SERVICE MANUAL
Contents
1. R344 LI5M R x C325 44 NES 100 BS j 100 X oo V BC147B 0305 C 1498 Ns R341 R343 NOTES EVE SOARD TOP PLATE MARKING 1 TEGER REAR PANEL MARKING FREQ ADJ PRESET CONTROL TEST POINT i 024 CONNECTION TERMINAL L UPPER TRACK gt LEFT CHANNEL R LOWER TRACK RIGHT CHANNEL SIGNAL PATH PLAYBACK SIGNAL PATH RECORD DEPOSITED CARBON RESISTORS CAPASITORS INOICATED IN pF UNLESS OTHERWISE SPECIFIED 1000 000 pF RESISTORS INDICATED IN OHMS UNLESS OTHERWISE SPECIFIED k 1000 OHMS 1000 000 OHMS VOLTAGES GIVEN IN PARANTHESIS REFER TO RECORD POSITION RECORD 52 SELECTOR LEFT SWITCHES ARE SHOWN IN UNOPERATED POSITION 3 1 0 7 EQUALIZATION SWITCH RIGHT 401 402 S403 301 302 303 230V S0Hz 240V 50Hz 2 115V SOHz 130 50Hz TRANSFORMER AND MOTOR CONNECTIONS 7 SENSITIVITY O AT 400Hz 1 5 7 100 Ke 5 RECORD 90 VOLT Tandbergs Radiofabrikk A S WIRING DIAGRAM FOR 1 TAPE RECORDER SERIES 3000 1 MIC JACK DRAWING NO 15811 3 11 12 69 GS 16 1 70 HP 6 3 70 GG 3 11 70 PF Board for record and playback equalizing amplifiers level indicator amplifiers and booster amplifiers Printed si2. Too high Too low AG He UA A Correct Fig 7 2 Track measurement of erase head ie ae GE Ga 5 jt d n it It 7 1 3 Playback Head Record 1 000 Hz signal on track 1 channel L and a 500 Hz signal on track 3 channel R well above optimum recording levels Set OUTPUT selector to position STEREO Turn the tape around and play back track 2 channel No signal should be heard Raise the playback head if the 1 000 Hz signal is heard Lower the playback head if the 500 Hz signa is heard Recheck the azimuth position 7 2 Model 3021X 7 2 1 Erase Head The height of the erase head is aligned by the adjustment screws K and L ref fig 4 1 Record a 1 000 Hz signal in stereo well above optimum recording level on a full track prerecorded tape Dip the tape in the Magna See solution and check that the tracks are distributed symmetrically across the tape Readjust the erase and the record heads if necessary 7 2 2 Record Head The height of the record head is aligned by the height adjustment screws Record 1 000 Hz signal in stereo well above optimum recording level on full track prerecorded tape Dip the tape Magna See solution and check that the tracks are distributed symmetrically across the tape Readjust the erase and the record heads if necessary 7 2 3 Playback Head The height of the playback head is aligned by the
3. 9 5 3 1 Vertical Adjustment 9 5 8 2 Height Adjustment 9 5 3 3 Horizontal Adjustment 9 5 4 Erase Head 5 41 Height Adjustment 42 03 5 42 Azimuth Adjustment 10 5 5 Model 3021X 10 6 0 HEAD ALIGNMENT WITHOUT TANDBERG TEST TAPES MODEL 3041X 10 6 1 Playback Head 10 6 1 1 Height Alignment 10 6 1 2 Azimuth Alignment 10 6 2 Record Head 10 6 3 Bias Head 10 6 4 Erase Head 10 6 4 4 Height Adjustment 10 6 4 2 Azimuth Adjustment 10 6 5 Model 3024X 10 7 0 TRACK CONTROL 10 71 Model 3041X 10 7 1 4 Record Head 10 74 2 Erase Head 2 us 10 7 1 8 Playback Head 11 7 2 Modell 3021X 11 7 2 1 Erase Head 11 7 2 2 Record Head 11 7 2 8 Playback Head 11 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 Adjustment 11 8 1 4 Record Playback Curves 11 8 1 5 Distortion NOR inte 11 8 1 6 Control of Playback Amplifier
4. 991014 991013 240276A 270821 266741 265096 264270 263709 273134 260045 201957 263932 265060A 268422 211418 264054 266309 272050 267416 Fig 12 10 Top view with covers removed 260512 263601A 11 260512 991014 A ss N B ML 261 920 262193B ES 991014 991013 991013 224795 991015 259529 a 2 E 991023 259529 991031 261051 991030 991017 R 208 991400 991402 264996 990312 266238 Fig 12 11 Top view with upper mounting plate removed 13 0 SPARE PARTS LIST FOR SERIES 3000X The numbers of the mechanical parts on figures are identical with the part numbers in store Part shown on figures without existing in the parts list are not available as spare parts alone 13 1 Mechanical Parts Part No Description Fig Ref Notes 201957 202008 202151 202309 203250 204013 207977 208724 209306 210622 211339 211418 212036 212066 214270 214895 215053 216734 218767 219234 219816 224795 229565 230183 230629B 234478 234960 235420 236045 236159 240276 240406 240879 241009 242331 242503 243013 243150 243940 243990 Shaft for pressure pad arm Mains cable 115 V 7FT Microswitch RX1 for end stop Shaft for eccentric segment Mains cable 230 V 220 cm w nluq Washer 7 5 X 4 2 X 0 5 mm turbax Delrin roller for indexing eccent segment Cl
5. 11 8 2 Tape Speed Control 12 8 2 1 Using Frequency Meter or Counter 12 8 2 2 Using Transformer and Vacuum Tube Voltmeter 8 2 3 Using Tape of Known Length 12 9 0 RECORD PLAYBACK CURVES 12 9 1 Readjustment of Record Playback Level 12 92 Distortion 12 9 3 Control of Playback and Record Amplifiers 12 9 3 1 Playback Amplifier 12 9 3 2 Record Amplifier 13 10 0 MODIFICATIONS 15 10 1 Modifications from 115 130 230 240 V 50 60 Hz Operation 15 10 2 Modification from Four Track to Two Track Version 15 10 3 Component Modification in Series 3000X 15 11 LUBRICATION 15 12 0 ILLUSTRATIONS WITH REFERENCE PART NUMBERS 16 13 0 SPARE PARTS LIST FOR MODEL 3000X 22 13 1 Mechanical Parts 22 13 2 Electrical Components 26 14 0 TABLE OF TRANSISTORS USED IN MODEL 3000X 15 0 BLOCK DIAGRAM FOR MODEL 3000X 28 16 0 PRINTED WIRING BOARDS AND WIRING DIAGRAM 16 1 European Version 28 16 2 U S Version 30 1 0 TECHNICAL SPECIFICATIONS POWER REQUIREMENTS POWER CONSUMPTION MOTOR TAPE SPEED TAPE WINDING TIMES PLAYING TIME MODEL 3021 PLAYING TIME MODEL 3041 SPEED TOLERANCE HEADS FREQUENC
