tandberg 3000x-servicemanual 维修电路原理图.PDF

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1、TANDBERG Series SOOOX SERVICE MANUAL ; ir-I t ; ll -: I TANDAERG oc reCOAO LEEL ryr; A *q r ruc t - ; TANDBERGS RADIOFABRIKK A/S - - A a .G. Contents F 1.0 TECHNICAL SPECIFICATIONS 2.0 MECHANCIAL ADJUSTMENTS 2.1 Clutches .:. 2.1.1 Take-up Turntable 2.1 .2 Take-up Turntable 2.1.3 Supply Turntable 2.1

2、.4 Supply Turntable 2.2 Brakes 2.3 Pressure Pad Adiustment . . 2.4 End Stop Mechanism . 2.4.1 Tape Feeler Tension 2.4.2 Adjustment of Tape Feeler 3.0 ALIGNMENT . 3.1 Demagnetlzing 3.2 Blas- and Erase Circuits 3.2.1 Oscillator Frequency . . . 3.2.2 Erase Voltage 3.2.3 Bias Current 4.0 TAPE PATH 4.1 V

3、isual Check 4.2 Mechanlcal adjustment ol tape path . . . 5.0 HEAD ALIGNMENT WITH TANDBERG TEST TAPES, MODEL 3041X 5.1 Playback head 5.1.1 Height Adjustment 5.1.2 Azimuth Adjustment 5.2 Record Head . 5.2.1 Height Adlustment by Visual Inspection 5.2.2 Height Adjustment by Track Measurement . . 5.2.3.

4、Azimuth Adjustment . 5.3 Bias Head 5.3.1 Vertical Adjustment . 5.3.2 Height Adjustment 5.3.3 Horizontal Adjustment 5.4 Erase Head . 5.4.1 Height Adjustment 5.4.2 Azimuth Adjustment 5.5 Model 3021X . 6.0 HEAD ALIGNMENT WITHOUT TANDBERG TEST TAPES, MODEL 3041X 6.1 Playback Head . 6.1.1 Height Alignmen

5、t 6.1.2 Azimuth Alignment . . 6.2 Record Head . 6.3 Bias Head 6.4 Erase Head . 6.4.1 Height Adjustment 6.4.2 Azimuth Adjustment 6.5 Model 3021X . 7.0 TRACK CONTROL 7.1 Model 3041X . 7.1.1 Record Head 7.1.2 Erase Head . 7.1.3 Playback Head 7.2 Modell 3021X . 7.2.1 Erase Head . 7.2.2 Record Head 7.2.3

6、 Playback Head 8.0 ADJUSTMENT AND CONTROL OF THE AMPLIFIERS . 11 8.1.1 Playback Level Adjustment . 11 8.1.2 Adjustment of Bias Current . 11 8.1.3 Record/Playback Level Adiustment 11 8.1.4 Record/Playback Curves . . 11 8.1.5 Distortion . 11 8.1.6 Control of Playback Amplifier . 1l 8.2 Tape Speed Cont

7、rol . 12 8.2.1 Using Frequency Meter or Counter 12 8.2.2 Using Transformer and Vacuum Tube Voltmeter . . . 12 8.2.3 Using Tape of Known Length . 12 9.0 RECORD/PLAYBACK CURVES . 12 9.1 Readjustment ol Record/Playback Level 12 9.2Dlstortlon. .12 9.3 Control of Playback and Record Ampliliers . . 12 9.3

8、.1 Playback Amplifier . . 12 9.3.2 Record Amplifier . 13 10.0 MoDrFtcATroNS . 15 10.1 Modilications from 11511301230/240 V, 50/60 Hz Operation . . . 15 10.2 Modification lrom Four-Track to Two- TrackVersion. .15 10.3 Component Modification in Series 3000X 15 11. LUBRTCATTON . . 15 12.0 ILLUSTRATIONS

9、 WITH REFERENCE PART NUMBERS . . 16 13.0 SPARE PARTS LIST FOR MODEL 3OOOX . 22 13.1 Mechanical Parts . . . 22 13.2 Electrica! Components . . . . 26 14.0 TABLE OF TRANSISTORS USED IN MODEL 3OOOX 15.0 BLOCK DIAGRAM FOR MODEL SOOOX . . 28 16.0 PRINTED WIRING BOARDS AND WIRING DIAGRAM 16.1 European Vers

