Zenith D952X Service Manual

High fidelity and stereo fm models

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ERVICE MANUAL

FIDELITY

AND STEREO FM MODELS

ZENIT RADIO CORPORATION

1900 N. AUSTIN AVENUE

C ICAGO. ILLINOIS 60639

$1.50

PRINTED IN U.S.A. RR127227M

923-718

F28

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Summary of Contents for Zenith D952X

Page 1 ERVICE MANUAL FIDELITY AND STEREO FM MODELS ZENIT RADIO CORPORATION 1900 N. AUSTIN AVENUE C ICAGO. ILLINOIS 60639 $1.50 PRINTED IN U.S.A. RR127227M 923-718...
Page 3 INDEX C ASSIS LAYOUT ‘ ARTS LIST C ASSIS SC EMATIC PAGE PAGE PAGE OR MODEL Refer to HF26 WDA 0 42,43 WDA 0Z 2AT30 Refer to HF 8, HF 9 Refer to HF 8- , HF 8-2, HF 9, HF 2 , HF 26 3AT20 3AT20Z 44,45...
Page 4 FEATURES OF IG FIDELITY & STEREO FM MODELS CABINET C ASSIS SPEAKERS VOICE COIL MODEL STYLE COLOR MODEL TYPE OUTPUT PART IMPED. SIZE NOTE II NUMBER (In Ohms) (In Inches) B505B Portable Blue &* Phono Only 849-48B Note 2 (Removable White (RA7) Lid)
Page 5 FEATURES OF IG FIDELITY & STEREO FM MODELS OT ER FEATURES RECORD C ANGER REMOTE POWER RECORD SPEAKER TAPE INDICATOR 45 RPM CARTRIDGE STYLUS NOTE 1 PART MOUNTING PROVISION PROVISION STORAGE LIG T ADAPTER NUMBER 827- SB 942-8B Manual Integral 856- 5B Player 827- 8B...
Page 6 FEATURES OF IG FIDELITY & STEREO FM MODELS CABINET C ASSIS SPEAKERS VOICE COIL MODEL STYLE COLOR MODEL TYPE OUTPUT PART IMPED, SIZE NOTE II NUMBER (In Ohms) (In Inches) D583W Modular Walnut FM/AM/Phono 2x4W 849-78B 2-6% Note 2 Table (HF26) (Lift Lid) D587W...
Page 7 FEATURES OF IG FIDELITY & STEREO FM MODELS RECORD C ANGER OT ER FEATURES POWER REMOTE PART MOUNTING CARTRIDGE STYLUS NOTE 1 45 RPM INDICATOR TAPE RECORD SPEAKER NUMBER ADAPTER LIG T PROVISION STORAGE PROVISION 69-4 8 Shelf 42- 76 S-78980 Note 7 Note 6...
Page 8 FEATURES OF IG FIDELITY & STEREO FM MODELS SPEAKERS CABINET C ASSIS VOICE COIL TYPE OUTPUT PART IMPED. SIZE MODEL STYLE COLOR MODEL NOTE II NUMBER (In Ohms) (In Inches) 2x4W 49- 094 4-3 / 2 D904DE Console Dark Oak 4WDR50X FM/AM/Phono 2-6x9 49- 224-0...
Page 9 FEATURES OF IG FIDELITY & STEREO FM MODELS OT ER FEATURES RECORD C ANGER REMOTE POWER SPEAKER RECORD TAPE NDICATOR 45 RPM STYLUS NOTE 1 CARTRIDGE MOUNTING PART PROVISION STORAGE PROVISION LIG T ADAPTER NUMBER Note 5 Note 8 S-82964 42- 77 Shelf 69-4 5...
Page 10 SPEAKERS MODEL VOICE COII STYLE COLOR MODEL TYPE OUTPUT PART IMPED. SIZE NOTE II NUMBER (In Ohms) D952X Console White 35WDR50 FM/AM/Phono 2x35W 49- 68 2-3% (Lift Lid) 49- 24 2- 0 DT953DE Console Dark Oak 35WDR50 FM/AM/Phono? ' 2x35W...
Page 11 FEATURES OF IG FIDELITY & STEREO FM MODELS RECORD C ANGER OT ER FEATURES POWER REMOTE PART MOUNTING CARTRIDGE STYLUS NOTE 1 45 RPM INDICATOR TAPE RECORD SPEAKER NUMBER ADAPTER LIG T PROVISION STORAGE PROVISION 69-420 Shelf 42- 67 S-82964 Note 7 Note 4 S-8262...
Page 12 (not exceeding 25 watts, MPO, per channel) which have external speaker terminals (see notes 4 and 5 above). 0. One pair of Models S90 7W, S90 7W , or S90 7W2 Extension Speakers may be used with any Zenith stereo model which has external speaker terminals (see notes 4 and 5 above).
