GE-HM-225B-HM-226B-Rider-TV1电路原理图.pdf

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1、TV PAGE 1-14 GE MODELS HM-225B, HM-226B GENERAL ELECTRIC CO. IMPORTANT NOTE COMBINATION TELEVISION AND RADIO RECEIVER MODEL HM-2268 CONSISTS OF THE TELEVISION RECEIVER MODEL HM-226B REVISED FOR NEW STANDARDS AND RADIO RECEIVER MODEL HM226-7A. ALIGNMENT REVISED FOR NEW STANDARDS TELEVISION ALIGNMENT

2、PROCEDURE The problem of aligning the several circuits in a television receiver is much more involved and requires more specialised equipment than the alignment of conventional radio receiv- ers. Fortunately, the use of stable components in carefully engineered circuits of wide-band characteristics

3、reduces to a minimum the necessity for alignment under normal operating conditions. Should alignment become necessary the follow- ing equipment will be needed: (A) For Video I.F. Alignment (1) Cathode ray oscilloscope (2) Wide-band sweep oscillator capable of sweep- ing from 7.5 to 15 MC. (3) Marker

4、system either provided in sweep oscil- lator or from separate signal generator for locating 12.75 and 9.75 MC points. (B) Sound I.F. Alignment (1) Cathode ray oscilloscope (2) Wide band sweep oscillator capable of sweep- ing from 7.75 to 8.75 MC. (C) R.F. Alignment (1) Cathode ray oscilloscope (2) W

5、ide-band sweep oscillator capable of sweep- ing the following bands. (a) 50 to 56 MC (d) 78 to 84 MC (b) 60 to 66 MC (e) 84 to 90 MC (c) 66 to 72 MC VIDEO I. F. ALIGNMENT Input Freq. 1. 2. 7.5-15MC Sweep Point of Input Control grid of 6AB7 (2nd video I.F AdjustmentiComments Connect vertical input ca

6、ble of cathode ray oscilloscope across resistor R-43 of HH(i video detector. Connect low output tap of video I.F. sweep oscillator to control grid of GAB7 (2nd video I.F.). Connect ground lead to chassis. Turn contrast control (R-67) to about half of maximum or to a point which gives satisfactory ve

7、rtical deflection without overloading. Set horizontal centering and gain controls on oscilloscope to give suitable horizontal deflection. Adjust sweep phase to give curve simi:. r to Fig. 8, curve 2. NOTK: If sweep oscillator has marker points internally supplied, steps 3 and 4 may be omitted. 3. Sa

8、me as in No. 2 plus 12.75 MC 4. Same as in No. 2 plus 9.75 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. 7.5-15 MC Sweep 10. 1-4.25 MC 11. 8.25 MC Same as in No. 2 Same as in No. 2 Control grid 6AC7 (4th video IF) Control grid 6AB7 (3rd video IF) Control grid 6AB7

9、 (2nd video IF) Control grid of 6AC7 (1st video I.F.) Converter Grid, 6F8G Converter Grid, 6F8G Converter Grid, 6F8G Iron cores of detector transformer T-9 Iron cores of 4th video transformer T-8. Iron cores of 3rd video transformer T-7. Iron cores of 2nd video transformer T-fl Iron cores of 1st vid

10、eo trans- former T- 1 1 Series iron core of 2nd video transformer T-0 Series iron core of 3rd video transformer T-7 Superimpose an accurately calibrated 12.75 MC signal in parallel wilh sweep signal. Signal will appear on sweep curve in oscilloscope as a wiggle, the center of which is a thin black l

11、ine. With a pen or crayon mark this point on the screen of the oscilloscope. (NOTE: Hereafter the horizontal controls on the oscilloscope must not be touched.) Superimpose an accurately calibrated 9.75 MC signal in parallel with sweep signal. Mark screen at point where signal appears on curve as in

12、No. 2 above. Connect high tap of video I.F. sweep oscillator to control grid of 6AC7 (4th video I.F.). (Do not touch horizontal controls of oscilloscope.) Turn sweep phase to give as near a single curve as possible. Adjust iron cores of T-9 until curve appears similar to Fig. 8, curve 1, with relati

