Sharp VC-A412U Service Manual Download

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Ref. No.

Part No.

★

Description

Code

Ref. No.

Part No.

★

Description

Code

VC-A412U/A413U
VC-H812U/H813U

R654

VRS-CY1JF682J

V 6.8k 1/16W Metal Oxide

(VC-H812U/H813U)

R655

VRS-CY1JF473J

V 47k

1/16W Metal Oxide

(VC-H812U/H813U)

R656

VRS-CY1JF682J

V 6.8k 1/16W Metal Oxide

(VC-H812U/H813U)

R657

VRS-CY1JF101J

V 100

1/16W Metal Oxide

(VC-H812U/H813U)

R658

VRS-CY1JF223J

V 22k

1/16W Metal Oxide

(VC-H812U/H813U)

R659

VRD-RA2BE681J

V 680

1/8W

Carbon

(VC-H812U/H813U)

R663

VRS-CY1JF473J

V 47k

1/16W Metal Oxide

(VC-H812U/H813U)

R664

VRS-CY1JF682J

V 6.8k 1/16W Metal Oxide

(VC-H812U/H813U)

R665

VRS-CY1JF473J

V 47k

1/16W Metal Oxide

(VC-H812U/H813U)

R666

VRS-CY1JF682J

V 6.8k 1/16W Metal Oxide

(VC-H812U/H813U)

R667

VRD-RA2BE101J

V 100

1/8W

Carbon

(VC-H812U/H813U)

R668

VRS-CY1JF223J

V 22k

1/16W Metal Oxide

(VC-H812U/H813U)

R669

VRD-RA2BE681J

V 680

1/8W

Carbon

(VC-H812U/H813U)

R670

VRS-CY1JF273J

V 27k

1/16W Metal Oxide

(VC-H812U/H813U)

R671

VRS-CY1JF103J

V 10k

1/16W Metal Oxide

(VC-H812U/H813U)

R672

VRS-CY1JF151J

V 150

1/16W Metal Oxide

(VC-H812U/H813U)

R673

VRS-CY1JF151J

V 150

1/16W Metal Oxide

(VC-H812U/H813U)

R674

VRS-CY1JF473J

V 47k

1/16W Metal Oxide

(VC-H812U/H813U)

R675

VRS-CY1JF183J

V 18k

1/16W Metal Oxide

(VC-H812U/H813U)

R676

VRS-CY1JF102J

V 1k

1/16W Metal Oxide

(VC-H812U/H813U)

R677

VRS-CY1JF473J

V 47k

1/16W Metal Oxide

(VC-H812U/H813U)

R685

VRS-CY1JF102J

V 1k

1/16W Metal Oxide

(VC-H812U/H813U)

R686

VRS-CY1JF102J

V 1k

1/16W Metal Oxide

(VC-H812U/H813U)

R690

VRS-CY1JF000J

V 0

1/16W Metal Oxide

(VC-H812U/H813U)

R703

VRD-RA2BE102J

V 1k

1/8W

Carbon

R704

VRD-RA2BE102J

V 1k

1/8W

Carbon

R705

VRD-RA2BE102J

V 1k

1/8W

Carbon

R706

VRS-CY1JF153J

V 15k

1/16W Metal Oxide

R707

VRS-CY1JF153J

V 15k

1/16W Metal Oxide

R708

VRS-CY1JF102J

V 1k

1/16W Metal Oxide

R709

VRS-CY1JF102J

V 1k

1/16W Metal Oxide

(VC-H812U/H813U)

R710

VRS-CY1JF473J

V 47k

1/16W Metal Oxide

R711

VRS-CY1JF473J

V 47k

1/16W Metal Oxide

R712

VRS-CY1JF223J

V 22k

1/16W Metal Oxide

R714

VRS-CY1JF332J

V 3.3k 1/16W Metal Oxide

R715

VRS-CY1JF102J

V 1k

1/16W Metal Oxide

R716

VRS-CY1JF102J

V 1k

1/16W Metal Oxide

R717

VRS-CY1JF681J

V 680

1/16W Metal Oxide

R718

VRS-CY1JF182J

V 1.8k 1/16W Metal Oxide

R719

VRD-RA2BE102J

V 1k

1/8W

Carbon

R720

VRS-CY1JF822J

V 8.2k 1/16W Metal Oxide

(VC-A412U/A413U)

R722

VRD-RA2BE102J

V 1k

1/8W

Carbon

R723

VRS-CY1JF000J

V 0

1/16W Metal Oxide

R725

VRD-RA2BE104J

V 100k 1/8W

Carbon

(VC-A412U/A413U)

R725

VRD-RA2BE183J

V 18k

1/8W

Carbon

(VC-H812U/H813U)

