Sharp XA-905 Service Manual Download Page 68

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Ref. No.

Part No.

★

Description

Code

Ref. No.

Part No.

★

Description

Code

XA-905
XA-920

R610

VRS-CY1JF183J

V 18k

1/16W Metal Oxide

(XA-905)

R611

VRS-CY1JF153J

V 15k

1/16W Metal Oxide

(XA-920)

R611

VRS-CY1JF393J

V 39k

1/16W Metal Oxide

(XA-905)

R612

VRS-CY1JF123J

V 12k

1/16W Metal Oxide

(XA-905)

R612

VRS-CY1JF823J

V 82k

1/16W Metal Oxide

(XA-920)

R613

VRS-CY1JF393J

V 39k

1/16W Metal Oxide

(XA-905)

R614

VRS-CY1JF123J

V 12k

1/16W Metal Oxide

(XA-905)

R615

VRS-CY1JF472J

V 4.7k 1/16W Metal Oxide

(XA-905)

R616

VRS-CY1JF103J

V 10k

1/16W Metal Oxide

(XA-905)

R617

VRS-CY1JF103J

V 10k

1/16W Metal Oxide

(XA-920)

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

(XA-905)

R653

VRS-CY1JF473J

V 47k

1/16W Metal Oxide

(XA-920)

R654

VRS-CY1JF682J

V 6.8k 1/16W Metal Oxide

(XA-920)

R655

VRS-CY1JF473J

V 47k

1/16W Metal Oxide

(XA-920)

R656

VRS-CY1JF682J

V 6.8k 1/16W Metal Oxide

(XA-920)

R657

VRS-CY1JF101J

V 100

1/16W Metal Oxide

(XA-920)

R658

VRS-CY1JF223J

V 22k

1/16W Metal Oxide

(XA-920)

R659

VRD-RA2BE681J

V 680

1/8W

Carbon

(XA-920)

R663

VRS-CY1JF473J

V 47k

1/16W Metal Oxide

(XA-920)

R664

VRS-CY1JF682J

V 6.8k 1/16W Metal Oxide

(XA-920)

R665

VRS-CY1JF473J

V 47k

1/16W Metal Oxide

(XA-920)

R666

VRS-CY1JF682J

V 6.8k 1/16W Metal Oxide

(XA-920)

R667

VRD-RA2BE101J

V 100

1/8W

Carbon

(XA-920)

R668

VRS-CY1JF223J

V 22k

1/16W Metal Oxide

(XA-920)

R669

VRD-RA2BE681J

V 680

1/8W

Carbon

(XA-920)

R670

VRS-CY1JF273J

V 27k

1/16W Metal Oxide

(XA-920)

R671

VRS-CY1JF103J

V 10k

1/16W Metal Oxide

(XA-920)

R672

VRS-CY1JF151J

V 150

1/16W Metal Oxide

(XA-920)

R673

VRS-CY1JF151J

V 150

1/16W Metal Oxide

(XA-920)

R674

VRS-CY1JF473J

V 47k

1/16W Metal Oxide

(XA-920)

R675

VRS-CY1JF183J

V 18k

1/16W Metal Oxide

(XA-920)

R676

VRS-CY1JF102J

V 1k

1/16W Metal Oxide

(XA-920)

R677

VRS-CY1JF473J

V 47k

1/16W Metal Oxide

(XA-920)

R685

VRS-CY1JF102J

V 1k

1/16W Metal Oxide

(XA-920)

R686

VRS-CY1JF102J

V 1k

1/16W Metal Oxide

(XA-920)

R690

VRS-CY1JF000J

V 0

1/16W Metal Oxide

(XA-920)

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

(XA-920)

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

R713

VRS-CY1JF564J

V 560k 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

(XA-905)

