EEVblog Electronics Community Forum
Products => Test Equipment => Topic started by: Robert763 on June 26, 2020, 04:33:45 pm
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Hi,
My CRTU-RU (same as CMU-200) has a keyboard fault. The soft keys under the screen don't work. It's NOT the membrane and having checked pull-ups and decoupling it looks like the P87C552 (8031 clone) keybord controller chip. On this board the PLCC chp is in a socket and marked FMR6P.055. The controller is a FMR6T3.
I know some members broke up CRTU's. Does anyone have a spare P87C552?
Thanks in advance.
Robert G8RPI