Philco-Radio-and-Television-Corp-M-1664 电路原理图.pdf

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1、收音机爱 好者资料库 RadioFans.CN VOLUME R-25, MOST- PHILCO STEP 3 ON) GANG FULLY OPEN AOJ. TO NAX.OUT 1620KC -NEEDED 1965 RADIO SERVICING INFORMATION MODELS M-1001, M-1620, M-1662, M-1663, M-1664, 00IC34 IN60C 02 36 V2 19KC DOUBLER 6BH6 NEON INDICATOR ifit nnT-Six LOOSE COUPLER M I VFk *.jIEUL f- - 1500 XC 1

2、 STEP I ONLY) (FM) catEBeBBsa TO PIN I OF VT $TEP4(FM) SEE PRELIMINARY 4E ADJ TOP-D VOLTS DC, X STEP 2 (FM) SEE PRELIMINARY4D ADJ. DOT. MAX IO.TNC _15 R6 I “ 220K? I 38KC 4 transf. V3 P22 INVERTER IOOK /2 12AX7A V8 AUDIO PWR. AMR 7 135V 6 125V RH EXT SPKR JJ C20 ; 50U.F ISO IW R26A V5 AUDIO 9.9V PWR

3、.AMP 25F5A -rz-.JS-J r- yi25v ALL VOLTAGES TAKEN WITH PRECISION” VTVM MODEL *88 ALL CONTROLS SET AT MINIMUM, SELECTOR SWITCH SET TO PHONO POSITION UNLESS OTHERWISE NOTED. VOLTAGES TAKEN IN AM POSITION. VOLTAGES TAKEN IN FM STEREO POSITION. Circuit for M-1001 differs in some details. (Continued on pa

4、ge 120) STEP I 1FN) SEE PRELIMINARY 406E AOJ. TOP - 0 VOLTS OC ADJ.80T.-MAX AMPLITUDE P/P _IQ.TMC_ Alignment Procedure Chart M-1663,M-1664 a M-17O0 PRELIMINARY ALIGNMENT INFORMATION 1. Connect amplifier through isolation transformer to eliminate dangerous shock hazard. 2. Allow receiver and test equ

5、ipment 15 minutes to warm up and stabilize. 3. For AM Alignment A. Connect VTVM across one external speaker j ack, B. Use 30% modulation on generator for AM alignment. C Proceed with alignment steps as illustrated in alignment chart. 4. For FM Alignment - A. Connect FM generator, through a 72 ohm to

6、 300 ohm matching network, to antenna ter minals. B. Use 120KC sweep deviation for FM alignment. C. Keep generator output as low as possible throughout FM alignment procedure. D. Adjust top and bottom core of T2T, bottom core of L7 and bottom core of L8 for a sym metrical maximum amplitude *S* curve

7、 with 10.7 me marker in the middle. Qjrve mist be obtained in T2T with tuning slugs nearest to end of coil form. E. Add VTVM across scope connections to adjust only the top of L8. F. Proceed with alignment steps as illustrated in alignment chart. 119 收音机爱 好者资料库 RadioFans.CN AM CONV VOLUME R-25, MOST-OFTEN-NEEDED 1965 RADIO SERVICING INFORMATION s-a*? AUDIO PWR AMP AM-FM IF FM W Bottom Perma-Circuit View Parts Location 收音机爱 好者资料库 RadioFans.CN