Emerson 614 Service Manual
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Emerson 614 Service Manual

Emerson 614 Service Manual

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^Em erson Radio
7
e/eMcn,
SERVICE MANUAL
MODELS 6 1 4 -6 3 7 -6 4 4 -6 4 7 -648B
MODEL 61*
MODEL 644
MODEL 647
MODEL 637
MODEL 648B
Television Receivers
EMERSON RADIO AND PHONOGRAPH CORPORATION
Scanned by mbear2k - Jan 20121/17
111 EICHTH AVENUE
NEW Y O R K 11, N. Y,

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  • Page 1 MODELS 6 1 4 -6 3 7 -6 4 4 -6 4 7 -648B MODEL 61* MODEL 644 MODEL 647 MODEL 637 MODEL 648B Television Receivers EMERSON RADIO AND PHONOGRAPH CORPORATION Scanned by mbear2k - Jan 20121/17 111 EICHTH AVENUE NEW Y O R K 11, N. Y,...

  • Page 2: Table Of Contents

    Emerson Radio TABLE OF C O N TE N TS LIST OF TABLES Table D ESCRIPTION Page Page Par. Tube Complements __________ Receiver Characteristics _____ SECTION 1— GENERAL DESCRIPTION Adjustments Control Settings Generator Frequencies _____ ._______________________ Facilities ------ Audio I-F Alignment ________..._____________________...

  • Page 3: Section 1- General Description

    Hor. oscillator and discharge 6S N 7G T Vert, oscillator and discharge V 14 Model 614 is housed in a plastic cabinet, and Model 12AU 7 Sync sep. and d.c. restorer; 637 is contained in a wooden cabinet; both are table...

  • Page 4: Preparation For Installation

    Video — 25.75 MC. Intermediate Frequencies Audio — 4.5 MC. Input Impedance 300 ohms, balanced Channel Selection Twelve position, rotary turret Models 614, 637 — Chassis Chassis Models 120110B Models 644, 647 — Chassis 120113B Audio Output 2.5 watts 9 J5220 OSCILLATOR FREQUENCY CH.2...

  • Page 5: Receiver Installation

    Emerson Radio RECEIVER INSTALLATION — Locate the re- 1) Turn the O FF-VO LU M E control a quarter- ceiver where a minimum of bright light falls directly turn clockwise to turn on the receiver. Set the on the screen, although complete darkness is not recom­...
  • Page 6 Emerson Radio Figure 3-2— Test Pattern Figure 3-3— Test Pattern Correctly Adjusted Tuning Misadjusted Figure 3-4— Test Pattern Figure 3-5— Test Pattern Excessive Contrast Excessive Brightness Figure 3-6— Test Pattern Figure 3-7— Test Pattern Vertical Hold Misadjusted Horizontal Hold Misadjusted Figure 3-8—...
  • Page 7 Emerson Radio 6) Rotate the BRIGH TNESS control to the max­ 12) After the receiver has been operating for some imum counter-clockwise position and then ad­ time, it may be necessary to readjust the T U N ­ just slowly clockwise until light is just visible ING control slightly for best picture quality.
  • Page 8 Emerson Radio TUNER — The r-f unit constitutes a separate various channels. A variable-dielectric type of sub-chassis of the receiver. This sub-chassis con­ condenser is used for fine tuning of the oscillator. tains the r-f amplifier, converter, and oscillator The output of the converter is conected to double­...

  • Page 9: Deflection Section

    Emerson Radio attenuate the audio i-f. An overcoupled i-f (T 4 ) to one diode section of V12 to differ from that of completes the amplifier stages and feeds the video the other and result in a d.c. bias voltage on the grid of the horizontal control tuoe ( V I l b ) .

  • Page 10: Chassis Removal

    Emerson Radio of retrace of horizontal scanning, the field built the output of the discriminator is amplified by V93, up in the .primary collapses and induces a high- ana tne audio output (V 10). voltage. This voltage is applied to the high-voltage...

  • Page 11: Electrical Deflection Adjustments

    Emerson Radio too close to the deflection yoke as the range of adjustment of the FOCUS control (R 55) will be limited. To center the raster for models provided with a “ wobble plate” and focus levers, proceed as fol­...

  • Page 12: Alignment Test Equipment

    Emerson Radio Proper adjustment of the H O R IZ O N T A L and 955282 V E R T IC A L L IN E A R IT Y controls, and the SIZE controls should result in test patterns in which the - A / W circles are round and the wedges are linear and equal.
  • Page 13 Emerson Radio Figure 5-3— Scheme Scanned by mbear2k - Jan 20121/17...
  • Page 14 Emerson Radio OUNO D IS C * itic Jbiagram, Chassis 120110B Scanned by mbear2k - Jan 20121/17...
  • Page 15 Emerson Radio Figure 5-7— Location o f Alignment Points AUDIO I-F ALIGNMENT: (Table V ). RESPONSE SIG N A L GENERATOR IN P U T M E ASU R IN G PROCEDURE STEP A D J U S T IN ST R U M E N T...

  • Page 16: Video I-F Alignment

    Emerson Radio VIDEO I-F ALIGNMENT: (Table VI). SIG N A I GENER AT O R IN P U T M E ASU R IN G RESPONSE STEP A D JU ST PROCEDURE CURVES IN ST R U M E N T...

  • Page 17: Voltage And Resistance Analysis

    Models ent. Different sweep frequencies are required at the 614, 637, and 644, during production. These changes scope to distinguish between the sync pulses. may be identified by code markings consisting of a tri­...
  • Page 18 Emerson Radio 9 5 5 2 9 7 DEFLECTION WAVEFORMS: (Table V II I). H O R IZ O N T A L VERTICAL TEST TUBE PEAK to PEAK PEAK to PEAK P O IN T LETTER V O LTA G E...
  • Page 19 Emerson Radio Figure 5-11— Deflection Circuit Waveforms CODE M A R K IN G — E : Part No. 925162, C21, lug on the terminal strip adjacent to the power C36, and C49; C49 (80 mfd.) is marked A, ^nd transformer;...

