SERVICE MANUAL & PARTS LIST - Pacific TV Online Tube Catalog
Contents
1. No 4 Gear Assembly 28X141 Spreader Springs for Gears 3 and 4 dz 26A TI aya Pulley Bracket Asesmbly complete with Gear No 5 Pulleys and Roller Bearing Assembly n 25A186 No 5 Gear and Drive Arm Assem only IAY Reversing Switeh n 37X98 Lever for Operating Reversing Switch 28X158 EA Centering Spring used on Reversing 95 05 20 20 05 20 20 25 55 ER 20 25 55 35 05 20 1 20 05 05 70 20 25 ER 40 20 ER 20 1 70 ER ER KP 08 20 ER 40 20 20 20 20 ER 20 20 20 2 80 bh 60 20 Part No Description List Price Ea Switch Lever crueis as 20 25 54 E ecw Bracket for Reversing Switch 20 ZbA29n Silencer Spring Assembly complete WITH SWIG Rue gg dn 30 BEDE sccscw Glass Sereen REESEN Sen 95 SORBI oe Ciamp for Glass Screen 05 Tone Indicator Assembly ER Volume Indicator Assembly 25 Spring for Tone or Vol Indicator pr 05 Brass Collar Used on Tone or Volume Control Shafts cmimeve opni 15 Shipping Support Bracket Top of Elec tric Drive Panel to Wooden Brace 25 Rubber Cushion Used with Shipping Support Bracket a cerere 15 PROJECTOR ASSEMBLY PARTS H EIEEE REE Gang Condenser and Projector Assembly complete Includes Condenser Mounting Bracket Condenser Drive Drum Film Drum Cables and Pulleys Film Drum Support Bracket Film Drum Film Lamp2. 2 Touch Tuning Buttons and Arrangement of Controls PROCEDURE FOR SETTING THE TOUCH TUNING BUTTONS It is advisable to become familiar with the opera tion of this radio and tuning with the manual control as described in the Operating Instructions Booklet before attempting to set the Touch Tuning Buttons There are eight buttons on the touch tuning dial by means of which eight stations may be set Any but ton may be used for any station you can receive List your favourite stations any number up to and including eight Turn the electric manual lever to the electric position See Fig 2 Push in one of the eight touch tuning buttons the button will stay in After the motor stops push the setting button located directly above this touch tuning button all the way in and hold the setting button in Be sure the setting button is pushed all the way in If it is not pushed in far enough the tuning knob will turn but the dial figures will not move Select one of the stations from the list you have made out and carefully tune in this station with the manual tuning knob in the usual way using the tuning eye as a guide The final motion of the tuning knob should be to the left Turn this knob to the right past the point of maximum closing of the eye Then turn the knob back to the left and with the tension on the knob still in this direction release the setting button just before the point of maximum closing of the eye is
3. SHOES DO CIRCUIT DESCRIPTION On intermediate or short wave the 6A7 tube is coupled to the antenna circuit by a tuned an tenna coil T2 On broadcast however the tube is preceded by a pre selector stage consisting of two tuned coils T1 The desired band is obtained by a three position selector switch The oscillator coil is a self contained unit consisting of three os cillator coils and a parallel trimming condenser for each secondary Following the 6A7 pentagrid converter which acts as an oscillator and first detector is a tuned I F transformer T4 the 6K7 I F amplifier tube and the second tuned I F transformer T5 The two sections of the 6H6 twin diode tube are con nected and serve to rectify the I F signal The diode load developed across resistors R13 and R14 is fed to the 6F5 audio tube through condenser C27 and volume control R15 The output of the 6F5 is resistance coupled by R20 R22 R23 and C33 to one of the 42 push pull output tubes and to the 6F5 phase inverter tube the output of which is resistance coupled by R21 R24 and C34 to the other 42 push pull output tube The out put of the push pull stage is transformer coupled to the dynamic speaker The automatic volume control voltage developed across R14 supplies through the isolating resistors R8 and R1 a negative voltage which is automat ically regulated in proportion to the incoming signal to the 6K7 ist I F amplifier tube and to the 6A7 t
