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Bell and Howell Academy, Commercial, Utility Owner's Manual 12 Pages
Bell and Howell Academy, Commercial, Utility Owner's Manual
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FINE FILMS to run in your FINE PROJECTOR Assure vourself the maximum use вый, pla - ure of your Filmo or Filmosound Projector hy regular patronage of the Bell & Howell NELLA HIRE LE, FILMOSOUND LIBRARY Your choice of several thousand of the finest 16mm. films, sound or silent, color or black-and-white, at very moderate rental rates, Hollywood feature films that bring all the bright stars of the movie world right into your own home or social group, hundreds of entertaining “shorts, too—comedies, musicals, travel talks, newsreels, cartoons—many in color, All filma are selected for their high quality and suitability to nonstheatrical audiences, Educa- tional films by the hundreds, and church films, too, Getting films from us is as convenient as rent- ing a new book from the public library, SINGLE +“ a FOR EVERY FILM SERVICE You may pick your own shows direct from our cata- log, or our expert bookers will help you select the best pictures Er every occasion, There is no extra charge for our library's many “plus” services. Filmosound Library prints are kept in prime con- dition, service is rapid and efficient. You pay only for the date on which films are used, there is no charge for time in transit. Patrons enjoy important free services alsa; for ex- ample, interesting industrial and other “‘spon- sored'' films are sent free, on request, with rental programs. In building up a private Lbrary of professionally produced films, you have hundreds of our releases to pick from—and we credit rentals (paid) on any film bought within 30 days of playdate. The Bell & Howell Company is the only equip- ment manufacturer that cares for its patrons needs right ta the Anal point—the picture on the screen. Only Bell & Howell operates a sae eg film library. We offer you one single, comprehen- sive source that meets every film need. SEND FOR FILM CATALOGS TODAY Special sections, handsomely illustrated, on edu- cational, recreational ancl religious films, Please specify zekich interests you. There 15 no oblirañion, BELL & HOWELL COMPANY 1801-15 Larchmont Avenue, Chicago ‘New York—30 Rockefeller Plaza + Washington, D.C.—1221 © Street, NW, HMallvwood716 М. LuBrea Ave. London—14 Great Castle Form 15.350 Г.Т. аира 63 Printee 1H М. В. A. ee % - Г F ar OWNER'S MANUAL = or OPERATION aoe MAINTENANCE a B ELL & HOW ELL E “COMMERCIAL,” “ACADEMY” and “UTILITY” MODELS a o.» ] = ers Te TO Rd. Da ano ai A И as oe Е T г TR A ее Ae ds №. rs ea gil = Ben A a 16 mm. Sound-on-Film Projectors PROFESSIONAL RESULTS WITH a AMATEUR. EASE IMPORTANT Be sure to fill in and mail the accompanying registration card. This will: t. Bring you “Filmo Topics,” an interesting and informative periodical on personal movie making. 2, Give you the protection of the B&H guar- antee, Your guarantee and service certificate will be sent to you upon receipt of the card. 3, Entitle you to a free cleaning and lubricat- ing service at the end of the first year. 4, Let us help you find your equipment in case of loss or theft. 5. Enable our Personal Service department to cooperate with you intelligently. | Contents Page General Information........... 1 Setting Up For Use.......---..- 2-7 Adjusting Projector to screen..... 4 Cautions before proceeding.,..... 3 Electrical connections,..,....... 3 Preparing to operate Filmosound “Commercial”. .............. 2 Preparing to operate Filmosound “Academy” and “Utility”, .... 2 Threading the film.............- 5-7 Operation. ...........:,:...... 8-11 Framing....................... 8 Important warning... .... не, 11 Micraphone................... 9 Monitor speaker. ............... 19 Operating on 25-cycle 115-volt A.C. 11 Operating on 50- 60-cycle, 220- volt AC, .,..,.,,4.444,,. 10 Operating оп 115-volt D.C....,.. 10 Operating on 220-volt D.C... .... 11 Operating on 220-volt or 110-volt D.C...............,.,,,,,..: 11 Phonograph turntables......... 9 Projecting...,.,................ 8 Projecting silent film.......-..-.. 8 Reversing.......,,............ 8 Rewinding........,,.,......... 8 Sound volume....,,,.,,.....,.... 9 Still picture projection..,..,,,,.. 8 Pape Tone contral................,,, 9 Using two spcakers with Filmo- sound ‘‘Utility”.,,,,......... 10 Pilot Light. .................. 10-18 Projection Defects and Causes, 12-15 Check list. ........,.....,..,.. 15 Correct tubes for Filmosound Amplifier. ..,................ 15 Emergency Trouble Guide, .... 12, 13 Extra equipment..........,,,.. 15 Projected Picture Sizes Obtained with Filmo Projection Lenses... 15 Removing Amplifier from projector 13 Removing Amplifier from the blimp case, .,,,,.,,,,,..,,,,. 13 Replacement tubes........ 0.0... 15 Special Filmosound models....... 15 Suggestions for presenting an effec- tive show. ......,.,.......... 15 Tube testing. ,....,..,,,.,.... 14 Care and Maintenance of Filmosound..............,, 16-18 Cleaning film handling parts..... 16 Cleaning optical parts......... 16 Exciter Jamp replacement........ 17 Fuse replacement, +... ooo... 17 Projector lamp replacement...... 18 Projector lubrication........... . 17 Reflector, Adjustment of.......,. 