Page 13 FFATIIRFS OF IG FIDELITY & STEREO FM MODELS OTHER FEATURES RECORD CHANGER REMOTE POWER SPEAKER RECORD TAPE INDICATOR 45 RPM STYLUS NOTE 1 CARTRIDGE MOUNTING PROVISION PART STORAGE PROVISION LIG T ADAPTER Ml ll\/IRFR S-78980 42- 72 69-446 Shelf 56-597 S-82965 —...
Page 14 FM/MX/AM ALIGNMENT AND GENERAL INFORMATION T EORY FM CABINET ANTENNA From time to time Zenith includes the use of new components Certain models contain an FM antenna built into the cabinet. and circuit applications in product design. Theory and This antenna is a folded dipole cut to the desired frequency, explanation of such components and circuits is included in and is attached to the internal periphery of the cabinet.
Page 15 Audio Signal Sources should be used. CIRCUIT BOARD COMPONENT IDENTIFICATION RESISTANCE MEASUREMENTS As a special feature to aid the Service Technician, Zenith has It is recommended that you use an ohmmeter having a very identified the location of components which are mounted on low voltage in the meter circuit.
Page 16 3. Small stiff glue brush (for solder removal). , . FM ALIGNMENT 4. Metal pick (soldering aid). Alignment of these chassis will, in most cases, not be necessary 5. Pencil type soldering iron with a small tip (25 watts or unless an RF or IF transformer is replaced or if someone has less).
Page 17 2 ° S '2i _J o I— □ — _ — < O> < < £ Ol ’ S ‘ ___ _ _____ . ________ - o --------- < * = - £ ’ st +-• < •o ® £ °...
Page 18 NOTES...
Page 19 SECTION T REE MULTIPLEX ALIGNMENT PROCEDURE markers are desirable to achieve S curve symmetry. The Before any attempt is made to align, or service, FM Multiplex pattern illustrating marker use to obtain S curve symmetry circuitry, the technician must be certain that the RF, IF, and indicates it is most necessary to adjust for maximum gain and Ratio Detector alignment is correct, and that the receiver at the same time maintain linearity and symmetry.
Page 20 ^ 1IA _ „ FM-MULTIPLEX ALIGNMENT PROCEDURE C ASSIS - 10ZT30, 11AT30, 15WDR50Z1, 20AT21, 20AT21Z, 20AT30, 20AT30Z, 20AT31Z, 21BT30, 21BT34, (Z1 ), 25AT20 25BT22 25WDR50, (Z 1), 27BT30, 29CT20, 29CT21 , (Z 1), (Z2), 29AT24, (Z1 ), (Z2), 29CT30, 35WDR50. Before aligning or servicing Multiplex Circuits be certain that RF, IF, and Ratio Detector are correctly aligned and that operation is normal on monaural FM signals.
Page 21 FM - MULTIPLEX ALIGNMENT PROCEDURE - C ASSIS 5WDR50X, (XI ) CONNECT CONNECT DUMMY INPUT STEP SCOPE AND/ GENERATOR ANTENNA SIGNAL BAND SET DIAL TO ADJUST PURPOSE OR VTVM FREQUEN CY NOTE - ’ PLACE BAND SWITC IN FM-STEREI 3 AND AFC TN OFF. FOR FOLLOW ING ADJUSTMENTS U SE 98M z OR OT ER CLEAR RF FREQUENCY NEAR CENTER SC/J iLE.
Page 22 SECTION FOUR T EORY AND APPLICATION Sound level of signals radiated thru the port (in the 40-70 Hz ALLEGRO SPEAKER SYSTEM - MODEL D9013W range) is comparable to the sound level radiated by the woofer (in the range of 70 Hz to kHz).
