blank in black

[mikadonovan]

I ran into a similar issue with a MP C5503 and found that one of the gears was chewed up. I would remove the black PCDU and check the gears.

OR, you replace the 300 K PDCU and forget to reinstall the drive gear (I speak from experience).

[johnnyquest]

thank you everyone for your input. the issue was the k dv clutch

[mikadonovan]

Glad you got it fixed. That is an odd one. I have serviced a whole bunch of these over the years and never had to replace a dev clutch.