R722

VRS-CY1JF102J

V 1k

1/16W Metal Oxide

R723

VRS-CY1JF000J

V 0

1/16W Metal Oxide

R726

VRS-CY1JF103J

V 10k

1/16W Metal Oxide

R727

VRD-RA2EE151J

V 150

1/4W

Carbon

R728

VRS-CY1JF182J

V 1.8k 1/16W Metal Oxide

R729

VRD-RA2BE154J

V 150k 1/8W

Carbon

R731

VRS-CY1JF103J

V 10k

1/16W Metal Oxide

R732

VRS-CY1JF223J

V 22k

1/16W Metal Oxide

R734

VRD-RA2BE223J

V 22k

1/8W

Carbon

R735

VRS-CY1JF563J

V 56k

1/16W Metal Oxide

R736

VRS-CY1JF123J

V 12k

1/16W Metal Oxide

R737

VRS-CY1JF000J

V 0

1/16W Metal Oxide

R738

VRD-RA2BE104J

V 100k 1/8W

Carbon

R739

VRD-RA2BE271J

V 270

1/8W

Carbon

R740

VRD-RA2BE104J

V 100k 1/8W

Carbon

R741

VRD-RA2BE271J

V 270

1/8W

Carbon

R742

VRS-CY1JF473J

V 47k

1/16W Metal Oxide

R743

VRD-RA2BE391J

V 390

1/8W

Carbon

R744

VRS-CY1JF473J

V 47k

1/16W Metal Oxide

R745

VRD-RA2BE391J

V 390

1/8W

Carbon

R746

VRS-CY1JF103J

V 10k

1/16W Metal Oxide

R748

VRS-CY1JF1R0J

V 1

1/16W Metal Oxide

R749

VRD-RM2HD271J

V 270

1/2W

Carbon

R751

VRD-RA2BE123J

V 12k

1/8W

Carbon

R752

VRD-RA2BE123J

V 12k

1/8W

Carbon

R754

VRS-CY1JF102J

V 1k

1/16W Metal Oxide

R756

VRS-CY1JF102J

V 1k

1/16W Metal Oxide

R758

VRD-RA2BE103J

V 10k

1/8W

Carbon

R760

VRS-CY1JF104J

V 100k 1/16W Metal Oxide

R761

VRS-CY1JF104J

V 100k 1/16W Metal Oxide

R762

VRS-CY1JF123J

V 12k

1/16W Metal Oxide

R763

VRS-CY1JF563J

V 56k

1/16W Metal Oxide

R764

VRS-CY1JF183J

V 18k

1/16W Metal Oxide

R765

VRS-CY1JF223J

V 22k

1/16W Metal Oxide

R768

VRS-CY1JF102J

V 1k

1/16W Metal Oxide

R769

VRS-CY1JF472J

V 4.7k 1/16W Metal Oxide

R770

VRS-CY1JF332J

V 3.3k 1/16W Metal Oxide

R772

VRS-CY1JF822J

V 8.2k 1/16W Metal Oxide

(XA-905)

R773

VRS-CY1JF222J

V 2.2k 1/16W Metal Oxide

R774

VRS-CY1JF102J

V 1k

1/16W Metal Oxide

(XA-920)

R776

VRS-CY1JF681J

V 680

1/16W Metal Oxide

R777

VRS-CY1JF681J

V 680

1/16W Metal Oxide

R778

VRS-CY1JF104J

V 100k 1/16W Metal Oxide

R779

VRD-RA2BE103J

V 10k

1/8W

Carbon

R780

VRD-RA2BE103J

V 10k

1/8W

Carbon

R781

VRD-RA2BE103J

V 10k

1/8W

Carbon

R782

VRS-CY1JF154J

V 150k 1/16W Metal Oxide

R783

VRS-CY1JF392J

V 3.9k 1/16W Metal Oxide

R784

VRS-CY1JF104J

V 100k 1/16W Metal Oxide

R785

VRS-CY1JF105J

V 1M

1/16W Metal Oxide

R786

VRS-CY1JF564J

V 560k 1/16W Metal Oxide

Summary of Contents for XA-905

Page 1: ...ODELS Page 1 GENERAL INFORMATION 4 2 DISASSEMBLY AND REASSEMBLY 6 3 FUNCTION OF MAJOR MECHANICAL PARTS 9 4 ADJUSTMENT REPLACEMENT AND ASSEMBLY OF MECHANICAL UNITS 11 5 ELECTRICAL ADJUSTMENT 30 6 MECHANISM OPERATION FLOWCHART AND TROUBLESHOOTING GUIDE 32 7 TROUBLESHOOTING 38 8 BLOCK DIAGRAM 50 9 SCHEMATIC DIAGRAM AND PWB FOIL PATTERN 58 10 PARTS LIST 73 11 EXPLODED VIEW OF MECHANICAL PARTS 81 12 PA...

