2 HEAD SWITCHING PULSE CH 1 VIDEO OUT CH 1 1V div 50µsec div CH 2 2V div 50µsec div 1 Play back the alignment tape VROCBZF 2 Press the CH TR button and the 0 button of remote control at the same time to turn the set into the adjustment mode for the head switching point TEST is displayed on the TV screen 3 Connect a dual trace oscilloscope to the test points ...

Page 42: ...ck Input Signal Tape NTSC system SP EP self recording tape Test point Monitor Screen Control Remote Control Specification No noise bar on the monitor screen 1 Play back the NTSC system SP self recorded tape in the slow mode 2 Press the CH TR button and the 0 button of remote control at the same time to turn the set into the adjustment mode for the SP slow tracking preset TEST is displayed on the T...

Page 43: ...the remote control make adjustment so that jitter becomes minimum 3 Now press the STOP button to stop the tape ADJUSTMENT OF NTSC SYSTEM EP STILL PICTURE VERTICAL SYNC Measuring Monitor TV instrument Mode Still picture playback Input signal NTSC EP self recording tape Test point Monitor screen Adjusting point CH TR buttons Specification No Vertical jitter 1 Play back the EP Self recorded tape in t...

Page 44: ...0 1 0 1 0 1 0 0 0 1 0 1 0 0 0 0 0 0 1 1 1 1 1 VSR PB SLW STP 10 354 12 812 Loading motor turns in reverse direction and master cam counterclockwise CASSETTE INSERTION STOP Cassette inserting Full loading YES YES YES NO NO NO Unloading Loading motor starts in normal direction and master cam counter clockwise Does mechanism position SW come off within 2 5 sec Are start end sensors at low level befor...

Page 45: ...apstan motor stops NO YES Press STILL key Pinch roller releasing Idler swinging Pinch roller pressing Loading motor turns clockwise and master cam turns counterclockwise Capstan motor in turns reverse direction Loading motor turns counterclockwise Cam switch is at VSR position Set capstan motor to search speed Is supply reel sensor signal outputted Press REW key Release pinch roller Cam switch is ...

Page 46: ...r stops End Loading motor turns in clockwise and master cam turns counterclockwise Does 4 supply reel pulses output Does the take up reel pulse output two edges Capstan motor turns clockwise Loading motor turns clockwise Cam switch is at Eject position Loading motor stops Capstan motor stops Press EJECT key Tape unloading Cassette eject End Capstan motor turns clockwise Capstan motor turns counter...

Page 47: ...ler wheel ass y and reel disk in mesh Does the pulse output from reel sensor The cassette tape is presumably damaged 2 REC PLAY FAILURE MODE RELEASE NO NO NO NO NO NO NO NO YES YES YES YES YES YES YES YES Is the master cam at PB position Does loading motor operate Modes changing smoothly through cam switch Mode sensor CAM SW A and B system in trouble or master cam malpositioned Loading motor contr...

Page 48: ... in mesh Is supply reel disk winding torque normal Does pulse output from reel sensor Check main PWB YES YES YES YES YES NO NO NO NO NO YES YES NO NO YES Press REW key 4 i Unusual sound in cassette insertion and ejection mode Is unusual sound heard during cassette countrol running Is unusual sound heard with pinch roller lever going up or down Is unusual sound heard during loading unloading Check ...

Page 49: ...ntact with any part on main PWB Turn capstan motor by hand Is unusual sound heard Check drive system s gears for damage Replace damaged gear with new one Reel disk Limiter pulley ass y Idler wheel ass y Check reel disk and main chassis And replace defective parts Adjust reel disk height Rearrange the parts on main PWB Are there thrust gap found at reel disk ...

Page 50: ... 5V line normal CASSETTE CONTROL TROUBLESHOOTING A cassette tape is not taken in Is the cassette housing distored Does the start sensor cover become open when the cassette tape is inserted Does the start sensor pin 5 of IC2001 go to L level when the cassette tape is inserted Does pin 5 of IC7701 go to H level about 1 8V when the cassete tape is inserted Does pin 2 of IC7701 go to about 11V when th...

Page 51: ... pin 6 of IC7701 and all the way up to pin 20 of IC2001 Is reel pluse at pin 80 of IC2001 when the take up reel disk is turning YES NO Is the correct voltage at the loading motor terminal Check between IC7701 and all the way up to the loading motor YES NO Does the loading motor run Replace the cassette cam gear etc Replace the loading motor YES YES Is H level about 1 8V at pin 6 of IC7701 when ree...