18 BELL & HOWELL COMPANY 1801-15 Larchmont Avenue, Chicago New York - - - = = - - - - Hollywood - - - - - - - - - Washington, D. €, - - - - London ---------- - - 30 Rockefeller Plaza - - 716 М. LaBrea Ave. - - - 1221 С Street N. W. - - - - 14 Great Castle Instructions for Operating the BELL & HOWELL FILMOSOUNDS “Commercial,” “Academy,” and “Utility” Models General Information INCE this instruction manual applies to three distinct models, select those instructions which apply to your projector. Threading, amplifier operation, converter connection, rewinding, and most other features are common to all models, Since each of the models has its own distinctive features, the reader should familiarize himself with these features in order to understand fully his projector. The Filmosound *Commercial””—A Single Case Model Section / Setting Up For Use ge Preparing to Operate the Filmosound “Commercial” Having removed the projector [rom its compartment in the carrying case, at- tach the reel arm as shown in Figure 1. The take-up assembly should be toward the rear of the projector, O, Figure 2. Figure J—Filmosound “Utility” М. Take-up reel WN. Feed reel The “Commercial” model is not equip- ped with either a still picture clutch or reverse mechanism, nor is it regularly supplied with the Magnilite condenser, later mentioned in connection with the “Utility” model. It operates at sound speed only, Its chief distinguishing characteristic is that the projector is not provided with the usual blimp case, making it lighter and more readily portable. It is sup- plied with a single long arm containing both the feed reel mounting spindle and the take-up assembly. See Figure 1. Figure 1 Filmosound “Academy”—A Two Case Model This projector, similar in most respects to the “Commercial” model, is equip- ped with a blimp case for the projector and a separate feed reel arm and take- up reel arm. Ц also has a selector switch to change from sound to silent speed, Filmosound “Utility” —A Two Case Model While the projector mechanism is iden- tical to that of the “Commercial” and “Academy” models, the Filmosound “Utility” is equipped with a still pic- ture clutch and a reverse switch, per- mitting the film to be run forward or backward without re-threading. It is factory equipped with the faster 2-inch Е 1.6 lens as well as the light-increasing Magnilite Condenser. The speaker, a 12-inch heavy-duty unit, permits the attachment of an auxiliary speaker, an accessory not available for the “Commercial” and “Academy” models. Figure 2 O. Take-up assembly P. Take-up drive pulley O. Take-up pulley R. Heel arm screw The reel arm is attached in this position by means of the thumb screw, R, Fig. 2. Loop the spring belt, without a twist, from the drive pulley P, Figure 2, at the rear of the projector motor to the take- up pulley O, Figure 2, at the rear of the reel arm. Since the absence of the blimp case anc the necessary difference in reel arms are the опр’ operating variations between the “Commercial” Filmosound and the ‚other models described in this manual, the ensuing operating procedures, apply to all three models. Preparing to Operate “Acade- my” and “Utility” Models The removable reel arms for these models are carried inside the door of the projector case, Attach the one marked “top” at the top front and the one marked “rear” at the upper rear of the projector case as shown in Figure 3. Both are fastened by thumb screws, accessible when the large door is opened. Instructions for Filmosounds “Commercial,” “Academy,” and “Utility” Loop the rear spring belt, without a twist, (rom the drive pulley P, Figure 4, P. Toke-up drive pulley Q. Take-up pulley at the rear of the projector motor, to the take-up pulley О at the end of the rear reel arm. On the “Ulity” model, loop the front belt, without a twist, over the | 1S VOLTS ] oe 0 a 5 EDED E cA ¿UA GE UL Pee TER RECTFTRÈLE F # CORD "A" 1 SY ATI AMPLE BoP PTACL Figure 5 Relative position of the units required for — Filmosound projection the speaker and the speaker cable ta the front of the room and place the speaker as nearly as possible at the center of the screen and above the floor, but not so lurch as to interfere with the small pulley at the top of the feed reel arm. Figure 5 shows the relative position of the units required for Filmosound pro- jection. И indicates as well, the elec- trical connections for operating on 115- volt 50- or 60-cycle alternating current, The same arrangement of components is used for the special Filmosound for 25- to 60-cycle 115-valt А.С. operation. For direct current and 220-v01t oprra- tion, see page 10, Cautions Before Proceeding Be sure that: 1. The line into which you are connect- ing your Filmosound is AC (alternating current), : 4. The voltage rating for your location is not higher than 125 volts. 3. The fase in the line is rated at least 10 amperes, provided no other equip- ment is on the same circuit. 4. If other devices are connected to the same circuit, the house fuses are re- placed by your spare plug type fuses of 20 ampere rating (these should be pro- cured locally and be carried with the Filmosound). 5. All controls on the Filmosound arc in “of” position. Electrical Connections After removing the grill cover and alí accessories from the speaker case, carry at least 18 inches in front ol any ob- structing surface. Connect the end of the speaker cable marked “speaker” in the receptacle at the rear of the speaker сазс. Uncoil the speaker cable as vou go to- ward the projector. Avoid placing the speaker cable where your audience might trip over it, Figure 6 WI. Speaker receptacle W2. Projector line receptacle WS. Amplifier line receptacle FU. 2-ampere fuse Insert the end of the speaker cable marked “projector” into receptacie Wi, Figure 6. Insert the plugson the twoshort branches of the Y” cord into the receptacles W2 picture, Locate the speaker. and Wi, Figure 6. Connect the attachment plug at the end af the “Y” line cord into a wall recep- tacle providing 115-volt 30- to 60-cycle alternating current. If the receptacle is more distant, add a 10-foot line exten- sion cord (supplied with the “Utility” model) to the end of the “Y” cord, then attach the extension cord to the power outlet. Adjusting the Projector to the Screen Turn on the projector switch, C1, Figure 7, and the lamp switch C2, Figure 7. On “Academy” and "Utility" models, the small case door, covering the projec- tion lens must, of course, be opened, Ifthe electrical connectioms are correctly made, the projector mechanism should now operate and a beam of light should be projected on the screen, provided that, on the “Utility”? model, the clutch control &, Figure 7, is turned to ex- treme clockwise position. Move