tandberg 6000x-servicemanual 维修电路原理图.PDF

JANDBERG Serles 6OOOX SER/IGEMANUAL :.:-!,.,r/ g /r l 3(r i.- I l :t(.;iJ,i i l. , TANDBERGS RADIOFABRIKK A/S - t, CONTENTS 1.0Mechanical Adjustments 1.1 Clutches 1.1.1 Take-up Trrntable 1.1.2 Supply Trrntable 1.2 Brakes 1.3 Pressure Pad Adjustment 1.4 End Stop Mechanism 1.4.1 Tape Feeler Tension 1.4.2 Adjustment of Tape Feeler Alignment 2.1 Demagnetizing 2.2 Bias- and Erase Circuits 2.2.1 Oscillator Frequency 2.2.2 Erase Voltage 2.2.3 Bias Current Tape Path 3.1 Visual Check 3.2 Mechanical Adjustment of Tape Path Head Alignment with Tandberg Test Tapes Model 6041X 4.1 Playback Head 4.1.1 Height Adjustment 4.1.2 Azimuth Adjustment 4.2 Record Head 4.2.1 Height Adjustment by Visual Inspection 4.2.2 Height Adjustment by Track Measurement 4.3 Bias Head 4.3.1 Vertical Adjustment 4.3.2 Height Adjustment 4.3.3 Horizontal Adjustment 4.4 Erase Head 4.4.1 Height Adjustment 4.4.2 Azimuth Adjustment 4.5 Model6021X Head Alignment Without Tandberg Test Tapes, Model 6041X 5.1 Playback Head 5.1.1 Height Alignment 5.1.2 Azimuth Alignment 5.2 Record Head 5.3 Bias Head 5.4 Erase Head 5.4.1 Height Adjustment 5.4.2 Azimuth Adjustment 5.5 Model 6021X 7.0 Adjustment and Control of the Amplifiers 9 7.1.1 Playback Level Adjustment I 7.1.2 Adjustment of Bias Current 9 7.1.3 Record Level Adjustment 9 7.1.4 Record/Playback Curves I 7.1.5 Indicator Adjustment in Record Mode 9 7.1.6 Distortion I 7.1.7 Indicator Adjustment in Playback and Amplifier Modes 9 7.1.8 Control of the Playback Amplifier I 7.2 Tape Speed Control 10 7.2.1 Using Frequency Meter or Counter 10 7.2.2 Using Transformer and Vacuum Ttrbe Voltmeter 7.2.3 Using Tape of Known Length 8.0 Adjustment of the Amplifiers, without Tandberg Test Tapes 8.1 Playback and Record Level Adjustment 8.2 Record/Playback Curves 8.3 Readjustment of Record Levels and Indicators 10 8.4 Distortion 10 8.5 Control of Playback and Record Amplifiers 11 8.5.1 Playback Amplifier 11 8.5.2 Record Amplifier 11 8.6 Pick-up Amplifier Curve 11 8.7 Limiter 12 8.7.1 Adjustment of Limiting Threshold 72 8.7.2 Adjustment of Release Time 12 9.0 Modifications 9.1 Modification from 230/115V 50 Hz to 230/115V 60 Hz operation 9.2 Modification from Four-Track to Two-Track Venion 9.3 Important Electrical Modifications Introduced in Series 6000X 10.0 Lubrication 11.0 Illustrations with Reference Part Numbers 12.0 Spare Parts List for Tandberg Tape Recorder 6000X 12.1 Mechanical Parts 12.2 Screws, Washers, Nuts and Circlips 12.3 Electrical Components 12.3.1 Transistors 12.3.2 Diodes 12.3.3 Rectifier 1 2.3.4 Trimming Capacitor 12.3.5 Poientiometers 12.3.6 Heads 12.3.7 Transfonners 13.0 Transistor and Diode Identification 14.0 Block Diagram Series 6000X 15.0 Printed Wiring Boards and lViring Diagram 2.0 3.0 4.0 I I I tt I 10 10 10 10 10 t2 13 5.0 13 13 I4 1.7 77 2L 21 2L 22 22 9 ,t 22 22 23 23 24 6.0 Track Control 6.1 Model 6041X 6.1.1 Record Head 6.1.2 Erase Head 6.1.3 Playback Head 6.2 Model 6021X 6.2.1 Erase Head 6.2.2 Record Head 6.2.3 Playback tlead 1.0 1.1 MECHANICAL ADJUSTMENT Clutches 1.1.1 Take-up Turntable Normal Forward drive Set the operating lever to normal forward drive position with the motor running. Ensure that the clearance between 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 in fig. 1.1. 