Philco-Radio-and-Television-Corp-C-663 电路原理图.pdf

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1、MANUAL OF 19SS MOST-OFTEN-NEEDED RADIO DIAGRAMS PHILCO PORTABLE RADIO MODEL C-663 I I OHMS 1 DCT-/HC-HT MJMO cowcricr -fk_/V io KT-WC-or WOO CONVCRTCR A- (MAT or All ALIGNMENT PROCEDURE Dial Indicator Before alignment, the dial knob should be set as follows: with the condenser gang plates fully mesh

2、ed, the first knob marking (past the 550 KC point) should be perpendicular to the front of the chassis. Output Indicator Connect a 1000-ohms-per-volt a-c vpltmeter or an oscilloscope across the voice-coil terminals. Signal Generator Use an AM r-f signal generator. Connect the ground lead to B, and c

3、onnect the output lead as indicated in the alignment chart. SIGNAL GENERATOR | CONNECTION TO RADIO DIAL SETTING Connect signal generator through a .1 mid condenser to pin 6 (converter grid) of 1R5. 455 kc. Use radiating loop (See note one below). 1620 kc. Same as step 2. 1400 kc. Same as step 2. 600

4、 kc. I RADIO DIAL SETTING SPECIAL INSTRUCTIONS Tuning gang fully open. Adjust for maximum output in order given. 1620 kc. (See note 2 below). Adjust for maximum. 1400 kc. (Tune for signal.) Adjust for maximum. 600 kc. (Tune for signal.) Adjust for maximum output. Rock tuning gang while making this a

5、djustment. TC3 1st I-F sec. TC21st I-F pri. C1Bosc. trimmer nt. trimmer Repeat steps 2, 3, and 4 until no further improvement is noted. NOTE 1: Use a 6- to -8 turn, 6 inch diameter loop made up oi insulated wire. Connect to generator terminals, and place about one foot from radio loop. NOTE 2: pie t

6、uning condenser can be set to the proper frequency for the oscillator adjustment as follows: Fully open the tuning gang and him in place, and then remove the shim without disturbing the gang setting. !5 S 9999? & NOTES: R20 wired between positive A battery terminal and the flashlight socket assembly. Jumpers are indicated by solid lines. 69 收音机爱 好者资料库 RadioFans.CN