the projector on its stand or table to such a position that the projected beam coincides with the screen. The projector is raised to the required height by turning the tilt adjustment knob Y, Figure 7, in a clockwise direction. The Figure Y L Lens LL. Lens locking acre yw tlt knob on “Academy” and “Utilicy” models is located within the lower door on the front of the projector case. After the vertical adjustment of the projector is completed, this lower door should be closed. If the projected image is larger than the screen, move the projector closer. If the image is too small, move the pro- jector farther from the screen. If room size limits the throw, select the correct lens, indicated in table on page 15. With the projector operating and the lamp turned on, loosen lens locking screw LL, Figure 8, by turning to the left, and slide the lens, L, forward or backward until the outlines of the aper- ture or frame are sharply defined. To further sharpen the focus, revolve the lens first in one direction then in the other. Now turn of the projector and turn on the amplifer switch C3, Figure 7. Allow about one minute for the tubes to heat, then move the film volume con- trol C4, Figure 7, in a clockwise direc- tion until a hiss is heard from the Figure 7 C1. Projector switch (2. Lamp switch C5. Amplifier switch C4. Film volume control (5. Tone control C6. Microphone volume control XA. Clutch control Y. Tilt adjustment knob 4. Exeiter lamp cover speaker. At the same time, light should be sten from behind the exciter lamp cover £, Figure 7. If the above conditions exist, the elec- trical connectionsare properly made and the Filmosound ts ready for threading. Threading the Film Place the Filmosound test reel, supplied with your projector, on the top reel arm spindle, and an empty “take-up” reel on the rear spindle. Press cach of these reels firmly on to the spindle until the small retaining spring-balls lock the réels on the spindles. Pull off about four feet of film for threading. The film, ifcorrectly wound, should feed from the front of the reel with the per- forated edge toward the operator. Un “Academy” and “Utility” models, slip the film into the slot at the base of the reel arm and between the two roll- ers. Lead film to the first sprocket. (On the “Commercial” film passes dir- ectly from feed reel to first sprocket.} J. Koller in front of first sprocket Sl. Safe-lock sprocket T1. Sprocket guard tab Lead the film above roller J, Figure 9, and below sprocket $1, Figure 9. Slide the гл as far toward the machine as it willgo, Holding the Alm snugly around the sprocket with the left hand and the right thumb, press on tab Ti, Figure 9, to open the guard. Pull gently on the film unul the perforations seat over the sprocket teeth, Then release tab T1, locking the film on the sprocket, Swing lever A, Figure 10, upward. (This lever is beyond the projection lens.) ‘This movement will open the film gate. Now form the first loop, following the loop outline on the side of the gear case, as shown in Figure 11. Figure 10 A. Gate lever B. Hand setting knob Figure 11 T2. Sprocket tab A. Gate Lever BE. Hand setting knob Pass the film through the channel be- hind the lens as in Figure 11, being certain that it is fully seated in this channel, Then close the gate by press- ing down lever A, Figure 10, as far as it will go. Form the second loop, con- forming to the outline on the gear case and slip the Glen over thesecond sprocket, 52, Figure 12. Again press the lm as far toward the projector as it will go, and while maintaining correctloopsize, lock the film on the sprocket as for 51. Now turn the hand setting knob B, Figure 10, several clockwise revolutions. This will engage the film with the shuttle tecth. Should the lower loop slide up- ward, merely insert a Anger in the loop and pull it down to the loop outline on the gear case. Again test the threading with the hand setting knob. Lead the film from the second sprocket 32, Figure 12, under the top roller of the Oscillatory Stabilizer, around the sound drum “D,” Figure 13, and over the third sprocket 53, Figure 14. Press the film as far toward the projector as it will go over the sprocket 53, and pull down on the film as it passes over this sprocket. When the Oscillatory Stabil- zer is moved to its extreme position by the tension on the film, open the film guard by pressing on tab T3, Figure 14, Then tree the film just sufficiently to permit the Oscillatory Stabilizer to pull it back to the first available set of per- forations. Release tab T3, permitting the guard to lock the film in place on the third sprocket. Pass the film under the snubber SN, and the roller K, Figure 15, and thence to the take-up reel. On “Academy” and “Colite models, the film must be in- serted in the slot in the case and between the rollers on its path to the take-up reel, The film should pass around the bottom of the take-up reel, Figure 16. Remove the slack before starting the projector by revolving the take-up reel clockwise. No special precautions need be observed ta synchronize the sound to the picture since adherence to the foregoing instruc- tions will assure correct synchronization. The mechanism on the rear reel arm is a combination take-up and rewind de- vice. Set this for take-up by pressing Figure 15 SN. Snubber К. Rear idler roller Figure 12 52, Second aprockel Figure 13 D. Sound drum Rl and Ki. Sta- bilizer rollers Figure 14 Hl and R2, Stabilizer rollers 53. Third aprocket TS. Sprocket tab Figure 16 M. Take-up reel Figure 17 O. Take-up pulley 01. Spindle pulley U. Take-up lock lever . Rewind gears lever U, Figure 17, while the reel is on the spindle. No adjustment or compensation is necessary for various reel sizes, since the flat fabric belt between pulleys Q and Q1, Figure 17, provide complete and automatic Compensation without any manual adjustment. The projector is now ready for operation. BEFORE PROJECTING, YOU MUST BE ABLE TO ANSWER 7: “YES” TO THE FOLLOWING QUESTIONS: 1. Have you read the preceding in- structions? 