no color from one printer head roland sp 540v

If you know ink flowing through the head and it still doesn't fire, the head fuse has blown on the main board. Depending on how old your model is, it might be a socketed fuse which is easy to change but if it's older, you'll have to solder it.

 

Power down and unplug the power cord. Remove the back cover over the electronics. See the attached drawing for fuse location. The 2 fuses will be between the 2 large white ribbons that go into the carriage train. Set your multimeter to the most sensitive resistance scale. Use a regular multimeter, not a clamp-on voltmeter. Good fuses will read zero. A bad fuse will not read anything.

 

Looks like Jim has the answer to your issue, but as far as your general question:
I do a manual head cleaning once a week.
At the beginning of every day of printing, I do a test print to check the heads. If There's any dots missing, I'll have the machine do a regular cleaning.

 

This should be how every printer operator should start the day...

 

I agree. We start out every day with a test print and color bar print. Then after lunch we do the same. But our printers are running pretty much non stop all day long and I have 1 woman that babysits 3 machines and 2 plotters.

As for your problem its either a fuse or ribbon cable.

 

If you didn't fix the issue that made the fuse pop in the first place, it might have popped again. Make sure you are working with themachine turned off and unplugged. Then wait for about 15 minutes before working on it. Then check the head cables on both ends for damage, ink splatter, or corrosion. Replace as necessary. It's usually the head cables but I like to air dust all the terminals just in case. At the end of the day, if the fuse isn't blown and it still won't fire, the head is either clogged completely or fried electronically.

 

Which components that burned the fuse? Please be specific...