XC-540 Heater won't turn off. Help!

[KT.]

Hi, I've just noticed that the heater under the print platen on my XC-540 is permanently ON even when the secondary power is turned off. The machine is printing normally and the pre-heater and post-heater are operating normally. I would be very grateful of any advice please. I have contacted Roland support (in the UK) and they have suggested it may be the Heater Control Board but I'm not sure how to access it?
Thanks,
Kieran.

 

[Joe House]

Hey Kieran,

The heater control board is under the front apron. You could have a stuck solenoid on that board.

Good luck and stay safe,
Joe

 

[KT.]

Hi Joe,
Got it sorted thankfully, you are correct - it was a faulty Solid State Relay (SSD) on the Heater Control Board which was permanently ON (under the front apron as you described). There are 3 SSD's on the Heater Control Board, I swapped the post-print heater with the print heater cables and the fault moved to the other heater so I was confident that this is where the fault was coming from. I was quoted £300 (approx $370 dollars) for a new board but I decided to do some surgery on it instead and just ordered a replacement Solid State Relay (ref: Sharp s202se2) component from an electronics store online which cost me £17 plus delivery. I removed the faulty SSD from the circuit board with desoldering tool today and soldered in the new one. It works again . Not sure if this is of any help to anyone but I've uploaded a couple of photos to show the board etc, it's a relatively straightforward fix and a whole lot cheaper too! Thank you for your reply to my original post, it is a great forum and lots to learn from everyone
Best regards,
Kieran.