General-Electric-Co-P806 电路原理图.pdf

《General-Electric-Co-P806 电路原理图.pdf》由会员分享，可在线阅读，更多相关《General-Electric-Co-P806 电路原理图.pdf（1页珍藏版）》请在收音机爱好者资料库上搜索。

1、wpffmpi VOLUME R-19, MOST-OFTEN-NEEDED 1959 RADIO SERVICING INFORMATION GENERAL UH ELECTRIC Models P755A, P805, and P806 TRANSISTOR CHART TR4 TR5 2N192 2N241A 2N324 2N270 2N406 2N321 2N408 TR1* TR2 TR3 TR4 TR5 2N194A 2N135 2N169 2N192 2N241A 2N212 2N233A 2N324 2N270 (1297) 2N293 2N406 2N321 _I 2N314

2、 | 2N408 *When TR1 is 2N169, resistor R1 is 82K. When 2N212(1297) is used, R1 is 33K. TO REMOVE CIRCUIT BOARD 1. Remove screw from the cabinet back. 2. Insert a ooin in either slot on the cabinet bottom and twist to remove the cabinet back. 3. Remove screw holding tuning dial. 4. Remove 3 screws und

3、er tuning dial to release tuning gang from cabinet front. 5. Remove 3 hexhead screws and one 11/32 nut(bottom center of circuit board) holding circuit board to bosses on cabinet front. 6. Fold tuning gang and circuit board out of cabinet front toward the volume control end. It is not necessary to re

4、move volume control to repair the circuit board. TO REMOVE VOLUME CONTROL 1. Remove cabinet back. 2. Remove hex head screw from center of volume control knob. 3. Remove chassis. 4. Remove pal nut holding volume control to cabinet front boss. TO REMOVE SPEAKER 1. Remove cabinet back. 2. Remove chassi

5、s. 3. Unsolder speaker wires. 4. Remove clips holding speaker to cabinet front. TROUBLE SHOOTING A check of battery current drain will indicate if a receiver is operating properly. To measure the current drain, remove cabinet back, unsnap ground section of battery terminal and swing away from batter

6、y. Connect milliammeter between battery terminal and battery contact. The total current drain should be between 19.0 and 24.0 ma. The current drain is measured with no signal-conditions (tuning gang closed) and volume control at maximum. If an excessive current drain is recorded, the individual collector current readings should be checked on each transistor. Current drain is an important indication of the transistor operating conditions. ,_, 5C#- * 1 I * * J 5 * I INI -1 U3 mhlt 8881*55 5*58 O O s s 3 Sis* 5 8*? m “s! o* “? = * _iqo.u uu ink I 3 u * a-laiN - sSs * 53 收音机爱 好者资料库 RadioFans.CN