Hp91 with very dim display

[teenix]

(08-03-2020 04:21 PM)James Linder Wrote:  Will do. I've had a 97 apart a few times and both ends of the display ribbon cable appeared to be soldered onto the the two PCB's. I see that the printer ribbon can be removed, however I did not think the display ribbon was removable. Being new to Topcats, I'm just telling you what I tought I saw, not for I know for certain of course. Thanks!

Just in case you are not aware, you cannot just pull out the printer ribbon cable without damage. You must use something thin and wide enough which can be inserted between the cable and connector to move the connector fingers away from the cable. If you just try to pull it out, the fingers will dig harder into the cable. I used a piece of aluminium soft drink can with smoothed edges, but there are other ideas in various Forum posts.

The display ribbons I've seen can be carefully removed from the circuit board end, but the pressure required for removal/installation may damage it because of its age. There are no connector pins as such, just tinned wire ends and it would be a horrible repair job if any of those wire ends broke off. I think unless necessary, it is best to leave it as is.

cheers

Tony