Ampex-MX-35-Operation-Maintenance-1960.09 电路图 维修手册.pdf

《Ampex-MX-35-Operation-Maintenance-1960.09 电路图 维修手册.pdf》由会员分享，可在线阅读，更多相关《Ampex-MX-35-Operation-Maintenance-1960.09 电路图 维修手册.pdf（27页珍藏版）》请在收音机爱好者资料库上搜索。

1、 AMPEX MODEL. I TM 2012A SEPTEMBER 1960 Allla I -f -=-,= . IA1PEX l :._ . . . . - t-OWU + + 0 - ,c.,-. - ( . :t-:. :.t: t I AIIPJ:., I ;._ . . . . . . . - - , . , . + 0 . cf- - MIXER ASSEMBLY TM 201:ZA SEPTEMBER 1960 . ,c :,.: . .:.a: . ,IPffej :.- . -1-. . , . . . ,. . _.,., + 0 h- . - - , I DESCRI

2、PTION General Performance Charaetcnsucs Equipment Applications INSTALLATION GencTal . . . . . L nstallation of Equipment rnsrn.lla.llon of Plug-In hems Connections . . . , , . 3 OPERATING INSTRUCTIONS Controls . . . . . . Applying Power , . . . SctLing Up the Comro)s Operation of I he Equipment 4 CH

3、ECKOUT AND ADJUSTMENT 5 6 1 2 3 4 5 6 Gcnernl . . . . . . . . . Overall Gain Measurcnlent . , . OveraU Gain Adj1 Sto1Ct1t Frequency Response ! tcasure.mem MAINTENANCE AND TIOUBLESIIOOTTNG General MnintcoaJ1ce lnfonnation Con-cctive Maintenance . Ordering Pares . . , . . Parts LI AUxer Assembly . THE

4、ORY OF OPERATION M.icrophorte Preamplifiers Output Amplifiers . , . . Mixer Coupling . . . . . 1 M,1;.; Ampex MX-35 Mixer Assernbly . . , , Typical Uses of he MX-35 MLxe, . . . MX-35 lvUxer Assembly - ; View . . JlJlck Layou, (Shown wilh Ampex 354 Tape Rocorler) Mounting Otmonstons . . , . . lmcrcon

5、nccting Two or More Mixers . Operating Controls , , . . . . . . Response and Gain MCllsuremem Se,-Up Troubleshood.Jlg the Mixer . , Parts Location, ifX.35 Mjxer . Block Diagram. MX-35 MlJcr . . . . . . . Partial Schematic Diagram, Microphone PreampUJicr Partial Schematic Diagram, Output Ampliller .

6、. . SchomaLic Dia.,-am, MX-35 Mixer . . . . . . ill f01Q J. I 1-2 1-3 2-1 2.1 2-2 2-2 3-1 3-2 3-2 3-3 4-1 41 42 4-2 5-1 5-1 5-2 5-3 6-l 6-2 6-2 6-3 Iv 1-3 2-2 2-2 2-2 2-3 3-2 4-2. 5-2 6-2 6-2 6-2 11- tl . -, - j GENERAL TI1c Ampex l1X,35 1ier Assembly pro v1des complete mixing facU1c ies. Sb: inputs

7、 and two outpotS are provided. The Jnpurs con. sist of four microphone jnputs ond two U ne inputs. Swicching allows any combint1don of up LO four Inputs to be connected to either or both o1 tputs. Provis1QnS nre aJso made ror coupling up to four mixer assemblle$ together. Tbe inixcr assembly consist

8、s or a singe chassis on wbld1 Is mounted four separate and complecely indeJ)endent mlcrophone pre- ampUficrs and two separate- ourput amplifiers. Swhch1.l1g aJJows any Jn1cropbo,1e preampli6er t() be connected to either or both of the output amplifiers. AddhJcmaJ !.witching ls provided to bypass two

9、 of the microphone prerunpllfiers (separately) so that nvo line lnptns can be connected to either or both ourputs lndhid ual ga.tn comrols are provided as Is a maswr galn corurol. On 1he back par1cl of the mlxe:r assembly are ;i.)J connecting and int:crconnec1lng prov(. sions for line and microphone

10、 inputs. line outputs-, power a11d mixer coupling. A screw- t.ype fuse posl is ab;o provided on the chassJs back JlIDel. 1-1 SECTION 1 DESCRIPTION f Inputs: ln1ntl lmpcdance: Output: Frequency Response: Noi.sc: Crosstalk Rejection: Controls: Connectors: Pouter f upul: Tubes, Di.rriensiotts: AUe$sQri

