MC78T12 3Amp regulator - do I need it, where to buy?
I have an English Mark Darts (Series 6300) with a non-working monitor.
I was told it was working and simply quit.
OK... I measured the 12vdc in at the monitor (it's the Orion monitor) and got no voltage reading.
I moved back to the power supply output and read all the voltages out.
The only output that is missing is the 12vdc to the monitor.
Looking at the schematics, it would seem like the only possible failure point would be the voltage regulator 'U2'
I noted that it is very, very hot to the touch (while U3 for example is not).
The game itself, when hooked up to an external display, plays fine.
So, here are my questions...
1. Is my troubleshooting conclusion ... well... conclusive?
2. If not, how can I check this transistor to determine if it failed?
3. If so, where can I get a replacement or alternative part (google was not much help)?
I have an English Mark Darts (Series 6300) with a non-working monitor.
I was told it was working and simply quit.
OK... I measured the 12vdc in at the monitor (it's the Orion monitor) and got no voltage reading.
I moved back to the power supply output and read all the voltages out.
The only output that is missing is the 12vdc to the monitor.
Looking at the schematics, it would seem like the only possible failure point would be the voltage regulator 'U2'
I noted that it is very, very hot to the touch (while U3 for example is not).
The game itself, when hooked up to an external display, plays fine.
So, here are my questions...
1. Is my troubleshooting conclusion ... well... conclusive?
2. If not, how can I check this transistor to determine if it failed?
3. If so, where can I get a replacement or alternative part (google was not much help)?
