Philco-Radio-and-Television-Corp-T-66 电路原理图.pdf

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1、VOLUME R-21, MOST-OFTEN-NEEDED 1961 RADIO SERVICING INFORMATION PHILCO PORTABLE RADIO TRANSISTOR MODEL T-66, CODE 124 AUDIO OUTPUT (MATCHED PAIR) Iff cn - JW Ov - MV 4 V y flK - / r“ rx I n x v / i a? 5 v Jnd*IF AUDIO DRIVER c*2,F fE ; - r. = inf ,*i C 1.7*0 hi T*6 r3 .Av .64 sI . . i , ,r/ * _ 7- -

2、 P . T, * ? 3M-!. J TRI T- 1459 T-ID33 1ST IF CONV AMP 7-A. : 12 H - NOTE PIN 2 OF SWI TO POS TERM YEL. LEAD PIN I OF SWI PIN 4 OF SWI YEL LEAO T0 NE6 TERM REO LEAD SERVICE NOTES When signal tracing, inject signal at transistor collec tor and limit input to keep signal across speaker below .6 volt.

3、Normally, the transistors should be the last item sus pected If C9 opens serious audio oscillation will result. NOTE: Panel Removal Before panel can be removed from cabinet, a screw located next to the 2nd I-F transformer (C4 graph location) must be removed. Then depress clips on each side of cabine

4、t. Speaker will remain in cabinet. POSITION OF 6NO LE AO IS CRITICAL Composite Bottom View PIN 3 OF SWI RED LEAD T 0C9 MATCHED PAIR AUDIO OUTPUT TR | CONVERTER T-1033 SL _I ST-IF AMP ._ Z_. 1 T-1459 I i OV I g Jjl I LVf TR3 D TR4 2ND-IF AMP _ J AUDIO ORIVER 1 T-1460 JL? |et / T 003 ji ee ab view Sch

5、ematic Diagram of Model T-66, Code 124 from bh-ta6ES MCaSURED -poo* T-66, Code 126: TRl, Converter Transistor changed to T-1877, “*T s ibnl.UvolEcon. T2, 1st i-f Transformer changed to Part No. 32-4800-2. AT ,s 11 “* ALIGNMENT CHART SIGNAL GENERATOR CONNECTION TO RADIO DIAL SETTING Connect signal ge

6、nerator through a .1-uf. condenser to ant section of gang 455 kc. Use radiating loop (See NOTE 1 below) 600 kc. Same as step 2. 1620 kc. Same as step 2. 1400 kc. DIAL SETTING SPECIAL INSTRUCTIONS Tuning gang Adjust for maximum output T43rd I-F fully open. in order given, T32nd I-F T2 1st I-F Adjust

7、for maximum output. Tlosc. core Rock tuning gang while mak ing this adjustment. 1620 kc. Adjust for maximum output. CiBosc (Tuning gang trimmer fully open) 1.400 kc. Adjust for maximum output. Cl Aantenna trimmer Repeat steps 2, 3 and 4 until no further improvement is obtained. Always stop on step 4. NOTE 1 Use a 6-to-8-4urn, 6-inch-diameter loop made up of insulated wire Connect to generator terminals, and place about one foot from radio loop. 收音机爱 好者资料库 RadioFans.CN