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Zenith Radio Corporation Y547C Service Manual

High fidelity and stereo fm
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ERVICE MANUAL
IG
FIDELITY
AND STEREO FM MODELS
ZENIT RADIO CORPORATION
1900 N. AUSTIN AVENUE
C ICAGO, ILLINOIS 60639
PRICE $1.50
SUPPLEMENT TO
F 16
PART NO. 923-508

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  • Page 1 ERVICE MANUAL FIDELITY AND STEREO FM MODELS ZENIT RADIO CORPORATION 1900 N. AUSTIN AVENUE C ICAGO, ILLINOIS 60639 PRICE $1.50 SUPPLEMENT TO F 16 PART NO. 923-508...
  • Page 3 INDEX assis c assis parts LIST AYOUT SC EMATIC PAGE PAGE PAGE C ASSIS See HF 6 See HF 6 See HF 6 2NT20 See HF 6 2NT20Z 2 & 22 52 & 53 See HF 6 2NT2 52 & 53 See HF 6 2NT22 See HF 6...
  • Page 4 FEATURES OF IG FIDELITY & STEREO FM MODELS CABINET C ASSIS SPEAKER V.C. SIZE PART MODEL NO. STYLE MATERIAL FINISH COLOR MODEL TYPE POWER IMPEDANCE OUTPUT (IN OHMS) INCHES) YS47C Table Metal Vinyl Charcoal 8 Transistor 8YT20 22.0 2-4x6 (w/handle) Clad Lt.
  • Page 5 FEATURES OF IG FIDELITY & STEREO FM MODELS RECORD C ANGER REMOTE INDICATOR TAPE RECORD TYPE SPEAKER MOUNTING CARTRIDGE STYLUS LIG T DECK STORAGE SEE NOTE 69-338 Hinged 42- 48 None None None Panel 56-528 69-339 Hinged 42- 48 None None None Panel...

  • Page 6: General Information

    GENERAL INFORMATION FM CABINET ANTENNA MULTIPLEX T EORY All console models contain an FM antenna built into For all theory regarding the operation of the multiplex the cabinet. This antenna consists of a Folded Dipole circuits, refer to service manuals HF- 4 and HF- 4 cut to the desired frequency, and attached to the inter ­...

  • Page 7: Power Amplifiers

    Tuning the receivers on the frequency modulation band FM, RF, AND IF ALIGNMENT - C ASSIS 18YT21Z, will require more care than on the broadcast band. A 20YT20 AND 26YT20. hissing sound may be noted when tuning between Fre ­ Alignment of these chassis will, in most cases, not be quency Modulation stations.
  • Page 8 AM ALIGNMENT B. On chassis 8YT2 Z, 20YT20, and 26YT20 con ­ C. A V.T.V.M. on low AC scale connected across the nect the scope to the base of the last FM IF tran ­ speaker voice coil output terminals (either left or sistor Test Point (G).
  • Page 9 >- < F — >- — < z> F — < < □ <...
  • Page 10 C? 04 i-< 04 J — > OO *-4 04 04 <2 rC o 04 04 < £ < ■ < □ o> o> < r — 4...

  • Page 11: Preliminary Procedures

    to obtain S curve symmetry indicates it is most neces ­ MULTIPLEX ALIGNMENT PROCEDURE sary to adjust for maximum gain and at the same time C ASSIS 26YT20 maintain linearity and symmetry. 0.7 megacycles must be on the curve at the reference line. 0.5 mega ­...

  • Page 12: Trouble-S Ooting

    67 KC Trap Adjustment injected at the output of the ratio detector. To reduce possible extraneous signals coming through the ratio . Connect the stereo generator RF leads to the G detector, short the ratio detector primary with a jump ­ and F FM antenna terminals and set the pilot er lead.

