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Zenith Y504B Service Manual

High fidelity and stereo fm models
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ERVICE MANUAL
IG
FIDELITY
AND STEREO FM MODELS
ZENIT RADIO CORPORATION
1900 N. AOSTIN AVENGE
C ICAGO, ILLINOIS 60039
PRICE $2.50
F 16
PART NO. 923-493

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  • Page 1 ERVICE MANUAL FIDELITY AND STEREO FM MODELS ZENIT RADIO CORPORATION 1900 N. AOSTIN AVENGE C ICAGO, ILLINOIS 60039 PRICE $2.50 F 16 PART NO. 923-493...
  • Page 3 INDEX HASSIS HASSIS PARTS S HEMATI LAYOUT LIST HASSIS PAGE PAGE PAGE 1N21 1Y20 2NT20 2NT20Z 2NT21 52 & 53 21& 22 2NT22 52 & 53 2YT23 3YT22 4NT22 6XT20 6YT01 62 & 63 23 & 24 6YT21 6YT24 24 & 25 8YT02 10NT01 25 &...
  • Page 4 TYPE (IN.) MODEL IMPEDANCE COLOR FINISH MATERIAL STYLE OUTPUT MODEL NO. 49-1096 1 Tube Phono Blue & Textured Plastic able Y504B Only White Plastic v/handle) (1 ift lid) 49-1096 1 Tube Phono LY20 Red& Textured Plastic 'able Y504D Only White...
  • Page 5 FEATURES OF IG FIDELITY & STEREO FM MODELS RECORD C ANGER (SEE NOTES) CONTROL INDICATOR TAPE RECORD REMOTE TYPE MOUNTING CARTRIDGE STYLUS PANEL LIG T DECK STORAGE SPEAKER Manual 142-161 Shelf Sapphire None None None None Player Manual Shelf 142-161 Sapphire None None...
  • Page 6 FEATURES OF IG FIDELITY & STEREO FM MODELS SPEAKER CHASSIS CABINET PART V.C. SIZE POWER MODEL TYPE COLOR MATERIAL FINISH (IN.) IMPEDANCE MODEL NO. STYLE OUTPUT 2-5x7 964-20082 8 Transistor Plastic Waters Metallic Mood X547P1 Table Phono Only Pale Gold 8s Conley Coated (w/handle)
  • Page 7 FEATURES OF IG FIDELITY & STEREO FM MODELS RECORD CHANGER (SEE NOTES) REMOTE RECORD INDICATOR TAPE CONTROL SPEAKER STORAGE DECK LIGHT PANEL STYLUS CARTRIDGE MOUNTING TYPE None None None Metal Sapphire 142-148 Hinged 169-275 Plate Sapphire Panel None None None Metal Diamond 142-162...
  • Page 8 FEATURES OF IG FIDELITY & STEREO FM MODELS CABINET C ASSIS SPEAKER PART v.c. SIZE MODEL NO STYLE MATERIAL FINIS COLOR MODEL TYPE POWER IMPEDANCE (IN.) OUTPUT Y928W Console Wood Wood Walnut 20YT20Z Phono-AM-FM 30W. 49-1094 2-3 1/2 (Sliding 49-1042 2-horn Doors) 49-1097...
  • Page 9 FEATURES OF IG FIDELITY & STEREO FM MODELS RECORD C ANGER (SEE NOTES) CONTROL INDICATOR TAPE RECORD REMOTE TYPE MOUNTING CARTRIDGE STYLUS PANEL LIG T DECK STORAGE SPEAKER 169-331 Shelf 142-163 Diamond Die-Cast Y633 S9014w Sapphire Escutcheon Y635W S9017w 169-331 Shelf 142-163 Diamond...
  • Page 10 FEATURES OF IG FIDELITY & STEREO FM MODELS SPEAKER C ASSIS CABINET SIZE PART MODEL TYPE POWER COLOR MATERIAL FINIS (IN.) MODEL NO. STYLE IMPEDANCE OUTPUT 49-1094 3 1/2 Walnut Wood Wood S9014W Table 49-984 11 x 14 49-1140 Wood Wood Wood Table...
  • Page 11 169-317 - (VM) BLACK & PEARL GRAY FINISH (X508B1) 169-331 - (VM) BRILLIANT ALUMINUM & BLACK. LARGE TURNTABLE 169-332 - (ZENITH) BRILLIANT ALUMINUM & BLACK. LARGE TURNTABLE 169-335 - (VM) GRAY & DARK GRAY FINISH. 169-336 - (VM) IVORY & CHARCOAL BROWN FINISH.

