Tandberg-6000X-tape-sm 维修电路原理图.pdf

《Tandberg-6000X-tape-sm 维修电路原理图.pdf》由会员分享，可在线阅读，更多相关《Tandberg-6000X-tape-sm 维修电路原理图.pdf（30页珍藏版）》请在收音机爱好者资料库上搜索。

1、JANDBERGSerles 6OOOXSER/IGEMANUAL:.:-!,.,r/g /rl3(r i.- I l:t(.;iJ,i il. ,TANDBERGS RADIOFABRIKK A/SRadioFans.CN 收音机爱 好者资料库-t,CONTENTS1.0Mechanical Adjustments1.1 Clutches1.1.1 Take-up Trrntable1.1.2 Supply Trrntable1.2 Brakes1.3 Pressure Pad Adjustment1.4 End Stop Mechanism1.4.1 Tape Feeler Tension

2、1.4.2 Adjustment of Tape FeelerAlignment2.1 Demagnetizing2.2 Bias- and Erase Circuits2.2.1 Oscillator Frequency2.2.2 Erase Voltage2.2.3 Bias CurrentTape Path3.1 Visual Check3.2 Mechanical Adjustment of Tape PathHead Alignment with Tandberg Test TapesModel 6041X4.1 Playback Head4.1.1 Height Adjustmen

3、t4.1.2 Azimuth Adjustment4.2 Record Head4.2.1 Height Adjustment byVisual Inspection4.2.2 Height Adjustment byTrack Measurement4.3 Bias Head4.3.1 Vertical Adjustment4.3.2 Height Adjustment4.3.3 Horizontal Adjustment4.4 Erase Head4.4.1 Height Adjustment4.4.2 Azimuth Adjustment4.5 Model6021XHead Alignm

4、ent Without Tandberg Test Tapes,Model 6041X5.1 Playback Head5.1.1 Height Alignment5.1.2 Azimuth Alignment5.2 Record Head5.3 Bias Head5.4 Erase Head5.4.1 Height Adjustment5.4.2 Azimuth Adjustment5.5 Model 6021X7.0 Adjustment and Control of the Amplifiers 97.1.1 Playback Level Adjustment I7.1.2 Adjust

5、ment of Bias Current 97.1.3 Record Level Adjustment 97.1.4 Record/Playback Curves I7.1.5 Indicator Adjustment in Record Mode 97.1.6 Distortion I7.1.7 Indicator Adjustment in Playbackand Amplifier Modes 97.1.8 Control of the Playback Amplifier I7.2 Tape Speed Control 107.2.1 Using Frequency Meter or

6、Counter 107.2.2 Using Transformer and Vacuum TtrbeVoltmeter7.2.3 Using Tape of Known Length8.0 Adjustment of the Amplifiers, withoutTandberg Test Tapes8.1 Playback and Record Level Adjustment8.2 Record/Playback Curves8.3 Readjustment of Record Levels andIndicators 108.4 Distortion 108.5 Control of P

7、layback and Record Amplifiers 118.5.1 Playback Amplifier 118.5.2 Record Amplifier 118.6 Pick-up Amplifier Curve 118.7 Limiter 128.7.1 Adjustment of Limiting Threshold 728.7.2 Adjustment of Release Time 129.0 Modifications9.1 Modification from 230/115V 50 Hzto 230/115V 60 Hz operation9.2 Modification

8、 from Four-Trackto Two-Track Venion9.3 Important Electrical ModificationsIntroduced in Series 6000X10.0 Lubrication11.0 Illustrations with Reference Part Numbers12.0 Spare Parts List for TandbergTape Recorder 6000X12.1 Mechanical Parts12.2 Screws, Washers, Nuts and Circlips12.3 Electrical Components

9、12.3.1 Transistors12.3.2 Diodes12.3.3 Rectifier1 2.3.4 Trimming Capacitor12.3.5 Poientiometers12.3.6 Heads12.3.7 Transfonners13.0 Transistor and Diode Identification14.0 Block Diagram Series 6000X15.0 Printed Wiring Boards and lViring Diagram2.03.04.0IIIttI1010101010t2135.01313I41.7772L212L22229,t22