13、vely flat top, 12.75 MC mark half-way down one side and 9.75 MC mark at corner of other side. These conditions plus maximum amplitude insure correct alignment. Connect low tap of video I.F. sweep oscillator to control grid of 6AB7 (3rd video I.F.). Adjust iron cores for maximum gain, flatness and pr

14、oper centering between markers as described in step No. 5 and illustrated in Fig. 8, curve 1. Connect low tap to grid. Adjust primary and secondary iron cores for maxi- mum gain, flatness and proper centering. Adjust series iron core for sharp cut-off on 9.75 MC side of curve. See Fig. 8, curve 3. C

15、onnect low tap to grid. Adjust primary and secondary iron cores for maxi- mum gain, flatness and proper centering. Adjust series iron core for sharp cut-off on 12.75 MC side of curve. See Fig. 8, curve 3. Connect low tap to grid. Adjust iron cores for maximum gain flatness and proper centering. 12.7

16、5 MC response must be equal to or slightly greater than 50% of the, maximum response as indicated in Fig. 8, curve 4. To check alignment of 14.25 MC trap proceed as follows: Connect low tap to grid. Reduce horizontal gain of oscilloscope to minimum. Adjust iron core for minimum line length. To check

17、 alignment of 8.25 MC trap proceed as follows: Connect low tap to grid. Reduce horizontal gain of oscilloscope to minimum. Adjust iron core for minimum line length. John F. Rider RadioFans.CN GE TV PAGE 1-1 S GENERAL ELECTRIC CO ALIGNMENT REVISED FOR NEW STANDARDS R. F. ALIGNMENT MODELS HM-225B, HM-

18、226B Si foal Input 1. 2. 50 to 56 MC sweep 3. 60 to 66 MC sweep 4. 66 to 72 MC sweep 5. 78 to 84 MC sweep 6. 84 to 90 MC sweep Point of Input Antenna terminals Antenna terminals Antenna terminals Antenna terminals Antenna terminals Adjustments Band width ad- justment coup- ling condenser (L-10), (C-

19、3), (C-8) (L-H), (C-4), (C-9) (L-12, (C-5), (C-10) (L-13), (C-83). (C-19) (L-14). (C-84), (C-20) Comment* Turn (C-2) in until tight, then open approximately j cf a turn. Connect oscilloscope to junction of R-20 and C-32. Open-circuit B+ ead of R-3 and short-circuit R-2. Depress band No. 1 push butto

20、n. Set tuning control to mid-rotation. Adjust L-10 until curve is centered between maximum horizontal sweep points. Adjust C-3 and C-8 for maximum amplitude. See Fig. 8, curve 4. Depress band No. 2 push button. Adjust L-ll for centering; C-4 and C-9 for maximum amplitude. See Fig. 8, curve 4. Depres

21、s band No. 3 push button. Adjust L-12 for centering; C-5 and C-10 for maximum amplitude. See Fig. 8, curve 4. Depress band No. 4 push button. Adjust L-13 for centering; C-83 and C-19 for maximum amplitude. See Fig. 8, curve 4. Qepress band No. 5 push button. Adjust L-14 for centering; C-84 and C-20

22、for maximum amplitude. See Fig. 8, curve 4. WAVE TRAP ALIGNMENT 1. 11.75 MC With modulation Antenna terminals Wave trap trimmer, C-88 Adjust for maximum dip in oscilloscope curve, with oscilloscope connected to diode load resistor R-43. AUDIO I.F. ALIGNMENT NOTE: In order to obtain frequency modulat

23、ion detection in the sound channel with good fidelity, the audio I.F. amplifiers must be aligned to give a satisfactory selectivity curve for slope detection. For this reason a sweep generator and oscilloscope are neces- sary to obtain the resultant curve shown in Fig. 8, curve 5. 1. 2. 8.25 MC with

