General-Electric-Co-409 电路原理图.pdf

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1、MANUAL OF 19S2 MOST-OFTEN-NEEDED RADIO DIAGRAMS GENERAL ELECTRIC MODEL 409 A.MF.M. RADIO See next page, over, for alignment information. . a _J fiiplN L-A: M C4 C XI _ S c “ 2 I “sg S CO C 1 c-SS 8 3 ,2 c ” s w ! (U.3 2 - 43 3 3 *3 CO ! if |SS o ft *0 P 2 8 .S 2 3 a OJ W j: P CL O u fe 收音机爱 好者资料库 Ra

2、dioFans.CN MANUAL OF 19S2 MOST-OFTEN-NEEDED RADIO DIAGRAMS r F N F R A I FIFTTRiP AIETEX AUGNMENT notes “ 7 CLCwlfllw 5. Connect a vacuum tube voltmetM* hetwem tf nninf Model 409, continued. AM. MEia AUGNMEHT NOTES 1. Connect an output meter across the speaker leads to indicate maximum output during

3、 A.M. alignment. 2. Turn the volume control to maximum clockwise position and reduce signal input so that output meter does not indicate more than /2 watt output during A.M. alignment. 3. For alignment of the antenna trimmer C2 it is necessary to inductively couple the signal generator output to the

4、 loop antenna by connecting a four turn, six inch diameter loop of wire across the generator output terminals and locating the loop about one foot from the radio loop. The position of loop should not be changed during alignment to prevent possible errors in peak readings. 4. Set the band switch in A

5、.M. position. FJM. METEX AUGNMB4T NOTES 5. Connect a vacuum tube voltmeter between the test point on the rear of the chassis and chassis to read the d-c voltage developed at the limiter grid during F.M.-I.F. and R.F. align ment. Dress the V.T.V.M. leads away from the r-f end of the chassis to preven

6、t regeneration. Reduce the signal input so that the V.T.V.M. reads approximately 1 volt d-c. 6. Connect a vacuum tube voltmeter across the volume control to read the discriminator output. 7. To align the primary of T6 (discriminator) detune the signal generator slightly either side of 10.7 me mtil m

7、aximum d-c volts is read across the volume control then adjust the primary of T6 for max. 8. For F.M.-R.F. alignment the output impedance of the signal generator should be 300 ohms to properly match the input impedance of this receiver. 9. The cover on the F.M. tuner must be in place during F.M.- R.

8、F. alignment. 10. Set the band switch to the F.M. position. I C2004(0SC) l 6BJ6 i C2002(RF) METER ALIGNMENT CHART SIGNAL GENERATOR FREQUENCY 455 kc, 30% mod. with 400 cycles 1620 kc, 30% mod. with 400 cycles 1500 kc, 30% mod. with 400 cycles SIGNAL INPUT POINT BETWEEN TinSIING CAPACITOR SETTING BOTT

9、OM VIEW ADJUST A.M.I.F. ALIGNMENT Pin 1 of V4 (12BA6) thru .02 mf. and chassis Pin 1 of V3 (12AU6) thru .02 mf. and chassis Pin 1 of VI (6BJ6) Inductively coupled to the loop. See note 3 Fully closed Primary and secondary cores of T5 for maximum output meter reading Primary and secondary cores of T4

10、 for maximum output meter reading R.F. ALIGNMENT ignnmii (C4) oscillator trimmer for maxi mum output meter reading For maximum output meter reading R-f trimmer (C-3) for maximum output meter reading while rock ing gang condenser Adjust antenna trimmer (C2) on loop for maximum I.F. ALIGNMENT Pm 1 of

11、V4 (12BA6) thru 100 mmf. and chassis j Core of L3 for maximum d-c reading at test point on rear of chassis 10.7 me immodulated Pin 1 of V3 (12AU6) thru 100 mmf. and chassis Fully closed Cores of T3 for maximum d-c volts at test point on rear of chassis Stator of C2001 thru .02 mf. thru hole in botto

12、m of F.M. tuner cover Cores of T2 for maximum d-c volts at test point on rear of chassis 10.7 me unmodulated F.M. DISCRIMINATOR (T6) ALIGNMENT I Pin 1 of V4 (12BA6) thru c., Detune for maximum 100 mmf. and chassis Iuuy cioseu d-c at R16. See note 7 F.M.-R.F. ALIGNMENT At F.M. antenna ter- _ . minals

13、 with built-in F.M. antenna disconnected T6 secondary core for zero out put across volume control (R16) T6 primary core for maximum d-c volts across the volume con trol (R16) F.M. oscillator trimmer C2004 for maximum d-c volts at test point on rear of chassis F.M.-R.F. trimmer C2002 for maximum d-c volts at test point on rear of chassis while rocking signal generator frequency 收音机爱 好者资料库 RadioFans.CN 收音机爱 好者资料库 RadioFans.CN