1 991 034 0,5-0.9 mm L 0.02-0.35) I - Control of Winding Torque Note: All controls and measurements must be carried out with the tape recorder placed in horizontal posi- tion and with empty reels only. The control is accomplished as shown in fig. 1.2, which presents two optional modes of control. Fig. 1.2 Control of winding force. Normal forward drive mode. Fast Forward Winding Control of Fast Winding Torque Set the operating lever to fast forward winding position. The control is accomplished as shown in fig. 1.3, which presents two optional modes of control, - il 991017 991013 Fig.1.1 .rl 30 mm radius Force: 4O-80g 80 mm radius While measuring, the reel should be allowed to have a slow rotation. The instrument should follow the movement in a straight line towards the tape recor- der. Notc: After a longer period of continuous operation, an increase of the torque by 20-30V is considered as normal. Force: 15-30g .arl 4 +i I 30 mm radius Fig. 1.3 Control of fast winding torque. Fast forward winding mode 80 mm radius t If the torque deviates figure, check and, if spring 2673738. from the specifications in the necessary, alter the pressure of Ensure that there is a clearance between the studs on friction disc 991010 and lever 991013. See fig. 1.4. 1.1.2 Supply Turntable Control of Tape Tightening Tension Set the operating lever to normal forward drive position. The control is accomplished as shown in fig. 1.5, which presents two optional modes of control. min 0,1 mm (0.091) 991017 991013 991OlO 261805 Fig. 1.4 F Force: 90-2509 30 mm radius Force: O-99o 80 mm radius While measuring, the reel should be allowed to have a slow rotation. The instrument should follow the movement in a straight line towards the tape recorder. F Fig. 1.5 Control of tape tightening tension. Normal forward drive mode. Fast Reverse Winding Control of Fast Reverse Winding Torque Set the operating lever to fast reverse winding position. The control is accomplished as shown in fig. 1.6, which presents two optional modes of control. 30 mm radius 80 mm radius Force: 90-250g Force: 240-67 0g Fig. 1.6 control of fast reverse winding torque. Fast reverse winding mode J 1F If the torque deviates from the specifications in the figure, check and, if necessary, alter the pressure of spring 261805. See fig. 1.7. The difference between Fast Winding Torque and Fast reverse Winding Torque should be lesi than 180 g (force measured at 30 mm radius), or 50 g (measured at g0 mm 1a-dius! If necessary, alter the p.esiu.e of spring 261g0b (fig. 1.7), or spring 2673738 (fig. 1.1). 1.2 Brakes See fig. 1.8. Set the operating lever to normal forward drive position. Check that the clearance between the brake pad and the tumtable is approx. 1 mm (0.04). If necesiary, adjust screw D. Set the operating lever to fast forward winding or fast reverse winding respectively. Ensure that the clearance between screw C and the bottom of the hinged delrin parts 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 Adjustment Set the operating lever to neutral position. The clearance between the pressure pad 990325 and the tape rest 254844 should be approx. 6,5 mm (1/4) as shown in fig. 1-.!. If necessary, adju,st the clearance by bending the arm 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 the tape rest slould be 80 g (2.8 oz) ! tO 7o, measured on the end of the pressure pad arm 254025. See fig. 1.11. If necessary, adjust the pressure by bending the spring 268062 with-a pair of pliers. See fig. 1.12. Fig. 1.7 .)fl Fig. 1.8 991Ol7 (0.02-0.04) i)c I - ; 251489 A 6,5 mm (1/4). Fig. 1.9 Fig. 1.10 1.4 End StoP Mechanisrn 1.4.1 TaPe Feeler Tension The feeler tension against the tape shouldlay.between 8 ; i; to.ie-o.fs o) in aii and. winding modes Adiustment of the tensioit ii accomptishgd-u.v tightening ;i;t;iline.plg 243eeo see fig 114 1.4.2 Adlustment of TaPe Feeler See fig. 1.13 and 1.14 S.; il: operating lever in normal forward drive position or forward or reverse winding Th-e mains.switch is set to bN.ff;di .rura ;-;e;hd rhe tape reeler will ir,i;i; T;-i; *,J-poiitirr Yh:T-ll3 motor is ffi; oii. p.ro tt t!tet slowlv- through the guide oost. When the rear tla f the feeler-is min 05 mm id;t;ii* ttt porislea-ontact surface of the guide i.,1t*-;#qt.lF*iml*n3iiil.n;i not, loosen screw r.i until the motor startJ- when the tape feeler is in the ,i.iirJiiiiria uu irten tighten - the screw When fi; iirt it released, the microswitch should open and stop the motor when the spacing. between the tape feeler and the arm 244694A- is minimum ( 05 mm (0.02). See fig. 1.14. 