Philco-Radio-and-Television-Corp-T-803 电路原理图.pdf

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1、VOLUME R-22, MOST-OFTEN-NEEDED 1962 RADIO SERVICING INFORMATION PHILCO PORTABLE RADIO MODEL T-803, CODE 124 -Sis. Tri i r j ”t i h 1 4 1 j W- j, J Ifjl 1 53 A 3 I Ife IS R30 1 Jl REAR V EW ALIGNMENTConnect an a-c voltmeter or oscillo scope across speaker voice-coil. Connect ground lead of AM r-f sig

2、nal generator to chassis; output lead as indicated in chart. Keep voltage across voice coil below 1.5 volts (reduce generator output). SIGNAL GENERATOR RADIO STEP CONNECTION TO RADIO DIAL SETTING DIAL SETTING SPECIAL INSTRUCTIONS ADJUST 1 Connect signal generator through a l-uf. condenser to ant. se

3、ction of gang. 455 kc. Tuning gang fully open. Adjust for maximum output in order given. T43rd i-f pri. T32nd i-f pri T2bot. core T2 lop core 2 Use radiating loop. (See NOTE 1 below). 600 kc. 600 kc. Adj. for maximum output. Rock tuning gang while making adj. Tlocs core 3 Same as step 2. 1620 kc. 16

4、20 kc. (Tuning gang fully open) Adjust for maximum outpui. ClBosc. trim. 4 Same as siep 2. 1400 kc. 1400 kc Adjust for maximum output. CIAant. trim. 5 Repeat steps 2, 3 and 4 until no further improvement is oblained. Always stop on step 4 NOTE 1. 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. Component Layout, Bottom View_,UD0IJT sffyF%E 79 收音机爱 好者资料库 RadioFans.CN