Telequipment S61 B PAG E 1 O F 1 6

3.0

3.1

SECTION 3 CIRCUIT DESCRIPTION

ATTENUATOR AND VERTICAL INPUT AMPLIFIER Fig"".'" 110 'B.

CHl and CH2 Ire icHMiC.t1 and th, fellowing dHeription COViN both ehannal •.

Th, input to th, anenultor is COr'lnected vie C90' to the input .ocklt 51<901 on AC, directly to the input loeket on DC or to IIround on GNO. The C.tpaciW com­pen�1d anenUltor II sWitched by 5902 w,f,r , in nepi of '00, '0 end 1 end the Output il fed to the g,t, oi TR601 vii C60' and RS02 which. toge1her with 0601, protect the input epin" overloe<1! up to ±400 V. TR601 i'l f . E _T. louree fOllower whose output DC 111111 is adjusted to zero by R604 and R608. The Output il th.n anenualed in atlPS of 5.2 .nd 1 .. I acted by 5902 wef.r :2 F Ind fed to the be!e of TR603 which toseth., with TR604 forms' lon;tailed peir. Tha diodes 0602 and 0603 in the eminers increal' the aign'l hlndling Cllpecity without affecting the chan., in gain which remains directly proportional to eurrent end. therefore. to supply voltlOl- Thi, compensetes for the CRT I,nsitivity which i, inversely proportional to supply volta •• end hence the ov,rall v..-tical IInlitivity remains independent of supply votUQ8_ VertlCIII ,hilt i, fed to the bue of TR60<4. The

gain of the chennel is set up by RS13 whi� controls the tot,1 stege eminer current. The collector currents 01 TR603 Ind TRS� pelS through th,rm, I c:ompensating network, RE1'. C602 Ind R614. CE03 .nd ,110 throulJh grounded base SI'Oe TR602 to the output nlglS. TR602 isolatll the eh.nne! switching w.Viform, from the input circuit.

VERTICAL OUTPUT AMPLIFIER Figur.2 The COilKlor currenu 01 the selected chlnnel pllS$ through diodes 0637 .nd 0638 for Ch.nn.1 1. or 0642 .nd 0643 tor Ch,nnel 2, to the blses of shunt feedbec:k stBII" TR633 and TR6l6. The output of TR633 and TR636 .re fed to the blill of TR634 and TA636 •• 10nlJllliled pair whose collectors feed the Y plates of th' CRT. C64' and AS71 in the emitter circuit are adjusted for the best pulse re.t>0nse .nd TH631 compensates for the temperature coeffieient of the input st'lies. The Ipproprilt. channel is seltc:ted either manually by 5631 Ind 5632 which are IIIInged to the vertiCIl shift controls. or autometicelly by tke Chop/Alt,rnate circu it TRS31 and TA632. On EXT X .nd Time/Oiv speeds of 2 ms/div and slower. TR631 and TR632 operate " 8 free-running multivibrator at a freQuency of .pprOIl. 100 kHz. When TR632 conducts D635 and 0636 eonduct end turn off OE37 .nd 0638 thul dilconnectinlJ Chennel 1. Conversely when TR63, conducts 0639 and 0641 conduct and turn off 0642 .nd 0643 thul di,eonnecting Chennel 2. C632 and C634 feed PUIIlI to the unblInking amplifier to blink out the true during tht trln,ilionl. On Time/Dill speeds above 2 ms/div. TRE31 Ind TR632 operate 8' • bistable wh058 ltate i. chenged 11 the end oi eech time �se sweep by an edge from the ,mitter of TR34. The network LS31. C640. RS.O in CHl and l632. C649. R669 in CH2 dellY the 'ranaitions until the trace il bl.nked. Tl'le 1I'�ical output amplifier current supplies the +13 V linl which is decoupled by C645 Ind ,Iso th' +7.5 V line which il stabilized by zener diode D644. The +7.5 V js usld as I refer.nce for th' -7.5 V line which is • shunt stabilizer circuit consisting of TR637. Fl669. R666. R667 and R668. R658 eomplnsat" for vari.tions in the -13 V line and reduc:n th' effect of supply voltage variations on the

-7.6 V linl_

3.2

3.3.

3.3.1

TRIGGER CIRCUIT Fitu, .. 38t4

TIlil consins of • longt.lled plir TR23 .nd TR:25 similar to thl V,nicel Amplifier input stage but with temper.turl! compenation in its emitter cireuit. On the CK2 position the input is connlCted to CH2 end EXT X POtition vii 020. C21, .nd R23 to the TRIG/EXT X sock't. On ,II other positions of the Time/DiY switch the input is conn.cted to 520 which .. 1.Ctt ,ither the EXT TFlIG socket. CH1 or CH2 signal. The output from the eopro­pri'le collector. selected either by the POlarity switch $21 or the Time/Div switch S1, is connected via diode 027 or 031 to tha emitter of common be" stlge TR26. The collector of TR26 is connectBd via 054. 033 lind 034 to tha input of the Korizontll Amplifi,r on CH2 and ExT X positions of tile Time/Div switch S1. On other positions of the Time/D',v switCh the collector of TR26 is AC coupled via 032 to tht bile of TR2 1. I shunt feedbllck stage.

On the AC poSition of S22 the output of TR21 il con­nected via diodel 058 .nd 059, which limit the voltage awing. to the input of the Schmitt trigger circuit TR2:2

and TR24. Th, L.v,1 control R21 allows the mean DC level of the output of TA2l to be varied '0 thet any por­tion of the trillller signal Cln be set at the triggerinllievel oi the 5c:hmitt. When the Level control is in the Auto poSition the r.nge of the Level control i$ restriC:led by the Iddition of R20 in seriH with R22. This reduclls the l,vel control rang' from more than 10 divisions to IPprolli­rretely 2.6 divisions. On the TV position of S22 the output of TR21 is connected via diode 057 to the sync Slperltor TR38 which conduct. only during the sync pulses .nd is cut off during th� video signal. On Time/Oiv speeds of 100 I.A .nd slower the output of TR23 is inte­gratlld by Rl29 ,nd C6l. This gives, wlveform where the field pul .. s ere of greeter amplitude than the line pulles and ,re fed Ilia TA25 to the input of the Schmitt trigger circuit. On Time/Div speeds of 60 J.I$ and laster e63 il dilconneCted from ground by cutting off diode 066. The Ii!'lt end field pulses Ire then of equ.1 .mplitude and .,e fed vii TR39 to the input of the Schmitt trillller circuit. On TV diodes 068 end D6SI er. cut off and the Ltllet control is disconnected by switching R22 to -13V. The Schmitt trigger circuit TA22 and TR24 providl!$ , con· stand .mplltude trigger signal at the collector of TR24 to the timab .... nd bright-line .uto circuit.