24、 30% tone modulation 3. 7.75 to 8.75 MC Sweep 4. 7.75 to 8.75 MC Sweep Grid of 6P8G converter. Control grid of 6B8 Control grid of converter 6F8G Iron cores of all audio transformers Iron cores of audio IF transformers T2, T3 and T4. Connect vertical input cable of cathode ray oscilloscope between j

25、unction of R-4 and C-29 chassis. Align for maximum amplitude Superimpose an accurately calibrated 8.15 MC signal in parallel with sweep signal and mark center of beat wiggle on oscilloscope screen as in step 3 of Video IF alignment. Also obtain an 8.35 MC beat signal mark on the oscilloscope screen.

26、 The steep straight portion of the over-all audio IF response curve must extend between these limits. Adjust iron cores until curve has been shaped as shown by curve 5, Fig. 7. It is important that the steep side be straight between 8.15 and 8.35 MC. The more gradual slope on the other side should e

27、xtend from 8.35 MC to approximately 8.7 MC. Very few turns of the cores should be required to obtain the desired result. No more than 30% loss in peak over-all response should result from this process. Fig. 8. Television Alignment Curves 50 or illfhtly nils tide of cure tevc onl- lope 12.75C IMPORTA

28、NT NOTES OTHER SERVICE DATA NOT LISTED IS THE SAME AS FOR THE ORIGINAL TELEVISION RECEIVER. ?OR SERVICE DATA ON THE REGULAR RADIO CHASSIS OP THE COMBINATION TELEVISION AND RADIO RECEIVER MODEL HM-226B, SEE MODEL HH226-7A. : 8.15IC CHANGE IN CIRCUIT OPERATION The horizontal oscillator is a multi-vibr

29、ator with speed controlled by varying the small positive grid voltage through R-69. The horizontal pulses are passed through proper wave shaping and amplifier circuits to the horizontal deflection coils of the picture tube. Horizontal linearity is adjustable by varying R-91. Horizontal sweep size is

30、 controlled by R-60 in the plate circuit of the 6P8G. The series circuits across the primary and secondary of the 6AL6G output transformer damp the output transient. Damping is adjustable through R-100. John F. Rider RadioFans.CN TV PAGE 1-16 GE MODELS HM-225, HM-226-7A GENERAL ELECTRIC CO. Stock No

31、. Dwcription Stock No. Description TeUvision Chwaic Parti Common o Rxiio RB-OO8 RB-013 RB-023 Rfl-058 RB-OOO RB-096 RB-621 RC-007 RC-011 RC-023 RQ-1215 RQ-124I RO-1247 RQ-1251 BOARDTerminal board (2 lug) BOARDTerming bomrd (2 lug) OARDTerminal board (4 lug) BOARDTerminal board (8 lug) BOARDAnt. gnd.

32、 terminal board BOARDTerminal board (3 lug) BEZELPilot light betel BOARDTerminal board (2 lunt and 2 anchor lulu) CAPACITOR.001 mid. 1JOO V. paper (C-42) . CAPACITOR.002 mfd. 6OO V. paper (C-* CAPACITOR.005 mfd. 6OO V. paper (C-12. 14. 21. 22. 23. 24. 26. 28. 31. 32. 35. 37. 3, 40. 41. 43. 44. 4. 79

33、) CAPACITOR.01 mid. OO V paper (C-74. 85. CAPACITOR.02 mfd. OO V. paper (C-34. 67. 70) CAPACITOR.04 mfd. *OO V. paper (C-M) CAPACITOR.05 mfd. BOO V. paper (C-2. 44. 4. 53. 59. 6) CAPACITORO.I mfd. 2OO V. paper (C-251 . CAPACITORO.I mfd. 400V. paper (C-51 . 57) CAPACITOR.25 mfl. 400V. paper (C-87) CA

