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There is no microprocessor in a KX-1901 that I know of (at least not in the Euro model). Which board do you need? I may have some spares, but I don't know how much is interchangable between the US and Euro models.
The boards are listed as follows in the service manual:
T board: Teletext (actually RGB in)
V board: Indicator
N board: Remote control
C board: RGB out
H board: Customer controls
U board: Tone/vol/col/pic control, AF amp, 12V reg, Pic decoder buffer
B board: PAL chroma, SECAM chroma, V count down, auto pedestal
D board: reg amp, hv osc, v out, system select, pin amp, 12v reg
I agree that is it far better to repair the actual fault on the board you have, though donor boards are often the only source for otherwise unobtainable ICs.
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