Maintenance circuit diagram of microprocessor partial failure

Published:2011/6/24 2:58:00 Author:Ecco | Keyword: Maintenance circuit , microprocessor, partial failure | From:SeekIC

Figure 1 is a schematic diagram of the machine, when you press the playback button PLAY (SW503), pin {18} the address signal of IC501 (μPD7538C) is the high start pulse signal by sent to pin 9 after passing the R568, SW503, D511. The internal circuit of microprocessor will generate IC501 playback control commands, so that pin {16} high will output 4  9V high level, of which one way is sent to the pin 4 of CN204 to drive the drum motor, and another way is sent to pin 2 and pin 5 of IC502. The dominant axis motor of IC501 is positive rolling , the pin {34} of control commands output end is also in high level, which is added to pin 5 of CN204 by IC506 to drive the capstan motor be positive rolling.



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