General-Electric-Co-C417 电路原理图.pdf

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1、VOLUME R-18, MOST-OFTEN-NEEDED 1958 RADIO SERVICING INFORMATION GENERAL ELECTRIC Models C415.-A,-B, C416,-A,-B, and C417 TO REMOVE CHASSIS FROM CABINET 1. Remove tuning, volume and timer knobs. 2. Remove time set knob from shaft at back of cabinet.Hold shaft and turn knob counter clock wise. 3. Remo

2、ve five hex-head screws on cabinet back. 4. Remove four hex-head screws on bottom of cabinet. 5. Remove Snooz-Alarm.knob. 6. Remove timer by unscrewing four Phillips head screws. 7. Unsolder speaker leads from speaker. 8. Pull chassis out slowly. Leads from chassis to timer remain attached for A. C.

3、 while testing. CAUTION The chassis uses the dip solder copper-plated printed circuit to eliminate most of the inter connecting wiring. When soldering, keep the heat to a minimum to prevent the printed wiring from be coming unbonded. A 35 to 50 watt soldering iron is recommended. Always use an isola

4、tion transformer when servicing this receiver. To protect the test e- quipment being used when aligning, connect the out put lead of the signal generator to the grid of an I. F. tube through a .05 capacitor. This will prevent the output impedance of the generator from having a loading effect on the

5、circuit. STEP CONNECT TEST OSCILLATOR TO TEST OSCILLATOR SETTING TUNING GANG SETTING ADJUST FOR MAXIMUM OUTPUT I. F. ALIGNMENT i V2, 12BA6 grid (pin 1) in series with .05 mfd. Cores of 2nd I.F. Transformer T2 2 VI, 12AU6 grid (pin 1) in series with .05 mfd. Cores of 1st I. F. Transformer T1 3 Recheck adjustment of T1 and T2 R. F. ALIGNMENT I 4 5 Inductively coupled to radio loop 1620 kc 1500 kc Tuning gang Open For Maximum Output C1D C1B* * Rock Tuning for maximum while adjusting C1B. 68 收音机爱 好者资料库 RadioFans.CN