short form:
This portable CD player doesn't recognize data- (mp3-) discs. It does play audio discs so I don't know why it has trouble with data discs
long form:
This portable CD player seems to have received a hard shock like falling to the floor. When I put it out of the, well, scrap box, one hinge was broken and it didn't recognize any CDs.
Following the steps in repairfaq.org ("startup problems") I found out that focus was established ok but there was a tracking problem. After taking off the shielding from the pickup i noticed that the hair-thick wire from the tracking coil was broken. Fortunately I could establish a drop of solder joining the two ends of wire again.
Now the device plays CDDA-discs quite well but only if I turn off ASP (anti shock protection): When ASP is on the disc spins up to double speed and music is played in double speed (just as in fast forward seeking mode). A bargraph is drawn on the display that starts getting "full". When "full" level is achieved, disc slows down to 1x but it doesn't play out of the buffer (slowing down the disc "manually" immediately has effect in autio output) and sound is "scratchy". This seems rather weird because other functions do work quite normal...
When I insert a mp3 disc startup sequence is as follows:
- establish focus (lens moves up, down, up again and starts to wobble with the disc)
- spin up
- move head out of the innermost position (maybe searching for TOC?) with some very short breaks in between
- move back to start
- re-establish focus once again
- do the same move-steppy-out-of-center
- disk keeps on spinning, head isn't moved any more; display still says "Reading compact disc" and nothing more happens.
Watching the eye-pattern gives no clue. It looks pretty normal and especially it looks the same for cdda and mp3-discs.
question section:
- is there anything I could check or adjust? There is just one potentiometer located on the pickup (don't know what it is for so I didn't touch it up to now)
- what do you think about the ASP-problem? Why is just ASP faulty (I mean ASP ist just one of tousands of features in the chipset, if the chip was dead nothing would work).
- Could be there a connection with not reading data discs? (i wonder...)
thank you very much for any comments and tips!
kind regards, Harald Kleiner