Crosley-Corp-Chassis-28 电路原理图.pdf

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1、收音机爱 好者资料库 RadioFans.CN MANUAL OF 1941 MOST POPULAR SERVICE DIAGRAMS chassis model 28 INSTRUCTIONS FOR MODEL CB82-R RADIO RECEIVER ALIGNMENT PROCEDURE PRELIMINARY Output Meter Connections.Plate to Plate of 6K6G s Generator Ground Connection. To chassis or Ground Lead Dummy Antenna to be in series wi

2、th generator output.See Chart Below Position of Volume Control. , .Fully On Position of Tone Control.Treble or Speech Position of Mike Level Control.A11 the Way to Left (Off) Sequence 1. Dummy Antenna Frequency Setting Input Connection to Receiv er Band Switch Tuning Cond. Setting Trimmer Adjusted R

3、emarks .02 MF. 45d Kc. Grid of 6A8GT B. C. Fully open 2nd T-F (2) 1st I-F (2) Adjust for Maximum. Adjust for Maximum. ,0002 MF. 1650 Kc. Ant, Lead (Blue) B. C. Fully open B. C. OSC Trimmer Adjust for peak: gang does not have to tune thru signal. .0002 MF. 600 Kc. Ant. Lead (Blue) B. C. Approx. 60 on

4、 dial B. C, OSC Series Trimmer Adjust for maximum output while rocking gang thru signal. Repeat Step No. 2 to check possible shift due to s eries adjustment .0002 MF. 1400 Kc- Ant, Lead (Blue) B. C, Approx. 140 on dial B. C. “ANT Trimmer B. C. “PRE Trimmer Adjust for maximum output to not touch B. C

5、. Osc. Trimmer. Adjust for maximum output. 400 ohm (carbon) 5.3 Me. Ant. Lead (Blue) Police Fully open Pol OSC Adjust for peak gang; does not have to tune thru signal. 400 ohm (carbon) 5.0 Me. Ant. Lead (Blue) Police Approx. 5.0 Pol ANT Adjust for maximum output while rocking gang thru signal. 400 o

6、hm (carbon) 18.3 Me. Ant. Lead (Blue) s. w. Fully open S. W. OSC Adjust for peak. Gang does not have to tune thru signal. 400 ohm (carbon) 18.0 Me. Ant. Lead (Blue) s. w. Approx. 18 S. W. ANT Adjust for maximum output while rocking gang thru signal. When aligning the shortwave bands “OSC” trimmers c

7、are must be exercised to that the c are aligned on the correct frequency and not on the image which is approximately 910 kilocycle less as indicated on the dial. To check, increase generator output, tune-in the generator frequency and then tune-in the image frequency which should be weaker than the

8、fundamental an come approximately 910 kilocycles lower on the dial than the fundamental. If ge cannot be tuned- the “OSC” trimmer is adjusted to the wrong peak. (Correct peak is the second peak on trimmer from the closed position). Repeat the original alignment procedure for more accurate adjustment

9、s. Always keep signal gen erator output as low as possible to prevent action of the A.V.C. circuit. _ SOCKET VOLTAGES MEASURED 117.5 VOLTS LINE (BETWEEN SOCKET PIN AND CHASSIS) WITH 1000 OHM PER VOLT, 500 VOLT RANGE VOLTMETER (D. C.) PIN NUMBER TUBE FUNCTION 1 2 3 4 _5_6_7_ 6SK7Pre-Amp. 6A8GTOsc.-Mo

10、d. 6SK7I. F. Amp. 6SQ7Det. A. V.C.-A. F. 6J5GTPhase Invert. 6K6GOutput . 5K6G Output . 5Y3GRectifier . Measure with A. C. Voltmeter. MAX, POWER OUTPUT fj 117.5 V. LINE,. 5.0 Watts 34 POWER CONSUMPTION 4/ 117.5 V. LINE. 66 Watts (Radio Only) TOTAL POWER CONSUMPTION ra 117.5 V. LINE.110 Watts (Including Phono Motor) DROP ACROSS SPEAKER FIELD. 74 Volts Voltages may vary lCK/ of values given. t n TTrwr-TTnN Rl.OCK N. C.NO CONNECTION J. B.JUNCTION BLOCK w. c.inu COMPILED BY M. N. BEITMAN, SUPREME PUBLICATIONS 收音机爱 好者资料库 RadioFans.CN