My Toshiba HX-10 gets mighty hot!

Thanks for the warning sd_snatcher

I may have wasted £3 on fakes...

What about this one: http://www.ebay.co.uk/itm/Zilog-z80-CPU-4-MHz-Z84C00-04PEC/1...

I'm no expect either, but they look genuine enough

If it is way too cheap, you should get suspicious, you know.

BTW, why would anyone living in the 1st world take risks to buy it expensive on eBay?

The Z84C0004 is phased out for quite some time now, but the Z84C0006PEG is a perfect replacement that's still on production. You can buy them at your own country, at very decent prices from real distributors like: Digikey, Mouser, Future Electronics, Shukat or Farnell. They cost around $5 in the US, €4,55 in the Eurozone and £4 on UK. Usually the stores have huge stocks of this part, as it was used as the CPU of a lot of embedded systems, i.e. elevator controllers.

Farnell seems to have the Z84C0010PEG at an excellent price: £3.17.

Yesterday, I found the thermal probe. So I took the temperature of the HX-10 with the CF interface Sunrise and the MMM cartrige inserted.

First, the temperature was 16°C. It's normal, It's not hot here.

Then, after several dozen minutes of play (with SG-1000 games). The temperature has risen to 84.4°C. Temperature for the transistor A473 was around 72°C and around 76°C for the B880 (with a heatsink for SDRAM attached to each).

Now, that's for sure. We have to modify the HX-10 if we want to put two cartridges. I think it is also the case for several MSX1.

Conclusion:

1. A Z80 CMOS seems to be an interesting solution. Check the consumption because not all are low consumption.
2. Capacitors (2200μF 35V and 4700μF 16V) at 105°C are required.
3. We do not need to replace the transistors but We need to put a heatsink on all three.
4. I do not think the fan is a good solution. There's no room. And even if it were possible, It will blow heat off the other components.

Nice! How about the transformer temperature? The 100V version runs pretty hot, but I don't know about the 220V version.

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Isn't there enough room in the HX-10? Because in the HX-2x and HX-3x models there is. Tomorrow I'll post a picture of my
Machines. But I think that Jurczyk was able to fit a fan in his Japanese HX-10. But the European model seems to be a bit different.

If I may suggest, I would replace the two small heat sinks with ones specific for the TO-220 format. Those have winglets that go to the front side, drawing heat away from the capacitors. Your SDRAM heat sinks are irradiating heat directly on the capacitors.

I took a picture from another angle. You can see that the capacitors are farther from SDRAM heat sinks than from the B435. It is not them who will cause problem if we replace the capacitors.

PS: The size of the big heatsink is 38 x 18 x 30 (WxTxH) and can be 38 x 26 x 30 max.