Packard-Bell-Co-5DA 电路原理图.pdf

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1、MANUAL OF 1948 MOST-OFTEN-NEEDED RADIO DIAGRAMS (fhcfauf-tfSeH SERVICE DATA . . . MODEL 5DA All D.C. voltages measured with a vacuum tube volt meter from socket contacts to ground buss.A.C. voltages measured with a 1000 ohms per volt A.C. meter from socket contacts to ground buss.*Volume Control max

2、i mum.No signal.117 volts A.C. line voltage.All voltages shown are positive D.C. unless otherwise noted. NOTE: Filament voltages should be measured across the filament of the tube. ALIGNMENT PROCEDURE 1 * Alignment Procedure Consists of the four steps outlined -*in the Alignment Procedure Chart. For

3、 Step No. 1, I.F. Alignment, connect the leads of a test oscillator to the mixer grid and the ground buss through an .01 Mfd. capacitor (dummy load). Upon com pletion of this step “Rock” the variable condenser to assure that the I.F.s have been aligned to the correct frequency. Output should remain

4、constant at any setting of the variable condenser. ALIGNMENT CHART CONNECT STEP TEST OSC. TO TEST OSC. SETTING ADJUST POINTER FOR MAX. SETTING OUTPUT 1 Mixer Grid & Grd. .01 Mfd. Cap. 455 KC 540 KC Trimmers A, B, C, & D 2 Standard* Test Loop 1740 KC 1740 KC Trimmer E to 1740 KC 3 Standard* Test Loop

5、 1500 KC 1500 KC Trimmer F 4 Standard* Test Loop 600 KC 600 KC Loop NOTE: Hazeltine Standard Test Loop No. reasonable substitute. 1- 1150 or a ! TRIMMER 6 VOLUME CONTROL ft SWITCH *R1-1, 220,000 ohm resistor, is used only in sets utiliz ing metal, octal base tubes. : 180 ohm watt resistor used for sets employing miniature glass tubes. lag SOBS 12 BAS 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