Sharp VC-A422U Service Manual Download

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Ref. No.

Part No.

★

Description

Code

Ref. No.

Part No.

★

Description

Code

VC-A422U
VC-H822U

C932

VCEA9M1HW104M V 0.1

50V Electrolytic

C933

VCEA9M1HW104M V 0.1

50V Electrolytic

C951

VCEA9M1CW106M V 10

16V Electrolytic

C956

VCEA9M1CW106M V 10

16V Electrolytic

C971

VCKYCY1HF103Z

V 0.01

50V Ceramic

C8010

VCEA9M0JW476M V 47

6.3V Electrolytic

RESISTORS

RJ102

VRS-CY1JF000J

V 0

1/16W Metal Oxide

R42

VRS-CY1JF000J

V 0

1/16W Metal Oxide

(VC-A422U/UC)

R62

VRS-CY1JF000J

V 0

1/16W Metal Oxide

R76

VRS-CY1JF000J

V 0

1/16W Metal Oxide

(VC-H822U/UC)

R77

VRS-CY1JF000J

V 0

1/16W Metal Oxide

(VC-H822U/UC)

R78

VRS-CY1JF000J

V 0

1/16W Metal Oxide

(VC-H822U/UC)

R79

VRS-CY1JF000J

V 0

1/16W Metal Oxide

(VC-H822U/UC)

R101

VRS-CY1JF470J

V 47

1/16W Metal Oxide

R103

VRS-CY1JF473J

V 47k

1/16W Metal Oxide

R104

VRD-RA2BE681J

V 680

1/8W Carbon

R105

VRD-RA2BE681J

V 680

1/8W Carbon

R107

VRS-CY1JF000J

V 0

1/16W Metal Oxide

(VC-H822U/UC)

R108

VRS-CY1JF822J

V 8.2k

1/16W Metal Oxide

(VC-A422U/UC)

R111

VRS-CY1JF153J

V 15k

1/16W Metal Oxide

R112

VRS-CY1JF153J

V 15k

1/16W Metal Oxide

R201

VRS-CY1JF682J

V 6.8k

1/16W Metal Oxide

R202

VRS-CY1JF182J

V 1.8k

1/16W Metal Oxide

R203

VRS-CY1JF822J

V 8.2k

1/16W Metal Oxide

R207

VRS-CY1JF102J

V 1k

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

R227

VRS-CY1JF750J

V 75

1/16W Metal Oxide

R228

VRS-CY1JF750J

V 75

1/16W Metal Oxide

R252

VRD-RA2EE331J

V 330

1/4W Carbon

R253

VRS-CY1JF101J

V 100

1/16W Metal Oxide

R254

VRS-CY1JF183J

V 18k

1/16W Metal Oxide

R301

VRS-CY1JF473J

V 47k

1/16W Metal Oxide

R351

VRS-CY1JF102J

V 1k

1/16W Metal Oxide

(VC-H822U/UC)

R501

VRS-CY1JF681J

V 680

1/16W Metal Oxide

R502

VRS-CY1JF273J

V 27k

1/16W Metal Oxide

R504

VRS-CY1JF000J

V 0

1/16W Metal Oxide

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-A422U/UC)

R610

VRS-CY1JF183J

V 18k

1/16W Metal Oxide

(VC-A422U/UC)

R611

VRS-CY1JF153J

V 15k

1/16W Metal Oxide

(VC-H822U/UC)

R611

VRS-CY1JF393J

V 39k

1/16W Metal Oxide

(VC-A422U/UC)

R612

VRS-CY1JF104J

V 100k

1/16W Metal Oxide

(VC-H822U/UC)

R612

VRS-CY1JF123J

V 12k

1/16W Metal Oxide

(VC-A422U/UC)

R613

VRS-CY1JF393J

V 39k

1/16W Metal Oxide

(VC-A422U/UC)

R614

VRS-CY1JF123J

V 12k

1/16W Metal Oxide

(VC-A422U/UC)

R615

VRS-CY1JF472J

V 4.7k

1/16W Metal Oxide

(VC-A422U/UC)