Page 52: ...ctor AC 1 6 2 7V Insert the cassette and put the unit in FF or REW mode NO Are there the take up supply reel pulses at the collectors of D7702 D7703 Check between D7702 and pin 80 of IC2001 between D7703 and pin 79 of IC2001 Check Replace the take up supply reel sensors D7702 D7703 4 2V 0 4 4V 0 D PG D FG about 4 6V FLOWCHART NO 1 8 HEAD SWITCHING PULSE TROUBLESHOOTING No head switching pulse NO Y...

Page 53: ... and ME or check replace the drum motor Check between the connector AD and pin 77 of IC2001 and between the connector AD and pin 78 of IC2001 NO YES YES YES NO FLOWCHART NO 1 10 The drum motor runs only for a few seconds Is drum PG signal at pin 3 of AD connector Check between the connector AD and all the way up to pin 90 of IC2001 Is drum PG signal at pin 90 of IC2001 NO Check replace IC2001 Is H...

Page 54: ...put at pin 77 of IC2001 Is there the durm FG signal at pin 89 of IC2001 Check FG and PG signal at pins 3 and 5 of the connector ME and the drum motor Check the signal line of drum PG Is there the drum control voltage applied to pin 7 of connector AD Check the composite sync signal at pin 14 of IC2201 Q2217 Q2218 and Q7706 all the way up to pin 56 of IC2001 Check the signal line between pin 7 of AD...

Page 55: ...just the height of the A C head YES YES Does there appear the capstan FG signal at pin 87 of IC2001 NO YES Check the capstan FG signal line between AC connector and IC2001 Is there capstan control signal at pin 76 of IC7701 YES YES Does there appear the V sync at pin 56 at IC2001 Is there REC CTL signal output at pins 95 94 of IC2001 Is there the capstan control voltage applied to pin 4 of AC conn...

Page 56: ...he signal line all the way up to pin 57 of IC2201 Check the signal line all the way up to pin 57 of IC2201 NO Check PC5V and the BIAS CTL H line Replace IC3301 NO NO YES YES NO NO FLOWCHART NO 1 14 VCR RECORDING MODE CHROMA TROUBLESHOOTING Record is in black and white E E colour mode Are there Y C data and clock signals at pins 8 and 7 of IC2201 respectively when recording starts Check the PC5V li...

Page 57: ... when playback starts Check the signal at pin 99 of IC2201 Frequency 4 43MHz PAL SECAM Frequency 3 58MHz NTSC NO Check data and clock signals from pins 72 and 52 of IC2001 Is there a signal at pin 30 of IC3301 X5501 X5502 and peripheral circuit Replace IC2201 NO Check the pin 35 of IC3301 is 0V Bias CTL H line and peripheral circuit of IC3301 YES NORMAL ABNORMAL YES YES Check connector AH Check be...

Page 58: ...4 of IC2201 Check the PC 5V line NO NO Are there the IIC bus date and clock signal at pins 8 and 7 of IC2201 Check between pins 8 and 7 of IC2201 and all the way thru to pins 72 and 51 of IC2001 Is voltage of pins 86 and 88 of IC2201 normal Is there a signal at pin 85 of IC2201 Check signal line between pin 85 of IC2201 and TP6601 Is there L level at pin 72 of IC2201 Check A MUTE H line YES YES Re...

Page 59: ... infrared remote control function Is 5V applied at pin 2 of the remote control receiver Replace the infrared remote control as required Check pin 14 of IC1001 and or receiver and R2008 Is fluorescent lighting enough away from the set YES Reposition the set not to be exposed to strong light YES Is there short circuit in the key input or IC2001 Check key input terminals Check IC2001 Is AC cord conne...

Page 60: ... Check IC401 and adjacent parts NO NO Is there a signal at pin 47 of IC801 Check IC801 and adjacent parts Check Q851 Q852 and adjacent parts Check TUNER Circuit and bias Check Tuner AGC Is there a signal at pin 8 of IC851 NO NO NO NO NO NO YES YES YES YES YES YES YES Check TU201 YES YES Check the signal line between pin 3 of IC351 and pin 8 of IC301 Is there a signal at pin 3 of IC351 Is there a s...

