RCA-Victor-Co-Inc-TRK-5 电路原理图.pdf

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1、收音机爱 好者资料库 RadioFans.CN MANUAL OF 1940 MOST POPULAR SERVICE DIAGRAMS 7W MODEL TRK-5 and MODEL TT-5 Antenna Installation: In most cases, the antenna should not be installed per manently on the apartment or residence roof until the quality of the picture reception has been observed on a Television Rec

2、eiver. A temporary transmission line can be run between receiver and the antenna allowing sufficient slack to permit moving the antenna. Then, with a telephone system connect ing an observer at the receiver and an assistant on the roof to find an antenna location, the antenna can be positioned to gi

3、ve the most satisfactory results on the received signal. A shift of only a few feet in antenna position or direction may effect a tremendous difference in picture reception. Whenever possible, the antenna location should be chosen or erected so the antenna is not only Droadside to the trans mitter b

4、ut removed as far as possible from highways, hospitals and doctors offices, and similar sources of interference. Auto ignition and diathermy apparatus may cause noise inter ference which spoils the picture. In mounting any antenna, care must be taken to keep the antenna rods or pickup wires proper a

5、t least Vi wave length (at least 6 feet) away from other antennas, metal roofs and gutters or metal objects. Under certain extremely unusual conditions, it may be possible to rotate or position the antenna so it receives the cleanest picture over a reflected path. If such is the case, the antenna sh

6、ould be so positioned. However, such a position may give variable results as- the nature of reflecting surfaces may vary with weather conditions, as a wet surface has been known to have different reflecting characteristics than a dry surface. In short, a television receiving antenna and its installa

7、tion must conform to much higher standards than an antenna for reception of International Short Wave and Standard Broad cast signals because; (1) Intervening obstacles have a pronounced shielding effect on the ultrahigh frequency waves producing low intensity signals. Severe trouble with multipath t

8、ransmissions may be experienced, especially in congested city areas. (2) The picture signal is comprised of a very wide band or range of frequencies, all of which must be received with good efficiency. (3) It must be continually remembered that the discern ment of the eye is much more critical than

9、that of the ear. CENTERING CENTERING CR07) (R70) (RflO) (RIOO) (R9 6) No attempt should ever be made to measure the high (2,000 volts) voltage, because of the dangers and difficulties involved. If at any time it becomes necessary to service the high voltage circuit, the suspected parts should be rep

10、laced by parts known to be in good operating condition. Always replace the red can over the 879 high voltage rectifier. The most dangerous portion of the receiver is the plate (top cap) lead for the 879 high voltage rectifier. Always be very careful when working near or with this lead. When working

11、on the high voltage supply portion of this chassis, the following precautions should be observed: 1. Remove power supply cord from the power supp socket. 2. Use only one hand at a time. 3. Connect a shorting lead between ground (firstly) and to the high voltage side. 4 Whenever working with the oihf

12、illed high voltage filter capacitors, keep a constant short across the capacitor, as these capacitors do not completely lose their charge after being discharged a single or several subsequent times. 5. Only one person at a time should work on the unit to prevent any misunderstanding which may result

13、 in an accident. When it is desired to measure any voltages on the Video portion of the chassis, the primary leads of the high voltage transformer should be disconnected and taped together. When any changes are made on the Video portion of the chassis, the locations of leads and parts should be retu

14、rned as closely as possible to their original positions. Service Hints; 1. In some cases the horizontal sweep oscillator circuit will radiate energy to nearby broadcast receiving antennas and lead-ins, causing interference with standard broadcast re ceivers. 2. If the picture “tears out when the rec

15、eiver is jarred it may be due to microphomc 1852, 1853, or 6J5 tubes. 3. The 6J5 oscillator tube should be removed without rocking it in its socket to loosen it, as the motion may cause the 80.5 mmf capacitor Cl6 to break off. 4 The coils or straps in the h.f. oscillator circuits should not be touch

16、ed or moved or the alignment of the receiver will be disturbed. 5. The insulator on the high voltage filter capacitors may become dirty and break down to short out the high voltage. 6. The two Video coupling capacitors C44, 45, should be kept clear of chassis. 7. In some cases the metal Kinescope mo

17、unting shield may become magnetized by the earths or some nearby magnetic field, and thus distort the picture on the screen towards the magnetized portion of the shield. The shield can be de magnetized by passing it slowly through a solenoid which is energized by an aC current. 1021 COMPILED BY M. N

18、. BEITMAN, SUPREME PUBLICATIONS 收音机爱 好者资料库 RadioFans.CN PAC 93-C MODEL TRK-5 and MODEL Seventeen -Tube, AC, Superheterodyne, Five -Television -Channel Receiver with Eight -Tube, Three -Band, AC, Superheterodyne, Broadcast Receiver AND Seventeen Tube, AC, Superheterodyne, Five -Television -Channel Ta

