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Содержание 100

Страница 1: ...tion November 1926 RADIO CORPORATION OF AMERICA 326 Broadway New York City Prepared by NATIONAL SERVICE DIVISION 233 Broadway New York City DISTRICT SERVICE STATIONS 10 South La Salle Street Chicago I...

Страница 2: ...A has prepared a series eef Service Notes of which this booklet is a part containing technical information and practical helps in servicing Radiolas This information has been compiled from experience...

Страница 3: ...re overloaded by an abnormally strong signal being forced through the amplifiers distortion will follow If it is definitely established however that the distortion or rattle complained of is not due t...

Страница 4: ...Fig 1 Moving part of motor Fig la End view of motor Method of adjusting armature clearance...

Страница 5: ...irmly Figure 8 shows the method of tightening the upper screw with the spacers in place After the two screws have been tightened the spacer tools should be removed and the Loudspeaker tested If the ra...

Страница 6: ...otor in place These screws thread into the spacer bushings E 7 Place a piece of iron on the ends of the horseshoe magnet and slide the motor off The piece of iron takes the place of the motor and acts...

Страница 7: ...ghtly and when the spacer tools are removed the strain causes the armature to spring out of the central position Remove the spacer tools and note care fully whether or not the armature is centered bet...

Страница 8: ...e cone 1 Remove the small nut that holds the cone to the connecting rod 2 Remove the four screws a b c and d shown in Figure 13 When these screws are removed the entire aluminum frame may be removed f...

Страница 9: ...upports and lay the casing on them in a horizontal position 10 Allow the aluminum frame to rest on the four cleats O Figure 13 on the front edge of the casing 11 Center the frame in the center of the...

Страница 10: ...Fig 14 Cylindrical filter type lo Fig 15 Square filter type...

Страница 11: ...t points are shown in capital letters in the circuit diagram and illustrations Figs 14 15 and 16 Before starting the click test disconnect terminal D from the binding post at B This free terminal D wi...

Страница 12: ......

Страница 13: ...100A RADIO CORPORATION OF AMERICA Prepared by Service Division of the Production and Service Department 233 Broadway New York City 326 Broadway New York City DISTRICT SERVICE STATIONS 1412 Monroe Stre...

Страница 14: ...the RCA has prepared a series of Service Notes of which this booklet is a part containing technical information and practical helps in servicing RCA Loudspeakers and Radiolas This information has bee...

Страница 15: ...dspeaker Connections 10 Service Data Chart 15 PART II MAKING REPLACEMENTS Replacing Magnet Coils 11 Replacing Armature and Drive Pin 12 Replacing Thrust Lever and Driving Rod to Cone 13 Replacing Moto...

Страница 16: ...AGNET COILS THRUST LEVER SOFT SOLDER MAKE ADJUSTMENTS WITH SOLDERING IRON SILVER SOLDER DRIVE PIN DRIVING ROD CONE SEATING NUT CONE Figure 1 Diagram showing constructional details and operating princi...

Страница 17: ...s used in conjunction with receivers using plate voltages passing current in excess of 10 milliamperes some method of coupling the out put of the receiver to the Loudspeaker should be employed A choke...

Страница 18: ...If a signal of good quality and volume is being delivered by the receiver the loudspeaker will have to be examined for the cause of any imperfect repro duction that may occur 2 PROCEDURE TO REMOVE HO...

Страница 19: ...it may be necessary to adjust the armature to check on this condition In any case an adjustment of the armature is necessary To adjust the armature a set of spacer tools are necessary Figure 4 illust...

Страница 20: ...ly Poor reproduction is the result and inspection of the armature drive pin may indicate a slight torque or twist This is most likely to occur when replacing a cone The new cone should be carefully se...

Страница 21: ...will cause distortion Defective magnet coils will also cause imperfect reproduction The circuit and correct connections are shown in Figure 8 The reference letters in the circuit diagram refer to the...

Страница 22: ...roduction As there is not much wear and tear on the coil connections the most likely place to find trouble of this nature is in the connecting cord The point where the cord enters the loudspeaker hous...

Страница 23: ...otor mechanism with supporting screws S T V and bush ings X Z Figure 9 may now be removed from the supporting frame and separated by releasing the bushings X Z and removing the supporting screws S T V...

Страница 24: ...en cone lock nut and seal with seal ing wax Seat screws around edge Place spacer tools in position to adjust the armature as indicated in Fig ure 5 and tighten screws A and B Resolder drive pin to thr...