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-CY1JF273J

V 27k

1/16W Metal Oxide

R624

VRS-CY1JF472J

V 4.7k

1/16W Metal Oxide

R625

VRS-CY1JF222J

V 2.2k

1/16W Metal Oxide

R626

VRS-CY1JF101J

V 100

1/16W Metal Oxide

R627

VRS-CY1JF392J

V 3.9k

1/16W Metal Oxide

R653

VRS-CY1JF473J

V 47k

1/16W Metal Oxide

(VC-H822U/UC)

R654

VRS-CY1JF682J

V 6.8k

1/16W Metal Oxide

(VC-H822U/UC)

R655

VRS-CY1JF473J

V 47k

1/16W Metal Oxide

(VC-H822U/UC)

R656

VRS-CY1JF682J

V 6.8k

1/16W Metal Oxide

(VC-H822U/UC)

R657

VRS-CY1JF681J

V 680

1/16W Metal Oxide

(VC-H822U/UC)

R658

VRS-CY1JF223J

V 22k

1/16W Metal Oxide

(VC-H822U/UC)

R663

VRD-RA2BE473J

V 47k

1/8W Carbon

(VC-H822U/UC)

R664

VRS-CY1JF682J

V 6.8k

1/16W Metal Oxide

(VC-H822U/UC)

R665

VRS-CY1JF473J

V 47k

1/16W Metal Oxide

(VC-H822U/UC)

R666

VRS-CY1JF682J

V 6.8k

1/16W Metal Oxide

(VC-H822U/UC)

R667

VRD-RA2BE681J

V 680

1/8W Carbon

(VC-H822U/UC)

R668

VRS-CY1JF223J

V 22k

1/16W Metal Oxide

(VC-H822U/UC)

R671

VRS-CY1JF103J

V 10k

1/16W Metal Oxide

(VC-H822U/UC)

R672

VRS-CY1JF151J

V 150

1/16W Metal Oxide

(VC-H822U/UC)

R673

VRS-CY1JF151J

V 150

1/16W Metal Oxide

(VC-H822U/UC)

R674

VRD-RA2BE473J

V 47k

1/8W Carbon

(VC-H822U/UC)

R675

VRS-CY1JF183J

V 18k

1/16W Metal Oxide

(VC-H822U/UC)

R676

VRS-CY1JF102J

V 1k

1/16W Metal Oxide

(VC-H822U/UC)

R677

VRS-CY1JF473J

V 47k

1/16W Metal Oxide

(VC-H822U/UC)

R678

VRS-CY1JF273J

V 27k

1/16W Metal Oxide

(VC-H822U/UC)

R685

VRS-CY1JF272J

V 2.7k

1/16W Metal Oxide

(VC-H822U/UC)

R686

VRS-CY1JF272J

V 2.7k

1/16W Metal Oxide

(VC-H822U/UC)

R690

VRS-CY1JF102J

V 1k

1/16W Metal Oxide

(VC-H822U/UC)

R691

VRD-RA2BE102J

V 1k

1/8W Carbon

(VC-H822U/UC)

R702

VRS-CY1JF102J

V 1k

1/16W Metal Oxide

R703

VRS-CY1JF103J

V 10k

1/16W Metal Oxide

R704

VRS-CY1JF153J

V 15k

1/16W Metal Oxide

R705

VRS-CY1JF153J

V 15k

1/16W Metal Oxide

R707

VRS-CY1JF474J

V 470k

1/16W Metal Oxide

R708

VRS-CY1JF332J

V 3.3k

1/16W Metal Oxide

R709

VRS-CY1JF222J

V 2.2k

1/16W Metal Oxide

R710

VRS-CY1JF822J

V 8.2k

1/16W Metal Oxide

R712

VRS-CY1JF822J

V 8.2k

1/16W Metal Oxide

(VC-A422U/UC)

R713

VRD-RA2BE102J

V 1k

1/8W Carbon

R714

VRS-CY1JF223J

V 22k

1/16W Metal Oxide

R715

VRS-CY1JF472J

V 4.7k

1/16W Metal Oxide

R716

VRS-CY1JF182J

V 1.8k

1/16W Metal Oxide

R717

VRS-CY1JF123J

V 12k

1/16W Metal Oxide

R718

VRS-CY1JF563J

V 56k

1/16W Metal Oxide

R719

VRS-CY1JF183J

V 18k

1/16W Metal Oxide

Summary of Contents for VC-A422U

Page 1: ...ion and only parts identical to those specified be used VC A422U VC H822U CONTENTS 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 OPERATION FLOWCHART AND TROUBLESHOOTING GUIDE 33 7 TROUBLESHOOTING 39 8 BLOCK DIAGRAM 50 9 SCHEMATIC DIAGRAM AND PWB ...