TR30 provides a positive going gating pulse to the beit of TR24 to inhibit the Scllmiu trigger circuit during the timlb ... sweep. Thi$ prevents trigger pulses being pro­duced during the sw.ep and breeking through into the Venicel Amplifier. To prevent the triggering pulses which art produced by the gating w.veform being f,d to the bright-line AUTO circuit a negative differenti.tecl pulse il fed from the collector of TR30 to the anode of 043 cutti", It off briore the arrivil of the pOSitive trigger

pul ... Th, trillller puis. is thut prevented from reaching th,e bright·line circuit, criggering it and interuptinll the

fr" running of the timebase. The gating is removed on timlbase speedS below , msldiv by removing the HT supply to TR30 by melns of 51 - 2F.

TIMEBASE, UNBLANKING AND BRIGHT LINE AUTO CIRCUIT Figure 4

Th. differentilted positive pulll from the trigller circuit

Is fed vii D36 to the ba .. of TA27 which toglth.r wilh

TA21 forms I bistable_ The pOSitive pulse turns on TR2' which in turn cuts off the clamping transistor TR34. Th,

tlmelln,_ • F.E.T. Miller circuit, then runs up IinH,Iv

cherli". up the hold-eH CIIpecitor vi. 047 ."d r .. aning

the blnlble vie R1,4. When TR27 cuts off. TR34 co�

Telequipment S61 B

3.3.2

3.3.3

3.4

ducu Ind dischlrges the timing Clpecitor until 045 conducts .nd ,educes the cur,ent in TR34 to the velUl required bV the ,iming resisto,. At this point the flvback stops. During the flyback the hold-off c.pecitor dischlrge5 th,ough R114 until O4B conducts. At this point the actiOn is complete .nd the timlblse cen be triggered bV tht next t�iggering pulse.

If the Trig level control i. in the Auto poSition and no triggll' pulses Ire present, TR34 and 049 co nduct end ,educe the potential at the anode of 048. This allows tha hold-oH c.pecitor to disch,rge further end re-trigger the bistable. The timebese then free-runs. If trillll" pulses "e present a� the anode of 043 the positive pulses trig�, the monosteble TR32 .nd TR35. When t,iggered It fre­quencies ebov, about 10 Hz the IV.flg. co llector current of T.R35 is low and 049 is cut off returning the timeblst to the normal triggered condition.

The collector cur,ent of TR29 wh ich is cut off during the sweep is fed to·the input of TR28. The collector of TR28 gOls negltive at the beginning of the sweep until d iode 038 conducts Ind clamps the collector pottntial 8t about 3 v, thus unblinking the sweep. When TR29 conducts It the end of the IWMP TR28 collector goes positive bI.nking the trece. On chop positions of the sweep negative edges from the chop circuit Ire fed to the base of TR28 to blink the trace during the transitions.

HORIZONTAL AMPLIFIER Figun3

This consists of I shunt feedback nage TR3l with switched feedbeck resiuors to give XIS expansion. The sweep .nd horizont.1 shift currents Ire mixld .t the input of the Shunt feedback stage and the output is led to a 10ngt8iled poIir, TR33 and TR37, which faeds the hori­zontal deflection plates of the CRT. 044 clamps the cOllllCtor of TR33 and prevents it from bottoming.

On the EXT X and CH2 positions of the Time/oiv switch the input of TR31 is switched to the collector of TR26 via 033, 034 Ind 054 and the X5 feedblck resistor is shorted out by diOdes 033, 034, 035 and 037. The trace is then deflected horizontilly via the EXT X socket or from Channel 2. On these positions the illite of TR36

3.5

3.6.1

3.15.2

3,5.3

3.5.4

3.6.6

3.5.6

PAG E 2 O F 1 6

is connected to the cethod. of 047 which clamps the output of the timeblse It Ibout . , V and turns off TR29 thus unblanking the trace.

CRT CIRCUIT AND POWER SUPPLY ,.,n5 The supplV voltlge is fed vii the power ON/OFF switch S401, the fuse FS401 and the voltege selector SK401 to the 8ppropri.ie primery tipping on T401.

The -13 V line is Obtained from e full wive rectifier circuit consisting of 0405, 0406, C402 and R403.

The .,17 V line is Obtlined from a bridge rectifier 0401. 0402, 0403 and 0404 with reslI'Voir C8P1Citor C403 Ind smoothed by R406 end C408 to provide the +' 10 V line and by R407 and C406 to provide the +80 V line.

The -1050 V line is Obtlined from a h.lf wive rectifier circuit consisting of 0407, 0409, C41 1 and C412.

The +2600 V line is obtained from I vo ltlge doubler circuit consining of 0408, 0409, C401 Bnd C404.

The calibrator c i rcuit provides I 0.5 V squareweve at supply frequency. It is produced by I diode switching circuit in which I curr�nt derived from the stabilized -7.5 V line is passed through 0413 Ind R408 during negative half cycles of the AC voltlge from the 13 V transformer winding. On politive helf cycles 0413 is cut off Ind the current p ..... th,ough 0412 lind R402. The output voltage illft by R40I5. The tamper.ture coefficient of the diode 0413 II compenseted for by the negative coefficient of the output resistor A408 givi ng an output volt'gII which is nominelly independent of temperature.

Th. grid voltage of the CRT is derived ·from a zener diode connected between the CRT cathode and the -1050 V supplV. The voltage is varied by the intensity control R301. The intensity of the trIce may be lIIried bv signals fed vii the Z Mod socket SK301 and C301 to the IIrid of the CRT.