R726

VRS-CY1JF103J

V 10k

1/16W Metal Oxide

R727

VRD-RA2EE151J

V 150

1/4W

Carbon

R202

VRS-CY1JF182J

V 1.8k 1/16W Metal Oxide

R203

VRS-CY1JF682J

V 6.8k 1/16W Metal Oxide

R207

VRS-CY1JF101J

V 100

1/16W Metal Oxide

R211

VRS-CY1JF153J

V 15k

1/16W Metal Oxide

R212

VRS-CY1JF153J

V 15k

1/16W Metal Oxide

R225

VRS-CY1JF750J

V 75

1/16W Metal Oxide

R226

VRS-CY1JF101J

V 100

1/16W Metal Oxide

R227

VRS-CY1JF750J

V 75

1/16W Metal Oxide

R228

VRS-CY1JF750J

V 75

1/16W Metal Oxide

R229

VRD-RA2BE101J

V 100

1/8W

Carbon

R252

VRD-RA2EE331J

V 330

1/4W

Carbon

R253

VRS-CY1JF101J

V 100

1/16W Metal Oxide

R254

VRS-CY1JF101J

V 100

1/16W Metal Oxide

R256

VRS-CY1JF183J

V 18k

1/16W Metal Oxide

R301

VRS-CY1JF473J

V 47k

1/16W Metal Oxide

R313

VRS-CY1JF332J

V 3.3k 1/16W Metal Oxide

R315

VRS-CY1JF152J

V 1.5k 1/16W Metal Oxide

R330

VRS-CY1JF222J

V 2.2k 1/16W Metal Oxide

R331

VRS-CY1JF102J

V 1k

1/16W Metal Oxide

R351

VRS-CY1JF102J

V 1k

1/16W Metal Oxide

(VC-H812U/H813U)

R501

VRS-CY1JF681J

V 680

1/16W Metal Oxide

R502

VRS-CY1JF273J

V 27k

1/16W Metal Oxide

R505

VRS-CY1JF000J

V 0

1/16W Metal Oxide

R511

VRS-CY1JF272J

V 2.7k 1/16W Metal Oxide

(VC-H812U/H813U)

R512

VRS-CY1JF272J

V 2.7k 1/16W Metal Oxide

(VC-H812U/H813U)

R520

VRS-CY1JF154J

V 150k 1/16W Metal Oxide

(VC-H812U/H813U)

R521

VRS-CY1JF473J

V 47k

1/16W Metal Oxide

(VC-H812U/H813U)

R601

VRS-CY1JF822J

V 8.2k 1/16W Metal Oxide

R602

VRS-CY1JF274J

V 270k 1/16W Metal Oxide

R603

VRS-CY1JF221J

V 220

1/16W Metal Oxide

R604

VRS-CY1JF473J

V 47k

1/16W Metal Oxide

R605

VRS-CY1JF153J

V 15k

1/16W Metal Oxide

R606

VRS-CY1JF273J

V 27k

1/16W Metal Oxide

R607

VRS-CY1JF561J

V 560

1/16W Metal Oxide

R608

VRS-CY1JF472J

V 4.7k 1/16W Metal Oxide

R609

VRS-CY1JF333J

V 33k

1/16W Metal Oxide

(VC-A412U/A413U)

R610

VRS-CY1JF183J

V 18k

1/16W Metal Oxide

(VC-A412U/A413U)

R611

VRS-CY1JF153J

V 15k

1/16W Metal Oxide

(VC-H812U/H813U)

R611

VRS-CY1JF393J

V 39k

1/16W Metal Oxide

(VC-A412U/A413U)

R612

VRS-CY1JF123J

V 12k

1/16W Metal Oxide

(VC-A412U/A413U)

R612

VRS-CY1JF823J

V 82k

1/16W Metal Oxide

(VC-H812U/H813U)

R613

VRS-CY1JF393J

V 39k

1/16W Metal Oxide

(VC-A412U/A413U)

R614

VRS-CY1JF123J

V 12k

1/16W Metal Oxide

(VC-A412U/A413U)

R615

VRS-CY1JF472J

V 4.7k 1/16W Metal Oxide

(VC-A412U/A413U)

R616

VRS-CY1JF103J

V 10k

1/16W Metal Oxide

(VC-A412U/A413U)

R617

VRS-CY1JF103J

V 10k

1/16W Metal Oxide

(VC-H812U/H813U)

R618

VRS-CY1JF563J

V 56k

1/16W Metal Oxide

R619

VRS-CY1JF470J

V 47

1/16W Metal Oxide

R620

VRS-CY1JF153J

V 15k

1/16W Metal Oxide

R621

VRD-RA2EE4R7J

V 4.7

1/4W

Carbon

R623

VRS-CY1JF393J

V 39k

1/16W Metal Oxide

R624

VRS-CY1JF224J

V 220k 1/16W Metal Oxide

R626

VRS-CY1JF000J

V 0

1/16W Metal Oxide

R627

VRS-CY1JF332J

V 3.3k 1/16W Metal Oxide

R628

VRS-CY1JF000J

V 0

1/16W Metal Oxide

(VC-A412U/A413U)

R653

VRS-CY1JF473J

V 47k

1/16W Metal Oxide

(VC-H812U/H813U)

Summary of Contents for VC-A412U

Page 1: ...to its original condition and only parts identical to those specified be used MODELS VC A412U A413U H812U Models for Canada VC A412U A413U H812U H813U Models for U S A VC A413U H813U VC A412U H812U Page 1 GENERAL INFORMATION 5 2 DISASSEMBLY AND REASSEMBLY 7 3 FUNCTION OF MAJOR MECHANICAL PARTS 10 4 ADJUSTMENT REPLACEMENT AND ASSEMBLY OF MECHANICAL UNITS 12 5 ELECTRICAL ADJUSTMENT 31 6 MECHANISM OP...

