GE-HM-171-HM-185-Rider-TV1电路原理图.pdf

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1、GENERAL ELEC Fig. 5. Schematic Diagram Model HM-171 John F. Rider RadioFans.CN GE TV PAGE MODEL HM-171 ELECTRIC CO. Resistance of Video and Audio I.F. Transformer Windings Approximately Equal to One Ohm For test patterns see back of Manual RadioFans.CN TV PAGE 1-3J4 , GE GENERAL EIJ Fig. 7. Schemati

2、c Diagram Model HM-185 John F. Rider RadioFans.CN ELECTRIC CO istance of Video and Audio I.F. Transformer Windings Approximately Equal to One Ohm For test patterns see back of Manual RadioFans.CN VOLUME BRIGHTNESS FOCUS 2lln TUNING CONTRAST TONE O O o o O O Fig. 2. Front Panel Control Location Model

3、 HM-185 (NoteModel HM-171 Control Location is same as above with Volume and Tone Controls removed.) zoruo. TTETICAL TTEHTICAJ. WTDK xuammtd. TTOTICAI CXTCVBM cnraan un GENERAL ELECTRIC CO. TELEVISION RECEIVERS (REVISED FOR NEW STANDARDS) CHANGES IN THE SCHEMATIC DIAGRAM 1- A RESISTOR OF 4700OHMS IS

4、CONNECTED ACROSS THE PRIMARY OF THE I.F. TRANSFORMER T7. 2- THE RESISTOR R123 3- A RESISTOR OF 4700 IS CHANGED FROM 3900 TO 4700 OHMS. OHMS IS CONNECTED ACROSS THE PRIMARY OF THE I.F. TRANSFORMER T6. 4- A RESISTOR OF 220,000 OHMS IS CONNECTED BETWEEN THE JUNCTION OF R145 AND R146 AND GROUND. 5- A RE

5、SISTOR OF 330 OHMS IS INSERTED THE PICTURE TUBE. IN THE CONTROL GRID LEAD OF REVISED TELEVISION ALIGNMENT PROCEDURE The probltm of aligning the several circuits in a television receiver is much more involved and requires more specialized equipment than the alignment of conventional radio re- ceivers

6、. Fortunately, the use of stable components in care- fully engineered circuits of wide-band characteristic reduces to a minimum the necessity for alignment under normal operating conditions. Should alignment become necessary /, the following equipment will be needed: (A) For Video I. F. Alignment (1

7、) Cathode ray oscilloscope. (2) Wide-band sweep oscillator capable of sweeping from 7.5 to 15 MC. (3) Marker system either provided lator or from separate signal locating JZ.YI) and 1J./5 fvl pou (B) Sound I.F. Alignment in sweep oscil- generator for it1 (1) Cathode ray oscilloscope. (2) Wide-band s

8、weep oscillator capable of sweeping from 7.75 to 8.75 MC. (3) Marker system either provided in sweep oscil- lator or from separate signal generator for locating 8.15 and 8.35 MC points. ) R.F. Alignment ; (1) Cathode ray oscilloscope (2) Wide-band sweep oscillator capable of sweeping the following b

9、ands: (a) 50 to 56 MC (b) 60 to 66 MC (c) 66 to 72 MC * (d) 78 to 84 MC * Those receivers which were aligned at the factory for Band No. 4 must use this r-f sweep frequency. VIDEO I.F. ALIGNMENT Input Freq. 1. 2. 7.5-15 MC Sweep Point of Input Adjustments Conlrol grid of 6AB7 (2nd video I.F.) Commen

10、ts Connect vertical input cable of cathode ray oscilloscope across resistor R-182 of 6F8G video detector. Connect output tap of video I.F. sweep oscillator to control grid of 6AB7 (2nd video I.F.). Connect ground lead to chassis. Turn contrast control (R-108) to about half of maximum or to a point w

11、hich gives satisfactory vertical deflection without overloading. Set horizontal centering and gain controls on oscilloscope to give suitable horizontal deflection. Adjust sweep phase to give curve similar to Fig. 7, curve 1. NOTE: If sweep oscillator has marker points internally supplied, steps 3 an

12、d 4 may be omitted. Signal Input 3. Same as in No. 2 plus 12.75 MC 4. Same as in No. 2 plus 10.75 MC 5. 7.5-15 MC Sweep . 6. 7.5-15 MC Sweep 7. 7.5-15 MC Sweep 8. 7.5-15 MC Sweep 9. 14.25 MC Point of Input Same as in No. 2 Same as in No. 2 Control grid 6AC7 (4th video IF) Control grid 6AB7-3rd video

