Sharp VC-H992U Service Manual Download Page 74

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Ref. No.

Part No.

★

Description

Code

Ref. No.

Part No.

★

Description

Code

VC-H992U
VC-H992U(A)

LBOSZ1007AJZZ

V Tension Arm boss

(VC-H992U)

LBOSZ1007GEZZ

J Tension Arm boss

(VC-H992U(A))

LBOSZ1006AJZZ

V Cassette Stay L

(VC-H992U)

LBOSZ1006GEZZ

J Cassette Stay L

(VC-H992U(A))

LCHSM0174AJZZ

V Main Chassis Ass’y

(VC-H992U)

LCHSM0174GEZZ

J Main Chassis Ass’y

(VC-H992U(A))

LHLDZ2016AJZZ

V Loading Motor Block

(VC-H992U)

LHLDZ2016GEZZ

J Loading Motor Block

(VC-H992U(A))

LPOLM0064GEZZ

J Supply Pole Base Ass’y

LPOLM0070GEZZ

J Take-Up Pole Base Ass’y

(VC-H992U)

LPOLM0069GEZZ

J Take-Up Pole Base Ass’y

(VC-H992U(A))

MLEVF0518AJZZ

V Take-Up Loading

Arm Ass’y(VC-H992U)

MLEVF0518GEZZ

J Take-Up Loading

Arm Ass’y(VC-H992U(A))

MLEVF0519AJZZ

V Supply Loading

Arm Ass’y(VC-H992U)

MLEVF0519GEZZ

J Supply Loading Arm Ass’y AF

(VC-H992U(A))

MLEVF0499AJZZ

V Pinch Drive Lever Ass’y

(VC-H992U)

MLEVF0499GEZZ

J Pinch Drive Lever Ass’y

(VC-H992U(A))

MLEVF0500GEZZ

J Pinch Roller Lever Ass’y

MLEVF0523AJZZ

V Tension Arm Ass’y

(VC-H992U)

MLEVF0523GEZZ

J Tension Arm Ass’y

(VC-H992U(A))

LANGF9620AJFW

V A/C Head Plate

(VC-H992U)

LANGF9620GEFW J A/C Head Plate

(VC-H992U(A))

MLEVP0271AJZZ

V Sifter Drive Lever

(VC-H992U)

MLEVP0271GEZZ

J Sifter Drive Lever

(VC-H992U(A))

MLEVP0272AJZZ

V Pinch Double Action Lever AD

(VC-H992U)

MLEVP0272GEZZ

J Pinch Double Action Lever AD

(VC-H992U(A))

MLEVP0301AJZZ

V Reverse Guide Lever Ass’y AL

(VC-H992U)

MLEVP0301GEZZ

J Reverse Guide Lever Ass’y AL

(VC-H992U(A))

MLEVP0275AJZZ

V Reverse Drive Lever

(VC-H992U)

MLEVP0275GEZZ

J Reverse Drive Lever

(VC-H992U(A))

MLEVP0292AJZZ

V Slow Brake Lever

(VC-H992U)

MLEVP0292GEZZ

J Slow Brake Lever

(VC-H992U(A))

MLEVP0290AJZZ

V Open Lever(VC-H992U)

MLEVP0290GEZZ

J Open Lever(VC-H992U(A)) AD

MLEVP0293AJZZ

V Clutch Lever(VC-H992U)

MLEVP0293GEZZ

J Clutch Lever(VC-H992U(A))AE

MLEVP0324AJZZ

V Sup Main Brake Ass’y

(VC-H992U)

MLEVP0324GEZZ

J Sup Main Brake Ass’y

(VC-H992U(A))

MLEVP0325AJZZ

V Take-Up Main Brake Ass’y AF

(VC-H992U)

MLEVP0325GEZZ

J Take-Up Main Brake Ass’y AF

(VC-H992U(A))

CLEVP0287AJZZ

V Automatic Head Cleaner

Ass’y

MSLiP0010AJZZ

V Sifter(VC-H992U)