6. 9 1 Readjustment of Record Playback level For readjustments of Record Playback level ref paragraph 8 1 3 9 2 Distortion Ref paragraph 8 1 5 for adjustment and control of distortion 9 3 Control of Playback and Record Amplifiers If the specified tolerances for frequency response are exceeded check the playback and record amplifiers 9 3 1 Playback Amplifier Insert a 22 ohm resistor in series with playback head and junction 52 59 Connect a signal generator in series with a 1 kohm resistor and a 100 uF capacitor and playback head see fig 9 1 Connect also VTVM to each of the outputs and set output selector to position STEREO To ensure correct signal response apply oscilloscope Tune the generator to 400 Hz and adjust the level 20 dB below 0 75 V ie 75 mV Check the frequency response according to fig 9 2 d 9 3 2 Record Amplifier Connect VTVM to 100 ohm resistor in series with the record head and ground as shown in fig 9 3 and R332 432 a signal generator to HIGH Input for each channel Shortcircuit trimming capacitor C508 in oscillator Set the tape recorder for stereo recording Set the level 30 dB below 0 dB indicator deflection i e 10 dB down by means of Record Level Controls 20 dB down on signal generator and use 400 Hz as reference on VTVM deflection Check the frequency response according to fig 9 4 Remove shortcircuit of C508 Q305 0405 head Fig 9 3 100 uF 52 5
7. m s gt E Board for mic lire amplifiers buffer amplifiers oscillator bias and DC voltage regulator Printed side 1 TSA31 10411 1 10 t Board for mic lire amplifiers buffer amplifiers oscillator bias and DC voltage regulator Printed side MIC LINE AMP BUFFER AMP EQUALIZED RECORD PREAMP LEVEL IND AMP T Q402 Bc 108 I l e I I I CL 8C1078 mc a St T elr te eh s 0779 4 R33 C 319 5 I 2 I C309 C318 ol 86142 I 2 2 x I un x a 312 022 8325 R327 R328 C315 C317 I 001 CER SOUND ON SOUND RECORD q e 4 s AND ECHO SELECTOR HEAD LC 8 EQUALIZED PLAYB BOOSTER 3 56 55 LEVEL IND L PLAYBACK D 65 164 0 LEVEL IND 8 ADJ 0505 1478 0874 17V t0 7vh 52 R515 0506 BC147B u I TRANSF gt imd 1000 p I I ON Z OFF I 230 GND 50Hz Q304 BC147B 2 7 acusa f Y PLAYBACK HEA R D
8. C420 1 25 39 I 8 I I I bit PLAYBACK HEAD RECORD LEVEL HEAD Q 2 IND 2 0 begun Seca BIAS HEAD L C m 515759 i PUT AD I UR 435 t I ERASE 1 HEAD I I I I HEAD 1 GND 1 77 ppm METER lt gt LEVEL IND 2 R GND 470 020 8C147B SOUND ON SOUND SELECTOR 55 C310 I r I 25 I 0301 BCIL8A 15753 Ei 470 0303 CL 8 1078 REC LEVEL 5 ADJ R c v EZ 9 R333 C319 22 BCI47B 158 32 39 R335 Losk I C320 25 C322 330 PLAYBACK HEAD R q 0 2 GR BOOSTER EQUALIZED PLAYB AMP BC147B C430 0068 18 EJ o O 10 9 1 1 t 1 Q 9 9 59 9 KES o LI PLAYBACK HEAD 09 ao eee Sn ETT DC VOLTAGE REGULATOR 27V 2N4919 02 148 17V 5 2V 067V 0 7 R515 820 507 Q506 8C 28 0505 8 1478 ee om
9. 12 10 12 9 12 4 12 4 12 3 12 2 12 6 12 2 12 3 12 11 12 5 12 6 12 6 12 7 12 8 12 4 12 1 12 4 4 2 12 4 12 9 12 9 12 10 12 6 12 6 12 4 12 10 12 6 12 10 2 12 12 5 RA 244342 246231 247395 247941 248027 248157 248351 249068 249630 251130 251489 252115 252172 252496 252754 254025 254779 254844 257517 259529 259758 259773 260045 260289 260290 260325 260361 260512 260577 260620 260641 260700 260735 260929 260965 261051 2610948 261216 261303 261460 261525 261655 261805 261841 261885 261920 261970 261992 262021 262064 262193B 262258 262322 262402 262416 262481 262509 Description Fig Ref Notes Lever for end stop switch Clamp for end stop switch wires Clip 9mm 3 for wires Shaft for pressure roller Insulator for end stop switch Bushing for adj of tape guide Motor pulley 60 Hz Box for motor Connector for microphone and head set Lever for pressure pad arm Tape support left Equalization switch Lower bearing for flywheel Clamp link equal switch Tape guide adjustable Pressure pad arm Power transformer Support for pressure pad amp tape Drive belt for counter Lamp for counter and meter 24 V1W Phono connector for input board Bracket for fastening input board Instrument record and playback level indicator Side plate right Tape support r
10. 991006 Front tape path cover Valid below ser no 2733265 991007 Rear tape path cover Valid below ser no 2733265 991008 Supply turntable 2 5 12 2 12 10 991009 Right clutch disc 2 1 12 3 991010 Left clutch disc 12 2 991013 R amp L clutch lever w screw 2 1 12 2 12 3 12 10 12 11 991014 amp L brake lever w screw 2 6 12 10 12 11 991015 Releasing arm w pulling rod 12 11 991017 Arm for clutch and brake slide 2 1 2 6 12 11 991018 Cueing arm 991021 Left turntable brake spring w pad 991022 Right turntable brake spring w pad 991023 Flywheel brake spring w pad 12 11 991024 Thrust spring for capstan 991025 Housing for turntable bearing 991026 Vertical mounting leg w rubber feet 991027 Upper flywheel bearing compl 12 5 12 6 991028 Record interlock plate w shaft 12 6 991030 Operating lever w ball 12 11 991031 Lamp holder for rev counter 12 11 991033 Mylar sheet w felt 2 1 12 3 991034 Take up turntable 2 1 2 6 12 3 12 10 991035 Tape tightening disc Right 2 1 12 3 512 tape path cover 127 Valid above ser no 2733265 car tape pat Cover 1 Valid above ser no 2733265 991041 Rubber drive belt 12 10 pg 991042 Housing for rubber foot 12 8 991046 Trafo for oscillator T501 12 8 991400 Board main amplifier 12 9 12 11 991401 Board connectors 12 9 991402 Board rectifier oscillator 12 9 12 11 991404 Set of knobs compl 991406 Pressure roller arm compl 12 4 Won Screws Washers Nuts an
11. Q408 3000X BC 148A Q409 3000X BC 107B Nc Ref Description Q501 3000X 2 4921 0502 3000 2 4918 0503 3000X BC 147B Q504 3000X BC 147B Q505 3000X BC 147B Q506 3000X BC 147B 0507 3000 107 0508 3000X 2N 4919 Diodes Description Notes 3000X IN 4148 Zener diode 27 V 3000X 1N 52548 3000X 1N 4148 Potentiometers Description Notes R108 3000X 10 kohm Pos log R208 3000X 10 kohm Pos log R333 3000X 10 kohm Linear 8351 3000X 10 kohm Linear R433 3000X 10 kohm Linear R451 3000 10 kohm Linear R501 3000X 250 kohm Pos log R502 3000X 250 kohm Pos log Trimming Capacitors Ref No Description C508 3000X 150 750pF 14 0 TABLE OF TRANSISTORS USED IN MODEL 3000X TRANSISTOR S Q 8 ECB CB HANNEL REF NO Gd Ge Ge Gd QQ cm L C 0101 0102 0103 8C1498 8C2098 R C201 0202 Q203 149 209 L Q405 Q406 149 BC2098 R Q305 Q306 149 209 0104 0404 0407 BC147B BC107B BC207B 0204 0304 0307 BC147C 107 BC207C L BC107B BC107C L Q401 Q402 Q408 een Q301 0302 Q308 86208C o e o Ds BC147B 1078 BC207B BC147C BC107C BC207C BC1478 BC107B BC207B BC147B BC107B 2078 147 107 BC207C Note Two or more types of trans
