OK it is possible he sold you a bad board then and that is why he was breaking it
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Need Help Roland Sp540v Servo board replace
- Thread starter Ziyaad
- Start date
Ah ok the other thing it could be is the relay has failed on the heater power board. You need to test CN101 and CN106 on it ( these are the ones that lead from the board to the fans ) . Set the meter to DC volts and put one probe on each of the pins on those connectors and see if you get a voltage reading
Ziyaad
New Member
No I haven't, Do I need to disconnect the connector 1st?
Jim Hancock
Old School Technician
Ziyaad messaged me about an old thread I posted about a fix I implemented on an SP-540 where the platen fans never turned off.
Based on a suggestion from a local tech in his area, this is a possible workaround. He has obtained a power supply for the fans themselves.
The fans can be hooked up directly to the power supply and it can be turned on and off, or it can be left on and have the output run through a toggle switch. Locate the wires that connect to the vacuum fans on the heater power board, as Damon said, it should be CN101 & CN106. Unplug these cable and cut the connector off, but leave 2 inches of wire with the connector in case you need to re-attach the connector for some reason. Take the 2 wires from each cable that go to the fans, likely a red and black wire, and either hook them to your power supply or to your toggle switch. The toggle switch needs to be a double pole switch so you can hook both sets of wires to the switch, reds together and blacks together, with 2 additional wires going from the switch to the power supply, maintaining the polarity. Just be sure the power supply is the correct voltage for the fans and you only need one power supply to run both fans.
Based on a suggestion from a local tech in his area, this is a possible workaround. He has obtained a power supply for the fans themselves.
The fans can be hooked up directly to the power supply and it can be turned on and off, or it can be left on and have the output run through a toggle switch. Locate the wires that connect to the vacuum fans on the heater power board, as Damon said, it should be CN101 & CN106. Unplug these cable and cut the connector off, but leave 2 inches of wire with the connector in case you need to re-attach the connector for some reason. Take the 2 wires from each cable that go to the fans, likely a red and black wire, and either hook them to your power supply or to your toggle switch. The toggle switch needs to be a double pole switch so you can hook both sets of wires to the switch, reds together and blacks together, with 2 additional wires going from the switch to the power supply, maintaining the polarity. Just be sure the power supply is the correct voltage for the fans and you only need one power supply to run both fans.
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Jim Hancock
Old School Technician
That will work! Plenty of juice to drive both fans from the one supply...
AND if you go to a good HVAC industry site, you can get a fixed temperature thermister to turn the fans on& off. I will post a link, I purchased a few to keep a warehouse section warm, during thevwintr
Yep power supply will be fine for those. If you are going to be running the fans all day I would personally get a couple of those supplies and run one fan off each just so they aren't pushed as hard and they will last longer