MSLiP0010GEZZ

J Sifter(VC-H992U(A))

MSPRD0175AJFJ

V Reverse Guide Spring 2

(VC-H992U)

MSPRD0175GEFJ

J Reverse Guide Spring 2

(VC-H992U(A))

MSPRT0402AJFJ

V Loading Double Action

Spring(VC-H992U)

MSPRT0402GEFJ

J Loading Double Action

Spring(VC-H992U(A))

MSPRT0403AJFJ

V Pinch Double Action

Spring(VC-H992U)

MSPRT0403GEFJ

J Pinch Double Action

Spring(VC-H992U(A))

MSPRC0213AJFJ

V Earth Spring(VC-H992U)

MSPRC0213GEFJ

J Earth Spring(VC-H992U(A))AC

MSPRT0416AJFJ

V Tension Spring(VC-H992U) AD

MSPRT0416GEFJ

J Tension Spring

(VC-H992U(A))

NBLTK0067AJ00

V Reel Belt

NDAiV1078AJ00

V Reel Disk(VC-H992U)

NDAiV1078GE00

J Reel Disk(VC-H992U(A))

NGERH1293AJZZ

V Loading Connect Gear

(VC-H992U)

NGERH1293GEZZ J Loading Connect Gear

(VC-H992U(A))

NGERH1295AJ00

V Master Cam(VC-H992U)

NGERH1295GE00

J Master Cam(VC-H992U(A)) AE

NGERH1294AJZZ

V Casecon Drive Gear

(VC-H992U)

NGERH1294GEZZ J Casecon Drive Gear

(VC-H992U(A))

NGERH1270AJZZ

V Take-Up Loading Gear

(VC-H992U)

NGERH1270GEZZ J Take-Up Loading Gear

(VC-H992U(A))

NGERH1271AJZZ

V Supply Loading Gear

(VC-H992U)

NGERH1271GEZZ J Supply Loading Gear

(VC-H992U(A))

NGERH1272AJZZ

V Pinch Drive Cam

(VC-H992U)

NGERH1272GEZZ J Pinch Drive Cam

(VC-H992U(A))

NGERH1299AJZZ

V Reel Relay Gear

(VC-H992U)

NGERH1299GEZZ J Reel Relay Gear

(VC-H992U(A))

NGERW1070AJZZ V Worm Gear(VC-H992U)

NGERW1070GEZZ J Worm Gear(VC-H992U(A)) AD

NGERW1066AJZZ V Worm Wheel Gear

(VC-H992U)

NGERW1066GEZZ J Worm Wheel Gear

(VC-H992U(A))

NiDR-0018AJZZ

V Idler Wheel Ass’y

(VC-H992U)

NiDR-0018GEZZ

J Idler Wheel Ass’y

(VC-H992U(A))

NPLYV0162AJZZ

V Motor Pulley(VC-H992U)

NPLYV0162GEZZ

J Motor Pulley(VC-H992U(A))AD

NPLYV0163AJZZ

V Limiter Pulley Ass’y

(VC-H992U)

NPLYV0163GEZZ

J Limiter Pulley Ass’y

(VC-H992U(A))

NROLP0131GEZZ

J Guide Roller

NSFTP0032AJZZ

V Tension Pole Adjuster

(VC-H992U)

NSFTP0032GEZZ

J Tension Pole Adjuster

(VC-H992U(A))

MSPRC0217AJFJ

V Guide Roller Spring

(VC-H992U)

MSPRC0217GEFJ

J Guide Roller Spring

(VC-H992U(A))

Summary of Contents for VC-H992U

Page 1: ...RICAL ADJUSTMENT 30 5 1 ADJUSTMENT OF HEAD SWITCHING POINT 31 Page 5 2 ADJUSTMENT OF FV False Vertical Sync OF STILL PICTURE 31 5 3 CHECKING OF OFF TRACK 31 5 4 ADJUSTMENT OF SIF INPUT LEVEL 32 5 5 ADJUSTMENT OF STEREO SEPARATION 32 6 MECHANISM OPERATION FLOWCHART AND TROUBLESHOOTING GUIDE 33 7 TROUBLESHOOTING 39 8 BLOCK DIAGRAM 50 9 SCHEMATIC DIAGRAM AND PWB FOIL PATTERN 56 10 PARTS LIST 69 11 EX...