Page 2: ...ol 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 resisto...

Page 3: ...ith 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 sym...

Page 4: ...Repeat Full Automatic Playback Tamper Proof Up to 8 Hours of Recording and Playback with T 160 cassette 1 2 SPECIFICATIONS Format VHS NTSC Standard Video Recording System Rotary Two Head Helical Scanning 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 in...

Page 5: ...utton ON SCREEN button SET button VCR Plus button ZERO BACK button SKIP SEARCH button REPLAY button PAUSE STILL button TAMPER PROOF button STOP button button XA 920 FF button POWER button EJECT button TV VCR button REW button REC button TAPE SPEED button Numbered buttons PLAY button 100 ENT AM PM button AUTO REPEAT button CANCEL button INPUT button SLOW button Inserting the Batteries Make sure tha...

Page 6: ...erminal cover Remove 1 screw w with top cabinet fix angle PAUSE JACK Remove 3 screws e 1 screw r 2 PWB clips t with Pause Jack PWB and Pause Jack cover Disconnect earth lead and wire lead VIDEO JACK Remove 2 screws y and disconnect PWB wire lead B C A B 5 9 6 10 11 7 8 3 3 C 1 12 2 4 XA 920 XA 905 XA 920 XA 905 Except XA 905 11 A 2 4 VIDEO JACK PWB PAUSE JACK PWB 13 14 15 16 TOP CABINET SHIELD ANG...

Page 7: ...ove 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: ...t 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 For othe...

Page 9: ...ole 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 10: ...OTTOM 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 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: ...rt 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 EXECUTION TIM...

Page 13: ...ct 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 CAS SETTE 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 two ...

Page 14: ...re 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 No...

Page 15: ... 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 hand ...

Page 16: ...00g Cassette torque meter Figure 4 10 Press the picture record button and set EP picture record mode x3 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 center value of fluctuation as setting 3 Set the EP record mode x3 and make sure that the winding up torque is with...

Page 17: ...G 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 seconds ...

Page 18: ...ht 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 power swit...

Page 19: ...braketorqueatthesupplysideandthe 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 sup...

Page 20: ... 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 s...

Page 21: ...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 22: ...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 initial settin...

Page 23: ... 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 by the ...

Page 24: ... head 4 Protect the hole elements from shock due to contact with D D stator or D D rotor ass y 5 After installation adjust the playback switching point for adjustment of servo circuit 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 25: ...R AND LOWER DRUM ASSEMBLY Replacement Perform in the numerical order 1 Remove the motor as stated in4 20D 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 screws 4...

Page 26: ...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 counterclockwise...

Page 27: ...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 Insert ...

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 1 500 gf Adjust the distance between motor and pulley to 10 2 mm E ring XRESJ30 06000 Master cam Fully turn clockwise Fully turn ...

Page 29: ...ive 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 30: ... 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 Figure...

Page 31: ...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 corded by the unit being adjusted 5 2 ADJUSTMENT OF FV False Vertical Sync OF STILL PICTURE 5 3 CHECKING OF OFF TRACK Measuring Dual trace oscilloscope instrument Mode Playback Cassette Alignment tape VROEFZHS Test point VIDEO OUT jack...

Page 32: ...ns 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 loadin...

Page 33: ...d 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 PU...

Page 34: ...g 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 countercl...

Page 35: ...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 i...

Page 36: ...sk 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 pi...

Page 37: ... 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 38: ...eck 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 chec...

Page 39: ... go to open when the cassette tape is inserted FLOW CHART NO 7 No operation is possible from the infrared remote control Operation is possible from the VCR but no operation is possible from the infrared remote control Is the supply voltage of 5V feed to pin 3 terminal of remote control receiver Check AT 5V lines Is L pulse sent out pin 1 terminal of receiver when the infrared remote control is act...

Page 40: ...ES YES NO 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 ...

Page 41: ...or 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 line betwe...

Page 42: ...eral 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 betwee...

Page 43: ...01 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 C...

Page 44: ...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 to ...

Page 45: ...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 SP...

Page 46: ...uminance 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 13 ...