4. glass screen from the panel by taking the screw out of the bracket in the upper right hand corner and loosening the screw in the lower left hand corner Remove the four screws with heads painted red Two at the bottom of the panel and two under the glass screen DO NOT remove the screw on each side of the shaft extending through the cen ter of the panel The panel can then be pulled straight out from the chassis To replace the assembly reverse the above pro cedure When mounting the panel care must be taken that the drive arm on the drive gear and spring clip on the gang condenser drive drum line up properly To do this allow the front part of the chassis to nroject two or three inches over the edge of the table Turn the gang condenser until the spring clip on the drive drum is at its lowest position Spread this spring clip with a small screw driver bringing this screw driver up from beneath the chassis Care should be taken not to spread the spring clip too far Turn the gears on the electric drive panel until the drive arm is at its lowest position Gentlv push the drive arm into position in the spring clip on the drive drum The screw driver will drop to he floor CAUTION When the electric drive panel is removed from the chassis lay it face down and not back down The reason for this is that there is a possibility that the motor ON OFF switch on the back of the panel will be damaged or thrown out of ad justment In h
5. lead to the antenna of the receiver in series with a 00025 Mfd condenser The ground from the signal generator must be con nected to the chassis and externally grounded With the band selector switch in the broadcast position the dial of the receiver set at 1500 K C and the volume control turned full on adjust the broadcast oscillator trimming condenser located as shown on the chassis layout chart until a sig nal is heard Note There may be two signals present use the one obtained by the minimum capacity setting of the trimming condenser and adjust it to its peak Then adjust the broadcast antenna and pre selector trimming condensers for maximum output 600 K C Set the receiver dial and the signal generator to 600 K C Adjust the 600 K C pad ding condenser for maximum output While mak ing this adjustment rock the tuning control back and forth through the signal until maximum out put results Following this it is advisable to repeat the pro cedure outlined for 1500 K C to compensate for any slight discrepancy caused by the adjustment of the series padding condenser The broadcast band sensitivity is 5 microvolts at 1500 K C and 10 microvolts at 600 K C Intermediate Band DM C Set the signal generator to 5 M C and connect its output to the antenna of the re ceiver through a 400 ohm resistor The ground of the signal generator is connected to the chassis and externally grounded Turn the band selector switc
6. volt line Should the electric mechanism cease to function this fuse should be replaced with a 5 ampere fuse Serious damage may result if one of larger current capacity is used PHONOGRAPH ATTACHMENT An electrical phonograph pickup with its ter mina s connected to a telephone plug may be at tached to this receiver by plugging it into the jack at the rear of the chassis as indicated on the chassis layout chart When the plug is in place the receiver will not function as a radio but only as an audio amplifier A senarate volume control is unnecessary as the control on the receiver will operate on both pick up and radio When an electric phonograph motor is used the motor frame and the pick up arm must be grounded to the chassis VOLTAGES All voltages indicated on the diagram are meas ured from the chassis with a voltmeter of 1000 ohms per volt Readings were taken with volume control turned full on line voltage at 115 volts and antenna and ground leads shorted together VOLUME CONTRGL ane ON OFF SWITCH 2ND IF TRIMMERS IST LE _ TRIMMERS e SPEAKERT SOCKET ELECTRIC MANUAL CHANGE OVER SWITH WAVE BAND SWITCH d MANUAL TUNING i 4 _ TONE CONFROL PHONO PICK UP JACK BCANT remi U el DT ENT re SEY SOCKET INT ann SAL 6 ANT COIL z 1500 KC OSE o TRIMMER K A MAT Na 138 ANT GND Ok PADDER OSC COIL Fig 1 Chassis Layout Chart SPEC
