Galvin-Mfg-Co（Motorola）-OEA60X 电路原理图.pdf

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1、VOLUME R-21, MOST-OFTEN-NEEDED 1961 RADIO SERVICING INFORMATION MOTOROLA auto radio MODEL OEA60X ANT CORE (10). 1200 KC OSC CORE (8) 1200 KC JO a -fFo Jjua In CAPACITORS Decimal values in ME. all others m MMF unless otherwise specified. VOU/GfS - Measured (mm point indicated to rhajsis with aVTVM. N

2、o signal input. Tolerance +10%. INPUT VOLTAGF - 14V DC. TUNING RANGE - 540 KC to 1610 KC. IF FREQ. - 2.5 KC. BO 7) 1610 KC ANT TRIM 5) 1610 KC OSC TRIM O TOP 1ST IF T) BOT 262.5 KC 0 TOP 2ND IF (3) BOT 262.5 KC ALIGNMENT LOCATION DETAIL A LEAD MUST BE CONNECTED TO POSITIVE (+ SIDE Of POSHER SUPPLY.

3、RADIO WIU. NOT OPERATE AND DAMAGE TO COMPONENTS WILL RESULT IF CONNECTED OTHERWISE. BASE EMITTER COLLECTOR 500MF BASE TRANSISTOR CONN TYPE - Automotive type superheterodyne receiver designed for custom installation in the I960 Oldsmobile cars. TO SET PUSHBUTTONS Pushbuttons may be set up in any orde

4、r. However, for convenience in remembering, it is suggested that stations be set up in frequency sequence from left to right. During pushbutton set-up, the antenna should be fully extended and antenna trimmer properly peaked at 1400 Kc, 1. Turn receiver on and allow it to operate for fifteen min ute

5、s. 2. Unlock pushbuttons by pulling them out with your fingers. In the unlocked position, button will extend about 1/2 for ward of its normal position. 3. Accurately tune in station desired for pushbutton setup. 4. Lock one of the pushbuttons to this station by pushing it in firmly. 5. Repeat steps

6、3 A 4 for remaining pushbuttons SERVICE NOTES 1. RADIO POLARITY - WHEN SERVICING THIS RECEIV ER,THFWA,nLEADMUST BE CONNECTED TO THE POS ITIVE SIDE OF THE POWER SOURCE. IF CONNECTED OTHERWISE, RECEIVER WILL NOT OPERATE AND DAM AGE TO COMPONENTS MAY RESULT. 2. POWER SUPPLY REQUIREMENTS - It is prefera

7、ble to use a storage battery (without a battery charger) in place of a battery eliminator. If a battery eliminator is used, it must be well regulated and filtered. 3. POWER TRANSISTOR REPLACEMENT - When replacing a power transistor, be sure transistor insulator is in place and well greased and that

8、the mounting screws are securely and evenly tightened. Use only the transistor specified in the Replacement Parts List for replacement. See Notes 4 A 6. 4. POWER TRANSISTOR INSULATOR - When replacing a power transistor or power transistor insulator, be sure to coat both sides of insulator with DC-4

9、grease (Motorola Part No. 1 1M490487) to insure proper heat dissipation. 5. DRIVER TRANSISTOR REPLACEMENT - When replacing a driver transistor, grasp the transistor leads (between the transistor body and soldering lug) with a pair of long nose pliers to prevent excessive heating of transistor body d

10、uring soldering operation. 6. POWER TRANSISTOR CURRENT ADJUSTMENT - After a power transistor has been replaced, the collector current should be checked and adjusted for proper operation. a. Insert a low range (0-1 or 0-2 amp) DC ammeter in the primary ground return lead of the output transform er (T

11、4), Connect the negative post of the meter to ground. CAUTION: Be sure the speaker ground lead is connected in common with the transformer ground lead to the posi tive meter terminal (see schematic). b. Turn the radio on and allow it to heat up for about 15 minutes. c. Adjust R20 for a reading of 36

12、0 ma with 12.6 volts in put to the radio “a” lead. NOTE: Two values of radio input voltage are given as a convenience to service personnel in orde r to accomodate different power sources. The current value stated on the Schematic Diagram is for 14 volts input to the “a” lead. 76 收音机爱 好者资料库 RadioFans.CN