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Marantz PM4400 - Change 230V to 115V
Marantz PM4400 - Change 230V to 115V
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Old 25th October 2015, 10:01 PM   #1
retrography is offline retrography  Canada
diyAudio Member
Join Date: Apr 2014
Default Marantz PM4400 - Change 230V to 115V

I have a Marantz PM4400 bought in Europe, and I have been using it here in Canada for about 3 years now, without ever doubting that the amp might not be bi-volt. Turns out it is not. Today I opened the amp to see why one of the speaker relays had stopped functioning, and to my great surprise I noticed that all the wiring inside has been done for 230V. I wonder how this poor thing has not failed by now...

Now that I have already opened up the hood, I would like to know what it takes to change the voltage of the amp from 230 to 115.

Looking at the service manual (pp. 6-7), I have the impression that the whole mains circuit has been designed for bi-voltage usage, and there might be only some rewiring involved.

There are two transformers: TRS1 and PWR1. Both look like they have multiple inputs. In case of TRS1 (which is an EI-35), even the service manual says it can operate at 115/230. For the main power supply (PWR1 / PM-48), though, there is no mention of the operating voltage. A cursory look at the transformer itself shows me that the transformer has a third input leg that is actually soldered on the PCB where the label says 115V. It is just that the parts of the circuit that are specific to 115V voltage, are not connected (JW94, F902, JW98, J305, J308), while the ones that are specific to 230V are all connected.

Is it possible that whole system can be rewired as 115 with no component change? Or am I missing something? Apparently there are cases on this forum where people have succeeded doing that with other components. It'd would be great to have some guidance on the rewiring.
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