Page 23 When servicing these units (or for that matter most speaker enclosures) Several precautions must be taken: A. When removing the back, be careful when handling the acoustical pads (they may tear easily). B. All speakers must be securely fastened to prevent leaks and rattles.
Page 24 Note. Certain mechanical components in the following parts lists are manufactured to metric standards. Caution should be used in selection of replacement hardware. PART PART DESCRIPTION DESCRIPTION C ASSIS 1WDA10Z1 63- 83 2K Ohm Resistor - /2W. 0% (3 Req.) 63- 868 00K Ohm Resistor - /2W.
Page 25 PART PART DESCRIPTION DESCRIPTION C ASSIS 35WDR50 (CONT'D.) *83-7552 Transistor Insulating Washer (2 Part Of Ea. 2 -85 3X) 83-7803 3 Lug Terminal Strip 22-597 .0033 MF Mylar Capacitor (2 Req.) 83-8 63 Antenna Mtg. Terminal Strip (2 Part Of S-88463) 22-5972 390 PF Polystyrene Capacitor - 25 V.
Page 26 20K Ohm Resistor - /2W. 0% *964- 2879 964-23 4 -3 Catch *964- 6587 330K Ohm Resistor - /2W. 0% Emblem, Zenith (Used on Record 964-23279 964- 80 4 4.7 Ohm Resistor - /2W. 0% Changer Cabinet Drawer) 964- 9582 .8 Megohm Resistor - /2W.
Page 27 PART PART DESCRIPTION DESCRIPTION 5 MF Electrolytic - 35V. *822- 075B MODEL D554W, W1 822- 05B 33 PF Capacitor (2 Req.) C ASSIS COMPONENTS (CONT'D) 2.2 Ohm Resistor - /2W. 0% (2 Req.) 863- 56B *863-750B Control, Bass - Treble (2 Req.) 863- 97B 220K Ohm Resistor - /2W.
Page 28 *964-23 4009 Strike - Plastic (2 Req.) MODEL D742W, W1 *964-23 4 -09 Catch - Plastic Block (2 Req.) C ASSIS COMPONENTS 964-23279 Emblem, Zenith (Used on 964-29094) 964- 9638 .05 MF Capacitor - 00V. 964-23362 Terminal (Part of 964-29 25) 964- 9755 00 PF Capacitor - 500V.
Page 29 SPEAKER WIRING - SC EMATIC...
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Page 49 TRAN I TOR PART NO. DE CRIPTION Q402 I2I-430 AUDIO AMPLIFIER Q452 Q403 I2I-768 PRE-DRIVER Q453 Q404 CONTROL I2I-767 Q454 Q405 I2I-773 Q455 DRIVER Q406 I2I-774 Q456 Q407 Q457 I2I-880 OUTPUT Q408 Q458 C ASSIS 25WDA10 - C ASSIS LAYOUT...
Page 50 NOTE - A TEMPORARY GROUND WIRE MUST BE CON NECTED BETWEEN THE INPUT SHIELD AND THE NEGATIVE TERMINAL OF C505 WHEN SERVICING CHASSIS 25WDA 0 (IF DISCONNECTED FROM CHASSIS 5WDR50X AND SWITCHING NETWORK). NOTES ALL RESISTORS IN OHMS, ±IO%, I/2 WATT CARBON UNLESS OTHERWISE SPECIFIED.
Page 51 C ASSIS 25WDA10 ITEM PART DESCRIPTION C414 22-3687 1 MFD ELECTROLYTIC - 50V. C416 22-2884 5 MFD ELECTROLYTIC - 12V. C417 22-5482 680 PF DISC. - 500V. C418 22-3362 560 PF-500V. C419 22-5986 50 MFD ELECTROLYTIC - 25V. C420 22-5866 .047 MFD - 100V.
Page 52 C ASSIS 35WDR50 - SC EMATIC...
Page 53 LEGEND C ASSIS 35WDR50 ITEM PART ITEM PART DESCRIPTION DESCRIPTION NUMBER NUMBER FM ANT TRIMMER R223 63-1904 680K O M FM ANT TUNING R224 63-1898 470K O M 20% FM DETECTOR TRIMMER R225 63-1799 2.2K O M FM DETECTOR TUNING R226 63-1852 39K O M...
Page 54 TRAI\ I TOR TE T POINT No. PART No. DE CRIPTION A FM ANTENNA INPUT 121-826 F.M.-R.F D 1 T FM IF INPUT E 2ND FM 1 F lh PUT 121-613 F.M. CONVERTER 121-850 F 3RD FM 1 F IF, PUT QIOI A.M.-R.F.

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