11、es: PERFORMANCE CHARACTERISTICS Four low level mJcrophone inputs and two bjgh level Une inputs. any coinbln.atlon of four being available aL any one dme; incorporating high level mllng. Microphone; 200 ohm non-Lc.rm1natlng: Line: 1 OOK ohms w1bn.laJ)ted bridging (20K ohtn balanct:d line wilh Qpr.ion

12、al plug-in Ltallsformcr). Two I volt nonnal output level: 30 101ts maximum output level wl1en fed t.o a bridging input with an Input Impedance of at least JOOK ohms. Coble capacity should not exceed 0.001 microfarad 10 preserve high frequency respot1sc. Sufficient to produce 1 1 volt output wilh an

13、illput sit,rnal of -65 dbm on any microphone channel and -20 dbm OJ any line channel for maximum controJ settings. :,: !db 40 ,o 15,000 cycles per seoond. 65 db below signaJ for inputs of -55 dbm. This rcpresenu; a noise cquiva1em co an input signaJ or -120 dbm. Microphone Preamplifier: (distortion

14、ch:i.rnctcristics as a func:tion of Input level) 30 cycles- Less than 0.2% at -52 dbm input Jovel Less thon 0.4% a1 - 42 dbm Input level Less 1han 1.0% at -32 dbm inpuL level 500 to 15.000 cycles - 1.sR than O. l % at -5.3 dbm Input level Less than 0.3% autput level 500to 15,000 cycles- Less lhan 0.

15、3% a, 25 volt output level 65 db at 500 cycles, 50 db at lOKC. Four AUen-Btad.Jey poter)dometc:rs ( calibrated step type avaJlable on special order); mast.er gaJn (two gang) potentiometer; key sw1tches for selectiOn of mlc:rophooe or Une on two Input posmons; key switches for channel A. both or chan

16、nel Bon each mixer Position; ac line swicch: mixer coupling switch (located on the back of the chassis), cannon . XL . type on all inpuL and outputs except for a terminal strip used for mbccr coupling. IOS.125 vol!S, 50-60 cycles, 30 wans. Six EF86/626Ts and one 12AU7. 5. 7 ;:n H, 19 L, and 5 -3/16

17、D (for 5 . 1/ 4 rack space or poTlable ea,;c). Plug-in 20)( ohm b:ilnced bndge line Input trllllsfonner (Catnlog No. 96134-01 ). J-2 EQUIPMENT APPLICATIONS The MX-35 Mixer Assembly is 11 compact. flexible speech input. sys-tem tha1 h.ts mimer ous applications in the tnpe recording rmd c;ound reinfor

18、cing netds. In the tape recording field. when used w:ILh a proressionaJ quality recorder ,;ch as Lhe Ampex Model 354 or 351. applications include: the recording of live pr1r gr.tm material. both stereophonic and mono- phonic; and the dubbing of live program ma 1 er13I Oer prevfously recorded materia

19、l, both st(lC()phonic and monophonic. In Lhc sound reinforcing field. lhe mixer a!;l:etnbly can be used to advantage in plant paging systems .ind in public address or sound reinforcing un CIIIIII -, ? . 01( I I I II= - I I 0 0 0 0 0 t1N0011UI 1(110.:.0Cll = - u, I I I II= - at 0 0 0 0 0 e.,_o,.,t 11

20、U111m,6 11,11 . . ,. . . o lICI I I I I i = 0 0 0 . e.oo . ,c . , ICOHl . ,G jl)IIHl1oG1 u . 0111o Ot!lO . . !UHi 10 U ( Oo-:11 tf !IO,lf c;. 11Ulj Kl -.01110 . ,111 (II I jl:llr 10 . UCC.:.o ! r It 10 t!CW 10 uco,111 ollt o ,011:a.o . 11 , ! UHOO I c.,. H tl,ff IIICOI-. phones 10 the mLxer and, usi

21、ng I.be channel selector switches. feed the left microphone to Cb. A, the center . and solo . microphones to both channels, and the -nght . mierophorn: 10 Ch. B. fior dubbing Lhe stereo program maw.rial over a previously rccord(.-d stc(C() program, one basic set,up is to connect two microphones to m

22、icrophone inputs 1 and 2 of lhe mixer and lhe oulpULS of a sL ereo tape ttp:roducer to Jirle lnpuS l and 2. Us1ng the channel selector switches. feed the eft mjcropl1one and the left line to Ch. A ond feed the right micro- phone ond the right . line c o Ch. B. The basic set-up for monophonic record-

23、 ing of a Jive program is similar to the set-up described for stereo. the basic differenoc being 1.ha.l au ndcropbones a:re fed to Ch. A only ( or to bth channels when rnaklng a second s.i mul1oneous pCOl(X:lon rocordlng). All of Lb above applications have consld- ercd only or,e Jnixct assemb1) and

