United-Motors-Service-Delco-988671 电路原理图.pdf

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1、I2AF6 I2AD6 I2AF6 I2F8 R F AMP OSC.-MOD. I.F.AMP OET-AUD. VOLUME R-18, MOST-OFTEN-NEEDED 1958 RADIO SERVICING INFORMATION PONTIAC MODEL 988671 (Alignment and other service material is on page 39) _,o v TiH -qj r1 LJ . . , 1 Q. IHfil ?Ms frj Itl jg *(a)L- teiHi 2 , - HO 000:52 5 OuO s igSi 4 * -Ssii

2、UJ Mg jJ*0N 3 z5 9S0 w g?!82b22?5Ss S ggSsie ffiPfeS III DOa* _i lldl9 &2“ SS5| 58=4? SoSUSJO-1 K ISiSSls S 38 收音机爱 好者资料库 RadioFans.CN VOLUME R 18, MOST-OFTEN-NEEDED 1958 RADIO SERVICING INFORMATION PONTIAC MODEL 988671 (Continued from page 38) TROUBLE SHOOTING THE OUTPUT STAGE A quick way to determ

3、ine that the 2N173 is conducting can be made by checking the collector voltage, from tran sistor case to the radio ase. If no voltage is present the transistor is not conducting or the transistor heat radiator is grounded to the radio case. If the voltage at the col lector is higher than listed the

4、transistor is conducting too heavily (check with milliammeter) or the output trans former is open. The amount of current the transistor conducts is determined by the voltages at each elem nt, the resistor in the base nd emitter circuits, the input transformer secondary resistance, and the transistor

5、 itself IsilLAr 1 i f Adjust in Sequence For Max. Output Q - O U W O kJ . B . * (0 - i-S fc, * w S U pc 0 c 3 H lj i . c c a 2 CD Qj d 4J rt 3 3Jr3- cr cr cr 2 QJ aj C nj C u, CD CD ih ii, o o -e -e -e - 5P 5P c 60 c x to x cE c7 rm 1 Signal Generator Frequency 262 KC 1615 KC 600 KC 1615 KC 1000 KC Connect to 12BE6 Grid (Pin #7) Antenna Connector Antenna Connector Antenna Connector Antenna Connector Series Capacitor or Dummy Antenna 0.1 Mfd. 0.000047 Mfd. 0.000047 Mfd. 0.000047 Mfd. 0.000047 Mfd. Steps 3“ V 39 收音机爱 好者资料库 RadioFans.CN