Страница 25: ...motor mechanism is replaced 4 REPLACING MOTOR ASSEMBLY COMPLETE When replacement of the complete motor mechanism is necessary remove mechan ism assembly from housing as described in Part I Sec 2 Then...

Страница 26: ...e the diagonal position of the cloth pattern as originally installed The reassembly is a reversal of the foregoing procedure Rear Grille To replace the rear grille the mechanism assembly and front gri...

Страница 27: ...er from ture action mechanism Sec 3 Weak Loose thrust lever mounting Tighten screw and resolder Reproduc tion screw drive pin Sec 6 Sec 3 Improperly aligned cone Align cone correctly Sec 5 Drive pin p...

Страница 28: ...Printe in L S A 1927...

Страница 29: ...right October 1928 Radio Corporation of America SERVICE DIVISION OF THE PRODUCTION AND SERVICE DEPARTMENT 233 BROADWAY NEW YORK CITY DISTRICT SERVICE STATIONS BROOKLYN N Y CHICAGO ILL SAN FRANCISCO CA...

Страница 30: ...of the RCA has prepared a series of Service Notes containing technical information and practical helps in servicing RCA Loudspeakers and Radiolas This information has been compiled from experience wi...

Страница 31: ...Service Data Chart 15 PART II MAKING REPLACEMENTS Replacing Magnet Coils 11 Replacing Armature and Drive Pin 13 Replacing the Thrust Lever and Driving Rod 13 Replacing the Motor Assembly Complete 14...

Страница 32: ...AFFLE METAL MOUNTING FRAME _ METAL MOTOR SUPPORT nr art a THRUST LEVER 4 WITH MAGNET DRIVING ROD ARMATURE WITH 4 DRIVE PIN t MOTOR MECHANISM FILTER ftrkR INPUT CORD n iKtri 1 ra4 Y Figure 1 Rearview s...

Страница 33: ...tied over this frame to give an artistic finish and provide easy access to the mechanism when necessary Some method of coupling the output of the receiver to the loudspeaker should be employed when L...

Страница 34: ...for the cause of any imperfect reproduction that may occur INNER EDGE DRAW STRING OUTER EDGE DRAW STRING Figure 4 Location of draw strings used to fasten silk cover over canopy 2 PROCEDURE FOR REMOVIN...

Страница 35: ...e Division Stock No 2321 The material obtainable on the open market should be phosphor bronze strip 010 thick and 25 wide It is bent as illustrated and soldered to hold the ends fairly rigid The two e...

Страница 36: ...ge of the cone 23 m o rer o I Figure 6 General appearance and correct dimensions of armature spacing tools can now be lined up with those of the metal frame and the outside frame lightly attached with...

Страница 37: ...n the coils or in the filter unit A pair of headphones and a 41 2 volt battery connected together in series or a voltmeter and sufficient battery to give a full scale deflection should be used ARMATUR...

Страница 38: ...nuity of the leads and also for a short between the leads Shake the cord while conducting the continuity test to disclose any breaks which will be indicated by interrupted clicks Figure 8 Drive pin th...

Страница 39: ...frequencies can be indicated to run such a test A test of this kind is quite conclusivefor quality and volume of reproduction and will indicate if further repair work or adjustments are necessary Figu...

Страница 40: ...occupied by the old ones 11111 11111 LOUDSPEAKER COILS Figure 10 Schematic circuit of Loudspeaker 103 coils and filter and photo of filter unit b Reassemble the motor mechanism and replace the thrust...

Страница 41: ...Removing reproducer assembly from baffle 3 REPLACING THE THRUST LEVER AND DRIVING ROD Ordinarily the driving rod and thrust lever are not likely to become damaged or require replacement However shoul...

Страница 42: ...nd magnet and install the new motor The reassembly will be a reversal of the foregoing procedure 5 REPLACING CONE When replacing a cone re move the old one as described in Part II Section 1 The in sta...

Страница 43: ...tapestry proceed in the following manner a b c d e f The Remove the mechanism by removing the six machine screws that hold it to the baffle board and remove the baffle board by removing the eight woo...

Страница 44: ...se thrust lever mounting screw Improperly aligned cone Drive pin poorly soldered Weak magnet Examine receiver Part I Sec 1 Remove foreign matter from mechanism Part I Sec 3 Tighten screw and resolder...

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