Roberts-192FT-tape-sm 维修电路原理图.pdf

PnoTo FAcr FolJtroEto-tOErJ, vlROBERTSMODET I92FT(G O., I N G. tndianapotis i, tndianaHCDWARD W. SAlYlS &The listing of any available replacement part herein does notconstitute in any case a recommendation, warranty or guarantyby Howard W. Sams & Co., Inc., as to the quality and suitabilityof such replacement part. The numbers of these parts have beencompiled from information furnished to Howard W. Sams & Co.,Inc., by the manufacturers of the particular type of replacementcQ5i4Flrlnoll- Ol-lr|6E4gE3OtE9mtFlnlltTRADE NAME Roberts Model 192FTMANUFACTIIRER Roberts Electronics, Inc. , 5920 Bowcroft Street, Los Angeles, CaliforniaTYPE SET AC Operated STube-lTranslstor, Single Track Monaural Tape Recorder(Units are available for 2-track monaural operation)powER suppl,y I05-I20volts AC, 60Cycles RATING 60watts, .58AmpoUTVAC (With Deck)35Watts, .33Amp ll7vAc (Amp Only)part listed. Reproduction or use, without express permission, ofeditorial or pictorial content, in any manner, is prohibited. Nopatent liability is assumed with respect to the use of the informa-tion contained herein. 01963 Howard W. Sams & Co., Inc.,Indianapolis 6, Indiana.Printed in U.S. of America(mO.N)NTTo|-ImF(JrDATE 3-63SET 622 FOLDER I 5RadioFans.CN 收音机爱 好者资料库FRtrOUENCY RESPONSE:40 to 15,000 cps at ? l/2tps *2 db; 40 to 9,b00cps at 3 3/4 ips + 3 db.SIGNAL- TO. NOIS E RATIO:55 db below recorded 0 Ievel.WOW AND FLUTTER:Les s than 0. 1B7o rms.HEADS:FuIl-track erase and record/playback in shieldedhousing.SPECIFICATIONSPREPA RING FOR OPERATIONOUTPUT:6 watts undistorted.REEL SIZE:? maximum (up to 2400 ft. of tape).POWER REQIIREMENTS:95 to 120 volts AC, 60 cvcles, 50 watts.SIZE:15 3/4 xt4 t/2 xI t/2.WEIGHT:Approx. 28 lbs.l.tRemove lid from carryingRemove microphone andstorage compartment oncase.case.AC supply cord fromleft side of earrying3. Make certain all controls are in ttre neutral po-sition.FUNCTION OF CONTROLS0n-Off SwitchWhen the switch is pushed to the All-On posi-tion, power isturned onto theamplilier and tapedeck.When the switch isin the Amp-Off position, power isapplied to the tape deck only. The Of position turnsthe power off to the entire unit.VolumeTurning this control elockwise increases thevolume during playback and the recording level whenrecording.ToneThis control functions in playback only. Turn-ing theeontrol clockwise increases thehigh frequencyresponae and turning the control counterclockwiseattenuates the high frequency response.PIay-Record and Record LockThis is a 3-position eontrol: Stop, Piay, andRecord. Turning this control elocknrise from the Stopposition, places the unit in play. Depressing theRecord Lock and turning the control to the Recordposition at the same time, places the unit in RecordN0TE: This control is interlocked with theRewind-Forward control. It must be inthe Stop position before the Rewind-For-ward control can be operated.Rewind-ForwardTurning this control to the left places the unitin the Rewind model to the right places the unit inForward mode of operation.NOTE: This control is interlocked with thePlay-Record control. It must be in theStop position before the play-Record con-trol can be operated.PauseWhen this lever is raised, pressure is removedfrom the eapstan, and the take-up reel is disengaged.This permits spot editing and momentary stops.PAGE 2RadioFans.CN 收音机爱 好者资料库.:, ?ttf i()Fig. l. TopVieur of Tape Transport Mechanism.O PERATI NG I NSTRUCTIONS3OpE9trtpsdttThreading the Tape1. Place a full reel of tape on the supply reel spin-dle (27), making certain the reel slots engagethe protrusions on the pan. Place an empty reelon the take-up spindle (67), again makingcertainthe slots engage the protrusions on the pan.2. Unwind about 14 inches of tape from