Help! Yamaha CDX-993 problem.

[Pete22]

Hello everyone. This is my first post here and it feels good to finally gotten around to join in after a year or two of lurking in the shadows.

I have a CDX-993 that won´t read disc´s. I changed the laser thinking that was the problem but the problem stayed. It tries to read the disc and every fifteenth attempt or so it succeed´s and the disc´s information can be seen in the window. Then if you try to press play nothing happens though.

I was looking forward to start tweaking this thing so if anyone has any idea´s it would be very much appreciated...

Peter
Sweden

[Pete22]

Please help...

[Netlist]

I do have some info on other CDX9XX models like the 910, 920, 930...
You should however first try to determine if these are similar machines otherwise the info will be useless.

/Hugo

[Cobra2]

CD-platter-motor?
Did you change laser only or the whole "KSS" -mecanism?

Arne K

[hjelm]

Check all connectors between board and moving parts. Also read the RF signal with a scope if you have one.
Does the lens collide with the disc, had a yamaha that did that, this would indicate focus problems, my focus drive had major problems didnt't fix it though. Does it spin the disc properly?

[Pete22]

Hello again

Yes, i changed the whole "kss" mechanism and not just the laser. The disc spins like it should too. I don´t have a repairmanual for the model otherwise i probably could figure out where to find the rf-signal with a scope.

It would feel terrible to scrap it but i don´t know what more i can do with it.
I honestly don´t have a clue where to look next...

[Cobra2]

http://www.schaltungsdienst.de/gb/abfrage_sql_gb.php

Player is worth fixing...or I will buy it!

Arne K

[hjelm]

Dont know if this helps any.
On an old cdx 520 there was a pin labled EFMI which i think was the signal from the laser after a gain stage. The signal was read between that pin and a pin labled G, four pins in this group where you could connect measuring equipment.

In the cdx 520 it was 2V PP and it should make a nice eye pattern if you pressed play.

Edit: And i also recomment Schaltungsdienst if you cannot find the manual anywhere else.

[mat_cauthon]

Hello to everyone, too.

This is actually also my first post posting.
I do own the cdx 993 myself and fear, I´ll have a problem with it myself.
After working fine for months, it now (sometimes) starts to "jump" over the disc (moving fast forward), mostly at the beginning of the disc.
Could this be the laser-unit?
@cobra2 you said a few times, it uses a common sony laser. would you be so kind and tell me wich oone it is, so I can order it (just in case...).
@pete I do have the technical manual for the 993...

Nils
Germany

[Cobra2]

Originally posted by mat_cauthon


@pete I do have the technical manual for the 993...

Nils
Germany

And there you will read: KSS-213C


Arne K