Page 47: ... 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 line Rep...

Page 48: ...ted 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 49: ...49 XA 905 XA 920 M E M O ...

Page 50: ...XA 905 XA 920 XA 905 XA 920 50 51 8 BLOCK DIAGRAM SYSTEM SERVO BLOCK DIAGRAM ...

Page 51: ...5 XA 920 52 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 SIGNAL FLOW BLOCK DIAGRAM XA 905 ...

Page 52: ...5 XA 920 54 55 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 SIGNAL FLOW BLOCK DIAGRAM XA 920 ...

Page 53: ...56 XA 905 XA 920 POWER CIRCUIT BLOCK DIAGRAM XA 920 ...

Page 54: ...ated 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 volta...

Page 55: ...20 XA 905 XA 920 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: ...XA 905 XA 920 XA 905 XA 920 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: ...XA 905 XA 920 XA 905 XA 920 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: ...XA 905 XA 920 XA 905 XA 920 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 XA 905 XA 920 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 PAUSE JACK CIRCUIT VIDEO JACK CIRCUIT ...

Page 60: ...67 XA 905 XA 920 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 VIDEO JACK PWB Component Side Wiring Side PAUSE JACK PWB Wiring Side Component Side ...

Page 61: ...XA 905 XA 920 XA 905 XA 920 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: ...XA 905 XA 920 XA 905 XA 920 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 XA 905 XA 920 M E M O ...

Page 64: ...845TEVZ XA 920 MAIN UNIT TUNER TU101 VTUATMDH2 A03 V Tuner BE INTEGRATED CIRCUITS IC201 VHiHA8317NF 1 V HA8317NF Y C Audio AZ Processor IC601 VHiBA7755A 1 V BA7755A Rec PB Head AE SW IC651 VHiAN3662FB 1 V AN3662FB HiFi Audio AZ Processor XA 920 IC701 RH iX1567GEN2Q J IX1567GE AZ IC702 VHiPST600H 1 V PST600H AE IC706 VHiLB1988 1 V LB1988 Loading Drum AQ M Driver IC710 VHiKS24C02S1E V KS24C02S E2 PR...

Page 65: ...L901 RCiLF0005AJZZ V Coil CiLF0005AJ AE å L921 RCiLP0147GEZZ J Coil CiLP0147GE AC or å L921 RCiLP0161CEZZ V Coil CiLP0161CE AD å L922 RCiLP0147GEZZ J Coil CiLP0147GE AC or å L922 RCiLP0161CEZZ V Coil CiLP0161CE AD TRANSFORMERS T601 RTRNH0098GEZZ J OSC Transformer AE or T601 RTRNH0086GEZZ J OSC Transformer AD å T901 RTRNZ0048AJZZ V Transformer AQ or å T901 RTRNZ0047AJZZ V Transformer AV or å T901 R...

Page 66: ...0 1 16V Ceramic AA XA 905 C611 VCKYCY1CF104Z V 0 1 16V Ceramic AA C613 VCKYCY1EB183K V 0 018 25V Ceramic AA XA 905 C614 VCKYCY1HB222K V 2200p 50V Ceramic AA C617 VCEA9M1CW476M V 47 16V Electrolytic AB C618 VCKYCY1EB103K V 0 01 25V Ceramic AA C619 VCKYCY1EB103K V 0 01 25V Ceramic AA C620 VCEA9M1CW106M V 10 16V Electrolytic AB C621 VCQPYA2AA562J V 5600p 100V AC C622 VCKYCY1HB222K V 2200p 50V Ceramic...

Page 67: ...c AB C951 VCKYCY1HF333Z V 0 033 50V Ceramic AA C953 VCEA9M1CW106M V 10 16V Electrolytic AB C954 VCEA9M1HW105M V 1 50V Electrolytic AB C971 VCEA9M0JW226M V 22 6 3V Electrolytic AB C981 VCEA9M0JW476M V 47 6 3V Electrolytic AB C985 VCEA9M0JW476M V 47 6 3V Electrolytic AB C991 VCEA9M1CW476M V 47 16V Electrolytic AB RESISTORS JA566 QJUM 1001GEFW V Jumper RJ102 VRS CY1JF000J V 0 1 16W Metal Oxide AA XA ...

