Emerson-614-637-644-647-manual电路原理图.pdf

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1、Emerson Radio SERVICE MANUAL MODELS 614-637-644-647 MODEL 614 - . MODEL 644 MODEL 637 MODEL 647 Television Receivers EMERSON RADIO AND PHONOGRAPH CORPORATION 111 EIGHTH AVENUENEW YORK 11r N. Y, RadioFans.CN Emerson Radio Par. TABLE OF CONTENTS SECTION 1GENERAL DESCRIPTION Page 1 Facilities 3 2 Speci

2、fications 4 SECTION 2INSTALLATION LIST OF TABLES Table DESCRIPTION Page I Tube Complements 3 II Receiver Characteristics 4 III Adjustments Control Settings 11 IV Generator Frequencies _._ 14 V Audio I-F Alignment 15 VI Video I-F Alignment 16 VII Tuner Alignment .-. 17 VIII Deflection Waveform Test P

3、oints 18 3 1 2 1 ? 3 4 5 6 7 1 ? 3 4 6 7 8 ft in 11 T 13 SECTION 3 OPERATION SECTION 4 CIRCUIT DESCRIPTION General . Tuner Video Section . _ _ . Deflection Section ,. , _ _ Power Supplies Intercarrier Sound Deflection Yoke and Focus Coil Assembly SECTION 5 MAINTENANCE AND ALIGNMENT Chassis Removal .

4、 Kinescope Replacement Mechanical Deflection Adjustments . ._, Electrical Deflection Adjustments . Alignment Test Equipment - Alignment . ., . . Voltage and Resistance Analysis ; Deflection Circuit Waveforms Production Changes Secondary Area Reception Cabinet Parts List Chassis Parts List 4 4 5 5 5

5、7 8 8 9 9 10 10 10 10 10 10 11 14 14 17 17 19 21 21 22 Fig. 1-1 1-2 1-3 3-1 3-2 3-3 3-4 3-5 3-6 3-7 3-8 3-9 4-1 4-2 5-1 5-2 5-3 5-4 5-5 5-6 5-7 5-8 5-9 5-10 5-11 5-12 5-13 LIST OF ILLUSTRATIONS DESCRIPTIONPage Front View of Chassis 120098B 3 Tube Location Diagram 4 Video, Audio, and Oscillator Frequ

6、encies 4 Front Panel Controls _. 5 Test Pattern, Correctly Adjusted 6 Test Pattern, Tuning Misadjusted 6 Test Pattern, Excessive Contrast 6 Test Pattern, Excessive Brightness 6 Test Pattern, Vertical Hold Misadjusted 6 Test Pattern, Horizontal Hold Misadjusted 6 Test Pattern, Focus Misadjusted 6 Tes

7、t Pattern, Weak Signal 6 Block DiagramChassis 12O110B, 120113B 7 Schematic Diagram of Tuner 8 Deflection Yoke and Focus Coil Adjustments Combined Mechanical and Electrical Centering 11 Focus Coil Adjustments, Mechanical Centering 11 Schematic Diagram Chassis 120110B 12,13 Rear Deflection Adjustments

8、 14 Generator Matching Network 14 Scope Detector Network 14 Location of Alignment Points 15 Tuner Alignment Points 16 Side View of Tuner 17 Voltage and Resistance Diagram 18 Sweep Circuit Waveforms 19 High Voltage Power Supply, Chassis 120113B 20 Bottom View of Chassis 21 RadioFans.CN Emerson Radio

9、Section 1. GENERAL DESCRIPTION 1. FACILITIESEmerson Models 614, 637, 644, and 647 are wide-band video receivers, providing di- reci-view high-definition pictures on ten or twelve-inch electro-magnetic deflection kinescopes. All models in- corporate several design features including intercarrier soun

10、d, AFC in the horizontal sync circuits, automatic gain control, a series-type transformer power supply, and internal antennas. Models 614 and 637 employ Chassis 120110B; Models 644 and 647 use Chassis 120113B. Both chassis are basically alike; the latter is modified to accommo- date the larger kines

11、cope, type 12LP4 or 12QP4. Model 614 is housed in a plastic cabinet, and Model 637 is contained in a wooden cabinet; both are table model receivers using a type 10BP4 picture tube. Model 644 is housed in a table model cabinet; Model 647 uses a consolette-type of cabinet. 2. SPECIFICATIONS a. TUBE CO