the supplyreel. HoId a section of tape taut and insert intothe tape slot, making sure the dtrll-coated sidefaces the rear of the recorder.3. Insert the free end of the tape into one of theslots in thehub of the take-up reel. While hold-ing the end in place, rotate the reel to securethe tape and take up any slack.To Make a RecordingI. PIug a microphone into the Microphone jack.Place the High Z iiltric- Low Z Mic switch in theproper position to match the impedance of themicrophone.2. Plaee the Pause lever in the Up positionl de-press the Record Loek button and at the sametime rotate the Play-Record control to theRecord position.3. Preset therecording level by adjusting the Vol-ume control until the indicator goes up to thered portion of the scale but does not enter thered portion except on loud passages.CAUTION: Do not eonnect a speaker or otherlow impedance load to the Output jack whilemaking a recording.To Play Back a Tape1. Thread the tape as described under Threadingthe Tape.2. Turn the unit on and allow a few seconds for itto warm up.3. Turn the Play-Record control to play.4. Adjust the volume and tone to the desired list-ening level.Speed ChangeTo change the tape speed from 7 L/ Z to B B/ 4ips, remove the thumbscrew and bushing from thecapstan. When the bushing is not being used, storeit on the bushing post.lndex CounterAftera tape is threadedon the recorder, set theindex counter to 000. The index numbers ean thenatoF(fm7J(lrPAGE 3- -.rFig. 2. Bottom View of Tape Transport Mechanisfn.be noted at the begindng of each selection for future Efasing a Tapereference To eraae a tape wlthout putting a nev recordingEXtefnal Speakef on it turn the Volume control to minlmum and thePlay-Record control to RecordAn external speaker may be plugged into theB ohm out jack. ihe intenai speat e-r-vitl be dis- To Record from a High Signal Level Sourceconnected r hen using an external apeaker.To record from a radio, TV receiver, or tuner,plug the signal aource lnto the Rad-Phono jack. Usethe same recordlng procedure aB de8cribed under ToRecord llom a Microphone.D ISASSEM BLYTo Remove Tape Transprt f rom Case t. ffil:lS: lour acreqs holdins the transportl. Remove the two acren,a in the splndle paDs (oneln each pan). 8. Unplw all connectlona to the tape transport and2. Remove the tno acrews holding the dreas plate spealrer and lift the tranaport from the caseand remove the dress plate. - 9. Toereasaemble, reverae the foregoing proed-3. Removeone screwon the rlght side of the eacut-cheon and lhe 7 r/2 tps bustrlng from the left To Remove the Amplifier from Caseelde I. Remove four screwa holdlng amplifier and es-4. Remove the pressure roller. cutcheon to the ease.5. Remove the Play-Record and Rewind-Forward 2. Unplug all connecting cablea.knoba 3. Lut the ampllfier from the caae.6 Remove the eacutcheon 4. To reassemble, revelse the foregoing proced-!e.PAGE 4Record- Playback Head A lignmentl. Thread a standard alignment tape on the trans-port as described under Threading the Tape.2. Connect an AC voltmeter to a standard phonoplug and insert the plug into the Output jack.3. Remove the head cover.4. Insert ascrewdriverthrough the holein theheadinto the alignment screw.5. Playthe tape back at full volume, and rotate thealignment screw in either direction until the10,000 cycle note gives the highest meter read-ing.Brake ShoesWhen brake shoes (34) and (80) become worn,loosen the mounting screws and rotate the shoes a fewdegrees until a new braking surface j,s exposed.ADJUSTMENTSLUBRICATIONCLEAN I NGTROUBLE CHARTLubricate the following parts every three monthsin heavy service, every six months in moderate ger-vice, or once a year in light service.l. Supply and take-up reel spindle shafts, with twodrops of light