  • Page 12: General Information

    Supplement. cut to the desired frequency, and attached to the inter ­ nal periphery of the cabinet. EXTENSION SPEAKER SYSTEMS It is recommended that only Zenith extension speakers SIGNAL STRENGT C ART be used in conjunction with Zenith receivers. However,...
  • Page 13 Tuning the receivers on the frequency modulation band INTEGRATED CIRCUIT (I C ) 221-32 SstS'XXyTnX XJ VaXSeXp.* T, »,T “ • ° 22 « 2 to ■»«. K".it -J quench RfoddatlM stations This is noXTaS disappear as the station is tuned in. After a station is voltac^ di n „M £»...
  • Page 14 B. On chassis 18YT20, 20YT20, 26YT20 and 26YT21 connect the scope to the base of the last FM IF transistor Test Point (G). The common scope termi ­ nal should be connected to chassis. On chassis 23YT124 the scope should be connected Scope P to terminal #5 of T4 the 4th I.F.
  • Page 15 TF o O T-l CN 04 04 04...
  • Page 16 V — I —4 i — ( T — < LO O i-l CM < v — I...
  • Page 17 1 — co T — ' 4 <N v-M z> < v — < r-4...
  • Page 18 00 ’ "■< CN 04 T — < CN r-M □ — < < >0 r — 4...

  • Page 19: Preliminary Procedures

    Using the Zenith FM multiplex signal generator, the cycles and 10.9 megacycles must be at the lower and multiplex portion of Zenith or any FM multiplex re ­ upper turn of the S curve respectively. Only when the ceiver can be aligned, but first before any attempt is I.
  • Page 20 injected at the output of the ratio detector. To reduce 67 KC Trap Adjustment possible extraneous signals coming through the ratio 1. 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 e r lead.

