United-Motors-Service-Delco-988837 电路原理图.pdf

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1、VOLUME R-18, MOST-OFTEN-NEEDED 1958 RADIO SERVICING INFORMATION SCHEMATIC DATA ! B B Voltages measured terminal to chassis with a VTVMno signal. The HH portable unit voltages are taken with a battery voltage of 5.3 volts. uBHI Rack unit voltages taken with 12 volts at Illus. 46. Oscillator Base volt

2、age taken with set tuned to 1000 Kc. PONTIAC RADIO MODEL 988837 Total A Drain or Portable 7.6 ma OLDSMOBILE Model 989131 is similar. Resistances are 20%. Ohmmeter reading in transistor circuits are (Continued on page 47 at right) affected by meter battery polarity. Check in both directions and use h

3、ighest reading. 2N150 R F AMP R-64 A G C AMP PRINTED CIRCUIT SHOWN IN HFAVY LINES m m R. R= R. R Rr R. R R R R R R R YAX ! :/V CA AgAhA AkA l A mA iV vfiiGpQ n GDvf nrni PONTIAC 988837 46 收音机爱 好者资料库 RadioFans.CN PONTIAC Radio Model 988837, OLDSMOBILE 989131 very similar. (Continued from page 46, at

4、left) 1958 RADIO SERVICING INFORMATION PARTS LAYOUTBOTTOM VIEW WHITF NUMBERS ON PRINTED CIRCUIT DRAWINGS CORRESPOND TO ENCIRCLED NUMBERS ON SCHEMATIC DIAGRAM. ALIGNMENT PROCEDURE: DUMMY ANTENNA (METHOD OF CONNECTING GENERATOR) CONNECT GENERATOR TO SIGNAL FREQUENCY TUNE RECEIVER TO ADJUST IN SEQUENCE

5、 FOR MAX OUTPUT 0.1 Mfd. Cap. Pick Up Loop Pick Up Loop Pick Up Loop Pick Up Loop Pick Up Loop Pick Up Loop .000068 Mfd. - - ,i Mixer 2N149 Base (Island #49) By Induction to Antenna By Induction to Antenna By Induction to Antenna By Induction to Antenna By Induction to Antenna By Induction to Antenn

6、a Antenna Connector 262 KC. 1615 KC. 1000 KC. 1615 KC. 600 KC. 1400 KC. 1100 KC 1000 KC. High Frequency Stop High Frequency Stop Signal Generator Frequency High Frequency Stop Signal Generator Frequency Signal Generator Frequency Signal Generator Frequency Signal Generator Frequency A, B. C, D* E, F

7、, G* J F K* Gtt Pt Lttt with the radio tuned to a weak station between 6()0 and 10()0 KC. I F. cores origmally in radio are cemented in position and cannot be aligned. Replacement parts should be aliened with a non-metallic tool. *Before making these adiustments, check mechanical setting of three tu

8、ner cores H J and L The rear nf rh should be 1-11/32 from the back of the coil form. *Adjustment is made by changing antenna coil position on core t Adjust pointer to read ll on dial. ttTrimmer on gang capacitor tttThis step is needed only when antenna coil or core is replaced The portable unit must be in the rack and the cover on portable and cover on rack must be removed to make this adjustment. 47 收音机爱 好者资料库 RadioFans.CN