24、only one or two channel operaLJ(m. SLilJ considering one or two channe) o per.i.tion. two or tnOlC mixer assemblies (up to four) can be coupled to- gether 1.0 ptovide additional inputs. Further. two or more mixer a,s.-,e,mbUes can be stacked 10gelher (wi1hou1 coupling) to pro,1de addi- 1.tonal chann

25、els (up to four channels can be provided with ooJ) two mixer assemblies) . Finally, m1.xer assemblies can be both coupled and st3cked 1n almost any combination d - - .,.rj,ii Ruck layom (shoum with Ampex 354 Jape re corder) ., o, Mounting dlmt.,s,ous 2-2 1 o I I/ 1,7 0 , . I I ,., JO AC t :lD I ,ooo

26、 I I,., o , .,. do I ii99 I mo CII - lnt-erccm1ectiug two or more mb:trs Muroc. Conoecl tbe OUTput connectors, J9P asscmbJy comrols overall gain while. all other and JlOP, of Lhe mixer to t11e inpuL conneclOrS master gait.- controls become inopcrutive. c,f the equipmcnl ,.; th which Lhr; mixer assem

27、 bl) Is 10 be usod. If more than tour inputs arc required, ad dltional mixers must be used. In this case, the coupled mLxcr tennlnal strip TSJ (pins 4, 5 and 6) of the first mixer shou1d be connected to the coupled mixer (eTITiinal .strtp TSJ (pins I. 2 and 3) of the second mixer and lhc CQ1Jpled mi

28、xer tennfnal strip TSI (p1ns 4. 5 :md 6) of the 1wc.ER NOH MAL position. When two or rnorc rnixers are coupled together in thl.s manner, 1hc,:re arc stiU only hro outputs and the . master gnin comrol on the a.-.t mlxc.r 2-3 Lf rnore Lhan two outputs arc rcqulrcc.l (i.e , 3 channel operatlon). additi

29、onal mSxts are also requited. In this case. howeer, 1he mhcrs arc u()t coupled together as previously de- scribed, but rathe:r. each mixer Is c:01l!lected :ls described for single mixer operation. Connect Lhc inputs (lines and or micro- phones) to the 1 nixer(s) ns dcs1rcd, NOTE The llfX-35 Mixer A.

30、scmbly i$ peci- fically designed for use with l11t Arn pex Mod,t/ 354 Tap Recorder/ lleprr dur. Use of tl,c mixf!T Is., ho-:.tfVr. not Umiied lo this tape recm-dt:r. The mixer may be use.d wUh any elec- trouics equ.fpntcnl ,hat has an mput fmpedance of at Jenst 100,000 ohmR ,md rf!qulres 1 t.-olt rm

31、.s inpul or less for proper OperaHfm. Cable capacily hould not exceed IOOOp.,J./ to pre. ,n,e ltlglt frequency re.ponsr. SECTION 3 OPERATING INSTRUCTIONS CONTI!OLS 01 the rront panel of the mixt!r assCJnbly arc racllldes fol setting the levels of the lndl ,1dual inputs and the combined outputs. Srll

32、ching allo,vs each Input lO be fed to either or both outputs and addiliona.1 swilching aJJows Lhe selection of either mike or lino lnpul in the No. 3 and No. I.J mi.xer posilion. All switching regardJcss of combination ,nalntains proper balance and isolation between channc1s. The following rnble des

33、cribes the fw1ction of ach ope.rating control. All controls Hstcd are on 1he front :pand of t.hc miCer tmfes!i otherwise noted. 3-1 JI Item POVER ON-OFF SVITCli UCROPHONE-LINE SWITCH CH.A-CH. B SELECTOR SWITCH MIXER LF.VEL A ,: Symbol S8 SJ S2 S3 S4 S5 S6 R5 RIO Rl5 R21 R53 57 (rear panel) J32 (Chas

34、 R36 is) -+ - - . . . . . + . 0 Operating courrols Fuuttum ComroJs power Lo the mixer assembly. Indies.Lor lamp OSI Is UL when power io ON. Used to select 1licrophone 3 or LINE l (switch 51) and M1crophone 4 or LINE 2 (switch S2). When In the center (OFF position. no output is obtained from tlmt mix

35、er position. Used to focd tho Input to either or both of lJle outputs. . Adjusts the Jcvcl of I be individual inputs. Adjusts Lhe le1,e.J of the combined inpms. Allows two or more mLxer assemblies w be coupled lO- getber. Adjusts tl1c ovcroU gain and balance of the mixer assembly, SITTING UP THE CON

