United-Motors-Service-Delco-989172 电路原理图.pdf

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1、DS-21 CONVERTER VOLUME R-19, MOST-OFTEN-NEEDED 1959 RADIO SERVICING INFORMATION BUICK 981970 OLDS MOBILE 989172 PONTIAC 988978 Continued on the next page, adjacent at right. SCHEMATIC DATA Voltages measured terminal to chassis with a VTVMno signal. The portable unit voltages are taken with a battery

2、 voltage of 5.2 volts. Rack unit voltages taken with 12 volts at Ulus. 37. Total “A” Drain in Car 1.3 amps. Total “A” Drain of Portable 6 ma. Tolerance on Voltage 10%. Resistances are 20%. Ohmmeter reading in transistor circuits are affected by meter battery polarity. Check in both directions and us

3、e highest reading. *Before measuring transistor voltages, the shorting type speaker socket must be opened and a 4 ohm speaker connected. If transistor is replaced, adjust bias potentiometer (Illus. 84) to obtain proper col lector voltage with 12 volts input to radio. *Illus. 77 is a fuse resistor fo

4、r the DS 501 transistor. An open fuse resistor will cause 0 volts at transistor collector. SH 5 03 | -siF-i k ITU *1 r rs fS * 20 收音机爱 好者资料库 RadioFans.CN VOLUME R-19, MOST-OFTEN-NEEDED 1959 RADIO SERVICING INFORMATION Method Of Connecting Generator Connect Generator To Signal Frequency Thru .1 mfd.

5、Cap. Converter Base (Island 5) Pick up loop Do not use Pick up loop By induction to antenna Align on noise (Lights, razor, etc.) By induction to antenna 1400 KC Tune Receiver To High freq. stop High freq. stop Near 600 KC Signal Gen. freq. Adjust In Sequence For Max. Output A, B, C, D iE Trimmer on

6、variable (near est batteries) F Trimmer on variable (near est vol. con trol) G If it is necessary to align pushbutton tuner, connect portable to it and follow the steps below. .000068 mfd. Cap. Antenna connector 1615 KC High freq. stop *M, N, P .000068 mfd. Cap. Antenna connector 600 KC Signal Gen.

7、freq. J, K .000068 mfd. Cap. Antenna connector 1615 KC Signal Gen. freq. N, P .000068 mfd. Cap. Antenna connector 1000 KC Signal Gen. freq. L* Before making this adjustment, check mechanical setting of oscillator core “H,” with radio tuned to high frequency limit. The rear of the core should be 1% f

8、rom the mounting end of the coil form. (This measurement is readily made by inserting a ruled plug in the rear of the coil form.) L is the pointer adjustment screw which is on the connecting link, between the pointer assembly and the parallel guide bar. It should be adjusted so that the dial pointer corresponds with the 1100 KC mark on the dial. 收音机爱 好者资料库 RadioFans.CN