7. Bracket dz 25 20K201 Stud Used with Above Grommet pr 05 20X 150 Stud for Mounting Rear of Gang Con denser to Chassis 00 0 00 20 25X362 0 0 00 L Bracket for Mtg rear of Gang Condenser to Chassis 20 6X18 Rubber Grommet Used on Above E E 05 2X236 Rubber Washer Flat Used with Above Bracket nc dz 25 10X26 iaire Film Drum Drive Cable 0 0 08 40 24X284 Film Drum Only tLess Film 60 80X84 Clamp for Holding Film to Drum dz KE 25A199 Color Filter Assembly Bracket 20 25X394 Lens Housing Casting less Condenser and Projector Lens and Bearing ROAS EE P 90 29X84 Bearing Rod for Above Casting 20 19X69 0 Horseshoe Washer Used on Aboye RO sissscsssce goninmanea dz 25 TIX TI aeir Condenser Lens Lens nearest Dial Cen EE KE 28X128 Lens Retaining Spring 20 12X72 Projector Lens 2 00 29X77 Focusing Lever Asembly 20 TASS Lamp Housing and Socket 55 26A81 Plug Assembly for Dial Lamp withWire less Dial Lamp and Housing 55 82X85 Projector Compartment KE 61 8294 00000 Dial Lamp Mazda No gin 15
8. Housing Bracket Lamp Contact Plug Lens Housing Lens Housing Bracket Color Filter Projector Com partment Elevator and Link Assem 33 00 KI d E sieis Front Support Bracket for Gang Con denser complete with two Pulleys and BESS ss AE Eege 1 65 Regie ege Rubber Cushion Mounted on above Bracket 2 ccccsccsccccsesssneeee 20 SOL eeh Stud used with Rubber Grommet 6X8 on Front Support Bracket for Gang Condensor arssrmericrsins 20 BGT EE Drive Drum for Gang Condenser 90 BEM OS EREA Support Bracket for Lens Housing Projector Compartment and Ele VALOR LGV ER see ege ees 1 65 25A198 Elevator Lever Arm and Bakelite Link Assembly crecer Kb ER EEN Lever Bearing Dog 20 GC Horseshoe Washers for Above Rod dz 15 Lever Arm Short Fastened to Band Switch Shaft 00 KE KT E Hairpin Spring Used on Above Lever 0 ceeeeeees dz 15 28X18 6 igieerg Tension Spring for Elevator Lever 08 POR SDs Support Bracket for Film Drum Shaft and Pulley 90 26Ag0n Film Drum Pulley Assembly 40 26X253 Shaft tor Film Drum accccicecsecsssssccsceaess 25 25A196 Tension Arm Assembly for Film Drum Cable less Tension Spring 35 PA DE een Guide Pulley only for Above Arm and for Front Support Bracket on Gang Condenser oeren 20 VED E E RP Spring only for Tension Arm 05 Bee deen Rubber Grommet Small for Mounting Rear of Gang Condenser to Film Drum Support
9. IFICATIONS Broadcast Tuning Range 530 K C to 1740 K C Intermediate Tun Range 1720 K C to 5950 K C Short Wave Tun Range 5850 K C to 18 500 K C Intermediate Freogencnx 456 K C Power Consnmmtion eeens 110 Watts Power Outpibecccsicecsncsosrindoorsmalcciseaaasdaviseds 10 Watts D C RESISTANCE OF WINDINGS Ti Broadcast Antenna amp Pre Selector Transformer B C Primary 19 ohms Pre Selector Secondary 3 2 ohms Secondary 3 ohms T2 H F and Intermediate Antenna Transformer Int Primary 73 ohms H F Primary 6 ohms Secondary 55 ohms Secondary 04 ohms T3 Oscillator Transformer Three Bands B C Primary 2 1 ohms Secondary 5 1 ohms Int Primary 1 2 ohms Secondary 1 1 ohms H F Primary 84 ohms Secondary 05 ohms T4 ist I F Transformer Primary 14 ohms Secondary 14 ohms T5 2nd I F Transformer Primary 13 ohms Secondary Start to tap 2 3 ohms Finish to tap 14 ohms T6 Output Transformer Primary 196 ohms per half Voice Coil 27 ohms T7 Power Transformer 25 Cycle Primary 3 4 ohms H T Sec 132 ohms per half T7 Power Tranformer 60 Cycle Primary 2 5 ohms H T Sec 97 ohms per half L2 Field Coil 900 ohms SETTING BUTTON TOUCH TUNING BUTTON 1ST SHORT WAVE AMBER STANDARD WAVE TONE CONTROL 2ND SHORT WAVE TOUCH TUNING BUTTON ELECTRIC IS MANUAL ON OFF SWITCH AND VOLUME CONTROL MANUAL TUNING KNOB Fig