Page 61: ...RE Is there a signal at pin 1 of IC801 Check IC801 and adjacent parts as same as NO PICTURE Check the VCR TROUBLE SHOOTING NO PLAYBACK YES Does waveform appear at pin 8 of IC351 Check the speaker Normal Pin 53 of IC801 Abnormal IC801 pin 54 bias check Normal IC801 Abnormal IC501 bias check Normal D501 D504 C502 C504 C511 R513 Abnormal Check IC501 the connectors F5 F6 and adjacent parts NO YES FLOW...

Page 62: ...Hz Specific colours are not produced in colour broadcast reception Circuits to be checked IC801 and its Adjacent Circuit R G B Output Circuit FLOWCHART NO 2 11 NO SPECIFIC COLOUR NTSC NO NO NO YES YES YES NO Is there a chroma signal at pin 42 of IC801 Check IF Circuit and adjacent parts Is the white balance properly adjusted Is some colour produced in B W broadcast reception Readjust the white bal...

Page 63: ...37VT 26H GY 88 A B C D E F G H I J 1 2 3 4 5 6 7 8 9 10 CRT UNIT VOLTAGE MEASUREMENT MODE PB Parentheses REC Without Parentheses ...

Page 64: ...89 37VT 26H GY JACK UNIT A B C D E F G H I J 1 2 3 4 5 6 7 8 9 10 VOLTAGE MEASUREMENT MODE PB Parentheses REC Without Parentheses ...

Page 65: ...37VT 26H GY 90 A B C D E F G H I J 1 2 3 4 5 6 7 8 9 10 CONTROL UNIT VOLTAGE MEASUREMENT MODE PB Parentheses REC Without Parentheses ...

Page 66: ...37VT 26H GY 37VT 26H GY 92 93 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 A B C D E F G H I J PRINTED WIRING BOARD ASSEMBLIES PWB A MAIN UNIT WIRING SIDE ...

Page 67: ...37VT 26H GY 37VT 26H GY 94 95 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 A B C D E F G H I J PWB A MAIN UNIT WIRING SIDE CHIP PARTS ...

Page 68: ...37VT 26H GY 96 A B C D E F G H I J 1 2 3 4 5 6 7 8 9 10 PWB B SUB UNIT WIRING SIDE PWB E JACK UNIT WIRING SIDE PWB D CRT UNIT WIRING SIDE PWB F CONTROL UNIT WIRING SIDE ...

Page 69: ...97 37VT 26H GY A B C D E F G H I J 1 2 3 4 5 6 7 8 9 10 PWB C POWER UNIT WIRING SIDE ...

Page 70: ...Q6604 VS2SC2001LK 1 R C2001LK SW AA Q6605 VSUN2113 1 R UN2113 Inv AA Q6606 VSUN2212 1 R UN2212 SW AA Q6607 VSUN2113 1 R UN2113 Buffer AA Q6608 VS2SC1623L51E R C1623L5 Audio Mute AB Q7706 VS2SC1623L51E R C1623L5 V Sync Inv AB Q7711 VS2SC1623L51E R C1623L5 23V H AB Q7712 VS2SB1117KU1E R B1117KU 23V SW AE Q7721 VS2SC1623L51E R C1623L5 Capstan AB Hi Speed SW Q7722 VS2SA812 M51E R A812 M5 Capstan AC Hi...

Page 71: ...rolytic AB C324 VCEA0A1HW106M R 10 50V Electrolytic AB C325 VCKYCY1HB102K R 1000p 50V Ceramic AA C326 VCKYPA1HB102K R 1000p 50V Ceramic AA C401 VCEA0A1CW476M R 47 16V Electrolytic AB C403 VCEA0A1HW106M R 10 50V Electrolytic AB C404 VCEA0A1CW476M R 47 16V Electrolytic AB Q7725 VS2SC1623L51E R C1623L5 12V SW AB Q7726 VSUN2213 1 R UN2213 AA Q7727 VS2SA1298Y 1 R A1298Y AB Q8303 VS2SC1623L51E R C1623L5...

Page 72: ...Y1CF104Z R 0 1 16V Ceramic AA C3314 VCKYCY1CF104Z R 0 1 16V Ceramic AA C3315 VCKYCY1HF103Z R 0 01 50V Ceramic AA C3316 VCKYCY1CF104Z R 0 1 16V Ceramic AA C405 VCEA0A1CW476M R 47 16V Electrolytic AB C406 VCKYCY1HF103Z R 0 01 50V Ceramic AA C407 VCQYTA1HM104J R 0 1 50V Mylar AA C408 VCQYTA1HM104J R 0 1 50V Mylar AA C409 VCQYTA1HM104J R 0 1 50V Mylar AA C411 VCKYCY1HB102K R 1000p 50V Ceramic AA C421 ...

