Author Topic: Sega Mega CD II repair  (Read 1273 times)

Offline JoeMusashi

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Sega Mega CD II repair
« on: September 27, 2014, 23:56:27 PM »
So, I've got a Mega CD II I'm trying to repair. It just doesn't power up.

After inspection I found a blown internal fuse (quite common I understand) but also a dodgy 5v regulator (spitting out 6v) and also a blown darlington transistor (switches power to regulator with vcc feed from Mega Drive edge connector).

I've replaced the fuse and regulator but I'm struggling to find an alternative transistor. I think it's Q301 and the device is 2BS963 iirc (ill edit when I've checked...)

Hopefully, when I replace this, the machine will be up and running again.

Does anyone else have experience of Mega CD II faults?

Offline retromod

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Re: Sega Mega CD II repair
« Reply #1 on: September 28, 2014, 00:20:42 AM »
sure, in 99% the fuse is blown. Replace them with one of the newer types (there are new types which disables but are fine again after loss of power) - do not remember the name of this type of fuse but very helpful.

Most likely due to the fact that someone used the wrong power supply from mega drive I instead of II.
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Offline JoeMusashi

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Re: Sega Mega CD II repair
« Reply #2 on: September 28, 2014, 00:39:13 AM »
I think you mean resettable fuses. Yes, thinking about it, that would be a good idea! I have replaced like for like.
Hopefully, replacing these components will bring it back to life but I've had these feelings of false optimism before. Knowing my luck the fault will be buried deep within the system. Probably something very uncommon  >:(

Offline onthinice

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Re: Sega Mega CD II repair
« Reply #3 on: September 30, 2014, 15:47:31 PM »
I have the Sega CD II. Bought it new back in late 1993 or early 1994. Never had any problems. I always thought it was a very durable system. So sorry I can't help.

Wish you best in finding the answer!

 

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