Zenith-Radio-Corp-8H051 电路原理图.pdf

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1、MANUAL OF 1946 MOST POPULAR SERVICE DIAGRAMS mm ZZ-UttB |3-GAWG VARIABLE DN :i BROADCAST AWT. TRIM 22-629 .OS MFD._200 V. 27- 67 475MMFD, MIGA DISC. 22-1465 90MMF TRIMMER OAST DET.TRIM. RAP TRIMMER 0. SOD V. 1ST QSC.TRIM _5 DP V4 50MMFD- CER._ Zenith Radio, Chassis 8C20, Models 8H032, 8H033, 8H050,

2、8H051, 8H052. (Continued on pages 185, 186.) tyrranwi fTwrrggn -3RD. I.F TRANS. L-22, L-23 4SSKC L-20.L2I 6.3 MC -2ND-IF TRANS. L-1S, Ll 455 KC. L-I6, L-17 6 3 MC. nnrrgmu-wT EgrrgTTijF.H.jf nnrrannu.M.i.ra BElfcLBUIEEZ nnrnrrrrei MFD. MFD fcfc o e. I .1 MFD. 22-446 I 4)04 MFD. Q -1ST. J. F. TRANS.

3、L-14, L- 15 455 KC. L- 12, L-13 B.3 MC. jZ B OSC. 16D0 KC. / /C 6 OET. 1400 KC. - L7 OSC.F.M. 99MC. I j _ 40MFP.lCTRP 25V. 1392 40MFQ. 450V. 1 40 MFD. f* 450 V 62 I00MMFP, 600V. 041 .005 MFD. 400V. 2S0MMF0. 600V. _ 2DMMFD. CER._ i _J IQOMMFQ. aOOV. -1469 10MMF0.CER._ -1490 liaMMFO. CER. :29 OSC. F.

4、M. 45 MC. i/ 6SB7 iRnta rmrra rmnair E3EJ3TT roirr Harr _= re Eire JT T lir.TrIiJ L5DET.FM. DISC. I.F TRANS. 6.3 MC. rKs -C 30 OET. F M 45 MC. -4-CS ANT. F M. 45 MC. -1365 ,OI MFD. -1137 ISOMMFQ -196 AIUFD. 6S8GT- ut2 ANT. 1400 KC. -TUNING 4 BAND 1WITCH ON-OFF*SWITCH 4 VOLUME TUBE AND TRIMMER LOCATI

5、ON AM Alignment: The alignment of this chassis on the standard broadcast band Is conventional. The alignment slugs In the IF transformers are threaded and screw Into the coll forms* The slugs are slotted for a small- size fiber screw driver* Do not press hard on the aligning tool (fiber screw driver

6、) or the threads In the coll forms will strip and adjustment will be Impossible* FM RF Alignment: The same coll slug arrangement which tunes the 100 MC FM band also tunes the 45 MC band. However, on 45 MC the band switch connects trimmer con densers In parallel and padding wires In series with the 1

7、00 MC colls* The tuning slugs are attached to threaded shafts and the slugs are varl-ed In the field of the colls by turning the shafts clockwise or counter-clockwise* After adjustments the shafts must be secured with a drop of speaker cement* FM IF Alignment: The same type of tuning slugs for align

8、ing the AM IF Amplifier are used for the FM I.F*s. The second 8*3 Me IF stage Is overcoupled* When an overcoupled stage Is aligned with an unmodulated signal, the stage must be loaded* A 500 ohm carbon resistor soldered across the secondary of the second IF transformer provides a satisfactory load f

9、or this circuit. When aligning a loaded stage. It will be found that considerable signal from the generator will be required* FM Discriminator Alignment: When the secondary of the discriminator is aligned (operation 6) vise sufficient signal input to get a good positive and negative Indication befor

10、e setting the slug for zero reading* A center zero Indicating meter is recommended for this adjustment, but Is not absolutely necessary* Reversing the leads of a non-zero center meter, or observing closely when this meter starts to go to the left (negative) of zero will give the same results* See ta

11、ble on page 186. 184 COMPILED BY M. N. BEITMAN, SUPREME PUBLICATIONS 收音机爱 好者资料库 RadioFans.CN MANUAL OF 1946 MOST POPULAR SERVICE DIAGRAMS See also additional material on pages 184, and 186 COMPILED BY M. N. BEITMAN, SUPREME PUBLICATIONS 185 ALL RESISTORS! 20% TOLERANCE UNLESS OTHERWISE SPECIFIEO. 收音

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