Telequipment S61 B PAG E 3 O F 1 6

SECTION 4 MAINTENANCE AND RE-CALIBRATION

Care must be uk.., not to touch high volt.ge t.lIS. The inst,ument MUST BE UNPLUGGED Wh.n r.moving the ene. removing 0' repl.cing the tube. 0' other components and where poaibl. during other servicing.

4.1 4.1 .1

4.1.2

4.1.3

4.2 4.2. 1

4.2.2

INTRODUCTION GENERAL

Th. IOlid sute design of the instrument makes frequent

adjustment of the internel preset components unnecessary. The appropri.te pert of tht re-cellbretion procedure should be carried out. whenev.r the instrument f.ils to meet Its specification. or whenever . defective component is repl.ced. S.ction 3 should be help fu l in deciding which pert of the circuit requires .djustment.

CALIBRATOR Th. int.rnel 0.5 V celibrltion signel .lIows the accur.ey of the vertical .mplifler system to be checked. The calibration signel which is .t supply frequ.ncy can allO be used to check the sweep speed to the .ccUrlCY of the supply frequency.

TOOLS AND EQUIPMENT To carry out the whole calibration procedure, the foilow i ng tools .nd equipment ere required:­Low-capecitance trimming tool (for prese t capacitors). Small screwdriver (for preset potentiometers). Amplitude Calibrltor, providing 1 kHz sqUlrewlve, empli­tude 60 mV, .mplitude .ccur.cy within 0.25'16. Tim e-mark Generator, providing markers of 1 ms, 1 }JS and preferably, 0.5 J.lS. Accuracy within 0.1 '16.

Squereweve Gener.tor, prOViding outputs of 1 kHz .nd 10 kHz, 60 mV to 50 V. Squarewave' Generator , providing outPuts of 10 kHz, 100 kHz e nd 1 MHz with rise-time less t hen 10 nl. Coaxi.1 cable .nd ter mineting resistor for the above. Manito, Oscilloscop., complete with Xl0 pauive p,obe. and having a sweep output lOcket. Pauive Probe, X 10 .ttenuation, suit.ble for input capaci· ties of 25 to 35 pF. Test Meter, 20,000 !l/volt 0, higher, IICcuracy wit hin 2'16

2.5 V DC to 2500 V DC. Compos it. TV vid.o sign.1 lOurce. Sineweve G.neretor, 1 kHz, 10 kHz .nd SO kHz. Co-axi.1 leeds .lIowing the same sign. I to be connllCted to Ch,nnel 1. Chennel 2 Ind the EXT lOcket.

MECHANICAL ACCESS TO INTERIOR

NOTE: UNPLUG INSTRUMENT FROM SUPPLY BEFORE REMOVING COVERS.

The cabinet covers a,e removed 81 fOllows:-,. The back cover is ,emoved by u ndoing and

removing the three fixinu scr8W$ and pulling the cover off.

2. The lower side plnels can then be slid bllCkWllrds out of position. To re-fit the covers it is necessery to slide the lower COV.,I into poSition teking care thit the Ilot on the lower edge engages wit h the raised portion of the lower panel bezel. Ind thlt the lug at the top is engeged. The ,eer cover should be slid into position lind the three screws inserted .

CRT REMOVAL 1. Disconnect the instrument f,om the ae supply. 2. Remove the covers" shown in 42.1 Ibove. 3. Short point k on the Pr inted Circuit bOllrd to ch.ssis

v ii I 1 M!l resistor lind keep thl short in plllCe for

4.2.3

4.2.4

4.3

4.3.1

4.3.2

,bout 1 minute to dischll'ge Iny residuel high wltlge.

4. Remov. the INTENS ITY .nd FOCUS knobs. 5. Remove the felt weshers end the PInel beering

the nlme TELEQUIPMENT. 6. Remove the 4 screws fix ing the plestic bezel

surrounding the tube fece .nd pull off the bezel end greticule.

7. Slide off the blllck section of the upper case by moving forward.

8. Spring down the ends of the springy ('�pper strip above the tube Ind slide the strip out.

9. Pull off the tube bile (It the ,eer of the tube) using the loop provided.

10. LOOseh the screws holding the climpi wh ich fix the reer tube Icreen to the plastic moulding lind slide these clllmps off.

11. Slide the tube gently forward ealing the mumetel pest the lower support Ind chlssis edge until the PDA cap is clear of the chillis.

12. Remove the PDA cap by pulling out end then slide the tuba right out of the instrument.

RE·FITTING CRT The procedure fo, re-fitting is the reverse of 4.2.2 above. C.re must be uken in easing the front of the mumetlll screen pest the chassis edge, end in keeping the PDA ClP cleer of the chessis f,ont.

REPLACING INTENSITY OR FOCUS CONTROLS If it Is required to replace either of these controls it is nec .... 'y to remove the C.R.T, IS above to ,lIow enough room to get to the extension spindles end fixing nuts,

CALIBRATION PROCEDURE

INITIAL SETTING 1. Remov e side covers, refe,ence P,ra 4.2,1. Connect

to I suiteble A.C. powe, source lind switch the instrument on. .

2. Set the front penel contro ls as follows:­AC-OC-GND ) GND VOLTS/DIV ) CH1 & 0.01 POSITION )CH2 Mid-position TIME/DIV I , rn. Horizontal POSITION Mid-POlition, pUlh in TRIG lEVEL Mid-polition, out (AUTO) ± + EXToCH1-CH2 EXT

AC-TV '

AC FOCUS ) Adjust for well defined INTENSITY) low b,illiance trice

SUPPLY LINE VOLTAGES (R668) D.C. supply line volteges should normilly lie within the prescribed limits when "'.C. power source voltege coin­cides with the setting of the line voltege select or on the r., of the instrument.

The -7.5 V line is Idjult.ble by meln. of R668. It Ihould normally only ,equire re-lltting when TR637 hes b"n replaced. If the movement of the treet il greeter th.n 1 div when the m,inl volt. i. idjusttd to ± 10% of nominel, u. the following procedura:-

Telequipment 561 B

1.

2.

3. 4.

Ii. 6.

7.

