Hello Forum
I have acquired a Roland D20 Keyboard which has a 110v Mains supply requirement. (USA I think) On closer examination of the internal Transformer itself, The Transformer Primary input terminals read 110v - 240v - 0v . At the moment the mains cable is using the 110v and 0v tabs, and nothing is connected to the 240 tab.
Would it be realistic to move the 110v input cable connection to the 240v input connection, to accommodate UK Voltage. (I have a step down transformer, at the moment.)
thanks in advance.
Mike
Roland D20 Mains Transformer Question.
Roland D20 Mains Transformer Question.
mdsc
Re: Roland D20 Mains Transformer Question.
Yep.
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- resistorman
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"The Best" piece of gear is subjective.
Re: Roland D20 Mains Transformer Question.
The service notes can be found at
https://www.synthxl.com/wp-content/uplo ... -Notes.pdf
It would appear that you can just rewire the transformer but there are a couple of other differences between the 117V version and the 240V version - namely the input fuse rating and the use of a three core mains cable instead of a 2 core cable. Also check that C1 on the fuse board is suitably rated.
https://www.synthxl.com/wp-content/uplo ... -Notes.pdf
It would appear that you can just rewire the transformer but there are a couple of other differences between the 117V version and the 240V version - namely the input fuse rating and the use of a three core mains cable instead of a 2 core cable. Also check that C1 on the fuse board is suitably rated.
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- James Perrett
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Re: Roland D20 Mains Transformer Question.
Thanks James will look into that
mdsc
Re: Roland D20 Mains Transformer Question.
Bear in mind that any 'mains side' work done must be get a PAT certificate if you ever intend to sell any such gear or even give it away. I would get it tested anyway.
James. I have downloaded that manual but I am jiggered if I can see a schematic or anything related to a mains input? And.
O...M....G! If any of those ICs fails? Game over? Be VERY careful about static precautions OP.
Dave.
James. I have downloaded that manual but I am jiggered if I can see a schematic or anything related to a mains input? And.
O...M....G! If any of those ICs fails? Game over? Be VERY careful about static precautions OP.
Dave.
Re: Roland D20 Mains Transformer Question.
It is in the bottom right corner of one of the big circuit diagrams. You need to zoom in quite a bit but at least it is a decent scan so the component numbers are clear.
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- James Perrett
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- Hugh Robjohns
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(But generally posting my own personal views and not necessarily those of SOS, the company or the magazine!)
In my world, things get less strange when I read the manual...
(But generally posting my own personal views and not necessarily those of SOS, the company or the magazine!)
In my world, things get less strange when I read the manual...
Re: Roland D20 Mains Transformer Question.
I understand why there are different fuse board versions for the various mains voltage options (different fuse value and capacitor voltage ratings for a start), but I'm confused as to why there are different versions of the low-voltage power supply board, and what the differences might be.
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- Hugh Robjohns
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Posts: 42827 Joined: Fri Jul 25, 2003 12:00 am
Location: Worcestershire, UK
Contact:
Technical Editor, Sound On Sound...
(But generally posting my own personal views and not necessarily those of SOS, the company or the magazine!)
In my world, things get less strange when I read the manual...
(But generally posting my own personal views and not necessarily those of SOS, the company or the magazine!)
In my world, things get less strange when I read the manual...
Re: Roland D20 Mains Transformer Question.
Hugh Robjohns wrote: ↑Mon Nov 14, 2022 2:57 pm I understand why there are different fuse board versions for the various mains voltage options (different fuse value and capacitor voltage ratings for a start), but I'm confused as to why there are different versions of the low-voltage power supply board, and what the differences might be.
Are you referring to the note about fitting a heat sink to a bridge rectifier for the low voltage version Hugh? If so it might be because many areas of "115V land" have very wide supply voltage tolerances (Mexico comes to mind) and thus the rating of the component might be marginal for maximum mains V. IMHO they would have been better to fit a rectifier of double the likely supply demand. They are not exactly a fortune!
Of course, this is all just me guessing.
Dave.
Re: Roland D20 Mains Transformer Question.
The PCB fuseboard layout shown above the schematic on Page 20 seems to indicate that it also contains an inductor L1 and an additional capacitor C2. So maybe there's more to the different fuseboard designs than shown on the schematic?
Reliably fallible.