Montgomery-Ward-and-Co-05WG-2748 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&sh 2500 mmf 6BA6

9、1st l-F 2500 mmf Pin 1 and Chassis 6BA6 1st l-F 2500 mmf Pin 1 and Chossis BAND SWITCH SETTING FM GANG CONDENSER SETTING Rotor Fully Open Rotor Fully Open Rotor Fully Open Disc. Pri. (5) Note A Disc. Sec. (6) Note B Moximum Deflection 2nd l-F Pri. (7) Sec. (8) Note D Junction C-32A & B (Duol 100 mmf

10、 cond.) And chossis Rotor Fully Open Rotor Fully Open Same as obove Rotor Fully Open Disc. Pri. (5) _Note D 1st l-F Pri. (9) & Sec. (10) 2nd l-F Pri. (7) & Sec. (8) Disc. Pri. (5) In Order Shown Note D ! Disc. Sec. (6) Note B Moximum Deflection Maximum Deflection Maximum Deflection Maximum Deflectio

11、n RECHECK l-F ADJUSTMENTS IN ORDER GIVEN Disconnect built-in dipole on- 300 ohms FM tenna and connect generator to dipole terminols with re sistor in_ series._ Some as above 300 chms FM f! Rotor Fully Open Maximum Deflection ” J me aCOVe 300 ohm. FM Tune rator for Ant. C-39 Moximum - -I-_mox A VC vo

12、ltage_Deflection RECHECK ANTENNA & OSC. ADJUSTMENTS In ORDER GIVEN FM ALIGNMENT NOTES NOTE BDisconnect zero center DC vacuum tube voltmeter from NOTE AThe zero center scale DC vacuum tube voltmeter is to be *VC ont* connect at the audio takeoff point at the connected between chassis ground and the A

13、VC line. 27 K ohm resistor (R-10) ond its junction with the terminal signol ot .1 volt must be fed into the receiver for strip. Adjust for zero voltage indication. A signol of .1 volt must be fed into the receiver for this adjustment. Note output voltage on the zero center DC vocuum tube voltmeter NOTE CAM l-F coils must be oligned before attempting to align the FM l-F coils. 64 NOTE DConnect zero center DC vacuum tube voltmeter os in Note A. Adjust input to give some output on the zero center DC vocuum tube voltmeter as in Note A. x 收音机爱 好者资料库 RadioFans.CN