Galvin-Mfg-Co（Motorola）-BKA6T 电路原理图.pdf

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1、VOLUME R-17. MOST-OFTEN-NEEDED 1957 RADIO SERVICING INFORMATION MOTOROLA MODEL 1. RADIO POLARITY - When servicing this radio on the service bench, be sure that the radio housing is connected to the negative side of the power source and that the A .lead connects to the positive side. 2. TRANSISTOR RE

2、PLACEMENT - When replacing a tran sistor, be sure that the transistor contacts are connected as follows: the lead from the driver transformer T-3 to the base terminal.; the lead from the output transformer T-4 to the emitter terminal; the collector is automatically groun ded when the transistor is m

3、ounted to the heat radiator. The schematic diagram shows the position of the transistor electrodes as viewed from the terminal side. Care should be taken when mounting the transistor to the heat.radiator; if not securely mounted, the transistor may be damaged from lack of proper heat dissipation. NO

4、TE: When a tran sistor is replaced, the emitter current should be checked. (See EMITTER CURRENT ADJUSTMENT). 3. EMITTER CURRENT ADJUSTMENT-To adjust the emit ter current, insert a milliammeter in series with the emit ter electrode. This can be done by unplugging emitter lead and connecting positive

5、side of milliammeter to lead, and negative side to transistor emitter terminal. Adjust the variable 500 ohm resistor R-23 for 480 ma emitter current. Note: This milliammeter should be a quality instrument with law internal resistance of l ohm max. W OS H w D “5 Q O H H U w U TJ tf g O o c H Z a & wa

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8、ent at right) 收音机爱 好者资料库 RadioFans.CN VOLUME R-17, MOST-OFTEN-NEEDED 1957 RADIO SERVICING INFORMATION PLUG TO FIT RECEIVER ANTENNA RECEPTACLE 16OMMF TO RECEIVER -ANTENNA RECEPTACLE TO SIGNAL GENERATOR Model BKA6T Alignment Adjustments and Parts Location Continued from preceding page at left. I METAL

9、 SHIELD CAN I MUST BE ATTACHED TO PLUG DUMMY ANTENNA LL u * L3 CONNECTIONS ALIGNMENT ADJUSTMENTS AND PARTS LOCATION T 7 i L c. 65 CAUTION A LEAD MUST BE CONNECTED TO POSITIVE SID! V POWER SUPPLY RAD IO WILL NOT OPERATt OR DAMAGE TO COMPONENTS WILL RESULT IF CONNECTIO OTHERWISE 收音机爱 好者资料库 RadioFans.CN