DENO DCD-620 : Is it possible to have S/PDIF output - diyAudio
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Old 17th October 2010, 05:45 PM   #1
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Default DENO DCD-620 : Is it possible to have S/PDIF output

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
Attached Images
File Type: gif CXD-1125Q-DCD-620.GIF (158.1 KB, 110 views)
File Type: gif CXD-1125Q-DCD-620-2.GIF (148.6 KB, 99 views)
File Type: jpg CXD-1125Q-DCD-1560.jpg (220.3 KB, 101 views)
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Old 17th October 2010, 09:48 PM   #2
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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.
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Old 17th October 2010, 10:33 PM   #3
JesseG is offline JesseG  Canada
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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
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Old 18th October 2010, 08:18 PM   #4
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Thank you a lot for your replies. I'll try it soon (i'll post a new message)

Manuel
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Old 28th October 2010, 11:01 AM   #5
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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
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File Type: jpg P1000777-50.JPG (266.8 KB, 76 views)
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Old 28th October 2010, 02:32 PM   #6
poynton is offline poynton  United Kingdom
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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


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Last edited by poynton; 28th October 2010 at 02:35 PM.
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Old 28th October 2010, 06:22 PM   #7
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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
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Old 15th February 2011, 06:07 PM   #8
pistone is offline pistone  Italy
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Cool how?

Quote:
Originally Posted by 29manu29 View Post
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!
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Old 17th February 2011, 09:50 AM   #9
Lautar is offline Lautar  Ukraine
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its 100% tested and worked shem
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