Icky Projects
Re: Icky Projects
Nice to hear the SEC runs fine with the others
If it ain't broke, test it to Destruction.
Re: Icky Projects
TT PSU Recap
Well I got my hands on another TT and wanted really to give it a service, update it and then offer it up for a good home once completed.
My first job is to recap the PSU and thought I would also document to see if there were any differences based on discussions around the A1 and A2 boards on this thread - https://www.exxosforum.co.uk/forum/viewt ... psu#p39560
First observation the PSU has an odd fan controller stuck on the side. Now to crack open the PSU and see what version is inside. For reference the TT is an early version with the 68030 daughter board. Need to check the exact revision using @Atarian Computing revision guide - https://www.exxosforum.co.uk/forum/viewt ... 1025#p7684
Well I got my hands on another TT and wanted really to give it a service, update it and then offer it up for a good home once completed.
My first job is to recap the PSU and thought I would also document to see if there were any differences based on discussions around the A1 and A2 boards on this thread - https://www.exxosforum.co.uk/forum/viewt ... psu#p39560
First observation the PSU has an odd fan controller stuck on the side. Now to crack open the PSU and see what version is inside. For reference the TT is an early version with the 68030 daughter board. Need to check the exact revision using @Atarian Computing revision guide - https://www.exxosforum.co.uk/forum/viewt ... 1025#p7684
Re: Icky Projects
Somehow, the fan controller doesn't exactly look "factory original" to me. Maybe the previous owner found the fan to be too loud and installed something to drop/regulate the voltage?
BTW: After this discussion I think the TT's PSU needs to always have a reasonable airflow.
BTW: After this discussion I think the TT's PSU needs to always have a reasonable airflow.
Re: Icky Projects
Well the fan board turned out to be plugged into the fan connector with a thermistor wrapped to the inside of the case.
The PSU is a REV O2 with the PC111. @mikro you may be interested as its different rev to our A1 and A2's the O looks like an O as opposed to a zero if you compare the text to the line above.
The PSU is a REV O2 with the PC111. @mikro you may be interested as its different rev to our A1 and A2's the O looks like an O as opposed to a zero if you compare the text to the line above.
Re: Icky Projects
With all the boards we are making smaller and cramming as much as we can into footprints we are finding that the JTAG is starting to dominate and be a rather large part of the board. This is space that can be used elsewhere including all the peripheral pull-up / pull-down resistors around the JTAG.
@exxos and I have been discussing a small micro JTAG adaptor board that allows us to remove these bulky components and have a small 2.0mm plug / socket to connect to our boards enabling us to update firmware.
@exxos and I have been discussing a small micro JTAG adaptor board that allows us to remove these bulky components and have a small 2.0mm plug / socket to connect to our boards enabling us to update firmware.
Re: Icky Projects
https://www.exxosforum.co.uk/atari/ All my hardware guides - mods - games - STOS
https://www.exxosforum.co.uk/atari/store2/ - All my hardware mods for sale - Please help support by making a purchase.
viewtopic.php?f=17&t=1585 Have you done the Mandatory Fixes ?
Just because a lot of people agree on something, doesn't make it a fact. ~exxos ~
People should find solutions to problems, not find problems with solutions.
https://www.exxosforum.co.uk/atari/store2/ - All my hardware mods for sale - Please help support by making a purchase.
viewtopic.php?f=17&t=1585 Have you done the Mandatory Fixes ?
Just because a lot of people agree on something, doesn't make it a fact. ~exxos ~
People should find solutions to problems, not find problems with solutions.
Re: Icky Projects
Continuing with the TT PSU work. Have just braided the floppy and HDD power wires. Now onto the re-capping.
Re: Icky Projects
Just checking out the voltages prior to the recap. It always makes me smile and have a bit of nostalgia when using those resistors.
The CGS Resistance Co. Ltd in Lymington who produced the one on the right was a child company of the electronics firm I worked at in the late 90's.
The CGS Resistance Co. Ltd in Lymington who produced the one on the right was a child company of the electronics firm I worked at in the late 90's.
Re: Icky Projects
I forgot to mention anyone re-capping a MegaSTE / TT PSU please follow this greatt guide by @Pacman - https://www.exxosforum.co.uk/forum/viewt ... ?f=9&t=300
Original voltages before re-cap:
+12V (yellow) = 11.76V
-12V (blue) = -12.53V
+5V (red) = 5.17V
-5V (white) = -4.98V
+5V PG "Power good" (orange) = 5.16V
Original voltages before re-cap:
+12V (yellow) = 11.76V
-12V (blue) = -12.53V
+5V (red) = 5.17V
-5V (white) = -4.98V
+5V PG "Power good" (orange) = 5.16V
Re: Icky Projects
- Looks like the caps have been glued to the board and the epoxy is as stubborn as hell.