Page 2: ...ic control knobs insulation materials cabinet backs adjustment and compartment covers or shields isola tion resistor capacitor networks mechanical insula tors etc 3 To be sure that no shock hazard exists check for current in the following manner Plug the AC line cord directly into a 120 volt AC outlet Do not use an isolation transformer for this test Using two clip leads connect a 1 5k ohm 10 watt...

Page 3: ...nt le dos du coffret les couvercles de compartiment et ajustement ou les boucliers les réseauxderésistance condensateurd isolement Ies isolateurs mécaniques etc 3 Pourêtresûrqu iln yaaucunrisquedechocélectrique vérifier le courant de fuite de la maniére suivante Brancherlecordond alimentationsecteurdirectement dansuneprisedecourantde120volts Nepasutiliser de transformateur d isolement pour cet ess...

Page 4: ...f part with the mechanism and its PWB in position in the main frame 1 Start and end sensors Q701 and Q702 Insert the sensor s projection deep into the upper hole of the holder Referring to the PWB fix the sensors tight enough 2 Photocoupler IC901 Refer to the symbol on the PWB and the anode marking of the part 3 Cam switches A and B D708 and D709 Adjust the notch of the part to the white marker of...

Page 5: ...Format VHS NTSC Standard Video Recording System Rotary Slant Azimuth Two Head Helical Scan Number of Video Heads 4 Video Signal Standard NTSC Color System Audio Recording System 1 Stationary Head for Linear Audio 2 Rotary Heads for Hi Fi stereo Only Hi Fi models Tape Width 12 7 mm 1 2 inch Tape Speed SP 33 35 mm sec 1 31 i p s LP 16 67 mm sec 0 66 i p s playback only EP 11 12 mm sec 0 44 i p s Max...

Page 6: ...6 VC A412U A413U VC H812U H813U 1 3 LOCATION OF MAJOR COMPONENTS AND CONTROL ...

Page 7: ...vebutton2 VC A412U H812U Remove 2 screws 3 and 7 clips 4 OPERATION Remove 1 screw 5 PWB SHIELD ANGLE Remove 1 screw 6 with shield angle MECHANISM Remove 1 screw 7 1 screw 8 2 MAIN PWB screws 9 2 screws 0 Remove 1 screw q with antenna terminal cover Remove 1 screw w with top cabinet fix angle MAIN FRAME FRONT PANEL FRONT PANEL OPERATION PWB TOP CABINET FIX ANGLE TOP CABINET SHIELD ANGLE MECHANISM M...

Page 8: ... and remove the antenna cover Remove the PWB bottom plate 1 screw 2 Remove the FFC cable AA AD AH 3 which connect ing the PWB and the mechanism Take out vertically the mechanism so that it does not damage the adjacent parts 2 Removing the mechanism and cassette housing Remove 2 screws 4 fixing the cassette housing to the mechanism and remove the cassette housing 2 1 3 4 CASSETTE HOUSING MAIN PWB ...

Page 9: ...itial set position 1 install the cassette housing in the specified position This method is applied only for the mechanism INSTALLING THE MECHANISM ON PWB Lower vertically the mechanism paying attention to the mechanism edge and install the mechanism with due care so that the parts are not damaged So as to fix the mecha nism to the main PWB install two housings Fit the antenna cover to one of them ...

Page 10: ... Supply pole base ass y 3 Tension arm 4 Idler wheel ass y 5 Pinch drive lever ass y 6 Supply reel disk 7 Supply main brake 8 Take up main brake 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 17 15 10 11 5 9 14 12 8 16 13 4 6 2 7 3 1 18 ...

Page 11: ... PARTS BOTTOM VIEW No Function No Function 15 Drum ass y 16 Loading motor 17 Drum drive motor 18 Take up pole base ass y 19 Slow brake lever 20 Master cam 21 Capstan D D motor 22 Reel belt 23 Clutch lever 24 Limiter pulley ass y 26 Shifter 26 24 21 22 19 20 12 23 ...

Page 12: ...g any part to the threaded hole using resin with screw use the jig Specified torque 5 kg This cassette torque meter is used for check ing and adjusting 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 Master Plane Jig and Reel Disk Height Adjusting Jig Pinch pressing force measuring jig This Jig is used...

Page 13: ...ct part 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 4 2 MAINTENANCE CHECK ITEMS AND EXECUTIO...

