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Summary of Contents for Zenith Radio Corporation 1WDA10
- Page 1 ERVICE MANUAL MODULAR AND CON OLE AUDIO PRODUCT ZENITH RADIO CORPORATION PART AND ERVICE DIVI ION 11000 EYMOUR AVENUE, FRANKLIN PARK, ILLINOI 60131 HF-34 OCTOBER, 1978 $2.00 23M-CPC PRINTED IN U.S.A. 923-927...
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Page 2: Safety Checks
he Se ee ^ech iioicM PRODUCT SAFETY SERVICING GUIDELINES FOR ALL AUDIO AMPLIFIERS AND RADIO RECEIVERS CAUTION : No modification of any circuit should be attempted. Do not use a line isolation transformer during this test. Use ervice work should be performed only after you are thoroughly an AC voltmeter having 5000 ohms per volt or more sen- <... - Page 3 INFORMATION PRIOR DATA ON PAGE CONTAINED IN ON PAGE OR MODEL OR MODEL CONTAINED IN HF 26 25WDR50 1WDA10 HF 26, 27 1WDA10Z1 HF 28 25WDR50Z1 HF 27 HF 28 1, 29,30 35WDR50 1WEA10 (Z1) HF 26, 28, 29 35WDR50Z1...
- Page 4 PRODUCT FEATURE EE NOTE ON PAGE 3 RECORD CABINET PEAKER OTHER FEATURE CHANGEF j IMPED. QTY. PART TAPE PEAKER MODEL STYLE MI C. PART COLOR MODEL TYPE AND IZE NUMBER PROVI ION ’ ROVI IOIX NOTE F NOTE A NUMBER NOTE E (In Inches) NOTE B...
- Page 5 PRODUCT FEATURE EE NOTE BELOW RECORD CABINET PEAKER OTHER FEATURE CHANGER IMPED. QTY. PART TAPE PEAKER MODEL TYLE PART MI C. AND IZE NUMBER PROVI ION MODEL TYPE PROVI ION COLOR NOTE A NOTE F NUMBER NOTE E Ohms) (In Inches) NOTE B NOTE C NOTE D...
- Page 6 RECORD CHANGER FEATURE EE NOTE BELOW CART RIDGE, TURN PRE TYLU TURN BA E PART MFG. MODE PEED RECORD TABLE MI C. NOTE 2 TABLE PLATE NUMBER CODE (TYPE) (TYPE) (TYPE) TACK (TYPE) ADAPTER DIA. COLOR COLOR COLOR INGRAM...
- Page 7 TAPE UNIT FEATURE EE NOTE BELOW CHANNEL ALC/FULL AUTO PART NO. MFG. MI C. FEATURE 8-TRACK/' MOTOR FEATURE NOTE F CODE ETTE NOTE B NOTE E NOTE D NOTE A NOTE C PLAY RECORD 169-506-01 AMI/ML 8-Track Full A2, C1, FF, I, M, DC/M Full P1,R...
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Page 8: General Information
GENERAL INFORMATION THEORY 3. Do not operate these amplifiers without their proper speaker load. From time to time Zenith includes the use of new components 4. Do not short out the audio output of either channel when and circuit applications in product design. Theory and expla nation of such components and circuits is included in various the amplifier is operating. - Page 9 FM/AM/M U LTIPLEX ALIGNMENT GENERAL made using the composite signal injected at the output ter minal of the Detector since there is always some phase shift These receivers have been properly aligned at the factory and occurring in the RF, IF or Detector circuits. As a result, normally will not require further adjustment.
- Page 10 RF, IF AND MPX ALIGNMENT PROCEDURE FOR CHASSIS 1WJR55 , 3WJR50,50Z, 3VVJR52, 52Z CONNECT INPUT CONNECT DUMMY ET DIAL VTVM/ IGNAL PURPO E GENERATOR ADJU T ANTENNA COPE TO FREQ. PREFERRED METHOD - WITH AM SWEEP GENERATOR NOTE ’ For AM IF Alignment Use AM Sweep Signal Generator Of 10 KHz Deviation, 60 Hz Modulation For Full Bandpass Display. Bandswitch In AM.
- Page 11 RF, IF, AND MPX ALIGNMENT PROCEDURE FOR CHASSIS 1WJR55,3WJR50,50Z, 3WJR52,52Z - Cont'd. CONNECT CONNECT INPUT DUMMY ET DIAL VTVM/ GENERATOR IGNAL ADJU T PURPO E ANTENNA COPE TO FREQ, NOTE For FM Detector Alignment Use A Signal Of 75 KHz Deviation, 1 KHz Modulation. Also Connect Generator Modulation Frequency To Scope Horizontal.
- Page 12 RF, IF AND MPX ALIGNMENT PROCEDURE FOR CHASSIS 15WJR29 CONNECT CONNECT INPUT DUMMY ET DIAL PURPO E VTVM/ IGNAL GENERATOR ADJU T ANTENNA COPE TO FREQ. NOTE: For AM Alignment Use A Signal With 400 Hertz Modulation, Bandswitch In AM. VTVM 455 KHz Gang...
- Page 13 RF, IF, AND MPX ALIGNMENT PROCEDURE FOR CHASSIS 15WJR29 - CONT'D. CONNECT INPUT CONNECT DUMMY ET DIAL VTVM/ IGNAL GENERATOR ADJU T PURPO E ANTENNA COPE TO FREQ. NOTE : Apply Sufficient Signal Level — Approx. 100 Microvolts — To Obtain Full Limitin g At Point Near 98 MHz. 300 Ohm Test Point "A ”...
