Spectravideo svi-808 pc

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Re: Spectravideo svi-808 pc

Postby LS120 on Tue Jan 25, 2022 4:40 pm

so yes it is what i was hoping it was not..... hmmmm looks ok at first glance.. lets remove the rubber and check it out...
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LS120
 
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Re: Spectravideo svi-808 pc

Postby LS120 on Tue Jan 25, 2022 4:42 pm

hmmm a bit of a clean and maybe all good...
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LS120
 
Posts: 491
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Re: Spectravideo svi-808 pc

Postby LS120 on Tue Jan 25, 2022 4:44 pm

ohhhh no don't tell me.... yep some ones had a go on here.. maybe a board remake....
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LS120
 
Posts: 491
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Re: Spectravideo svi-808 pc

Postby LS120 on Tue Jan 25, 2022 4:47 pm

oh well its all in a box now till i make up my mind....... at least i have the parts that i can read...
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LS120
 
Posts: 491
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Re: Spectravideo svi-808 pc

Postby LS120 on Mon Feb 14, 2022 9:21 am

ok so some update info for you guys/gals... i have the first re-make of the dc-dc power boards coming for the 808 systems.. thanks to the people whom looked over the board's i re-designed.. will be a few weeks i think.. before they get here.. will keep you posted.. also some one in the group has made a cad of the key stalk plunger to be 3d printed but on several try's i think they need to be resin printed as the fdm is not fine enough..

keep safe all..
LS120
 
Posts: 491
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Location: Wellington

Re: Spectravideo svi-808 pc

Postby LS120 on Sun Jun 05, 2022 12:43 pm

well dosen't time fly... it's been a bit since i have updated on here and if you have been on the facebook group you will see where i am up to with the 808's as of now... but fear not i am going to put it all on here too.. also going to do a repair part on rust removal and re-plating parts in nickel. so stay tuned.....
LS120
 
Posts: 491
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Location: Wellington

Re: Spectravideo svi-808 pc

Postby LS120 on Sun Jun 05, 2022 1:01 pm

ok so from where i left off ...... what i did was in January..

well opened the SVI-808's today and the psu's have problems.. as i was expecting from the blog that he was writing.. so the next step is to go through to see where & what voltages are missing.. it uses a dual 16v ac power pack to a dc drop down board.. and its the normal 5+,5-,12+, 12- and ground so if its totally dead its and easy replacement option.
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LS120
 
Posts: 491
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Re: Spectravideo svi-808 pc

Postby LS120 on Sun Jun 05, 2022 1:05 pm

ok im looking for someone whom maybe able to help he out.. what i'm doing is remaking the DC power boards for the svi-808's as the quality is not good.. i have made the circuit in kicad and it checks out ok... i just need someone whom knows this stuff to look it over to make sure its ok..
thanks for any help.. and PM me if you would like to help out.. (sorted now thanks)
LS120
 
Posts: 491
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Location: Wellington

Re: Spectravideo svi-808 pc

Postby LS120 on Sun Jun 05, 2022 1:15 pm

well they finally got here.. now to test one out... these are for the 808/828/838 dc-dc power..
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LS120
 
Posts: 491
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Re: Spectravideo svi-808 pc

Postby LS120 on Sun Jun 05, 2022 1:16 pm

For sale 1 x SVI-808/818/838 DC-DC internal replacement Boards only.. re-designed as was not happy with the original quality ones. use all your existing parts or could help with some parts (regulators and diodes etc for extra) the Board's are $15 each + P&P
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LS120
 
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Re: Spectravideo svi-808 pc

Postby LS120 on Sun Jun 05, 2022 1:21 pm

well a start on the SVI-808 power boards and now i just need to find the damn 1n1004 diodes ... it's been a few months for all the bits to arrive i have put them in a safe place... but where lol
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LS120
 
Posts: 491
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Re: Spectravideo svi-808 pc

Postby LS120 on Sun Jun 05, 2022 1:22 pm

and voltages test good now..
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LS120
 
Posts: 491
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Re: Spectravideo svi-808 pc

Postby LS120 on Sun Jun 05, 2022 1:28 pm

Well got some more done on the 808 dc boards today.. and after finishing off had some issues and had to do 1 mod to the board.. the fab house didn't see i had put a ground through the 5v rail. but pass the inspection.. oh well... after that small fix it powered up fine.. just the 12v a little low.. but should be ok.. on power up the 808-SVI badged pc wood boot but had a blank screen.. so after trying a different screen i tried the 808-franken badged pc and that booted ok with the same screen.. so looking at the board the Yamaha chip looks a little crusty.. so maybe a clean and reflow.. will see.. the sound was not too good on the 808-sv so took the board out and it looks like the silver fish liked it more than the last owner,, lol.. so off it comes.. (need new one put in) so that's where I'm up to for now.. i did find the 808-franken pc had the ram card to take it to 640kb but it would be a little flakey at times so took it out.. and it seems ok now..
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LS120
 
Posts: 491
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Re: Spectravideo svi-808 pc

Postby LS120 on Sun Jun 05, 2022 1:31 pm

Well it is not too often i have to clean out cases like the SVI-808 pc.. i have put the bolts and din shield covers etc. in to a rust remover to soak, then i cleaned the case.. what a state it was in.. after that i did the main board. now I'm sure they have not looked that clean in a long time.. lol.. i also started rust treating the shields as well.. not sure if i will paint them or not.. also wonder if i should retro brite the case.... on the fence with that one.. also on cleaning i found what could be the problem with this board not showing on the screen.. the 16kh crystal has a broken leg... so will dig out one to replace it with.. and maybe the few electro caps that are on the board as well..
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LS120
 
Posts: 491
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Re: Spectravideo svi-808 pc

Postby LS120 on Sun Jun 05, 2022 1:33 pm

case is not too bad but still needs a clean.. or was it lol...
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LS120
 
Posts: 491
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