12. TANDBERG Series 3000X SERVICE MANUAL TANDBERG TANDBERGS RADIOFABRIKK A S Contents 1 0 TECHNICAL SPECIFICATIONS 2 2 0 MECHANCIAL ADJUSTMENTS 4 2 1 Clutches 4 2 1 1 Take up Turntable 4 2 1 2 Take up Turntable 4 2 1 3 Supply Turntable 4 2 1 4 Supply Turntable 4 22 Brakes 220222222 eive 5 2 3 Pressure Pad Adjustment 6 2 4 End Stop Mechanism 6 2 4 4 Tape Feeler Tension 6 2 4 2 Adjustment of Tape Feeler 6 3 0 ALIGNMENT 7 3 1 Demagnetizing 7 3 2 Bias and Erase Circuits 7 3 2 1 Oscillator Frequency 7 3 2 2 Erase Voltage 7 3 2 3 Bias Current 7 40 TAPE PATH 8 4 1 Visual Check 8 4 2 Mechanical adjustment of tape path 8 5 0 HEAD ALIGNMENT WITH TANDBERG TEST TAPES MODEL 3041X 9 5 1 Playback head 9 5 1 1 Height Adjustment 9 5 1 2 Azimuth Adjustment 9 5 2 Record Head 9 5 2 1 Height Adjustment by Visual Inspection 9 5 2 2 Height Adjustment by Track Measurement vos 9 5 2 3 Azimuth Adjustment 9 5 3 Bias Head
13. at 7 2 ips tape speed Difference from correct tape speed is indicated Tolerance 1 5 o 8 2 2 Using Transformer and Vacuum Tube Voltmeter Connect a transformer 115 0 5 V or 230 0 5 V 50 60 Hz and VTVM to Output and the mains as shown in fig 8 1 dotted line indicates phono socket on US version Set OUTPUT selector to position L Play back Tandberg test tape 10 mains frequency 50 Hz or 19 mains frequency 60 Hz at 77 2 ips tape speed Deviation from correct tape speed will give a beat across the VTVM Clock the time for 10 complete excursions of the meter needle Read the speed deviation in per cent corresponding to this particular time from the nomogram in fig 8 2 Brake left hand turntable slightly to decide if tape speed is too high or too low Increased deviation indicates too low tape speed At 33 4 ips play Tandberg test tape No 10 b 50 Hz mains frequency Proceed as for 77 2 ips to find speed accuracy Speed tolerance 1 5 V T V M 115 V 60 Hz or 230V 50Hz TO OUTPUT gt 500r60Hz Fig 8 1 30 25 20 15 10 05 04 03 Speed deviation Time in secands for 10 complete 6 10 15 20 25 30 40 50 5066 excursions Fig 8 2 8 2 3 Using Tape of Known Length Insert a tape of known length 450 1144 cm and play it back Time taken for the whole fength should be 7 2 ips 60 seconds 33 4 ips 120 seconds 17 ips 240 seconds
14. ref fig 4 1 This adjustment is not critical 5 5 Model 3021X The alignments specified in para 5 0 are valid for the model 3021X with the exception of paragraph 5 1 1 which is superseded by 6 1 1 and paragraph 5 21 which is superseded by 7 22 6 0 HEAD ALIGNMENT WITHOUT TANDBERG TEST TAPES MODEL 3041X 6 1 Playback Head 6 1 1 Height Alignment The height of the playback head is aligned by the height adjustment screws A ref fig 4 1 The upper edge of the tape shall run flush with the upper part of the head lamination for channel L 6 1 2 Azimuth Alignment Set OUTPUT selector to position STEREO Play back standard azimuth alignment tape with a VTVM connected to each output Adjust the posi tion of the playback head by the azimuth adjustment screw B ref fig 4 1 until maximum reading is obtained on the output meters 6 2 Record Head Follow the instructions given under paragraph 5 2 6 3 Bias Head Follow the instructions given under paragraph 5 3 6 4 Erase Head 6 4 1 Height Adjustment The height of the erase head is aligned by the height adjustment screws K and L ref fig 4 1 Approx 0 25 mm 10 mils of the ferrite core for the upper track of the erase head should be visible above the tape 6 4 2 Azimuth Adjustment Align the azimuth position of the erase head by the azimuth adjustment screws K The erase head should be parallel with the mounting plate for the heads The
15. signal at 0 dB 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 Peak value measured according to DIN 45511 at tape speed 77 2 ips and 5 tape distortion 4 track 2 track 54 dB 56 dB Peak value measured according to DIN 45511 at tape speed 7 2 ips and 59 distortion 4 track 2 track 51 dB 51 dB Measured linear R M S at tape speed 77 2 ips and 5 distortion 4 track 2 track 57 dB 57 dB Measured at tape speed 77 2 ips and 5 distortion 4 track 2 track 62 dB 64 dB Note At 3 o distortion all signal to noise ratio measurements Signal tape noise are reduced by 2 dB Length 15 2 39 4 cm heigth 6 2 16 5 and depth 123 31 6 20 Ibs 9 1 kg 2 0 MECHANICAL ADJUSTMENTS 2 1 Clutches Control of Winding Torque Note All controls and measurements must be car ried out with the tape recorder placed in horizontal position and with empty reels only All controls are accomplished as shown in fig 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 operating lever to Normal Forward drive position with the motor running The torque is read in table fi
16. 0309 C333 8c1078 533 9 5 MEET PLATE MARKING 1 REAR PANEL MARKING FREQ ADJ PRESET CONTROL 7 TEST POINT 22 024 CONNECTION TERMINAL L UPPER TRACK LEFT CHANNEL R LOWER TRACK RIGHT CHANNEL SIGNAL PATH PLAYBACK SIGNAL PATH RECORD DEPOSITED CARBON RESISTORS CAPASITORS INDICATED IN pF UNLESS OTHERWISE SPECIFIED 1000 000 pF RESISTORS INDICATED IN OHMS UNLESS OTHERWISE SPECIFIED k 1000 OHMS 1000 000 OHMS VOLTAGES GIVEN IN PARANTHESIS REFER 10 RECORD POSITION RECORD 52 SELECTOR Sd Sc Sb Sa RIGHT LEFT SWITCHES ARE 5 IN UNOPERATED POSITION 3 1 o EQUALIZATION SWITCH 5401 5402 5403 5301 5302 5303 t 0 0 230V 60Hz 230V 50Hz 240 50Hz 15 50Hz 130V 50Hz TRANSFORMER AND MOTOR CONNECTIONS MSV 60 Hz KM SENSITIVITY AT 400Hz i sos Tandbergs Radiofabrikk A S WIRING DIAGRAM FOR TAPE RECORDER SERIES 3000 X MIC DIN DRAWING NO 15800 2 14 1 69 AO 16 1 70 HP Pj 3 1 70 KA 16 2 U S Version MIC LINE AMP BUFFER AMP 470 Q104 BCI47B dr c em emus 1541 EQUALIZED RECORD PREAMP LEVEL IND AMP EQUA eae ee MIELE I iN IL 15753 1 1 caos 52 0 554 0040 I I