- Page 14 KR902P KR912AE KR916PN KR919P KR920AE REPRE ENTATIVE MODEL ILLU TRATION...
- Page 15 AUDIO - 1979 During 1979, Zenith's 60th Anniversary year, a totally Detailed product feature charts for these categories new concept in Audio Products is being introduced to appear on the following pages. Service information for the consumer. In addition to the customary console the Integrated Stereo Systems, Integrated Stereo Re...
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- Page 19 £ Y DC xxiiixxxx XIII Illi £ • XIII Illi XIII Illi...
- Page 20 TABLE E - RECORD CHANGER FEATURE 1979 AUDIO PRODUCT LINE FEATURE - INTEGRATED TEREO AND MODULAR COMPONENT I 4020 I 4060 MODEL NUMBER RECORD I 4030 I 4070 MC9040 MC9020 MC9030 CHANGER I 4040 I 4080 FEATURE PRODUCT TYPE AM/FM/PHONO/TAPE PHONO PHONO PHONO...
- Page 21 TECHNICAL APPLICATION FIGURE 1 - MODELS MC1000, MC2000, MC3000 AND MC4000 Models MC3000 and MC4000 present new styling and several ALLEGRO SPEAKER SYSTEMS new features: 1. Removable grilles. Figure 1 illustrates .the four 1979 Allegro Speaker Systems. Models MC1000 and MC2000 are comparable to their "J Line 7 ' 2.
- Page 22 TABLE A - ALLEGRO PEAKER Y TEM MODEL 16 OHM 8 OHM E9012W, E9012W1, Allegro 1000 G1000W, G9012W1, H1000W, H1000W1, H1000W2, H1000W3, J1000W1, J1000W2, MC1000 E9014W, E9014W1, Allegro 2000 G2000W, G2000W11, G9014W, H2000W, E9014X,E9014X1 H2000W3, J2000W1, J2000W2, MC2000 G3000W, G3000W11, E9018W, E9018W1, Allegro 3000 FIGURE 4 - PUSH TYPE CONNECTOR...
- Page 23 TABLE B - SPEAKER ENCLOSURE S ZE "J" "G" "H" "K" 16-1/2" h, I8"h, 20-1/2" h, 20-1/2" h, 1000 V0-1/2" w, 10-1/2"w, 13-1/2" w, 13-1/2" w, 7-1/2" d 7-1/4" d 7-1/2" d 7-1/4" d 18-5/8" h, 20-5/8" h, 22-1/2" h, 22-1/2"...
- Page 24 FIGURE 8 - PILOT HOLES FIGURE 10 - SECURING NEW PANEL When removing the back, handle the acoustical pads care fully (they may tear easily). Speakers (and other components) must be securely fastened to prevent air leaks, and loose components can result in rattles.
- Page 25 CHASSIS 3WJR50, 50Z - CHASSIS WIRING AND COMPONENTS CHASSIS 3WJR50, 50Z - CHASSIS WIRING AND COMPONENTS VIEWED FROM FOIL SIDE - RF/IF/MPX VIEWED FROM FOIL SIDE - AUDIO AND POWER SUPPLY...
- Page 26 CHASSIS 3WJR50, 50Z - SCHEMATIC...
- Page 27 3WJR5O, 5OZ ITEM PART ITEM PART ITEM PART DE CRIPTION DE CRIPTION DE CRIPTION FM ANTENNA TRIMMER 22 7354-12 1000 MFD ELECT ROLYTIC 35V R480 63-1757 220 OHM 1 «D% 1/2W ( EE HEADPHONE CX503« FM ANTENNA TUNING CX504* 22-7431-07 01 MFD 150VAC JACK A 'Y )
- Page 28 CHASSIS 3WJR50, 50Z-CHASSIS LAYOUT...
- Page 29 CHASSIS 15WJR29 - CHASSIS LAYOUT...
- Page 30 I 15WJR29 ITEM PART ITEM PART ITEM DE CRIPTION PART DE CRIPTION DE CRIPTION R752 63-9921-72 IK OHM 15% 1/4W F.M. antei *> TRIMMER 63-9922-20 100K OHM 5% 1/2W (ALT 63-10184-20110% 1/4W) F.M. ANTEI JNA TUNING 63-9922-12 47K OHM ±5% 1/4W (ALT 63-10184-12110% 1/4W) R753 63-7949 8.2 MEG OHM ±5% 1/2W...
- Page 31 CHASSIS 15WJR29 - SCHEMATIC...
- Page 32 CHASSIS 15WJR29 — CHASSIS WIRING AND COMPONENTS CHASSIS 15WJR29 - CHASSIS WIRING AND COMPONENTS VIEWED FROM FOIL SIDE - POWER SUPPLY VIEWED FROM FOIL SIDE - POWER AMPLIFIER...
- Page 33 CHASSIS 15WJR29 - CHASSIS WIRING AND COMPONENTS VIEWED FROM FOIL SIDE - RF/IF/MPX...
- Page 34 CHASSIS 15WJR29 - CHASSIS WIRING AND COMPONENTS VIEWED FROM FOIL SIDE - PREAMPLIFIER...
- Page 35 CHASSIS 15WJR29 - CHASSIS WIRING AND COMPONENTS VIEWED FROM FOIL SIDE - MAGNETIC PHONO PREAMP...
- Page 36 HF-34...
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