2. Have you cleaned the aperture and the optical components? (See page 16.) 3. Are all loops of the correct size? 4. Js the film properly engaged on all sprockets? 5. Is the film gate closed? 6. Is the film properly started on the take-up reel, with all slack removed? 7. Is the take-up rewind assembly set to take up film? 8. On the “Utility” model, is the di- rection switch set for forward operation? 9. Have you selected the correct speed for the film you are projecting (sound or silent)? 10, On the “Utility” model, is the clutch engaged? 11. Have you tested the threading by turning the hand setknob or by momen- tarily turning on the motor? 12. И projecting sound film, is the amplifier turned on? 13. If using a microphone with silent film, (a) is the amplifier turned on; (b) is the film volume control at its extreme low position? 14. Is the lamp switch turned on? 15. Have you learned from the en- suing pages of this manual, how to use a microphone and turntable; how to use the still picture clutch; the tone con- trol; how to rewind the film; and how to operate the “Utility” model in reverse? (After you have become adeptatthread- ing the film through the mechanism, turn on the amplifier before threading. This will allow the amplifier tubes to warm up to the proper operating tem- perature, so that sound projection can be started as soon as threading is com- pleted.) | Section 2 Operation Projecting With the amplifier tubes warmed and the film volume control about one- quarter on, start the projector, switch C1, Figure 7. As the title appears on the screen, care- fully revolve the lens first in one direc- tion then the other until the title or the first picture appears in sharp focus. Framing If the picture frame line shows on the screen, turn th® framer knob E, Figure 18, to make the frame line disappear. If framing moves the picture off the screen, readjust the tilt control Y, Figure 7. Projecting Silent Film To project silent film, thread the ma- chine in the usual way. Set the speed control switch (on “Academy” and “Utility” models) at “silent,” Do not turn on the amplifier unless oral com- ments are to be made through the speaker by means of a microphone, When so using the amplifier, be certain that the fm volume control is at its ex- treme minimum volume position. NOTE: The Filmosound “Commercial” is not equipped with a “silent” speed. Silent film may be projected, but it will be projected at 24 frames a second, somewhat faster than normal projection speed for silent film. Reversing (“Utility” Model Only) Turn the volume control until the sound is inaudible. Stop the film either by disengaging the clutch or by stopping the projector motor. When the mecha- nism has stopped, turn the direction switch to “reverse.” Before changing direction always stop the projector. The lamp may be on or off, as desired. Still Picture Projection (“Utility” Model Only) To project a still picture, the clutch control knob X, Figure 18, is revolved Figure 18 E. Framer control L. Lens LB. Lens barre! LL. Lens locking screw X. Clutch control to full counter clockwise position, thus disengaging the projector mechanism. If no picture appears on the sercen, the closed section of the shutter is obscuring the light. A smail movement of the handsetting knob B, Figure 10, will bring the open section of the shutter into correct position, thus permitting the projection of still pictures. It will be necessary to adjust the lens to focus a still picture. Re-focus, when motion is resumed. Rewinding The take-up reel, which has now re- ceived the entire film, should be removed from its spindle on the rear or take-up reel arm. The empty reel should be Figure 19 С. Main condenser CM. Magnilite condenser Z. Exciter lamp cover removed from the top ree! arm, and the two reels thus interchanged. ‘The reels will then appear as in Figure 19. The end of the film is led over the top of the empty reel as in Figure 19. “he lever U, Figure 17, is pressed forward, and the take-up reel lifted up as far as it will go to engage the two rewind gears V, Figure 17. Then, while still holding the reel in the lifted position, the pres- sure should be released from the lever, thus locking the assembly in the rewind position. Turn the projector switch on, allowing the motor to run until all of the film has been rewound on the original reel, Immediately after rewinding, and be- fore removing the loaded reel, again press lever U, Figure 17, thus restoring the assembly to the take-up position. CAUTION: No twisting, changing, or re- moving af any belt is necessary when rewind- ing or taking up film, Sound Volume and Tone Control The film volume control knob G4, Fig- ure 7, may now be advanced or re- tarded. The volume control operates quite similarly to volume controls on radio sets and either full volume, to the limit of the amplifier, or minimum volume for the smallest room may be achieved, The tone control C5, Figure 7, is also operated similarly to a tone control on a radio receiver, and the range of the tone control is such as to fully compen- sate for acoustical conditions of most auditoriums as well as for variations in the particular film being reproduced. The test reel is now to be projected in its entirety, and the operator should re- run this practice film until he becomes thoroughly familiar with every phase of operation and threading. As “The End” title appears on the screen, the operator should turn the projection lamp “off” and, as the end of the narration or music is reached, the film volume control should be reduced until no sound is heard. The remaining “trailer” of film should be permitted to run completely through the machine. Microphone A microphone may be used with any Filmosound. A high-grade crystal micro" phone or high impedance dynamic microphone should be used. Micro- phones are available from Bell & Howell Company, either in the hand or the floor stand type. The microphone jack is accessible through an opening in the front of the projector base. On