10、222323246.0 Track Control6.1 Model 6041X6.1.1 Record Head6.1.2 Erase Head6.1.3 Playback Head6.2 Model 6021X6.2.1 Erase Head6.2.2 Record Head6.2.3 Playback tleadRadioFans.CN 收音机爱 好者资料库1.01.1MECHANICAL ADJUSTMENTClutches1.1.1 Take-up TurntableNormal Forward driveSet the operating lever to normal forwa

11、rd drive positionwith the motor running. Ensure that the clearancebetween the polyurethane friction pads under the turn-table and friction disc 991009 lays between 0,5-0,9 mm(0.02-0.035). If necessary, adjust screw A as shown infig. 1.1.1991 0340,5-0.9 mm L0.02-0.35) I -Control of Winding TorqueNote

12、: All controls and measurements must be carried outwith the tape recorder placed in horizontal posi-tion and with empty reels only.The control is accomplished as shown in fig. 1.2, whichpresents two optional modes of control.Fig. 1.2 Control of winding force. Normal forward drive mode.Fast Forward W

13、indingControl of Fast Winding TorqueSet the operating lever to fast forward winding position.The control is accomplished as shown in fig. 1.3, whichpresents two optional modes of control,-il991017 991013Fig.1.1.rl30 mm radiusForce:4O-80g80 mm radiusWhile measuring, the reel should be allowed to have

14、 aslow rotation. The instrument should follow themovement in a straight line towards the tape recor-der.Notc: After a longer period of continuousoperation, an increase of the torque by20-30V is considered as normal.Force:15-30g.arl4+iI30 mm radiusFig. 1.3 Control of fast winding torque. Fast forward

15、 winding mode80 mm radiustIf the torque deviatesfigure, check and, ifspring 2673738.from the specifications in thenecessary, alter the pressure ofEnsure that there is a clearance between the studs onfriction disc 991010 and lever 991013. See fig. 1.4.1.1.2 Supply TurntableControl of Tape Tightening

16、TensionSet the operating lever to normal forward drive position.The control is accomplished as shown in fig. 1.5, whichpresents two optional modes of control.min 0,1 mm(0.091)991017991013 991OlO 261805Fig. 1.4FForce:90-250930 mm radiusForce:O-99o80 mm radiusWhile measuring, the reel should be allowe

17、d to have a slow rotation. The instrument should follow themovement in a straight line towards the tape recorder.FFig. 1.5 Control of tape tightening tension. Normal forward drive mode.Fast Reverse WindingControl of Fast Reverse Winding TorqueSet the operating lever to fast reverse winding position.

18、The control is accomplished as shown in fig. 1.6, whichpresents two optional modes of control.30 mm radius80 mm radiusForce:90-250gForce:240-67 0gFig. 1.6 control of fast reverse winding torque. Fast reverse winding modeJ1FIf the torque deviates from the specifications in thefigure, check and, if ne

19、cessary, alter the pressure ofspring 261805. See fig. 1.7.The difference between Fast Winding Torque and Fastreverse Winding Torque should be lesi than 180 g (forcemeasured at 30 mm radius), or 50 g (measured at g0 mm1a-dius! If necessary, alter the p.esiu.e of spring 261g0b(fig. 1.7), or spring 267

20、3738 (fig. 1.1).1.2 BrakesSee fig. 1.8.Set the operating lever to normal forward drive position.Check that the clearance between the brake pad and thetumtable is approx. 1 mm (0.04). If necesiary, adjustscrew D.Set the operating lever to fast forward winding or fastreverse winding respectively. Ensu

21、re that the clearancebetween screw C and the bottom of the hinged delrinparts on operating arm 991012 lays between 0,b-1 mm(0.02-0.04). If necessary, adjust screw C.The adjustment prosedure is equal for both turntables.1.3 Pressure Pad AdjustmentSet the operating lever to neutral position. The clear

22、ancebetween the pressure pad 990325 and the tape rest254844 should be approx. 6,5 mm (1/4) as shown infig. 1-.!. If necessary, adju,st the clearance by bending thearm 254025 with a pair of pliers. See fig. 1.10.Set the operating lever to normal forward drive position.The pressure of the pad against

23、the tape rest slould be80 g (2.8 oz) ! tO 7o, measured on the end of thepressure pad arm 254025. See fig. 1.11. If necessary,adjust the pressure by bending the spring 268062 with-apair of pliers. See fig. 1.12.Fig. 1.7.)flFig. 1.8991Ol7 (0.02-0.04)i)cI-;251489 A6,5 mm (1/4).Fig. 1.9Fig. 1.101.4 End