Page 2: ...llic 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 wa...

Page 3: ...s couvercles de compartiment et ajustement ou les boucliers les réseaux de résistance condensateur d isolement Ies isolateurs mécaniques etc 3 Pour être sûr qu il n y a aucun risque de choc électrique vérifier le courant de fuite de la maniére suivante Brancher le cordon d alimentation secteur directement dans une prise de courant de 120 volts Ne pas utiliser de transformateur d isolement pour cet...

Page 4: ... 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 the s...

Page 5: ... Built in Front AV Jacks 1 2 SPECIFICATIONS Format VHS NTSC Standard Video Recording System Rotary Slant Azimuth Two Head Helical Scan System 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 model 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 ...

Page 6: ...ONENTS AND CONTROL Cassette compartment see Playback Recording POWER button When pressed to turn on the VCR the LCD backlight will light up When the power is turned off the LCD backlight will light off Basic function controls see Playback Recording ...

Page 7: ...ips 3 OPERATION Remove 1 screw 4 PWB SHIELD ANGLE Remove 1 screw 5 with shield angle MECHANISM Remove 1 screw 6 2 screws 7 MAIN PWB Remove 1 screw 8 with antenna terminal cover Remove 1 screw 9 with top cabinet fix angle MAIN FRAME SHIELD ANGLE TOP CABINET TOP CABINET FIX ANGLE OPERATION PWB LCD ASS Y MECHANISM MAIN PWB ASSEMBLY ANTENNA TERMINAL COVER ANTENNA TERMINAL COVER H A SHIELD Bottom FRONT...

Page 8: ...move the antenna terminal cover 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 1 3 4 CASSETTE HOUSING MAIN PWB VC H822U VC A422U ...

Page 9: ... 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 For other fix the vi...

Page 10: ...y 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: ... 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 25 Shifter 25 24 21 22 19 20 12 23 ...

Page 12: ...e 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 with the tensio...

Page 13: ...ion requires replacement Clean tape contact 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...

Page 14: ...ontact the guide pin or drum 5 After installing the cassette housing control once per form cassette loading operation 4 4 TO RUN A TAPE WITHOUT THE CASSETTE HOUSING CONTROL ASSEMBLY 1 Remove the full surface panel 2 Short circuit between 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 li...

Page 15: ...here 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 Figure 4 6 ...

Page 16: ...short circuiting between 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 sec...

Page 17: ...turn it 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 Set value EP6 9 2 5mN m 70 25gf cm 500g Cassette torque meter Figure 4 10 Checking 1 Make sure that value is within the setting 6 9 2 5mN m 70 25gf cm 2 The winding up torque fluctuates due to variation of rotation torque of limiter pulley ass y Read the...

Page 18: ...THE VIDEO SEARCH REWIND BACK TENSION Remove the cassette housing control assembly After short circuiting between 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 se...

Page 19: ... 4 13 CHECKING AND ADJUSTMENT OF RECORD PLAYBACK BACK TENSION Remove the cassette housing control assembly After short circuiting between 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 powe...

Page 20: ...e torque at the supply side and the 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 the ...

Page 21: ...In unloading state unplug the power cord Removal 1 Remove the screws 123 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 Height...

Page 22: ... 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 height ad...

Page 23: ...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 initial setting of A C h...

Page 24: ...ustment method 6 Playback the self picture recorded tape and check the flatness of ATR signal 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 ATR Signal Head switching pulse Figure 4 34 4 A C head X value adjustment 1 Tentatively fix A C head arm screws 1 and 2 by the method described in 4 15 Replacement 3 ...

