Epicardial Mapping Equipment Controller PCB Card Repairing can work on below aspects which include:
1, Interface IC chipset,
2, Buffers;
3, Latch;
4, Memory;
5, Counter;
The interface IC chipset is a bridge between each controlling circuit board and the epicardial mapping equipment motherboard. Any information transmitted by the epicardial mapping instrument motherboard to the controlling PCB board is first sent to the board for processing through the interface circuit, and the processed information in the board must also be sent to the host or sent through the interface circuit. To the terminal where the task is performed.
Therefore, as long as there is an abnormality (such as harmful pulses of various power grids, lightning and spark interference), whether it is the host or the terminal performing the task, the first threat is interface circuits, which are relatively more likely to be damaged. Common interface circuit IC devices are: MAX232, 75188 (1488), 75189 (1489), 9636, 9637, 9638, 9639, 8641, 5812, 5824, and so on.
So first use the online tester to test the mainboard and interface device. If you can confirm that there is no problem with the interface circuit, you can inject the corresponding test signal from the interface circuit to track and find it.
If there is no schematic drawing data of the broken printed circuit board, then the corresponding signal can’t be injected into the interface circuit, which is a problem often encountered in IC pcb board maintenance. Therefore, an online tester should be used to further test the buffer, the gate circuit between the buffer and the interface circuit, and the connected latch circuit. The commonly used buffer circuits are: 74240, 74241, 74244, 74245, etc, commonly used latches device circuits are: 74373, 74375, etc.