oil.2. Rewind idler bearing and take-up idler bearingwith one dropof light machine oil on each bear-ing.3. Apply a liberal amount of light machine greaseto the pressure roller bearing shaft. Replacethe pressure roller and wipe apay any excessgrease.4. Remove the thumbscrew (120) and? L/ 2 ips bush:ing (l2l) from the capstan. place a few diops ofoil in the oil hole in the capstan retaining ring.Allow the motor to run for a few minutes. Wipeaway any excess oil and replace the bushing.5. Place a small amount of grease on the indexcounter rilorm gear.6. Applya liberalamountof machinegrease to eachroller on all levers and cams.7. Disassemble the motor and saturate the upperand lower oil pads. Clean away all excess oil.Most defects, other than wear or breakage, canbe traced to dirty surfaces with which the tape makescontaet. The Record-Playbaek head, capstan andpressure roller may accumul,ate a coating of residuewhich is worn off the tape as it passes these parts.Usinga soft cottoncloth and aleohol, clean thesepartsperiodically.=OnE9Et7lsd.llSym ptomCauseRemedyMotor does not run.AC cord disconnected.Fuse blown.Defective motor.Connect AC cord-Replace fuse.Replace motor.I.2,3.t.2.3.Noisy playback or poor highfrequency response.Heads misaligned.Head magnetized-See Record-PIayback HeadAlignment.Demagnetize head.i.2.l.2.Wow or flutterspeed.at 7j ips1. Speed change bushing (f2l) slip-ping on shaft.l. Tighten screw (120).Insufficient drive3 3/4 ips speed.at 7! orl.2.3.4.Defective main drive idler wheel(31).Oil on capstan.Defective capstan drive belt(u8).Drive motor (I24) defective.l. Replace main drive idler wheel(3t).See Cleaning.Replace belt (ll8).Replace drive motor (124).2.3.4.Tape spills when going fromRewind or Forward to Stop.Reel diameters unequal.Brake shoes (34) and (80) wornor out of adjustment.Tape reels must have the samediameter.Replace or adjust brake shoes(3a) and (80).l.2.l.2.Index Counter doesnot func-tion.l. Counter belt (12?) worn or bro-ken.I Replace counter belt (127).No takeup or fast forpard.l. Forward idler tension spring(32) disconnected or broken.l. Connect or replace Forward idlertension spring (32).TIo0mF(.tNo tape movement in Playor Record mode.l. Pressure roller tension spring(51) broken.I. Replace pressure roller tensionspring (51).PAGE 5PAGE 6Fig, 3 . Exploded View of Parts Above Baseplate=OnE9nrdVsdrtA PHOTOFACT EXPLODED VIEWHoword W. Soms & Co., lnc. 1963wRrer -IIIIlrTIoF(mndUIPAGE 7Fig. 4. Exploded View of Parts Below Baseplate.Ref .No.PartNo.DescriptionI2345678Il0llt213L4l5l6l7l8l9202t2223242526272829303l3233343536373839404I424344454641484950515253545556515859606l6250-4 350-1550-4?52-2750-1650-2250-2250-1750-2950-9050-?950-8150-0852-2352-1250-8950-7850-B?50-0352-0450-9250-8250-7?52-6652-4350-8552-085t-775l-0650-5752-045Z-0752-2652-ll50-4853 -9350-5552-9052 -0552-8252-10Screw, Reel TableReel TableScrewPressure RollerTransport Deck PanelKnob, Play-RecordSet ScrewKnob, Rewind-ForwardControl and Head PanelScrewSpring BracketSpring, Brake Activating LeverLoadTie LugRetaining RingLever, Take=up BrakeSpring, Take-up Spindle BrakeTensionTake-up Brake Assembly(Includes Shoe & Bracket)Pause LeverSpring, Pause Lever TensionRewind-Forward Operating C amSteel BallRewind-Forward Control PivotRollerSpring, Forward ldler LeverReleaseLever, Brake OperatingLever, Forvard Idler OperatingTape Deck BaseplateTake-up Spindle (Complete)Splined Roller (Part of 2?)Retaining RingWasherMain Drive Idler WheelSpring, Forward Idler TensionLever, Forward-Take-up IdlerPivot BarBrake ShoeScrewTake-up Arm PivotScrew, Roller SecuringLever, Pressure Roller PivotRollerPlay-Record Operating CamShorting SwitchLever, Rewind ActivatingRecord Lock ButtonSpring, Record Lock BladeScrew, Record LockLockwasherInsulatorInsulatorRewind