Noblitt-Sparks-Industries-Inc-169701 电路原理图.pdf

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1、VOLUME R-23, MOST-OFTEN-NEEDED 1963 RADIO SERVICING INFORMATION A MODEL 72P25 CODE 1.69701 I8FW6 t2 JrajrML lFAMPLIF0E NOTES- 1. 8- -CHASSIS. VOLTAGES MEASURED WITH V.T.V.M. 2. *6-EXTERNAL CONNECTIONS TO PRINTED BOARO. 3. RESISTANCE MEAOURED IN OHMS; K-1,000 M-I,000,00a 4. RESISTORS ARE A WATT WITH

2、A + 20% TOLERANCE UNLESS OTHERWISE INDICATED. 5. CAPACITANCE VALUES LESS THAN ONE (11 ARE IN MICROFARADS (/), AND VALUES OF ONE (I) OR GREATER ARE IN MICRO-MICROFARADS (*) UNLESS OTHERWISE INDICATED. & COMPONENTS IN THIS AMPLIFIER ARE INTERCONNECTED TO RESULT IN A CONSISTENT PHASE RELATION OETWEEN C

3、HANNELS DO NOT DESTURB THIS RELATIONSHIP DURING SERVICING. ? PHASING DOT. T3,T4(IN PHASE TERMINALS) SPEAKER (POSITIVE VOLTAGE MOVES VOICE COIL OUTWARD ). *6. SELECTOR SWITCH VIEWED FROM FRONT IN FULL COUNTER CLOCKWISE, RADIO POSITION- 60* DETENT. non SW-3 ON CHANGER i. 51 VS V5 V4 VI V2 20EZ7 32ET5

4、32ET5 FX6 I8FW6 L-P_ -1 4 7f/ IOOMA J _ .01 RECT | !*! J3-T C6A L-i-CT O-f| 100 7 ON VOL.SW-2 T -z MFD “M ALIGNMENT PROCEDURE PRELIMINARY: 04 Output meter connection .Across speaker voice coil Output meter reading to indicate 500 milliwatts . . 1.26 volts Connection of generator ground lead,.Floatin

5、g ground Generator modulation.30% 400 cycles Position of Volume Control.Fully clockwise Position of Variable Frequency of Generator Dummy Antenna Generator Output Connection Trimmers Adjusted in Order Shown for Maximum Output Function of Trimmer Open Open 1400 1000 600 455 Kc 1670 Kc 1400 Kc 1000 Kc

6、 600 Kc .05 p fd Pin 7 18FX6 * Test Loop * Test Loop * Test Loop * Test Loop Al, A2, A3, A4 A5 A6 Fan CIA Plates Fan CIA Plates I.F. Oscillator Antenna -Standard Hazeltine Test Loop Model 1150 or a 6 diameter loop, composed of 3 turns of wire, placed about one foot from the set loop. The alignment procedure should be repeated in the original order for greatest accuracy. Always keep the output from the signal generator at its lowest possible value to make the AVC action of the receiver ineffective. 18 收音机爱 好者资料库 RadioFans.CN