Montgomery-Ward-and-Co-05WG-2752 电路原理图.pdf

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1、MANUAL OF I9S0 MOST-OFTEN-NEEDED RADIO DIAGRAMS 1 WARDS MODEL 05WG-2752 m L iSs-ai 3 o$ fl MJJ 8 g? S3 _ _ Models -2751 and “T4- -2749 are almost j | the same as model ilUj-ti- described here, while Model -2748 is very similar. Alignment infor mation is given on the back of this page. *5 rai fjsjUbf

2、cJ HrttoWR ? ng irm 5 ?3 5 o S Vj 1 a ? l* g* “i QQlfsi *2 EJS j| fi -.It s iL5i| * I 1 S* yi! LfflasaJ | ? IMaJ Sfiforan! tlrUrowi o Sja j-L rl-5 ol A u j4 -ii la 4 a SgT l 13$ S O -1 = 收音机爱 好者资料库 RadioFans.CN MANUAL OF 19S0 MOST-OFTEN-NEEDED RADIO DIAGRAMS ALIGNMENT PROCEDURES MODEL 05WG-2752 AM S

3、TAGES The following is required for aligning: An All Wave Signal Generator Which Will Provide an Accurately Calibrated Signal at the Test Frequencies as Listed. Output Indicating Meter, Non-Metallic Screwdriver, Dummy Anfennos .1 mf, and 50mmf. Volume Control Maximum all Adjustment. Connect Radio Ch

4、assis to Ground Post of Signol Generator with o Short Heavy Lead. Allow Chassis ond Signal Generator to Heot Up for Severol Minutes. FREQUENCY SETTING 455 KC SIGNAL GENERATOR CONNECT I THROUGH 455 KC 1620 KC 1400 KC GENERATOR OUTPUT TO Control Grid 1st 6BA6 Pin No. 1 Control Grid 68E6 Pin No. 7 1st

5、Det. Control Grid 6BE6 Pin No. 7 Control Grid 6BE6 Pin No. 7 External Antenna Lead DUMMY ANTENNA .1 mf CONNECT GROUND TO Chassis 8ase Chossis Bose GANG CONDENSER SETTING Rotor Fully Open ADJUST FQR Maximum Output Moximum Output Turn Rotor to Max. Output. Set Pointer to 1400 KC See Note A Oscillofor

6、C-41 Antenna C-2 Moximum Output NOTE A If the pointer is not at 1400 KC on the dial, reset pointer to the 1400 KC morlt an the dial scale The following is required for oligning: An accurotely colibroted signol generotor providing unmodu lated signals ot the test frequencies listed below. Non-metolli

7、c screwdriver. Dummy Antennas ond l-F Loading Resistor-2500 mmf, 300 ohms SIGNAL GENERATOR FM STAGES Zero center scale DC vocuum tube voltmeter hoving a range of approximately 3 volts. (If a zero center icale meter is not ovoiloble, a stondord scol. vocuum tube voltmeter moy be used by reversing the

8、 meter connec- tions for negotive readings). Allow chassis and signol generotor to Heat Up for severol minutes. FREQUENCY SETTING 10.7 MC CONNECT GENERATOR OUTPUT TO THROUGH DUMMY ANTENNA 10.7 MC Note C Discriminotor l-F 10.7 MC 10.7 MC 6BA6 2nd l-F Pin 1 ond Chossis 2500 mmf ebise An All Wove Signo

9、l Generator Which Will Provide on Accurately Colibrated Signol ot the Test Frequencies os 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

10、 Pin No. 1 Control Grid 6BE6 Pin No. 7 1st Det. Control Grid 6BE6 Pin No. 7 Control Grid 6BE6 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.

11、Allow Chassis and Signal Generator to Heat Up for Several Minutes. GANG CONDENSER SETTING 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 Out

12、put NOTE AIf th pointer i not ot 1400 KC on tho diol, rowt pointer to th. 1400 KC mark on 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 sc

13、rewdriver. vocus tions Dummy Antennas and l-F loading Resistor2500 mmf, 300 ohms Allow Zero 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

14、tions for negative reodlngs). Allow chassis ond signal generator to Heat Up for several minutes. 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

15、 1 and Chassis 6BA6 2nd l-F Pin 1 and Chassis 6BA6 1st l-F Pin 1 and Chassis 6BA6 1st l-F 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

16、Fully Open Disc. Pri. (5) Maximum Nte A Deflection Disc. Sec. (6) Nate B 2nd l-F Pri. (7) 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 GI

17、VEN Disconnect built * in dipoie antenna and connect gen erator to dipole terminals with resistor 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 v

18、oltmeter Is to be 77 % connected between chassis ground and the AVC line. strip A signal of .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-2

19、5 Deflection -i Open Maximum Maximum Deflection 27 K ohm resistor (R-10) and its junction 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