Developing unit installation error

[iraklis7302]

Hi there

I’m trying to fix my C454 machine and I removed some parts from one C454 which I know worked well,to another.I have 2.my first machine is working well,but in my second appears the following message:developing unit cyan installation error.should I replace the dev chip unit to work?or should I replace all cyan developing graphite including chip?

thank you all

[Synthohol]

recheck the connection to the FSB

[iraklis7302]

recheck the connection to the FSB

I have already done this but nothing,thank you

[iraklis7302]

recheck the connection to the FSB
I inverted the dev cable and it works...thank you very much

[tsbservice]

This will happen when you put wrong developer unit.