10. Image too Small Blurred Fig 5 FEffect of lens focus ALIGNMENT AND CALIBRATION These receivers are carefully aligned and cali brated at the factory with precision instruments It is very important that all other causes of faulty operation be investigated before attempting to re align the receiver The equipment necessary for this consists of two essential items namely 1 A signal generator to supply with accur acy the frequencies a 456 K C b 1500 K C c 600 K C d 15 M C e 5 M C 2 A dependable output meter When aligning never use more R F signal than is required to produce half scale deflection on the output meter The lower the R F input the greater the accuracy of alignment I F ALIGNMENT Set the signal generator to 456 K C and con nect the output to the grid cap of the 6A7 tube through a 1 Mfd condenser The generator ground is connected to the chassis which must be extern ally grounded The receiver dial is set at maxi mum frequency gang open the selector switch turned to the broadcast band position and the vol ume control turned full on The I F trimmers located as shown on the chassis layout chart are then adjusted by means of a non metallic screw driver until maximum ontput is obtained The ist I F sensitivity is 40 microvolts and the 2nd 3000 microvolts R F ALIGNMENT Broadcast Band 1500 K C Set the signal generator to 1500 K C and connect the output
11. SERVICE MANUAL amp PARTS LIST novorts Series TME103 E 25 cele Only AZME103 E 60 crete ony MOVIE DIAL RADIO WITH THE NEW ELECTRIC TOUCH CONTROL 10 Tube A C Operated Superheterodyne Receiver Three Tuning Bands AND AUTOMATIC VOLUME CONTROL AN ALL CANADIAN PRODUCT MANUFACTURED BY Dominion Electrohome Industries Limited KITCHENER ONTARIO CANADA S10 SISOL OM S JO WOTJIUNf Y WOAY G r St ABGuOA OAV Out 0 JO peU apoyo LHY out oi P P UUO D st g9 aossoaddus Lan out Z SOTIOS UT PIPIJUUOID S1LOJSISOA WYO 00000 OM Aq poovldoa St pry g punoasd punods 0 US LYY OY WOAJ poyouUOd st GY T AUV STAGOW UALWL NO SHYNVHO vi ZE doo pk VOO SED E AOOD PAW ZO ES JOAL AOOD PFW EO FED DI LIFTS LIH ADOS PFW G ED TSP MORL NOOP PFW ZO ED PEMP IL ACOD PIM JOO ED LIZZ ASI ASZ PAW F TI WHSHLOOL Hb PAA DIDOO 83 r NOOk PAW EO Tt SE y Avaoudav E6 a ssva KE ie e E C Lat EES agnowday ININA we DR EE rg S Ke SE S nod TOIT OS TA SOTLL ONG ZE OT IHL O SITE ROLLEI LIN OK vavNnv gt WANINILI EE S UIW PIH 1000 ZIM PEW 1000 anm R eae ener A OOZ PWT _ WILT S FHI DO ZS ILIM OKILPW OS S3IULSNGNI 3WOHOULISIT NOIMIWOd oo LES OLE ILII YOLIF ISS ZE S PHM GELEI a H r E NIE PINZO Z et een A EE TEN VAP
12. SHLOAL GHW PFW 20000 ON L d SAHOLIMS FIFIN NOP PAW GE IO MGIL ACO PJM SZ ONIGNIM A0 HSINId SALVNDISA d 2A MINL AOO PJ WEO ONIGNIM AO LAVIS SALVNDISA 8 ALIBV10d ONIGNIM Z E OOP PJW SE SIMWWIAL AI PIWAN SP OLSI FITTI OPXIS IWS PW EOO A8 auva SHONVHO oN SS PE Fee Ee z SEET LAT PINN OGZ ZOD Q722 FIVOFIE Z7 74 SITS DO JWW SL OLG NS DE EE j SS AZ SSE El 77 on WHODFW7 IEN Lei CEA EZA DER e TAINO FECTIWL NO OFS s R EE e e EEN l S E ee e d Di e R re Mol WHOOFW E DOS SFWNISL SY Py Wi OF OLE 89 j AOIL OIII TA SOLIS OFS AL SSo SNAIL IZMO Z WMG re OS7 WIASHLOOL each PIN SG to NET ASSO E LMALIION DL Y ANE r OST DGIO NOE PAW T1935 l i ZSS SNIL STONE SZ EE M1 WO Se S Z E Oe YW GOT 53 AZ SSE SNE z Sp W WF OOOO EE NZ KE SR HOD ISO SH LMT DA EL COTE DOE OR GIWMSL SS PHWW OF OLE E awa ZSSR WOLLIN E EE EAR i ARSSO PIS JIA INE SG 7L Zi _ v O00 O07 ON L d s109 SaoLsisaa ON LJV SAASNAANOD i ELF SISHI OL J OFSISYIW STDELION 777 Wa E BCHFT ONI NONWO A TATO al COIL HIS COPED KOLLOID IH VEIT DH OOS S OL DWOESS OEF ADNFIOFAS HOH DVWOSES OL SH OFZ ONGO FLAOIW IFLA 7 DWV ORL7 OL
