Montgomery-Ward-and-Co-15WG-2752D 电路原理图.pdf

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1、MANUAL OF 19S1 MOST-OFTEN-NEEDED RADIO DIAGRAMS Montgomery Ward Models 05WG-2751A., 05WG-2752B, etc. Continued on page 61 ALIGNMENT PROCEDURES AM STAGES The following is required for oligning; An All Wove Signol Generator Which Will Provide on Accurately Colibrated Signol ot the Test Frequencies os

2、Listed. Output Indicating Meter, Non-Metollic Screwdriver, Dummy Antennas .1 mf, and 50 mmf. FREQUENCY SETTI 455 KC SIGNAL GENERATOR CONNECT THROUGH GENERATOR DUMMY OUTPUT TO ANTENNA Control Grid .1 mf 1st 6BA6 Pin No. 1 Control Grid 6BE6 Pin No. 7 1st Det. Control Grid 6BE6 Pin No. 7 Control Grid 6

3、BE6 Pin No. 7 External mim Antenna Terminal CONNECT GROUND TO Chassis Base Chassis Base Volume Control Maximum all Adjustments. Connect Radio Chassis to Ground Post of Signol Generator with a Short Heavy Lead. Allow Chassis and Signal Generator to Heat Up for Several Minutes. GANG CONDENSER SETTING

4、Rotor Fully Open Rotor Fully Open 2nd I.F. Pri. (1) and Sec. (2) 1st I.F. Pri. (3) and Sec. (4) Turn Rotor to Max. Output. Set Pointer to 1400 KC See Note A Antenna C-2 Maximum Output Maximum Output Maximum Output NOTE AIf th pointer i not ot 1400 KC on tho diol, rowt pointer to th. 1400 KC mark on

5、tht dial scale. FM STAGES The following Is required for aligning: Zero An accurately calibrated signal generator providing unmodu- oppre lated signals at the test frequencies listed below. (If a Non-metallic screwdriver. vocus tions Dummy Antennas and l-F loading Resistor2500 mmf, 300 ohms Allow Zer

6、o center scale DC vacuum tube voltmeter having a range of approximately 3 volts. (If o zero center scale meter is not available, a standard scale vacuum tube voltmeter may be used by reversing the meter connec tions for negative reodlngs). Allow chassis ond signal generator to Heat Up for several mi

7、nutes. SIGNAL GENERATOR FREQUENCY SETTING Discriminator 10.7 MC 10.7 MC l-F 10.7 MC Not* C Discriminotor 10.7 MC l-F 10.7 MC 10.7 MC Oscillator 108.5 Antenna I 104.5 CONNECT GENERATOR OUTPUT TO 6BA6 2nd l-F Pin 1 and Chassis 6BA6 2nd l-F Pin 1 and Chassis 6BA6 1st l-F Pin 1 and Chassis 6BA6 1st l-F

8、Pin 1 and Chassis Junction C-32A & B (Dual 100 mmf cond.) And chassis Sam. as above THROUGH DUMMY ANTENNA BAND SWITCH SETTING 2500 mmf 2500 mmf 2500 mmf Rotor Fully Open Rotor Fully Open Rotor Fully Open Roter Fully Open Disc. Pri. (5) Maximum Nte A Deflection Disc. Sec. (6) Nate B 2nd l-F Pri. (7)

9、Maximum Sec. (B) Note D Deflection Disc. Pri. (5) Note D 1st l-F Pri. (9) & Sec. (10) 2nd l-F Pri. (7) & Sec. (B) Disc. Pri. (5) In Order Shown Note D Disc. Sec. (6) Note B _ RECHECK l-F ADJUSTMENTS IN ORDER GIVEN Disconnect built * in dipoie antenna and connect gen erator to dipole terminals with r

10、esistor in series. I So* * 300 ohms | fm | Tune rotor for I -_j_I max, AVC voltoge | _RECHECK ANTENNA & OSC. ADJUSTMENTS IN ORDER GIVEN Ant. C-39 FM ALIGNMENT NOTES NOTE A-The zero center scale DC vacuum tube voltmeter Is to be 77 % connected between chassis ground and the AVC line. strip A signal o

11、f .1 volt must be fed into the receiver for this adjustmeat. NOTE CAM Nate output voltage on the xero center DC vacuum the tube voltmeter. _ Maximum Deflection Maximum Deflection 300 ahms FM Rotor Fully 0c. C-25 Deflection -i Open Maximum Maximum Deflection 27 K ohm resistor (R-10) and its junction

12、with the terminal strip. Adjust for sera voltage Indication. NOTE CAM l-F coils must be aligned before attempting to align the FM l-F coils. OBDisconnect zero center DC vacuum tube voltmeter from AVC and connect It ot the audio takeoff point at the NOTE DConnect zero center DC vacuum tube voltmeter as in Note A. Adjust input to give same output on the zero center DC vacuum tubo voltmeter as in Note A. 收音机爱 好者资料库 RadioFans.CN 收音机爱 好者资料库 RadioFans.CN 收音机爱 好者资料库 RadioFans.CN