Montgomery-Ward-and-Co-25WG-1571B 电路原理图.pdf

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1、MANUAL OF 19S2 MOST-OFTEN-NEEDED RADIO DIAGRAMS 收音机爱 好者资料库 RadioFans.CN MANUAL OF 19S2 MOST-OFTEN-NEEDED RADIO DIAGRAMS MONTGOMERY WARD Models 25WG-1570B be used by reverting the meter cannec. tions far negotive readings). Dummy Antennas and I-F Loading Resistor2500 mmf, 300 ohms Allow chassis and s

2、ignal generator to Heat Up for several minutes. SIGNAL GENERATOR THROUGH DUMMY ANTENNA BAND SWITCH SETTING GANG CONDENSER SETTING ADJun ADJUST FOR FREQUENCY SETTING CONNEa GENERATOR OUTPUT TO Discriminator 10.7 MC 6BA6 2nd I-F Pin 1 and Chassis 2500 mmf FM Rotor Fully Open Disc. Pri. (5) Note A Maxi

3、mum Deflection 10.7 MC 6BA6 2nd i-F Pin 1 and Chassis 2500 mnrf FM Rotor Fully Open Disc. Sec. (6) Nate B i-F 10.7 MC Note C 6BA6 1st I-F Pin 1 and Chassis 2500 mmf FM Rotor Fully Open 2nd I-F Pri. (7) Sec. (8) Note D Maximum Deflection Discriminator 10.7 MC 6BA6 1st I-F Pin 1 and Chassis 2500 mmf F

4、M Rotor Fully Open Disc. Pri. (5) Note D Maximum Deflection i-F 10.7 MC Junction C-32A & B (Dual 100 mmf cond.) And chassis 2500 mmf FM Rotor Fully Open Isl I-F Pri. (9) & Sec. (10) 2nd I-F Pri. (7) & Sec. (8) Disc. Pri. (5) In Order Shown Note D Maximum Deflection 10.7 MC Same as above 2500 mmf FM

5、Rotor Fully Open Disc. Sec. (6) Note B RECHECK i-F ADJUSTMENTS IN ORDER GiVEN Oscillator 108.5 Disconnect the honk anten na and connect generator to dipole terminals with re sistor in series. 300 ohms FM Rotor Fully Open Ofc. C-25 Deflection Maximum Antenna 104.5 Same as above 300 chms FM Tune rotor

6、 for max. AVC voltage Ant. C-39 Maximum Deflectior RECHECK ANTENNA & OSC. ADJUSTMENTS iN ORDER GiVEN FM ALIGNMENT NOTES NOTE AThe zero center scale DC vacuum tube voltmeter is to be connected between chassis ground and the AVC line. A signal af .1 volt must be fed into the receiver for this adjustme

7、nt. Note output voltage an the zero center DC vacuum tube voltmeter. BDisconnect zero center DC vacuum tube voltmeter from AVC and connect It at the audio takeoff point at the 27 K ohm resistor (R-10) and its junction with the terminal strip. Adjust for zero voltoge Indieotion. NOTE CAM coils must be aligned before attempting to align the FM i-F coils. NOTE DConnect zero center DC vacuum tube voltmeter os In Note A. Adjust Input to give same output on the zero center DC vacuum tube voltmeter as in Note A. 收音机爱 好者资料库 RadioFans.CN