Continental-Radio-and-Television-Corp-8A 电路原理图.pdf

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1、MANUAL OF 1939 MOST POPULAR SERVICE DIAGRAMS / 606 TT C6 cr capacitors 1 RESISTOj .01 AOOV. RI3 5(?0| 1 CI4 .00O8S MiCA RtA soooo A C/5 01 AOOV. RiS ioo,ooo /s C/6 .01 AOOV pis 6oo.coo M c/7 005 SOOV. I Rf fO. OOO Vs CIS OOS SOOV CJ9 to . 0 AOOV t 1 CIO 10. 0 AOOV 1 C2/ OOS 1600 V i Czz 00067 J M/CA

2、 SfKn riBLD I F -tss K c. /SOO OHMS COBHECT ALIGNMENT PHOCEDOHE I.F. ALIGNMENT GENERAL DATA The alignment of this recetvor requires the use of a test os- cillator that will cover the frequencies of 456, 600, 1400, 1730, 1800, 4000, 5600, 6000, 16,000 and 18,100 KC and an output meter to be connected

3、 across the primary or secondary of the output trarisfor- mers If possible, all alignments should be made with the volume control on maximum and the test oscillator output as low as pos sible, to prevent the AVC from operating and giving false readings. COBHECT ALIGNMENT The intermediate frequency P

4、ROCEDURE (I.F.) stage should be aiignea properly as the first step. After the I.F. transformers have been properly adjusted and peaked, the Broadcast Band should always be the next procedure, after which, either or both of the Short Wave Bonds may be aligned. IF ALIGNMENT With the wave switch In the

5、 Broadcast Band and the gang condenser set at minimum, adjust the test oscillator to 456 KC and connect the output to the grid of the first detector tube (6A7) through a .05 or .1 mfd. condenser. The ground on the test oscil lator can be connected to the chassis ground if the test oscillator is not

6、grounded to one side of the power line. In case one side is connected to ground, connect a large condenser from ground on the test oscillator to ground of the chassis. Align all four I.F. trimmers to peak or maximum reading on the output meter. BBOADCAST BAND Connect the output of the sig- AUGNMENT

7、nal generator to the antenna lead (blue) through at .0002 mfd mica condenser. Set the gang condenser to minimum and the oscillator to 1730 KC and adjust the oscillator trimmer to receive this signal. Make no other adjustments at this frequency. Then set the generator to 1400 KC and tune in this sign

8、al by rotating the gang to 1400 on the dial. Adjust the preselector and antenna trimmer to maximum signal. Set the signal generator to 600 KC and tune in the signal on the receiver. Hole: approximately the same BBOADCAST BAND AUGNMENT SCHEMATIC DIAGRAM MODEL aA sensitivity should be noted at this po

9、int as w at signal strength may sometimes be improved by padding the dr- cuits This is done by slowly increasing or decreasmg padding condenser and. at the some time. back and forth across the signal with the receiver until the maxi mum reading is obtained on the output meter, seem a little complica

10、ted but is the easiest way to j Ltor to the preselector of the R.F. section. Return to 1400 KC mdi again go over the adjustments of this frequency to te certain that, they were not put slightly out of alignment when adjustment was made ai 600 KC. ncMir-P R*ND The police band Is adlst IIGOTffiNT by f

11、irst replacing the .0002 ALIGNMENT 00 hm resis- jor and setting the generator to 5600 KC. With the dan-3 f “roTn setl tiKLorT iorf roT00KcrdpdIhe“h” tp7requencyL described in the instructions for padding the broadcast circuits. oHnnT WAVE BAND The short wave band is ad- SKiimreNT insted by setting t

12、he genera- ALIGNMENT jg wlth tbe . tVi “short wave oscillator triminer to gang at mmimuni, ad) sic nnn VP lune in the sig- the. sional. Set the generator at 16,000 KC, tune in me s y 1 anH adiust the short wove antenna trimmer to give maxi- despite their rugged construction and liberal ratings. SHORT WAVE BAND ALIGNMENT Continental Radio & Television Corp., Chicago, Ill* COMPILED BY M. N. BEITMAN, SUPREME PUBLICATIONS 收音机爱 好者资料库 RadioFans.CN 收音机爱 好者资料库 RadioFans.CN 收音机爱 好者资料库 RadioFans.CN