BBK-AV217-av-sch 电路图 维修手册.pdf

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1、6.2 Channel and MIC Delay Selection The delay circuit is made up of the D triggers N908A, N908B and voltage comparers N910B, N910C, N911A. The inching switch S905 is the channel selection button in the front panel. S906 is the MIC delay selection button. D, R and S are the controllers. Its low level

2、 when R is grounded. CLK is the triggering port whose output mode overturns when a high level comes. When A+25V passes through R980 and R991, the inphase opposition voltage of those four voltage comparers is divided into about +1.6V. The working modes are as follows. (Figure 8) Input PortOutput Port

3、 The Real Value Table of the D Trigger CLK / / D / 0 1 0 R 0 0 0 0 S 1 0 0 0 Q 1 1 0 1 O 0 0 1 0 Figure 8 1 2 3 A B Ex XP3 VD916 R990 V-5CH - 9 - 18 - 8.1.2 Schematic Diagram Of The Main Power Amplifying Board V424 C9014 V405 2N5551 V423 C9014 V407 2N5551 V409 D718 V426 C9014 V421 C9014 V427 C9014 V

4、404 2N5401 V410 B688 V408 2N5401 R401 220 R452 220/3W R451 220/3W R438 2.7k R408 680 R406 1k R416 0.25/3W R415 0.25/3W R414 220 R453 3k3 R403 4k7 R402 22k C401 10u/16V C405 33 C402 271 R417 220 R418 22k C406 10u/16V C407 271 R433 3.9k R435 2.7k R439 10/2W R434 3.9k R447 1M C413 104 12 34 56 Y401 DC

5、24V VD405 1N4148 VD406 1N4148 VD407 1N4004 R461 47k R444 10k R445 10k R450 47/3W R462 47k C416 220u/25V C415 220u/25V VD408 1N4004 C418 100u/35V C422 6800u/35V C425 47u/16V C423 470u/25V C426 47u/16V C424 470u/25V C421 6800u/35V C431 102 CD R VCD L DVD R VCD R DVD L TAPER TAPEL CD L C L SL SR R FL40

6、2 T6.3A/250V FL401 T6.3A/250V X0 12 X1 14 X2 15 X3 11 Y0 1 Y1 5 Y2 2 Y3 4 INH 6 A 10 B 9 VEE 7 X 13 Y 3 168 N401 CD4052 C430 47u/16V R456 1k VD416 6.8V VD417 6.8V R455 1k C429 47u/16V -12V +12V +33V -33V R413 22k +33V -33V V425 C9015 C411 1u/16V L 1 R 1 A B Ex C403 47u/25V C417 10u/50V To VFD Board

7、To VFD Board From Trans 1 2 3 XS3 3PIN C420 224 C419 224 R446 10k 1 2 3 XS4 3PIN VD402 1N4148 VD401 1N4148 R409 150 V422 C9014 R436 3.9k R440 10/2W R437 3.9k C414 104 +33V -33V C412 1u/16V V429 2N5401 V428 2N5551 VD415 12V VD414 12V R454 3k3 C427 100u/16V C428 100u/16V +12V -12V R457 1k R458 1k C432

8、 102 C435 10u/50V C436 10u/50V C437 10u/50V C438 10u/50V V401 2N5551 V402 2N5551 R405 10k V403 2N5551 R407 22k R404 4k7 V406 C9014 R411 3k R412 1.2k C404 33 R410 150 V415 2N5551 V417 2N5551 V419 D718 V414 2N5401 V420 B688 V418 2N5401 R424 680 R422 1k R432 0.25/3W R431 0.25/3W R430 220 R419 4k7 C410

9、33 R429 22k C408 47u/25V VD404 1N4148 VD403 1N4148 R425 150 V412 2N5551 R421 10k V413 2N5551 R423 22k R420 4k7 V416 C9014 R427 3k R428 1.2k C409 33 R426 150 V411 2N5551 R443 1k VD410 1N5404 VD411 1N5404 VD412 1N5404 VD413 1N5404 V430 2N5551 V431 2N5401 V432 2N5551 V433 2N5401 C433 10p C434 10p R459

10、220 R460 220 R463 220 R464 220 C439 47u/35V C440 47u/35V C441 47u/35V C442 47u/35V REC R REC L C443 10u/16V C444 10u/16V R466 47K R465 47K R4 L4 1 2 3 4 5 6 XS5 6PIN R4 L4 +12V -12V 25V 0 25V VD409 12V R44810k VD418 1N4148 V434 C9014 V435 C9014 12 34 56 Y402DC 24V R441 10k R442 10k VD419 1N4004 R467 1k R468 1k R469 1k R470 1k R471 1k R472 1k R473 1k R474 1k RadioFans.CN 收音机爱 好者资料库