
With the new screen it's only visible when the contrast is very low (pictured).
Any thoughts about what might be causing this?
Oh, I didn't realize it was across screens.
It doesn't seem to use those leaky 90's surface-mount capacitors. You could try replacing the electrolytic ones but on my 1984 QL, I haven't touched them and things work well. I follow Adrian Black, from Adrian's Digital Basement, who advises to not replace 70's and early 80's ones if they look good. Seeing as how cheap Clive manufactured things, I would suspect his 1986/87 creation may fall under that.
Thank you for finding that!g7mmj wrote: ↑Sat Mar 11, 2023 11:24 am The service manual is available on line at https://cambridgez88.jira.com/wiki/disp ... bridge+Z88 (it's in there somewhere, although I get an annoying "Browser not supported" error since they changed something a while ago)
Anyway, the relevant paragraph says:
<quote>
1.2 Adjustments
There is one adjustment only on the z88 main board. With the index
page displayed and potentiometer RV1 set to minimum the menu topics
should just be visible on the screen. If the topics are not visible adjust
padding potentiometer RV2 until the topics are just visible. Padding
capacitors C17 and C18 are factory set and must not be adjusted under
any circumstances.
</quote>
Hope this is of some help.
Steve
I think the main limitation is money. You can absolutely do that, but would it be worth $300 apiece?Jbizzel wrote: ↑Tue Feb 14, 2023 3:07 pm https://hackaday.com/2019/03/03/designi ... computers/
Would something similar be possible for the z88?