![]() |
Sharp EL-5800 Scientific Calculator: sturdy built and reliable machine - Printable Version +- HP Forums (https://www.hpmuseum.org/forum) +-- Forum: Not HP Calculators (/forum-7.html) +--- Forum: Not remotely HP Calculators (/forum-9.html) +--- Thread: Sharp EL-5800 Scientific Calculator: sturdy built and reliable machine (/thread-7267.html) |
Sharp EL-5800 Scientific Calculator: sturdy built and reliable machine - jebem - 11-19-2016 05:56 PM Got this machine since a long time ago, in dismantled state and waiting to be repaired. Today morning I decided it was time to start emptying the dismantled machines drawer, so I picked the one at the top of the pile. I have another model with similar build documented here. The only issue with this 1976 machine was the battery compartment that had oxidation in the power switch/battery terminal assembly. The machine was sold as non working. According to the Instruction Manual, this calculator takes two AA dry batteries, or the optional Ni-Cd battery pack EA-18B and the Ni-Cd Recharger model EA-17E. Look to Katie Wasserman site for the manual. After cleaning all the parts to remove the battery electrolytes products, it was time to repair, test and assemble it. ![]() Single chip machine: Hitachi HD36125 Display Futaba 9-ST-12 ![]() ![]() ![]() Keyboard assemblage. Note the metal spring interconnecting the front metal face plate with the keyboard metal frame assembly. ![]() ![]() ![]() The keyboard PCA snaps over the keyboard membrane and two screws fix it securely in place. ![]() Heavy battery corrosion has damaged the positive terminal in the battery compartment. I have these miniature battery terminals at hand, so have trimmed one of them and soldered it to the original remaining terminal. Could not do a clean job though, as the plastic assembly is soft and started to melt when soldering. I was too lazy to dismantle the whole set in order to be able to do a cleaner job. Still it is mechanically and electrically working fine now, despite the ugly looks. ![]() (continued) RE: Sharp EL-5800 Scientific Calculator: sturdy built and reliable machine - jebem - 11-19-2016 06:12 PM After power on. Current consumption = 62mA All digits lit. Current consumption = 80mA ![]() Main PCA folded and in place. ![]() Cover installed. It snaps at 10 different points (latches). It takes just one screw. ![]() ![]() Forensics test - asin(acos(atan(tan(cos(sin(9))))))result: 10.7508 ![]() Error condition on display: SQRT(-2): All zeros and all decimal points lit. ![]() Despite being boxy, it is still a nice looking machine. ![]() This is the package I got. ![]() ![]() |