Page 25: ...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 slow brake lever 2 3 Remove the three screws 3 Reassembly 1 Taking care so that the capstan shaft does not contact the mechanism chassis set its position on the mecha nism chassis and then install with the three screws 2 Install the slow brake lever 3 Install the...

Page 26: ...UPPER AND LOWER DRUM ASSEMBLY Replacement Perform in the numerical order 1 Remove the motor as stated in 4 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 sc...

Page 27: ...r 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 counterclockwi...

Page 28: ...r 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 Inser...

Page 29: ... Remove the loading motor and install the replacement loading motor as shown below Figure 4 46 Figure 4 44 2 When installing the master cam 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 Fully t...

Page 30: ...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: ...deo heads Check that the mechanism and all electric components are in good working condition prior to the adjustments otherwise adjustments cannot 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 TP201 204 R701 Figu...

Page 32: ...ahead of the vertical sync as shown in Figure 5 2 5 Cancel the short circuited Figure 5 2 6 0 0 5H lines CH 1 HEAD SWITCHING PULSE CH 2 VIDEO OUT CH 1 1V dev 50µsec dev CH 2 1V dev 50µsec dev V sync 1 Play a cassette which was recorded by the unit in SP mode 2 Press the PAUSE STILL button to freeze the picture 3 Look at the monitor screen and adjust or TRACK ING buttons so that the vertical jitter...

Page 33: ...urns 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 Tape load...

Page 34: ...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 is at ...

Page 35: ...ing 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 counter...

Page 36: ...m 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 system...

Page 37: ...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 Check ...

Page 38: ...nd 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: ... 2 Fuse blown out Case 1 Case 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 924 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 cir...

Page 40: ... loading motor terminal when the cassette tape is inserted Does pin 13 of IC706 change to about 10V when the cassette tape is inserted Does pin 11 of IC706 go to a H about 4 7V level when the cassette tape is inserted Does pin 86 of IC701 change from H to L level when the cassette tape is inserted Are start sensor shutter go to open when the cassette tape is inserted NO NO NO FLOW CHART NO 8 A cas...

Page 41: ...NO NO NO NO NO YES YES YES NO NO NO FLOW CHART NO 10 No power is turned on Does power control H signal at pin 95 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 emitter of Q951 Check Q951 and the AT 5V line Check peripheral circuits for poor soldering FLOW CHART NO 11 The capstan mo...

Page 42: ...otating 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 87 of IC701 Check C753 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 line between p...

Page 43: ...heral circuit of pin 50 of IC701 C715 C716 and R708 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 30 of IC701 in high impedance NO YES NO Check the line b...

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

Page 45: ...n 49 of IC701 Is the picture signal output from 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 the picture signal output from 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 5...

Page 46: ...1 Check C212 Check between pins 24 and 23 of IC201 Check C210 Is 5V applied to the CCD section power terminal pin 36 of IC201 Is the CCD control voltage approx 5V applied normally to the pin 37 from the pin 57 of IC201 Is the 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 pins 13 and 14 of IC201 peripheral circuit R201 R202 C203 SP mode ...

Page 47: ...f IC201 Is the luminance signal approx 0 5 Vp p input into pin 39 of IC201 Check between the pin 39 and pin 26 of IC201 Check C212 Check between pin 21 and pin 42 of IC201 Check C208 Check between pin 18 and pin 19 of IC201 Check C206 Check between pin 55 and pin 54 of IC201 Check C514 Check between pins 79 and 78 of IC201 Is the luminance signal approx 0 25 Vp p input and output to pins 13 14 and...

Page 48: ... output at pins 53 and 57 of IC651 RF output terminal Is there an audio signal output 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 the record FM signal output to the pins 21 to 24 ch 1 pins 21 and 22 ch 2 of Check the AH MZ connector Is the voltage of pin 29 of IC651 about 3 7V Check line of Hi Fi 5V C...

Page 49: ...height adjusted properly Replace the AC head Readjust the A C head height Is the audio signal output from 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 pin 100 of IC201 Replace IC201 Is pin 99 of IC201 in L level Check the line between pin 11 of IC201 and pin 62 of IC651 FLOW CHART NO 26 Check the periphery of pin 99 of IC201 R617 ...

