Tandberg 3400 X 3500 X 3600 XD Service Manual

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CONTENTS l. l.l r.2 , 2.199 3. 3.1 3.2 3.3 3.4 c.c 3.6 4. 4.1 4.2 4.3 4.4 4.5 5. 5.1 5.2 5.3 5.4 c.5 6. 6.1 6.2 6.3 6.4 6.5 7. 7.119 7.3 8. 8.1 8.2 8.3 8.4 9. 9.1 9.2 10. 11. 11.1 rt.2 11.3 Page Introduction.... ..,....3 General ....3 Removingthe toppanel . ......3 Maintenance.... ...,.,.4 Cleaningthetapepath.. .......4 Lubrication .......4 Mechanicalchecksandadjustments.. .......5 Checking the take-up force and winding force. . . . . . 5 Adjustingthetake-upforce. ....5 Adjustingthe windingforce. ...6 Adjustingthebrakes .....8 Rubberdrivebelt .......8 Pressurepadarm ...9 Tapepath ...10 Capstan .....10 Headparallelism. .......10 Tape guide posts and guide screws. .. .. .. . . .11 Pinchroller .......11 Flutterroller. .....12 Head alignment with Tandberg test tapes, four tracks . . . . .13 Playbackhead. ....13 Recordhead. .....13 Height adjustmentby trackmeasurement... ......13 Biashead ....I4 Erasehead ...I4 Head alignment without Tandberg test tapes, four tracks . . . . . . .15 Playbackhead. ....15 Recordhead. .....15 Biashead ....15 Erasehead. .......15 Aligning the hum shield for the playback head . . . . .15 Headalignment,two tracks .....16 Playbackhead. ...16 Recordhead. .....16 Erasehead ........17 Circuits .....77 Oscillator. . . .I7 Photoend-stop ........I7 Record and playback frequency responses . . .18 Faultinthetotalresponse curve,one channel..... ......19 Modifications... .......20 Changingthelinevoltageand frequency... .......20 Changing from four tracks to two tracks version . . . .20 Blockdiagrams ....20 Electricaladjustments.... .....22 Outputamplifiers (3400X) .....22 Dolby*leveladjustments (3600XD). .......22 Adjustments,allmodels.... ...23 Circuitdiagrams .... from page24 * The word Dolby is a Trade Mark of Dolby Laboratories Inc., USA -----.....- - t a

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1. INTRODUCTION - 1.1 GENERAL Only LH (Low Noise/High Output) tape should be used for recording. Make sure that the heads and tape path are clean. To check the heads: - l. Remove the front head cover by depressing the spring loaded buttons at both ends and lifting the cover straight upwards. 2. Remove the back cover by depressing the spring on its rear side and lifting straight upwards. When electrical adjustments are to be made, the bottom panel must be removed. The tape path must be degaussed both before and after adjustment. Do not switch off the degausser until it is about 3 feet from the tape path. To make magnetized parts of the tape visible, dip the tape in "Magna See". This is a mixture of iron oxide powder and alcohol. Iron oxide powder can be obtained from our service department. A NOTE! All paragraphs in this manual are valid for: Model 3400X, from serial No. 4300 000 Model 3500X, all decks Model 3600XD, from serial No. 4200 000 1.2 REMOVING THE TOP PANEL Remove the head covers and the speed selector knob. Then remove the screws as shown in Figure 1.1. Removal of the top panel will usually only be necessary for checking and adjustment of clutches and other parts in the drive mechanism. Fi4.1.1. Top panel screu)s .HHs..[n -