13. andling the electric drive panel do not carry it by the switch lever which actuates the ON OFF switch This bar may be bent and dam aged by such handling MOTOR AND SILENCER SPRING ASSEMBLY The electric motor supplies the mechanical power for tuning in a station when a touch tuning button is depressed A reversible A C motor is used Power is transmitted to the rotating mech anism by means of a pinion gear on the armature shaft which meshes with the first gear in the train of gears At the front of the motor is an assembly known as the silencer spring assembly This assembly has a two fold purpose First it establishes a contact while the motor is operating which completes a circuit to the chassis ground that silences the radio This switch S6 and circuit is shown in the sche matic diagram Its second function is to exert a slight amount of spring tension on the end of the armature shaft which extends from the motor The small pinion gear inside the motor rotates freely on the front motor bearing This pinion is always in mesh with first gear in the train of gears There are two pins on the armature and two extensions on this pinion The entire arma ture shaft assembly slides back and forth in its bearings When the circuit through the motor is complete magnetic action causes the armature shaft to slide toward the front of the panel The force is strong ELECTRIC DRIVE PANEL ASSEMBLY Continued enough to overcome th
14. ch in the rectangular spring retainer at back POSITION of the tuning plunger at AFTER TURNING housing located as shown in the accompanying eile illustration Then turn IL the spring retainer to NOTGH the position shown by REMOVE the dotted lines with POSITION PLUNGER the notch at the upper BEFORE left corner of the hous TURNING SPRING ing When this is done the spring in the hous ing will spring out The DAN plunger may then be HOUSING pushed out from the Tuning Plunger panel Spring Retaimer To replace the plunger push it into the housing from the back at the same time moving the clutch release lever slowly toward the manual position until the plunger slides all the way into place Replace the spring in the plunger housing de pressing it and at the same time moving the spring retainer into position to hold the spring in place Hook the stop lever spring to the back of the plunger Insert the smooth end of the new stop pin in the hole in the front of the shaft forcing it in by squeezing with pliers CAUTION Leave about 1 16 of the pin extending above the surface of the plunger Replace the electric drive panel on the chassis PARTS AND PRICE LIST SERIES 7ME1038 E A7ME103 E Part No Description A 489 Round Rubber Chassis Bumper A 533 salt Knob Washer scares A 622 Insulating Switch Cover B 909 Reversing Switch Cover Paes B 9O Teeraa A C Switch COVER egen
15. ctor As sembly Tuning and Setting Buttons and Glass Screen amp Screen Clamps On Request DRA DAT Ae 25 cycle Electric Drive Panel complete same as above except with 25 cycle Motor amp No 1 Gear Assembly On Request Ue BEE Lockie Plate senharers ieont inne aeonene 28X139 Spring for Locking Plate 37X93 _Interlocking Lever 37X954 Clutch Release Lever ccceeeeeeeeeee 28X137 Spring used for Above Lever Tuning Knob Shaft Yoke for Clutch Lever Fits Groove on Above Shaft Keyway Washer Used on Clutch Bearing Pulley for Manual Drive Belt On Back of Tuning Shaft Roller Bearing for Above Pulley dz Clutch Plate Clutch Release Spring In Front of Clutch Plate from Back of Panel dz 26X259 DE E EE Manual Drive Belt ce eee 26A74 Belt Tension Pulley amp Bracket Assem 28X150 Spring for Above Assembly pr 24X316 Belt Idler Pulley only 25A178 Setting Disc Assembly 28X134 Tension Spring Fastened to Auxiliary and Drum Release Levers pr 28X151 Tension Spring for Pawl of Setting ARTE pr 26X255 Setting Disc Shaft cc ccs ctsieatepsaiencess 20X192 Ball Bearings in Retainer For Setting BATTER 20X207 Bearing Cone Without Set Screw On Setting Dise Shaft 000 20X195 Bearing Cone With Set Screw On Setting Disc Shaft 0 0000 KEREN P
