Timex Sinclair 2068 faults

A place to discuss the ZX80's and ZX81's younger brother - the Sinclair ZX Spectrum
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gammaray
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Timex Sinclair 2068 faults

Post by gammaray » Wed Nov 21, 2018 12:03 am

Both of mine have video problems...caps?
5-TS1000,UK ZX81<-Sheelagh, US ZX81, 2-TS1500/KDLX , 3-TS2040 printer, 2-TS2020 cassette decks, ZXPAND+AY, ZeddyNET, ZXBlast, UDG, ZX8CCB, AERCO, BUILDS/REPAIRS ZX Spectrum, ZX80 Minstrel, ZXMAX48 v1 v2, 2-TS-2068, ROM, 16kRAM

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1024MAK
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Re: Timex Sinclair 2068 faults

Post by 1024MAK » Tue Nov 27, 2018 5:24 am

gammaray wrote:
Wed Nov 21, 2018 12:03 am
Both of mine have video problems...caps?
Symptoms?

Mark

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gammaray
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Re: Timex Sinclair 2068 faults

Post by gammaray » Tue Nov 27, 2018 3:03 pm

Keeping in mind that the units have both a RF and a composite output,
and that I used the same power supply.

TS-2068-ONE has no color but does black and white cartridges just fine.

TS-2068-TWO shows vertical bars and other video failure symptoms.

Checking for the powersupply:
http://www.old-computers.com/museum/com ... st=1&c=634
says "DVE power supply, 15 V at 1 Amp DC, and with the outside sleeve of the plug positive and the inside negative."

Also asking someone locally here about their power supply...

In contrast, the Spectrum failed when I used 12V so I went to a 9V 2A switching power supply.
5-TS1000,UK ZX81<-Sheelagh, US ZX81, 2-TS1500/KDLX , 3-TS2040 printer, 2-TS2020 cassette decks, ZXPAND+AY, ZeddyNET, ZXBlast, UDG, ZX8CCB, AERCO, BUILDS/REPAIRS ZX Spectrum, ZX80 Minstrel, ZXMAX48 v1 v2, 2-TS-2068, ROM, 16kRAM

McKlaud
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Re: Timex Sinclair 2068 faults

Post by McKlaud » Tue Nov 27, 2018 10:33 pm

For Timex Sinclair 2068 you should use a 15Vdc/1A power supply, 9V supply is too low.
Claudius
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gammaray
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Re: Timex Sinclair 2068 faults

Post by gammaray » Tue Nov 27, 2018 11:25 pm

Maybe why it was inconsistent. I believed I used a 12V PSU.

I was getting ready to wash in the dishwasher or replace all the caps.

Fixes Apple Macintosh boards from cap leakage. See YT videos.
5-TS1000,UK ZX81<-Sheelagh, US ZX81, 2-TS1500/KDLX , 3-TS2040 printer, 2-TS2020 cassette decks, ZXPAND+AY, ZeddyNET, ZXBlast, UDG, ZX8CCB, AERCO, BUILDS/REPAIRS ZX Spectrum, ZX80 Minstrel, ZXMAX48 v1 v2, 2-TS-2068, ROM, 16kRAM

dessony
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Re: Timex Sinclair 2068 faults

Post by dessony » Wed Nov 28, 2018 12:30 am

Gammaray,

What is your PSU's voltage reading, from your multimeter's view? Maybe your PSU have a problem with blown diode(s). Does your PSU smell burnt? Do you have an oscilloscope?

I have my TS2068 and a PSU with its label. DVE Model No. DV-141A "FOR USE WITH COMPUTER".

DesSony

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gammaray
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Re: Timex Sinclair 2068 faults

Post by gammaray » Wed Nov 28, 2018 12:55 am

That is the issue. I used the PSU that was in the original box without checking that it was the right one. Now no telling since it probably was the wrong one, unless I misplaced it. So far nothing that I have is 15V and still looking.
5-TS1000,UK ZX81<-Sheelagh, US ZX81, 2-TS1500/KDLX , 3-TS2040 printer, 2-TS2020 cassette decks, ZXPAND+AY, ZeddyNET, ZXBlast, UDG, ZX8CCB, AERCO, BUILDS/REPAIRS ZX Spectrum, ZX80 Minstrel, ZXMAX48 v1 v2, 2-TS-2068, ROM, 16kRAM

dessony
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Re: Timex Sinclair 2068 faults

Post by dessony » Wed Nov 28, 2018 1:26 am

Gammaray,

Can we find a schematic for the TS2068?

DesSony

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gammaray
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Re: Timex Sinclair 2068 faults

Post by gammaray » Wed Nov 28, 2018 2:17 am

Found this.

Excerpt...
TS2068 SCHEMATIC.png
Attachments
TS2068TM.PDF
(2.68 MiB) Downloaded 23 times
5-TS1000,UK ZX81<-Sheelagh, US ZX81, 2-TS1500/KDLX , 3-TS2040 printer, 2-TS2020 cassette decks, ZXPAND+AY, ZeddyNET, ZXBlast, UDG, ZX8CCB, AERCO, BUILDS/REPAIRS ZX Spectrum, ZX80 Minstrel, ZXMAX48 v1 v2, 2-TS-2068, ROM, 16kRAM

dessony
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Re: Timex Sinclair 2068 faults

Post by dessony » Wed Nov 28, 2018 2:59 am

Gammaray,

:oops: After a few minutes of using a search box, I also found the schematic with its lines cleaner. And only a page.

https://8bit-museum.de/scans/timex/ts2068schematic.jpg

However, we still can use both of these drawings.

Cheers,
DesSony

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