General-Electric-Co-P925A 电路原理图.pdf

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1、TABLE OF VOLTAGES E B C TRI 0.7 0.8 4 5 TR2 1 1 1 3 4.5 IM-I PIN 1 Pin 2 PlN 4 PlN 5 0 08 0 o.ia 4.7 AM-4 PIN | Pin 3 PIN 4 PikS o.oe 40 02 0 18 PIN 6 PIN 7 P|N 8 PlN 9 3.0 3 1 3 1 6.0 pin iO PIN I PIN|2 P|N 13 0 4.7 018 0.08 MOST-OFTEN-NEEDED 1964 RADIO SERVICING INFORMATION RADIO MODEL P925A GENER

2、AL mm ELECTRIC STEP SICNAL GEN. INPUT BAND SWITCH TUNINC GANG AM GEN. SWEEP CEN. ADJUST THE FOLLOW INC: CONMECT VTVM ACROSS CONNECT SCOPE ACROSS REMARKS I Inductively Couple to AM (LI01) P BC Op 455KC T2,T1 of IF Module (IM-1 T2 sir Voice Coll 2 High Bide to Ex ternal SW Ant. Low side to Ex ternal G

3、round terminal. 12MC I2MC C2C fot Maximum Amplitude Voice Coil Voice Coil Adjuat Signal Generator to 910 KC above wanted frequency to obeerve image frequency reiponee. 3 High side to Ex ternal SW Ant. Low side to Ex ternal Ground SW 4MC 4MC L2 for Maxim ten Amplitude Coll Voice Coil Adjust Signal Ge

4、nerator to 910 KC above wanted frequency to obeerve image frequency response, | 4 Repeat steps 1 and 2 until no further adjustment Is required. 5 High side to Ex ternal SW Ant. Low side to Ex- terminal . SW 12MC L2MC * 12MC C2B for Max limm Amplitude Voice J2oil *Across pin i of IF Module (IM-1) Gro

5、und *Adjust Sweep width con trol or center frequency sponse. 6 High side to Ex ternal SW Ant. Low side to Ex ternal Ground terminal. SW 4MC T1 for Maxijmm Amplitude Voice Coil pin 1 of IF Module (IM-L) Ground Adjust Sweep width con trol or center frequency to observe Ijnage re sponse . | 7 Repeat st

6、eps 4 and 5 until no further adjustment is required. a Inductively Couple to AM Antenne Loop BC Open 1630 KC C2D for Max irmsr, Amplitude Coil Voice Coil Inductively Couple to AM Antenne Loop BC 1400 KC 1400 KC *1400 KC Maxijmm Amplitude Voice Coil of IF ModuLe (IM-l) Ground Rock Gang during Peak Al

7、ignment 10 Inductively Couple to AM Antenna Loop BC 580 KC 580 KC *580 KC LI for Maxijmm Amplitude Voice Coil pin I of IF Module IM-1) Ground Rock Gang during Peak Alignment |ll Repeat step* 7, 8 and 9 until no further adjustment la required. IP MOOULE I M -I) I. UNLESS OTHERWISE NOTED CAPACITORS lO

8、RE THAN |*MMF OR PF caPacitors LESS THAN l*MF RESISTORS ARE 1/2 WATT K*IOOO 2 VOLTAGES ARE NEGATIVE WITH RESPECT TO GROUND UNDER NO SIGNAL CONDITIONS AND VOLUME CONTROL MIN. 3 REPLACE TRANSISTORS WITH TYPES SHOWN BY CATALOG NO LISTED IN PARTS LIST 4. SI SHOWN IN BROADCAST POSITION SIA SIB BANDSWITCH VIEWED FROM COMPONENT SIDE OF BOARD * SWEEP ALIGNMENT ONLY 50 收音机爱 好者资料库 RadioFans.CN