80 g (2.82 oz) 1 t0% Fig. 1.11 Min 0,5 mm 0.02) F !f Fig. 1.13 DF Fig. 1.12 Fig. 1.14 2.0 ALIGNMENT It is-important that the contact between the tape and the heads on.the tape recorder is good. To obtain optimum results on new tapes, the tape should be run through the tape recorder approx. 5 times at normal speed to have the tape polished before measuring the friquency res- ponse and the signal-to-noise ratio. 2.1 Demagnetizing Demagnetize the heads and adjacent parts before aligning the heads. 2.2 Bias- and Erase Circuits 2.2.1 Oscillator Frequency Connect a calibrated long wave receiver (tuned to 256.5 kHz), frequency meter or frequency counter to the oscillator by means of a pick-up loop placed around the erase head. Adjust the oscillator frequency to 8b.b kHz by mens of C404. 2.2.2 Era* Voltage Set the tape recorder for stereo recording and connect a VTVM to upper half of the erase head by means of a low-capacitance probe. The voltage should be 80-120V. Then check that the same voltage appears across lower headhalf. Set the tape recorder for recording on channel L and check the voltage across upper half of the erase head. The deviation from the voltage measured in stereo recording should not exceed 10V. Proceed similarly for recording on channel R. 2.2.3 Btas Current Set the tape recorder for stereo recording and measure the voltage across upper half of the bias head by means of a VTVM. Adjust the voltage to 22Y by means of R407. Check the voltage across lower head-half and adjust to 22Y by means of R410. Demagnetize heads and tape path. 3.2 Mechanical adjustment of tape path Prior to the electrical adjustment of the heads, it is essential to make the tape run without sideways move- ment through the path. Set the operating lever to neutral position. Unscrew the screw holding latch 215563 to allow the latch to settle in the position determined by spring 284478. Then tighten the screw. The spring pressure will now be equal against the_ upper and lower points of pressure roller pivot 247941. Put a tape free from damages on the recorder in normal way and set the operating lever to normal forward drive position, Adjust the azimuth position of pressure roller 99033.1 with a screw driver as shown in fig. 3.2, until the tapg ls running evenly through the rest of the tape path, $ightly touching on-e of the flanges of the tape post 1 located adjacent to the capstan. Align guide post 2, 3, and 4 similarly. If necessary, adjust pressure roller spring 234478 to make the tape run perfectly. - -<l 3.0 TAPE PATH 3.1 Visual Check Load the recorder with a t-ape, and move the operating lever dowly to the normal forward drive position. Checi that the bias head neither touches the height adjustment screws (C) on the record head base plate, nor presses the tape against the record head. Also check thit the bias head is parallel to the record head. Operate the start/stop button, and check that the tape runs within the rims of the pressure wheel rubber without flickering on neither side of the pressure wheel. Check that height positioning of the guide posts is cor:ect. It can be tolerated that the tape touches the flanges of the guide posts when the recorder is in normal forward drive, or as the drive mechanism is engaged. The tape must, however, by no means bulge at the flanges. ln IHMD Fig. 3.1 Tape path adjustment screws Fig. 3.2 Azimuth adjustment of pressure roller rll - (?4; 4.0 HEAD ALIGNMENT WITH TANDBERG TEST TAPES, MODEL 6041X 4.1 Playback Head Set the recorder for stereo playback and connect a VTVM to each one of the phono outputs. 