diyAudio Forums Archive > Top > Source > Digital Marantz cd 273 schematic. - Click HERE for Original Thread Katapum Hi I have Marantz cd 273 and I´d to upgrade it. Does somebody have the Schematic? Dac chip is a TDA1541 without A and without 14 decoupling caps. Should I add decoupling caps to TDA1541. Thanks Katapum quote: Originally posted by Katapum Hi I have Marantz cd 273 and I´d to upgrade it. Does somebody have the Schematic? Dac chip is a TDA1541 without A and without 14 decoupling caps. Should I add decoupling caps to TDA1541. Thanks :spin: musicomputer The caps will be surface mounted on the other side of the pcb to the TDA1541. Katapum quote: Originally posted by musicomputer The caps will be surface mounted on the other side of the pcb to the TDA1541. :scratch: It’s an old cdp. musicomputer quote: Originally posted by Katapum :scratch: It’s an old cdp. Take the circuit board out and look on the other side - the decoupling caps will be there! :D Katapum quote: Originally posted by musicomputer Take the circuit board out and look on the other side - the decoupling caps will be there! :D You are right :) How to upgrade my cdp without a schematic? Has Philips an equivalent Marantz 273 model? PS: many time ago I made a NOS mod. Katapum quote: Originally posted by Katapum How to upgrade my cdp without a schematic? Has Philips an equivalent Marantz 273 model? :smash: poynton Hi. Philips CD160 is similar Andy Katapum Thanks Andy. Question? Is it true? Or TDA1541 (without A) has internal pins 16 and 17 connected by a cap? poynton quote: Originally posted by Katapum Thanks Andy. Question? Is it true? Or TDA1541 (without A) has internal pins 16 and 17 connected by a cap? The TDA1541 and TDA1541A are not identical and cannot be substituted. (as the post refered to says) I have a CD273 SE with a TDA1541 S !! Andy Katapum quote: Originally posted by poynton I have a CD273 SE with a TDA1541 S !! Andy What you have done to your CD273? poynton Here is a copy of the CD160 manual. The circuit is similar to the CD273. http://www.yourfilelink.com/get.php?fid=358370 Andy Katapum Thanks i saw it. Philips cd160 seems a little better than Marantz cd273. In cd273 PCB missed some parts from cd160 schematic. quote: Originally posted by poynton The TDA1541 and TDA1541A are not identical and cannot be substituted. (as the post refered to says) I´d like to build a good OS CDP but seems I can´t replace TDA1541 by a TDA1541A Now my problem is how to upgrade Marantz CDP? :smash: Katapum Any ideas? :sad: poynton quote: Originally posted by Katapum Any ideas? :sad: You should initially at least follow the 'standard' upgrade path. Remove the output muting and any headphone amp. replace caps with Black Gate , Silmic, Cerafine or Oscon as appropriate. Separate the power lines and add extra regulators plus more transformers if possible. Add new clock. Search the threads - there are many ideas around. --------------------------- It is possible to replace the TDA1541 with the "A" but some circuit changes will be required. Andy Katapum quote: Originally posted by poynton Separate the power lines and add extra regulators plus more transformers if possible. No room for a new transformer: What IV stage and output stage do you advice?

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