12、MPLEMENTS: (Table 1). NOT!1: The tube complements of both chassis are alike, except for the kinescope. Chassis 120113B uses type 12LP4 kinescope; some chassis may be equipped with a type 12QP4. SYMBOL Vl V2 V3 V4 V5 V6 V7 V8 V9 V10 Vll V12 V13 V14 V15 V16 V17 V18 V19 V25 V27 V28 V29 TT TRP 1 . I M -

13、 TYPE 6AG5 6AG5 6AU6 6AL5 6AU6 12AU7 6AU6 6AU6 6T8 6V6GT 6SN7GT 6AL5 6SN7GT 6SN7GT 12AU7 6K6GT 6BG6G 1B3GT 6W4GT ) 10BP4* or 112LP4# 6J6 6AG5 FUNCTION First video i-f amplifier Second video i-f amplifier Third video i-f amplifier Video detector and AGC First video amplifier Second video amplifier; s

14、econd sync amplifier Sound i-f amplifier Sound limiter Sound disc, and audio amp. Audio output Hor. phase invert.; horizontal control (d.c. amp.) Hor. phase det. (sync disc.) Hor. oscillator and discharge Vert, oscillator and discharge Sync sep. and d.c. restorer; first sync, amplifier Vertical outp

15、ut Horizontal output High-voltage rectifier Horizontal damper Kinescope Oscillator and converter R-f amplifier 5U4G Low- voltage rectifier * Chassis 120110B# Chassis 120113B WOBBLE PLATE LEVER LOW VOLTAGE POWER SUPPLY PICTURE CENTERING LEVER (FOCUS COII DEFLECTION YOKE C-2l,C-39,C-4l,C-74 HIGH VOLTA

16、GE POWER SUPPLY ON-OFF VOLUME AND CONTRAST AUDIO I- SECTION C-36.C-49 C-75 VERTICAL HOLD BRIGHTNESS AND HORIZONTAL HOLD VIDEO I-F SECTION TURRET TUNER SELECTOR AND FINE TUNING Figude 1-1Front View of Chassis 120110B RadioFans.CN Emerson Radio LOCATIONS Figure 1-2 Tube Location Diagram b. RECEIVER CH

17、ARACTERISES: (Table II). ITEM Voltage Rating Power Consumption Current Drain (At 117 volts a.c.) Frequency Range .Intermediate Frequencies Input Impedance Channel Selection Chassis Models Audio Output DESCRIPTION 105-125 volts, 60 cycles a.c. All models 190 watts All models 1.7 amps. 54-88 MC.; 174-

18、216 MC. Video 25.75 MC. Audio 4.5 MC. 300 ohms, balanced Twelve position, rotary turret Models 614, 637 Chassis 1201 10B Models 644, 647 Chassis 120113B 2.5 watts 9S53ZO OSCILLATOR FREQUENCY CHANNEL LIMITS 54 CHANNEL AUDIO CARRIER VIDEO CARRIER CH.2 CH.3 CH.4 81 67 93 7C 76 I CHS CH.6 103 109 3 . 1

19、i , 59.75Jr.71. I Is!6 5 I 81.7587.7 1 i 5 LOW BAND 55.25 61 25 67.2577.25 8325 OSCILLATOR FREQUENCY CHANNEL LIMITS CHANNEL AUDIO CARRIER VIDEO CARRIER CY 174 I 7 179. 180 CH.7 CH.8 201 207 CH.9 213 CH.IO CH.M CH.I2 CKI3 219 225 231 237 2O4 | 210 1 216 1 1 8 1 9 1 75185.75J.197.7 II 12 5 1 203.7520!