13、 IF Control grid 6AB7 (2nd video IF) Converter grid, 6F8G Converter grid, 6F8G Adjustments Iron cores of de- tector trans- former T-6 Iron cores of 4th video transformer T-5 Iron cores of 3rd video transformer T-4 Iron cores of 2nd video transformer T-3 open circuit R178, short R102 to ground. Depre

14、ss No. 1 push Dutton. Set tuning control to mid-rotation. Adjust L-8 until curve is centered between maximum horizontal sweep points. Adjust C-70 and C-67 for maximum ampli- tude. See Fig. 7, curve 2. Depress No. 2 push button. Leave tuning control at mid- rotation point. Adjust L-9 for centering; C

15、-71 and C-68 for maximum amplitude. See Fig. 7, curve 2. Depress No. 3 push button. Adjust L-10 for centering; C-72, C-69 for maximum amplitude. See Fig. 7, curve 2. To align oscillator for various bands, set tuning control (C-3) at mid-rotation; then set brass slugs of coils L8, L9, L10 until maxim

16、um audio tone is heard. weep will be 78 to 84 megacycles. * 83.75 Megacycles when Band No. 4 is set up on the No. 3 key. WAVE TRAP ALIGNMENT * In some localities this 1. 11.75 MC with 400 cycle modulation Antenna terminals Wave trap trim- mer, C-95 Adjust for minimum signal response as seen on oscil

17、lo- scope after connections made in Step 2 are re-established; then connect oscilloscope across R182. John F. Rider RadioFans.CN GE TV PAGE 1-9 GENERAL ELECTRIC CO. MODELS HM-171, HM-185 RECOMMENDED PROCEDURE FOR READJUSTING THE R.F. CIRCUITS TO CONFORM TO THE HEW TELEVISION FREQUENCY ALLOCATIONS ON

18、 THE LOWER CHANNELS. Necessary Equipment: HT Oscilloscope - G.E. Model CRO-5-S or equivalent. (2) Wide-band sweep oscillator capable of sweeping the following bands: (a) 54 to 60 MC (b) 66 to 72 lie (c) ?6 to 62 MC (3) Accurately calibrated absorption v/ave raeter with a frequency range of at least

19、54 to 62 MC. (4) Accurately calibrated signal generator with a frequency range of at least 59.75 to 81.75 MC with 30$ tone modulation. (5) 50,000 ohm 1/2-W resistor. PROCEDURE FOR CIRCUITS ASSOCIATE) WITH ;fl PUSH BUTTON. 1. Disconnect low side of R-102 and connect a 50,000 ohm resistor in series wi

20、th it to ground. 2. Remove all rectifier tubes. 3. Connect vertical input of oscilloscope across R-102 and the 50,000 ohm resistor. 4. Conne-ct wide band sweep generator to antenna terminals and adjust for a 54-60 MC Sweep. Output of generator should be set near maximum. 5. Depress the /I push-butto

21、n (heaters should be on) and adjust sweep and sync controls on scope to give a curve similar to Fig. 1. 6 , . Turn band width adjustment coupling condenser C-78 in until tight, then open approximately 1/16 of a turn. 7. Check location of the 54 and 60 MC points on the curve with the absorption wave

22、meter. $. Adjust trimmers C-67 and C-70 until the 54 and 60 MC points appear on the curve as shown in Fig. 2. It will probably be necessary to decrease the inductance of L-ll somewhat by spreading the coil, before the 54 and 60 MC points conic in at the proper place-. 9. Remove the 50,000 ohm resist

23、or, connect R-102 back to normal, remove scope and replace rectifier tubes. 10. Disconnect wide band sweep generator from antenna terminals arid connect in its place the modulated signal generator adjusted to exactly 59.75 1IC. John F. Rider RadioFans.CN TV PAGE 1-10 GE MODELS HM-171, HM-185 GENERAL

24、 ELECTRIC CO. 11. Set tuning control C-3 to mid-rotation. Adjust brass slug of L-8 until maximum audio tone is heard, -with volume control turned part- ially up. If -slug does not have sufficient range, it vail be ncc- ess.iry to decrease the. inductance of L-8 somewhat by spreading the coil. PROCED

25、URE FOP. CIRCUITS ASSOCIATED WITH #2 P.B. 1. Same as for the #1 P. B. 2. ditto 3. 4. except that the oscillator is adjusted for a 66-72 MC sweep. 5. Depress the /2 push button. 6. Do not re-adjust C-76. Check location of the 66-72 IvJC points on curve with absorption meter. 7. Adjust trimmers C-68 a

26、nd C-71 until the 66-72 MC points appear on curve as shown in Fig. 4. It may be necessary to decrease the in- ductance of L-13 by spreading the coil in c-rder to bring the 66-72 LIC points at the proper place on the curve. 8. Same as in step #9 for the #1 P. B. 9. #10 except that the modulated signa

27、l generator is adjusted to exactly 71.75 MC. 10. Same as in step #11 for the #1 push button, except that the brass slug of L-9 is adjusted and it will be necessary to de- crease the inductance of L-9 by spreading the coil. PROCEDURE FOR CIRCUITS ASSOCIATE .WITH ff3 P.E. 1. Same as for the #1 P.B. 2.