ldler WheelLever, Renind PositioningSpring, Pressure Roller TensionSpring, Rewind Drive WheelTengionScrew, Head CoverHead CoverScrew, Head MountingHead Assembly (Fuil Track)Retaining RingWasherRewind Intermediary WheelScrewBracket, Rewind IntermediaryIdlerSpring, Rewind-Idler ReleaseMECHANICAL PARTS LISTRef .No.PartNo.Descri ption63646566676869707L727374?5?6777879808l8283848586878889909l9293949596919899r00l0l102103r04r05106r07108109ll0lurt2lt3l14ll5u?II8ll9120L2Lr22r23t24125r2612712812913050-4450-2050-4550-6352-4652-0652-4250-6550-?750-7550-?650-0?50-6650-3850-5350-9752-795r-0150-995r-7552 -5352-0350-3452-4552-445l-9450 -5550-1450-6750-6 8*50-69Screw, Tape GuideTape Guide Top PlateTape Guide WasherTape Guide BaIl BearingSupply Spindle Assry. (Comptete)Supply Spindle Rubber TireSpring, Conical SpindleWastrerRetaining RingSplined Roller (Part of 6?)WasherScrewSpindle Mounting PlateSpring, Supply Spindle LoadWasherRetaining RingScrew, Brake Shoe MountingTake-up Spindle Brake ShoeLever, Supply Spindle Brake LinkBrake Shoe NutSprrng, Supply Spindle Brake LoadIndex Counter AssemblyTake-up Spindle Mounting PlateControl Assembly BracketRewind-Forward DetentWasher, FiberCamSpringIdler-Lift Operating CamSet ScrewRewind-Forward Control ShaftControl Assembly Bottom plateLockwasherScrewSpring, Take-up Spindle LoadSpindle Spring Retaining CapWasher, FlatRetaining RingSpring, Forsard ldler Lift LoadPlay Control ShaftScrewNutLever, Idler LiftingAmplifier Switch Bar Control CamScrewWasherCotter PinScrew, Amplifier Switch BarSpring, Amplifier Switch SlideBar TensionBar Lever, Amplifier SwitchOperatingWasher,FiberRetaining RingRubber Motor MountFlywheel and Capstan AssemblyCapstan Drive BeltMotor Mounting PlateSpeed Change Bushing ThumbscrewSpeed Change BushingKnurled Motor BushingScrew, Motor MountingDrive MotorSet ScrewIndex Counter Pulley* Index Counter BeltSet ScrewIndex Counter Spindle PulleyCotter PinPAGE 8* WALSCO Replacement Part # l4l0-546AR56BQs6X46AU6 6AU6Fig. 5. Top View of Amplifier Chassis.=OnE9tEtVSdttTIoFIm71(JlFig. 6. Bottom View of Amplifier Chassis.PAGE 9l-lrUI(lFc)/,eaxEOElR6EEooB?Ea9(.) (JHeF_Jd!l-u=c)-o?CJo66o-E .-F=,a, = :tt;v-E =ltfidaPH?OE-ez-=E=6aEEPUeA-T(JF=J=Zo&.o(-)tszo=F=c)oUz=Z, CJ8HOFz.zOo=.z-6O9Jd=F(edv)uotULt/t O= u6iJ2-=b u6 2ttt =, O6 ii o5 H*:gz 6E +=oFHL-= Ee =- = i3s22 =gsH= 1r-f oL = = =Iou E c4 - -r=8eE= =FE:; i =-*2o attt-= = oEgK E H = 6t-JFH,.it*-5 -ttt(9z.ou&t!c)z.F./t,taud.No-=JeUFu=Eqtoo-6=Lii oa IOO ZG5 )3=*5uEE(./) o9-Eo.F9.!z=*EE-LL=ozz.=o!o=I(JF=;6oeFREut6zFos=FErHe.eF - F- 96eE q*g asE E i 67Ep 8- F- c=3FE-o-:e Fot PE _- OeeE*5 zdc* i E o 9 Es = zEF E5: o: E: 4HE!F fr_ tr o= c o=:=Eb u_A55F= fsri .c; PoI6-Jz=FEoGooot!=:zoEoHEuc)E=tlt EoNrooBo=ooCuc)&.OCpoOO6Nooonc)zoocoooNco-?st+c)2FCLoaE!z6o+(-)=o)lo!zoJLoottL)z-tJLJLJu!4JrJrJ4JrJ;oc5Zooo(-)zlzoooLz!zoorN=oocoe.s=uFcrhcsoFe ltJo-:zooEeEEooc-A(.ryo.)crtoN=tr-=a/aV9-roo/Ao(uaulJmcos=/4,t+JIr,EEAIll!Fo?ooEAGooENouNe.JC)o_2Oz.CL=FFe.oo-z.eFGuotFFc./)at)!DCJ, ,n.Ur i-l =iijn-u_ I r_irrPAGE IOWIRING DATAceneral-use Unshielded Hook-up Wire ., Use BELDEN No. 8530 (SoLid) Available in 12 Cotors8524 (Stranded) Available in 12 ColorsPower Cord Use BELDEN No. l?106 (Pla6tic) or I?126 (Rubber) - 6 Ft,l?109 (Plastic) or 17129 (Rubber) - 9 Ft.PowerCord(InterlockType).,.,. .,UBeBELDENNo.88?4(Rubber)or8895(plastic)Low-Loss Shielded Lead (Interconnecting) . Use BELDEN No. 840i or 842IPhono Pick-up Arm Cable .,. Uge BELDEN No. 8430 (Two Conductor-Unshielded)8429 (Two Conductor-Shielded)8419 (Ttrree Conductor-Shielded)AMP PARTS LIST AND DESCRIPTION* Not normally in distributors stock. Available thru distributor on order to nanuJacturercoNTROtSwotl0ges l/2 wott, 01 less, unless otherwise listed.3Opo6tr;lttJ-t)