Page 2: ...ntrol 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 resi...

Page 3: ...t 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 ...

Page 4: ...1k ohm Frequency response 80Hz 10kHz SP mode linear 20Hz 20kHz Hi Fi mode Signal to noise ratio 43dB SP mode linear Hi Fi dynamic range 90dB Wow and flutter 0 005 max Hi Fi mode with T 120 tape 4 Receiving channel VHF Channels 2 13 UHF Channels 14 69 CATV Channels A 8 A 5 W 84 Antenna Input Impedance 75 ohm 5 Misc Fast forward Rewind time Approximate 54 second with T 120 cassette Power source 120 ...

Page 5: ...5 VC H992U VC H992U A 1 3 LOCATION OF MAJOR COMPONENTS AND CONTROL ...

Page 6: ... and 7 clips 4 OPERATION Remove 1 screw 5 PWB SHIELD ANGLE Remove 2 screws 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 OPERATION PWB FRONT PANEL SHIELD ANGLE TOP CABINET ANTENNA TERMINAL COVER MECHANISM MAIN PWB ASSEMBLY TOP CABINET FIX ANGLE H A SHIELD TO...

Page 7: ...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 8: ...sition 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 For other fi...

Page 9: ...se head 2 Sup pole base ass y 3 Tension arm 4 Idler ass y 5 Pinch drive lever ass y 6 Supply reel disk 7 Sup main brake 8 Tu main brake 9 Pinch drive cam 10 A C head ass y 11 Reverse guide 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 10: ... PARTS BOTTOM VIEW No Function No Function 15 Drum ass y 16 Loading motor 17 Drum drive motor 18 Tu pole base ass y 19 Slow brake 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 11: ...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 tension ...

Page 12: ...N ratio no colour Poorflatnessoftheenvelope with alignment tape Cassette not loaded or un loaded No tape running tape slack Clean tape contact part with the specified cleaning liquid Abnormal rotation or significant vi bration requires replacement Clean rubber and rubber contact area with the speci fied cleaning liquid Cleantapecontactareawith the specified cleaning liquid Notaperunning unevencol ...

Page 13: ...and tool do not contact the guide pin or drum 5 After installing the cassette housing control once per form cassette loading operation TO RUN A TAPE WITHOUT THE CASSETTE HOUSING CONTROL ASSEMBLY 1 Remove the full surface panel 2 Short circuit TP801 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 wit...

Page 14: ...brake surface 2 After reassembly check the video search rewind back tension see page 17 and check the brake torque see page 19 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 Not...

Page 15: ...circuiting TP801 provided at the center facing to the main 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...

Page 16: ...urn 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 Figure 4 11 Torque gauge Supply reel disk 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 replac...

Page 17: ...VIDEO SEARCH REWIND BACK TENSION Remove the cassette housing control assembly After short circuiting TP801 provided at the center facing to the main 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 seco...

Page 18: ...ght CHECKING AND ADJUSTMENT OF RECORD PLAYBACK BACK TENSION Remove the cassette housing control assembly After short circuiting TP801 provided at the center facing to the main 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 19: ...ofthebraketorqueatthesupplysideandthe 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 CHECKING THE BRAKE TORQUE Checking the brake torque at the sup...

Page 20: ...ding 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 spring 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 21: ...er 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 jus...

Page 22: ...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 23: ...layback switching point 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 Page 22 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 ...

Page 24: ... adjust the playback switching point for adjustment of servo circuit REPLACEMENT OF THE CAPSTAN D D DIRECT DRIVE MOTOR Remove the mechanism from the main PWB refer to Page 7 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 does not contact...