16. e erte eren B 23 EE Tube Shield Base B 231 Tube Shield Sieg C 336 Dial Escutcheon C 210 Small Grid Clip C 104 barge Grid Clips cscsigvevssewes sodeoswesieas Goes C 333 Square Zine Coil Shield 5 x 2 C 319A Square Zine Coil Shield 4 x n C 270 Square Zine I F Coil Shield 4 Mfd 25 volt Tubular Electrolytic 13 5 Mmfd Bi metallic Condenser 50 Mmfd Toothpick Condenser 75 Mmfd Toothpick Condenser 60 Mmfd Toothpick Condenser ve 3870 Mmfd Toothpick Condenser Canadian Call Letter Sheet Disc American Call Letter Sheets Disc 5 sheets to set Package containing 25 58x184 Celluloid Discs Four Prong Tube Socket Six Prong Tube Socket Seven Prong Tube Socket So Hight Prong Tube Gocket Rubber A C Line Cord with Plug Indicator Cable and Socket ate Fuse Receptacle 5 Ampere Fuse Antenna and Ground Terminal Strip Power Trans Assembly 60 cycle Power Trans Coil only 60 cycle List Price Ea D I 03 10 20 20 03 20 2 30 02 02 20 120 11 00 5 00 Part No V 149 Description List Price Ea Power Trans Assembly 25 cycle 17 00 Power Trans Coil only 25 cycle 6 60 Indicator Tube Mounting Bracket ER Wooden Knob Plain 3 used 25 Wooden Knob with B F P l
17. e tendency of the silencer switch spring to prevent this movement The pinion gear comes into close proximity with the armature and the two pins and two extensions mentioned above engage causing this gear to ro tate with the armature The electric tuning mech anism turns as a result When the circuit through the motor is broken the magnetic pull of the ar mature is released and the silencer spring forces the armature toward the back of the panel caus ing the pinion gear to disengage from the arma ture proper The tension of the silencer spring is of great importance If the tension is insufficient it will not push back the armature shaft after the cir cuit is broken and the inertia of the motor will continue to exert a driving force on the train of gears This will cause the tuning mechanism to go somewhat past the station after the setting disc has arrived at the ston position The remedy is to tighten the spring by bending it If the tension of the silencer spring is too great it will prevent the armature from moving forward when the circuit is completed and engaging the pinion gear When this occurs the pinion will not turn at all or a chattering caused by the armature pins and pinion extensions will be heard The remedy of course is to reduce the tension of the spring by bending The contact and the spring of this assembly must close while the armature is in its operating posi tion otherwise the radio will not be silen
18. ettering T WBE enee Edge KE B C Pre Selector Coil AssembDly 3 90 KE Intermediate and H F Antenna Coil Assembly ENKEN 2 80 B C Intermediate and H F Oscillator Coil Assembly 3 90 1st I F Transformer Assembly 8 70 2nd I F Transformer Assembly 3 30 Phono Jack Soeitch ek 1 10 Selector Seite sccsacccissscsisnecsverevaense 2 15 Volume Control with Switch 1 30 PLONE eeh TEE 1 00 2 2 to 20 Mmfd Dual R F Trimmer 85 2 5 to 45 Mmfd Dual Oscill Trimmer 80 draers iiia 003 Mfd Semi fixed Dadder 55 1250 Mmfd Semi fixed Padder ER 15 to 45 Mmfd Dual I F Trimmer A BE Areen 40 to 120 Mmfd Single B C Padder on Dual Base e 50 EAA 1 8 to 12 Mmfd Air Tuning Trimmer 30 SPEAKER AND SPEAKER PARTS E4 12 Dynamic Speaker with Output Transformer oe 16 80 Rubber Grommet ainan 02 Six Prong Speaker Plug 10 Speaker Field Coil 0 00000000 3 55 Output Transformer Assembly 3 00 Output Transformer Coil oni 1 50 Cone and Voice Coil Assembly for P 245 Speaker PARTS AND PRICE LIST Continued Part No Description ELECTRIC DRIVE PANEL ASSEMBLY List Price Ea IRAT TB EE 60 cycle Hlectric Drive Panel complete includes Main Castings Gears Pulieys Switches Motor Setting Discs Tuning and Setting Button Plungers and Tone and Volume Indicators less Gang Con denser and Movie Dial Proje
