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Help, No cyan or black
help needed for a soljet 740
Our printer is over two years old we are running it on Triangle Inks, and we have replaced all heads.
Suddenly today the black and cyan decided not to print. I have checked the lines nothing is blocked. It is not the dampers, they have just been replaced. Has anybody heard of this problem, or does anybody know of a print engineer in the midlands
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6 Replies
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Hi Stepen,
Try to check the left pump of the printer. One common element of those two heads is the pump.
If the pump is damaged, it won’t create enough suction on the heads to keep the chamber full of ink, and therefore won’t print properly or won’t print at all.
If you have to change the pump ask your dealer for the new generation of pump, they are design especially for solvent ink and are a lot stronger.
Good luck -
Thanks for the reply.
We have had the pumps replaced last month. the inkflow seems fine. when I test print there are no nozzles on either head.Cheers Stephen
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So, if it is not the pump it is probably the fuse for bank A on the head board.
I would definitely recommend to have a Roland tech looking at that as on Pro 2 the fuses are not easily removable from the board. -
I agree sounds like the fuse, but normally there is an underlying fault which causes the fuse to blow. One reason can be Solvent/ink getting onto head circuit board, could this have possibly happened when the dampers & lines was checked. I made the same mistake, had a blocked head that wouldn’t clean. Took the damper off to check it wasn’t causing the problem ink splattered onto circuit & fuse blew. I replaced mine myself its a little soldered on fuse approx 4mm square. I would recommend a techie doing it if you ain’t sure what caused it, it took e forever to find it. Point to remember turn machine off when working on the ink train.
Kev
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I have contacted Roland today , hopefully get a service techie out. Our previous Print Technician reckons without looking at it, It is the main board and we will have to replace that plus the heads.
He has sort of washed his hands of it .I hope you guys are right
Thanks for your replies
Stephen
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I agree with you guys. I have encountered the same situation. But there were two faulty points. There are bunch of driving transistors for each pumps which are lined in three rows. One row contains 8 transistors. Probably there is a faulty transistor in the first row (the circuit unit that drive the Black Cyan pump. The second problem is the fuse.
You should eliminate the cause that bring this problem. Check the pins of the belt (the cable connecting the head to board). If this pis are short circuited, you will do the same mistake.
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