- Joined
- Dec 9, 2006
- Posts
- 2,386
I figure this would help people fix their MV-1C boards whose only problem is that a button(s) is permanently stuck on the ON position. The old way of fixing this is to just replace the entire YSA2 chip but that isn't exactly my idea of a good time.
With this method, all you need is a 74HCT245 or 74HCT244 to repair the input. Just lift the corresponding pin on the YSA2 that has the busted input and connect the pad to the input on the bus transceiver. The entirety of the chip doesn't need to be connected but at minimum, you'll need to get 5 wires if you only have one busted input (VCC, GND, /G, 1 input, 1 output).
With this method, all you need is a 74HCT245 or 74HCT244 to repair the input. Just lift the corresponding pin on the YSA2 that has the busted input and connect the pad to the input on the bus transceiver. The entirety of the chip doesn't need to be connected but at minimum, you'll need to get 5 wires if you only have one busted input (VCC, GND, /G, 1 input, 1 output).