17. height adjustment screws A The tape shall run parallel with the upper edge of the lamination for channel L Readjust the azimuth position if necessary 8 0 ADJUSTMENT AND CONTROL OF THE AMPLIFIERS 8 1 1 Playback Level Adjustment Connect a VTVM to each one of the outputs and set OUTPUT selector to position STEREO Set the recorder for 77 2 ips playback of Tandberg test tape No 4 and adjust R451 L and R351 R for 0 7 V reading on both vacuum tube voltmeters 8 1 2 Adjustment of Bias Current Insert a new reel of good quality tape Low Noise Connect a VTVM to Output terminals and signal generator to HIGH Input terminals and set the generator for 1 000 Hz and 0 5 volt Set output selector to STEREO Set the tape recorder for stereo recording Adjust the Record Level Control to 75 mV deflection on VTVM Adjust R501 to maxi mum deflection on left channel VTVM and R502 to maximum on right channel VTVM Note The 2 track model is also equipped with individually tuned bias and erase heads The values of C502 C503 C515 and C516 are labelled on the bias and erase heads respec tively The capacitances are given in pF Upper number refers to upper track 8 1 3 Record Playback Level Adjustment Connect a VTVM to each one of the outputs Insert a new tape and record a 400 Hz signal from a gene rator at 7 2 ips A test OUTPUT selector to posi tion SOURCE Adjust the input levels for a VTVM indication of 0 7 volt at both
18. obtained when the head is positioned either too high or too low Adjust as above and perform a new track measure ment 5 2 3 Azimuth Adjustment Load a new tape into the tape recorder and record at tape speed 7 2 ips a 15 000 Hz signal in stereo Set OUTPUT selector to position STEREO Adjust both RECORD LEVEL knobs for approx 150 mV the output Adjust the record head azimuth screw D for maximum output from both channels simul taneously or best compromize 5 3 Bias Head 5 3 1 Vertical Adjustment 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 5 3 2 Height Adjustment Set the tape recorder in stereo record mode and unscrew the locking screw H fig 4 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 5 3 3 Horizontal Adjustment Connect a VTVM across each one of the recor
19. outputs Adjust R433 for a 0 dB reading on left record level indicator and R333 for the same reading on right indicator Set OUTPUT selector to position STEREO and adjust R451 L and R351 R to 0 7 V indication on VTVM 8 1 4 Record Playback Curves Ref paragraph 9 0 for control of record playback curves 8 1 5 Distortion Connect signal generator 400 Hz 0 5 V to High Input and distortion meter to outputs Record in B test on both channels OUTPUT selector to position STEREO Set the tape recorder for stereo recording Adjust Record Level controls to 0 dB deflection on indi cators Check distortion to be less than 3 If distortion exceeds 3 o readjust recording level and indicator ref paragraph 8 1 3 8 1 6 Control of Playback Amplifier Connect a VTVM to each one of the outputs OUTPUT selector to position STEREO Play back Tandberg test No 3 This is a full track prerecorded tape with the following frequencies 250 10 000 5 000 1 000 100 50 250 Hz recorded at 7 2 ips tape speed The tape conforms with the N A B standard The output tolerances are 10 kHz 0 4 dB 5 kHz 1 3 dB The other fre quencies have tolerances 2 dB The difference in level between the two channels should be less than 3 dB 8 2 Tape Speed Control 8 2 1 Using Frequency Meter or Counter Set OUTPUT selector to position L Connect a frequency meter or counter to Output L and play back Tandberg test tape No 11 1 000 Hz
20. 18 D90 03B C04 11R 990233 990213 990312 C03 10P 264866 991027 260735 262481 240267A 252754 264162 212747 260290 251498 243013 990325 242503 254025 990334 268062 265060A 262021 268422 251130 273407 219234 266791 EU VERS 229565 260577 991406 US VERS 249630 263493 266439 266827 266238 991028 261460 273939 230183 269801 268472 267416 Fig 12 6 Tape path and pressure roller arm 230629B 274162 DE Wa 00009008 TANDBERG RADIO TAPE RECORDER 1 MODEL 3043 269786 E e 2697786 x e e LEFT RIGHT 1 i TANDBERGS RADIOFABRIKK A S LINE INPUTS Rus f 208250 17 2665 10 269902 259758 Fig 12 7 Hear European version 202008 230629 TANDBERG TAPE RECORDER 269786 MODEL 3041 X OUTPUT VOLTS 05 FREQ 80 52 WATTS M X 45 HIGH IN MADE IN NORWAY ONS 991042 268221 261970A 269902 259758 991042 Fig 12 8 Rear view U S version 991402 264996 991046 260620 265735 212036 991400 269449 991401 269786 269902 252115 252496 241009 236159 249068 Fig 12 9 Bottom view 269 264 991 990 991 991 210 265 260 201 248351B 60 Hz 243940 50 Hz 991041 262969 262854 990204 990305 990330 991043 242331 269786 269786 264973 264973 991034 991008 990312 990233 991014
21. 25 and the tape rest 254844A should be approx 6 5 mm 4 as shown in fig 2 7 If necessary adjust the clearance by bending the arm 254025 with a pair of pliers See fig 2 8 254025 268062 990325 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 oz 10 measured on the end of the pressure pad arm 254025 See fig 2 9 If necessary adjust the pressure by bending the spring 268062 with pair of pliers See fig 2 10 251489A 252754 809 2 82 10 314 268062 254025 254844A 990325 Fig 2 9 2 4 End Stop Mechanism 2 4 1 Tape Feeler Tension The feeler tension against the tape should lay be tween 8 and 100 0 28 0 35 oz in drive winding modes Adjustment of the tension is accomplished by tightening or slackening the spring 243990 See fig 2 12 254025 268062 990325 Fig 2 10 2 4 2 Adjustment 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 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 spec
22. 32 Grommet for mains cable 26909 262739 Lower spring for operating lever 12 9 26911 262854 Speed selector arm 12 10 26925 262969 Bracket for speed selector 12 10 26944 262984 Screw 5 for cabinet 12 1 26977 263077 Spring for tape tightening disc 12 2 26978 263105A Upper side plate right 12 1 26980 263278 Bracket for power switch 26990 263393 Button for start stop and function 27046 select switch 12 1 27082 263443 Bracket for flywheel bearing 27205 263493A Button for recording right channel 27285 263522 Upper spring for operating lever 27313 263601A Arm brake left acetal 12 11 27340 263688 Screw 3 X 8 mm c sunk for rear 27355 cover plate 12 1 27393 263709 Button for power switch 12 10 Valid below ser no 2741076 2741 263874 Bushing for operating lever 2741 263888 Power switch without button 12 9 Valid below ser no 2741076 27455 263932 Guide for power switch button 12 5 12 10 Valid below ser no 2741076 27752 264003 Side plate left 9902 264054 Spring for bias head arm 12 10 99021 264075 Spring for clutch take up turntable 12 3 9902 264083A Bushing for friction disc 2 1 12 2 12 3 9903 264162 Rubber tape brake 12 6 99031 264226 Guide for slide arm 9903 264248 Button volume 12 1 9903 264270 Revolution counter 12 10 9909 264420 Sleeve for slide arm damping 9903 264435 Felt ring for volume knob 12 1 9910 264564 Rosewood cabinet 12 1 9910 264578 Bracket for operating lever 12 9 9910 264593 Bushing for operating lever