Set the Tilt M.t,r to, r,n!lf I"I..ole for menurinll 10V d.e. ConnlCt the neptlve tilt INd to tilt point 67 .nd the positive tett Iud to eh_is. Set CHI. CH2 AC.oc·GNO to GND. AdJutt R888 for. meter reading of 7.1i V epprolC' Imet'tv· Ae-check th. tree. movement fOf ± 1 � yerl.tion. If the lPICification cannot � met. rei" or lower the yoltege .ning which mutt remein within the limi..-of 7 V to 7.7 V. If � il ./t,red. til. V.rtical Amplifier Bel.nce procedum in 4.3.4 mutt btre-chlCked.

Supplv Lin, T.II Po int Limits

-7.!1V CHI POSITION pot.ntiom .. ., -7.3V to -7.7V yiolet-Olu, wi,.

+ 7.IiV CHI POSITION pottntiometlf +7.1V·tO +7SN Of.nge.wh/t, wire

- 13V Horlzonl.1 POSITION pot.n· -12.4V to -13.BV tlomet ... meuY�ite wi,.

+ 13V T .. t Poin13 +1'.9V to +12.1V

+SOV Tect Poi�t 22 +75V to +86V

.. 110V T .. t Point 29 +107VtO+I17V

-1050V T"t Point 166/7 -1060V to -1160'.1

+2500Y T.tt Point 1 56/K +2400V to +2500V

4.3.3

4.3.4

4.3.4.1

4.3.4.2

4.3A.3

ASTIGMATISM AND GEOMETRY (R306.nd R307) 1. S.t TIME/DIV to 100 J.II .nd displev • 10 kHz

linew.v. IllIn.1 on one ch.nnel onlV .t 8 divilionl v.rtical .mplitud •.

2. Adjult FOCUS .nd R306 (Altillmttilm) for best d.finitlon of dilplly. LeeY. 1 0 kHz Ilgn.1 connie· ted.

3. Set TIME/DIV to 1 ms . 4. S,l'et AUTO ,nd ensurl thlt no lilln.' i, eon·

n�ted to EXT. 5. Set EXToCH1·CH2 twitch to EXT 10 thet dilPlty

btcOfn,s In unaynchroniled rllter. 6. Adjult R307 10 th.t the relter become . .. nlerly

IS pOlllel. rectangul,r. 7. Disconn.etl0 kHz lignal.

VERTICAL AMPLIFIER

CHANNEL 1 VOL TS/DIV BALANCE (R604.nd R608)

1. ChICk thtt ChenneJ 1 input Mitch i. set to GND ,nd VOL TS/DIV to 0.01.

2. Turn Ch,nnell on, Ch'nnl1 2 off. 3. Connect tilt mltar between tilt point C3 .nd

ch_i •. 4, Adjult R604 for uro reeding. It .hould normelfy

be nlOHllry to Idjull R604 only whln TA601 h.I bHn rtl)1tctd. After edJUllmtnt of R�, R613 mult be checked .nd re-edjulted If nectlllry. s.. per. 4.3.4.5. Disconnect tell meter.

S. Switch Ch.nn.1 1 VOL TS/DIV betwHn 0.01. 0.02 • nd 0.01i POlitionl. Adjull R608 tc llimin.tl vlrti· cal movement of the tree..

CHANNEL 1 POSITION BALANCE (RI,.) , . Connect t.1I meter between Ch.nnel 1 POSITI ON

potentiometer movlnll contact (red-blul wire) .nd ehtIJiI.

2. Adjult POSITION for zero reldlng. 3. Adjult R6,8 to brinll the trlet to thl centre of the

ser .. n. 4. Disconnect tnt meter.

CHANNEL 2 VOL TS/DIV BALANCE (R704 and R708) 1. C,** th.t Chlnn.1 2 input Mitch is .. t to GND

• nd VOLTSID'V to 0.01.

PAG E 4 O F 1 6

2. Tum Chtnnel2 on.nd Chinn II 1 off. _

3. Connect ttlt mettr bttwaen tilt poln{C33 .nd the C"-il. '

4. Adjlllt A704 for zero rttdlng. It ihould norrnelfy a,. __ ry to Idjull .. 704 only whln TR701 h" betn repltctd. Aftlr edjulI· ment of R704. R713 mull a,. checkecf .nd ,.. tdJutted if ntclSltry. Set per. 4.3.4.6.

5. Dilconnect tilt met,r. 8. SNitch Channll 2 VOLTS/DIV betwHn 0.01, 0.02

.nd 0.05 po.ltion.. Adjutt A708 to .'lmlnlt' , vertical movement of the treca.

4.3.4.4. CHANNEL 2 POSITION BALANCE (R718)

1. Connect tilt mettr bttwHn Chennel 2 POSITION pot'ntlo,",.., moyinll conttc:t (rtcJ.blue wirl) .nd chtalt.

2. Adjutt POSITION for zero metlr reeding. 3. Adjull .. 718 '0 bring till trece to till cent.r of the

screen. 4. D iaconneet tnt metar.

4.3.4.1 CHANNEL 1 GAIN (RI13)

4.3."1

4.3.4.7

4.3.4.'

1. Stt Chinn. I I VOL TS/DIV to 0.01 .nd Amplitudl Ctllbrltor output to 50 mV.

2. Dlapltv Amplitudl Ctfibrttor output on Ch.nn.1 1. 3. Adjull the .mplituda of the diapllY to .xectly Ii

dlyilion. with R613. 4. Dilconnect Amplltudl C.Ubretor .

CHANNEL 2 GAIN (R713) 1. Stt Chlnnel 2 VOL TS/DIV to 0.01 .nd Amplitudl

CtUbrltor output to 1i0 m\,(. 2. DllPley Amplitude Ctlibretor outpUt on Chlnne' 2. 3. Adjull the amplitud. of the diapl.V to .xectiV IS

divillons with R7 1 3. 4. Disconnect ,Amplitude Ctlibretor.

PULSE RESPONSE (CM1. A671 Ind R6531 ,. Sit both VOL TS/DIV to 0.01. 2. Diap/.y • 1 MHz lQuerlWeY •• ign.1 limultln,ously

on both chennel •. (Enlur, thlt the co·.xitl ctbl. connecting the 'illn,1 to thl inllrument il correctly termineted).