the “Academy” and “Utility” models, the lower front door of the projector case must be opened. A separate microphone volume control is provided, C6, Figure 7. If you are using a microphone with your Filmosound, we suggest that you write for the bulletin “Public Address Prob- lems with Filmosounds,” which ex- plains this subject in detail. Phonograph Turntables Phonograph turntables equipped with either the crystal pick-up or a high impedance magnetic pick-up may be used. The same receptacle is used for phonograph reproduction as for the microphone. To use both a microphone and a phono- graph at the same time, a “У? mixer- cord for this purpose should be obtained from Beli & Howell Company. The connector plug used for both phono- graph and microphone is the Yaxley `75-А or equivalent. The microphone volume control on the Filmosound amplifier control panel operates as a volume control for either the phonograph or the microphone. When the “У” mixer-cord is used, the phonograph is controlled by the volume control on its panel. The microphone volume control affects both microphone and phonograph volume. Using Two Speakers with the Filmosound “Utility” The auxiliary speaker forgthe Filmo- sound “Utility” is supplied with a 25 foot cable, one end of which plugs into a receptacle directly below the 6-prong connection on the main speaker, The other end is inserted into the jack on the auxiliary speaker, Automatic matching is accomplished when the plugs are inserted. Monitor Speaker Where the Filmosound is operated ina booth, a monitor speaker helps to main- tain uniform volume in the auditorium, The Bell & Howell monitor speaker, for Filmosound “Commercial,” “Acad- emy,” or “Utility” is equipped with a volume control, connector cable, and receptacle. The volume control regulates the moni- tor speaker only. The plug at the end of the short cable is connected to the “speaker” receptacle of the amplifier. The speaker cable is connected to the receptacle in the monitor speaker, Pilot Light The pilot light is identified by the chrome plated disc cap mounted on top of the projector casting above the Magnilite condenser. (See the large illustration in the center of the book.) To operate the pilot light, pull the cap forward; to turn it off, push back, Turn off pilot light when film threading is completed. To replace the lamp, turn the chrome plated cap counter-clockwise until it is removed from the assembly, then insert the new lamp and reassemble, Operating the Projector on 220- Volt 50-60-Cycle Alternating Current To operate on 220-volt alternating cur- rent, a 1000-watt, 220-volt to 115-volt transformer is required. Plug the 220- volt side into the AC outlet. Then run the Filmosound “Y” cord from the 115- volt side of the transformer to the Filmosound power receptacles as for normal operation. | Operating on 115-Velt Direct Current To operate the Filmosound on direct BS VOUS DE coña” SPEAKER - ПБУ В.С OR DL, PROJECTOR RECEPTACLE SERTEN — ыы Figure 20 Arrangement and connection of Filmosound units for 115-volt D.C. -10- CORD “A 220 To Wh VOLT РНЕОЗТАТ 13 AM 220 TOUS VOLT RHEOSTAT В AMP. IDE. TO А.С. CONVERTER corp "ви . 229 VOLTS DC. STE AS a Figure 21 Arrangement and connection of NEW. AC. Où DE. PEGUECTOR RECEPTACLE SPEAKER 75 М. AC. AMPLIFIER RECEPTACLE Filmosound units for 220-volt B.C. SCREEN current, a high quality DC to AC con- verter having a capacity of 100 watts is needed for the amplifier only. The projector motor and lamp operate from the direct-current line. Figure 20 illustrates the proper connection. One side of the “У” cord is plugged into the converter while the other side is con- nected to the projector receptacle. The AG output of the converter is connected to the amplifier receptacle. When these con- nections have been made, the operation is the same as for AC. Operating the Projector on 220-Volt Direct Current An 8-ampere rheostat ts required to re- duce a 220-volt direct current line to the 115 volts required for the projector. In addition, a 220-volt DC to 115-volt АС rotary converter of 100 watts mini- mum capacity must be used to supply the amplifier with alternating current. See Figure 21. Operating on 220-Volt or 110-Volt Direct Current If in addition to 220-volt DC, it is de- sired to cope also with 115-volt DG; а 115-volt DC to 115-volt AC rotary converter of 150 watts capacity plus a second rheostat (220-volt DC to 115- volt DG of about 3 ampere capacity) may replace the 220-volt converter, With this latter combination, the rheo- stat is connected between the power source and the converter when operat- ing on 220-volt DC and omitted when operating on 115-volt DC. The connec- tion is essentially the same as 115-volt DC connection explained on page 10, except that on the 220-volt DC, the rheostats are placed one in cach side of the supply line to reduce the voltage to 115, See Figure 21. Important Warning Turn projector and amplifier “оп” and “off” only by the line switches ahead of the rheostals and NOT by the switches on the projector. The latter should always be left “on” when operating on 220-volt DC. The rheostats will function properly only when carrying their normal loads. To provide a switch ahead of each rheostat, order the special “Y” cord equipped unth such switches. Operating on 25-Cycle 115-Volt A.C. (Or less than 30 Cycles) A special amplifier is required for opera- tion on 25 cycle alternating current of less than 50 cycles. Do not attempt to use the 50-60-cycle amplifier on such lines. The special 25-60 cycle amplifier, when installed in the Filmosound, may be operated on any 115 volt alternating current having a frequency between 25 and 60 cycles inclusive. Section 3 Projection Defects and Causes Emergency Trouble Guide I. Filmosound will not operate. This may be due to: (a) Current supply cords not mak- ing proper contact with.the power outlet. (b) No current at the house outlet— (test with ordinary Jamp). 