  • Page 21: Parts List

    PARTS LIST PART PART F ’ RICE DESCRIPTION DESCRIPTION PRICE 79-174-8 #18 Sleeving - Yellow • 1 ” C ASSIS 1N21 PARTS 79-209-8 #22 Sleeving* Yellow • 1 ” (Part of 11-145 Line Cord & Plug S-67794) .068 Mf Capacitor - 200V. 22-2786 79.-210-8 #22 Sleeving •...
  • Page 22 PART PART DESCRIPTION 1 P RICE PRICE DESCRIPTION 39K Ohm Resistor- 1/2W. 10% 63-1852 C ASSIS 2NT21 (Confd.) 56K Ohm Resistor - 1/2W. 10% 63-1859 220K Ohm Resistor - 1/2W. 20% (2 63-1884 Insulating Strip 83-5291 required) Transistor Insulating Strip (Part Of *83-5688 1 Megohm Resistor - 1/2W.
  • Page 23 PART PART DESCRIPTION PRICE DESCRIPTION PRICE C ASSIS 4NT22 PARTS 58-214 Single Prong Plug (Part of S-71551) . 10 Z-4NL 63-1757 Battery (6 required when used) 220 Ohm Resistor- 1/2 W. 10%(2 req ’ d) 11-87 Line Cord & Plug 63-1772 470 Ohm Resistor- 1/2 W.
  • Page 24 PART PART DESCRIPTION PRICE PRICE DESCRIPTION Connector Terminal - Green Wire 8s Yellow 86-464 C ASSIS 6YT01 (Cont ’ d.) Wire (4 required) Connector Terminal - Blue Wire (2 req ’ d) *86-480 83-6208 Single Lug Terminal Strip 90-743 Spacer Sleeve (1 Used On Ea. 94-1171) Alignment Strip *83-6342 94-1171...
  • Page 25 PART PART PRICE DESCRIPTION DESCRIPTION PRICE 2.95 Transformer - Driver (2 required) 95-2340 C ASSIS 6YT24 (Cont ’ d.) 4.80 Transformer - Power 95-2353 Power Transformer oo.uu 1.90 95-2425 Zener Diode 103-96 Transformer - Driver 4.30 95-2427 8-18 x 5/16 x 1/4 Hex Hd. Self-Tap. 114-801 Transformers Driver 4.25...
  • Page 26 PART PART DESCRIPTION PRICE DESCRIPTION PRici C ASSIS 10NT01 (Cont ’ d.) *83-5975 Transistor Terminal Strip 63-1876 *83.6015 150K Ohm'Resistor • 1/2 W. 10% (2 Seventeen Lug Terminal Strip required) 86-334 Terminal (3 Used On 43-519) . 10 63-1897 470 Ohm Resistor - 1/2W. 10% ‘ (2 86-389 , Terminal - Female (6 Used On 43-574) required)
  • Page 27 PART PART DESCRIPTION PRICE DESCRIPTION PRICE 18YT20 C ASSIS PARTS 63rl764 330 Ohm Resistor - 1/2 W. 10% (3 req ’ d) 11-106 Line Cord 1.00 63-1768 390 Ohm Resistor - 1/2W. 10% (2 req ’ d) 12-4009 Tuner Bracket 63-1771 470 Ohm Resistor - 1/2W.
  • Page 28 PART PART DESCRIPTION PRICE PRICE DESCRIPTION C ASSIS 18YT20 (Cont ’ d.) 1.25 Chassis Mtg. Bracket Assembly (R.H.) S-73229 S-73230 Control Panel Assembly Three Lug Terminal Strip 83-5773 2.35 Antenna Assembly S-73253 Single Lug Terminal Strip 83-5785 S-73306 Drive Cord & Eyelet Assembly Twenty-Four Lug Terminal Strip 83-6087 Drive Cord &...
  • Page 29 PART PART DESCRIPTION PRICE DESCRIPTION PRICE C ASSIS 20YT20(Cont ’ d.) 63-6861 Dual Treble Control 2.60 43-519 Contact Housing 63-6889 Dual Bass Control 2.30 46-5155 Bandswitch Knob 1,50 *76-1734 Tuning Shaft 46-5157 Tuning Knob 1.80 78-1347 Electrolytic Wafer Socket . 10 46-5158 Loudness Control Knob 1.05...
  • Page 30 PART PART PRICE DESCRIPTION PRICE DESCRIPTION C ASSIS 20YT20 (ConVd.) Loudness Control Knob 46-5172 Balance Control Knob 46-5218 6-32 x 1/4 x 1/4 Hex Hd. Mach. Screw- 113-8 Bass Tone Control 46-5561 Internal Shakeproof Lockwasher Treble Tone Control 46-5562 (2 Mt. 85-892) Push Button, Stereo-Monaural 46-5649 6-32 x 3/16 x 1/4 Hex Hd.
  • Page 31 PART PART DESCRIPTION PRICE DESCRIPTION PRICE C ASSIS 23YT124 (Cont ’ d) 63-6442 560 Ohm Resistor - 3 W. 10% *63-7200 Dual Loudness Control 52-1215 Two Conductor Shielded Lead (Approx. *63-7201 Dual Bass Control 12 ” ) * 63-7202 Dual Treble Control 52-1516 Two Conductor Shielded Lead (Approx.
  • Page 32 PART PART DESCRIPTION PRICE DESCRIPTION PRICE Cable Retaining Clip (Used on S-69382) .10 C ASSIS 23YT124 (Cont ’ d) 19-485 20-2033 Peaking Coil 22-3 MF Disc Capacitor - 500V. 6-20 x% x% Hex Hd. Self-Tap. Screw-Stat. 114-344 .0033 MF Disc Capacitor - 500V. (2 req ’ d)25 22-13 Bronze (2 join S-76587 8s 26-1450, .001 MF Disc Capacitor - 1KV (2 req ’...
  • Page 33 PART PART DESCRIPTION PRICE DESCRIPTION PRICE C ASSIS 26YT20 (Cont ’ d) 83-6234 Rubber Channel Strip (2 Part Of 192*410) .03 *83-6235 Trim Strip - Tone Control (Part Of 63-1775 560 Ohm Resistor - 1/2 W. 10%(3 req ’ d) .17 S-76322) 2.10 63-1778...
  • Page 34 PART PART PRICE DESCRIPTION DESCRIPTION PRICE 4300 PF Mica Capacitor- 300V. 1.20 C ASSIS 26YT20 (Cont ’ d) 22-4665 Three Section Variable Capacitor *22-4776 .15 MF Capacitor-50V. (3 required) 22-5012 Rubber Grommet (4 Used On S-72985) 125-117 .47 MF Capacitor-50V. 22-5018 Heat Dissipator (2 required) 126-1106...
  • Page 35 PART PART DESCRIPTION PRICE DESCRIPTION PRICE 1st I.F. Transformer (AM) 1.80 95-2325 C ASSIS 26YT21 (Cont ’ d) 2nd I.F. Transformer (AM) 1.95 95-2326 3rdI.F. Transformer (AM) 2.65 95-2327 56 K Ohm Resistor - 1/2 W. 10% 63-1859 2nd & 4th I.F. Transformer»FM(2 rfeq ’ d) 1.90 95-2328 68 K Ohm Resistor - 1/2 W.