Page 73: ...R301 VRS CY1JF472J R 4 7k 1 16W Metal Oxide AA R302 VRS CY1JF472J R 4 7k 1 16W Metal Oxide AA R304 VRS CY1JF223J R 22k 1 16W Metal Oxide AA C3317 VCEAKM0JW476M R 47 6 3V Electrolytic AB C3318 VCCCPA1HH180J R 18p 50V Ceramic AA C5501 VCKYCY1HB392K R 3900p 50V Ceramic AA C5502 VCEA9A1HW105M R 1 50V Electrolytic AB C5503 VCEA9A1HW225M R 2 2 50V Electrolytic AB C5504 VCCCCY1HH221J R 220p 50V Ceramic A...

Page 74: ...VRS CY1JF102J R 1k 1 16W Metal Oxide AA R2019 VRS CY1JF102J R 1k 1 16W Metal Oxide AA R2021 VRD RA2BE472J R 4 7k 1 8W Carbon AA R2023 VRD RA2BE102J R 1k 1 8W Carbon AA R305 VRD RA2BE101J R 100 1 8W Carbon AB R306 VRS CY1JF000J R 0 1 16W Metal Oxide AA R308 VRD RA2BE101J R 100 1 8W Carbon AB R309 VRS CY1JF101J R 100 1 16W Metal Oxide AA R310 VRD RA2BE101J R 100 1 8W Carbon AB R311 VRS CY1JF272J R 2...

Page 75: ...l Oxide AA R2229 VRS CY1JF102J R 1k 1 16W Metal Oxide AA R2230 VRD RA2BE272J R 2 7k 1 8W Carbon AA R2231 VRS CY1JF104J R 100k 1 16W Metal Oxide AA R2232 VRS CY1JF101J R 100 1 16W Metal Oxide AA R2233 VRS CY1JF822J R 8 2k 1 16W Metal Oxide AA R2234 VRS CY1JF681J R 680 1 16W Metal Oxide AA R2235 VRS CY1JF153J R 15k 1 16W Metal Oxide AA R2236 VRD RA2BE331J R 330 1 8W Carbon AA R2237 VRS CY1JF822J R 8...

Page 76: ...J R 1k 1 16W Metal Oxide AA R7797 VRS CY1JF182J R 1 8k 1 16W Metal Oxide AA R7798 VRS CY1JF102J R 1k 1 16W Metal Oxide AA R7830 VRD RM2HD561J R 560 1 2W Carbon AA R7831 VRS CY1JF103J R 10k 1 16W Metal Oxide AA R7840 VRD RM2HD561J R 560 1 2W Carbon AA R7841 VRS CY1JF103J R 10k 1 16W Metal Oxide AA R7842 VRD RA2BE562J R 5 6k 1 8W Carbon AA R7843 VRD RA2BE562J R 5 6k 1 8W Carbon AA R7844 VRS CY1JF103...

Page 77: ...KA7809PI AE IC751 VHiSE115N 1 R SE115N AF TRANSISTORS Q601 VS2SC2482 1 R C2482 AD Q602 VS2SD2586 1E R D2586 AM Q603 VS2SC3198 G 1 R C3198 AA Q751 VS2SD1944K 1 R D1944K AE Q752 VS2SA1266 Y 1 R A1266 Y AA Q753 VSKTA1024 Y 1 R KTA1024 Y AD Q754 VS2SC2229O 1E R C2229O AD Q755 VSKTA1024 Y 1 R KTA1024 Y AD Q756 VS2SC2229O 1E R C2229O AD Q781 VSDTC144ES 1 R DTC144ES AB Q782 VS2SB1117KU1E R B1117KU AE Q78...

Page 78: ... 3W Metal Oxide AC R611 VRD RM2HD392J R 3 9k 1 2W Carbon AA R612 VRD RA2BE391J R 390 1 8W Carbon AA R613 VRD RA2BE102J R 1k 1 8W Carbon AA R614 VRW KQ3HC4R7K R 4 7 5W Cement AE å R615 RR XZ0073CEZZ R 270 1 2W Fuse Resistor AB R617 VRD RA2BE682J R 6 8k 1 8W Carbon AA R618 VRD RA2BE393J R 39k 1 8W Carbon AA R619 VRD RA2BE683J R 68k 1 8W Carbon AA R620 VRD RA2BE103J R 10k 1 8W Carbon AA R621 VRD RA2B...