2. No sound: A. If the exciter lamp fails to light, absence of sound may be caused by: (a) Speaker cable not connected at both ends. (b) Amplifier not turned on. (c) Fuse blown (see page 17.) (d) Tubes in wrong sockets or tubes not fully seated in correct sockets. (e) Burned out exciter lamp. Check by replacing with the spare. (Г) Any defective tube in amplifier. B. Should no sound be produced even though the exciter lamp lights, the trouble may be caused by: (a) Volume control not advanced sufficiently toward the high position. (b) Film incorrectly threaded. Re- check threading. (c) Grid clip not attached to the cap on the top of the 6]7 tube. (See GC, Figure 22). (d) Dirt, dust, oil, or other foreign matter obstructing the sound optical system. Turn off the amplifier and clean the sound optical system as directed on page 16, (e) Absence of sound record on the Figure 22 Amplifer removed from projector GC, Grid elip «12 Ga film. To prove that the trouble is not with the Filmosound, remove the film and turn on the amplifier. Turn the volume control knob to “high” position. Pass a card swiftly back and forth between the sound lens and the sound drum. If a loud “thumping” sound is heard from the speaker, the Filmosound itself is operating prop- erly. The lack of sound under this condition would be due to the film. (Г) Defective tubes. Have all tubes tested and replace any which prove to be defective. . Inadequate volume may be the result of: (a} Volume control not advanced far enough. (b) Poorly made or dirty film. Com- pare with sound from a film known to be clean and well made, for in- stance, the practice reel supplied with the Filmosound. (c) Dirt, oil, or other foreign matter partially obstructing the sound opti- cal system. (d) Defective tubes. Have all tubes tested and replace any which prove to be defective. (e) Defective, dirty, or poorly ad- justed exciter lamp (page 17, on “Adjustment”), (1) Low line voltage. 4, Unsatisfactory sound quality may be caused by: (a) “Speed” switch set in silent posi- tion (on “Academy” ог “Utility”), ib} See other causes under the head- ing “Inadequate Volume,” Moises, such as humming, and whistling are usually traceable to defective tubes, Failure to fasten the ampliher firmly in base may also cause noises as may the photetube or the first stage tube, (See check list.) AC hum can sometimes be reduced by reversing the AC plug at the supply socket, Static-like sound may occur if the tube base prongs are dirty, Clean them with No. 00 sandpaper and wipe them well, 5. No Picture: (a) Power supply cord not correctly connected. (b) Lamp switch not turned on. (c) Projector lamp burned out. Re- place it as directed on page 18, 6. Insufficient picture brilliance muy be due to: (a) Extraneous light falling upon the projection screen. (b) Blackened projection lamp, Efecto larop lile may terminate be- fore the lamp actually burns out, Inspect the lamp and replace if MÉCCESATY, (ci Dirty projection lens, condenser, orlamp, Clean asdirected previously. id} Low line voltage. Removing the. Amplifier from the Blimp Case In the "Acadermy” and “Utility” models, the projector must, of course, first be removed from its blimp case in order to make the amplifier accessible. Disconnect line cord and speaker cable. Remove spring take-up belt from motor pulley and the reverse belt from the pulley on the reel arm. Loosen the lock nut discs (which are about the size of a quarter-dollar) found on the studs ex- tending in toward the machine from the rear, the front, the left side, and the top of the machine; and two from the in- side of the door. After these nuts are backed off a trifle, the main portion ol each bolt can be loosened. Loosen either the screws at the back or the screws at the front, in addition to the screw at the top extending toward the gear case housing. It is unnecessary to loosen screws at both the front and rear at the same time, since any clearance is sufficient to permit the withdrawal of the projector, Having loosened the lock nuts and re- tracted the screws at one end of the pro- jector and retracted the screw at the top, be certain that the tlt mechanism is also fully retracted. While holding the projector case with the left hand, place the right hand around the lamp- house top and pull toward you. The projector will then tilt forward, see Figure 23, and permit removal from the case without detaching the extension legs or any other part of the projector. Removing the Amplifier from the Projector Lay the projector on its side as shown in Figure 24. Turn the tilt control knob to move the tilt legs away from the amplifier, Pull gen thy on the lead wire LW, Figure 24, to disconnect the exciter lamp. Be certain in replacing ike amplifier to re- connect fhe exciter amp lead, With a com or a screw driver, remove the four screws H, Figure 25, Support- ing the amplifier with both hands, pull first on the rear end and ult outward at an angle of about 45 degrees—this is to clear the power transformer and other - 14. parts. While sliding the amplifier to the left, pull straight toward vou, Tube Testing All tubes should be tested about once a month, if the projector is used fre- quently, and replaced if they are not up to standard, Gradual deterioration of the tubes detracts from the amplifier’s effectiveness before the tubes stop func- Нога, А complete set of spare tubes should be carried with the Filmosound to avoid missing a scheduled show. Correct tube types are shown on labels near each socket, [tis essential that each tube be inserted in the correct socket, Assuming that a tube has become defec- tive, and the installation of the new set of tubes has corrected the difficulty, it then becomes necessary to isolate and eliminate the defective tube. Alter the showing has been completed, remove the amplifier from the projector. Une at a time the old tubes should be replaced in the amplifier, the correct connection made with the speaker and power source, and the amplifier turned on. A loud humming noise will be heard due to exposure of the photo tube when the amplifier is functioning, As soon