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Post by randomaudioguy on May 16, 2024 20:13:56 GMT -5
Hi everyone, I want to change a Pioneer LX305 from 110V to 220V The transformer is a NPT-1672D. As I understand it I can swap that with a NPT-1672M for 220V. That's easy. My question is the board (I believe it's the SMPS) numbered BCPS-2572. Does that board need to be changed? Or can it work with both 110V and 220V? TIA  |
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Post by tibimakai on May 17, 2024 10:01:17 GMT -5
There is nothing about this difference in the service manual?
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Post by andyb1712 on May 19, 2024 5:29:50 GMT -5
I converted a US Pioneer VSX-53 to UK voltage using a main transformer from a scrap SC-2022 and it worked. The primary/standby switch mode supply is designed to be worldwide voltage range and just has a different main fuse fitted. I think it was a 12A for US and 6.3A for UK but that was the only difference I found.
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Post by randomaudioguy on May 19, 2024 18:19:13 GMT -5
There is nothing about this difference in the service manual? I don't have the service manual for this model (LX305). I have seen other Onkyo service manuals, and assuming they are similar (they look similar), but I don't have the skills to look at other models (like Onkyo NR676) to know if the board needs to be changed or not. I have asked something similar on this board about the power conversion for the Onkyo NR676, and someone mentioned needing to change a capacitor. However I never got a d definitive answer. |
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Post by pioneerav on Sept 5, 2024 11:23:25 GMT -5
Hi randomaudioguy Did you manage to do the conversion? I am interested in this because I want to do the conversion on a Pioneer LX305 too. |
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Post by randomaudioguy on Sept 8, 2024 18:17:26 GMT -5
Hi randomaudioguy Did you manage to do the conversion? I am interested in this because I want to do the conversion on a Pioneer LX305 too. Yes I did. I found the right 220V version of the transformer and replaced it. The SMPS board does not need to be changed, it works fine. Just change the fuse to the right one. Normally half the value. From memory I changed the 10A to a 5A. |
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Post by pioneerav on Sept 9, 2024 11:14:14 GMT -5
Nice, that's fantastic.
What was the exact part number of the transformer you replaced with? (Also where can I buy online). Lastly, I had assumed transformer has two primary windings and could thus be prodded into doing 220V with a bit of soldering,by wiring them in series instead of parallel. Would this have been possible at all?
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Post by randomaudioguy on Sept 9, 2024 18:35:11 GMT -5
Nice, that's fantastic. What was the exact part number of the transformer you replaced with? (Also where can I buy online). Lastly, I had assumed transformer has two primary windings and could thus be prodded into doing 220V with a bit of soldering,by wiring them in series instead of parallel. Would this have been possible at all? The part number is the same as the original NPT-1672D but with an 'M' NPT-1672M. I don't believe you can change the primary windings from 110v to 220v, which was why I needed to change the transformers. At least there's no easy way I could find. Unfortunately I've not seen them for sale, and if I did, I think it would be expensive. I pulled the transformer from another amp. This uses the same power supply as the Onkyo NR757, NR787, RZ710, RZ720, and Integra DRX4, DRX4.1, and DRX4.2. |
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Post by pioneerav on Sept 10, 2024 2:31:03 GMT -5
I see. Best thing for me in this case is to just go for a voltage step down transformer. Thanks a lot!
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Post by serafis on Sept 29, 2024 3:43:42 GMT -5
If you do decide to do the conversion, I'd also check the voltage spec of the big electrolytic capacitor across the mains on the SMPS board, next to the fuse - for 220V mains I'd expect it to be marked around 400-450V. Not sure for 110V. Good luck!
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