10、ion 16.2 U.S. Version 10 10 10 10 11 11 11 11 11 4 4 4 4 4 4 5 6 6 6 6 7 7 7 7 7 7 8 8 8 I I 9 9 9 9 9 I 9 9 9 9 I I 10 10 10 10 10 10 10 10 10 10 10 10 28 30 1.0 TECHNICAL SPECIFICATIONS POWER REQUIREMENTS: 115-130-230-240 V. 50 or 60 Hz operation. See chapter 10.1 for voltage connections. POWER CO

11、NSUMPTION: 45 watts. MOTOR: Asynchronous. TAPE SPEED: 17le ips, 33/r ips and 7tlz ips. TAPE: Maximum reel diameter 7. Low Noise Tape only should be used for recordinq and for adjustment procedure. WINDING TIMES: 1200 ft. of tape; 131 min. 1800 ft. of tape: 2t/z min. PLAYING TIME, Two track recording

12、 on 1800 ft. of tape. MODEL 3021X: Stereo Mono 7t/z ips: 48 min. 2 x 48 min. 33/,r ips: 96 min. 2 x 96 min. 17la ips: 192 min. 2 X 192 min. PLAYING TIME, Four track recording on 1800 ft. of tape. MODEL 3041X: Stereo Mono 71/z ips: 2 x 48 min. 4 x 48 min. 33/r ips: 2 x 96 min. 4 x 96 min. 17le ips: 2

13、 x 192 min. 4 x 192 min. SPEED TOLERANCE: -+ 1,50/0. HEADS: Separate heads for erasure, recording, playback and bias (Tandberg Cross-field). FREQUENCY RESPONSE: 7t/z ips: 40-20.000 Hz -+ 2dB 33/r ips: 50-16.000 Hz -+- 2dB 17e ips: 50- 9.000 Hz -+ 2dB Measured to DIN 45511: 7t/z ips: 4O-22.0O0 Hz 33/

14、r ips: 40-18.000 Hz 17la ips: 40-10.000 Hz Amplifier position: 50-18.000 Hz -+ 3 dB ERASE AND BIAS 85,5 kHz. Distortion less than 0,5 %. FREQUENCY: INDICATORS: Moving coil meters. Optimum recording level: Deflection up to 0 dB at maxi- mum 3 o/o distortion. AMPLIFIER DISTORTION: Record Amplifier: Re

15、cording of a 400 Hz signat at 0 dB level, gives less than 0,5 0/o distortion from recording amplifier. Playback Amplifier: 0,3 0/o distortion at 0, 75 V output voltage. TAPE DISTORTION: A tape recorded with a 40O Hz signal at 0 dB level, gives less than 30/o tape distortion in playback. A tape recor

16、ded with a 400 Hz signal 8 dB below 0 dB on indicator, gives less than 0,8 0/o tape distortion in playback. Wl cl A C ! ( fi ( i - a WOW: W. R. M. S.: 7t/z ips - better than 0,07 o/o 33/r ips - better than 0,140/o 17le ips - better than 0,280/o DtN 45511 : 71/z ips - better than 0,1 o/o 33/r ips - b

17、etter lhan O,2o/o 17le ips - better than 0,40lo CROSSTALK At 1OOO Hz: ATTENUATION: Mono ) 60 dB Stereo ) SO OA INPUTS: Each channel has the following inputs: 1. Microphone input for dynamic low impedance microphone. lmpedance: 200-700 ohm. Sensitivity at 400 Hz: 0,1 mV. Maximum input level: 25 mV. D

18、IN socket. US-version, Telephone jack. 2. Line input for high impedance source. lmpedance: 1 Mohm. Sensitivity at 400 Hz: 100 mV. Maximum input level: 20 V. Phono sockets, LINE lNpUTS. 3. Line input for low impedance source. lmpedance: 57 kohm. Sensitivity at 400 Hz: 5 mV. Maxirnum input level: 1 V.