as the defective tube is placed in it, the noise probably will not be heard, This, together with possible new or different noises, will help to identify the defective tube, If the difheulty with the amplifier was an extrancous noise due to a defective lube, gently tapping each of the tubes with the end of a pencil will cause a “rasping" noise when the defective tube is tapped. Figure 25 Removing amplifier from projector Н. Amplifier retaining screws Removing projector from ‘blimp’ Removing amplifier from projector H. Amplifier retaining screws Discard the defective tube and install a new tube of the same type, Correct Tubes for the Filmosound Amplifier Since new types of tubes are frequently used in Filmosound amplifiers as they are made available by the tube manu- facturers, and the model of the Filmo- sound is not necessarily changed be- cause of this, we do not append a list of tubes used in this Filmosound. Refer to your check list, or if it has become lost, remove the amplifier from ‚ фе Filmosound and check the labels identifying the sockets. Replacement Tubes Although the tubes used in the Filmo- sound can be obtained from most radio stores, it is advisable to use tubes which have been thoroughly tested in Filmo- sound amplifiers, as well as on standard tube testers, by the Bell & Howell Company, to insure finest quality of reproduction. Special Filmosound Models and Extra Equipment Special Filmosound models, such as those required for 25-cycle alternating current operation as well as all other accessories required for the most elabor- ate show are available from the Bell & Howell Company or its dealers. Among the accessories or extra equipment most likely to be required are: DC to AC converters; extension cords for speakers, lines, or microphones; auxiliary speaker for “Utility” model; booster amplifiers for greater sound volume; spare projec- tion lenses of various focal lengths; spare lamps; complete set of spare tubes; oil; lens cleaning kit; screens; etc. Check List Included in the envelope in which this instruction book was found, is a check list which itemizes all of the accessories and spares which are standard equip- ment with your particular Filmosound. Immediately after unpacking be sure to check the material against this list to insure (a) that none of the parts have been discarded with the packing ma- terial (b) that none of the spares have been inadvertently omitted from the shipment. Suggestions for Presenting an Effective Show A booklet on this subject is packed in the envelope with your instruction book. If you need additional copies, write Bell & Howell Company, 1801 Larchmont Avenue, Chicago. Projected Picture Sizes Obtained with Filmo Projection Lenses Lens Distance in Feet fram Screen Focal Length | Lio | 12 | 16 | 20° | 25* | 32 | 56 | 40” | 50° | 64 | 75° | 100] 125/150" Iömm. - - Projector РАНИЛ of Picture ee” Lain] 640 ТР SP 1IZO" Lo 49" Ep” 69” #4" 1070" 12'6* .,, НЫ 1 vol 39°] 46 670 7'e 41143 st Laa”... 114" lool oer] IO sol 6737] 8 of 9 TZ 2" 176 1710"| 273" 30 aor] 28) 67 OF GF OFT 77 5°] 974" 11711" 1470" |18’9* 23/5" |281" 214" val gel 170". 274*| mort vo aso 5" 4*] or 7'é* | 71131150" 119"8*[22'5" ES Tel 16") 20° 25 Fr 4° ar] 4° 6°] 5° 0") 6'3* | 8° or) arar 120" 1577" 18'8* 314" |... ro} el gel 21} 2e 3° ano] 4” 3°) 574 | 6711| B’0"|10°8"119°4"116'0" O ee PA 191% 1511101 274° o ls sar gt 478” | ot or] FTL 94*(118")14'07 ‚15. S, ection 4 Care and Maintenance of Filmosound Cleaning Optical Parts Before every show, and at any other time that appears necessary, the projec- tion lens and aperture should becleaned, The projection lens as well as the con- denser lens and the Magnilite con- denser, on machines equipped with this device, must be kept scrupulously clean and free from dirt and oil. For clean- ing, use the B&H lens cleaning kit or Filmo lens cleaning tissue, either of which may be secured fram your Filmo dealer at smail expense. The projector lens, L, Figure 18, is re- moved merely by pulling forward on the lens barrel LB, Figure 18. The front and rear lens elements are then accessible for cleaning. If only a slight amount of dust has accumulated on these lenses, merely use lens cleaning tissue to remove the dust. If, however, finger prints, oil, grease, or other accumulations of dirt are present, lens cleaning fluid should be wiped on the lens surface and followed by a thorough cleaning with lens cleaning tissue. The same treatment should be given the Magnilite condenser (on “Utility” model) GM, Figure 19; and the main condenser lens C, Figure 19, on all models. The condenser and the Magnilite con- denser are removed from the projector by pulling on the holder handles, Figure 19. ‘They should be cleaned frequently with the same materials as used for the lens, Never attempt to remove or adjust the lens of the sound optical system. This requires special training and equipment. This lens, with one face exposed within the exciter lamp compartment and the other exposed toward the sound drum should be cleaned occasionally. The mirror which can be seen by looking down behind the sound drum from in front of and above the Filmosound should also be cleaned occasionally. Remove the exciter lamp compartment cover, by the same methods employed to replace the exciter lamp. This is de- scribed in a following paragraph. Both ends of the lens of the sound opti- cal system should then be cleaned with cleaning tissue wrapped around the end of a toothpick, as should the mirror, already described. Cleaning Film Handling Parts Must Be Done While the Projector Is Not Operating! The aperture should be cleaned by re- moving the lens from its carrier and inserting the aperture brush, supplied with the projector, through the opening. The film channel is cleaned by drawing a Clean lintless cloth through it. The gate must be open and the machine not running, A feature of the most current model Filmo Projectors is the removable gate Figure 26 :16- Letters Refer to Figure 27 Silent Speed Sound Speed Cup C . . . . One drop of oil after each One drop of oil after each eight hours of operation four hours of operation Cups B One drop of oil after each One drop of oil after each andA . , . thirty-two hours of operation sixteen hours of operation Sprockets Saturate felts once every six Saturate felts once every D (3). . . . months shoe illustrated in Figure 26. ‘To remove, grasp the metal frame F, Figure 26, and withdraw. Use no toolsí Clean and polish shee with a soft cloth. If dirt or emulsion has gathered and hardened on the shoe, remove by rubbing with a soft dampened cloth. To avoid scratching polished surface use no sharp tools, Re- place it being sure that the tines, T, Figure 26, are guided to the grooves formed by the metal plate attached to the back of the lens casting. An audible click will be heard when the metal [raıne, E, is correctly positioned. Figure 27 Points requiring lubrication ‘17: three months Projector Lubrication The addition of oil at the few places provided is a simple but very important part of Filmosound operation. Proper oiling will assure a long trouble-free life. A lack of oil will result in serious dam- age. See above chart. To saturate the felts within the sprocket shaft, have the projector disconnected from the line and speaker and lay it on its side. Insert the tip of the Filmo oil can into the holes D, Figure 27, and squeeze the sides of the oil can about three times. Exciter Lamp Replacement The exciter lamp is beneath a three- sided metal cover at the front right- hand corner of projector base Z, Figure 19, Unscrew the thumb nut (on the front) and remove the cover af the ex- citer lamp compartment. Press the lamp down, turn it counter-clockwise slightly, and lift it out. It is not necessary to loosen the set screw which holds the exciter lamp socket in place. After a new exciter is installed and before it is lighted, wipe it (as a lens) to remove all finger marks, An extra exciter lamp is provided with each Filmosound. Ordinarily, no adjustment is required when an exciter lamp is replaced. How- ever, if the filament is not in line with the inscribed mark directly behind the lamp, loosen the two set screws on the socket. Carefully move the lamp up or down, so that on sighting directly across the top of the filament, the inscribed line, immediately to the rear of the ex- citer lamp, and the filament coincide. "BRD EXCITER LAMP Care must be taken not to revalve the lamp. Only a turn or two is necessary ta loosen the two screws.and they should not be re-tightened too tightly, but just enough to hold the socket securely. Fuse Replacement A 2-ampere fuse, FU, Figure 6, is provided in the amplifier. It should be checked immediately if the exciter lamp fails to light. The fuse will burn out if direct current is fed into the amplifier supply receptacle. Always disconnect the line cords before removing the fuse. Never use a fuse larger than the 2-ampere size, Projector Lamp Replacement To replace a projector lamp, unscrew the cap at the bottom of the lamphouse and allow the lamp to slide out into the hands. If a projector lamp is being replaced during a show, be careful as the lamp slides down to grasp it by the relatively cool centering ring. This operation should be performed quickly, since a moment or two after the lamp is dis- engaged from the socket, the centering ring, acting as a cooling flange, becomes quite warm. Insert the new lamp with the vertical tongue on the centering ring toward the front of the projector and revolve it slightly one way or the other until the tongue settles into the centering slot in the bottom of the lamphouse. Replace the screw cap, making sure that tt screws in squarely and tightly to lock the lamp in the proper position. Never attempt to change a lamp with the current on. Since the lamps are designed to burn base down, the machine must not be turned upside down or laid on its side while the lamp is burning. Reflector Adjustment Though the reflector is correctly ad- justed for the original lamp, there is some likelihood that readjustment will be required after the lamp has been replaced with a new one. To makc the adjustment, remove the lens, and the Magnilite Condenser, CM, figure 19, start the projector and with the lamp on, hold a sheet of paper about 14” from the front of the lens carrier. The image of the lamp filament will be plainly seen and if the entire area is evenly illuminated with no dark or vertical streaks, the adjustment is good and should be left as is. FIGURE 28 AA Reflector adjustment locking screw BB Reflector jacket DD Reflector lateral adjustment screw Should there be dark areas between the filament coils, like spacing in a picket fence, loosen the locking screw AA, figure 28, and turn the lateral adjust- ment screw DD right or left until the illumination becomes even, If, by turn- ing this screw, the open spaces are not filled up, further adjustment must be made by turning the reflector jacket BB slightly, Do not rotate the reflector Jacket unnecessarily. When a tightiv fitted succession of vertical coils is seen, tighten the locking screw АА. NOTE: On later model Filmosounds, the reflector replacing BB, Figure 28, is perma- nently adjusted at the factory. No further adjustments should be attempted and the data covering reflector adjustment in the instruce lion book should be disregarded, |. i # f E à 2 E zi $ N у fog # f # À iy $ # fos: 7 ЕЯ at Po Fi RÉ = & + E ‘à Feed reel | Ford ree] arm RC | ES BT i Han A Feed reel arm fa if if ff ini ma ey as IN | И | ыы И La hBeverso belt Mine h operating Lena Jock EN | E a а | - Е E Lena о DU A 1 rt ay ey rf u у ¡La Magnilite BE condenar (role opening rer Sprocket No, 2 = Си арг dl В = | bir eel — ating #8 ei ae per Tilt, adjuetment ИЕ aw fet ae we a : f Exciter lamp yar? we Prajector mounting ве | > a ae a à Dur i > = =. a =. Г Ш ‘hk et AML ‹ if 4 22's = о ACE A if ae a 2% A + A % к oF E rs AS 6 % % . % é # : LALALA A ut 1 % Е Е 5 4, a * EF = a er à 2% * +
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