DENO DCD-620 : Is it possible to have à S/PDIF output

29manu29 · 17th October 2010, 04:45 PM

Hi,

I have a DENON DCD-620, it don't have a S/PIF output and i would like to add one (i have a Sencer DAC PCM 1564A). This cd player have a CXD-1125Q chip. I've jointed the schematic. I've found the DCD-1560 schematic, this CD player use a cxd-1125Q and have a coaxial and an optical output, the numerical signal is take on #27 pin (DOTX). On DCD-620 this pin is GTOP, i hope the fonctionnality of this pin is function the states of #55(MD1), #56(MD2), #57(MD3), on DCD-620 the states are :
MD1 = "High"
MD2 = "Low"
MD3 = "High"
and on the DCD-1560 the states are :
MD1 = "Low"
MD2 = "Low"
MD3 = "High"

If i change the state of MD1 is it possible to made a S/PDIF output on my DCD-620 ? If yes does it need resistor and capacitor

stephensank · 17th October 2010, 08:48 PM

You are correct. Once you alter those MD connections, all you need, minimally, is a 75ohm series resistor between the DOTX pin and the output jack. Cap and/or transformer optional, but not desirable, IMO, unless you have ground loop issues.

JesseG · 17th October 2010, 09:33 PM

29manu29

As stephensank says, this is an easy fix. I have done the same with several Yamaha CDPs that were not equipped with Coax digital out. get some very fine 0.5mm wire and solder carefully to the pad of pin 27. Then find a ground on the same chip and solder another wire there. Twist the two wires carefully together and solder to ground and 75 ohm r soldered close to the center of a good quality RCA (or better, a BNC) that is ISOLATED from the chassis.

Happy listening

29manu29 · 18th October 2010, 07:18 PM

Thank you a lot for your replies. I'll try it soon (i'll post a new message)

Manuel

29manu29 · 28th October 2010, 10:01 AM

Hi,

I've tried to tweak my CD player. First when i've opendes my CD player, my MD1 = "Low", MD2 = "Low", and MD3 = "High", for me no modifications were necessaries. I've soldered an little coaxial wire on pin #27 (look at picture) and i've soldered a 75R between the center of the RCA and the end of wire (look at picture). When i connect my dac without CD in the CD player, my DCA detects a signal, two leds, "48KHz" and "Lock" are lights on my DAC. When i put a CD the motor doesn't run on my CD player. I've tried to connect my DAC when a CD is readen, the CD player motor stops also. Somebody have an idea ?

Manuel

poynton · 01:35 PM

2 thoughts:

Ground loop causing problems - move your grond to a star near the PSU.

Loading of the chip is wrong - insert resistor or buffer with a gate chip?

Andy

.

29manu29 · 28th October 2010, 05:22 PM

Hi,

I've resolved my problem i've soldered a serial 220R with the wire and the center of the RCA and i've soldered a 75R between ground and center of the RCA. It's perfect.

Regards

Manuel

pistone · 15th February 2011, 05:07 PM

Quote:

Originally Posted by 29manu29

Hi,

I've resolved my problem i've soldered a serial 220R with the wire and the center of the RCA and i've soldered a 75R between ground and center of the RCA. It's perfect.

Regards

Manuel

Hi Manuel, can you explain better? Even with a photo? Thank you!

Lautar · 17th February 2011, 08:50 AM

its 100% tested and worked shem

17th October 2010, 09:33 PM	#3
JesseG diyAudio Member Join Date: Jul 2005 Location: Mid coast of British Columbia	29manu29 As stephensank says, this is an easy fix. I have done the same with several Yamaha CDPs that were not equipped with Coax digital out. get some very fine 0.5mm wire and solder carefully to the pad of pin 27. Then find a ground on the same chip and solder another wire there. Twist the two wires carefully together and solder to ground and 75 ohm r soldered close to the center of a good quality RCA (or better, a BNC) that is ISOLATED from the chassis. Happy listening __________________ "If we crashed our cars as often as we crashed our computers, we'd all be dead!"

28th October 2010, 01:32 PM	#6
poynton Magneto the Gravity Man diyAudio Member Join Date: Mar 2005 Location: A life on the ocean waves when I'm not at home in N. Wales (but I'm not Welsh so no sheep jokes!)	2 thoughts: Ground loop causing problems - move your grond to a star near the PSU. Loading of the chip is wrong - insert resistor or buffer with a gate chip? Andy . __________________ If it ain't broke, break it !! Then fix it again. It's called DIY ! Last edited by poynton; 28th October 2010 at 01:35 PM.

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17th October 2010, 08:48 PM	#2
stephensank diyAudio Member Join Date: Oct 2006	You are correct. Once you alter those MD connections, all you need, minimally, is a 75ohm series resistor between the DOTX pin and the output jack. Cap and/or transformer optional, but not desirable, IMO, unless you have ground loop issues.

18th October 2010, 07:18 PM	#4
29manu29 diyAudio Member Join Date: Jun 2005 Location: Bretagne	Thank you a lot for your replies. I'll try it soon (i'll post a new message) Manuel

28th October 2010, 05:22 PM	#7
29manu29 diyAudio Member Join Date: Jun 2005 Location: Bretagne	Hi, I've resolved my problem i've soldered a serial 220R with the wire and the center of the RCA and i've soldered a 75R between ground and center of the RCA. It's perfect. Regards Manuel