Page 25: ...D LOWER DRUM ASSEMBLY Replacement Perform in the numerical order 1 Remove the motor as stated in Page 24 D D motor replacement 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 screws 4...

Page 26: ...er 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 counterclockw...

Page 27: ...the phase matching at the insert point 1 see the 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 Insert point 2 Rotatio...

Page 28: ... 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 15 gf Adjust the distance between motor and pulley to 10 2 mm E ring XRESJ30 06000 Master cam Fully turn clockwise Fully turn cou...

Page 29: ...nd Drive Gear R 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 30: ...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 VROEFZCS Screwdriver for adjustment Color bar generator RF signal generator P201 TP201 204 R724 R142 R14...

Page 31: ...tween TP802 on the main PWB and pressbothCHbutton andCHbutton at same time 3 Press the tracking buttons and 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 Cancel the short circuit Note Self recorded tape is a cassette whose program was re corded by the unit bei...

Page 32: ... channel only and adjust R142 S IF ADJ so that the right channel output becomes minimized 5 5 ADJUSTMENTOFSTEREOSEPARATION Measuring AC milli voltmeter and RF signal instrument generator Mode E E Input signal RF CH 10 at 3kHz 30 MOD Test point AUDIO OUT jack R channel Control R144 SEPARATION ADJ Specification Minimized 1 Feed the RF signal CH 10 at 3kHz 30 MOD to antenna terminal 2 Connect the AC ...

Page 33: ...ction 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 loading Pinch roller com...

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: ...ding 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 counte...

Page 36: ...em 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 syste...

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 coutrol running Unusual sound heard with pinch roller lever going up or down Is unusual sound heard during loading unloading Check...

Page 38: ...und 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: ...heck 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 and che...

Page 40: ...er 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 sensor a...

Page 41: ... 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 periperal circuits for poor soldering FLOW CHART NO 12 The capstan motor f...

Page 42: ... 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 R724 HEAD SW POINT control Could be lines between IC706 and IC701 Check periperal 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 be...

Page 43: ...ipheral 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 line bet...

Page 44: ...701 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 the A ...

Page 45: ...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 applied ...

Page 46: ...01 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 C203...

Page 47: ...s 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 pins ...

Page 48: ...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 TP1401 1402 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 l...

Page 49: ...justed 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 H992U VC H992U A 50 8 BLOCK DIAGRAM SYSTEM SERVO BLOCK DIAGRAM ...

Page 51: ...VC H992U VC H992U A 51 ...

Page 52: ...VC H992U VC H992U A 52 SIGNAL FLOW BLOCK DIAGRAM ...

Page 53: ...VC H992U VC H992U A 53 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 54: ...VC H992U VC H992U A 54 POWER CIRCUIT BLOCK DIAGRAM ...

Page 55: ...i cated as follows 4 0 Record mode SP 4 0 PB mode SP 4 0 LP mode 4 0 EP mode NOTE 1 The unit of resistance ohm is omitted 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 vo...

Page 56: ...VC H992U VC H992U A 56 VOLTAGE MEASUREMENT MODE PB Parentheses REC Without Parentheses A B C D E F G H 1 2 3 4 5 6 7 9 SCHEMATIC DIAGRAM AND PWB FOIL PATTERN MAIN CIRCUIT 1 ...

Page 57: ...VC H992U VC H992U A 57 7 8 9 10 11 12 13 ...

Page 58: ...VC H992U VC H992U A 58 VOLTAGE MEASUREMENT MODE PB Parentheses REC Without Parentheses A B C D E F G H 1 2 3 4 5 6 7 MAIN CIRCUIT 2 ...

Page 59: ...VC H992U VC H992U A 59 7 8 9 10 11 12 13 ...

Page 60: ...VC H992U VC H992U A 60 VOLTAGE MEASUREMENT MODE PB Parentheses REC Without Parentheses A B C D E F G H 1 2 3 4 5 6 7 MAIN CIRCUIT 3 ...

