ahhh.. was looking for something "less complicated"
MegaSTE flashing keyboard light only
Re: MegaSTE flashing keyboard light only
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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.
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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: MegaSTE flashing keyboard light only
ok, so pin 5 and 9 are the output for the 556.
at the moment what I have easy at hand is a Multi meter, is there a worthwile test I can do there?
This is from the manual. it says pin 17 TTL high.. in this instance I assume thats 5v. but if I get the flickering 5v there.. all that shows me is what I already know issue with the reset circuit. How do I fix it?
I have tested the S201.. it works.. I get high and low on pin 8 of the 556. when pushing it.
James
at the moment what I have easy at hand is a Multi meter, is there a worthwile test I can do there?
This is from the manual. it says pin 17 TTL high.. in this instance I assume thats 5v. but if I get the flickering 5v there.. all that shows me is what I already know issue with the reset circuit. How do I fix it?
I have tested the S201.. it works.. I get high and low on pin 8 of the 556. when pushing it.
James
Re: MegaSTE flashing keyboard light only
Normally the 10uF caps go bad. Fitting 22uF can be better as well.
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: MegaSTE flashing keyboard light only
OK, found that the 12v line was shorted.
Found that C224 was shorted (from the 12v line)
I have a question though C226 and C227 frank had said should be 60ohm on mine they were about 120ohm
I tested on the other board to compare.. C224 was not shorted.. lol... but also C226 and C227 were 50ohm.
IF I have to replace anyway.. which is better? since its a cap.. I assume higher resistance is an issue? remove both the 470uf and the .1uf and test them? replace?
James
Found that C224 was shorted (from the 12v line)
I have a question though C226 and C227 frank had said should be 60ohm on mine they were about 120ohm
I tested on the other board to compare.. C224 was not shorted.. lol... but also C226 and C227 were 50ohm.
IF I have to replace anyway.. which is better? since its a cap.. I assume higher resistance is an issue? remove both the 470uf and the .1uf and test them? replace?
James
Re: MegaSTE flashing keyboard light only
Have you taken C224 out of the MB to test if its shorted or not ?
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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: MegaSTE flashing keyboard light only
James
Re: MegaSTE flashing keyboard light only
You are measuring the *entire* 12V rail doing that , not just the cap.. you cannot test stuff like that in circuit.. id be surprised if a 100nF cap was shorted..
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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: MegaSTE flashing keyboard light only
I am reading the whole 12v rail measuring from one lead to the other?
OK.. I can remove it. hoping to determine the issue before I heat up the iron.
James
OK.. I can remove it. hoping to determine the issue before I heat up the iron.
James
Re: MegaSTE flashing keyboard light only
One side is gnd, other 12V.. so *anything* on the 12V rail is of course all connected... measure across 12V on the floppy or HDD power cables..
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: MegaSTE flashing keyboard light only
But 12v is grounded on the board.
Without the PSU connected to the board. So I would think I have to figure out where 12v goes on the board.
James
Without the PSU connected to the board. So I would think I have to figure out where 12v goes on the board.
James