Mic Pre blown up?

[beachy]

we were "playing back" tracks and using the Mic Pre( line level of course) to add slight gain ( no more than 12 db ) for a bit of Volume a bump to the snare..
Almost immediately we heard a slight Blip-pop and the Volume of said track was dropped to near 0 db ..
With fader at top of travel( = +6) the volume of the snare is/was ONLY slightly audible..
on said track currently the following is exhibited..'
Using Line In as return from recorder only Slight volume at Channels MAX fader travel.
when using a MIC and setting PRE to MIC..pre fully cranked has 25 DB output and is distorted..all other channels etc. are operational-status Quo
has anybody experienced this symptom with the DM 4800..and if a Blown Pre..any experience in swapping the IC out

thanks in advance

r.k.r

 

[berl]

I have this problem on my 4800, first on channels 23 & 24, and recently on channel 21. I thought it was the flat cable or connectors between the cards as sometimes it works well, and sometimes not... The mixer is open, not yet repaired.

 

[Guitarbin]

I have the same problem on channels 2 & 15. Is there anyone that had the opportunity to fix the pre's on the Tascam DM-3200 or DM4800?

 

[beachy]

Thanks for the reply ..after several Test's to confirm the problem was in fact the Pre we discovered that the INSERT jack had a cold solder and was creating the problem .
By removing all 1/4 jacks out of the signal path ( in this case the Insert Jack) and then INSERTING one at a time a Signal( keyboard) into the channel we located the problem and now is fixed..

 

[berl]

Thanks for the info and the tip.
I will check that on mine.

 

[berl]

Superb !
All my chanel are OK now : I cleaned ALL the insert jacks with a contact cleaner (Kontakt60) from outside.
Thanks a lot for sharing this info.