Sylvania-Electric-Products-SC26 电路原理图.pdf

《Sylvania-Electric-Products-SC26 电路原理图.pdf》由会员分享，可在线阅读，更多相关《Sylvania-Electric-Products-SC26 电路原理图.pdf（3页珍藏版）》请在收音机爱好者资料库上搜索。

1、VOLUME R-24. MOST-OFTEN-NEEDED 1964 RADIO SERVICING INFORMATION SYLVANLA Chassis 702-2, Models SC26 Series Wl tijf: hist Alignment and other service data on the next two pages. 6*T Q3 01 mf t i r- * -W jfl rWvt, | 1 G3Z5 M i la .vl CftWg lj lr .ss o Voltages shown are measured to chassis no signal,

2、without brackets with switch in AM position, with brackets for PM. -vr* P -issr %izxytx pw 153 BOTTOM PARTS LAYOUT 收音机爱 好者资料库 RadioFans.CN VOLUME R-24, MOST-OFTEN-NEEDED 1964 RADIO SERVICING INFORMATION SYLVANIA Chassis 702-2, Models SC26 Series, Alignment Information,Continued (Alignment continued

3、on the next page, other data preceding and following) -AM ALIGNMENT- (Selector switch m AM position) STEP TUNING CAPACITOR SETTING TEST EOUIPMENT HOOK-UP GENERATOR FREQUENCY ADJUSTMENT POINT ADJUST FOR Fully Open SIGNAL GENERATOR - Hot lead thru a .1 Mfd Capacitor to test point Ground lead to chassi

4、s* AC VOLTMETER - Across Speaker terminals of channel set at maximum volume. 455 KC |T5 Bottom nD Top |T4 Bottom TT| Top Maximum Meter Reading 2 Fully Open Same as Step 1 1620 KC |C29D | AM Osc. Trimme r Maximum Meter Read ing 3 1400 SIGNAL GENERATOR - Radiate signal to receiver through a lobp consi

5、sting of several turns of wire. AC VOLTMETER - Same as Step 1. Set generator to a fre quency corresponding to receiver dial (until sig nal is heard through re ceiver speake r. ) | C29B | AM Ant. T rimmer Maximum Meter Reading -FM ALIGNMENT.- (Selector switch in FM position) STEP TUNING CAPACITOR SET

6、TING TEST EOUIPMENT HOOK-UP GENERATOR FREQUENCY ADJUSTMENT POINT ADJUST FOR Point of non-inter- fe r ence SIGNAL GENERATOR - Hot lead through a .005 Mfd capacitor to test point * Ground lead to chassis* AC VOLTMETER - Hot lead to test point C * Ground lead t o chas sis 10. 7 MC _T3j Bottom 1 T21 Bot

7、tom HT1 Top HT1 Top fL5l Ma ximum Meter Read ing 2 Same as Step 1 SIGNAL GENERATOR Same as Step 1. AC VOLTMETER - Hot lead to test point . Ground lead connected to chassis* 10. 7 MC 1 T3 | Top Zero Meter Reading 3 108 , SIGNAL GENERATOR - Same as Step 1. AC VOLTMETER - Same as Step 1. 108 MC 1C2D1 F

8、M Osc. Trimmer Maximum Meter Reading 154 收音机爱 好者资料库 RadioFans.CN VOLUME R-24, MOST-OFTEN-NEEDED 1964 RADIO SERVICING INFORMATION SYLVA.NIA Chassis 702-2, Models SC26 Series, Alignment Information, Continued -FM ALIGNMENT (Continued )- SIGNAL GENERATOR - Same as Step 1. AC VOLTMETER - Same as Step 1.

9、 MULTIPLEX ALIGNMENT PROCEDURE Outlined below is an alternate method of by the equipment manufacturer. Peaking of FM MULTIPLEX ALIGNMENT using a standard the 19KC and 38KC coils is easily accomp- Multiplex Broadcast as the signal source. lished, however correct phase relationship Whenever FM multipl

10、ex alignment equipment is absolutely essential for maximum chan- is used, follow the procedures specified nel separation. (Selector switch in FM multiplex position) ADJUSTMENT TEST EQUIPMENT HOOK-UP OSCILLOSCOPE - Hot lead to pin 6 Multiplex of 19EA8* Ground lead to chassis* OSCILLOSCOPE - Hot lead

11、to pin 1 of 6C4* Ground lead to chassis Remove test equipment Max output of the 19 KC pilot carrier Max output of the 38 KC signal Very carefully readjust cm a nd PFT| for maximum separation of sound. NOTE: Some multiplex stations transmit announcements on one channel only. Adjust | T 6 or nn for minimum output on opposite channel being transmitted. R34 VOLUME 50C5 I2AX7 V7 *5dRK R2s| cezCI I2BE8 50C5 Qfre uT(0VC64 VI E OH o I2DT8 m v3 I9EA8 I2AL5 O I2AU6 O I2BA6 O 收音机爱 好者资料库 RadioFans.CN