23. 9 Signal generator Fig 9 1 C421 R440 C421 C423 R439 R440 R443 Components connected at C421 C422 R440 R442 R443 all tape speeds e 71 2 ips 33 4 ips Fig 9 2 Playback curves 17 8 ips 20 Hz 50 100 200 500 1000 2000 5000 10000 20000 50000 Q R425 I O C413 426 L _O C412 C416 C417 R431 C415 R430 8 I Components connected at C414 R429 i Q all tape speeds 33 4 ips 17 8 ips Fig 9 4 Record curves 2000 5000 10000 20000 Fig 9 5 Total frequency response tolerances according to DIN 45511 10 10 0 5 10 1 Modification from 115 130 230 240 V 50 60 Hz Operation The transformer and motor must be rewired according to figures below when changing from 115 130 230 240 V operation When modifying from 50 to 60 Hz or vice versa the motor pulley has to be changed Motor pulley 50 Hz operation part number 243940 60 Hz operation part number 248351B When ordering motor pulley specify part number o o 230V 60Hz s 115V 60 Hz Motor and transformer connections Fig 10 1 10 2 Modification from
24. Four Track to Two Track Version The following components have to be changed when modifying from four track to two track Value of total capacitance is labelled on two track heads Part Four track Two track Record Head C04 11R F82 07R Record Head F53 11R F82 07R Playback Head C03 10P F83 11P Erase Head D84 18E D87 20E Erase Head G51 18E D87 20E Bias Head D90 03B D92 04B R432 5 6 2 7kohm R332 5 6kohm 2 7kohm C515 250pF a capacitance C516 250pF until labelled C502 3300pF C503 3300pF is obtained Valid on models below serial No 2733300 Valid on models above serial No 2733300 10 3 Component Modification in Series 3000X Transistor Q503 is changed from type 147 to BC107B Resistor R505 is changed from 22 kohm to 1 kohm Both modifications are introduced from serial number 2741500 R116 and R216 are changed from 1 kohm to 220 ohm C109 and C209 are changed from 6800 pF to 0 022 uF Both modifications are intro duced from serial number 2744100 11 0 LUBRICATION The Motor The motor should be lubricated after approximately every 3000 hours of use The upper and the lower bearing should be lubricated with Teresso oil 43 or 47 from Esso The Self Lubricating Bearings The turntables the flywheel and the speed transfer wheel are mounted in self lubricating bearings and should usually not be lubricated If however it should be necessary to lubricat
25. STEREO 5 1 1 Height Adjustment Play Tandberg test tape No 1 This is full track prerecorded tape with 1 000 Hz recorded at 77 2 ips and with 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 endeavouring to maintain the headfront parallel to the tape 5 1 2 Azimuth Adjustment Play Tandberg test tape No 2 This is a full track prerecorded tape with 10 000 or 15 000 Hz recorded at 71 5 ips Adjust the azimuth position of the play back head by means of the screw B until maximum indication on the VTVM is obtained 5 2 Record Head 5 2 1 Height Adjustment by Visual Inspection Insert 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 play of approx 0 1 mm 4 mils II necessary adjust the height with screws fig 4 1 while endeavouring to maintain the headfront parallel to the tape 5 2 2 Height Adjustment by Track Measurement Record in stereo well above normal level first in one direction then in the opposite Cut off a length of tape and it into solution of fine grained iron oxyde powder and alcoho Magna See The tracks will then by visible as four dark stripes with spacings in lighter shade Fig 7 1 shows the correct pattern on the tape and the patterns
26. Tolerance for all tape speeds 1 5 9 0 RECORD PLAYBACK CURVES Connect a VTVM to each one of the outputs L and R order to avoid interference from the oscillator voltage a band stop or a low pass filter tuned to 85 5 kHz must be inserted between the outputs and the voltmeters Set the tape recorder for stereo recording at 33 4 ips in B test STEREO and record on Low Noise Tape a 400 Hz signal at a recording level 30 dB below optimum 0 dB Use the output VTVM readings as reference levels Then record a 16 000 Hz signal at the same level and check that the output voltage is within 2 dB Perform fine adjustment of record head azimuth position If the voltage is too high increase bias current by means of R501 for channel L and R502 for channel R If the voltage is too low alter the input signal frequency to 1 000 Hz and adjust for maximum output voltage by means of R501 and R502 for channels L and R respectively Then go back to 400 Hz establish the reference level and recheck the output level at 16 000 Hz When the tolerance at 16 000 Hz has been met check that the output level at frequencies be tween 50 and 16 000 Hz do not deviate more than 2 dB from reference level Perform the same check for 77 2 ips at frequencies between 40 and 20 000 Hz and then finally check for 17 ips between 50 and 9 000 Hz Ref level 400 Hz The output levels of the two channels should not at any frequency differ by more than 3 dB