Page 14: ... not contact the guide pin or drum 5 After installing the cassette housing control once per form cassette loading operation 4 4 TORUNATAPEWITHOUTTHECASSETTE HOUSING CONTROL ASSEMBLY 1 Remove the full surface panel 2 Short circuit TP803 and TP802 3 Plug in the power cord 4 Turn off the power switch The pole bases move into U L position 5 Open the lid of a cassette tape by hand 6 Hold the lid with t...

Page 15: ...not adhere the brake surface 2 After reassembly check the video search rewind back tension see 4 10 and check the brake torque see 4 14 Height checking and adjustment Note 1 Set the master plane with due care so that it does not contact the drum 2 When putting the master plane shift the reverse guide a little in the loading direction Care must be taken since excessive shift results in damage Figur...

Page 16: ...hort circuiting TP803 and TP802 provided at operation PWB plug in the power cord Setting 1 Set a torque gauge to zero on the scale Place it on the take up reel disk 2 Press the FF button 3 To calculate the remaining capacity of the play back mode slowly rotate the supply reel disk and then shift it into the forward mode Checking 1 Turn the torque gauge slowly one rotation every 2 to 3 seconds by h...

Page 17: ...t counterclockwise very slowly one rotation every 1 to 2 seconds and check that the torque is within the set value 14 0 3 9mN m 144 40gf cm Figure 4 11 Note Surely put the torque gauge on the reel disk to measure If the torque gauge is raised accurate measurement is impossible Adjustment If the rewinding playback winding up torque is not within the setting replace the limiter pulley assembly Note ...

Page 18: ... CHECKING THE VIDEO SEARCH REWIND BACK TENSION Remove the cassette housing control assembly After short circuiting TP803 and TP802 provided at operation PWB plug in the power cord Checking 1 After pressing the play button press the rewind button and set the video search rewind mode 2 Place the torque gauge on the take up reel disk and turn it counterclockwise very slowly one rotation every 2 to 3 ...

Page 19: ...left right 4 13 CHECKING AND ADJUSTMENT OF RECORD PLAYBACK BACK TENSION Remove the cassette housing control assembly After short circuiting TP803 and TP802 provided at operation PWB plug in the power cord Setting 1 Turn off the power switch 2 Open the torque cassette meter and fix with tape 3 Set the cassette tape in loading state 4 Put the weight 500g on the cassette torque meter 5 Turn on the po...

Page 20: ...entofthebraketorqueatthesupplysideandthe take up side Unless the supply side brake torque or take up side brake torque is within the setting clean the felt surface of reel disk supply take up brake lever check again the brake torque If value cannot be set within the setting yet replace the main brake ass y or main brake spring Figure 4 20 4 14 CHECKING THE BRAKE TORQUE Checking the brake torque at...

Page 21: ...bly 2 In unloading state unplug the power cord Removal 1 Remove the screws123 Azimuth screw Tilt screw 2 Unsolder the PWB fitted to the A C head Notes 1 When replacing never touch the head If you touched clean with the cleaning liquid 2 When removing the screw 3 take care so that the spring may out New A C head ass y A C head PWB 2 Spring 1 Solder Never touch the head 10 8mm 10 8mm Azimuth screw H...

Page 22: ...uide lower flange to 13 38 mm using the reverse guide height adjustment jig in tape loading state Refer to Figure 4 28 a b Figure 4 29 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 refer to Figure 4 30 a b Figure 4 28 2 Rotate counterclockwise the reverse guide heigh...

Page 23: ...wise so that tape crease appears once at the flange and then return the tilt screw so that the crease disappears 2 If there is tape crease Turn counterclockwise the tilt screw so that the tape crease disappears Reference If the tilt screw is turned clockwise crease appears at the lower flange Guide roller Weight of 500g Cassette Tape 2 Adjustment of A C head height and azimuth 1 Perform the initia...

Page 24: ...Refer to the electric adjustment method 6 Playback the self picture recorded tape and check the flatness of envelope waveform and sound Notes When the A C head X value adjustment is performed be sure to perform at first X value rough adjustment refer to 4 18 3 2 PB CHROMA Envelope CH 1 CH 2 Head switching pulse Figure 4 34 4 A C head X value adjustment 1 Tentatively fix A C head arm screws 1 and 2...

Page 25: ...allation adjust the playback switching point for adjustment of servo circuit 4 19 REPLACEMENT OF THE CAPSTAN D D DIRECT DRIVE MOTOR Remove the mechanism from the main PWB refer to 2 2 item 1 When removing the mechanism from the main PWB Removal Follow the order of indicated numbers 1 Remove the reel belt 1 2 Remove the three screws 2 Figure 4 37 Reassembly 1 Taking care so that the capstan shaft d...

Page 26: ...THE UPPER AND LOWER DRUM ASSEMBLY Replacement Perform in the numerical order 1 Remove the motor as stated in4 20 D D motor replace ment 2 Remove the drum earth brush ass y 2 3 Remove the drum base 3 from the upper and lower drum assembly 1 Cares when replacing the drum 1 Be careful so that the drum earth brush is not lost 2 Do not touch directly the drum surface 3 Fit gently the screwdriver to the...

