Western-Auto-Supply-Co-D-1747 电路原理图.pdf

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1、收音机爱 好者资料库 RadioFans.CN MANUAL OF 1948 MOST-OFTEN-NEEDED RADIO DIAGRAMS WESTERN AUTO SUPPLY COMPANY MODELS D1747 set the volume control at maximum; connect the ground post of the signal generator to the radio chassis; connect the output meter across a 3.2-ohm output load; and allow the re ceiver and

2、 signal generator to warm up for several minutes. Align the set according to the sequence given in the chart. The indicated dummy antenna is to be connected in series be tween the signal generator output lead and the receiver. Adjust the set for maximum output; reduce the input as needed to keep the

3、 output near 1.3 volts. Locations of all trimmers and coils are shown elsewhere in this manual. After adjustment, seal the coil cores with col lodion or a similar substance (do not use cement). BAND SWITCH SETTING Broadcast (for I. F.) Broadcast 31 Meter SIGNAL GENERATOR dial Coupling ,. POINTER Fre

4、quency Capacitor Connection to Radio SETTING 1600 kc 200 mmf 1400 kc 200 mmf 9.6 me 400 ohms Grid (pin 8) of converter (6SA7) Antenna lead Antenna lead Antenna lead 1600 kc Meter 11-8 me 400 ohms 19 Meter 15.2 me 400 ohms Antenna lead Antenna lead ADJUST TO MAXIMUM OUTPUT (in order shown) Trimmers o

5、n output and input I. F. cans BC Osc. trimmer 05 BC R. F. trimmer C8 BC Ant. trimmer C2 Rotate cores of BC R. F. coil T7 and BC Ant, coil Tl 9 me Osc. trimmer 04 9 me R. F. trimmer C9 9 me Ant. trimmer C3 12 me Osc. coil T13 12 me. R. F. coil T8 12 me. Ant. coil T2 15 me. Osc. coil T12 15 me R. F. c

6、oil T9 15 me Ant. coil T3 a la. OUTPUT I.F. f (TRIMMERS ON TOP) BC RF / BC OSC- 12MC RF SMC RF- / CMCRF / LlSMC RF / 12MC Atslt-r l ISMC ANT J 178 Coifs and Trimmers (s) PLACE POINTER CARRIAGE AS FAR AS It WILL GO TO THE LEFT. THEN WRAP STRING s*eWTon L pullet STRING THRUisL 3 TURNS TURN TO EXTREME

7、SET SCR, COUNTER-CLOCKWISE POSITION -TUN|N0 SH*FT WHEN FINISHED WITH STRINGING, SPRING MUST BE J FROM IDLER AS SHOWN. TO DO THIS: LOOSEN SET SCREW DN PULLEY. (5) HDLD TUNING SHAFT FIRM IN POSITION INDICATED AND TURN PULLEY BY HAND UNTIL SPRING IS i AWAY FROM IDLER. (6) TIGHTEN SET SCREW. NOW SPRING

8、SHOULD TRAVEL BACK AND FORTH WITHOUT TOUCHING THE IDLERS. (7) REPLACE CHASSIS IN CABINET. REPLACE POINTER ON CARRIAGE. TUNE IN STATION OF KNOWN FREQUENCY. HOLD TUNING SHAFT FIRM AND SLIDE POINTER TO CORRECT POSITION ALDNG DIAL. GLUE POINTER TO STRING. Replacement of Drive Cord 收音机爱 好者资料库 RadioFans.CN 收音机爱 好者资料库 RadioFans.CN