27. Y RESPONSE ERASE AND BIAS FREQUENCY INDICATORS AMPLIFIER DISTORTION TAPE DISTORTION 115 130 230 240 V 50 or 60 Hz operation See chapter 10 1 for voltage connections 45 watts Asynchronous 17 8 ips 33 4 ips and 7 2 ips Maximum reel diameter 7 Low Noise Tape only should be used for recording and for adjustment procedure 1200 ft of tape 13 4 min 1800 ft of tape 2 2 min Two track recording on 1800 ft of tape Stereo Mono 7 ips 48 min 2X 48 min 33 4 ips 96 min 2X 96 min 17 8 ips 192 min 2 X 192 min Four track recording on 1800 ft of tape Stereo Mono 7 ips 2X 48 min 4X 48 min 33 4 ips 2 X 96 min 4X 96 min 17 8 ips 2 X 192 min 4 X 192 min 1 5 Separate heads for erasure recording playback and bias Tandberg Cross field 7 2 ips 40 20 000 Hz 2dB 32 4 ips 50 16 000 Hz 2dB 17 ips 50 9 000 Hz 2dB Measured to DIN 45511 7 2 ips 40 22 000 Hz 33 4 ips 40 18 000 Hz 17 8 ips 40 10 000 Hz Amplifier position 50 18 000 Hz 3 dB 85 5 kHz Distortion less than 0 5 9 o Moving coil meters Optimum recording level Deflection up to 0 dB at maxi mum 3 distortion Record Amplifier Recording of 400 Hz signal at 0 dB level gives less than 0 5 distortion from recording amplifier Playback Amplifier 0 3 90 distortion at 0 75 V output voltage A tape recorded with a 400 Hz signal at 0 dB level gives less than 3 tape distorti
28. amp for mains cable Spring for transfer wheel arm Adjustment screw for bias head 3 x 18 mm Pulley for revolution counter Shaft for lever operating pressure pad arm Holder for operating lever ball Nut for mounting of cabinet Screw for adj plate spring pressure roller Washer 7 5 4 2 X 0 3 mm turbax Pulley for turntable Spring for cam disc Nut for turntable shaft Shaft for pressure roller arm assy Flange for turntable housing L amp R Support for PW board DIN connector for microphone Shield for playback head Roller for speed selector arm Spring for bias head adjustment Washer speed selector knob Shaft for start stop lever Adj plate for spring pressure roller Clamp for supporting motor Screw for end stop lever Spring for record playback head adjustment Bracket for transfer wire Motor 110 220 V Spring for cam disc arm Tape feeler for end stop mechanism Tape guide right Delrin arm for bias head adj Motor pulley 50 Hz Spring for tape feeler end stop mechanism 12 10 12 8 12 5 12 5 12 7 Ordering of Parts When ordering a mechanical part it is essential that the appropriate part number being used as a refe rence in this manual be specified For ordering of electrical components however the position number must be used Note If modifications according to list are introduced from a certain serial number this number must be specified 12 2 12 3 12 4 12 4 12 5 12 4 12 9
29. azimuth position of the erase head is not critical 6 5 Model 3021X The alignments specified in paragraph 6 0 are valid for model 3021X with the exception of paragraph 6 2 which is superseded by 5 2 Paragraph 5 2 1 is super seded by 7 2 2 Paragraph 6 4 1 is superseded by 7 2 1 7 0 TRACK CONTROL 7 1 Model 3041X 7 1 1 Record Head Record 1 000 Hz signal from generator well above optimum recording level in stereo Record on tracks 1 and 3 for approx 5 seconds Turn the tape and make similar recording on tracks 4 and 2 Cut the tape and it into mixture of fine grained iron oxyde powder and alcohol Magna See solution to make the recording visible The spaces between the recorded tracks should be distributed equidistant across the tape ref fig 7 1 Readjust the height position if necessary and recheck the azimuth alignment 7 1 22 Head Insert full track prerecorded tape and record 1 000 Hz signal from a generator well above optimum recording level in mono on track 3 channel R Cut the tape and dip it into the Magna See solution Check that the prerecorded track is in the centre of the erased area ref fig 7 2 Adjust the vertical position of the erase head if necessary high Too low AGE ALL GE T T ANGA HA I Correct Fig 7 1 Track measurement of record head 1 I IN NA
30. d head halves and set the tape recorder for stereo recording Insert a screwdriver in groove ref fig 4 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 Continue pulling the head towards left side until the bias is reduced by 10 15 below maximum When the position has been found tighten the screw H while maintaining correct horizontal position of the head Then recheck the output voltage If a noticeable change has occured the horizontal procedure has to be repeated 5 4 Erase Head 5 4 1 Height Adjustment By visual inspection check that approx 0 25 mm 10 mils of the upper half of the erase head is visible above the tape Insert Tandberg test tape 9 and record 400 Hz signal at 77 2 ips well above normal level on channel R track 3 Dip the tape in a solution of fine grained iron oxyde powder and alcoho Magna See solution Check that the recorded track is positioned in centre of the erased track Make sure that no parts of the adjacent tracks are erased see fig 7 2 If necessary adjust the height of the erase head by means of the screws K and L ref fig 4 1 and repeat the above check 5 4 2 Azimuth Adjustment Check that the head front of the erase head is perpendicular to the mounting plate If necessary adjust azimuth position by means of the screws K
31. d Circlips R Q Screws Washers Q 261885 2X5 mm 230542 23 mm DIN 6799 Q 214270 2 6 x 4mm 239651 3 2 mm DIN 6799 Q 270002 2 6 X 10 mm 204105 3 5 X 85 X 07 mm Q 210556 3x3 mm 235937 4 mm DIN 6799 Q 269255 3 x 4 mm 211441 42 X 7 5 X 02 mm Turbax Q 215951 3 x 5 mm 214895 4 2 X 7 5 X 0 3 mm Turbax 0 204809 3 x 8 mm 204013 4 2 X 7 5 X 05 mm Turbax 263688 3 x 8 mm 217856 5 2 X 7 5 X 02 mm Turbax 217632 3 X 10 mm 200299 52 x 7 5 X 0 5 mm Turbax Dio 261303 3 x 10 mm 261655 3 x 10 mm Nuts R 214336 3 x 12 mm 209566 26 mm 213918 3 x 15 mm D 210622 3 x 18 mm Circlips D 206908 3 X 20 mm 236346 2 mm t 232367 3 16 No 4 5122 221 Pot 200944 1 4 No 4 213826 Emm 231267 1 47 4 F 227899 1 4 No 6 TENE 218675 3 8 No 4 F 269298 1 2 No 2 F 262984 5 8 No 6 F 213767 3 4 No 4 F 264665 7 8 6 F Tri 13 2 Electrical Components Transistors Description Q101 3000X BC 149B Q102 3000X BC 149B 14 0103 3000X BC 149B Q104 3000X BC 147B 0201 3000X 8C 1498 0202 3000X 8C 1498 0203 3000X 1498 0204 3000X 8C 1478 0301 3000X BC 148A Q302 3000X BC 148A Q303 3000X BC 107B Q304 3000X BC 147B Q305 3000X BC 149B Q306 3000X BC 149B Q307 3000X BC 147B Q308 3000X BC 148A Q309 3000X BC 107B Q401 3000X BC 148A Q402 3000X BC 148A Q403 3000X BC 107 Q404 3000X BC 147B Q405 3000X BC 149B Q406 3000X BC 149B Q407 3000X BC 147B