Page 79: ...p 50V Ceramic AA C1303 VCKYPA1HB102K R 1000p 50V Ceramic AA C1304 VCKYPA1HB102K R 1000p 50V Ceramic AA C1307 VCKYPA1HB102K R 1000p 50V Ceramic AA C1308 VCKYPA1HB102K R 1000p 50V Ceramic AA C1309 VCKYPA1HF103Z R 0 01 50V Ceramic AA BALUN FB1401 RBLN 0014GEZZ R Balun BLN 0014GE AB MISCELLANEOUS PARTS CN1401 QCNW 2356PEZZ R Connecting Cord AF J1301 QJAKJ0061CEZZ R Jack AH J1401 QJAKF0040CEZZ R Jack A...

Page 80: ...HJZ31 08052 V Washer W3 1 5 2 0 8 AC CABINET AND MECHANICAL PARTS 1 CCABA2507WEV0 R Front Cabinet Ass y BE 1 1 Not Available Front Cabinet 1 2 HDECQ0109PESC R Punching Plate AD 1 3 HBDGB0018PESB R Badge SHARP AD 1 4 HDECQ0130PESA R VCR Flap AF 1 5 GCOVA0094PESA R LED Decoration AE 1 6 JBTN 0293PESC R Button Power AD 1 7 CBTN 0294WEV0 R Button Ass y VCR Control AQ 1 7 1 Not Available Button VCR Con...

Page 81: ...oof Lever R AE 307 MLEVP0281AJ00 V Door Open Lever AD 308 MSLiF0076AJFW V Slider AK 309 MSPRD0151AJFJ V Proof Lever R Spring AB 310 MSPRD0166AJFJ V Drive Gear R Spring AE 311 MSPRP0175AJFJ V Cassette Spring AE 312 MSPRT0381AJFJ V Double Action Spring AC 313 NGERH1278AJZZ V Drive Gear L AE 314 NGERH1309AJZZ V Drive Gear R AE 315 NGERR1008AJ00 V Double Action Rack Gear AE 316 NGERR3005AJFW V Drive A...

Page 82: ...HANICAL PARTS MECHANISM CHASSIS PARTS 22 31 12 20 18 214 19 29 49 51 8 11 203 49 51 7 58 52 4 25 24 2 33 15 1 50 218 207 67 207 63 62 66 66 66 53 65 216 41 61 21 38 17 208 60 47 44 6 30 36 9 39 45 219 10 30 40 27 43 46 43 35 35 37 34 23 62 48 209 210 211 212 213 223 5 26 32 68 69 55 16 202 222 221 201 202 202 220 59 70 57 71 56 ...

Page 83: ... AD 9 26 24 AO V 39 38 17 AV 25 A U K 17 PB W 17 G PC PA PB 25 Z 23 40 25 58 14 12 53 Y H 27 47 56 21 2 1 2 52 58 57 41 35 36 H K 6 37 37 18 7 24 26 S 1 12 1 17 1 20 1 1 1 10 1 14 1 2 1 3 1 6 1 10 1 19 1 18 1 8 1 5 1 9 1 19 1 7 1 1 7 1 9 22 22 AO 43 16 32 16 29 25 49 50 46 W F 26 15 55 41 44 42 U 25 37 V 33 22 22 F 20 PWB D 31 20 G Z 30 4 24 1 19 1 8 1 16 PWB F 1 15 1 7 2 23 10 1 4 1 11 PWB A PWB ...

Page 84: ... Part No Description Code Ref No Part No Description Code 114 37VT 26H GY A B C D E F G H 1 2 3 4 5 6 CASSETTE HOUSING CONTROL PARTS 301 300 304 311 308 311 305 306 309 303 312 316 315 307 314 310 317 313 302 ...

Page 85: ...DEO ADJUST 1ch 00 AUTO I ON RESET POWER MAIN SWITCH TAPE SPEED WOUND UP TIMER SLEEP TIMER CLOCK LAST POWER ON OFF NORMAL OFF OFF OFF Setting positions of the knobs REAR Packing Case Serial Number Label MARK Not replacement items Number Card FRONT Buffer Material Polystyrene Sack Polystyrene Bag Use 22 staples to fix the packing case Operation Manual Batteries Infrared R C unit ...

Page 86: ...ochigi 329 2193 Japan COPYRIGHT C 1999 BY SHARP CORPORATION ALL RIGHTS RESERVED No 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 TQ0749 S Sep 1999 Printed in JAPAN NA NS 37VT 26H GY ...

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