Page 68: ... 1k 1 16W Metal Oxide AA XA 920 R710 VRS CY1JF473J V 47k 1 16W Metal Oxide AA R711 VRS CY1JF473J V 47k 1 16W Metal Oxide AA R712 VRS CY1JF223J V 22k 1 16W Metal Oxide AA R713 VRS CY1JF564J V 560k 1 16W Metal Oxide AA R714 VRS CY1JF332J V 3 3k 1 16W Metal Oxide AA R715 VRS CY1JF102J V 1k 1 16W Metal Oxide AA R716 VRS CY1JF102J V 1k 1 16W Metal Oxide AA R717 VRS CY1JF681J V 680 1 16W Metal Oxide AA ...

Page 69: ... V 2 2k 1 8W Carbon AA R975 VRD RA2BE473J V 47k 1 8W Carbon AA R981 VRS CY1JF103J V 10k 1 16W Metal Oxide AA R982 VRS CY1JF561J V 560 1 16W Metal Oxide AA R983 VRS CY1JF000J V 0 1 16W Metal Oxide AA R991 VRS CY1JF102J V 1k 1 16W Metal Oxide AA R992 VRS CY1JF222J V 2 2k 1 16W Metal Oxide AA R993 VRS CY1JF103J V 10k 1 16W Metal Oxide AA BALUNES FB701 RBLN 0036CEZZ V Balun BLN 0036CEZZ AB FB702 RBLN ...

Page 70: ... 6 4 7 0 5 RED AB 220 LX BZ3096GEFD J Tilt Adjusting Screw AA 221 XBPSD26P06000 V Azimuth Adjusting Screw AA 2 6 6S 222 LX BZ3197GEFD J Screw A C Head AD 223 XWHJZ31 08052 V Washer W3 1 5 2 0 8 AC CASSETTE HOUSING CONTROL PARTS 300 CHLDX3081TEV2 V Cassette Housing Control AX Ass y 301 LANGF9592AJFW V Upper Plate AL S885 QSW K0086GEZZ J Switch FF AC or S885 QSW K0004AJZZ V Switch FF AB S886 QSW K00...

Page 71: ...HZ3087GEFN J Screw AB 612 LHLDZ1962AJ00 V Sensor LED Cover AD 613 PGUMS0026AJZZ V Foot Cushion AB 614 TLABM4308AJZZ V Model Label XA 920 AC 614 TLABM4309AJZZ V Model Label XA 905 AC 615 XJPSD30P10WS0 V Screw AA 616 GCOVA2097AJKZ V Pause Jack Cover AH FRONT PANEL PARTS 500 CPNLC2813TEV1 V Front Panel Ass y AT XA 920 500 CPNLC2814TEV1 V Front Panel Ass y AS XA 905 500 1 Front Panel Not Replacement I...

Page 72: ...CHANICAL 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 73: ...Part No Description Code Ref No Part No Description Code 82 XA 905 XA 920 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 74: ...Code Ref No Part No Description Code 83 XA 905 XA 920 CABINET PARTS A B C D E F G H 1 2 3 4 5 6 B C C B 600 609 615 602 602 1 612 605 604 603 607 608 610 614 606 601 615 609 613 605 A A XA 920 XA 905 XA 920 XA 905 609 616 609 609 ...

Page 75: ... 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 sureth...

Page 76: ... 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 sureth...

Page 77: ...H preset at 3 channel TLABK0005AJZZ No Label Dry Battery QCNW 8115AJZZ 75 Ohm Coaxial Cable RRMCG1264AJSA XA 920 RRMCG1263AJSA XA 905 Infrared Remote Control Unit SPAKX1091AJZZ Packing Add SPAKC4382AJZZ XA 920 SPAKC4383AJZZ XA 905 Packing Case Accessories TiNS 3786AJZZ Operation Manual XA 920 TiNS 3785AJZZ Operation Manual XA 905 TGAN 0001AJZZ Warranty Card U S A Only ...

Page 78: ...Ref No Part No Description Code Ref No Part No Description Code 87 XA 905 XA 920 ...

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 TQ0950 S Aug 2000 Printed in JAPAN NA DS XA 905 XA 920 ...

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Sharp XA-905, Service Manual, Page: 68 / 79

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