15C w/broken keyboard - Printable Version +- HP Forums (https://archived.hpcalc.org/museumforum) +-- Forum: HP Museum Forums (https://archived.hpcalc.org/museumforum/forum-1.html) +--- Forum: Old HP Forum Archives (https://archived.hpcalc.org/museumforum/forum-2.html) +--- Thread: 15C w/broken keyboard (/thread-10267.html) |
15C w/broken keyboard - Ion Abraham (New Mexico USA) - 07-25-2001 Hello, Well, the seemingly impossible seems to have happened. I did not think 11 series calcs could break, but this one did, one day, for no apparent reason. I have a 15C with two non functioning columns of keys, the fourth and seventh columns. That is, the column that includes the cosine key, and the column that includes the numbers 7,4,1,and zero. None of the keys in these two columns work. Can this be repaired? It's obviously some hardware problem. Anybody care to take a crack at fixing it? Any suggestions would be greatly appreciated.
Ion Abraham Re: 15C w/broken keyboard - Erik Wahlin - 07-25-2001 I believe the problem is a bad connection between the flexible PCB and main keypad PCB. It is in the far upper right is you take the cover off and are looking at the calc. from the back. There is one of those spongy silicon type connectors that HP used that has imbedded wires. You might try cleaning the connector first. The back part of the case applies pressure to this contact when it is screwd to the front case. The flexible connector is aligned on two plastic pins. Re: 15C w/broken keyboard - Tony Duell - 07-25-2001 Although the earlier 11C and 12C machines had the separate logic/display module with the zebreastrip connector to the keyboard PCB, I thought all 15Cs and 16Cs were on one PCB (keyboard, display, chips). Certainly all the ones I've worked on have been Re: 15C w/broken keyboard - Erik Wahlin - 07-25-2001 Tony, you might be right about the connector not being omn HP-15C's. I had a similar problem with a 10C but was able to fix it by tackling the zebra connector.
Re: 15C w/broken keyboard - Ion Abraham (New Mexico USA) - 07-26-2001 Dear Tony and Erik,
Thanks a lot for your suggestions. I hate to sound like such a rank novice, but let's back up to, how do you take the back cover off, as in dissasemble the thing? Thanks again,
Ion
Re: 15C w/broken keyboard - Erik Wahlin - 07-26-2001 Remove the 4 screws located under the rubber pads on the bottom of the case. Remember where all the small parts such as plastic strips and small spring contacts that ground the back label go.
Re: 15C w/broken keyboard - Tony Duell - 07-26-2001 Peel off the 4 feet. To prevent the adhesive picking up too much dust, I normally stick them onto a piece of the backing paper you get from sticky labels or rub-down letters. Temp Control Setting? - Ion Abraham (New Mexico USA) - 07-26-2001 Dear Tony, Thanks very much for your thorough advice. You mention a temperature controlled soldering iron. I have access to one, so do you have a recommendation for the setting?
Ion
Re: Temp Control Setting? - Tony Duell - 07-27-2001 I still use one of the old Weller Magnastat irons, and I use a #8 tip. That's 800F, or about 425C. |