View Full Version : Monroe Calculator Repairs

August 20th, 2013, 12:25 PM
This is one of the gems I pulled out of Weirdsstuff Warehouse. Aside from damaged nameplates and a scary power cord it is in great shape.

This is what it's like when it works:
Will not lie. Really freaking cool, but the key word is "when it works"

Mine is jammed. The ACC MULT and ENTER DIVD keys are stuck down. This in turn seems to be leaving the motor running which itself is giving off a REALLY nasty smell like it needs oil.
I'm not exactly sure how you service the machine and I'm having trouble. You can't reach anything by removing the cover on the keyboard and even if you take out the four bolts underneath it feels like the two halves of the plastic shell are glued together. Does anyone here have more experience with opening the machines up?

August 20th, 2013, 06:43 PM
Just a bit of an update.
The case does NOT split apart at the seam. You remove the four bottom bolts, remove two screws around the keypad and two brackets, put the unit upside down and tilt the case off.

It was pretty nasty inside. I ended up giving everything a fairly good oiling which freed up everything after a a bit of testing everything. I can now get it to add, subtract and semi-accurately divide but I still have no clue how the multiply function works. Now my problem however is that when I have the subframe back int he case and bolted in it starts jamming again.



September 11th, 2013, 11:15 AM
Almost all jams can be fixed by taking the carriage off, the machine will then run to the cycle end. The snag then is to work out the rest position, rotation, of the carriage to replace it. Removing the carriage is easy, once you have found the little catch or catches. Because removal is a common occurance then it is easy, look along the front of the carriage for a groove, the catch slides in that. Look on John Wolffe's web site for lots of info.