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Searching finds that it is a Cybernet board likely built for the overseas export market.
PCMA031A looks like the board number but I don't see schematics posted online.
If you can open the radio and post some pictures of the main board to see if you can confirm that board number.
At the link below is a extensive list of Cybernet radios, I do not see that board listed.
You may have to identify with whatever is close and work with that.
See link, sorry I do not speak French.
If you scroll down there are downloads.
Hello gentlemen and Ladies. I have the dreaded RCI-2990 receive issue where my radio gets distorted when people get close to my location. I found the C90 Capacitor, but I can not for the life of me find the C89 capacitor. Can or does anyone have a picture of the exact location of C89 ? Thank you in advance, Wes
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