  • Page 13: Parts List

    Speaker Enclosure-Left Side (Part of 4-8473) *43-930 * 69-339 Four Speed Record Changer (VM) Model Speaker Enclosure-Right Side (Part of 4-8473) *43-934 Y547C (See Changer Parts List For Volume Control Knob (2 Required) *46-6 9 Components) Tone Control Knob *46-6 2 ♦202-3038...
  • Page 14 PART NO. DESCRIPTION , PART NO. DESCRIPTION *80- 985 Lock Spring (2 Part of 4-8473) 95-2573 Power Transformer *83-6365 Guide Retaining Strip (2 Required) 4-657 8- 8 x 5/ 6 x ¥4 Hex Washer Hd. Self-Tap. *83-6369 Slide Strip-Top (Part of 4-8473) Screw-Stat Bronze (Used on 95-2573) *83-6370 Slide Stop-Bottom (Part of 4-8473)
  • Page 15 DESCRIPTION PART NO. DESCRIPTION PART NO. 80-209 Drive Cord Tension Spring 54-633 Transistor Socket Retaining Nut ( Used on 80- 40 Drive Cord Tension Spring Ea. 78- 442 & 78- 770) Shaft Retaining Spring 80- 467 56-426 Roll Pin (4 Required) 80- 468 Grounding Spring 56-5 2...
  • Page 16 PART NO. DESCRIPTION PART NO. DESCRIPTION 49-2 Iron Core (Part of S-66580) 22-5 67 000 MF Electrolytic Capacitor - 30V. 49-333 Iron Core Sleeve (2 required) 22-5 88 . MF Capacitor - 50V. 49-368 Iron Core & Spring 22-5249 . MF Capacitor - 00V. (2 req ’ d.) 49-385 Iron Core &...
  • Page 17 DESCRIPTION DESCRIPTION PART NO. PART NO* 03-23 Diode (5 required) 63-60 0 39 Ohm Resistor - W. 0% 03-47 Diode 270 Ohm Resistor - W. 0% 63-6045 03-74 Diode 560 Ohm Resistor - W, 0% (2 req ’ d.) 63-6059 03-96 Zener Diode 680 Ohm Resistor - W.
  • Page 18 PART NO. DESCRIPTION PART NO. DESCRIPTION C ASSIS 26YT20 58-246 Two Prong Plug-AC (Part of S-59959) *59-7 9 Dial Pointer 2-4209 Chassis Mtg. Bracket (2 req ’ d) 62-28 Fuse Holder 2-42 0 Shutter Bracket 63- 70 0 Ohm Resistor-ViW. 0% 2-42 Variable Capacitor Mtg.
  • Page 19 PART NO. DESCRIPTION PART NO. DESCRIPTION! 83-5284 Five Lug Terminal Strip 2 -333 Transistor-AM-RF-AM Mixer (2 83-5286 Eight Lug Terminal Strip required) 83-5288 Thirteen Lug Terminal Strip 2 -335 Transistor-AM Osc. 83-5289 Fifteen Lug Terminal Strip (2 required) 2 -347 Transistor- Bi-Plex Detectom 83-529 Insulating Strip...
  • Page 20 DESCRIPTION PART NO. DESCRIPTION PART NO. 2 -383 Transistor 63-42*83 220K Ohm Resistor-W. 0% * 2 -428 Transistor 63-42*97 470K Ohm Resistor-W. 0% Transistor 76- 54 Guide Shaft (2 required) * 2 -432 26- 4 Coil Shield (Side) 76- 542 Drive Shaft Coil Shield (Center) 26- 42...
  • Page 21 INDICATES W ITE OR YELB-OW VOICE COIL POLARITY IDENTIFICATION .OOT ON SPEAKER. SPEAKER WIRING FOR MODEL Y8530Wa Y8530W-I...
  • Page 22 INDICATES W ITE OR YELLOW VOICE COIL POLARITY IDENTIFICATION DOT ON SPEAKER SPEAKER WIRING FOR TV COMBINATION MODELS Y8550, Y8560, Y8570, Y8548, Y8563,Y8565,Y8568,Y8558...
  • Page 23 >- <✓5 < & < >...
  • Page 24 < <✓> >- < >...
  • Page 25 < *©...
  • Page 26 NOTES...
  • Page 27 NOTES...
  • Page 28 NOTES...
  • Page 29 NOTES: ALL RESISTORS ARE 1/2 WATT CARBON. ± 10% TOLERANCE UNLESS OT ERWISE SPECIFIED. FOR CAPACITY TOLERANCE (SEE LEGEND). f INDICATES ± 20% TOLERANCE TUNING RANGES: 540-1620K Z 88- 108 M Z FM AMP. MOD. I.F. FREQ: 455 K Z FREQ.
  • Page 30 ITEM PART ITEM PART DESCRIPTION DESCRIPTION 22-3035 12 PF DISC. ±5% 500 V 63-4143 100 O MS ±10% 1/4 W 22-4613 .001 F.T. 500 V 634199 2.2K O MS ±10% 1/4 W 22-5321 r36 PF DISC. ±5% 500 V 634196 1.8K O MS ±10% 1/4 W 22-4613...
  • Page 31 20YT20 SC EMATIC...
  • Page 32 ITEM PART ITEM DESCRIPTION PART DESCRIPTION 22-3177 390 PF DISC ±10% 63-6495 500 V POTENTIOMETER 22-4613 .001 F.T. 500 V 63-3238 POTENTIOMETER 50K 22-5321 36 PF DISC ±5% 500 V 63-6066 820 O MS +± 10% 22-4613 .001 F.T. ±20% 500 V 63-6045 270 O MS ±...
  • Page 33 TEST POINTS A F.M. ANTENNA INPUT B F.M. RF A.G.C. (FWD) C F.M. MIXER A.G.C. (REV.) D I ST. B 2 ND. I.F. INPUT E 3RD. I.F. INPUT F 4 T . I.F. INPUT G 4 T . I.F. OUTPUT 8 RATIO DET. INPUT F.M.
  • Page 34 PART ITEM PART ITEM DESCRIPTION DESCRIPTION 22-2720 1 F»F GIMMICK ±10% 500 V 63-5652 390 O MS ±10% 22-3652 .1 IMFD DISC 10 y 63-6361 LOUDNESS CONTROL (REAR) 22-3034 .05- MFD DISC 25 V LOUDNESS CONTROL (FRONT) 63-6363 TREBLE CONTROL (REAR) 22-2720 1 F»F GIMMICK ±10% 500 V...
  • Page 36 ZENIT RADIO CORPORATION 1 900 N. Austin Avenue C ICAGO, ILLINOIS 60639 923-508 F16 SUPP. RR 126730M PRINTED IN U.S.A.

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