My Burmester 870 DAC MK2 blown up. DAC chip have no marking.
Pls., advice what is it can be. Digital filter on board is SAA 7220/B.
Thanks!
Pls., advice what is it can be. Digital filter on board is SAA 7220/B.
Thanks!
You will need to follow the traces and do some reverse engineering since I have my doubts that Burmester will show you the schematics. I know, it is a terrible thing to do but some companies are like this. They sell very expensive gear which is built with common parts and after you´re out of warranty, you have 3 options: 1) try to repair the gear 2) throw it in the bin or 3) sell it on ebay..
Best regards,
Best regards,
SAA7220 is designed to feed TDA1541 so that would be my initial guess for the chip used. How many pins is it and what style package?
Well, I just needs DAC chip model. It looks like PCM53 or 54. May be TDA 1541А.
I will try repair, but must be sure, that chip is correct. Will try ask Burmester.
I will try repair, but must be sure, that chip is correct. Will try ask Burmester.
Very, very unlikely to be PCM53 or PCM54 - both those have parallel interfaces whereas SAA7220 spits out I2S.
It generally looks like TDA 1541, but have 2x12 pins. I don't know way to add photos here.
Attachments
Hard to say, simply from looking at a photo. However, I do note the many glue logic chips, of which, there appear to be 74LS174 hex flip-flops. I suppose those might be utilized for PCM53 serial to parallel conversion. Doesn't appear to be a TDA1541 DACs, as I don't spot the usual array of 100nF de-coupling capacitors.
With only 24pins its definitely not TDA1541(A) nor TDA1540 and with all those logic chips it does look extremely likely that they're doing serial-parallel (74LS164 shift regs at the top) then time-interleaving (the 20pin chips are 74LS374 8 bit latches) to an array of PCM52 or -53s.