Page 61: ...VC H992U VC H992U A 61 7 8 9 10 11 12 13 ...

Page 62: ...VC H992U VC H992U A 62 VOLTAGE MEASUREMENT MODE PB Parentheses REC Without Parentheses A B C D E F G H 1 2 3 4 5 6 7 MAIN CIRCUIT 4 ...

Page 63: ...VC H992U VC H992U A 63 7 8 9 10 11 12 13 ...

Page 64: ...VC H992U VC H992U A 64 VOLTAGE MEASUREMENT MODE PB Parentheses REC Without Parentheses A B C D E F G H 1 2 3 4 5 6 7 OPERATION CIRCUIT ...

Page 65: ...VC H992U VC H992U A 65 PWB FOIL PATTERN OPERATION PWB A B C D E F G H 1 2 3 4 5 6 7 ...

Page 66: ...VC H992U VC H992U A 66 A B C D E F G H 1 2 3 4 5 6 7 MAIN PWB ...

Page 67: ...VC H992U VC H992U A 67 7 8 9 10 11 12 13 ...

Page 68: ...Ref No Part No Description Code Ref No Part No Description Code 68 VC H992U VC H992U A M E M O ...

Page 69: ...0H 1 V PST600H AE IC706 VHiLB1988 1 V LB1988 AQ IC801 VHiMN12511 1 V MN12511 AQ IC903 VHiKiA431 1 V KIA431 AE TRANSISTORS Q251 VS2SA1037KQ 1 V 2SA1037KQ AA Q302 VS2SD1306 E1E V 2SD1306 AD Q306 VS2SA1037KQ 1 V 2SA1037KQ AA Q501 VS2SC2412KQ 1 V 2SC2412KQ AA Q602 VS2C3939SQR 1 V 2C3939SQR AC Q603 VS2SC2412KQ 1 V 2SC2412KQ AA Q651 VS2SD1306 E1E V 2SD1306 AD Q652 VS2SD1306 E1E V 2SD1306 AD Q653 VSUN211...

Page 70: ... 0 01 25V Ceramic AA C620 VCEA9M1CW106M V 10 16V Electrolytic AB C621 VCQPYA2AA562J V 5600p 100V AC C622 VCKYCY1HB222K V 2200p 50V Ceramic AA C628 VCKYCY1HB222K V 2200p 50V Ceramic AA C630 VCKYCY0JF105Z V 1 6 3V Ceramic AB C651 VCEA9M1HW475M V 4 7 50V Electrolytic AB C652 VCEA9M0JW336M V 33 6 3V Electrolytic AE C653 VCEA9M1CW106M V 10 16V Electrolytic AB C654 VCEA9M1CW106M V 10 16V Electrolytic AB...

Page 71: ...145 VRS CY1JF000J V 0 1 16W Metal Oxide AA R201 VRS CY1JF682J V 6 8k 1 16W Metal Oxide AA R202 VRS CY1JF182J V 1 8k 1 16W Metal Oxide AA R203 VRS CY1JF682J V 6 8k 1 16W Metal Oxide AA C657 VCKYCY1EB153K V 0 015 25V Ceramic AA C658 VRS CY1JF000J V 0 1 16W Metal Oxide AA C659 VRS CY1JF000J V 0 1 16W Metal Oxide AA C661 VCEA9M1HW475M V 4 7 50V Electrolytic AB C662 VCEA9M0JW336M V 33 6 3V Electrolytic...

Page 72: ...8 VRS CY1JF102J V 1k 1 16W Metal Oxide AA R799 VRS CY1JF102J V 1k 1 16W Metal Oxide AA R207 VRS CY1JF101J V 100 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 AA R229 VRS CY1JF101J V 100 1 16W Metal Oxide AA R232 VRS CY1JF153J V 15k 1 16W Metal Oxi...