19、ble Model Attachment Model TT -5 Height 161/4 inches Width 191/2 inches Depth (overall) 191/2 inches Net Weight 57 pounds Shipping Weight. 73 pounds Chassis Numbers and Power Supply Ratings Model TF -5: Chassis KC -3, 105.125 volts, 60 cycles 190 watts Chassis KC -3B, 105125 volts, 50-60 cycles 190

20、watts Model TRK-5: Chassis KC -3A, RC -429, RS -89A, 105.125 volts, 60 cycles 275 watts (total) Chassis KC -3C, RC -429, RS -89A, 105-125 volts, 50-60 cycles. 275 watts (total) Model TRK-5 Height 44 inches Width 291/2 inches Depth (overall) 191/2 inches Net Weight 117 pounds Shipping Weight 186 poun

21、ds General Description Model TRK-5 consists of a console -type, seventeen -tube, direct -viewing, five -channel, Television receiver; and an eight -tube, three -band, broadcast radio receiver enclosed in a modern styled cabinet. Features of the Television Receiver include: Five -inch Kinescope; Styr

22、ol (humidity -resisting) i -f and r -f transformer forms; single -station -selector switch; temperature compensated condensers; iron core i -f and r -f tuning; double safety switch protection; safety glass viewing window; automatic brightness control; and automatic volume control. Model TT -5 is a s

23、eventeen -tube, direct -viewing, 59e - channel, table model Television receiver (picture only), which may be easily connected to any modern broadcast radio receiver for the accompaying sound reproduction. Television features for the Model TT -5 receiver are the same as in the Model TRK-5. RCA VICTOR

24、 DIVISION OF RADIO CORPORATION OF AMERICA, CAMDEN N. J., U. S. A. 收音机爱 好者资料库 RadioFans.CN PAGE 94-C TRK-5, TT -5 RCA TUBE COMPLEMENT In KC -3, KC -3B (TT -5) and KC -3A, KC -3C (TRK-5) Television Chassis: (1) RCA-6AC7/1852 1st Det. (2) RCA -6J5 Oscillator (3) RCA -6B7/1853 1.st Pix. I.F. (4) RCA-6AC

25、7/1852 2nd Pix. I.F. (5) RCA-6AC7/1852 3rd Pix. I.F. (6) RCA -6H6 Pix. 2nd Det.-Sync. Sep. (7) RCA -6V6 Video Amp. (8) RCA-5BP4/1802-134 Kinescope (9) RCA -6B7/1853 1st Sound I.F. (10) RCA -6B8 Sound 2nd Det.-AVC (11) RCA -6N7 Sync. Amp. (12) RCA -6N7 Vert. Osc.-Discharge (13) RCA -6N7 Vert. Output

26、(14) RCA -6N7 Hor. Osc.-Discharge (15) RCA -6F8 -G Hor. Output (16) RCA -5U4 -G Low Voltage Rect. (17) RCA -2X2/879 High Voltage Rect. TELEVISION RECEIVER Electrical Specifications TELEVISION CHANNELS (Selector Switch Positions) 1 50 to 56 mc. 3 66 to 72 mc. 2 60 to 66 mc. 4 98 to 84 mc. 5 84 to 90

27、mc. Overall Band Width (approx.) 2.5 mc. Scanning Interlaced, 525 Line Horizontal (Line) Scanning Frequency (Sawtooth Wave) 15,750 cps. Vertical (Field) Scanning Frequency (Sawtooth Wave) 60 cps. Frame Frequency 30 cps. Picture Size (approximate mask dimensions) . 33/8 x 43/8 in. Chassis Base Dimens

28、ions 13 x 18 in. Max.; height 9 in. IMPORTANT PRECAUTIONS CAUTION: These instruments contain high voltage (3,000 volts). Interlock switches are pro- vided for high voltage protection. Do not attempt to service these instruments until you have studied these Service Notes thoroughly, and are familiar

29、with the precautions necessary when servicing these instruments. Do not attempt to measure the high voltage (2,000 volts). ALWAYS replace the red can over the 2X2/879 high voltage rectifier. The most dan- gerous portion of the H.V. supply is the plate lead of the 2X2/879 tube. Do not eliminate the p

30、rotection afforded by the interlock switches or measure any voltages on the video chassis unless the gray secondary plate lead of the high voltage transformer has been un- soldered, a rubber tube Stock No. 34096 slipped over the lead, and taped to the lead. Use only one hand when working on the high

31、 voltage portion of the chassis, and always connect a shorting lead first to ground, then to the high side of the first high voltage filter capacitor. Always wear gloves and goggles when handling Kinescopes. A good ground should be connected to the re- ceiver at all times. Precautions in Handling Ki

