Hi, managed to pick a 9900 very cheap with both black channels not firing at all.
Unfortunately is sat for 10 days with no inks, I had some cartridges with some ink so could do a test print, but now i have both blacks, orange and magenta showing no test pattern.
I have a set of dampers and a maintenance kit, refillable cartridges are on there way.
Would be nice to get all channels working, but would be happy 7.
What is best procedure?
Use flush cartridges in just problem colours and run some power cleans?
Should i try an initial fill with flush carts in all channels?
Should i change the dampers and install maintenance kit first, or after trying the above?