19、 DIN socket RADIO: Pin 1, left channel: Pin 4, right channel. US-version: Phono sockets LOW lN. OUTPUTS: Emitter follower outputs, RADIO DIN socket pins 3 and 5. US-version: phono SocKetS, OUTPUT LEFT and RIGHT. Minimum load impedance: 100 ohm. Output level: A tape recorded with 400 Hz signal at 0 d

20、B level, gives approx. 0,75 V in playback. HEADPHONES, stereo jack for connection of headphones. Stereo jack is connected in parallel with RADIO socket pins 3 and 5. On US- version stereo jack is connected parallel with phono sockets OUTPUT LEFT and RIGHT. SfGNAL TAPE/NOISE Peak value measured accor

21、ding to DIN 45511 at tape speed 71/z ips and 5olo WEIGHTED tape distortion: (GERAUSCHSPANNUNG): 4-track 2-track 54 dB 56 dB SIGNAL TAPE/NOISE Peak value measured according to DIN 45511 at tape speed 7t/z ips and 5o/o UNWEIGHTED distortion: (FREMDSPANNUNG): 4-track 2-track 51 dB 51 dB SIGNAL/TAPE NOI

22、SE: Measured linear R.M.S. at tape speed 7lz ips and 5 o/o distortion: 4-track 2-track 57 dB s7 dB SfGNAL/TAPE NOISE: Measured at tape speed 7t/z ips and 5 0/o distortion: Wetonreo 4-track z-track (lEC A-CURVE) R. M. S.: 62 dB 64 dB Note: At 3 0/o distortion all signal to noise ratio measurements (S

23、ignal/tape noise) are reduced by 2 dB. DfMENSIONS: Length: 151/2 (39,4 cm), heigth: 6t/2 (16,5 cm) and depth: 123la (31,6 cm). WEIGHT: 20 lbs (9,1 kg). 2.0 MECHANICAL ADJUSTMENTS 2.1 Glutches Control of Winding Torque Note: All controls and measurements must be car- ried out with the tape recorder p

24、laced in horizontal position and with empty reels only. All controls are accomplished as shown in tig. 2.2 which presents two optimal modes of control. Take-up turntable is shown. By con- trol of supply turntable, reverse the figure. 2.1.1 Take-up Turntable Normal Forward Winding Torque Set the oper

25、ating lever to Normal Forward drive position v.rith the motor running. The torque is read in table tig. 2.3, pos. 1. Ensure that the clearance 991017 9910r3 261841 2673?38 2640834 991009 Fig. 2.1 . between the polyurethane friction pads under the turntable and friction disc 991009 lays between 0,5-O

26、,9 mm (0.02-0.035). lf necessary, adjust screw A as shown in fig. 2.1. 2.1.2 Take-up Turntable Fast Forward Winding Torque The torque is read in table fig. 2.3, pos. 3. lf the torque deviates from the specifications in the table, check and, if necessary, alter the pressure of spring 263737B. Ensure

27、that there is a clearance between the studs on bushing 2640834 and lever 991013. See fig. 2.4. 2.1.3 Supply Turntable Tape Tension The torque is read in table fig. 2.3, pos 2. 2.1.4 Supply Turntable Fast Reverse Winding Torque The torque is read in table fig. 2.3, pos. 3. lf the torque deviates lrom

28、 the specifications in the table, check and, if necessary, alter the pressure of spring 2618054. See fig. 2.5. The difference between Fast Winding Torque and Fast Reverse Winding Torque should be less than 1309 (measured at 30 mm radius), or 509 (measured at 80 mm radius). lf necessary, alter the pr

29、essure ot spring 261805A (fig. 2.5), or spring 2673738 (fig. 2.1). * 1 Pot 2 Pot 3 ,l I a I i ( i t t 0.5 - 0,9mm (0.02t - 0.035r ) 30 mm radius80 mm radius Fig2.2. Table for Winding Torques Torque at 30 mm radius Torque at 80 mm radius 159- 309- tit winding Pos 2 tape rensron Fast winding Fig. 2.3.

30、 * After a longer periode of continuous operation, an increase of the torque by 2G-30 0/o is considered as normal. C Ensure that the torque is within the specifications in the table by running the tape recorder in verti- cal position, and with a tull 7 reel on take-up turntable. o- 8g Pos 3 909-250g

31、 t I 264930 991 01 ? Fig. 2.6. 2.2 Brakes See fig. 2.6 Set the operating lever to Normal Forward drive position. Check that the clearance between the brake pad and the turntable is approx 1 mm (0.04). lf necessary, adjust screw D. Set the operating lever to Fast Forward Winding or Fast Reverse Windi

32、ng position respectively. Ensure that the clearance between screw C and the bottom of the hinged delrin parts on operating arm 991017 lays between 0,5-1 mm (0.02-4.O4 ). lf necessary, adjust screw C. The adjustment procedure is equal for both turn- tables. 251489 A Fig. 2.7. min 0,lmm (0.004,) Fig.

