Philco-Radio-and-Television-Corp-M-709 电路原理图.pdf

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1、 VOLUME R-24. MOST-OFTEN-NEEDED 1964 RADIO SERVICING INFORMATION PHILCO TABLE/CLOCK AM RADIO MODELS M-709 - V2 I2BA6 IF AMP V4 50C5 OUTPUT ,6 tstmul A R6 / i ,j.j. .i.j. 5V rt Hi.4190V i fill :9 .trr-v ist audio _ _R3_ 2ND PET Component Location, Foil Side of Perma-Circuit Panel ALIGNMENT - To elimi

2、nate shock hazard, use an isolation transformer between radio chassis and a-c power outlet. Allow radio and test equipment about 15 minutes to warm up before starting alignment. Connect an a-c VTVM across the speaker voice coil. Use an AM R-F signal generator connected as indicated in chart. Set vol

3、ume control to maximum no signal output. Keep generator output as low as possible. ALIGNMENT CHART RADIO DIAL SETTING SPECIAL INSTRUCTIONS ADJUST Gang fully open Adjust for max. output in order given. Tl-bot. rock tuning gang while making adjustment. Ll-osc. Gang fully open Adjust for max. output. C

4、5-osc. trim. 1500KC Adjust for max. output. C3-ant. trim. SIGNAL GENERATOR CONNECTION TO RADIO R-F section of gang through a lmf cap. Use radiated signal (See note) Use radiated signal 4 Use radiated signal_ 1500KC 1500KC Adjust for max. output. C3-ant. trim. 5 Repeat steps 2, 3 and 4 until no further improvement is obtained. NOTE: Use a 6 to 8 turn, 6-inch diameter loop made up of insulated wire. Connect to generator terminals; and place about one foot from radio loop. 112 收音机爱 好者资料库 RadioFans.CN