debaser138
Well-known member
I'm working on a Robotron that was running fine until about 2 weeks ago. It shows the initial rug pattern and then goes to a static screen of red horizontal lines. If you watch the ROM board, it displays 1 2 7 twice and then just repeats 1 3 1. I've tried swapping both of those RAM locations with other RAMs but it doesn't change anything. I also pulled out the CPU board and removed/reflowed the solder on the header pins for the three connections on the top of the board as a few of them were bad.
Measuring the voltage right at the 4116 RAM, I'm getting +4.96v, -5.07v and +11.94v. The machine currently has a Dell computer power supply in it and I can't adjust the +5. I'm going to replace that Dell power supply at some point as I'm not a fan of using computer power supplies. I also want to rewire it so I can easily swap in another switcher in the future.
I've ordered the 4164 RAM replacement kit which will be here by the weekend. Not sure if this will fix the problem but since the machine will be running 16 hours a day, it's good preventive maintenance regardless.
Any suggestions on what else I should look for? Thanks.
Measuring the voltage right at the 4116 RAM, I'm getting +4.96v, -5.07v and +11.94v. The machine currently has a Dell computer power supply in it and I can't adjust the +5. I'm going to replace that Dell power supply at some point as I'm not a fan of using computer power supplies. I also want to rewire it so I can easily swap in another switcher in the future.
I've ordered the 4164 RAM replacement kit which will be here by the weekend. Not sure if this will fix the problem but since the machine will be running 16 hours a day, it's good preventive maintenance regardless.
Any suggestions on what else I should look for? Thanks.