19. h to intermediate band the receiver dial to 5 M C and the volume control full on Adjust the intermediate oscillator trimming condenser shown on the chassis layout chart until a signal is heard Note There may be two signals present Use the one obtained by the minimum capacity setting and adjust the trimming condenser to the peak of the signal Then adjust the intermediate antenna trim ming condenser for maximum output Short Wave Band 15 M C The same procedure is employed as out lined for the intermediate band only of course the oscillator and antenna trimming condensers are adjusted at 15 M C The high frequency sensitivity is as follows 10 microvolts at 5 M C 12 microvolts at 2 M C 10 microvolts at 15 M C 15 microvolts at 6 M C ELECTRIC DRIVE PANEL ASSEMBLY TO REMOVE ELECTRIC DRIVE PANEL FROM CHASSIS Remove the chassis from the cabinet using ex treme care not to damage the setting button shafts Remove the touch tuning buttons by push ing down the lower end of the small hairpin spring at the back of the button and at the same time pulling the button off the shaft It is not neces sary to remove the setting buttons To remove the panel from the chassis turn the electric manual lever to the electric position Unsolder the wire on the silencer switch on the front panel and also the motor connections under the chassis Take off the collars from the volume and tone control shafts Remove the
20. reached Check the tuning by pushing in one of the other touch tuning buttons After the motor stops again push in the above mentioned touch tuning button which was set for a station and see whether this station is correctly tuned in Punch the correct station disc from the sheets sup plied and push this disc into the bottom of the button which is depressed It should be so placed that the letters will be horizontal Push one of the clear cellu loid discs into the button over the station disc Proceed in the same way to set the remaining touch tuning buttons PROCEDURE FOR SETTING THE TOUCH TUNING BUTTONS Continued Never attempt to push in a setting button unless the touch tuning button directly beneath it has first been pushed in and the motor has stopped If a button which is set for one station is changed to another station remove the clear celluloid dise and the station call letter disc with the point of a pin The celluloid disc has a notch on the edge for this purpose Then insert the new call letter card and the clear cel luloid disc TUNING IN A STATION WITH A TOUCH TUNING BUTTON Turn the electric manual lever to the electric posi tion Push the touch tuning button containing the call letters of the desired station all the way in The but ton will remain depressed After the station has been tuned in by means of the electric mechanism the vol ume control may be adjusted if necessary Push in only one touch
21. t be tween stations Be sure that the assembly is not so bent that the contact and spring remain per manently in contact This condition would of course short out all signals REPLACING A SETTING BUTTON PLUNGER It is advisable to remove the electric drive panel from the chassis and mount it in a vertical posi tion by means of clamps or a vise Turn the clutch release lever to the manual position Remove the two sections of the switch lever the center section and the section at the rear of the plunger to be replaced Move the rocker arm shaft to the right or left as necessary to allow the stop lever and rocker arm above the setting button plunger to be taken off from the rocker arm shaft After these are re moved the setting button plunger may be pushed out from the front of the panel Replace the new plunger from the back of the panel and reassemble rocker arm and stop lever to the rocker arm shaft Reassemble switch lever and replace the electric drive panel on the chassis REPLACING A TOUCH TUNING BUTTON PLUNGER Remove the electric drive panel from the chassis and mount it in a vertical position by means of clamps or a vise Turn the clutch release lever to the electric position Remove the pin from the front of the button plunger by pulling it out If this cannot be done file the pin flush with the plunger Unhook the stop lever spring from the back end of the button File a V shaped not