3. AdJulI C641 .nd A6?1 to optlmi .. aqUlflW_ rlllPOn .. on both chlnnel •. If thl "apon .. of the chennel. i. not exactly the .aml. edjull for belt compromi".

4. Adjuat R663 to minimiZi thl chen!lf In IQUlreweYl rtIponle occurring whln .ither POSITION control II IdjUlted.

5. Disconneet aqUtrlW,VI lillnal.

ATTENUATORS (C902. et03. Cl04.nd Ci061

Ch.nnel 1 .nd Chlnn.' 2 'tt,nulton ,nd Input sellCtOr circuit •• re IftctriCllfy identical. CorrttpOnding compo­nents in t"'- partl of the two ch.nnel. Clrry the .. m. component reference •.

1. Set Chllln," input Mitch t o D.C. 2. Diapltv, 10 kHz aqulflWeYe of 0.5 V .mplltude

on Ch.nn.1 I, u.ing the 0.1 VOL TS/DIV potltlon of thl .tt.nuttor.

3. Adjull C905 for the bllt rlapon. (klu.r, corner without ov�""oot or undtranoot.

4. Set Chennel 1 Itt.nu.tor to 1 VOL TS/DIV Ind

inere_ the ,mplitude of the aqu.rlWlYe to IiV. 5. Adjlllt C904 for the bill ,eapon ... 6. Disconnlct IQU'rew.YI aign.l. 7. ConflICt. Xl0 p_iv, probe to the Input of

Ch.nnell. B. Set thl Ch,nn,'1 VDLTS/DIV to 0.01. 9. Diap/ty, 1 kHz klulrlWeY. of 0.5 V amplitude

v/t the probt. 10. Adjull the probe comptnsttion for the b.1t

IQU.rewlv, rnpon •. 11. Set VOL TS/DIV to 0.1 .nd incr .... the .mplitude

of the sqUlrlWIVI to IS V. 12. Without .It.rinll the probe eompan .. tlon. tdjust

C903 fOr the best aqulrew_ rlllPOn •. 13. Set VOL TS/DIV to 1 .nd incr ... the amplitude

of the IQU'rewl"l to 50 V . '4. Adjull C902 for the best IQU'rew_ rtJpO�.

Telequipment S61 B

1S. Ditc:onllKt .Ignal Ind probe. 1 6. Repeat Opa1 to 15 for ettlnnel2.

'.3.5 HORIZONTAL AMPLIFIER

'.3.5.1 OUTPUT STAGE BALANCE IR10e Ind Rn3) 1. With TIME/DIV .. t to 2 IN display I 1 kHz.ignal

lai-.ve or tqUlrMIW) on ettlnnel 1. 2. Adjult thl horlzon,., POSITION control to ttla

point whlra thl lefthlnd end of the tr.ce does not mow whln th, X5 IWltch II opllra'-<l.

3. Without re-adjulting the .pOSITION control, bring thl Itfthand .nd of the trace to the centrl vertical graticule line by tdjul1ment of A 113.

4. Potitlon the trace centr.lly on the seraln with the

horizon1l1 POSITION control. 5. Adjul1 R 1 08 for thl bIIIt horizontal llnelrlty It

the right and I.tthend Ixtremiti.. of the CRT .creen.

4.3.5.2 PRE·AMPLIFIER BALANCE IAl?, R4S end RaO) 1. Set TIME/DIV t o 2 rna . 2. Short till C2 or the tOP lead of C20 to ground. 3. Set EXT -CH 1 -CH2 lIoIVitch to EXT. 4. ConllKt teat met.r between tell point (H-) and

Ch ... is 1+). 5. Adjult R49 so thlt the tilt meter relding is

independent of tht position of the ± IWltch. 6. Disconnect the teat meter. 7. Set TIME/DIV to 1 rna . S. Adjult the lehhand end of the trace to the left­

hand edg. of the grlticul. by means of the POSITION control.

9. Turn TIME/DIV to CH2 Ind bring the .pot to the etntre vertiealgraticule line by edjul1ing RSO.

10. Set TIME/DIV to EXT X. 11. Bring thl spot to the central greticult line by

Idjulting R37.

4.3.5.3 CHANNEL 2 HORIZONTAL GAIN IR104) 1. Set TlME/DIV to CH2. 2. Set the output of the Amplitude Calibrator to

50 mV .nd connect to the input of Channel 2.

3. Set C"-nnel 1 input lIoIVitch to GND Ind chennll 2 input twitch to A.C.

4. Set Chennal2 VOLTS/D IV to 0.0 1 .

5. Sit horizont.I defllction to extctly 5 divilion with Rl04.

6. Dlsco'hnect Celibrator.

4.3.6 TAIGGEA SWEEP

4.3.6.1 TRIGGER SENSITIVITY IR3l) 1 . Set C H 1 end CH2 V O L. TSiD IV to , V end both

2. 3. 4. 5.

6. 7.

8. 9.

chin nels on. Feed 0.5 V 50 Hz SQuarewave tu both INPUTS. Set both AC·CC·GND switches to DC. Set TIME/DIV to 2 ms. Push TRIG LEVEL. in with TRIG switches let to CHlencl+. Adjult LEVE L for. triggered tr.ce. Turn A31 IInti-Clockwilt until multi·trigg.ring tlk" pl.ce. Note SlItting of A3l. Remove the 50 Hz input $ignel. F.ed 0.25 V 10 kHz sign.'to both INF'UTS.

10. Set TIMEIOIV to 100 J.II.

PAG E 5 O F 1 6

11. Turn R31 clockwl .. edjultlnll the LEVEL control If necetIIry to mlintain triggering until II potitlon Is I"IIChtd It which triggering can not be obt.ined or. the pot is fully clockwi ... Nott sening of A31.

12. Adjust Fl31 to halfway betwHn the two positions praviously no'-<l.

13. A.movt the 10 kHz input signal.

,.. Fttd. 1 div amplitude to 10 MHz slnlWlYl to CH1 end check that e locked trace can bl obtained by edjuatment of the L.EVEl contr:>1 on both +ve and ···"e. If not turn A31 enticlockwi .. aufflcient to obttln • locked trace but not IS fir II in 7 abOve.

