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NFG Forums => SIG X68000 => Topic started by: silius on January 24, 2012, 07:29:50 PM

Title: Anybody have problem with FM audio in compact xvi
Post by: silius on January 24, 2012, 07:29:50 PM
Hi everybody,

Well this is my first message here, this forum is fantastic.

Well  I have a Sharp compact x68000 Redzone and I have a problem with  fm audio I change all the capacitors smd of the pcb, but I have the same problem I hear the sound very low  and distorted in my Sharp if I put the headphones until the end I don't listen nothing I must to put the connection of the headphones in the middle more and less to listen something.

I would like if anybody have the some problem and if is posible to resolve.

I have conection by midi too, and the sound is better but i think i listening better in my sharp XVI

Thanks a lot

Excuse me for my English
Title: Re: Anybody have problem with FM audio in compact xvi
Post by: SuperDeadite on January 24, 2012, 10:04:32 PM
Replace the Op-Amps.  In the Compacts they fail 95% of the time.
Title: Re: Anybody have problem with FM audio in compact xvi
Post by: eidis on January 25, 2012, 12:30:05 AM
 Hi Silius and welcome to our forum !

This thread might come in handy:
http://nfggames.com/forum2/index.php?topic=4728.0 (http://nfggames.com/forum2/index.php?topic=4728.0)

Best of luck and please post info on your progress.

Eidis
Title: Re: Anybody have problem with FM audio in compact xvi
Post by: RobIvy64 on January 25, 2012, 02:08:46 AM
I never did figure out what was wrong with my system. I sold it to a local guy who is going to take a crack at repairing it.

I suspect one or more transistors have failed.
Title: Re: Anybody have problem with FM audio in compact xvi
Post by: silius on January 25, 2012, 03:00:36 AM
Frist of all, thanks to replay.

Well I try to change the op-amps and  inform in forum the progres.

Thanks a lot  to try help me

I look to buy the op amps.

Please could you tell me if this op- amps is correct to change

http://es.rs-online.com/web/p/amplificadores-operacionales/6610644/ (http://es.rs-online.com/web/p/amplificadores-operacionales/6610644/)

Thanks a lot
Title: Re: Anybody have problem with FM audio in compact xvi
Post by: eidis on January 26, 2012, 04:40:53 PM
IMHO it should be fine as long as MC3403 is mentioned in the part number. Please someone correct me if I am wrong.

Eidis
Title: Re: Anybody have problem with FM audio in compact xvi
Post by: lydux on January 26, 2012, 11:02:36 PM
That's a regular quad opamp in SMD SO14 package. Original is a MC3403, compatible device are TL074 or LM324