  • Page 36: Cabinet Parts

    PART PART DESCRIPTION PRICE DESCRIPTION PRICE C ASSIS 26YT21 (Cont ’ d) 964-19999 Case Assembly w/Hardware & Motor ­ board-Model X540L1 964-20000 Case Assembly w/Hardware & Motor ­ *S-76020 FM Tuner Assembly (See Tuner Parts board-Model X540G1 List for Components) 964-20010 *S-76044 Bumper (5 required)
  • Page 37 PART PART DESCRIPTION PRICE DESCRIPTION PRICE MODEL X547-1 (Coni ’ d) 63-1873 120K Ohm Resistor-1/2W. 10%(4Req.) 63-1876 150K Ohm Resistor-1/2W. 10%(2 Req.) 63-1897 470K Ohm Resistor-1/2W. 10%(2 Req.) ♦964-13364-A Screw-3/8 Sheet Metal-N.P. (2 Mt. 63-1911 1 Megohm Resistor- 1/2W. 10%(2 Req.) 964-18586-9 &...
  • Page 38 PART PART DESCRIPTION PRICE DESCRIPTION PRICE 149-385 Iron Core & Spring C ASSIC S-72586-F.M. TUNER COMPONENTS (Cont ’ d) Retaining Ring (4 required) 188-232 Shaft Retaining Spring 80-1467 FM Coil Winding Assembly - FM Antenna S-62887 Transformer Retaining Spring 80-1853 Coil, FM Oscillator Coil, FM-RF Input Two Lug Terminal Strip 83-3829...
  • Page 39 < ■ ” T •...
  • Page 40 < <75 V) < ’ *r ■...
  • Page 41 X540-I & X547-I C ASSIS LAYOUT X560-I C ASSIS LAYOUT...
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  • Page 48 SPEAKER HOOKUP FOR MODELS YT960.Y960, Y962, Y964, Y966.Y968, BRACKET SOCKET a CABLE ASSEMBLY.
  • Page 49 1N2! SC EMATIC IY20 SC EMATIC...
  • Page 50 2NT20 SC EMATIC 2NT20 C ASSIS LAYOUT...
  • Page 51 2NT20Z SC EMATIC 2NT20Z C ASSIS LAYOUT...
  • Page 52 i — < I —...
  • Page 53 £ (✓) in in < <N...
  • Page 54 I — >- < <...
  • Page 55 2YT23 SC EMATIC...
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  • Page 74 >- < <✓> & <...
  • Page 75 NOTES...
  • Page 76 NOTES...
  • Page 77 I8YT20& I8YT20Z SC EMATIC...
  • Page 78 ITEM PART ITEM PART DESCRIPTION DESCRIPTION 63-6854 22-3177 390 PF DISC ± 10% 500 V R12A DUAL LOUDNESS CONTROL R12B 63-6854 500 V 22-4613 .001 F.T. 63-6049 330 O MS ±10% 36 PF DISC +5% 500 V 22-5321 63-6049 330 O MS ±10% 1 W I 500 V 22-4613...
  • Page 79 20YT20 & 20YT20Z SC EMATIC...
  • Page 80 ITEM PART' ITEM PART DESCRIPTION DESCRIPTION 22-3177 390 PF DISC ±10% 500 V 63-6495 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 81 23YTI24 C ASSIS LAYOUT...
  • Page 82 ITEM PART ITEM PART DESCRIPTION DESCRIPTION 12 V 22-2884 5 MFD ELECTROLYTIC C118 22-2726 50 MFD.ELECTROLYTIC 10 V 22-3034 .05 MFD DISC 25 V 22-2720 1 PF GIMMICK 500 V 63-6376 POTENTIOMETER 22-3652 .1 MFD. DISC. 10 V 63-6442 560 O M 22-3034 .05 MFD.
  • Page 83 26YT20 SC EMATIC...
  • Page 84 ITEM PART ITEM PART DESCRIPTION DESCRIPTION 1 PF GIMMICK ±10% 500 V 22-2720 63-5652 390 O MS ±10% .1 MFD DISC 22-3652 10 y 63-6361 LOUDNESS CONTROL (REAR) .05 MFD DISC 22-3034 25 V LOUDNESS CONTROL (FRONT) 63-6363 TREBLE CONTROL (REAR) 22-2720 1 PF GIMMICK ±10% 500 V...
  • Page 85 26YT2I SC EMATIC...
  • Page 86 ITEM PART" ITEM PART DESCRIPTION DESCRIPTION 22-2884- 5 MFD ELECTROLYTIC 12 V 63-5654 470 O MS ±10% 22-2720 1 PF GIMMICK ±10% 500 V 63-530' > .51 O MS +10% 22-3652 .1 MFD DISC 10 V 63-5654 3 470 O MS ±10% 22-3034 .05 MFD DISC 25 V...
  • Page 88 ZENIT RADIO CORPORATION 1 900 N. Austin Avenue CHICAGO, ILLINOIS 60639 PRINTED IN U.S.A. F16RR66730M...

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