Zenith HF-46 Stereo Receivers Models MC7031, MC7041, MC7051 ...

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TEST POINTS A; FM.ANTENNA INTUT D; 1ST FMIF INPUT 2ND FMIFOUTPUT G; FM DETECTOR OUTPUT H; AM.RF. & IF. INPUT L; M; l»KHZ GAIN AM IF WPUT K; NOTE 1 ALL RESISTANCE VALUES IN OHM K:KILOHM , M:MEGOHM THE WATTAGE OF RESISTORS NOT SPECIFICALLY DESIGNATED IS 1/4 WATT UNLESS OTHERWISE 2 NOTED IN SCHEMATIC ALL CAPACITORS IN MF PF- PICOFARAD 3. THERE MIGHT BE SLIGHT CHANGES IN THE ACTUAL SET 4. ALL VOLTAGES ARE DC UNLESS OTHERWISE SPECIFIED O.C. VOLTAGES SHOWN ARE MEASURED FROM CHASSIS, WITH NO SIGNAL INPUT, LOUDNESS SWITCH IN "OFF" POSITION, LINE VOLTAGE 120V . AC USING A HIGH IMPIDANCE DIGITAL MULTIMETER. IMPORTANT SAFETY NOTICE WHEN SERVICING THIS CHASSIS, UNDER NO CIRCUMSTANCES SHOULD THE ORIGINAL DESIGN BE MODIFIED OR ALTERED WITHOUT PERMISSION FROM THE ZENITH RADIO CORPO RATION. ALL COMPONENTSSHOULD BE REPLACED ONLY WITH TYPES IDENTICAL TO THOSE IN THE ORIG INAL CIRCUIT. SPECIAL COMPO NENTS ARE USED TO PREVENT SHOCK AND FIRE HAZARD. THESE CRITICAL COMPONENTS ARE SHADED ON THE SCHEMATIC AND PARTS LIST FOR EASY IDENTIFICATION. IC VOLTAGES THIS CIRCUIT DIAGRAM MAY OC CASIONALLY DIFFER FROM THE ACTUAL CIRCUIT USED. THIS WAY, IMPLEMENTATION OF THE LATEST SAFETY AND PERFORMANCE IM PROVEMENT CHANGES INTO THE SET IS NOT DELAYED UNTIL THE NEW SERVICE LITERATURE IS PRINTED. IC 301 PIN MONAURAL STEREO 1 11.45 12 2 3.2 3.1 3 5.5 5.2 4 9.0 9.3 5 9.0 .3 6 13.7 0.7 7 0 0 8 0.04 .4 9 2.4 2.37 10 1.58 1.56 II 2.2 2.4 12 2.4 2.4 13 2.4 2.4 NOTE - SEE PARTS LIST FOR PRODUCTION CHANGES 14 3.3 3.2 AF BOARD TRANSISTORS VR CONTROL SWITCHES NO DE3CRPTI0N SWITCH: R404 VOLUME S 501 POWER (ON-OFF) 01401,1491 DFF AMP POSITIONS CONNECTIONS ARROW INDICATES MOVEMENT OF WIPER CORRESPONDING R406 BALANCE SI FUNCTION SELECTOR 01402 ,1492 CURRENT SOURCE 1. AM.(SHOWN) 5- 1 TO CLOCKWISE ROTATION OF SHAFT. R4I4 BASS (AM FM. PHONO AUX) 01403,1493 BIAS 2 FM 5-2 SWITCH CONTACTS HAVE BEEN ASSIGNED ALPHANUMERIC R4I7 TREBLE S2 AFC (ON-OFF) 01404,1494 01FF AMP 3. PHONO 5-3 DESIGNATIONS TO ASSIST SERVICE TECHNICIANS IN S3 MUTING (ON-OFF) 01406, 1499 PRE DRIVER 4.AUX. 5-4 CIRCUIT TRACING. S4 LOUDNESS (ON-OFF) QI406, 1456 BIAS S5 MODE (MONO-STEREO) 01407, 1457 PROTECTOR S6 HIGH FILTER (ON-OFF) 0I4O8, 1458 PROTECTOR S7 LOW FILTER (ON- OFF) S8 MONITOR (TAPE-SOURCE) S9 SPEAKER (OFF-A.B A B) SIO DE - EMPHASIS ( 75US - 25US ) 01409,1499 DRIVER 01410, l4«o DRIVER 01-411, 1461 OUTPUT 01412, 1462 OUTPUT MODEL MC7031 - SCHEMATIC 44
45 MODEL MC7031 - RF/IF/MPX/PHONO PREAMP CHASSIS WIRING AND COMPONENTS VIEWED FROM FOIL SIDE MODEL MC7031 - POWER AMP/POWER SUPPLY CHASSIS WIRING AND COMPONENTS VIEWED FROM FOIL SIDE
Page 1 and 2: SERVICE MANUAL STEREO RECEIVERS MOD
Page 3 and 4: INDEX *REFER TO MASTER INDEX FOR UP
Page 5 and 6: MODEL PRODUCT FEATURES SEE NOTES ON
Page 7 and 8: NOTE A - CABINET STYLE: C = Console
Page 9 and 10: TAPE UNIT FEATURES SEE NOTES BELOW
Page 11 and 12: PRODUCT FEATURES X OR LETTER DENOTE
Page 13 and 14: AM/FM/MULTIPLEX ALIGNMENT GENERAL T
Page 15 and 16: RF, IF, MPX AND AUDIO ALIGNMENT PRO
Page 17 and 18: STEP CONNECT GENERATOR TO DUMMY ANT
Page 19 and 20: FIGURE 3 - MODEL MC7041 - CHASSIS V
Page 21 and 22: NOTE: These lamps snap into clip ty
Page 23 and 24: FIGURE 10 - MODEL MC7051 - OUTPUT S
Page 25 and 26: NOTES 23
Page 27 and 28: AUDIO MODEL MC7031W (Cont') REFNO P
Page 29 and 30: AUDIO MODEL MC7031W (Cont') REF NO
Page 31 and 32: AUDIO MODEL MC7041 (Cont.) REF NO P
Page 39 and 40: NOTES 37
Page 41 and 42: MODELS MC7031, MC7041 - IC301 BLOCK
Page 43 and 44: MODEL MC7051 - IC301 BLOCK DIAGRAM
Page 45: MODEL MC7031 - DE-EMPHASIS SWITCH C
Page 49 and 50: TERMINAL VOLTAGE OF AF-BOARD TRANSI
Page 51 and 52: 49 MODEL MC7051 - POWER SUPPLY CHAS
Page 53 and 54: IC 101 PIN NO VOLTAGE 1 5.1 V 2 2.2
Page 55 and 56: MODEL MC7051 - DIAL LIGHT CHASSIS W
Page 57 and 58: TEST POINTS A FM ANTENNA INPUT D FM
Page 59 and 60: S 501 POWER SWITCH S 1 FUNCTION SWI
Page 61 and 62: 59 MODEL MC7051 - EXPLODED VIEW

Zenith HF-46 Stereo Receivers Models MC7031, MC7041, MC7051 ...

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