20、 I .75215 I 75 1 1 J HIGH BAND 175.2518125 187.25 193.25 199.25 205.25 211.25 Figure 1-3Video, Audio, and Oscillator Frequencies Section 2. INSTALLATION 1. PREPARATION FOR INSTALLATION All models are shipped complete, with the kinescope in place and all adjustments properly set. Present models are e

21、quipped with internal antennas and me- chanical deflection centering. Initial production mod- els do not include the built-in antenna and make use of combined electrical and mechanical centering. 2. ANTENNA INSTALLATIONChassis 12011013 and 120113B are designed to operate with high sensi- tivity and

22、will provide excellent reception in many areas with the internal antenna. If performance in a particular locality is unsatisfactory disconnect the internal antenna and install a portable or an outdoor antenna, depending on reception conditions. a. PORTABLE ANTENNA: Since surrounding buildings and ot

23、her objects can block out televi- 4 sion signals, an indoor antenna should be tried in different locations before deciding on a perma- nent position. Uncoil the. transmission line from the antenna base and connect to the terminals at the rear of the chassis. Tune the antenna, after turning on the re

24、ceiver and adjusting the con- trols, by rotating and varying the length of the telescopic arms for best reception. Both arms should be adjusted to the same angular position and extended to the same length. PERMANENT ANTENNA: For outdoor , an- tenna installations, use a dipole or an array with a comb

25、ination of elements. An Emerson Tele-Ray antenna is recommended, for best results. A 300- ohm transmission line is required for connection to the receiver. RadioFans.CN Emerson Radio 3. RECEIVER INSTALLATION Locate the re- ceiver where a minimum of bright light falls directly on the screen, although

26、 complete darkness is not recom- mended. Provide adequate ventilation by keeping the back of the receiver away from the wall. Do not ob- struct the ventilating slots at the rear of the cabinet. All models are provided with a protective enclos- ure for the end of. the kinescope. The enclosure is fast

27、ened to the rear of the chassis. Care should be ex- ercised during installation so as not to strike or jar the enclosure. After completion of antenna and power connec- tions, operate the receiver as outlined in Section III. If a receiver fails to operate, or if operation is unsat- isfactory, proceed

28、 with the following checks and ad- justments. CAUTJON Only experienced personnel should attempt to make these adjustments, as high voltage of ten kilovolts is present at the kinescope. a. MECHANICAL ADJUSTMENTS: For all models, remove the chassis back and check all tubes to make certain they are fir

29、mly seated in their sockets. Remove the kinescope enclosure and check the seating of the base plug. Inspect the high-voltage anode connector. The deflection yoke and focus coil have been prop- erly positioned at the factory. The kinescope should be seated back against the edges of the deflection yok

30、e assembly. Inspect the assembly to make certain that all adjustment wingnuts are tight. The ion trap should be positioned approximately over the two internal flags near the base of the kinescope. b. ELECTRICAL ADJUSTMENTS: An adapter line cord is required to operate the receiver for the following p

31、reliminary adjustments. 1) Turn the OFF-VOLUME control a quarter- turn clockwise to turn on the receiver. Set the BRIGHTNESS control a half-turn clockwise and turn the CONTRAST control countei- clockwise. Allow the tubes to warm up. 2) Set the SELECTOR control to an active chan- nel and adjust the T

32、UNING control for best picture quality. A test pattern is preferable for these adjustments. 3) Adjust the ion trap magnet by moving slowly forward or backward while rotating slightly around the neck of -the kinescope to obtain maximum picture brightness. Reduce the BRIGHTNESS control setting until t

33、he pat- tern is at7 approximately normal brilliancy. Ad- just the FOCUS control, at the rear oi the chassis, for maximum sharpness of raster lines. Then readjust the ion trap for maximum bril- liancy. 4) Adjustment of the deflection yoke assembly is required if the raster is not horizontal. Loosen t

34、he. center wingnut and rotate the assembly slightly to correct this condition. 5) Centering of the raster in the mask is con- trolled by both electrical and mechanical ad- justments, or by mechanical adjustments alone. If this adjustment is required, refer to Section V for operation of the chassis c

35、ontrols and po- sitioning of the focus coil. 6) All electrical adjustments at the rear of the chassis have been set at the factory. If the set- tings have been disturbed or if the kinescope requires replacement, they must be carefully readjusted in accordance with the procedure outlined in Section V

36、. Section 3. OPERATION 1. OPERATING CONTROLSThe operation and function of the front-panel controls is identical for all models. Seven controls are provided, as shown in fig- ure 3-1. 2. TUNINGTuning the receiver initially requires operation of the various controls as indicated. a. STATION SELECTION:

37、 1) Turn the OFF-VOLUME control clockwise approximately a quarter-turn. This turns the receiver on and sets the sound volume to a reasonable level. 2) Set theSELECTOR control so that the desired channel number is indicated on the edge of the control. This control may be rotated in either direction.

