RCA-Victor-Co-Inc-46X21 电路原理图.pdf

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1、MANUAL OF 1939 MOST POPULAR SERVICE DIAGRAMS Victor Models 46X21, 46X23, and 46X24 IZSAI DET-OSC. 12SQ7 Z*0LX-A.F-Ayc SOL next turn the oscillator screw entirely in and then gradually back out until the station is heard. (4) Adjust the R-F trimmer for maximum output. (Clockwise adjustment of oscilla

2、tor and R-F trimmers tunes the circuits to lower frequencies.) (5) By turning the set to a position in. which reception is weak a final more accurate adjustment may be made. (6) Adjust for each of the remaining stations in a similar manner a place corresponding station tabs in recesses above buttons

3、. A Dial Tuning” tab should be above button No. 6. Precautionary Lead Dress: (1) Dress all leads away from oscillator and antenna coils. (2) Dress cathode resistor (R4) and B+ lead across 12SK7 socket between plate and grid terminals. (3) (46X24 only) Dress leads to push button switch straight up an

4、d parallel so that they do not touch each other. (4) Dress black lead from Ist I-F transformer over green lead. (5) Keep platc-cathodc bypass (C43) of rectifier tube away from volume control. COMPILED BY M. N. Output Meter Alignment.Connect the meter across the voice coil And turn the receiver volum

5、e control to maximum. test-oscillator to the iw as possfble * pacitor, and keep the output as Rh eang condraser in full mesh, the pointer should be adjusted to a horizontal position. Antenna,-The set is equipped with a built-in loop antenna. If the Jnteiina terminal board link should be closed. Ihis

6、 link should be open when an external antenna is used Connect the external antenna to terminal 1. Connect high side of test oscillator to Tune test oscillator Turn radio dial to Adjust following for max. output Grid 12SK7 in series with 0.01 mfd. “A” Band C19 and C20 (2nd I-F Trans.) Grid 12SA7 in s

7、eries with 0.01 mfd. at 1,550 kc end of dial C13 and C14 (1st I-F Trans.) 600 kc “A” Band 600 kc CIS (OSC.) Antenna in series with 200 mmfd. 1,560 kc “A” Band Full ClockvHlse C8 (OSC.) 1,400 kc Resonance on 1,400 kc “A” Band C6 (ant.) Repeat steps 3 (rock in), 4 and 6 Antenna 18.5 kc ”C* Band Full Clockwise C17 (oac.) in aeries with 300 ohms 17.8 kc “C” Band Resonance on 17.8 kc C3 (ant.) 9 Repeat steps 7 and 8 * Use minimum capacity peak if two can be obtained. BEITMAN. SUPREME PUBLICATIONS 收音机爱 好者资料库 RadioFans.CN 收音机爱 好者资料库 RadioFans.CN