1 5. Raput 14 on CH2 both +ve and -yeo

4.3.6.2 SWEEP STABILITY IA7.) '. RtrnOVI CAL signal. 2. Apply 1 1kHz Ilgnal. 3. Set TIME/DIV to 1 ms. 4. Bring the RH end of the treee on to the IerHn

u.lng the X POSITION control. 5. Adjult R7. IInticlockwise unti l the trace dis­

eppeen noting the position of the end of the trece

It tllet InIt.nl. B. Tum R74 clockwise until the timebelt ltarts to

frH run 'IIIin noting the position of the end of the trace.

7. Re-edjul1 R74 to bring the AH end of the trace "-Ifw.y betwHn the two pOSitions previoully rioted.

'.3.6.3 1mllDIV SWEEP ACCURACY IRst) This tdjuatrnent should not be p.rformed until any n.c· -ry tdjUl1menU hlv, b"n made to R104. SH Plre. 4.3.5.3. 1 . Set TIME/DIV t o 1 rna .

2. Dlsplly .1 rnl marker. from thl Time Merker G.nerator on Channell.

3. Adjust RS9 so thet marke,. .ra extctly ont mejor division IP8rt over the centre 7 divisions. LllVe Time Merk,r Gen.rltor connected.

4.3.6.' SWEEP LENGTH IA771 Adjust _p length to 10.6 division. with R77. Leave

Time Marker Generetor connected.

4.3.6.5 O.5I111DIV SWEEP ACCURACY (C2)

4.3.7

1. Set Time Merker Ga"erator to 0.5.us. 2. Set TlMEIOIV to 0.5 J.lS. 3. Adjust C2 (mounted on TIMEIDIV lWitc:ttlso thlt

one mlrker occurs for lien major division ov.r the centre 8 divisions. (A!ternatlvely. set Time Merker Gen. retor to 1 .us end adjust for one m.rker tvery 2 divisionsl.

4. Disconnect Time Marker Generltor.

INTERNAL CALIBRATOR (R406) 1. Set Chennel 1 input switch to DC. 2. Set VOL TS/DIV switch to 0.1 V.

3. Display I 0.5 1 kHz lign.1 from the Amplitude Celibrator .nd edjust P,6l3 for .xectly 5 divilions venicel d.fl.ction.

4. Remove Amplitude Calibrator signll end connect the internel callbrDtor signel to Ch.nnel 1.

5. Adjust the Implitud. of the displlyed signll to e"tctly 5 divisions with R405.

(0

l.L 0 (0 W � <t: a...

co ..... (0 (f) ..., c: Cl) E a. ::::l CJ Cl) Cl) r

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( PART SECT1OH£O ) TYPICIL. 5UOER SWITCH

23 24 � 29 . ____ � � 7

3 ----- ------ �

.?i

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MECHANICAL ASSEMBLY D61A

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NOTIS. I. • DeNOTeS �"TS HOT MOUNTiO ON '.C . .cAitO. a. 116ISS OIHOTIS ,C. 8OAAO/ UILIT 011 TUWlHAL .... COHN«CTIC)N. , AI.L WAVI'OIl ... ' MIASUA [ O WITH CAl. WAV!' OA ... 'EO TO 10TH CHANNIL5

VOLTS / D IY N T TO 0.1 TA IG aUCT OA TO CH. I AND TI""DIY TO a.s.

C'��f�!! OA 100"

. ..... . ... ,"'

Telequipment S61 B ... IIITOIII J U

11 JJ 120 121

112 �.eITOlt$ I 20 2t 31

.. ISC. I TH20 SIIII SIO

GM.a . TAIG. � ,1tOtot 190a II" 1'1C1.1

CH.a .

CM.I. . <:14

. 1 .

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1"21 C :21

UT. X TRIG.

\ 100. I"/CI

156, IC

SHF

+110'1

1!6/C2

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c ao 0 , ,,

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,. •• •• n

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51 :to T"::. THai 0�:1S ,.21 026 on 0)1

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156/)0 R�

CSI SK'

116/ 37 �n

U I

156/) 0 + 0

("OS ) lo l1 0

1 56132

11125

FAOM ASS lO R �6 113 FIG .l

NOTES.

RI2 6

lOR

oa . 026 027

� - r � 6Y� _I'L " 5.5 /&.

SOR

:t)R

021

II • • 6IC.

031

IOn

1.-______ ..... _ .. -tJY

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I . • olNOTlI COhlPOH&N T S NOT hlOUNTIO ON P.C. ItOAAD.

2. 156/C. DaNOTIS R C. 1OAa0 / IYII-IT 0'1 flAMINAL N • . CONNIC TI ON " SWITCH SHOWN IN 'ULI-Y ANTI- CL.OCKWlK POSITION . •. 'OR II IWITCH WAI',R, 511 I'IG. t . 5. ALI. WAV" OIIUo4 I hllUUIlI!D WITH CA L WAV" OR ... " 0 TO 1 0 T H

CHANN' LS YOUI / OI\/. TO'O .. U IG III.(C TOA T O CHoI AND T lhI! /olV TO a ...

Telequipment S61 B

u to IS .. 16 U . ,

Ial .6

II

TIl» OIS on 054 034

on 037 0)5

.. :: 64 U

.. 114 to

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TO C23 SWEEP Gf;N. Ft<;. 4

TO 51 III FIG. 3

ASl OKt

c

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156/ 1 3

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A S 6 1 8 K

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A S 7 'Ka

ASS 6K'

�C S6 14�7

156/19

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A" "

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• Sal x,

A66 18K

as

156/.9

..

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�.I . ...

All A99 � " " 20tC

R 70

C le � • 7A

'�1

A I 9 � 22"

A76 2U

156/96

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.... '"

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A79 39K

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AI07 l Ka

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IIOW!II SUPf'lV I"IG. 5 VJA. I�'/91

'-------�---__ FRO ... JU...c: TION A IOS . O.7 \56/ge "'G. 4

TR IG INPU T & HOR IZON TAL AMP D 6 1 A F IG. 3.

Telequipment S61 B

.. lIlfOAl I 22 24 2! Z7 ze 21 1 9 Z� ZO

CAMCI10RS J 59 14 Zl

MISC. J TP.21

S U4 22&

.. Ilv

C59

FROM AS2 FIG. 3 'V'A MP

t TRIG LEVEL

1 23 10>,

R 2 1 47 1'.