Page 27: ...n Lever Ass y 3Insert Open Lever Insert reverse guide lever ass y Align here 2 Insert pinch drive cam Pinch drive lever ass y 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 counterc...

Page 28: ...3 3 For the phase matching at the insert point 1 see the Phase Matching point 2 as shown below 4 Finally fix the inserts 1 and 4 Capstan D D motor Drum Reel pulley Bottom side of mechanism chassis Sifter Phase Matching point 2 Insert point 1 Half round notch Shaft 1 Round mark Loading gear T Insert point 3 Insert point 4 Insert point 5 Release point 3 Phase matching point 1 Shaft 1 Shaft 1 Shaft 4...

Page 29: ...lacement Remove the loading motor and install the replacement loading motor as shown below Figure 4 46 Figure 4 44 2 Wheninstallingthemastercam align the casecon drive gear round mark with the half round notch of master cam The loading motor pressing in must be less than 14 7 N 1 500 gf Adjust the distance between motor and pulley to 10 2 mm E ring XRESJ30 06000 Master cam Fully turn clockwise Ful...

Page 30: ...L and Drive Gear R 4 26 ASSEMBLY OF CASSETTE HOUSING 1 Drive Gear and R Drive angle ass y Figure 4 47 MSPRT0381AJFJ Apply grease Apply grease Apply grease LANGF9592AJFW Top surface should be free from scratches or soil Drive angle Drive gear R Frame Figure 4 48 ...

Page 31: ... video heads Check that the mechanism and all electric components are in good working condition prior to the adjustments otherwise adjustments can not be completed Instruments required Color TV monitor Dual trace oscilloscope Audio signal generator AC milli voltmeter Blank video cassette tape Alignment tape VROEFZHS Screwdriver for adjustment Color bar generator RF signal generator P201 TP201 204 ...

Page 32: ...Short circuit between TP801 and TP802 on the opera tion PWB to center tracking 3 Press the tracking buttons or 20 times each to bring the tracking off center Make sure that 1 There is nothing unusual on the playback screen 2 There is nothing unusual in the Hi Fi sound for the Hi Fi models only 4 Press the STOP button to quit test mode Note Self recorded tape is a cassette whose program was re cord...

Page 33: ...otor 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 before cassette insertion Insert cassette Double action rack slides Drum motor starts Tap...

Page 34: ...stops End Stop capstan motor NO YES Press STILL key Pinch roller releasing Idler swinging Pinch roller pressing Loading motor turns clockwise and master cam counterclockwise Turn capstan motor in reverse direction Turn loading motor counterclockwise Cam switch is at VSR position Set capstan motor to search speed Is take up reel sensor signal outputted Press REW key Release pinch roller Cam switch ...

Page 35: ...r Loading motor stops End Loading motor turns in clockwise and master cam counterclockwise 4 supply reel pulses outputted 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 c...

Page 36: ... system in trouble Does capstan motor turn in FF or REW direction Are idler wheel ass y and reel disk in mesh Is the pulse outputted from reel sensor The cassette tape is presumably damaged 2 REC PLAY FAILURE MODE RELEASE 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 Loading motor control ...

Page 37: ... reel disk in mesh Is supply reel disk winding torque normal Is pulse outputted 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 unusal sound heard during cassette control running Unusual sound heard with pinch roller lever going up or down Is unusual sound heard during loading unloading ...

Page 38: ...ap found at reel disk Drive system out of contact with any part on main PWB Turn capstan motor by hand 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 ...

Page 39: ...ase 2 Check for leak or short circuiting of primary circuit part L901 D901 904 T901 C906 R904 Q901 902 etc Check for short circuiting of rectifying diode and circuit in each rectifying circuit of secondary circuit D921 928 FLOW CHART NO 4 When buzz is heard from the vicinity of power circuit Check for short circuiting of circuit and rectifying diode of each rectifying circuit of secondary circuit ...

Page 40: ...shutter go to open when the cassette tape is inserted NO NO NO FLOW CHART NO 9 A cassette tape is taken in but ejected at once Does the start sensor pulse at pin 79 of IC701 change from L to H level when the cassette tape is loaded Check start sensor and all the way up thru to IC701 Does the end sensor pulse at pin 85 of IC701 change from L to H level when the cassette tape is loaded Check end sen...

Page 41: ... NO NO NO NO NO NO YES YES YES NO NO NO FLOW CHART NO 11 No power is turned on Does power control H signal at pin 4 of IC701 change from L to H level Check IC701 Does the base of Q951 change from about 5 0V to 4 5V Check IC701 and all the way up thru to Q951 Is 5V sent out of the collector of Q951 Check Q951 and the AT 5V line Check peripheral circuits for poor soldering FLOW CHART NO 12 The capst...

Page 42: ...drum motor rotating Is the drum PG signal and drum FG signal present on pins 66 and 65 of IC701 respectively Are there drum PG M M signal at pin 81 of IC701 Check C723 and readjust R701 HEAD SW POINT control Could be lines between IC706 and IC701 Check peripheral circuit of IC706 Are the drum PG and drum FG signals present on pins 7 and 8 of IC706 Replace IC701 Check or replace drum motor Check li...