33、2.4. 261 805A Fig. 2.5. 2.3 Pressure Pad Adjustment Set the operating lever to Neutral position. The clearance between the pressure pad 990325 and the tape rest 254844A should be approx. 6,5 mm (tlr) as shown in fig. 2.7. lf necessary, adlust the clearance by bending the arm 254025 with a pair of pl

34、iers. See fig. 2.8. Fig. 2.8. Set the operating lever to Normal Forward drive position. The pressure at the pad against the tape rest should be 80 g (2,8 ozl -+ 10 0/0, measured on the end of the pressure pad arm 254025. See fig. 2.9. lf necessary, adjust the pressure by bending the spring 268062 wi

35、th a pair of pliers. See fig. 2.10. 2.4 End Stop Mechanism 2.4.1 Tape Feeler Tenslon The feeler tension against the tape should lay be- tween 8 and 10 g (0.28-0.35 oz) in drive winding modes. Adjustment of the tension is accomplished by tightening or slackening the spring 243990. See lig. 2.12. Fig.

36、2.10. 2.4.2 Adjustmenl of Tape Feeler See fig. 2.11 and 2.12. Set the operating lever to Normal Forward drive posi- tion. The mains switch is set to ON. No tape should be inserted. The tape feeler will therefore rest in the position where the motor is switched off. Push the feeler slowly through the

37、 guide post. When the rear side of the feeler is min. 0,5 mm (0.02) from the polished tape contact surface of the guide post, loosen screw F, and move the microswitch slowly until the motor starts when the tape feeler is in the position specified above. Then tighten the screw. When the tape feeler i

38、s released, the microswitch should open, and switch off the motor current when the space between the tape feeler and the arm 266741 is minimum 0,5 mm (O.O2). See fig. 2.12. Check the switching on and-off positions of the tape feeler at both fast winding modes. I l1 a ( t a I a zzl /: (, 12.82 ozl !

39、l, a- ,-/ 80s 252754 tM3l4 Fig. 2.9. Adjustment distance Juste ringsavstand minimum 0,5 mm (0,02rr) 266741 Min 0,5 mm (o.02 l Fig. 2.12. 243990 Fig. 2.11. 3.0 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 tape

40、s (Low Noise), the tape should be run through the tape recorder approx. 5 times at normal speed to have the tape polished before measuring the frequency response and the signal-to-noise ratio. v 3.1 Demagnetizang Demagnetize the heads and adjacent parts before aligning the heads. Move the demagnetiz

41、ing coil slowly past the head gap at short distance. The head surface must on no account be touched, as scratches are detrimental to the performance. Hold the demagnetizing coil near the capstan for a few seconds. Start the tape recorder and hold the demagnetizing coil right above the flywheel. Note

42、: Do not switch off the demagnetizer until it is at least 3 feet away from the tape recorder. 3.2 Bias- and Erase Circuits 3.2.1 Oscillalor 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

43、 around the erase head. Adjust the oscillator frequency to 85.5 kHz by means of C 508. 3.2.2 Erase 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 80-120 V. Then check ihat the same volta

44、ge appears across lower head-half. 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 10 V. Proceed similarly for recording on channel R. 3.2.3 Bias Current Set the

45、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 22 Y by means of R 501 . Check the voltage across lower head-half and adjust to 22 Y by means of R 502. Demagnetize heads and tape path. 4.0 TAPE PATH 4.1 Visual Ch

46、eck Load the recorder with a tape, and move the operating lever slowly to the normal forward drive position. Check 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 that the bias head is paralle

47、l to the record head. Operate the start/stop knob, 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 correct. lt can be tolerated that the tape touches the flanges of

48、 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. 4.2 Mechanical Adjustment of Tape Path Prior to the electrical adjustment of the heads, it is essential to make the tape run without sideways

49、 movement through the path. 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 990334 with a screw driver as shown in tig. 4.2, until the tape is running evenly through the rest of the tape path, slightly touching one of the flanges of the guide post 1 located adjacent to the capstan. Align guide posts 2, 3, and 4 similarly.