TANDBERG 3400X, Service Manual

Page 1: ...IffiEffi SERVICE MANUAL SoooxD...

Page 2: ...rgtest tapes four tracks 13 Playbackhead 13 Recordhead 13 Heightadjustmentbytrackmeasurement 13 Biashead I4 Erasehead I4 Head alignment without Tandbergtest tapes four tracks 15 Playbackhead 15 Record...

Page 3: ...adjustment Do not switch off the degausser until it is about 3 feet from the tape path To make magnetizedparts of the tape visible dip the tape in Magna See This is a mixture of iron oxide powder and...

Page 4: ...ith the cleaningagentand then removedwith the aid of a toothpick The pinch roller A shouldbe cleanedif the tape runs unevenly or if there arevisible depositson the roller 4 to 6 times a year shouldbe...

Page 5: ...FORCE Fig 3 3 Adjusting the take upforce NOTE Do not touche the textile sideof the belt with your fingers The rubber drive belt doesnot move during normal forward drive This is becausea textile belt...

Page 6: ...th the joystick in the FREE position the play on the turntableshouldbe between0 5 and 1 mm asshownin Figure3 4 The play on the left turn tablecanbe adjustedby turning the nut on the turntable spindle...

Page 7: ...ght and left shouldbe between0 5 and 1 mm To adjustthis play turn the screwsB shownin Figure3 6 Whenthe play on the turntable and the clutch levershasbeenadjusted the winding forceswill be correct Che...

Page 8: ...the clearance 3 5 RUBBER DRIVEBELT The rubber drive belt does not move in PLAY mode This is becausea textile belt provides the take up force via a drive rvheel mounted behind the take up turntable Whe...

Page 9: ...RM With the joystick in the position the tension from the pressure pad arm againstthe bracket shouldbe between80 and 100 g This pressure shouldbe measured asshownin Figure3 11 Adjust by bendingspringA...

Page 10: ...f the tool rest on the plate Tighten up the screws and check again that the legs are all touching the Plate NOTE The capstan will not go out of adjustment with normal use and transit 4 2 HEADPARALLELI...

Page 11: ...edgesof the guide posts and guide screws but under no circumstancesshould it twist or distort The two adjustments possible on the pinch roller are parallelism and azimuth Parallelism Push the pressur...

Page 12: ...apeguide post Move the screwdriver to the position shown in Figure 4 7 and move the flutter roller carefully to the right If the roller is correctly adjusted the tape will lift slowly upwards from the...

Page 13: ...m output on the voltmeters is obtained on both channels or adjust for the best compromise 5 2 RECORD HEAD Height adjustment by visual inspection Insert a new tape and set the deck to normal forward dr...

Page 14: ...Insert a screwdriver in the groove shown in Figure 5 2 and tilt the bias head to the right Then tilt the bias head carefully by means of the screw driver towards the left until the induced voltage bi...

Page 15: ...f the ferrite core for the upper track of the erasehead should be visible above the tape see Figure 6 2 Upper edge of tape coincideswith upper edgeof upper pole piece Fi7 6 1 Fourtrackplayback head 6...

Page 16: ...ht of the record the screwsC Figure 10 1 head by n reans of Record on channel L a 1 000 Hz signal at 7Yzips well above normal recording level first in one direction then in the opposite direction Cut...

Page 17: ...or channel R 8 1 2 Bias current pre adjustment Preparethe machine for a stereo recording ancl use a VVX to measure the voltage acrossih r pp half of the bias head Adjust the voltase to 22 y by meansof...

Page 18: ...the VVN 0 dB Sweep the audio oscillator over the frequency range and check that the readings on the VVN correspond to the curves shown in Figure 8 4 8 3 2 Playback amplifier Connect a22 ohn resistori...

Page 19: ...he LINE input and apply the f requencies shown in Figure8 4 Check that both the meters on the machinefollow the curve in Figure8 4 Fault in the record head or the bias head Changeover the wiring on th...

Page 20: ...e following parts must be changed when a four track version is modified to a trvo track version and when new heads are fitted The value of the total capacitance is labelled on the heads Part Four trac...

Page 21: ...0 t r BLOCKDIAGRAMTB 35OOX BLOCKDIAGRAMTB 36OOXD...

Page 22: ...1 Theheadadiustments screws Too low Fig 10 2 Trackmeasurement four track recordhead Too low Fig 10 3 Trach measurentent four trach eraseheurl Too low Correct Correct Too high Fig 10 4 Track measuremen...

Page 23: ...d by altering the value of the resistorsRB00 R900 or R801 R901 If theseresistorshave to be altered drastically it is an indication of some other kind of fault in the amplifier Checking the Distortion...

Page 24: ...s to SOURCFI Connect an audio sig generatorat 1000 Hz to the LINE INPUT socket Connect a WtrI to points 603 L and 610 R on the Dolby board and adjust thc INPU I t EVl L controls to obtain 50 mV Connec...

Page 25: ...ck 4 Playback 25 Playback I 1 Playback Record Measuring instrument Voltmete rs Voltmeters Voltme ters Voltmcters Frequency counter Voltmeter Test Iape No 2 Conect Dolby reading Speed switch See 77rips...

Page 26: ...level does not deviate more than J 2 dB from the re eranceleve over the following frequency ranges 7b ps 30 22 00O112 33 rips 40 18 000 IJz I 7 8 ips 10 9 000 Ilz 3600xD When you switch thc Dolbl knob...