34、PACITORO r. mfd 100 V. paper (C-4*. 71. 73) CAPACITOR- -4 mm. mica L.P.K (C-18) CAPACITOR10 mmf. mica (C-50) CAPACITOR22 mmf. mica (C-52) CAPACITORM mmf. mica L.P.P. (C-15. 36). CAPACITOR150 mmf. mica (C-27. 47) CAPACITORISO mmf. mica L.P.P. (C-1X, 58) CAPACITOR220 mmf. mica L.P.P. (C-3) CAPACITOR33

35、O mmf. mica L.P.K. (C-30. S2). CAPACITOR470 mmf. mica (C-61) . . . CAPACITOR47 mmf. mica L.P.P. (C-l 1.1). . CAPACITOR5 mmf. mica L.P.P. (C-33) CAPACITORIK mmf. mica L.P.F. (C-7. I I ) CAPACITOR30 mfd. 450 V. wet electrolytic (C- 64. 68. 75. 7B. HO) CAPACITORCoupinn padder (C-2) CLAM!Ant. trar.sform

36、er clamp (Pki. 5) CONE ASSEMBLY- 12 inch P.M. speaker cone assembly GRID CLIPtPSC control grid clip (Pkf. 5) KNOBControl knob and spring assembly (Pki;. 2) CHOKEFilter choke (L-25) BOARDSpeaker plug terminal boacd (Pk. 2) RESISTOR240 ohms 2 W. carbon *5t (R-71). . . RESISTOR270 ohms 2 W. carbon (R-3

37、5. 106) . . RESISTOR82O ohms 1 W carbon (R-50) RESISTOR15.000 ohms 2 W. carbon (R-46) . RESISTORM.000ohms2 W. carbon (K-90. 104) RESISTOR15 ohms H W. carbon (R-20) (Pkg.o). RESISTOR180 ohms A W. carbon (R-38. 108) (PkK. 5) RESISTOR33O ohms A W. carbon (R-89) (Pltg. 5) RESISTOR470 ohms H W. carbon (R

38、-40) (Pkg. 5) RQ-I2SB RO-1283 RO-1267 RO-12W RO-1271 RQ-1275 RQ-I27S RQ-1283 RO-1293 RQ-1299 RO-1307 RO-1313 RO-1315 RO-1323 RO-1331 R0-i-i:t RQ-1355 RQ-1457 R(J-143 RO-I4BI R0-147 RO-I5IO RU-1530 RO-litO RS-217 RS-252 RS-257 RS-2S7 RS- KK:i RT-954 RW-101 RW-II2 RX-030 RX-063 RESISTOR10OO ohms H W.

39、carbon (R-l. 7. 5. 7.1) (Pta. 5) RESISTOR1SOO ohms X W. carbon (R-19. 33) (Pkg 5) RESISTOR2200 Dhms K W. carbon (R-2. 9. 15. 17.2C, 25. 31.36. :I7.3) (Pk.5) RESISTOR2700 ohms M W. carbon (R-21. 27) (Pk*. 5): RESISTOR3300 ohms H W. carbon W. carbon (R-26. 42. 47. 58. 98. 107) (Pkt:- 5) RESISTOR27,000

40、 ohms Y, W. carbon (R-5, 41) (Pkv- 5) RESISTOR47.000 ohms H W. carbon (R-4. 12. W. 54) (Pkg. 5) RESISTOR100,000 ohms i W. carbon (R-8, 14. 102) iPkK. 5) RESISTOR180.000 ohms H W. carbon (R-13) (Pku. 5) : RBSISTOR 22O 000 ohms H W. carbon (R-l 1. 44. 81. 2. 63. 64. ftX. 78. H7) (PkK 5) RESISTOR470,00

41、0 ohms X W. carbon (R-49. 72. 9i 105) (Plu:. 5) RESISTOR1.0 meKohm W. carbon (R-6. 10. 34. 45. 55) (Pkt- 5) RBSISTOR2.2 megohms H W. carbon (R-57. 95) (PkK. 5) RESISTOR10 megohms H W. carbon (R-94) (Pkt- 5) I RESISTOR8JO ohms 1 W. carbon (R-66) . 1 RESISTOR-lO.OOOohms I W. carbon (R .). 24. 74). | R