22. tuning button at a time If two buttons have accidentally been pushed in push in any other button to release them or turn the electric manual lever to the manual position MOVIE DIAL ADJUSTMENTS Fig 3 Lamp height adjustment and focusing lever BRINGING LENS ADJUSTMENT TO A FOCUS IMPORTANT Turn the Band Selector switch to the broadcast position Move the focusing lever Fig 3 up or down until the image on the screen is clearest In Fig 5is shown the effect of correct and incorrect focusing REPLACING AND POSITIONING THE DIAL LAMP CAUTION If a new lamp is required use only a No 81 lamp Order by Part No K 695 Turn the radio off and turn the Band Selector Switch to the Broadcast position Image too Large Blurred Image in Focus KFEQ_WMAQ Lamp Housing too Low KFEQ WMAQ Lamp Housing too High Fig 4 Effect of lamp housing assembly height Remove the lamp housing by unscrewing and re moving the two screws which hold this housing in place See Fig 3 Remove the old lamp from the socket and put in the new one Replace the lamp housing by means of the two screws but do not tighten these screws yet Turn the radio on Then grasp the top of the lamp housing assembly and move it up or down until the image on the screen is clearest and the lines are horizontal The effect of having the lamp housing too high or too low is shown in Fig 4 Tighten the two screws
23. ube also when on the broadcast or in termediate bands A 6G5 tuning indicator tube is used the func tion of which is to give a visual indication of the amount of automatic volume control voltage de veloped across the diode load network Since the AVC voltage is highest at resonance the 6G5 tube gives an accurate indication of tuning The power supply employs two 80 rectifier tubes each is connected to serve as a half wave rectifier and the combination used as a full wave rectifier The speaker field L2 900 ohms is used as a filter reactance in series with the B supply One self regulating electrolytic condenser C37 is used which in addition to filtering keeps the B supply at a nominal voltage when the receiver is first turned on thus protecting the component parts of the circuit from a high voltage surge Condensers C17 2 used C21 amp C28 connected across the I F coils permit the use of very low cap acity I F trimmers thus reducing the I F drift to an absolute minimum Frequency drift in the broadcast oscillator circuit is minimized by employing the low capacity padding condenser C11 shunted by the fixed condenser C10 CAUTION To protect the electric motor used for automatic drive in this receiver a fuse has been incorporated It is located on the side of the chassis This fuse is of the screw tyne and rated at 5 amperes Under no circumstances must it be removed while the receiver is connected to the 110
24. ulley for Drive Cable On Setting Dise Sbhafti EEN 25X408 Support Bracket for Setting Disc Shaft Left Side from Back JOKAL Z esans Support Bracket for Setting Disc Shaft and Motor On Off Bwitch E T Torere Adjusting and Supporting Rod for Motor On Off Switch a EE Motor On Off Switch Assem Complete 37X85 Switch Lever Right Sec from Back 37X96A Switch Lever Left Sec from Back 25X413A Switch Lever Center Section 28X137 Switch Lever Spring BTS A euepett Stop Lever ocene 28X148 Stop Lever Spring once dz 25A181 Rocker and Rocker Arm Stop Assem bly Complete with Spring SST s Spring for Rocker Arm Stop s 26X256H Rocker Arm GOhatt 26X261 Setting Button Plunger 10A114 Setting Button only oare 26X254 Tuning Button Plunger with Stop Pin DERVIS incest Tuning Plunger Spring ccccecsee dz 10A1138 00 Tuning Button only aisaen 28X129 Hairpin Spring for Tuning Buttons dz LOSS oiea Main Drive Cable complete with Ne EE RB TB EE 60 Cycle Motor Gompniete 24X296 Pinion Gear only On Motor Armature Shaft 60 Cycle accen RER eessen 25 Cycle Motor complete 0 0 25A2388 No 1 Pinion amp Gear Assem 60 cycle 25A248 No 1 Pinion amp Gear Assem 25 cycle DER BOT gd ox No 2 Gear and Pulley 0 00 00 0000 25A184A No 3 Gear Assembly 25A185
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