General Category > Lisa Troubleshooting and Repair
Lisa Video, ProFile power issue, NiCad Leak fixes, etc.
rayarachelian:
--- Quote from: D.Finni on June 02, 2021, 07:55:24 pm ---
Sure, but first you'll have to finish writing the emulator and fix all of its bugs. :P :P
*ducks and runs*
--- End quote ---
It is open source, you can submit patches via pull reuqests. :)
AlexTheCat123:
The EPROM finally finished programming after around 12 hours or so, but the problem with MA8 is exactly the same with the new chip. I guess it's just a matter of waiting for the 6504 to arrive from China now. The good news is that I just got a broken 5MB ProFile in the mail that I can try to fix in the meantime. The power supply is dead, so I'll try to test the rest of the electronics with an ATX power supply just to see if it works at all.
rayarachelian:
--- Quote from: AlexTheCat123 on June 03, 2021, 08:43:19 am ---The EPROM finally finished programming after around 12 hours or so, but the problem with MA8 is exactly the same with the new chip. I guess it's just a matter of waiting for the 6504 to arrive from China now. The good news is that I just got a broken 5MB ProFile in the mail that I can try to fix in the meantime. The power supply is dead, so I'll try to test the rest of the electronics with an ATX power supply just to see if it works at all.
--- End quote ---
Actually that might be a good hack - if you could take photos of the ATX power supply and connection to the ProFile board, etc. could make a good HOWTO/Wiki article "Replace ProFile Power Supply with ATX PS", etc.
AlexTheCat123:
--- Quote ---Actually that might be a good hack - if you could take photos of the ATX power supply and connection to the ProFile board, etc. could make a good HOWTO/Wiki article "Replace ProFile Power Supply with ATX PS", etc.
--- End quote ---
That's a good idea! I can take some pictures once I get everything fully connected and working. I gave the controller board the 5V and 12V that it needs from one of my ATX PSUs and tried powering it up without the hard drive connected (the drive has some problems). There's processor activity and after around 20 seconds the Ready light blinks three times, then pauses, and blinks another two times. I'm assuming this is some sort of error code related to the disk not being connected, but I couldn't find any documentation anywhere to support this.
The hard drive itself seems to have trouble spinning up. I tried spinning the motor on the bottom of the drive manually to free it up and now it at least tries to spin, but it goes really slow and the TIP120 transistors that drive the motor get very hot. Thinking that maybe the grease in the motor is just dried up, I used a hair dryer to heat up the motor and after a few minutes of the hair dryer it spun up just fine, although it was a good bit slower to get up to speed than the ProFiles that I've seen on YouTube. I was goint to let it run upside down overnight to redistribute the grease inside the motor, but then I discovered that as the motor cooled off again and the effects of the hair dryer wore off, the drive would slow down and eventually stop. One of the driver transistors popped when this happened, but I fortunately have some replacement TIP120s. Now I'm scared to try again without somehow lubricating the motor in fear that another transistor will blow. Does anyone know how to solve a problem like this? Is there a way that I can lubricate the motor?
rayarachelian:
--- Quote from: AlexTheCat123 on June 03, 2021, 12:26:45 pm ---The hard drive itself seems to have trouble spinning up. I tried spinning the motor on the bottom of the drive manually to free it up and now it at least tries to spin, but it goes really slow and the TIP120 transistors that drive the motor get very hot. Thinking that maybe the grease in the motor is just dried up, I used a hair dryer to heat up the motor and after a few minutes of the hair dryer it spun up just fine, although it was a good bit slower to get up to speed than the ProFiles that I've seen on YouTube. I was goint to let it run upside down overnight to redistribute the grease inside the motor, but then I discovered that as the motor cooled off again and the effects of the hair dryer wore off, the drive would slow down and eventually stop. One of the driver transistors popped when this happened, but I fortunately have some replacement TIP120s. Now I'm scared to try again without somehow lubricating the motor in fear that another transistor will blow. Does anyone know how to solve a problem like this? Is there a way that I can lubricate the motor?
--- End quote ---
Sadly I've not had to do this with ProFiles, just a couple of Widgets which did start spinning up properly after that. I don't know if you'd need to open it up to lubricate it or not, or you might have to open up just the motor, not sure.
* http://www.minuszerodegrees.net/manuals/Seagate/Seagate%20ST506%20-%20Service%20Manual%20-%20May82.pdf might help?
* https://stardot.org.uk/forums/viewtopic.php?t=6954
* https://www.vcfed.org/forum/forum/genres/pcs-and-clones/29157-st-225-longevity?p=361534#post361534
The ST225 one mentions using a single drop of 3-in-1 oil, maybe that would work for the ST506?
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