Page 43: ...k peripheral circuit of pin 50 of IC701 C770 C771 and R770 Check drum FG signal line Is the head switching pulse at pin 23 of IC701 present NO See FLOW CHART NO 15 YES YES Is the drum APC output at pin 34 of IC701 and drum AFC output at pin 32 of IC701 present NO Replace IC701 YES YES Is the drum control voltage applied to pin 2 of IC706 YES Is pin 46 of IC701 in high impedance NO YES NO Check lin...

Page 44: ...of IC701 Replace IC701 Replace A C head YES YES YES NO NO NO Is there capstan AFC signal at pin 31 of IC701 NO NO NO Is there capstan APC signal at pin 33 of IC701 YES NO Replace IC701 Does PB CTL signal appear at pin 76 of IC701 Replace IC701 Is there REC CTL signal output at pins 75 and 74 of IC701 Does PB CTL signal appear at pin 76 of IC701 Does A C head operate normally Adjust the height of t...

Page 45: ... pin 49 of IC701 Is picture signal output to the pin 47 of IC701 Check the line between pin 52 of IC201 and pin 49 of IC701 Check the line between pins 63 and 62 of IC201 and pins 56 and 57 of IC701 Is picture signal output to the emitter of video output buffer Q251 1 Line output Check Q251 periphery and output terminal periphery 2 RF output Check Q251 periphery and tuner pin 6 periphery Is 5V app...

Page 46: ...f IC201 Check C212 Check between the pins 24 and 23 of IC201 Check C210 Is voltage 5V applied to the CCD section power terminal pin 36 of IC201 Is CCD control voltage approx 5V applied normally to the pin 37 from the pin 57 of IC201 Is clock signal approx 7 16 MHz 0 5 Vp p for CCD applied normally to the pin 44 from the pin 69 of IC201 Check the pins 13 and 14 of IC201 peripheral circuit R201 R202...

Page 47: ...201 Is luminance signal approx 0 5 Vp p input to the pin 39 of IC201 Check between the pin 39 and pin 26 of IC201 Check C212 Check between the pin 21 and pin 42 of IC201 Check C208 Check between the pin 18 and pin 19 of IC201 Check C206 Check between the pin 55 and pin 54 of IC201 Check C514 Check between the pins 79 and 78 of IC201 Is the luminance signal approx 0 25 Vp p input and output to the ...

Page 48: ... pins 53 and 57 of IC651 RF output terminal Is there audio signal outputted at pin 59 of IC651 Replace IC651 No Hi Fi E E sound heard pin 48 Hi Fi sound cannot be recorded E E mode is normal YES NO YES YES NO NO NO Is record FM signal output to the pins 21 to 24 ch 1 pins 21 and 22 ch 2 of IC651 Check the AH MZ connector Is the pin 29 of IC651 about 3 7V Check line of Hi Fi 5V Check Hi Fi REC CTL ...

Page 49: ...ht adjusted properly Replace the AC head Readjust the A C head height Is audio signal output to the pin 11 of IC201 YES YES YES YES YES YES NO NO NO NO Is it possible to confirm the audio signal PB EQ on the pin 100 of IC201 Replace IC201 Is the pin 99 of IC201 in L level Check the line between the pin 11 of IC201 to the pin 62 of IC651 FLOW CHART NO 27 Check the periphery of pin 99 of IC201 R617 ...

Page 50: ...VC A412U A413U VC H812U H813U VC A412U A413U VC H812U H813U 50 51 8 BLOCK DIAGRAM SYSTEM SERVO BLOCK DIAGRAM ...

Page 51: ...A413U VC H812U H813U 52 53 SIGNAL FLOW BLOCK DIAGRAM VC A412U A413U E E signal E E signal Audio Audio playback signal Audio recording signal Playback chroma signal Recording chroma signal Playback luminance signal Recording luminance signal ...

Page 52: ...A413U VC H812U H813U 54 55 SIGNAL FLOW BLOCK DIAGRAM VC H812U H813U E E signal E E signal Audio Audio playback signal Audio recording signal Playback chroma signal Recording chroma signal Playback luminance signal Recording luminance signal ...

Page 53: ...56 VC A412U A413U VC H812U H813U POWER CIRCUIT BLOCK DIAGRAM ...

Page 54: ...ted K 1000 ohms M 1 Meg ohm 2 All resistors are 1 8 watt unless otherwise noted 3 All capacitors µF unless otherwise noted P µµF Voltages and waveform are measured as follows DC voltages are measured with an SSVM placed between points indicated and chassis ground with the supply voltage of 120V AC and all controls for normal positions Thiscircuitdiagramisastandardone actualcircuits printed may be ...

Page 55: ...3U VC A412U A413U VC H812U H813U 58 59 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 VOLTAGE MEASUREMENT MODE PB Parentheses REC Without Parentheses 9 SCHEMATIC DIAGRAM AND PWB FOIL PATTERN MAIN CIRCUIT 1 ...

