41CX schematics - 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: 41CX schematics (/thread-44803.html) |
41CX schematics - Michel Beaulieu - 10-21-2003 I already have the 41C schematics that can be found on the Museum CD set but i need the 41CX one in order to know the value of some small capacitors on the main board; where to find this information?
Thanks Re: 41CX schematics - Nelson M. Sicuro (Brazil) - 10-21-2003 Now that you mentioned it, I was looking at the schematics also. It isn't accurate, the chip named "RAY 8024" isn't the LCD driver, is the power supply chip. The schematics that I have is from a HP-41C. The 41CX may have another power supply design, but try to measure all discrete components and compare with the marked value on them (color-coded resistors and "cryptic" marked capacitors, you need to be familiar with that). Old capacitors usually are the guilt.
Good luck!
Re: 41CX schematics - Michel Beaulieu - 10-21-2003 I just change the 2 electrolitic ones without resule. Now i want to change the tiny colorful capacitor near the coil but i don't know their capacity. It written on them : a orange one : 471 2 orange : 352 one tiny blue : 1517
There is also a small but "long" metalic component glue on a spongious tape that i don't know what it is; if i do i will be able to try another one.
Re: 41CX schematics - Holger Veit (DE) - 10-22-2003 >Now I want to change the tiny colorful capacitor near the coil but i don't know their capacity. It written on them : 471 is 470pF
352 is (theoretically) 3500pF, but this is not a standard
The rule would suggest the tiny blue one is 15*10^17pF but
Holger
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