.. PAra OF

• 524 A 20 AUTO 1501'.

- 1 3v

P 2 2 471'.

156 18

R Z S 3 1 0

Q'9 .. R 2'-330... 1 5 0K

- 7 v 5 fROM

C 64 81C64 7 fIG 2 V'AMP

$ 1

R 26 ('3K

- 13V

a I SOO 200

.. ov

Ate 3K9

117 1 28 130 1 32 04 115 129 131 I l3

62 63 I I

TR 38 M7 TFo 39 S22b 0'56

2 26/4 � - -

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RPI ell,

P I27 201<

L _ _

058

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270 p

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TR J9

0'59

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P I34 I i 81'.2 I I I I I

059 I I I I I

R llS 31\3

'l'!',!7 _ _ PCE..6-.J -13V

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29 35 31 4i 51 :)1 m al 01 3 1 �

2t �2 64 IS

TR ZZ (' 21 T1i124 030 TA10 D62 Sl - �" 1. 22 061

.. 1J11

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A29 T(, :'56 1 2 5 lK6 A6 72 / R614

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- - - -, R JS I RIle I

1.2617 1 82M I 3K9 I C 29

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1. 21 16)1H

., f1M£ I OI v. SI -2f

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R l l6 l l l'.

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L _ __ _ _

5 0 0 - _ 100 _ tOO<> ��50 �.

200 0 � 20. NOT'ES I " DENOTES COMPONENTS NOT MOUNTIO ON PC. 80""'0.

so D 1 10 100 0 • 5 200� . a

SOO�. .# 1 •• t . _ -$

ell a

:2 . 1 S6/ 6C OlNOTlS P C. 1OAA0/ lvll.IT 01' TI"MII'W. H •. C ONN. 3. SWITCH SHOWN IN 'Ul.l.V .u1Tl - CI.OCKWISI POSITION. • 'OR 51 SWITCH W.ur EAS 511 "G. 6 . S. A1.L Wot.VEPOA .... MIASUAG WITH CA1.. WAV!I'OI'M nD TO IIQ1'H

CHANNlLS. 'tOLTS/ OIV. SIT TO 0' 1 . AND TIIIG. 'ILIECTOI' TO CH. 1 . AND T!MI / DIV. TO a •• .

6. PUSH 'ULI. f.WITCH U4 I' .MOWN IN THIE OUT POSITI OH

, 13 V

Telequipment 561 B

52

•• •• t s 61

71 U

036 052 SKU 0.5 TAl 4

Till 2 7

PROSE Oil Tf:Sf • 5 K 3 2

'., '\ < I S O !53

6 S 4 , ..

72 I 77

a 1 4 ,.

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� n . r - - -()0611 ...J ""-1 _ _ . _ . .1

S" S/div eE TWElN JUHTION 11101

, l Y (\.1!T 156/50

101

5

•• 5 1 - ) 11

105

7 6 S.

4' 040 5 1 -'1"

TII36 0.7 0)' TIIIZ9

1 14

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tI liS 7S 116 " 117 74 " '

+ 1I0V �

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- -/1

OSI

lOa ..

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TRlS 050

. 11OV r---

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f7

41 .6

S24

PAG E 1 1 OF 1 6

91 54 .. H .7

67 " 60 II.

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0.0 0,.

Til 32 043 nu. " 1I7V FROM

+ no_v ...... _-+� ... 111lY .. },ir� 1160 l O R

Itl l. IORHH " " 10 1( .. ']V

TO A89 150/OC 1501'0 � I(;. 3

1t07 IOn I I Ie

20V . I � J - - L-. . a ll -13 V �--�--�-----+�--�--�� + I'V

C 46 ... IOn .�

1111 S IC I

.. eMs � C I " � CU 1

_ ;;� 50p

T I OP ;t;�oI I I'Jo �� l c! TO C035 ( PaS l .o 8,) 1 't5POS � .o 1 4 )

' 1G . 2 6 - 51 2A ,P(,S 15 I. � )

0 47 ..... .... ,

C48 �= � A1I4 lOp · � .?I(

-Cll4

156/�0 t ,PeS 1 , 2 , �3 al \. - II: 18 0

�) IS6IC'� II IOI L[' TA30 S i ll � �52 1 fl U . A-O � '--____ .....;4:.:.'.:::0.:;1I_�_+_-_; ' I'

� R I I S >- 10 1(

1'1102 5601(

� 050 • C::

0.0 ;i+-.',

4,.7 � ASI

2 ? 1I:

ii, 038 OR IIOp �

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� ItS9 5 1C 1

FROM 1165 6 '1 0. 2

Y A MP I0Il

Ilf all

TO C R T I' IG.' I. 0

( Ttoo1 71:' .. � _________ --, ��I� '-..Ll 7.A:7 ( Pos e . '. 2u�: 1 S� I� , -0 (POS 7. ' l . '9 . ZC i 5 'b 3A J.c� Y.!cS l

AI5 :4 : PCS 6 . l l . 18,19 1 4 :\24 on 71.0 8 ) 3 1( 3 237 IC U ( !'CS � . ) 1 . I· . le , 3 C 6

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11 1 16 2 2 1(

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1101 31( 3

R 3 1 _ l t a IC � I POS U . 15 . 16 ; I:

R2 717 1(

* 053 • A I

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t-� __ -""I-' 1. . .. J � . uV

..-.. '-- ;; Ci\ (Y}TA 2 7 1 P TIUO ( _J /

6� - ' l -h ' T -h- · :OV l _ _ "_U · L · · OV 3V L/ L S"S/div t -

"72 S .. S/di, A63 1001(

l lCO

A 75 121(

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e / 79 A 74T: 101( - 13V - llV - llV

-' - I �V -

A l l 7 390R

..... -+--... �h 410. "-

"-

A IO 101(

ttL"�"'1I�f'��}�'TA�3�S-1�':'II�3�2i��_JDJ�� +--�_0 ... 4 .. l '--, 05 1 I - .... -

A I I8 12 1( I ! ,

R97 U 2

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i C;; 50= AUTO 524 I 10.T I I

r - - l - - .1'- ··OV tV / ..... 1... .

r -OV l . lOonS/etiv

, ; ! A 5 4 . 1 7 I 3 9 1( � )lOI( I I 156/97

-llV I I

SWEE P GENERATOR D 6 1 A F IG . 4 .