  • Page 20: High Voltage Power Supply, Chassis 120113B

    Emerson Radio 1) Added a single lug terminal strip between soc­ 2) Inserted C-17 (1500 mmf.) between pin 7 of V-8 and chassis. kets V-l and V -ll. Transferred junction of R-66 (4.7K ), R-67 CODE M AR K IN G — T R IA N G LE 4 W : Same (2.2K ), and C-53 (.001 mfd.

  • Page 21: Secondary Area Reception

    MEASURED TO C H A S S IS , WITH ALL FRONT CONTROLS COUNTER-CLOCKWISE AND REAR CONTROLS NORMAL; NO SIGNAL INPUT. Figure 5-13— Bottom View of Chassis CABINET PARTS LIST (Models 614, 637, 644, 647). PART N O . ITEM MODEL 614 MODEL MODEL 644...
  • Page 22 Emerson Radio PARTS LIST — Chassis 120110B, 120113B. LIST PRICE PART N O . DESCRIPTION SYM BOL PART N O . SYM BOL DESCRIPTION PRICE LIST 0 7 5 928006 1,500 mmf, 400V Pt. of 0 3 6 10 mf, 450V...

  • Page 23: Tuner

    Emerson Radio PARTS LIST — Chassis 120110B, 120113 B. (cont.) PRICE PRICE SYMBOL PART N O . DESCRIPTION DESCRIPTION SYM BOL PAR T N O . LIST LIST 15 megohm, *^w, ± 2 0 % > R-45 351492 R-106 340432 560 ohm, y2w, ±...

  • Page 24: Tube Complements

    Alignment procedure, circuit description and Power Supply. general information, will be the same as that given for Model 614 using chassis 120110B. EXPAN-SCOPE The Expan-Scope incorporates a remote switch with a 20 foot extension cord which enables the viewer to either watch a normal picture or one which is expanded both vertically and horizontally so that the center of the picture is enlarged.
  • Page 25 Emerson Radio SOUND D SOUWJ - i r AM P SOUND -I F L IM IT E R a AUDIO Fig. 2 —Schematic Diagram—Chassis 12 Scanned by mbear2k - Jan 20121/17...
  • Page 26 Emerson Radio dio Scanned by mbear2k - Jan 20121/17...
  • Page 27 Emerson Radio MODEL 648B P/ DESCRIPTION PAftTNO SYMBOL SYMBOL PART NO. DESCRIPTION .05 mf Paper, 400v 923062 C-23 708095 Peaking coil— 180 uh 10 mmf Mica, 400v 0 2 4 910130 708095 Peaking coil— 180 uh 1,500 mmf Ceramic, 400v...
  • Page 28 Emerson Radio JRTS LIST (Continued) ______________________________________________ ;___________________________________________ ______ , DESCRIPTION DESCRIPTION PART NO. PART NO. SYMBOL SYMBOL 100,000 ohm Carbon, 340972 340932 68,000 ohm Carbon, i/2w, — 10% R-97 R-44 15 megohm Carbon, y2w, ± 2 0 % y2w, ± i o %...
  • Page 29 N O T E T E L E V I S I O N R E C E I V E R S MODELS 614,, 637, 644, and 647 CHASSIS MODELS 1201 IOC and 120113C I. GENERAL The models listed have been revised both mechanically and electrically. The major mechanical change is the conversion to two dual-controls in place of the original arrangement of four dual-controls.
  • Page 30 Fig. 4— Automatic Tuner— Part No, 470605 6. PICTURE TEAR Code markings, Triangle 8, on B series chassis, and Triangle 1 on C series chassis refer to the same circuit modifications to eliminate picture tear. These markings include all previous revisions, plus the following circuit changes: Removed R-27 (33K, 1 watt).
  • Page 31 SOU! SOUND - I F A M P SO U N D -! f L IM IT E R < 0 £ tig . 3— Schematic D Scanned by mbear2k - Jan 20121/17...
  • Page 32 \a%ram— Chassis 120113C Scanned by mbear2k - Jan 20121/17...
  • Page 33 / N E C H E L S E A 2 - 1 8 0 0 C A B L E A D D R E S S . E M P H O N O C O N E W Y O R K C O D E S B E N T L E Y S...
  • Page 34 923110 .005 mf ., paper, +/- 10%, 600 volts In service note for 614, 637, 644, 647 page 20, item K, this should read vertical output transformer, (T-llj instead of horizontal output transformer (T-9). Scanned by mbear2k - Jan 20121/17...
  • Page 35 H O N E C H E L S E A 2 - 1 8 0 0 C A B L E A D D R E S S , E M P H O N O C O N E W Y O R K C O D E S B E N T L t Y S...
  • Page 36 #925166 instead of #925161 for C-39, C-Ul, C-7U so note this on parts list for these chassis. All 120110C andl20113C chassis use the #925166 electrolytic condenser, therefore, correct the addendum part list for these chassis. Very truly yours, EMERSON RADIO PHONOGRAPH CORPORATION & George Cohen General Manager of parts...
  • Page 37 #925165 80 mfd. - 250 7 DC 80 mfd. - 250 7 DC O 10 mfd. - U50 7 DC A 7ery truly yours, EMERSON RADIO & PHONOGRAPH CORPORATION George Cohen General Manager of Parts 0Ci7A Sales & Service Division Scanned by mbear2k - Jan 20121/17 A G R E E M E N T S A N D S A L E S S U B J E C T T O S T R I K E S .

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