I stupidly moved my laser printer with me overseas without checking whether it would take 220V. I assumed it would be like my desktop computer and accept both.

Anyway, here I am with a 110V printer in a 220V country. The label says 110V 50/60Hz.

I've opened the printer to look at the power supply, and I also found the service manual.

On the board, there is a 250V fuse, a 125V fuse, and a smaller fuse. According to the schematics, the AC input first goes through the 250V F1 fuse, then the 125V F2 fuse, then the smaller one (F3).

There is also a somewhat large capacitor that says 200V 270uF.

Do you think it's possible this power supply would accept 220V without modification, but it's not labeled as such for whatever reason? I think Sony did that on the PlayStation for instance to try and curb the grey market.

Here are pictures of the board, and the service manual.

service manual (relevant pages: 165, 167, 168)

board fuses capacitor schematic 1 schematic 2


closed as off-topic by Elliot Alderson, Marcus Müller, Dave Tweed Oct 8 at 19:41

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  • 3
    \$\begingroup\$ The type label says 110V, and the components are clearly only fit for 110V. No way this thing is doing more than burning down on 220V. \$\endgroup\$ – Janka Oct 8 at 19:00
  • 2
    \$\begingroup\$ the fact that this printer even comes with a service manual with a schematic might indicate it's a high-quality device and it might financially make sense to buy a 110V->220V transformer. They're not that expensive. \$\endgroup\$ – Marcus Müller Oct 8 at 19:15
  • \$\begingroup\$ oh, nevermind, that is a small office/consumer laser printer that's 9 years old. Go on ebay and buy a similar used model. Cheaper. If you need to make some money, sell the remainder of your toner cartridge. \$\endgroup\$ – Marcus Müller Oct 8 at 19:16
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    \$\begingroup\$ The big capacitor is rated for 200V. It will explode when 220Vac is applied. If it was universal mains, the capacitor would have been rated 450V or higher. \$\endgroup\$ – Huisman Oct 8 at 19:18
  • \$\begingroup\$ Sadly, no. The large capacitor is the one shown at far left bottom in the diagram. It is rated at 200 VDC. Rectifying AC give VDC of ~= 1.4 x VAC so at 110 VAC you get about 15V VDC. Apply mains at double that voltage and you get VDC well above cap rating. Instant death,. This is an indicator that the rest of the cicruit will also not tolerate 230 VAC mains. You can buy 110:230 VAC transformers. You need an appropriate wattage rating. For interest - where have you moved from - to? \$\endgroup\$ – Russell McMahon Oct 8 at 19:53

Simple answer: NO.

There is also a somewhat large capacitor that says 200V 270uF.

The capacitor is for 200V, which is sufficient for a fully rectified ~120V. ~230-240 would burn it with its 340DC. ~230-240V tend to use 400V capacitors.

I don't quite understand the triac part and it does requires AC to function. I suppose it's a heating element and in such a case, you cannot use 240V w/o a transformer. Otherwise, not recommended but if it's a low powered switch power supply, you can cut half of the wave of 230-240V via a single diode and feed DC to the full wave rectifier. Again not recommended and relatively dangerous.


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