RF-640 test print problem

[Topimpress]

Hi,
I have made a test print and I have problem with..
any idea what's is the problem

 

[damonCA21]

That is a problem with the on and off signals being sent to the head. This can either be from bad cables ( either the short ones to the head or the long ones from the print carriage board to the mainboard ) a bad mainboard or a partly shorted head

 

[Topimpress]

thx for ur reply..
did the transistor C4131 cause the problem.. I found one with 17ohm on the two outside legs
all other is about 41.7

 

[damonCA21]

OK that can also cause problems as they turn the head on and off. Change that transistor and it may fix it if there are no other problems. If it is reading 17 ohms then it has most likely shorted