ROLAND VP-540 Will not power up

[Adam Edge]

Hi All,

VP-540 not poweing up. checked board fuses are ok. Replaced main board and powers up so problem is with main board. Does anyone know what to check on board? I have the working board so I can compare componant values. Can someone point me in the right direction please. Thank you!

P.S also checked and working battery and 8 head transistors

 

[damonCA21]

The fuses and head transistors on the mainboard don't have anything to do with the power. You need to trace the power from the input through the board, test voltages to the chips, check caps, transistors, regulators, look for shorts etc.. To be honest it's not something easy to do if you don't understand circuits.
You can spend hours checking it and not find the fault, you are better off getting someone used to repairing and diagnosing boards to do it for you. It could also be a failed main chip, which isn't repairable as you can't get replacements.
Having a working board can be useful, but you need both boards powered on at the same time to test them against each other
I do do board repairs for the VP, but am in the UK so you would need to send it over here for me to be able to diagnose it for you .

 

[damonCA21]

Hi All,

VP-540 not poweing up. checked board fuses are ok. Replaced main board and powers up so problem is with main board. Does anyone know what to check on board? I have the working board so I can compare componant values. Can someone point me in the right direction please. Thank you!

P.S also checked and working battery and 8 head transistors

Hi Adam, just replied to your ebay message as well, feel free to message me on here

 

[Adam Edge]

haha, thanks mate just saw!
I see what you mean. found this guide, might give it a go:

Repair Your Roland VP540 and Other Expensive Equipment

Repair Your Roland VP540 and Other Expensive Equipment: I post this instructable for those who are sick of the extreme high price for spare parts that are not suppose to fail in the first place. In this case a friend who ownes a printing workshop called me to troubleshoot his Roland Versacam...

www.instructables.com

 

[damonCA21]

haha, thanks mate just saw!
I see what you mean. found this guide, might give it a go:

Repair Your Roland VP540 and Other Expensive Equipment

Repair Your Roland VP540 and Other Expensive Equipment: I post this instructable for those who are sick of the extreme high price for spare parts that are not suppose to fail in the first place. In this case a friend who ownes a printing workshop called me to troubleshoot his Roland Versacam...

www.instructables.com

No problem, the caps are something always worth checking anyway. It is unusual for them to fail on a VP board though, I see this only occasionally, but worth giving a go. If you do decide to change them, be very careful desoldering them as it can lift the pads !

 

[Adam Edge]

No problem, the caps are something always worth checking anyway. It is unusual for them to fail on a VP board though, I see this only occasionally, but worth giving a go. If you do decide to change them, be very careful desoldering them as it can lift the pads !

have you ever fixed no power issue? what did you have to replace?

 

[damonCA21]

Yes have repaired a few. It can be lots of things that cause it so depends on the board