24、StoP Mechanisrn1.4.1 TaPe Feeler TensionThe feeler tension against the tape shouldlay.between 8; i; to.ie-o.fs o) in aii and. winding modesAdiustment of the tensioit ii accomptishgd-u.v tightening;i;t;iline.plg 243eeo see fig 1141.4.2 Adlustment of TaPe FeelerSee fig. 1.13 and 1.14S.; il: operating

25、lever in normal forward drive positionor forward or reverse winding Th-e mains.switch is set tobN.ff;di .rura ;-;e;hd rhe tape reeler willir,i;i; T;-i; *,J-poiitirr Yh:T-ll3 motor isffi; oii. p.ro tt t!tet slowlv- through the guideoost. When the rear tla f the feeler-is min 05 mmid;t;ii* ttt porisle

26、a-ontact surface of the guidei.,1t*-;#qt.lF*iml*n3iiil.n;inot, loosen screw r.iuntil the motor startJ- when the tape feeler is in the,i.iirJiiiiria uu irten tighten - the screw Whenfi; iirt it released, the microswitch should openand stop the motor when the spacing. between the tapefeeler and the ar

27、m 244694A- is minimum ( 05 mm(0.02).See fig. 1.14.80 g (2.82 oz) 1 t0%Fig. 1.11Min 0,5 mm0.02)F !fFig. 1.13DFFig. 1.12Fig. 1.142.0 ALIGNMENTIt is-important that the contact between the tape and theheads on.the tape recorder is good. To obtain optimumresults on new tapes, the tape should be run throu

28、gh thetape recorder approx. 5 times at normal speed to havethe tape polished before measuring the friquency res-ponse and the signal-to-noise ratio.2.1 DemagnetizingDemagnetize the heads and adjacent parts before aligningthe heads.2.2 Bias- and Erase Circuits2.2.1 Oscillator FrequencyConnect a calib

29、rated long wave receiver (tuned to 256.5kHz), frequency meter or frequency counter to theoscillator by means of a pick-up loop placed around theerase head. Adjust the oscillator frequency to 8b.b kHzby mens of C404.2.2.2 Era* VoltageSet the tape recorder for stereo recording and connect aVTVM to upp

30、er half of the erase head by means of alow-capacitance probe. The voltage should be 80-120V.Then check that the same voltage appears across lowerheadhalf.Set the tape recorder for recording on channel L andcheck the voltage across upper half of the erase head.The deviation from the voltage measured

31、in stereorecording should not exceed 10V. Proceed similarly forrecording on channel R.2.2.3 Btas CurrentSet the tape recorder for stereo recording and measurethe voltage across upper half of the bias head by meansof a VTVM. Adjust the voltage to 22Y by means ofR407. Check the voltage across lower he

32、ad-half andadjust to 22Y by means of R410. Demagnetize heads andtape path.3.2 Mechanical adjustment of tape pathPrior to the electrical adjustment of the heads, it isessential to make the tape run without sideways move-ment through the path.Set the operating lever to neutral position. Unscrew thescr

33、ew holding latch 215563 to allow the latch to settle inthe position determined by spring 284478. Then tightenthe screw. The spring pressure will now be equal againstthe_ upper and lower points of pressure roller pivot247941.Put a tape free from damages on the recorder in normalway and set the operat

34、ing lever to normal forward driveposition, Adjust the azimuth position of pressure roller99033.1 with a screw driver as shown in fig. 3.2, until thetapg ls running evenly through the rest of the tape path,$ightly touching on-e of the flanges of the tape post 1located adjacent to the capstan.Align gu

35、ide post 2, 3, and 4 similarly. If necessary, adjustpressure roller spring 234478 to make the tape runperfectly.-l3.0 TAPE PATH3.1 Visual CheckLoad the recorder with a t-ape, and move the operatinglever dowly to the normal forward drive position. Checithat the bias head neither touches the height ad

36、justmentscrews (C) on the record head base plate, nor presses thetape against the record head. Also check thit the biashead is parallel to the record head.Operate the start/stop button, and check that the taperuns within the rims of the pressure wheel rubberwithout flickering on neither side of the

