Crosley-Corp-72CA 电路原理图.pdf

MANUAL OF 1942 MOST POPULAR SERVICE DIAGRAMS INSTALLATION, operating and service instructions for Crosley Model 72CA Chassis Model No. 80 Model 72CA is a seven tube, two band, superhetrodyne receiver. It is designed to operate on Alternating Current (A.C.) electric circuits as specified on the Model and License label. _ /FREQUENCY RANGE d d x * do xx do XX dd XX do XX OO XX n oo (MO oo 5m 2s 1160 650 950 540 OO m 0m ANTENNA ADJ. SCREWS SETTING THE PUSH BUTTONS OSCILLATOR-ADJUSTING SCREWS 1 1 1 t _ * 3 4 ! / / PUSH BUTTONS Note: When placing call tabs in the window be sure to arrange them according to their fre quency (kilocycles) that is: the station whose frequency is well within the range covered by the No. 1 button, should be placed above that I 2 3 4 56 button and so on with the rest of the buttons / / to be set. F,g- 1 PUSH BUTTONS Remove station selector push button escutcheon. Turn the receiver on and let it operate for a sufficient length of time to permit the tubes to reach their normal operating conditions. It is essential that the frequency (kilocycles) of the station selected be within the range of the push button to be set for that station. See Fig. 1. 1. Turn the band change switch to the “American” position. Using the station selector knob, care fully tune in the station to which the No. 1 push button is to be set. Note program. 2. Turn the band change switch to the “Automatic” position and using a small screw driver, care fully turn in a clockwise direction the Oscillator adjusting screw until the station previously tuned in manually is heard again. Adjust for maximum output in the speaker. 3. Adjust the Antenna adjusting screw for maximum volume in the speaker. 4. Turn band change switch from “Automatic” to “American” and back again to check if adjust ment has been correctly made. There should be no change in tone quality when switched from one to the other. 5. Repeat above procedure for the remaining push buttons. To tune the receiver with the push buttons, set the band change switch on “Automatic” and depress completely the button corresponding to the station you wish to hear. TUBE VOLTAGE CHART SOCKET VOLTAGES MEASURED AT 117.5 V. LINE (BETWEEN SOCKET PIN AND CHASSIS) WITH 1000 OHM PER VOLT, 500 V. RANGE VOLTMETER (D. C.) FUNCTION 6SK7R. F. Amplifier . 6SA7OSC. Mod. 6SK7I. F. Amplifier . 6SQ7Det. A. S. C. lat A. F. 6AD7Phase Inverter. 6F6Output. 5Y3GRectifier. l 2 PIN NUMBER 3 4 5 6 7 8 0 0 0 0 0 80 6.3 A. C. 235 0 0 260 80 0 0 6.3 A. C. 0 0 0 0 0 0 80 6.3 A. C. 260 0 0 0 0 0 85 6.3 A. C. 0 0 0 255 260 0 180 6.3 A. C. 23 0 0 255 260 0 235 6.3 A. C. 23 N. C. 330 J. B. 300A.C. J. B. 300 A. C. J B. 330 MAX. POWER OUTPUT.6.5 WATTS POWER CONSUMPTION. 85 WATTS DROP ACROSS SPEAKER FIELD. 70 VOLTS J. B.Junction Block. N. C.No Connection COMPILED BY M. N. BETTMAN. SUPREME PUBLICATIONS 收音机爱 好者资料库 RadioFans.CN MANUAL OF 1942 MOST POPULAR SERVICE DIAGRAMS Crosley Model 72CA Chassis Model Ho. 80 ALIGNMENT PROCEDURE Output Meter Connections.ple ,6AD7 t plate of 6F<j Dummy Antenna to be in series with generator output.see f w Position of Volume Control. Ti.F y Position Align ment Sequence of Tone con Dummy Antenna uroi. Frequency Setting Input Connection to Receiver Band Switch Tuning Cond. Setting Trimmer Adjusted Remarks 1. .02 MF. 455 Kc. Stator lug Rear sec tion of Gang Cond. B. C. Fully open 2nd I-F (2) 1st I-F (2) Adjust for Maximum. Adjust for Maximum. 2. .02 MF. 455 Kc. Stator lug Rear sec tion of Gang Cond. B. C. Fully Open Adj. Wave Trap Trimmer. Adjust for Minimum. 3. .0002 MF. 1650 Kc. Ant. Terminal B. C. Fully open B. C. OSC Trimmer Adjust for peak; gang does not have to tune thru signal. Loop must be connected. 4. ,0002 MF. 600 Kc. Ant. Terminal B. C. Approx. 60 on dial B. C. OSC” Series Trimmer Adjust for maximum output while rock ing gang thru signal. 5. Repeat Step No. 3 to check possible shift due to series adjustment. 6. .0002 MF. 1400 Kc. Ant. Terminal B. C. Approx. 140 on dial B.C. LOOP ANT Trimmer Adjust for maximum output do not touch B. C. Osc. Trimmer. 7. 400 ohm (carbon) 18.3 Me. Ant. Terminal S. W. Fully open S. W. “OSC Adjust for peak. Gang does not have to tune thru signal. 8. 400 ohm (carbon) 18,0 Me. Ant. Terminai s. w. Approx. 18 S. W. ANT Trimmer Adjust for maximum output while rocking gang thru signal, do not touch B. C. Osc. Trimmer. 9. Repeat the above alignment procedure for more accurate adjustments. Always keep signal generator output as low a8 possible to prevent action of the A. S. C. circuit. IMPORTANT ALIGNMENT NOTESWhen aligning the shortwave band OSC trimmer care must be exercised to see that the circuit is aligned on the correct frequency and not on the image which is approximately 910 kilocycles less as indicated on the Receiver dial. To check, increase generator output tune-in the generator frequency and then tune-in the image frequency which should be weaker than the fundamental and come in approximately 910 kilo cycles lower on the Receiver dial than the fundamental. If image cannot be tuned-in, the OSC” trimmer is adjusted to the wrong peak* (Correct peak is the second peak on trimmer from the closed position.) 收音机爱 好者资料库 RadioFans.CN 收音机爱 好者资料库 RadioFans.CN