Galvin-Mfg-Co（Motorola）-406 电路原理图.pdf

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1、VOLUME R-19, MOST-OFTEN-NEEDED 1959 RADIO SERVICING INFORMATION MOTOROLA Bi|2 S GROUND ELECTRICAL SYSTEM - RED LEAD MUST BE SOLDERED TO TERMINAL NO. 1: BLACK LEAD TO TERMINAL NO. 2. RADIO POLARITY - BEFORE CONNECTING RADIO TO A 6 VOLT POWER SOURCE, REMOVE BOTTOM COVER AND CHECK POLARITY WIRING AGAIN

2、ST DETAIL. THEN CONNECT RADIO TO POWER SOURCE PER DETAIL. IF THIS RECEIVER IS NOT PROPERLY CONNECTED, IT WILL NOT OPERATE AND DAMAGE TO COMPONENTS MAY RESULT. OUTPUT TRANSISTOR CURRENT ADJUSTMENT - After an output transistor has been replaced, the collector cur rent should be checked and adjusted fo

3、r proper operation. a. Connect a 3amp DC ammeter in series with the A lead. b. Remove output transistor from its socket. c. Turn radio on and read ammeter with 6.3 volts in put to A” lead (approximately 2.0 amp). NOTE READING. d. Turn radio off and replace transistor e. Turn radio on and adjust R-14

4、 for a 600 ma increase over reading noted in step c with 6. 3 volts input to A lead. - NOTE: Two values of radio input voltage are given as a convenience to service personnel in order to accommodate different power sources. The current value of 720 ma stated on the schematic is for 7 volts DC input to receiver “A lead. s Q- Q - 0 o o o o -o Oo ffG-0 3Ka8A8 74 收音机爱 好者资料库 RadioFans.CN