Mz-r700 Phones Out Defect

[Dr.med.Lecter]

hi all,

this is my first post here, search didn't help.

i purchased a sony mz-r700 4 years ago and for 3 years it did work fine.

10 months ago the phones out jacket seemed to get a loose contact.

both channels are cancelled now, by pressing the phones plug very hard at the side sometimes the sound comes back. this became steadiliy harder as time went by.

some weeks ago i opened the unit and checked out that there ist no problem with the jack itself but with the amp. because every time both channels are cancelled, i presumed a problem with ground pin. no way, the jack is having ground shurely as well as the left and right pin.

can anyone help?

sony service is too expensive for this old unit and would take too long.

thanks in advance

dr.med.lecter

(from germany)

[Turbo7MN]

This is quite common on the R700. Mine started doing it, so I crammed a 4-layer wedge of paper between the case and the headphone jack. I't's been working a lot better ever since.

[dex Otaku]

This is likely a simple mechanical failure. It's highly unlikely that there's anything wrong with the amp.

Usually this happens because headphone jack's solder becomes detached from the logic board from stress through repeated use.

Other possibilities are that the logic board may have nearly-invisible stress cracks on it for the same reason, or that the pins inside the headphone jack are simply bent to the point that they no matter make full contact with the connector when it's inserted.

It's also possible that the pins may just be dirty or corroded, but if you're getting a "cancellation" effect, this is usually from physical damage between the jack's pins and the logic board.

The only actual solution to this is to replace either the headphone jack or the entire logic board inside the unit, depending on the extent of damage.