Page 27: ...i Hm Hffi fl cls t tff 6 er s er t rgrrsh sJrr 106 108 206 to 6 6r I I H THEMAINBOAR SERIALNO 43O All theboards ares I l l q6d ecto r RII l H I XF tffi rr q i F tE N al JRSI5 l Eq o tf Eo Y b zl 9 T2...

Page 28: ...lffffi XT Iffi K T ori l l r I uil ul It slffilfil eBr rr t t 1lffi Eo T r f S Gl Elt i t H i H q FSffi ffiU I i i 3 Lru Bl u ffiffiHffiE fl ffiff F lYl ODEL34OOX FROM i qf I bl uli lo rlr l1I Ll lfl...

Page 29: ...l l NU_ I LEVEL L I a a5 c EIASE HEAD L o RIGHI CHANNEL I l L FNt l00l 201 D i i J df Ed t I I t _ ILL necl a fR Ed I vrr l A AS AOJ R fRaa __l L Ecr RI I J REC ADJ R cl04 2 0r lm 8lA5 A0l L fo l I t...

Page 30: ...l ac 1078 I t H E ZED REC AMP LEVEL INOICAIf R tl REC HEAO L c METER z PL AIEACK TOS ON5 iiitri L qEAoL swlcH DC VOLTAGE REGULATOR gr rL r PHoToELEcTRIc ENosTr P I I l l l 1 68p I c sor F 0 1 I tHr ff...

Page 31: ...E uRKtNo LLlij_l REAR PANEL uMNo R AOJ msEr coNtrcL O is rEsrrcrNT o1O CONNECTTON TERI ML L UPER TRAq LEFT CHANNEL R LOWERTRACX R GHT CHANNET oPACITORS INDICAIEOtN pF UNLES OIHERW SE SCIFIEO 1 0 OOOFF...

Page 32: ...t ol ffi ffiffi ruH It dF THEMAINBOARD MODEL36OOXD FROM SERIALNO 42OOOOO AND MODEL35OOX TO SERtALNO 4009900 H s ss GO r r OS w ffiog i Ha t F4vE Sry ftlo qFs1ru r 13 I le s I 1St 6H 3 Jf grilL ta aJ r...

Page 33: ...I t I 1 I ENcoDE PRocEssoR U 601 DOLBYCIR...

Page 34: ...1 I t fR DEcoDE PRocESsoRU 801 I f rq r1 NE54s I f E oEcooE PRocEssoR ugol Fq r1r NEs45 t ENCOOE PROCESSOR u 701 NE 545 PIN CONFIGURATION ON NE 545 TOP VIEW 169 tl t t4 OOLBY N R SWITCH _ 1 3 OeT c7n...

Page 35: ...IN AMP ii o REC HEAOL OSCILLATOR aot75 c96 85 5kH MEIER LLUMR ro E0uA zalr0N I lm EOUALIZED REC AMP I SELECTL I ar2rl a r 0 03 BCl4 d tJ l iOOLBY A IYPE INIEGRAIEOC RCU T ENCOOE ROCESSOR N0 62209 l fN...

Page 36: ...I 14 B trF rrli TOS0NS L r l 1 r l t36 I I zSV IO DOLAY NR SW ICH I I I re I Dc VoLTAGF RLGTJI AroR li J F_ ___ l 1 r r c2 o llt_ ll L OOLBY S YPE NTE6RAT OC RCUII oEc0o PFocEss0R NO 62209 i _l r cl5l...

Page 37: ...arl iEAR PANEL MIR NO ONNE I ON IEEMINAL P E TRACXTLEFI CHANNFL lwE IRACx RrcHt CaANN l H Y API IORS NOCAT O N PF E5S OIHERWS EC F DE raoa oaaoF RFSS RS NDiAT O OHMS JNLE55 OTHERWSI 5PFC F ED r raot o...

Page 38: ...fi 3 s 6s r THEMAINBOARD MODEL35OOX FROM SERIALNO 4OO99OO SERIALNO BELOW SEEPAGE26 I r oi ouo oao g F O r r O t eg_ a_P I r I ffi giErt os rltti I9i zu ptao l r D i tz G IMI BEo a FY t r tn srr fH o N...

Page 39: ...fi at I ffiffi q ttt ps bEHr Tr b N lll q ffiE E I s ffipffii m L H r rrSr T Et 3tflfl Flr fltrff s H 156 tlr 9 _ Xll td ldzrs t BB _ t _l i s FEg TtTuTuTffi flffitrflffi tr flff fl IEMAINBOARD MODEL3...

Page 40: ...f tr MIC LINE AMP EOUALIZ O REC AMP LEVEL INO AMP 1 aa ndll l li nvvffi i l l L ______ l I I IE U le lrcr T0 E0uAlrzaltoN l3 5Vl sroP I l5TtvB I 050 i BC r 3A r _T__ sr8 517 I 0...

Page 41: ...q LEFT CHANNEL LOWEF TRACX ilql Cu Et BOOSTER TOLINEOUI NOIES 16iEsal THrrLl o 3 CAPACTToRS NorCAT ON pF UNLE OrH RwrSE WC F O l 0 ooof RE9STOS NOICAIEO N OHMSUNL sS OIH RWI 6 sPECrFr k r000 vs M rm m...

Page 42: ...a TANDBERGS RADIOFABRIKK A S N 1301Sandvika Norway t 1401 2 77 PartNo 714012 Printed in Norwayby Reclamo A S...