36、TROLS Power is supplied through POVER switch S8 which nttL-L be turned on to operate the mixer ass:mbly. If ,.nore Lh:in oae mixer as- sembly is used. tht POWER switch on each mixer musL be lumcd on. The ml.cr assembly is fused by Lhe ampere fuse FL NOTE Ta avoid overloading tile Ui.lt$ equip ment,

37、tlrf! gain c-mu.rols should ALL bt turuerl to O (maxmmm cow1ter dockwi$e rotation) before starttug lhe folluwin, q procedure. 3-2 Sc1 the gain controls on the associated equipment lo approximate:lv 3 oclock. Su the chonnel selector and MICROPMONE-LINE SC lector switchtS on the mixer as desired. Set

38、the A s used. th.e input and/or output levels shown on the test set-up illus tratlon will have to be modified ac- cordl.tigl.y. Step l r Connect the audio oscilJator and the vcvm as shown in the ,esl set-up. Set che oscillator aL 500 cps. St,:p 2: Set all front pane) level co-ntrols at maximum. Step

39、 3, Set the oocillator output level at l ,olt rms for the microphone inpm or 0.25 volt JlllS for the lioe input. Output of tho mixer assembly should be I ,oil rms as read on che vtvm. See note above,) OVERALL GAIN ADJUSTMENT To set the overaU gain or the mixer assem bly to the nomJnal value (or any

40、other value 4-2 within JO db of d,e nominal), use tbe foDow- ing procedure . Step 1: Connect the audio osciUator and the vcvm as shown in c.h test set-up. Set tho oscntator at 500 cps. Step 2, Set 11 front panel leel oono-ols a, ma).imum. Siep 3: Set the oscillator output leel at 1 volt rms for the

41、microphone input or 0.25 volt rms for the llne input. (See NOTE in the GA IN MEASUREMENT para- graph,) St.ep 4, Adjust the LEVEL SET control to pro- duce a 1 Oh rms output as read on 1hc vtvm. (Sec NOTE In !be GAIN MEASUREMElT paragraph.) fREOUENCY RESPONSE MEASUREMENT Step I: ConnecL the audio oscf

42、llator and the vtvm as sh.own in the test se.t-up. Set the oscillator aL 500 cps. Step 2: Set all front panel level controls at m.utlm um. Step 3: Set the osciUator output level at 1 volt rms for the microphone input or 0.25 volt rms for tlte line .inpUl ( or 10 the value used jn setting the gain In

43、 the GAIN .DJUSTMENT paragraph). Step 4, Make a frequency response check by using at least ten discrete f-requencies bance.n 30 and 15,000 cps. The out- pt1t lcvrd of 1hc mixer a.ss-cmbly should not vary more than pJus or minus one db from tho 1 1ormal output. SECTION 5 MAINTENANCE AND TROUBLESHOOTI

44、NG GENERAL MAINTENANCE INFORMATION Careful pcdodic performance checks will casure exccllc.nl t.-qujpmem operation. Vhen t11c S)Slem is set up according to the insttuc- Lloos in this manual, quipmenl pe1 formancc should meet lhe high Ampe.x standards. CORRECTIVE MAINTENANCE The first step in any corr

45、ective mainten nnce procedure is Jocaljzing the faulty circuit. A nm through of the alignment find perform ance checks or the mixer assembly will help lsolatc the trouble-and the rauJt) component then should be easily idcntili.,ble. 1 circuit for trouble -.hooting the mixer nftcr 1 he pc.rfonn ancc

46、checks hnvtt been made ( especi:illy use- 6-1 I ful If tho trouble has not been isoltcd) Is shown bclow sec also- PARTS LOCATION- MIXER ASSEMBLY, and SCHEMATIC DL- GRAM-OXJ:R ASSF;IBLY). TroublesllooHng tile! mh er Disconnect any input or ou1pu1 when using lhJs circuit Using a lvm probe and working

47、back from the output toward the input, check at the grid and plate of each stage unct) a sjg. n11I is indicated on the vtvm. The trouble c.hc.n is probably in the. Slage lmmediately following 1.hat poim Wbetl the fa1Jlty stage ls located, the individual cornponcnts can Ix! isolmcd by a check of resi

48、stance and ,oltagt!s. Typical volt age reading.i; are shown on the foldout sche- matic dlagmm; voltages mc3SU.red wlU vary wil.h Une voltage, Lhc voltages indicated on the schc1natic diogram were mr;asured whh a I 17 volt line voltage. ORDERING PARTS The purpose of Lhc parts Jist is co aid the ust.tr in ordering replacement parts. Ampex 6-2 can offer fast and efficient service in pro1id- ing normaJly replace.able partS or Lhe compo- ncms ln the syslcm when