Philco-Radio-and-Television-Corp-D-598 电路原理图.pdf

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1、NOTES ALL COMPONENTS MARM(o WITH ASTERISK ARC CONTAINED IN I UNIT C? ALL VOLTAGES MEASURED WiTM A 20.000 OHMS PER VOLT VOLTMETER BETWEEN POINTS INDICATED AND G M NUS AT A LINE VOLTAAC OF MTV AC OSCILLATOR GRID VOLTAGE MEASURED ACROSS Ri WITH A IOO OOO OHM ISOLATING RESISTOR IN SERIES WITH METER ALL

2、RE$i5TOR VALUES ARE IN OHMS AND All CONDENSER VALUES IN UUf UNLESS OTHERWISE INDICATED NOlCATES LESS THAN I OHM X INDICATES ClOCR SOCKET CONNECTIONS Above is an exact circuit for Models D-592, D-593, and D-595. For differences in Models D-727, D-728, D-730, and D-736, refer to clock circuit in inser

3、t above. Model D-598 uses a neon lamp as an off-on indicator, and incorporates a phono- input jack, a variable tone control, and a radio-phono switch. ALIGNMENT PROCEDURE RADIO CONTROLS Set volume control to maximum. Set tun ing control as indicated in chart. OUTPUT METER Connect across voice-coil t

4、erminals. SIGNAL GENERATOR Connect generator and set frequency as indicated in chart. Use modulated output. OUTPUT LEVEL During alignment, adjust signal generator out put to hold output meter reading below .5 volts. ALIGNMENT CHART SIGNAL GENERATOR RADIO ADJUST CONNECTION TO RADIO DIAL SETTING DIAL

5、SETTING SPECIAL INSTRUCTIONS Ground lead to B; output lead through a .1 mf. condenser to grid (pin 7) of I2BE6. 455 KC Tuning gang fully open. Adjust tuning cores, in order given, for maximum output. TCI and TC3 are located at top of transformers. TC42nd i-f sec. TC32nd i-f pri. TC21st i-f sec* TCI1

6、st i-f pri. Radiating loop (See note below). 1620 KC 1620 KC * Adjust trimmer for maximum output. Cl Bosc. Same as Step 2. 1500 KC 1500 KC Adjust trimmer for maximum output. Cl-Aaerial NOTE: Make up a 6-8 turn, 6 inch diameter loop from insulated wire, connect to signal generator leads, and place ne

7、ar radio loop* For proper adjustment ol the oscillator trimmer, fully open the tuning gang and insert a .006 inch non metallic shim between the heel of the rotor and the top of the stator plates. Close the tuning gang sufficiently to hold the shim in place, and then remove the shim without disturbing the gang setting. 106 收音机爱 好者资料库 RadioFans.CN