Page 56: ...U A413U VC H812U H813U VC A412U A413U VC H812U H813U 60 61 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 VOLTAGE MEASUREMENT MODE PB Parentheses REC Without Parentheses MAIN CIRCUIT 2 ...

Page 57: ...U A413U VC H812U H813U VC A412U A413U VC H812U H813U 62 63 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 VOLTAGE MEASUREMENT MODE PB Parentheses REC Without Parentheses MAIN CIRCUIT 3 ...

Page 58: ...U A413U VC H812U H813U VC A412U A413U VC H812U H813U 64 65 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 VOLTAGE MEASUREMENT MODE PB Parentheses REC Without Parentheses MAIN CIRCUIT 4 ...

Page 59: ...66 VC A412U A413U VC H812U H813U VOLTAGE MEASUREMENT MODE PB Parentheses REC Without Parentheses OPERATION CIRCUIT A B C D E F G H I J 1 2 3 4 5 6 7 8 9 10 ...

Page 60: ...67 VC A412U A413U VC H812U H813U A B C D E F G H I J 1 2 3 4 5 6 7 8 9 10 PWB FOIL PATTERN OPERATION PWB Component Side Wiring Side ...

Page 61: ...VC A412U A413U VC H812U H813U VC A412U A413U VC H812U H813U 68 69 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 MAIN PWB Component Side ...

Page 62: ...VC A412U A413U VC H812U H813U VC A412U A413U VC H812U H813U 70 71 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 MAIN PWB Wiring Side ...

Page 63: ...72 VC A412U A413U VC H812U H813U M E M O ...

Page 64: ...431 AE TRANSISTORS Q251 VS2SA1530ARS1 V 2SA1530ARS AC Q302 VS2SD1306 E1E V 2SD1306 E AD Q306 VS2SA1530ARS1 V 2SA1530ARS AC Q501 VS2SC3052EF 1 V 2SC3052EF AC VC H812U H813U Q602 VS2SD1859TV 1 V 2SD1859TV AD or Q602 VS2SC3939SQR 1 V SC3939SQR AC Q603 VS2SC3052EF 1 V 2SC3052EF AC De nombreuses pièces électriques et mécaniques de magnétosco pes présentent des caractéristiques particulières de sécurité...

Page 65: ...C H812U H813U C161 VCKYCY1CB104K V 0 1 16V Ceramic AB VC H812U H813U C162 VCKYCY1CB473K V 0 047 16V Ceramic AA VC H812U H813U Q651 VS2SD1306 E1E V 2SD1306 E AD VC H812U H813U Q652 VS2SD1306 E1E V 2SD1306 E AD VC H812U H813U Q653 VSKRA104S 1 V KRA104S AA VC H812U H813U Q654 VSKRC103S 1 V KRC103S AA VC H812U H813U Q656 VSKRC103S 1 V KRC103S AA VC H812U H813U Q704 VS2SA1530ARS1 V 2SA1530ARS AC Q705 V...

Page 66: ...CKYCY1CF224Z V 0 22 16V Ceramic AA VC H812U H813U C673 VCEA9M0JW226M V 22 6 3V Electrolytic AB VC H812U H813U C163 VCEA9M1HW474M V 0 47 50V Electrolytic AB VC H812U H813U C164 VCKYCY1CB104K V 0 1 16V Ceramic AB VC H812U H813U C165 VCKYCY1CB104K V 0 1 16V Ceramic AB VC H812U H813U C166 VCKYCY1CB273K V 0 027 16V Ceramic AA VC H812U H813U C167 VCKYCY1CB104K V 0 1 16V Ceramic AB VC H812U H813U C168 VC...

Page 67: ... 16W Metal Oxide AA VC A412U A413U R111 VRS CY1JF153J V 15k 1 16W Metal Oxide AA R112 VRS CY1JF153J V 15k 1 16W Metal Oxide AA R145 VRS CY1JF000J V 0 1 16W Metal Oxide AA VC H812U H813U R201 VRS CY1JF682J V 6 8k 1 16W Metal Oxide AA C674 VCKYCY1CF224Z V 0 22 16V Ceramic AA VC H812U H813U C675 VCKYCY1CF104Z V 0 1 16V Ceramic AA VC H812U H813U C677 VCEA9M1CW106M V 10 16V Electrolytic AB VC H812U H81...

Page 68: ...1JF182J V 1 8k 1 16W Metal Oxide AA R203 VRS CY1JF682J V 6 8k 1 16W Metal Oxide AA R207 VRS CY1JF101J V 100 1 16W Metal Oxide AA R211 VRS CY1JF153J V 15k 1 16W Metal Oxide AA R212 VRS CY1JF153J V 15k 1 16W Metal Oxide AA R225 VRS CY1JF750J V 75 1 16W Metal Oxide AA R226 VRS CY1JF101J V 100 1 16W Metal Oxide AA R227 VRS CY1JF750J V 75 1 16W Metal Oxide AA R228 VRS CY1JF750J V 75 1 16W Metal Oxide A...