Page 50: ...VC A422U VC H822U VC A422U VC H822U 50 51 8 BLOCK DIAGRAM SYSTEM SERVO BLOCK DIAGRAM USMODEL SYSBLO eps ...

Page 51: ...VC A422U VC H822U VC A422U VC H822U 52 53 SIGNAL FLOW BLOCK DIAGRAM VC A422U ...

Page 52: ...VC A422U VC H822U VC A422U VC H822U 54 55 SIGNAL FLOW BLOCK DIAGRAM VC H822U ...

Page 53: ...56 VC A422U VC H822U POWER CIRCUIT BLOCK DIAGRAM ...

Page 54: ... 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 This circuit diagram is a standard one actual circuits printed may be sub...

Page 55: ...9 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 J202 G0006AJ H822U UC F0065AJ A422U UC BLN 0090GE ...

Page 56: ...U 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 2PB709AR J201 L0006AJZZ H822U UC H0011AJZZ A422U UC 2PD601AR 2PD601AR 2PD601AR ...

Page 57: ...U VC H822U VC A422U VC H822U 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 2PB709AR H822U A422U ML ...

Page 58: ... VC H822U VC A422U VC H822U 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 2PD601AR 2PD601AR 2PD601AR ...

Page 59: ...VC A422U VC H822U VC A422U VC H822U 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 LCD CIRCUIT U0085GE 66 67 VOLTAGE MEASUREMENT MODE PB Parentheses REC Without Parentheses ...

Page 60: ...68 VC A422U VC H822U 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 61: ...69 VC A422U VC H822U 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 LCD PWB ...

Page 62: ...VC A422U VC H822U VC A422U VC H822U 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 ...

Page 63: ...72 VC A422U VC H822U M E M O ...

Page 64: ...nge qui présentent ces caractéristiques spéciales de sécurité sont identifiées dans ce manuel les pièces électriques qui présentent ces particularités sont repérée par la marque å et sont hachurées dans les listes de pièces et dans les diagrammes schématiques La substitution d une pièce de rechange par une autre qui ne présente pas les mêmes caractéristiques de sécurité que la pièce recommandée pa...

Page 65: ...8 VCKYCY1HF103Z V 0 01 50V Ceramic AA VC H822U UC C160 VCEA9M1HW225M V 2 2 50V Electrolytic AB VC H822U UC C162 VCKYCY1CB104K V 0 1 16V Ceramic AB VC H822U UC C163 VCEA9M1HW475M V 4 7 50V Electrolytic AB VC H822U UC C164 VCKYCY1CB104K V 0 1 16V Ceramic AB VC H822U UC C165 VCKYCY1CB104K V 0 1 16V Ceramic AB VC H822U UC C166 VCKYCY1EB223K V 0 022 25V Ceramic AA VC H822U UC C167 VCKYCY1CB104K V 0 1 1...

Page 66: ...CKYCY1HF103Z V 0 01 50V Ceramic AA VC H822U UC C683 VCEA9M0JW476M V 47 6 3V Electrolytic AB VC H822U UC C684 VCCCCY1HH560J V 56p 50V Ceramic AA C685 VCCCCY1HH560J V 56p 50V Ceramic AA C702 VCEA9M0JW476M V 47 6 3V Electrolytic AB C703 VCKYCY1CF104Z V 0 1 16V Ceramic AA C704 VCEA9M0JW476M V 47 6 3V Electrolytic AB C705 VCKYCY1CF104Z V 0 1 16V Ceramic AA C706 VCKYCY1CF104Z V 0 1 16V Ceramic AA C707 V...

Page 67: ...ide AA VC H822U UC R612 VRS CY1JF123J V 12k 1 16W Metal Oxide AA VC A422U UC R613 VRS CY1JF393J V 39k 1 16W Metal Oxide AA VC A422U UC R614 VRS CY1JF123J V 12k 1 16W Metal Oxide AA VC A422U UC R615 VRS CY1JF472J V 4 7k 1 16W Metal Oxide AA VC A422U UC R619 VRS CY1JF470J V 47 1 16W Metal Oxide AA R620 VRS CY1JF153J V 15k 1 16W Metal Oxide AA R621 VRD RA2EE4R7J V 4 7 1 4W Carbon AA R623 VRS CY1JF273...