28、 ditto 3. 4. , -except that the oscillator is adjusted for a 76-82 MC sweep. 5. Depress the /3 push button. 6. Check location of the 76-82 MC points on curve with absorption wave- meter. 7. Adjust trimmers C-69 and C-72 uritil the 76-82 MC points appear on curve as shown in Fig. 5. It vdll be necess

29、ary to increase the in- ductance of L-14 somewhat by squeezing the coil together in order to bring the 76-82 MC points at the proper place on the curve. 8. Same as in stop #9 for the #1 P.B. 9. rt n it ii #10 except that the modulated signal generator is adjusted to exactly 81,75 MC. 10. Same as in

30、step #11 for the #1 P.B. - except that the brass slug of L-10 is adjusted, and it will be necessary to increase the inductance of L-10 by squeezing the coil together. John F. Rider RadioFans.CN GE TV PAGE 1-1 GENERAL ELECTRIC CO. MODJuLS HM-171, HM-185 62 72 GENERAL INFORMATION General Electric Pict

31、ure Receiver and Sound Converter Model HM-171, ii a table type, 17-tube, superheterodyne receiver equipped with a 6-inch, electrostatic-deflected, pic- ture tube. The receiver works in conjunction with any radio receiver, which is designed for phonograph reproduction, to reproduce -the sound portion

32、 of the television broad- cast. General Electric Television Receiver, Model HM-185 is a console type, 18-tube, superheterodyne receiver with a complete sound channel and using a 6-inchp electrostatic- deflected picture tube. Additional design features include iron-core I.F. tuning, automatic tone co

33、mpensation, automatic volume control and constant high-gain antenna coupling circuit. Electric*! Specifications Maximum Electrical Output Model HM-171. (Dependent upon radio receiver output) Model HM-185 5 watts LoudspeakerAlnico Magnetic Dynamic Model HM-185 Cone Diameter 12 inches Voice Coil Imped

34、ance (400 cycles) 3.5 ohms Picture Site Height 3 Ji inches Width 4Jf inches Model HM-171 HM-185 Power Supply (Voltl) 115-126 116-125 Frequency (Cyclei per Second) 60 60 Power Consumption (Watts) 170 170 Tubes Tuning Frequency Range Band No. 1 44-50 MC. Band No.2 50-56 MC. Band No. 3 66-72 MC. Interm

35、ediate Frequencies Television Vifleo (Picture) 12.75 MC. Television Arittio 8.28 MC. Converter-Oscillator GE-6P8G Audio therefore, every precaution must be exercised to insure safety to the service engineer and to the customer. The back cover while in place, protects the user and should never be rem

36、oved except by a qualified television service engineer. The power-cord plug should not be inserted in a power supply outlet until a good, solid ground connection has been properly made to the receiver chassis. For safety, the following operations must be performed with the power plug disconnected be

37、fore working on the receiver with the back cover removed: 1. Locate the 879/2X2 high voltage rectifier tube socket 2. Unsolder the lead (color-coded brown and yellow and measuring 3300 ohms to chassis) which is connected to the 879/2X2 tube socket. 3. Thoroughly insulate the exposed end of this lead

38、. All adjustments not accessible with the baqk cover it place can be made without energizing the high-voltagt circuits. Servicing of the high-voltage circuits can be satisfactorily performed with the power-cord removed from any power supply outlet. A resistance check of the circuit components will i

39、ndicate any trouble existing. (HIGH VOLTAGES SHOULD NEVER BE MEASURED.) The picture tube is highly evacuated and is consequently subject to a very great air pressure. If it is broken, glass fragments will be violently expelled. Handle with care, using safety goggles and gloves. The large end of the

40、picture tube particularly that part at the rim of the viewing surfacemust not be struck, scratched, or subjected to more than moderate pressure DO NOT FORCE THE SOCKET ONTO THE TUBE OR STRAIN ANY EXTERNAL CONNECTIONS. If it fails to slip into place smoothly, investigate and remove the cause of the t

41、rouble. John F. Rider RadioFans.CN REPLACEMENT PARTS LIST Models HM-171 and REPLACEMENT PARTS LIST (Continued) models n m - i / i ana nm-io? Parti Common lo Both Radio and Gelevuion jinc Faciorr-tested Pins, Available from Autho RB-008 RB-009 RB-II5K RB-OfiO RB-096 RB-621 RC-(K)8 RC-009 RC Oil RC-02