Page 69: ...825 VRS CY1JF822J V 8 2k 1 16W Metal Oxide AA R826 VRS CY1JF103J V 10k 1 16W Metal Oxide AA R831 VRD RA2BE101J V 100 1 8W Carbon AB R832 VRS CY1JF103J V 10k 1 16W Metal Oxide AA R833 VRS CY1JF103J V 10k 1 16W Metal Oxide AA R839 VRD RA2BE102J V 1k 1 8W Carbon AA VC H812U H813U R841 VRD RA2BE183J V 18k 1 8W Carbon AA R843 VRD RA2BE474J V 470k 1 8W Carbon AA R845 VRD RA2BE474J V 470k 1 8W Carbon AA ...

Page 70: ...AJZZ V Switch Play AB VC A413U H813U S890 QSW K0086GEZZ J Switch Rew AC or VC A413U H813U S890 QSW K0004AJZZ V Switch Rew AB VC A413U H813U MISCELLANEOUS PART P881 QPLGZ0626CEZZ V Plug 6 Pin AF MECHANISM CHASSIS PARTS 1 LBNDK1011AJZZ V Tension Band Ass y AH 2 LBOSZ1007AJZZ V Tension Arm boss AD 4 LBOSZ1006AJZZ V Cassette Stay L AD 5 LCHSM0174AJZZ V Main Chassis Ass y AV 6 LHLDZ2016AJZZ V Loading M...

Page 71: ...ring 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 Angle Gear AG 317 NSFTD0041AJFD V Main Shaft AH CABINET PARTS 600 GCABA3136AJSM V Top Cabinet AT 601 GCABB1223AJKB V Main Frame AQ 602 GCOVA2072AJKZ V Antenna Terminal Cover AE VC A412U A413U 602 GCOVA20...

Page 72: ...G0235AJSC V Infrared Remote Control AZ Unit QCNW 8115AJZZ V 75 Ohm Coaxial Cable AG or QCNW 0322AJZZ V 75 Ohm Coaxial Cable AM ACCESSORY NOT REPLACEMENT ITEM TGAN 0001AJZZ Warranty Card U S A Only PACKING PARTS NOT REPLACEMENT ITEM SPAKC4260AJZZ Packing Case VC H813U SPAKC4261AJZZ Packing Case VC A413U SPAKC4264AJZZ Packing Case VC H812U SPAKC4266AJZZ Packing Case VC A412U SPAKX1073AJZZ Packing Ad...

Page 73: ...EW OF MECHANICAL PARTS MECHANISM CHASSIS PARTS 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 53 216 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 48 209 210 211 212 213 223 5 26 68 69 55 16 222 221 201 202 202 220 59 70 57 71 56 32 22 63 62 66 66 66 66 65 62 224 ...

Page 74: ...Description Code Ref No Part No Description Code 83 VC A412U A413U VC H812U H813U CASSETTE HOUSING CONTROL PARTS A B C D E F G H 1 2 3 4 5 6 301 304 311 311 305 306 309 303 312 316 315 307 314 310 317 313 302 308 300 ...

Page 75: ... Description Code 84 VC A412U A413U VC H812U H813U CABINET PARTS A B C D E F G H 1 2 3 4 5 6 B C C B 600 609 615 602 612 605 604 603 607 608 616 610 614 606 601 615 609 613 605 A VC H812U H813U VC A412U A413U VC A412U A413U VC H812U H813U 615 602 A ...

Page 76: ...bend the cover 5 Draw out the left side rod Do not mount the front panel with the cassette cover tilted too open Otherwise the cassette covermightwronglyrun onthecassettehousing Keep the cassette over about 45 open and make sure that the cassette cover open le ver is between the front panel and the cassette cover Now fix the front panel in place Before attaching the front panel in position make su...

Page 77: ...lightly bend the cover 5 Draw out the left side rod Do not mount the front panel with the cassette cover tilted too open Otherwise the cassette covermightwronglyrun onthecassettehousing Keep the cassette over about 45 open and make sure that the cassette cover open le ver is between the front panel and the cassette cover Now fix the front panel in place Before attaching the front panel in position...

Page 78: ...ry Battery SPAKC4260AJZZ VC H813U SPAKC4261AJZZ VC A413U SPAKC4266AJZZ VC A412U SPAKC4264AJZZ VC H812U Packing Case SPAKX1083AJZZ VC A413U H813U SPAKX1073AJZZ VC A412U H812U Packing Add QCNW 8115AJZZ or QCNW 0322AJZZ 75 ohm Coaxial Cable Accessories TiNS 3738AJZZ Operation Manual for U S A TiNS 3757AJZZ Operation Manual for Canada TGAN 0001AJZZ Warranty Card U S A Only RRMCG0235AJSB or RRMCG0235AJ...

Page 79: ...ochigi 329 2193 Japan COPYRIGHT C 2000 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 TQ0821 S Feb 2000 Printed in JAPAN NA NS VC A412U A413U VC H812U H813U ...

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