Page 68: ...83J V 18k 1 16W Metal Oxide AA R832 VRD RA2BE104J V 100k 1 8W Carbon AA VC H822U UC R832 VRD RA2BE273J V 27k 1 8W Carbon AA VC A422U UC R833 VRS CY1JF183J V 18k 1 16W Metal Oxide AA R834 VRD RA2BE473J V 47k 1 8W Carbon AA R851 VRS CY1JF223J V 22k 1 16W Metal Oxide AA R852 VRS CY1JF223J V 22k 1 16W Metal Oxide AA R853 VRD RA2BE151J V 150 1 8W Carbon AA R854 VRD RA2BE151J V 150 1 8W Carbon AA å R904...

Page 69: ... Guide Lever Ass y AL 20 MLEVP0275AJZZ V Reverse Guide Drive Lever AD 21 MLEVP0292AJZZ V Slow Brake Lever AE 22 MLEVP0336AJZZ V Open Lever AD 23 MLEVP0293AJZZ V Clutch Lever AE 24 MLEVP0324AJZZ V Supply Main Brake Ass y AF 25 MLEVP0325AJZZ V Take up Main Brake Ass y AF 26 CLEVP0287AJZZ V Automatic Head Cleaner AG Ass y 27 MSLiP0010AJZZ V Shifter AH 29 MSPRD0175AJFJ V Reverse Guide Spring AE 30 MSP...

Page 70: ...ain Frame AQ 602 GCOVA2072AJKZ V Antenna Terminal Cover AE VC A422U UC 602 GCOVA2073AJKZ V Antenna Terminal Cover AE VC H822U UC 603 PSLDM4566AJFW V Shield Angle AD 604 XHPSD26P06WS0 V Screw AA 605 XHPSD30P06WS0 V Screw AA 606 LANGK0197AJFW V Top Cabinet Fix Angle AG 607 XEPSD30P14XS0 V Screw AB 608 LX HZ3047GEFF J Screw AA 609 XEBSD30P12000 V Screw AA 610 LX HZ3087GEFN J Screw AB 611 PSLDM4575AJF...

Page 71: ...ANICAL PARTS MECHANISM CHASSIS PARTS 57 55 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 30 36 9 39 45 219 10 30 40 27 43 46 43 35 2 35 1 37 34 23 48 209 210 211 212 213 223 5 26 68 69 16 202 222 221 201 220 59 70 71 56 32 22 63 62 66 66 66 66 65 62 6 202 2 202 1 ...

Page 72: ...rt No Description Code Ref No Part No Description Code 81 VC A422U VC H822U CASSETTE HOUSING CONTROL PARTS A B C D E F G H 1 2 3 4 5 6 301 303 311 311 304 306 309 305 312 316 315 307 314 310 317 313 302 308 300 ...

Page 73: ... Code Ref No Part No Description Code 82 VC A422U VC H822U CABINET PARTS A B C D E F G H 1 2 3 4 5 6 A B C C B 600 609 609 602 612 605 604 603 607 608 610 614 606 601 609 613 605 A VC A422U 609 602 611 VC H822U VC A422U VC H822U ...

Page 74: ... 5Draw out the left side rod Do not mount the front panel with the cassette cover tilted too open Otherwise the cassette cover might wrongly run on the cassette housing 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 sure that t...

Page 75: ...y Battery RF conv CH preset at 3 channel TLABV0182AJZZ Bar Code Label SPAKX1083AJZZ Packing Foam QCNW 8021AJZZ QCNW 8022AJZZ QCNW 8530AJZZ 75 ohm Coaxial Cable SPAKC4669AJZZ VC A422U UC SPAKC4576AJZZ VC H822U UC Packing Case Accessories TiNS 3944AJZZ Instruction Book VC A422U H822U TiNS 3970AJZZ Instruction Book VC H822UC RRMCG1237AJSB Infrared Remote Control Unit ...

Page 76: ...85 VC A422U VC H822U M E M O ...

Page 77: ...ta Tochigi 329 2193 Japan COPYRIGHT 2001 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 D SEM P SMM TQ1125 S May 2001 Printed in JAPAN NA DS ...

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