No Print Out Pro 4900

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1

Please Help,

ive got 2nd hand deffective 4990, but there is just 4 noozle in cyan, and the rest of 9 colors are blank

i already disassmble the head, ang manually flash it using the Syringe and i saw the straight and verry good noozle avery colors. .

the problem is, after i assmblke back the head to the printer, it’s still no print out …

can anyone expirience this? or some advice what can i do to fix this??

Thanks in advance