Some boards won't boot up normally if a Test or Halt DIP Switch is enabled.Ģ) Identify the malfunctioning subsystem. Some boards need a DIP switch selected to enable Test Mode. Some boards need a little more juice than 5.0V to run, but don't exceed 5.15V if you can help it. A decent entry-level EPROM programmer costs $200.Įventually, you'll also want soldering and desoldering tools - you'll need them to remove faulty components from the board to replace them.ĭecent entry-level soldering tools start at about $150.ġ) Make sure all DIP switches are set to OFF, and that the supply voltage is between 5.0V and 5.15V. I made a tutorial video on using a logic probe to test an EPROM here:Įventually, you'll want to have an EPROM programmer - it lets you dump ROMs, program new EPROMs, test logic chips, and test RAM chips. A decent starting logic probe can be obtained for around $20 from Amazon. You'll want to have a logic probe - it lets you see the logic activity for each line on each chip. A decent starting multimeter can be obtained for around $20 from Amazon. Use it to test for voltage levels on chips and for continuity on traces. I don't know what your current knowledge level of electronics troubleshooting is, so I'll try to explain things as thoroughly as I can without getting too far into the weeds.Īt a minimum, you'll want a digital multimeter. Here's the rundown on my process when troubleshooting a board. I ended up writing a short essay, and we both agreed that the info may be useful for others so here it is: As part of troubleshooting his Gradius II PCB, asked me through PM for a summary of my diagnostic procedure when looking at a board.
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