United-Motors-Service-Delco-987893 电路原理图.pdf

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1、VOLUME R-19, MOST-OFTEN-NEEDED 1959 RADIO SERVICING INFORMATION TREADLE ARM OLDSMOBILE 989171 Material below and the page adjacent at right is exact for Oldsmobile 989171. The following sets are practically the same electrically. BUICK 981969, CHEVROLET 987893, PONTIAC 988977 HIGH FREQUENCY ALIGNMEN

2、T SETTING 30 OLDSMOBILE 989171 PRINTED CIRCUIT SHOWN IN HEAVY LINES 收音机爱 好者资料库 RadioFans.CN VOLUME R-19, MOST-OFTEN-NEEDED 1959 RADIO SERVICING INFORMATION DELCO OLDSMOBILE 989171 (Continued) For list of similar models, see preceding page. CIRCUIT BOARDPRINTED VIEW CIRCUIT BOARDPARTS VIEW SIGNAL SEE

3、KING TUNER ALIGNMENT PROCEDURE NOTE: When aligning the signal seeker tuner type radio, be sure to use a vacuum tube voltmeter as indicated. Output Meter Connection.VTVM from AVC line (#27 Island-Circuit Board) To Chassis Generator Return.Receiver Chassis Dummy Antenna. .In Series With Generator Sens

4、itivity Control.Maximum Volume Control.Maximum Volume Tone Control.Treble WHITE NUMBERS ON PRINTED CIRCUIT DRAWING CORRESPOND TO THE ENCIRCLED NUMBERS ON SCHE MATIC. RECEIVER PARTS LAYOUTTOP VIEW Generator Output.Not to exceed 2 volts at VTVM RECEIVER PARTS layoutbottom view STEP DUMMY ANTENNA CONNE

5、CT SIGNAL GENERATOR TO SIGNAL GENERATOR FREQUENCY TUNE RECEIVER TO ADJUST IN SEQUENCE FOR OUTPUT INDICATED l 0.1 Mfd. 12AD6 Grid (Pin 7) 262 KC High Frequency Stop A, B, C (Max.), D (Min.) 2 .000068 Mfd. Antenna Connector 1615 KC High Frequency Stop *E, F, G (Max.) 3 .000068 Mfd. Antenna Connector 6

6、00 KC Signal Generator Signal J, K (Max.) 4 .000068 Mfd. Antenna Connector 1615 KC Signal Generator Signal F, G (Max.) 5 .000068 Mfd. Antenna Connector 1100 KC Signal Generator Signal *L To tune to high frequency, put a .070 feeler gauge in slot against the high frequency stop. (See Page 30. De pres

7、s station selector bar and allow the treadle bar arm to run against the feeler gauge. Turn the radio off and then back on. This positions the tuner near the point where the treadle switch closes. Before making this adjustment, check the setting of oscillator core “H.” The rear of the core should be

8、1% from the mounting end of the coil form. This measurement is readily made by inserting a suitable plug in the mounting end of the coil form. The core adjustment is made from the mounting end of the coil form with a non- metallic screwdriver. *“L” is the pointer adjustment slot on the pointer assembly adjust so pointer reads 1100 KC. With the radio installed and the antenna plugged in, adjust the antenna trimmer “G” for maximum volume with the radio tuned to a weak station between 600 and 1000 KC (see sticker on case.) _ 3 收音机爱 好者资料库 RadioFans.CN