38、3) Allow approximately IS seconds for warmup. (This time is necessary to allow the tubes to attain the proper temperature for operation.) 4) If the desired station is-broadcasting, music or speech will be heard. Adjust the TUNING control for best picture quality. Readjust the VOLUME or desired sound

39、 level. 5) Rotate the CONTRAST control to its extreme counter-clockwise position. CONTRAST CONTROL: ADJUSTS PICTURE CONTRAST, LIGHT OR DARK. OFF-VOLUME CONTROL: TURNS RECEIVER ON AND ADJUSTS SOUND VOLUME. BRIGHTNESS CONTROL: ADJUSTS PICTURE AVERAGE BRIGHTNESS. HORIZONTAL HOLD CONTROL STOPS HORIZONTA

40、L MOTION OF PICTURE. VERTICAL HOLD CONTROL. STOPS VERTICAL MOTION OF PICTURE INDICATOR CONTROL; SELECTS STATIONS. FINE TUNING CONTROL ADUSTS RECEIVER FOR BEST PICTURE Figure 3-1front Panel Controls RadioFans.CN Emerson Radio Figure 3-2Test Pattern Correctly Adjusted Figure 3-4Test Pattern Excessive

41、Contrast I ,r ., V -f m_ . Figure 3-3Test Pattern Tuning Misadjusted Figure 3-5Test Pattern Excessive Brightness Figure 3-6Test Pattern Vertical Hold Misadjusted Figure 3-7Test Pattern Horizontal Hold Misadjusted Figure 3-8Test Pattern Focus Misadjusted Figure 3-9Test Pattern Weak Signal RadioFans.C

42、N Emerson Radio 6) Rotate the BRIGHTNESS control to the max- imum counter-clockwise position and then ad- just slowly clockwise until light is just visible on the screen. Rotate in reverse direction un- til light just vanishes. 7) Adjust the CONTRAST control until a pic- ture appears on the screen a

43、nd desired con- trast is attained. A further reduction in the BRIGHTNESS control setting may improve the apparent contrast of the picture. 8) If the picture moves vertically or horizontally, make the adjustment indicated in steps 9 and/ or 10. 9).Adjust the VERTICAL HOLD control until the picture st

44、ops moving up or down. Proper operating setting of this control is in the cen- ter of the range over which the picture remains stationary. 10) Adjust the HORIZONTAL HOLD control until picture stops moving from side to side. 11) Readjust the CONTRAST control until the desired picture intensity is obt

45、ained. It may be necessary o readjust the BRIGHTNESS control slightly at the same time for optimum brilliance. 12) After the receiver has been operating for some time, it may be necessary to readjust the TUN- ING control slightly for best picture quality. 1). CHANGING STATION DURING OPERA- TION : 1)

46、 Set the SELECTOR control to the proper channel number. 2) Readjust the TUNING control if necessary to obtain best picture quality. 3) Readjust the CONTRAST control slowly un- til the desired picture quality is obtained. 4) Readjust VOLUME to suitable level. 5) Readjust BRIGHTNESS control for desire

47、d brilliancy. c. CHECKING OPERATION: The use of auto- matic frequency control in the sync circuits of the receiver makes readjustments of the VER- TICAL HOLD and HORIZONTAL HOLD controls infrequent provided the control set- tings for proper operation are not disturbed. Figures 3-2 through 3-9 indica

48、te correct and incorrect adjustment of the various controls. Proper operation may be obtained by operation of the associated control. Section 4. CIRCUIT DESCRIPTION 1. GENERAI-Chassis 120110B and 120113B are basically alike; the latter is modified to accommodate a 12-inch kinescope and contains some

49、 changes in the high-voltage power supply circuits. Both chassis con- tain twenty-three tubes including the kinescope and low-voltage rectifiers. The chassis use the intercarrier method of sound reception, with the 4.5 me. audio i-f produced by heterodyning the video and audio carriers at the output of the video detector. The various stages of the receivers are indicated in the block diagram, fig- ure 4-1. I05-I25V 60A C. v ; R-F t 6AC B 5 V-I5B 1ST SYNC AMP I2AU7 V-2 9 L.V. RECT. 5U4G V-2 CONVE 6. 7A 6 V-2 6J 78 ATOR B T 1 1 1 1 1 _J V- AUDIO 7 I-F AMP 64