Zenith-Radio-Corp-3B32 电路原理图.pdf

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1、177 收音机爱 好者资料库 RadioFans.CN VOLUME R-20, MOST-OFTEN-NEEDED 1960 RADIO SERVICING INFORMATION ZENITH MODEL SF2530 CHASSIS 9B26-3B32 Alignment Information (Continued from page 177) /i SP.2 5* PH SPEAKER ( TWEETER) SP I 12* PM. SPEAKER (WOOFER) C5D B G. OSCILLATOR TRIMMER 1600 KC. L4 f.M.OSCILLATOR COIL

2、 9BMC. TUNING SELECTOR SWITCH RECORD COMPENSATOR SWITCH- 9B26 1- PULL-ON PUSH-OFF BASS CONTROL -LOUDNESS CONTROL 1STEREO BALANCE CONTROL ALIGNMENT PROCEDURE 3B32 CONNECT OSCILLATOR TO DUMMY ANTENNA INPUT SIGNAL FREQUENCY BAND SET DIAL TO ADJUST PURPOSE 1 Pin 2 on 12AT7 Mixer .05 mfd. 455 Kc., 400 Cy

3、cle Modulated AM 600 Kc. L10,ll,13,16 & 17 Align I.F. channel for maximum output. 2 TWO TURNS LOOSELY COUPLED TO WAVEMAGNET .05 mfd. 1600 Kc. 400 Cycle Modulated am 1600 Kc. C5D Set oscillator to dial scale. 3 .05 mfd. 1400 Kc. 400 Cycle Modulated AM 1400 Kc. C5B Align antenna stage. 4 IMPORTANT: Be

4、fore attempting to align the FM portion of this receiver the Band switch should be turned to “FM. 5(a) Pin 1 (grid) on 6AU6 limiter .05 mfd. 10.7 Me. Unmodulated FM L18 Align primary of discriminator for maximum reading. 6(b) Pin 1 (grid) on 6AU6 limiter .05 mfd. 10.7 Me. Unmodulated FM L19 Adjust s

5、econdary of discriminator for zero reading. 7(c) Pin 1 (grid) on 6BA6 2nd IF .05 mfd. 10.7 Me. Unmodulated FM L14.15 Align 3rd I.F. transformer for maximum reading. A 8(c) Pin 1 (grid) on 6BA6 1st IF .05 mfd. 10.7 Me. Unmodulated FM L12 Align 2nd I.F. transformer for maximum reading. 9(c) Pin 2 on 1

6、2AT7 Mixer .05 mfd. 10.7 Me. Unmodulated FM L8,9 Align 1st I.F. transformer for maximum reading. 10(c) REPEAT STEPS 7,8 & 9 11 (c) Antenna Post FM (Remove line antenna) 270 ohms 98 Me. Unmodulated FM 98 Me. L4 Osc. Coil Slug. Set oscillator to dial scale. 12(c) (0 Antenna Post FM (Remove line antenna) 270 ohms 98 Me. Unmodulated FM 98 Me. L7 Det. Coil Slug. Align det. stage to maximum reading. - RECTIFIER 7 CONTACT CONNECTOR SOCKET 178 收音机爱 好者资料库 RadioFans.CN