Hi everybody. New to the Forum. Have multiple DCC Players and got most of them working.
Marantz DD-82,DCC 900 (3), DCC600, DCC730 , …
I have two DCC 951 players and one of them has a distorted sound form both analog and digital tapes.
No dropouts or other problems reading the information of the tapes.
I switch the mechanisms and the problem seems to be in there, because distorted sound is now on the other player. Any suggestions where to look for the problem ?
Hi @Andre_Heskamp, welcome to the forum. When you say you switched mechanisms, do you mean you swapped the DDU into another chassis and the fault moved with the DDU? If so I would start with pinch rollers and capstan drive belt, although in my experience pinch rollers always cause drop outs.
@saturn5 Yes i swapped DDU and both have new pinch rollers and belts.
And i posted this question because i can’t find a reason why analog and dcc tapes both would distort. In the DDU analog is almost directly rerouted to the Dolby circuit and Digital works but also with distorted sound. The read/write board is the only place where the signals are go to the same chips, but how is it possible to see all the Track/Tape Data and hear anything from the digital circuit if the problem would be in there.
I Think i just spotted the problem. Have to test this tonight. The analog from the digital board is routed to the dolby circuit and from there back to the digital board, where its inserted to the analog in of the digital board trough the ADC and then back to the DAC <<<< Could this be the problem ?
Have to test if the digital out is is not distorted ! (only tested headphone/analog out)
@drdcc Thanks for making that video. I already used that video to match a head to an other PW03 Read-Write board in a DCC 900.
But the digital board (backside board) on the DDU of the 951, is there anything i can adjust there ?
I only suspect the DAC of the Digital board to be defective.
A DCC951 has a coaxial S/PDIF output. Any external DAC can convert that to RCA/Cinch. If this digital output works fine, I wouldn’t bother trying to replace the internal DAC but build an external one; it is both fun and can save a lot of money compared to commercial ones based on the same high-quality chip.
You can buy one, of course. If you don’t have anything with a coaxial S/PDIF input, I suggest getting the cheapest DAC and cable on Amazon, it won’t sound perfect, but you will be able to tell if it would work or not for very little money.