42、ESISTOR22.000 ohms 1 W. carbon (R-97) ! RESISTORSS.OOO ohms I W. carbon (R-93) I RESISTOR100.000 odms 1 W. carbon (R-IO:i) . RESISTOR470.000 ohms I W. carbon (R-80) ! RESISTOR2.2 meuohms I W. carbon (R-, HI. 82. 8-l. 84. 86, 6) . SOCKET8792 X 2iube socket (Pk. 5) SOCKETOetal tub* socket SOCKET Elect

43、rolytic mounting socket SOCKET Pilot lii/hl socket SPEAKER 12 inc/i P.M. Speaker TERMINALSpeaker lead contact terminal (Pkg. 10) WASHER Pelt washer for control knob (Pltc. iO) . WASHERI.P. tuninx shaft tension aher (Pk(r. 10) ASSEMBLYSpeaker mounting aisembly ASSEMBLYElectrolytic mounting assembly (

44、washers and pal nuts) Television Chassis Parts Used in Television Only RTB-500 RTB-1502 RTB-1503 RTB-2001 RTB-2500 RTB-2501 RTC-1002 RTC-1003 RTC-2000 RTC-30OO RTC-3001 RTC-3O02 RTC-5O05 RTC-5007 RTC-5009 RTC-5011 RTC-5012 RTC-5O13 RTC-5014 RTC-5015 RTC-502S RTL-1003 RTL-1004 RTL-1005 RTL-1006 RTL-1

45、007 RTL-2002 RTL-2003 RTL-3003 RTL-3004 RTL-3005 RTL-3006 RTL-3007 RTX-4004 RT1-4O05 RTL-4O06 RTL-4007 RTL-5500 RTL-8000 RTN-001 RTP-001 RTP-002 R TO-1003 RTQ-1004 KEYStation selector key BACK COVERCardboard back cover for model HM-225 BACK COVERCardboard back cover for model HM-226-7A BUSHINGR.F. c

46、oil tuning bushing BRACKETRight R.P. unit support assembly. . . BRACKETLeft R.P. unit support assembly TRIM M ER STRIPFront station selector trimmer strip (C-8. 9. 10. 19. 20) TRIMMER STRIPTop station selector trimmer strip (C-3. 4, 5. 83. 84) CAPACITOR.06 mfd. 4OOO V. paper (C-77. 78) . . IAPACITOR

47、20 mfd. 25 V. 40 mfd. 450 V. dry electrolytic (C-39. 72) j CAPACITOR40 mfd. 25 V. dry electrolytic (C-62)i APACITOR10 mfd. 450 V., 5 mfd. 450 V . 20 mfd. 450 V. dry electrolytic (C-6. 54. 55. 65. 81). ONTROL100.OOO ohms horizontal speed control (R-69) . : CONTROL2.0 megohms vertical linearity or sue

48、 control (R-53. 65) CONTROL5OO.OOO ohms vertical speed control (R-79) 1ONTROL lO.OOOohms brightness or contrast con- trol (R-52. 67) CONTROL200 ohms 2 W. focus control (R-75). CONTROL1000 ohms horizontal linearity control (R-91) CONTROL0.5 megohm volurne or tone control (R-16. 23) CONTROLTuning cont

49、rol (C-17) CONTROL1000 ohm horiiontal size control (R-60) COILRP coil band No. 1 (L-5) COILRF coil band No. 2 (L-6) COILRP coil band No. 3 (L-7) ! COILRF coil band No. 4 (L-8) COILRF coil band No. 5 (L-9) COILConverter-oscillator plate coil (1M turn)1 (T-15) ! COILConverter-oscillator grid coil (1 turn) (T-15) COILOscillator tuning coil band No. 1 (L-10) . , . COILOscillator tuning coil band No. 2 (L-11) . . . . COILOscillator tuning coil band No.3(L-12). . , ! COILOscillator tuning coil band No. 4 (L-13) . . . . COILOscillator tuning coil band No. 5 (L-14) I CHOKEVideo choke (