Posts: 172
Threads: 13
Joined: Jul 2005
I haven't seen any problems with the hinges on the calculators in my collection. The main problem is the battery door, which is easy to damage when changing the batteries. I've seen a few calculators with flakey displays. The keyboards seem to be pretty durable.
Posts: 85
Threads: 10
Joined: Jan 1970
The only thing that I've known about that was bad about these units was that when I bought my first units in the late 80's, it kept losing memory if it was shaken a little, say when in a brief case. It was a few months old at the time and after getting frustrated I took it to a HP retailer who, after checking the serial number, replaced it with a new model. He told methat a bad batch were made with faulty battery contacts.
Apart from that, the unitis in pristine condition and I have no trouble with either battery cover or hinge. Nice unit. Won't part with this one foe anything
Paul
Posts: 195
Threads: 25
Joined: Jul 2005
Hello,
Other than the battery door, there are no major problems with the 28C/28S. One of my 28S accidentally hit the ground a couple times but nothing happened.
I had to put my 28Ss under storage for three years, with batteries. All of them had the clock program; when I took them out from storage it was still running and kept time more accurately than a wrist watch.
My two cents.
Posts: 1,089
Threads: 32
Joined: Dec 2005
Randy reported broken plastic rivets to cause keyboard failures, not the hinge IIRC. Aside from this potential problem and the battery door, the clamshell models seem to be quite reliable. I have and enjoy an 18C since years and lately got a 19B.