Sega CD systems repair thread

[Xalphenos]

Kenzya is your new new laser made in China or Japan? It's been said that the newer replacement lasers are made in China and of lower quality. Consequently some of them have lots of problems playing backups.

[Arnold101]

i have a sega cd model1 jap, tried with game and audio cd, read it 2 seconds circa and then cdout...is the KSS-240A lens to change right?
also if i want to regulate the lens there are 3 trimmers, what to they do and what i have to touch?
thanks

someone can reply to me too? thanks...

mega cd1 japan have the kss-240a laser? and how must be trimmed to read cdr? there's a guide here?

[Xalphenos]

someone can reply to me too? thanks...

mega cd1 japan have the kss-240a laser? and how must be trimmed to read cdr? there's a guide here?

Model 1 can have two different lasers. You must open up the unit to find out. No clue about tweaking the pots to read cdr's.

[Arnold101]

Model 1 can have two different lasers. You must open up the unit to find out. No clue about tweaking the pots to read cdr's.

ok i let you know and what pot i have to move?

[kenzya]

Oddly enough, I turn my sega-cd on after a couple weeks of not touching it and it refuses to spin up CD's again.

Kenzya is your new new laser made in China or Japan? It's been said that the newer replacement lasers are made in China and of lower quality. Consequently some of them have lots of problems playing backups.

I'm not sure of this but if I had to take a guess I would say they were probably made in China since I just bought them off of ebay. Would explain a lot I suppose.

[segasonicfan]

Got a CDX that keep resetting itself randomly. Driving me nuts. Changed EVERY cap inside there, tried different power board and no dice. Sometimes it does it after 1 hour, sometimes after 3 hours. :/

[MEGADRIVE Jeroi]

Got a CDX that keep resetting itself randomly. Driving me nuts. Changed EVERY cap inside there, tried different power board and no dice. Sometimes it does it after 1 hour, sometimes after 3 hours. :/

Reflow power board connector pins. it may have cold joint that sometimes cuts power off. Just a guess but you could check this cost no money.

[Segadream]

Reflow power board connector pins. it may have cold joint that sometimes cuts power off. Just a guess but you could check this cost no money.

If that fails don't put it together just yet.
You want a meter and test continuity.
Use a hair blow dryer or let it play till it shut off to "warm" the board up a little.
Check it while its warm to see where the circuit is not making contact.
You may want to check first while its "cold", then again while its "warm".
Its the only way I know of to diagnose these types of power issues other than going through the whole
board's components and finding the malfunctioning part.

[segasonicfan]

Reflow power board connector pins. it may have cold joint that sometimes cuts power off. Just a guess but you could check this cost no money.

Thanks, I'll try this. Such an odd issue, it definitely seems to happen mostly when the system is warm. What's weird is that it seems to happen only when the cartridge board is plugged into the CD board - even if its only playing a cartridge game. I ran the cartridge board by itself for 6 hours and it was fine.

so I'm thinking a) power draw is too much with them both connected (due to bad solder joint i guess) or
b) there is a something briefly shorting a power rail on the CD board after is warms up (not sure what)

I appreciate your help.

-Segasonicfan

[boom10ful]

Hello everyone,

Does anyone happen to have a Sega CD disc drive and front faceplate?

[FuturePrimitive]

Hello everyone,

Does anyone happen to have a Sega CD disc drive and front faceplate?

This is a repair thread, not a wanted/for sale classifieds section. You already made your first post in the Bazaar.

[boom10ful]

This is a repair thread, not a wanted/for sale classifieds section. You already made your first post in the Bazaar. You keep this up, you will be reported to the moderators and administrator.

Sorry, didn't know you couldn't post here.

[aaronmjr]

[Arnold101]

please help. i got a mega cd japan its a kss240A drive not read any cd but it spin. it have the 3 orange pots, there's only 3 right? how i have to pot them and what is theri function?

thanks a lot and help me

[segasonicfan]

Thanks, I'll try this. Such an odd issue, it definitely seems to happen mostly when the system is warm. What's weird is that it seems to happen only when the cartridge board is plugged into the CD board - even if its only playing a cartridge game. I ran the cartridge board by itself for 6 hours and it was fine.

so I'm thinking a) power draw is too much with them both connected (due to bad solder joint i guess) or
b) there is a something briefly shorting a power rail on the CD board after is warms up (not sure what)

I appreciate your help.

-Segasonicfan

Fixed! So I wish I could say I did something really special. I actually had an extra top board laying around from another broken unit. I swapped the boards and crossed my fingers and....it worked! Ran the console all night long and no more resetting issue

So the resetting issue was not the CD board or the power supply, it was something on that top board. I replaced the main caps but maybe it needed a power reflow or some more caps replaced. *shrug*