Tele-Tone-TV-208-Sams-90-11电路原理图.pdf

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1、PHOTOFACT* Folder TELE-TONE MODEL TV-2O8 / HORIZ. HOLD CONTROL VERT HOLD CONTROL VOLUME CHANNEL BRIGHTNESS CONTROL SELECTOR CONTROL OFF-ON-5W. CONTRAST CONTROL TRADE NAME Tele-Tone Model TV-208 MANUFACTURER Tele-Tone Radio Co., 540 W. 58th St., New York 19, N. Y. TYPE SET Television Receiver TUBES T

2、wenty Two POWER SUPPLY no - 120 Volts AC - 60 Cycle TUNING RANGE- Channels 2 thru 13 RATING .95 Amp. 117 Volts AC INDEX Alignment Instructions 6 Block Diagram 16 Fine Tuning Drive Cord Stringing 15 High Voltage Oscillator Adjustment 15 Parts List and Description 12,13,14 Photographs Cabinet-Rear Vie

3、w 15 Capacitor Identification (RF-IF Chassis) 4 Capacitor Identification (Sweep Chassis) 10 Photographs (continued) Chassis-Top View RF Tuner . Resistor Identification (RF-IF Chassis) Resistor Identification (Sweep Chassis) Schematic Tube Placement Chart Voltage and Resistance Measurements . . 3 7 9

4、 11 .2 5 0-4 o p 1*1 O oo HOWARD W. SAMS & CO., INC. Indianapolis 1, Indiana The listing of any available replacement part herein does not constitute in any case a recommendation, warranty or guaranty by Howard W. Sams & Co., Inc., as to the quality and suitability of such replacement part. The numb

5、ers of these parts hove been compiled from information furnished to Howard W. Sams & Co., Inc., by the manufacturers of the particular type of replacement part listed. Reproduction or use, without express permission, of editorial or pictorial con- tent, in any manner, is prohibited. No patent liabil

6、ity is assumed with respect to the use of the information contained herein. Copyright 1950 by Howard W. Sams & Co., Inc., Indianapolis 1, Indiana, U. S. of America. Copyright under In- ternational Copyright Union. All rights reserved under Inter-American Copyright Union (1910) by Howard W. Sams & Co

7、., Inc. Printed in U. S. of America DATE 3-50SET 90 FOLDER 11 RadioFans.CN 360 -T-MMP THE COOPERATION OF THE MANUFACTURER OF THIS RECEIVER MAKES IT POSSIBLE TO BRING YOU THIS SERVICE MFD - MFD - MFD A PHOTOFACT STANDARD NOTATION SCHEMATIC Howard W. Sams & Co., Inc. 1950 PAGE 2 RadioFans.CN SOUND IF

8、AMP. AUDIO OUTPUT 6AU6_,7F 6AU RadioFans.CN H.V.05C. ()12SN76T WJ- J60 Z5 CONTRAST * CONTROL (Effl 1 4bK _L 30 VvVV i WFO BRIGHTNESS = 1 CONTROL 1f illllTI i M ( VERT.CENT. 5 HOR Jy, r f Z.CENT. S (g)J (g) .01 y. Low side to chassis. SOUND IF ALIGNMENT USING AM SIGNAL GENERATOR SIGNAL GENERATOR FREQ

9、UENCY 4. SMC (Unmod. ) CHANNEL Any channel unused locally. CONNECT VTVM DC Probe to Point Common to chassis. DC Probe to Point C. Common to chassis. ADJUST A5, A6 A7 ADJUST REMARKS Check for response curve similar to Fig 1 with proper marker placement. If necessary retouch Al and A2 to correct the l

10、ow frequency end, and A3 and A4 to correct the high freq- uency end of the response curve. ND VTVM REMARKS Adjust for maximum deflection. Adjust for zero reading. A positive and negative read- ing will be obtained on either side of the correct setting. SOUND IF ALIGNMENT USING FM SIGNAL GENERATOR AN

11、D OSCILLOSCOPE Use frequency modulated signal with 60 * modulation and 450KC sweep. Use 120 * sawtooth voltage in scope for horizontal deflection. DUMMY ANTENNA . 01MFD .01MFD SWEEP GENERATOR COUPLING High side to pin 1 (Grid) of 6AU6 (V8). Low side to chassis. SWEEP GENERATOR FREQUENCY 4. SMC (IMC

12、SWP) MARKER GENERATOR FREQUENCY 4. SMC CHANNEL Any channel unused locally. CONNECT SCOPE f rt. Amp. to Point Low side to assis. f rt. Amp. to Point Low side to issis. ADJUST A5,A6 A7 REMARKS Adjust for maximum amplitude and symmetry as per Fig 2. Adjust A7 so 4. SMC occurs at center of crossover lin

13、es as per Fig 3. SLIGHTLY retouch A6 for maximum amplitude and straightness of crossover lines. OSCILLATOR ALIGNMENT The RF and mixer circuits in this tuner are pre-set at the factory and are very stable and normally should not require adjustment in the field. Set the fine tuning control to the mid-

14、position of its range. DUMMY ANTENNA Direct SWEEP GENERATOR COUPLING High side to center con- ductor of antenna input cable. Low side to outer shield. SWEEP GENERATOR FREQUENCY 57MC (10MC SWP) 63MC (10MC SWP) 69MC (10MC SWP) 79MC (10MC SWP) 85MC (10MC SWP) 177MC (10MC SWP) 183MC OOMC SWP) 189MC (10M

15、C SWP) 195MC (10MC SWP) OlMC (10MC SWP) 207MC (10MC SWP) 213MC (10MC SWP) MARKER GENERATOR FREQUENCY 55.25MC 59.75MC 61.25MC 65. 75MC 67. 2 SMC 71. 75MC 77.25MC 81. 75MC 83.25MC 87.75MC 175.25MC 179. 75MC 181.25MC 185.75MC 187.25MC 191. 75MC 193.25MC 197.75MC 199. 25MC 203.75MC 205. 25MC 209.75MC 21

16、1. 25MC 215. 75MC CHANNEL 2 3 4 5 6 7 8 9 10 11 12 13 CONNECT SCOPE Vert. Amp. to Point O AFAMP. V12 AUDIO OUTPUT V13 RATIO DET. Vll st Video IF Amp. V4 2nd Video IF Amp. V5 3rd Video IF Amp. V6 DC RFCT. SYNC. SEP. VERT. MULT. V14 HORIZ. SYNC. DISC. V16 HORIZ. AFC 1/2 V17 HORIZ. OSC. 1/2 V17 HORIZ. AMP. V18 HORIZ. OSC. V19 HV RECT. V20 LV RECT. M NEC. RECT. V BLOCK DIAGRAM RadioFans.CN