37、pressure wheel.Check that height positioning of the guide posts iscor:ect. It can be tolerated that the tape touches theflanges of the guide posts when the recorder is in normalforward drive, or as the drive mechanism is engaged. Thetape must, however, by no means bulge at the flanges.lnIHMDFig. 3.1

38、 Tape path adjustment screwsFig. 3.2 Azimuth adjustment of pressure rollerrll-(?4;4.0 HEAD ALIGNMENT WITH TANDBERGTEST TAPES, MODEL 6041X4.1 Playback HeadSet the recorder for stereo playback and connect aVTVM to each one of the phono outputs.4.1.1 Height AdiustmentPlay Tandberg test tape No. 1. This

39、 is a full trackprerecorded tape with 1.000 Hz recorded at 7 ll2 ips,and with the area corresponding to track 3 reduced byapprox. 30 dB. Adjust the height of the playback headby means of the screws (A) until minimum output isobtained from track 3 (channel R), while endeavourlngto maintain the headfr

40、ont parallel to the tape.4.1.2 Azlmuth AdjustmentPlay Tandberg test tape No. 2. This is a full trackprerecorded tape with 10 000 or 15 000 Hz recorded at7 tl2 ips. Adjust the azimuth position of the playbackhead by means of the screw (B), until maximumindication on the VTVM is obtained.4.2 Record He

41、ad4.2.1 Height Adiustment by Visual InspectionInsert a new tape, and start the recorder in normalforward drive. Check visually that the tape appears torun parallel with the upper track of the record head, witha play of approx. 0,1 mm (4 mils). If necessary, adjustthe height with screws (C) fig. 3.1,

42、 while endeavouring tomaintain the headfront parallel to the tape.4.2.2Heighl Adiustment by Track MeaurementRecord in stereo, well above normal level, first in onedirection, then in the opposite. Cut off a length of tapeand dip it into a solution of fine grained iron oxydepowder and alcohol (Magna S

43、ee). The tracks will then bevisible as four dark stripes with spacings in lighter shade.Fig.6.1 shows the correct pattern on the tape and thepatterns obtained when the head is positioned either toohigh or too low.Adjust as above and perform a new track measurement.4.2.3 Azimuth AdiustmentLoad a new

44、tape into the tape recorder and record attape speed 7 Ll2 ips, a 15 000 Hz signal in stereo.Depress both playback buttons and turn both playbackvolume potentiometers to maximum. Adjust both LineRecord l,evel knobs for approx. 150 mV at the outputs.Adjust the record head azimuth screw for maximumoutp

45、ut from both channels simultaneously or bestcompromise.4.3 Bias Head4.3.1 Vertical AdiustmentMove the operating lever slowly to the normal forwarddrive position and check that the head fronts of bias- andrecord heads are parallel. If necessary, bend the arm ofthe bias head as required.4.3.2 Height A

46、djustmentSet the tape recorder in record mode, and unscrew thelocking screw (H) fig. 3.1, about 1/2 turn. Connect aVTVM across each one of the record head halves. Movethe bias head up or down by means of adjustment screwM for the highest possible reading on the voltmeter.Check that the tape runs fre

47、ely in the groove in front ofthe bias head and that there is sufficient clearancebetween the bias head and the mounting plate for therecord head. The height position of the bias head is notcritical, and if the clearance between the bias head andthe mounting plate for the record head is insufficient,

48、raise the bias head slightly.4.3.3 Horizontal AdjustmentConnect a VTVM across each one of the recordheadhalves, and set the tape recorder for stereo record-ing. Insert a screwdriver in groove I, ref. fig. 3.1, and pullthe bias head to the right.Then pull the bias head carefully by means of thescrewd

49、river towards the left hand side.Induced voltage (bias) in recording head increases to amaximum. Continue pulling the head towards left sideuntil the bias is reduced by 10-15 7o below maximum.When the position has been found, thigthen the screw(H) while maintaining correct horizontal position of the

50、head. Then recheck the output voltage. If a noticeablechange has occured, the horizontal procedure has to berepeated.4.4 Erase Head4.4.1 Height AdjustmentBy visual inspection, check that approx. 0,25 mm (10mils) of the upper half of the erase head is visible abovethe tape. Insert Tandberg test tape