DMP 2000 - Revival

[Strike4711]

Greetings,
I'm currently trying to revive a DMP 2000 printer.
The self test works fine but I cannot print via the CPC.
Tried three different CPC (464, 664 and 6128) with different cables.
The result is always the same, no print out.
I have started the trouble shooting with checking the cables and also the Centronics connector on the PCB.
No issue found so far.
Have any of you ever had a similar problem?
Some tips where to look next would be really helpful.

Thanks ...