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View Full Version : Display quality - Kaypro II > 10?



dmemphis
November 2nd, 2016, 05:15 PM
This is probably bordering on the silly, but as I work on a
Kaypro 10 I find the screen kind of annoying to look at
compared to the Kaypro II have sitting right next to it.
The 10's screen is less sharp. The II's is prettier- bright, inviting.
The 10's background is darker which may reduce glare.
Perhaps the intent on the 10 was to also get more contrast for the
sake of reverse video? Programs set up on the 10 tend to use, I see.
ie: Wordstar has the help menu rendered in reverse, which is... also
kind of hard to read.
It might partly be the font difference, but the II characters are well
articulated dots, the 10's are solid lines, a bit fuzzy. Some chars like
8s and Bs are hard to distinguish.
Or it might be adjustment needed to make the 10 shine.
But I don't see anything like a sharpness control on the video board.
I have a spare II and I'm considering swapping in the entire
display subsystem into the 10.
Any advise?

gertk
November 3rd, 2016, 01:02 AM
There should be FOCUS and BRIGHT adjustment pots on the monitor board, see if adjusting these helps.
The location varies a bit depending on the brand of displayunit used in your Kaypro. (See service manual)

Another thing that can cause unsharp/distorted display is misalignment of the deflection yoke, it sometimes has moved backwards over the years on the tube.
There should be a screw on a metal collar on the deflection yoke which needs to be loosened first.
Be careful though, the 'neck' of the tube is fragile and after poweroff there can be residual high voltages on the tube and board.

dmemphis
November 3rd, 2016, 06:55 AM
Thanks, I read the service manual and found the focus adjust for this board.
It was tucked way in there closest to the front of the computer.
Unfortunately, turning it has no affect.
I think the appearance is the nature of the beast, but I may get the ALIGN diagnosic
to check that the readability isn't being affected by a geometry problem.

I might bite the bullet and do a video system swap just to see what it looks like with the KII components.
Its a lot of work and I'm kinda tired of tearing this K10 down after just going through an entire
floppy and hard drive overhaul.
I was hoping someone might chime in and say yeah or neah on the swap based on experience.

EagleTG
November 11th, 2016, 11:33 AM
Oh why would ANYONE tire of tearing down a Kaypro? Their internals are perfectly laid out as to ensure the least possible frustration during disassembly! </sarcasm>

I'm with Gertk, there's probably some adjustment somewhere that needs some tweaking. Additionally, maybe there's a cap on its way out.

glitch
November 11th, 2016, 11:50 AM
Additionally, maybe there's a cap on its way out.

This turned out to be the cause of an inability to uniformly focus the screen on a previous Kaypro I'd owned. You could get the center sharp, and the edges would be fuzzy, or you could get the edges sharp and the center would be fuzzy. I forget what I ended up replacing to correct.

dmemphis
November 11th, 2016, 08:25 PM
The focus is completely uniformly fuzzy. So we are not talking about a cap here.
I guess I need some side by side pictures so ya'll can see
what the K10 looks like and why I call the KII so superior. I'll work on that.
Or I'll just spend a few hours moving the KII video over and see what I get.