32、nescopes The Kinescope bulb encloses a high vacuum and due to its large surface area, is subjected to considerable air pressure. For these reasons, Kinescopes must be handled with more care than an ordinary receiving tube. The large end of the Kinescope bulb - particularly that part at the rim of th

33、e viewing surface - must not be struck, scratched or subjected to more than moderate pressure at any time. If the tube sticks, or fails to slip into its socket or shield smoothly, investigate and remove the cause of trouble. Do not force the tube. All RCA Kinescopes are shipped in special cartons an

34、d should always be left in the cartons until ready for installa- tion in the receiver. Keep the carton for future use. CAUTION: Do not open the shipping carton, install or handle the Kinescope in any manner unless shatter -proof goggles and heavy gloves are worn. People not so equipped should be kep

35、t away while handling Kinescopes. Keep Kine- scope away from body when handling. Notes 1. This service note includes all changes that have been incorporated since initial production, including deletion of the 44-50 mc. channel and addition of the 60.66 mc. channel. 2. Detailed explanation of the rec

36、eiver circuit operation may he found in the booklet: Practical Television by RCA. 3 Alignment. - Because of the special equipment and procedure necessary for the proper alignment of these receivers, the alignment will not he covered in this service note. Operation Model TRK-5 The power -volume contr

37、ol on the broadcast radio receiver turns on the power for the complete receiver. Pushing the button marked Television on the push button panel turns on the Television receiver, if the above power control is On. The volume control of the broadcast receiver also controls the Television sound volume le

38、vel. Station Selector and Fine Tuning.-The outer ring O section of the central dual control knob on the Television panel selects the station from which it is desired to receive television transmission. Five television channels are covered as follows: (1) 50 to 56 M.C. (2) 60 to 66 M.C. (3) 66 to 72

39、M.C. (4) 78 to 84 M.C. (5) 84 to 90 M.C. Set the station selector to the number corresponding to the frequency of the station from which it is desired to receive Television Broadcasts. PAGE 95-C The inner section I of this knob is used for fine tuning and may eliminate moving ripples or distortion i

40、f due to in- terfering radio signals. Before the Television portion of the receiver is turned ON it is advisable to turn the Brightness and Contrast controls completely counter -clockwise to reduce the illumina tion of the spot which appears on the Kinescope before the sweep circuits have started fu

41、nctioning. Contrast and Brightness Controls.-The inner I section of the Contrast Brightness controls is the Contrast control and varies the black and white tones of the picture being received. Too little contrast makes the picture all half -tones or grays. Turning clockwise increases contrast from g

42、rays, to black and white. See Operating Instructions for this receiver. The outer ring O is the Brightness Control and affects the average illumination of the picture. Turning clockwise increases the brightness. See Operating Instructions for this receiver. Hold Controls.-The dual knobs on the Telev

43、ision panel marked Horizontal and Vertical Hold, control the pic- ture stability. The inner section designated by a I is the Horizontal Hold Control and when being set should be turned slowly to the point at which the picture locks in horizontally. See Operating Instructions for this receiver. The o

44、uter ring section designated by O is the Vertical Hold Control and when being set should be turned to the point where the picture locks in vertically. These two controls on this dual knob should not ordi- narily require readjustment after good picture reception has once been obtained. An occasional

45、resetting may be neces- sary due to changing to a different station, and to the gradual aging of the tubes. Focus Control.-This control is located on the tear of the Video chassis, and controls the electron beam focus of the Kinescope. Ordinarily, after once being focused the Kine- scope should not

46、require re -focusing for a considerable length of time. Operation Model TT -5 The operation of Model TT -5 is the same as that for the Model TRK-5 except that there is a separate ON-OFF switch, and a separate sound volume control because the broadcast radio receiver is not included in this model. Wh

47、en Model TT -5 is connected to a broadcast receiver for the Television sound reproduction, the broadcast receiver volume control should be turned to maximum and the Television sound volume controlled with the control on the Television Receiver. SERVICE DATA Kinescope Installation Models TRK5, TT -5:

48、 Refer to figure 3. 1. Remove back cover from cabinet. 2. Remove Kinescope mounting shield from shipping carton. 3. Using gloves and goggles remove Kinescope from shipping carton and place in the cone -shaped mount- ing shield. 4. Guide the Kinescope and mounting shield carefully into the cabinet, p

49、lacing the Kinescope firmly up against the mask and viewing window. Fasten the mounting shield firmly in place with the thumb screw provided, so that it holds the Kinescope firmly against the mask. If the Kinescope does not line up properly with the. mask, loostn the screws A and nut B and adjust in the direction desired. 5. After the receiver is operating, the Kinescope may be rotated to properly square up the picture with the mask. CAUTION: When rotating tube the power should be turned OFF. Adjustments.-Th