SP-300V Fuse Blowing Problem

Your mainboard may be bad.

After you replace the fuses and put board back in machine, unplug the 2 main ribbon cables (cables go from Main board to print/cut carriage board). Turn the printer on, then turn off...check fuses, if ok then board is ok.

Items that can cause the fuse to blow.....

Bad Cables
Bad Boards
Bad Head

Good Luck

PS-I have had a bad motor for the wiper that kept blowing the power supply board.....electrical shorts can be soo much fun!!!

My .02

GTSTech

 

If it's taking out the fuses as soon as you connect te servo to the main board, that may be a good indication that one of the boards is bad completely.

 

@GTSTech_1

Ink plumbing issues, dampers, captops, head adjusts, etc... are all easy repairs.

It's when you need someone to chase down shorts is when an experienced field tech is invaluable.

Don't you just love curling up with a Roland schematic to follow signals/voltages???

~E

 

Not to hijack this thread, but I'm running into a very similar issue.

Long story short, I was getting dropout on my black and after repeated cleanings it wasn't doing much better. One final cleaning by putting the syringe with cleaning fluid on the manifold resulted in some liquid leaking out (crap!). The black/cyan printhead then stopped running completely.

I replaced the print head (I had one on order because of the dropout anyway) and still no go. Checked fuse F3 and it was blown. I replaced F3, (had an electrical repair place do it holy smokes those things are small). Hooked everything up and still no black/cyan. I just checked F3 again and it's blown.

I have good suction on the black/cyan when pulling from the cap.

Please help. Please. I am five hours from the nearest Roland dealer and at $90 an hour for driving time, plus $150 an hour it's a bit out of my ability to pay (I'm in my first year of business too). The tech has been helpful, but even changing the fuse is over his head.

Thanks folks!

 

Cables??

@Optic

Sounds like a cable issue.

Is the M/Y head firing correctly? If so, replace the fuse and use the flex cable from the known good head on the K/C head. (Just leave the M/Y unconnected). If it blows again, it's not the cable.

I have also seen a damaged cable actually pull the pins out of the connector itself. The edge of the cable kinda grabs the pin and out it comes. Something to keep in mind if you feel resistance on the cable...

As for the question about avg tech rates... it's all over the place. Roland dealers here in the Northeast are charging every where from $100 to $200 onsite and with $75-$100/hr travel. If you can find an independent guy (wink), he will usually charge around $75/hr onsite and $50/hr for travel.

... for what it's worth...

~E

 

Yes - the M/Y head is firing correctly. Doing a cable swap of both cables (switching the cables completely from one head/connection to the other) results in M/Y head continuing to work properly.

I tried attaching the cables from the K/C head to the M/Y connector, but then I get a temperature warning as the other cables aren't hooked up and the machine uses the K/C head for measuring head temperature.
[edit] I am hesitant to attach the K/C control cable to the M/Y head. Something in my gut says don't do it.

Help!

 

Mainboard cable

Did you ever unplug the cable from the mainboard to the carriage board as GTSTech suggested to help rule out a mainboard issue?

~E

 

HJI, i have the same problem!!!, go to the http://jemmings.com website, they will repair your main boarf for 500 bucks, we do 2 months ago and my sp 540 is runing all day!!

 

Ok - an update!

The fuse is blowing when it's installed because one of the transistors has failed (so it blows the fuse immediately when power is put on).

I'll be looking at buying some new ones. Anyone know of cheap suppliers for these? I know macmedia has them, but I'll replace all of them rather than just the affected one and they are $10 each.

 

Optic, which transistor do you think has failed?

 

The transistor was an A1746.

I've sent my board away as buying a new set of transistors and having them replaced locally (with no guarantee) was roughly the same price as sending it to MacMedia for their guaranteed service.

 

how did you test the transistor? i am having the same fuse blowing issue after changing print heads....joeb

 

Did you ever figure out your problem. I'm having problems. I tested the F2 & F3 fuses and think they are ok but now I'm questioning myself. I'm thinking about changing them just to rule that out. Thoughts?