Telequipment 561 B PAG E 1 2 O F 1 6

.. ...,.oa. I 401

401 406 401

MIIC. I 11(401 T401 .U02

.401

- - --, I

l - - - -r-0Pc- - - - -lOV - - - - - -

J _ _ _ _

C 401

20S!

+ 1 I7V TO R 1 1 9 FIG. 4

1 56/12 ov \"";;--=r:-==-=-==-===-=-=-===:.....:=r20iii6

0401

C403 3301'

R401

I U / l • asoov

TO c.A.r a4 (P. o.,,)

r aoOR - �

11407 620R

205/20 - - -20515

SIC401 OV 271C )II

205/22 S401 � FS401

205/2 1 I 205123 250M I I POWER I Of4/0f'F I

205125 I � 205127

205124

I

� P. C. 2 0 5 - - - - '- - -

234V 214V I 13V

150 ( -A- �1�2V 040S .V .7 -� "'-

I I

1I1V I I

� __ +-___ """I---., S.s/dIY I lv :�-I 5.5/;11.

1 56/2 2 Sov C 406 TO 11 655

FI G. 2 7V I OV

I I 11V

ov I I I I I I I I I I

� I I

- - - "

'-v-' TO CA.T. H!tATeRS PlN 5 2 "

0406

205/1 7

0407

C402 2rrt2/21112

S. Sld i.

/ I3V[ � -.;:rv - ·ov

5.5/d ..

11405 IOIC

- ?-S V

MOTtL FROio! C 64 8/C 64 1

F IG. 2 'Y'AMP. I . • o.MOTIS COMPONINTS NOT MOUNT I O ON P.C. lOARo.

2. 1 5./ a DINOTIS PoC. IOARD I IVEI.IT 011 TIRMINAL .... C:0f4N£CTION

3. AI.l. WAVIFOAIotS IotCA5UAlD WITH CAL. WAVIFORIot FED TO 10TH CHAHNaLS. VO\.TS / OIV. st: T TO 0,1, AND TRIG. SELECTOR TO CH. 1 . AND TIIotI/ DIV. TO a.5.

.. SI-2F FIG4

156/2 1 156,.2 , �

( \ . 1K402

CAL /()05 V �'

Telequipment 561 B

• 0' . 1 1 . 1:1

I I I I I

109

OJOI

- - - - 1-

s.s,�".

PAG E 1 3 O F 1 6

JOI lOS XII lOa 106 lOt len 104

Jo.

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- - - ] 2OS' .. + 1 10 V l + i10 V

TO FIG 4 SWf:EP I GEN•

JO • 101

"'TIG 15"" C 302 ";:'IOa

� - -

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IICIOI

+ :1100"

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- , I

: : : : 1'8302

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POWER SUPPLY & C . R . T. - D61A F IG . 5

aa ___ J ,,---.. . 1

L-. ___ e l M'l SQNNIST'QH'

to

l.L o � ..-w <..:J <t: a..

co ..-to (f) ...., c:: Cl) E a. ::::l 0-Cl) Cl)

r

FOB BEl.T�D CWITS SEE fIG.·S 3& 4

51 - IF

0 0 0 ° o 0

o 0 o � o E9 0

... . . . 1 .)· 12 \

51 -2f

fAOM 1) I fl\Oto4 RIll +I0Il .... . 4-22 , 0 t o o 2ZfJZ6 flG. 4 O ,� 0 / o � � �S o o o

o

fAOM taIOS 156151 fIG. 1

51 - Jf

0 0 0 0 21": �O

O o 0

19 .... t"I'I. 0 OW ...... , o 0

0 ." J '. '., 15 0 0 0 10

U \ FR(J04 047 1 esc.

1561" FIG.4

F100C C704 51-1R +uv Ff04 156/. fIa 18, 1 156IJ; fIG. )

SI - 2R �F� SI - JR FIG. 4 ,

oO�O O . O "

o 5

: ED -:7 o 0 o 0

MOttS.

o 0 0 0 0 0

�ooo O /l J 0' �4

o 0

II E9 -' o

..... 7

/ Z I . . :: f� RIOI/TA34 13

1!6/C9 fIG.4

L s.ICH IS 5HOWN If I'UllY ANJIQ.OOIWISE POSITION. 1. 1eD. ' 01' POSIIIONS ZI.

TIME/OIV . SWITCH

0 0 214 ill oO��4

° �s

o ED '-" o

. 0

o 0

o °

0 0 0 0 0

D61A

FOR R�l.TED CIRCUITS SEE FIG.·S 1. & 1B

S902-1f fR(J04 S9Ol-lR fR(Jo4 R901 "9S. 1 fIG. IA

16114 fIG. IA" 0 0 / FROM ,..---: 20 0 0 3 III,. flG. 1A 20 0

0ff.' '?O 0 ' o 0 0 0 o Ee 0 0 0 7 0

0 0 \ 0 14 0 FROIoI REOI I 0

f� C9Cl&--- 0 0 0 0 R&02 flG.1A 0 0 161t2 fIG. IA

S9Ol- 1R

F�IG.':'3� 21\0 0 0 fAOM S902-1f o 0 /POS. 4 FIG. IA

:O�EB .,-; ' - Fr .... t90I 1 C902 o � 0 FIG. IA

o /15 0 0 FROM 11901 0 0 0 0 1&111 FIG. IA

NOTES . I. SWilOi IS SHIMN If fILlY ANTICLOCKW1S£ FOSllION. 2. No. (F POSITOIS ,.

\ 156/C) CH.I ..... 18 FROIoI 155/03 CH.2

VOLTS/OIV. SWITCH -MK 2

Telequipment S61 B PAG E 1 5 O F 1 6

n z �

... ... 0 0 0 0 .:. ... < < < < J J 0 0 at at m m

..

i

0 ... - ... .:. .:. 0 0 < < < < "D "D :II :II 0 0 at at m m

n z N

Telequipment 561 B PAG E 1 6 O F 1 6