A while back I got my hands on a Tek 4051 in pretty decent cosmetic shape. It came with ROM expander and a few roms.
Of course, it didn't work
After some debugging, the following issues where found and fixed:
One transformer tap was not connected. This turned out to be the wire on top of the transformer going to the solder tap, so this was a mostly easy fix.
The on/off switched had died.
A 47 ohm resistor, R339, on the display board was burned out. I measured all parts after this and did not see anything obviously wrong so replaced the resistor.
After that I got image, some calibrating later and some cleaning later, I now have a working Tek 4051
Some keyboard switches are a little crusty, but apart from that it all appears to be working as expected.
Now I was wondering, is there anything to check or keep in mind on these devices, common errors for example, or specific parts that often fail and can be wise to replace before they do?
I did find this service note, describing the issue with R339/R64/Q165 and I ordered parts to perform the recommended modification: https://github.com/mmcgraw74/Tektro..._ServiceNotes/4051 4052 Display board mod.pdf
And what would be a good way to get files/data on this machine? Sadly I don't have the communications pack, so no serial port to work with. I did find the gpib flash drive and plan to build one of those at least!
Regards,
Rik
Of course, it didn't work
After some debugging, the following issues where found and fixed:
One transformer tap was not connected. This turned out to be the wire on top of the transformer going to the solder tap, so this was a mostly easy fix.
The on/off switched had died.
A 47 ohm resistor, R339, on the display board was burned out. I measured all parts after this and did not see anything obviously wrong so replaced the resistor.
After that I got image, some calibrating later and some cleaning later, I now have a working Tek 4051
Some keyboard switches are a little crusty, but apart from that it all appears to be working as expected.
Now I was wondering, is there anything to check or keep in mind on these devices, common errors for example, or specific parts that often fail and can be wise to replace before they do?
I did find this service note, describing the issue with R339/R64/Q165 and I ordered parts to perform the recommended modification: https://github.com/mmcgraw74/Tektro..._ServiceNotes/4051 4052 Display board mod.pdf
And what would be a good way to get files/data on this machine? Sadly I don't have the communications pack, so no serial port to work with. I did find the gpib flash drive and plan to build one of those at least!
Regards,
Rik