32. de Input and output terminal board for channel L Printed side FLOW IN FHGH TN OUTPUT LLEFT J LEFT J L LEET J Input and output terminal board for channel R Printed side FLOW ON fH IN foUTPUT E C RIGHT LEG 3 Tandbergs Radiofabrikk A S Kjels s Tandbergs Radiofabrikk A S div Kjeller TANDBERGS RADIOFABRIKK A S 9 Korsvoll Oslo 8 Norway
33. e the bearings for any reason use Teresso oil 43 or 47 from Esso Note Utmost care must be taken while lubricating Use only one fractional drop of oil for each bearing Excessive oil might seriously affect the friction drive 12 0 ILLUSTRATIONS WITH REFERENCE PART NUMBERS 264248 261655 991038 260700 261655 991039 263688 262322 234960 260929 263688 264435 269255 IE gu 20165 nes AP 264786 274535 261655 263393 263105A 269255 273559 272854 266072 260641 268975 277523 261303 262984 264665 gt 262984 VERT MOUNT 262064 TEAK 264564 ROSE WOOD 269772 WALNUT 262984 264665 VERT MOUNT Fig 12 1 991008 260361A 991010 991013 264083A 261841 261805A d Fig 12 2 Supply turntable 991034 991035 991009 264075 991013 264083A A i 267373B i gt qel gt 204013 215053 Fig 12 3 Take turntable 266087 247941 235420 236045 210622 204013 1 1 214270 1 1 i 990334 234478 1 1 _ 8 amp 214895 T 78 243150 207977 262258 260577 991406 COMPLETE Fig 12 4 Pressure roller arm assembly 229565 263939 202151 207977 267768 202309 261094 265060A 262509 263932A 248027 990346 991027 24414342A 246231 248990 Fig 12 5 Upper mounting plate seen from underneath 25 21 251 99 25 26 254844 084
34. g 2 3 pos 1 Ensure that the clearance 991033 991035 991034 0 5 0 9mm 0 02 0 035 991017 991013 261841 267373B 264083A 991009 Fig 2 1 30 mm radius between the polyurethane friction pads under the turntable and friction disc 991009 lays between 0 5 0 9 mm 0 02 0 035 If necessary adjust screw 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 If the torque deviates from the specifications in the table check and if necessary alter the pressure of spring 263737B that there is clearance between the studs on bushing 264083A 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 If the torque deviates from the specifications in the table check and if necessary alter the pressure of spring 261805A See fig 2 5 The difference between Fast Winding Torque and Fast Reverse Winding Torque should be less than 130g measured at 30 mm radius or 50g measured at 80 mm radius If necessary alter the pressure of spring 261805A fig 2 5 or spring 267373B fig 2 1 80 mm radius 1 gt gt gt 9 Fig 2 2 ag ee ee I Table for Winding Torques Position of Torque at Torque at Right Left operating 30
35. ified above Then tighten the screw When the tape feeler is 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 0 02 See fig 2 12 Check the switching on and off positions of the tape feeler at both fast winding modes 11 w WW Min 0 5 mm 10 02 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 tapes 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 3 1 Demagnetizing Demagnetize the heads and adjacent parts before aligning the heads Move the demagnetizing 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 Do not switch off the demagnetizer until it is at least 3 feet away from the tape recorder Adjustment distance ini 0 5 mm 0 02 Justeringsavstand DES 266741 243990 Fig 2 12 3 2 Bias and Erase Circuits 3 2 1 Oscillator Frequency Connect a calibrated long wave recei
36. ight Contact spring Tape tightening disc left Spring brake lever left and right Bearing for flutter filter Front panel Knob for operating lever Knob for cueing contro arm Tape guide not adjustable Rear cover plate Spring for cueing contro arm Socket for lamp indicator Index guide for operating lever Adj screw for clutch and brake levers Screw 3 X 10 mm for front cover plate Button for recording left channel Stud for lifting arm Screw japanned 3 x 10 mm for rear cover plate Coil spring for left friction disc Coil spring for clutch and brake levers Screw for feeler arm end stop Arm brake right acetal Bottom cover Thrust disc for flywheel bearing Arm bias head Teak cabinet Mylar slide plate Flutter filter roller Knob for speed selector Contact spring for counter lamp holder Shaft for start stop knob Tape braking arm start stop Shield for indicator 12 5 12 5 12 9 4 2 12 4 12 5 12 16 12 9 12 6 12 10 12 11 12 6 2 7 2 9 12 6 12 9 12 9 2 7 2 9 12 6 2 7 2 8 2 9 2 10 12 6 12 9 2 7 2 9 12 6 12 9 12 11 12 7 12 8 12 10 12 9 12 6 2 5 12 2 12 11 12 4 12 9 124 12 1 12 6 12 1 12 11 12 5 12 1 12 6 12 1 2 5 12 2 2 1 12 2 12 3 12 11 12 8 12 6 12 1 12 11 12 4 12 1 12 6 Part No Description Fig Ret Notes Part 262545 Holder for speed selector arm 26847 spring 26897 2627
37. indexing 9910 264665 Screw for vertical mount 12 1 9910 264786 Upper side plate left 12 1 9910 264830 Rubber foot for vertical mount leg 9910 264865 Terminal plug 7 pin main ampl 9910 board 9910 264866 Spring for tape brake arm 12 6 9910 264909 Post for pressure roller arm spring 9910 264930 Bracket for turntable brake levers 2 6 9910 264973 Reinforcing plate for rear corners 12 10 9910 264996 Function switch 12 9 12 11 9910 265060A Guide arm end stop 12 5 12 6 12 10 9910 265096 Tape guide left 12 10 9910 265146A Rubber snap lock for reel 9910 265735A Transistor cooling fin 12 9 9910 266072 Loose cover plate for rear connect 12 1 991C 266087A Spring for pressure roller 4 2 12 4 991C 266238 Output switch 12 6 12 11 9910 266309 Sleeve for end stop lever 12 10 9910 266439 Lever for instantaneous start stop 991 mechanism 9910 266540 Rear panel European version 12 7 991 266741 Arm for end stop mechanism 2 12 12 10 991 266791 Fork for instantaneous start stop 991 mechanism 12 4 12 6 9911 266827 Guide plate for push buttons 12 6 991 267373 Coil spring for right friction disc 2 1 12 3 991 267416 Spring for inst start stop arm 12 6 12 10 991 267768 Eccentric segment 12 5 991 268062 Spring for pressure pad arm 2 7 2 8 2 9 2 10 12 6 991 268120 Bracket for instantaneous start stop 268221 Rear panel US version 12 8 268422 Spring for end stop arm 12 6 12 10 Part Description Fig Ref Notes 268472 Arm f
