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28-03-2013 #1
Hi Asto, this is a bit strange.
I've posted some pics of an SD2 with a CD20 next to it. The cd20 has another board in the centre of the two heatsinks which is removed to show the main board, this board has four leds on the left hand (rear) edge.
The Denford Orac used both types of drive, the cd20 version has a higher voltage psu (around 65v-80v), and the sd2 version has a 35v ish psu.Last edited by i2i; 28-03-2013 at 07:30 PM.
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28-03-2013 #2
i2i...the second pic from left to right and the 4rth are pretty similar to mine almost identical but i see the white plastic socket contains three lines of contactors. Mine has two connecting the main board where the high power transistors are with the signal processing board where the logic ic's are located and the leds are on this one the one on the top. You re right!
The first pic that i sent was borrowed from the internet not real mine...So it looks you have some point here.
The one with the exposed PKS0320 was taken by me few days ago.
I can send you new photos that i can have from my machine tomorrow.
The first board though which i see must have come off a Triac mill. My Triac uses them because I can see the driver ic there covered under the flat springs. It is the L298. I had to replace this once.
cheersLast edited by asto; 28-03-2013 at 08:47 PM. Reason: corrections
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28-03-2013 #3
The Triac does use the sd2 drives on the x and y axis, and an sd3 on the z axis. This is on models up to the early 90's, and then they changed them to the sd12/13 drives.
Is your Triac one of the green ones with the open frame or a mixed white and green one?
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28-03-2013 #4
Yes right! The green one.
But painted Grey.
An old open machine from the 80's.
i2i...Do you want to sell any of these boards?
cheers
Asto
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