Page 73: ... Oxide AA R823 VRS CY1JF332J V 3 3k 1 16W Metal Oxide AA R824 VRS CY1JF472J V 4 7k 1 16W Metal Oxide AA R825 VRS CY1JF822J V 8 2k 1 16W Metal Oxide AA R826 VRS CY1JF333J V 33k 1 16W Metal Oxide AA R832 VRS CY1JF103J V 10k 1 16W Metal Oxide AA R833 VRS CY1JF103J V 10k 1 16W Metal Oxide AA R841 VRD RA2BE822J V 8 2k 1 8W Carbon AA R843 VRD RA2BE474J V 470k 1 8W Carbon AA R845 VRD RA2BE474J V 470k 1 8...

Page 74: ...ss y AF VC H992U 25 MLEVP0325GEZZ J Take Up Main Brake Ass y AF VC H992U A 26 CLEVP0287AJZZ V Automatic Head Cleaner AG Ass y 27 MSLiP0010AJZZ V Sifter VC H992U AH 27 MSLiP0010GEZZ J Sifter VC H992U A AH 29 MSPRD0175AJFJ V Reverse Guide Spring 2 AE VC H992U 29 MSPRD0175GEFJ J Reverse Guide Spring 2 AE VC H992U A 30 MSPRT0402AJFJ V Loading Double Action AE Spring VC H992U 30 MSPRT0402GEFJ J Loading...

Page 75: ...ssette Housing Control AX Ass y VC H992U 300 CHLDX3081GE02 J Cassette Housing Control AX Ass y VC H992U A 301 LANGF9592AJFW V Upper Plate VC H992U AL 301 LANGF9592GEFW J Upper Plate VC H992U A AL 302 LHLDX1028AJ00 V Frame L VC H992U AH 302 LHLDX1028GE00 J Frame L VC H992U A AH 303 LHLDX1030AJZZ V Frame R VC H992U AE 303 LHLDX1030GEZZ J Frame R VC H992U A AE 304 LHLDX1031AJZZ V Holder L VC H992U AE...

Page 76: ... Spring AB VC H992U 500 7 MSPRD0103EJFJ K Cassette Spring AB VC H992U A 502 JBTN 2942AJSA V Button PLAY AH VC H992U 502 JBTN 2942EJSA K Button PLAY AH VC H992U A 503 LHLDZ2066AJZZ V Button Holder VC H992U AG 503 LHLDZ2066EJZZ K Button Holder AG VC H992U A 505 TLABZ1574AJZZ V Feature Label VC H992U AH 505 TLABZ1590EJZZ K Feature Label AH VC H992U A SUPPLIED ACCESSORIES ACCESSORIES SSAKA0001AJZZ V P...

Page 77: ... 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 16 202 222 221 201 202 202 220 59 70 57 71 56 32 22 63 62 66 66 66 66 65 62 ...

Page 78: ...t No Description Code Ref No Part No Description Code 78 VC H992U VC H992U A 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 79: ...Part No Description Code Ref No Part No Description Code 79 VC H992U VC H992U A CABINET PARTS A B C D E F G H 1 2 3 4 5 6 A 611 B C C B 600 609 615 602 612 605 604 603 607 608 610 614 606 601 615 609 613 A 605 ...

Page 80: ...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 81: ...322AJZZ 75 ohm Coaxial Cable RRMCG0235AJSB Infrared Remote Control Unit Dry Battery RF conv CH preset at 3 channel Accessories TiNS 3499AJZZ Operation Manual VC H992U TiNS 3499EJZZ Operation Manual VC H992U A TGAN 0001AJZZ Guarantee Card VC H992U TGAN 0001EJZZ Guarantee Card VC H992U A TCADH3051AJZZ Timer Card VC H992U TCADH3051EJZZ Timer Card VC H992U A SPAKC3951AJZZ VC H992U SPAKC3998EJZZ VC H99...

Page 82: ...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 TQ0583 S Jan 1999 Printed in JAPAN NA NS VC H992U VC H992U A ...

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