TS1000 with no image :_(

Discussions about Sinclair ZX80 and ZX81 Hardware
bola_dor
Posts: 73
Joined: Wed Oct 02, 2019 5:32 am

Re: TS1000 with no image :_(

Post by bola_dor » Thu Mar 26, 2020 5:35 am

Did the static test.
Without the ULA, Z80 pin 6 is high at 5.4v
With the wire from ULA socket pin 14 to pin 40, Z80 pin 6 is low at 0.13v..
So Tr2 is good.. :D
I wonder why ULA pin 14 gave me such a low tension..?
May be tomorrow I can get access to an oscilloscope..
What should I look for?
Perhaps the picture helps someone in the future..
Just for the curiosity, why does it has to be a solid core wire?
Thanks again!!
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Paul
Posts: 1075
Joined: Thu May 27, 2010 8:15 am
Location: Germanys west end

Re: TS1000 with no image :_(

Post by Paul » Thu Mar 26, 2020 7:36 am

bola_dor wrote:
Thu Mar 26, 2020 5:35 am
Just for the curiosity, why does it has to be a solid core wire?
Because multi Filament wires don't go into the holes of a Socket.
And if you put solder on them they might already be too thick to fit into.
And even more critical: These tinned wires tend to break off where the Solder stops making it near to impossible to get the rest out of the socket.
Kind regards
Paul
In theory, there is no difference between theory and practice. But, in practice, there is.

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