4.1.1 Height Adiustment Play Tandberg test tape No. 1. This is a full track prerecorded tape with 1.000 Hz recorded at 7 ll2 ips, and with the area corresponding to track 3 reduced by approx. 30 dB. Adjust the height of the playback head by means of the screws (A) until minimum output is obtained from track 3 (channel R), while endeavourlng to maintain the headfront parallel to the tape. 4.1.2 Azlmuth Adjustment Play Tandberg test tape No. 2. This is a full track prerecorded tape with 10 000 or 15 000 Hz recorded at 7 tl2 ips. Adjust the azimuth position of the playback head by means of the screw (B), until maximum indication on the VTVM is obtained. 4.2 Record Head 4.2.1 Height Adiustment by Visual Inspection Insert a new tape, and start the recorder in normal forward drive. Check visually that the tape appears to run parallel with the upper track of the record head, with a play of approx. 0,1 mm (4 mils). If necessary, adjust the height with screws (C) fig. 3.1, while endeavouring to maintain the headfront parallel to the tape. 4.2.2Heighl Adiustment by Track Meaurement Record in stereo, well above normal level, first in one direction, then in the opposite. Cut off a length of tape and dip it into a solution of fine grained iron oxyde powder and alcohol (Magna See). The tracks will then be visible as four dark stripes with spacings in lighter shade. Fig.6.1 shows the correct pattern on the tape and the patterns obtained when the head is positioned either too high or too low. Adjust as above and perform a new track measurement. 4.2.3 Azimuth Adiustment Load a new tape into the tape recorder and record at tape speed 7 Ll2 ips, a 15 000 Hz signal in stereo. Depress both playback buttons and turn both playback volume potentiometers to maximum. Adjust both Line Record l,evel knobs for approx. 150 mV at the outputs. Adjust the record head azimuth screw for maximum output from both channels simultaneously or best compromise. 4.3 Bias Head 4.3.1 Vertical Adiustment Move the operating lever slowly to the normal forward drive position and check that the head fronts of bias- and record heads are parallel. If necessary, bend the arm of the bias head as required. 4.3.2 Height Adjustment Set the tape recorder in record mode, and unscrew the locking screw (H) fig. 3.1, about 1/2 turn. Connect a VTVM across each one of the record head halves. Move the bias head up or down by means of adjustment screw M for the highest possible reading on the voltmeter. Check that the tape runs freely in the groove in front of the bias head and that there is sufficient clearance between the bias head and the mounting plate for the record head. The height position of the bias head is not critical, and if the clearance between the bias head and the mounting plate for the record head is insufficient, raise the bias head slightly. 4.3.3 Horizontal Adjustment Connect a VTVM across each one of the record headhalves, and set the tape recorder for stereo record- ing. Insert a screwdriver in groove I, ref. fig. 3.1, and pull the bias head to the right. Then pull the bias head carefully by means of the screwdriver towards the left hand side. Induced voltage (bias) in recording head increases to a maximum. Co