42、3 RC-028 RC.039 RC-048 RC-(l4fl RC.072 RC-090 RC-096 RC-123 RC-9139 RC-5140 RC-016 RK-OM RQ-525 RQ-645 RQ.670 RQ-695 RQ-774 RQ.-1243 RQ-1245 RQ-1251 RQ.-1259 RQ-1267 RQ.-1269 BOARD-Te BOARDTe ABOARD-Te BOARD- An !BOARD- T (Pkg. 2) RESISTOR150,000 ohma 1 W. carbon (R-158) RESISTOR80 ohms 2 W. carbon

43、(R-134) RESISTOR3300 ohmi 2 W- carboi (R-181) (Pkg. 5) RESISTOR39,000 ohms 2 W. carbon (R-I27) RESISTOR12.000 ohmi 3 W. carbon (R-119) RESISTOR220 ohm, X W. carbon (R-106, 110, 114) (Pkg. 5) RESISTOR270 ohm, X -W carbon (R-129) (Pkg. ) RESISTOR470 ohms X W. carbon (R-H8, 181) (Pkg. 5) RESISTOR1000 o

44、hms X W. carbon (R-102, 150. 152) (Pkg. 5) RESISTOR2200 ohms X W. carbon (R-124, 130 on HM-171, 153, 182) (Pk. 6) .ESISTOR2700 ohm, X W. carbon RQ.l271 (R-I09) (Pkg. 5) R3300 , .R-113) (Pkg. 5) RQ-1273 RESISTOR3800 ohma X W. carbon RESISTOR . ohmi X W. carbon RQ-1283 RQ-1285 RQ-1289 i) W. carbon (R-

45、117, 123, 190, 203) (Pki. 6) RESISTOR10.000 ohmi X (R-164) (Pkg. 6) RESISTOR-12,000 ohmi X W. carbon (R-116) (Pkg. 6) RESISTOR18.000 ohm X W, carbon (R-101, 195) (Pk|. 5). Stock No RC-132 RC-133 RC-134 RC.I47 RC-157 RC-192 RC-213 RC-220 RC-224 RC.227 RC-232 RC-235 RC-238 RC-242 RC-246 RC-274 RC-293

46、RC-429 RC-S98 RC-1895 RC-5138 RQ-1335 RQ-1339 RQ-1341 RQ 1348 RQ-1420 RQ-1480 RQ-1461 RQ-I47I RQ-1475 RQ-1476 RQ-1485 RQ-1489 RQ-1499 RS-I79 RS-2S2 RS-257 RS-265 RS-1011 RS-1803 RT-471 RT-954 RW-101 RW-112 RX-062 rizcd Dealer) Descripti CAPACITOR0.1 mfd. 2000 V. papei (C-58) .CAPACITOR.06 mfd. 2000

47、V. papei I (C-57) ICAPACITOR0.1 mfd. 1000 V. papei ! (C-65) iCAPACITOR.25 mid. 400 V. paper (C-47) CAPACITOR0.5 mfd. 200 V. papc C-63) CAPACITOR.003 mfd. 2000 V. papei (C-64. 66. 85, 86) ICAPACITOR 12 mmf mica (C-15) iCAPACITOR6 mmf- mica (C-83) ICAPACITOR22 mmf. mica (C-4, 21). ICAPACITOR82 mmf. mi

48、ca (C-79. 80)- JCAPACITOR47 mmf. mica (C-32. 95)- CAPACITOR100 mmf- mica (C-6. 46). CAPACITOR68 mmf. mica (C-54) . . . ICAPACITOR 150 mmf. mica (C-23) . JCAPACITOR 180 mmf micl (C-40) CAPACITOR330 mmf- mica (C-5, 8. 87) CAPACITOR470 mml. mica (C-92) CAPACITOR30 mid. 500 V wet elec trolytic (C-59. 60

49、) CAPACITOR R.P. padder (C-78) CLAMPAnt. coil mounting clamp (Pkg. 5) CAPACITOR20 mfd 25 V. 10 mid. 450 V., dry electrolytic (C-39, 77) RESISTOR1.5 megohms X W. carbon (R-191) (Pkg. 5) : . , . . RESISTOR22 megohms H W. carbon (R-125, 149. 155. 166, 186) (Pkg. 5) RESISTOR2.7 megohm X W. carbon! (R.147) (Pkg. 5) RESISTOR5.6 megohms H W. carbon! (R-173, 174. 187, 188) (Pkg. 5) RESISTOR33 ohms 1 W. carbon (R-141) RESISTOR 1200 ohms I W. carbon (R-122) RESISTOR1500 ohms 1 W. carbon (R-I76) RESISTOR3300 ohms 1 W. carbor (R-154) RESISTOR4700 oh