38. istors located in same frame indicate equivalent types 15 0 BLOCK DIAGRAM FOR MODEL 3000 MIC INPUT i MiC uNE LEVEL BUFFER RECORD LEVEL PLAYBACK BOOSTER OUTPUT L LINEJHIGH Lo o to EQUAL INDICATOR EQUAL AMP AMP AMP AMP RADI RADIOLOWLO OUTED ps 2 5 OFF 9 2 cam ERASE RECORD HEAD PLAYBACK HEAD HEAD Sa EM o loureur SELECTOR 1 SWITCHES SHOWN UNOPERATED POSITION E RECORD L BUTTON Sa AND Sb RECORD R BUTTON Sc AND Sd BIAS HEAD 3i 3 451 FE PEE SOUND ON SOUND AND ECHO SELECTOR L R PLAYBACK RECORD EQUAL BOOSTER OUTPUT R AMP AMP RADIO OUTPU 16 0 PRINTED WIRING BOARDS AND CIRCUIT DIAGRAMS 16 1 European Version Input and output terminal board Printed side Board for record playback equalizing amplifiers level indicator amplifiers and booster amplifiers Printed side n 1 fat en 2 1 ae e o at gt E JE E 18 T DJ E ET T Ro 5 ver 2 EG B Let KE 1 Ki PF s7 6 L 2 T 2418 HI esse 1 _ 1 d m map 3 Nose 1 Gand I I 2 2 9 md Case 202 Ain k Ks 8283
39. mm 80 mm lever radius radius Pos 1 Winding R 40g 80g 159 30g P Tape tension L p 0 22g 0 8g R gt Pos 3 Fast winding 2400 6700 9080 2500 L lt lt Fig 2 3 After longer periode of continuous operation an increase of the torque by 20 30 is considered as normal ET Ensure that the torque is within the specifications in the table by running the tape recorder in verti cal position and with full 7 reel on take up turntable 991014 10 02 0 047 264930 991017 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 8 brake pad and the turntable is approx 1 mm 0 04 If necessary adjust screw D Set the operating lever to Fast Forward Winding or Fast Reverse Winding position respectively Ensure 0 imm that the clearance between screw C and the bottom 0 004 of the hinged delrin parts on operating arm 991017 1 lays between 0 5 1 mm 0 02 0 047 If necessary Fig 2 4 adjust screw C 991008 260361A 261805A Fig 2 5 The adjustment procedure is equal for both turn tables 251489 A 252754 254844A 6 5 mm 1 4 268062 254025 990325 2 3 Pressure Pad Adjustment Set the operating lever to Neutral position The clearance between the pressure pad 9903
40. on in playback A tape recorded with a 400 Hz signal 8 dB below 0 dB on indicator gives less than 0 8 90 tape distortion in playback get orm WOW CROSSTALK ATTENUATION INPUTS OUTPUTS SIGNAL TAPE NOISE WEIGHTED GERAUSCHSPANNUNG SIGNAL TAPE NOISE UNWEIGHTED FREMDSPANNUNG SIGNAL TAPE NOISE SIGNAL TAPE NOISE WEIGHTED A CURVE R M S DIMENSIONS WEIGHT W R M S 7 2 ips better than 0 07 33 4 ips better than 0 149 17 8 ips better than 0 28 DIN 45511 7 2 ips better than 0 1 33 4 ips better than 0 2 17 ips better than 0 4 At 1000 Hz Mono gt 60 dB Stereo gt 50 dB Each channel has the following inputs 1 Microphone input for dynamic low impedance microphone Impedance 200 700 ohm Sensitivity at 400 Hz 0 1 mV Maximum input level 25 DIN socket US version Telephone jack 2 Line input for high impedance source Impedance 1 Mohm Sensitivity at 400 Hz 100 mV Maximum input level 20 V Phono sockets LINE INPUTS 3 Line input for low impedance source Impedance 57 kohm Sensitivity at 400 Hz 5 mV Maximum input level 1 V DIN socket RADIO Pin 1 left channel Pin 4 right channel US version Phono sockets LOW IN 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
41. or instantaneous start stop 12 1 268975 Front cover plate 12 1 Valid below ser no 2741076 269097 Strap for transfer wire 269112 Rubber foot 269255 Screw for cover bracket 3 X 4 12 1 269449 Bracket PW board 12 9 269772 Walnut cabinet 12 1 269786 Bracket for fastening rear cover pl 12 6 12 7 12 8 12 9 12 10 269801A Shaft for inst start stop lever 12 6 269902 Sound on Sound switch 12 7 12 8 12 9 270469 Shaft for cover interlock Valid above ser no 2733265 270821 Rear bracket for cover interlock 12 10 Valid above ser no 2733265 272050 Stop bracket for pressure roller arm 12 10 272854 Right bracket for cover interlock 12 1 Valid above ser no 2733265 273134 Power switch 12 10 Valid above ser no 2741076 273407 Spring for fork pressure roller arm 12 6 273559 Window for counter 12 1 273939 Return spring for pressure roller arm 12 6 274162 DIN connector for input board 12 7 274183 Spring for cover interlock Valid above ser no 2733265 274535 Left bracket for cover interlock 12 1 Valid above ser no 2733265 277523 Front cover plate 12 1 Valid above ser no 2741076 990204 Parallel arm complete 990213 Holder for transfer wheel 12 6 990233 Transfer wheel 12 6 12 10 990305 Arm for transfer wheel 12 10 990312 Flywheel with capstan 12 6 12 10 990325 Pressure pad 2 7 2 8 2 9 2 10 12 6 990330 Lifting cam disc w shaft 12 10 990334 Pressure roller 4 2 12 4 12 5 990346 Bracket with shaft end stop 12 5
42. r without flickering on side of the pressure wheel Check that height positioning of the guide posts is correct 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 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 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 fig 4 2 until the tape is running evenly 3 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 If necessary adjust pressure roller spring 234478 to make the tape run perfectly 247941 236045 266087A 990334 Fig 4 2 Azimuth adjustment of pressure roller 2 D Fig 4 1 Tape path adjustment screws wee A 9 28 AA Ten leui es aku 9 5 0 HEAD ALIGNMENT WITH TANDBERG TEST TAPES MODEL 3041X 5 1 Playback Head Set the recorder for stereo playback and connect a VTVM to each one of the outputs Output selector to position
43. ver 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 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 that the same voltage 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 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 V by means of R 501 Check the voltage across lower head half and adjust to 22 V by means of R 502 Demagnetize heads and tape path 4 0 4 1 Visual Check Load the recorder with 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 parallel to the record head Operate the start stop knob and check that the tape runs within the rims of the pressure wheel rubbe
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