Bad resistor?

Problems with your machine in general.
Post Reply
User avatar
jan.pohan
Posts: 2
Joined: Fri Jun 07, 2019 7:39 pm

Bad resistor?

Post by jan.pohan »

Hello i have opened my Atari Ste, for checking DMA version, and i have found nearby DMA chip /square one/ this leaking resistor (see picture attached). But Atari works fine. Is it possible still save board? i have paid quite lot for this ste... thank for advices
Attachments
20190601_172320.jpg
20190601_172320.jpg (193.66 KiB) Viewed 2992 times
User avatar
exxos
Site Admin
Site Admin
Posts: 23498
Joined: Wed Aug 16, 2017 11:19 pm
Location: UK
Contact:

Re: Bad resistor?

Post by exxos »

That will be flux.. something has been messing with the resistors and made a bit of a bad job of it by the looks of it.
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.
tzok
Posts: 337
Joined: Sat Dec 30, 2017 2:27 pm

Re: Bad resistor?

Post by tzok »

These are not even resistors, but just a fancy jumper wires... apparently someone moved them from one position to another from the top (without removing the board from bottom case).
User avatar
rubber_jonnie
Site Admin
Site Admin
Posts: 10472
Joined: Thu Aug 17, 2017 7:40 pm
Location: Essex
Contact:

Re: Bad resistor?

Post by rubber_jonnie »

As tzok said, zero ohm resistors used as links. I'm guessing they were moved to change or upgrade the TOS ROMs. As exxos said, looks like a poor soldiering job, but you can probably clean up the flux with isopropyl alcohol
Collector of many retro things!
800XL and 65XE both with Ultimate1MB,VBXL/XE & PokeyMax, SIDE3, SDrive Max, 2x 1010 cassette, 2x 1050 one with Happy mod, 3x 2600 Jr, 7800 and Lynx II
Approx 20 STs, including a 520 STM, 520 STFMs, 3x Mega ST, MSTE & 2x 32 Mhz boosted STEs
Plus the rest, totalling around 50 machines including a QL, 3x BBC Model B, Electron, Spectrums, ZX81 etc...
User avatar
jan.pohan
Posts: 2
Joined: Fri Jun 07, 2019 7:39 pm

Re: Bad resistor?

Post by jan.pohan »

Thanx guys for quick help. So it seems someone upgraded TOS chips probably? It has 1.62, but i thought it was standart for 1040 STE manufactured in 1990 and later... But TOS chips could be changed also because of language i think.
Also could you say if this is original floppy?
I was decided to do proffesional recap immediatelly, should i do it anyway or is it risk for board?

Thanx a lot
Attachments
20190601_172259.jpg
20190601_172259.jpg (145.85 KiB) Viewed 2965 times
User avatar
exxos
Site Admin
Site Admin
Posts: 23498
Joined: Wed Aug 16, 2017 11:19 pm
Location: UK
Contact:

Re: Bad resistor?

Post by exxos »

Looks like original floppy.. STE machines mostly had 1.62 fitted, but early ones had 1.06... Most upgrade to 206 these days. Recapping the PSU should be done at least.
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.
Post Reply

Return to “HARDWARE ISSUES”