Zenith A507F 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

F 18 SUPPLEMENT

PART NO. 923-576

PRICE $1.50

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Summary of Contents for Zenith A507F

Page 1 ERVICE MANUAL FIDELITY AND STEREO FM MODELS ZENIT RADIO CORPORATION 1900 N. AUSTIN AVENUE C ICAGO, ILLINOIS 60639 F 18 SUPPLEMENT PART NO. 923-576 PRICE $1.50...
Page 3 INDEX ALL CHASSIS COVERED IN SERVICE MANUAL HF 18 (923-558) EXCEPT ’ CHASSIS COVERED IN THIS SERVICE MANUAL HF-18S (923-576) C ASSIS SC EMATIC LAYOUT PARTS LIST PAGE PAGE PAGE C ASSIS — 1Y20Z 2ZT21 100, 101 2ZT22 100, 101 2YT23 58, 59 2ZT24...
Page 4 SIZE PART COIL MODEL COLOR MODEL STYLE TYPE POWER IMPED. INC ES NUMBER OUTPUT (IN O MS) G een A507F Table 3AT20 1-2x6 3 T ansisto 49-1184 (w/handle) Phono Only (lift lid) A507L Table Beige 3AT20 1-2x6 3 T ansisto —...
Page 5 FEATURES OF IG FIDELITY & STEREO FM MODELS RECORD C ANGER OT ER FEATURES REMOTE RECORD INDICATOR STYLUS NOTE 1 NUMBER MOUNTING CARTRIDGE TAPE SPEAKER LIG T ST ORAGE PROVISION 169-374 Shelf — — — — 142-170 56-567 169-373 Shelf 142-170 56-567 169-375...
Page 6 Fo theo y andL ope ation, of ci cuits cove ed in this manual, The e a e ce tain minimum voltages necessa y fo p ope efe to Se vice Manual HF 18 (Zenith Pa t No. 923-558). ste eo FM eception. To help dete mine if the e is sufficient signal available, the following developed AGC voltage ve sus mic ovolt input voltage cha ts have been compiled.
Page 7 A hissing sound may be noted when tuning between F equency Modulation As a special featu e to aid the Se vice Technician, Zenith has stations. This is no mal, and will disappea as the station is identified the location of components which a e mounted on tuned in.
Page 8 SIGNAL TRACING A technique used in adio commonly known as “ Sc ew d ive testing ” in which the B plus at the plate of the tube o collecto of a t ansisto is sho ted to g ound to check fo “...
Page 9 E +- (/> “ U < «-»- o *- a> *♦- < <2 <✓> ►J < < < co** < <...
Page 10 . Preliminary Procedures Befo e using the Zenith FM multiplex signal gene ato , it is ecommended that it be connected to the powe sou ce and tu ned on giving it a 10 to 20 minute wa mup pe iod. This will allow ample time fo the RF, audio, and 19KHz oscillato s to stabilize.
Page 11 in this manne the multiplex alignment would then be the best po tion, the multiplex gene ato can be used as an excellent that could possibily be obtained and sepa ation would be the signal t acing device to dete mine if the multiplex section of maximum fo this eceive .
Page 12 PARTS LIST NOTE: Certain circuit boards included in this parts list have component locations identified by item number on the circuit board. These item numbers are also shown on the schematic and in the following parts list - See F 18 for more information. ITEM PART ITEM...
Page 13 ITEM PART ITEM PART DESCRIPTION DESCRIPTION R31 ’ 7 C504 22-5362 1000 MFD Elect olytic 50V 63-1789 1.2K Ohm Resisto 210% YaW C505 22-5316 500 MFD Electo lytic 50V R318 63-1771 470 Ohm Resisto 1C% YaW 22-5474 2000 MFD Elect olytic 30V C506 R401 63-1852...
Page 14 PART item ITEM PART DESCRIPTION DESCRIPTION Rea Chassis Suppo t B acket *12-5214 L202 20-142 2 Peaking Coil *12-5216 Light Shield St ip L203 In T20=l 2nd IF T ansfo me (FM) P ima y Dial Scale *26-1811 L204 In T20H 2nd IF T ansfo me (FM) Seconda y Function Plate Housing *43-1103...
Page 15 ITEM PART ITEM PART DESCRIPTION DESCRIPTION 69-217 440 x 3/16 Rd. Hd. Machine Sc ew-N.P. (2 86-390 Connecto Te minal (2 equi ed) used on ea. 85-1071 & 85-1072) (4 equi ed) Connecto Te minal (3 equi ed) 86484 *78-1891 Socket &...
Page 16 ITEM PART ITEM PART DESCRIPTION DESCRIPTION 63-4241 22K Ohm Resisto - 1/4 W. 10% 94-613 I on Co e Bushing (4 equi ed) 63-4269 100K Ohm Resisto - 1/4W. 10% 94-1472 Tuning Shaft Bushing (Used on S-83179 only) 63-4283 220K Ohm Resisto - 1/4W. 10% 94-1534 Tuning Shaft Bushing (Used on S-82931 only) 63-4297...
Page 17 NOTES...
Page 18 < § <...
Page 19 < § > < □...
Page 20 > < § < <...
Page 21 < <...
Page 22 > < I < <...
Page 23 § > < < § < <...
Page 24 25AT20 - RF-C ASSIS WIRING AND COMPONENTS AS VIEWED FROM FOIL SIDE...
Page 25 25AT20 SC EMATIC...
Page 26 25AT20 - C ASSIS LAYOUT...
Page 28 ZENIT RADIO CORPORATION 1900 N. AUSTIN AVENUE C ICAGO, ILLINOIS 60639 SPECIFICATIONS SUBJECT TO C ANGE WIT OUT NOTICE 923-576 F18S RR 8/69 30M PRINTED IN U.S.A.

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