United-Motors-Service-Delco-980744 电路原理图.pdf

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1、MANUAL OF 1948 MOST-OFTEN-NEEDED RADIO DIAGRAMS UNITED MOTORS SERVICE DIVISION OF GENERAL MOTORS CORPORATION Buiek Models 980744 and 980745 For diagram see page 175. PUSH BUTTON SET-UP Release holding spring in bottom of button, pull button off. Loosen re-set screw and push in until it bottoms. Tune

2、 in desired station while holding in re-set screw. Release and tighten screw. Replace button. ALIGNMENT PROCEDURE Volume Control Maximum. Signal Generator output minimum for satisfactory output indication. MODEL 980744 Connect To Tune Receiver Signal Generator Adjust Screws To Frequency In Order 6SA

3、7 Pin #8 No Broadcast Sig. 262 KC A B C D Antenna Connector Extreme Hi. Freq. 1615 KC E F G Antenna Connector End of Dial Signal Generator 1430 KC *J K Series Condenser or Connect To Dummy Antenna 0.1 Mfd. 6SA7 Pin #8_ *.000060 Mfd. Antenna Connector *.000060 Mfd. Antenna Connector * Before making t

4、his adjustment turn core screws J, K, H by means of a bakelite screwdriver, so that the rear end of the cores are lli from the rear of the coil form. The purpose of this adjustment is to set the cores at the correct starting point with respect to the windings. Cores J and K are adjusted by means of

5、a bakelite screwdriver through the rear end of the coils. There must not be any metal in part of screwdriver inserted in the coil. Should it he necessary to calibrate the pointer after this adjustment, tune signal generator to 1300 KC and ihe re ceiver to the signal. Loosen dial cord pulley set scre

6、ws and adjust pointer to 1300 KC. Tighten set screws. Adjust trimmer G to match car antenna (at approx. 1400 KC) when radio is installed. t,A ISEClfei Ho|pRI I Vt 1st I. F. TRANS. 8 * Mil PRI 30 2nd L F. TRAN TO QRK) 6V6GT, I2 ft 15 TO PLATE 6VW ft C0N0. *8 CONDUCTOR M , BLACK SLEEVING TO VOICE COIL

7、 CONDUCTOR IN BLACK SLEEVING TO GRID 6V6GT TO PLATE GV6GT TO GROUND ft cono. me AUDIO INPUT CHOKE AfJOJO OUTPUT (ft AUTOTRANSFORMER TRANSFORMER AUDIO PACK - DRIVER AND OUTPUT TRANS. GREEN TO 6SA7 PIN *8 rBROWN TO 6SA7 CATHODE PIN *6 I (RED TO _|la i I | COND. *4 I11“ gP BLUE TO*-1 RE COIL CONO. *2 5

8、0 174 j r sgH V _/ OSC. COIL 49 i JR.F COND. OSC I I 65 COND. | -YELLOW LOCATION DOT tol kxD amt mil GREEN TO 6SK7 ANT COIL GR|) p|N4 gLUE TO ANT SOCKET ANT COND. 6G TUNER COILS 收音机爱 好者资料库 RadioFans.CN MANUAL OF 1948 MQST-OFTEN-NEEDED RADIO DIAGRAMS CHASSIS VIEW United Motors Bulck Models 980744, 98

9、0745 See page 174 for more data a*?1 & Store V0LTAGE READINGS BETWEEN SOCKET TERMINALS AND 1 GROUND WITH O.C. VOLTMETER HAVING RESISTANCE OF 1000 OHMS -PER VOLT. ALL REAOlNCS TAKEN |_ WITH 6.0 VOLTS ACROSS HEATERS. CURRENT BRAIN WITH SPEAKER ANO OlAL LIGHT 7.S AMPERES. . l TOLERANCE ON VOLTAGES A 10*. 收音机爱 好者资料库 RadioFans.CN