Need help to connect CEC TL-51X CD transport

Sunsun22 · 8th July 2006, 06:42 PM

Just bought a CEC TL-51X CD transport today but my Dack 2.0 DAC cannot detect signal from this transport. There is nothing wrong with the transport or DAC since both of them work with other gears.

1. What is the problem?
2. How to overcome this?

Thank you

georgehifi · 8th July 2006, 10:59 PM

Try to power the dac first then power up the transport, this has worked for me before on dac that are stuborn to lock.

Cheers George

Sunsun22 · 9th July 2006, 12:45 PM

I wrote an email to CEC Japan on Saturday night and they replied on Sunday morning at 10am telling me to contact their agent in China. Called the engineer in the afternoon and situation solved by shorting the output pin before plugging into the DAC. This is an unmatch design between CEC and some older design DAC. The engineer said he can change the circuit for me if needed.

The CEC is now powered up. The sound is great even without burn-in.

Appreciate the service of CEC Japan and his agent in China that solve the problem in such a prompt manner.

:-)

yetis · 2nd July 2008, 12:32 AM

How do you short the output ? My CEC isn't working.

Sunsun22 · 3rd July 2008, 11:09 AM

I just a screw driver to touch the center pin and side of the plug.

yetis · 3rd July 2008, 02:52 PM

Thanks for the reply. While the screw driver trick did get a lock, I still don't get any sound.

I know the transport works, as I used it with another D/A and I know the D/A works, as I used it with a different digital source. The D/A is a Pass Labs D-1.

I received this from CEC today. Looks like the CEC needs a little work inside.

"When TL51X detects a DA converter via digital cables it makes the output, but some DA converters may have no such standard trigger in the digital input circuit.

If you may put 1k ohm resistor in your digital cable, the condition will mostly solved. Our service department for domestic (Japanese) customers is adding this 1k ohm resistor inside of the CD transport on digital output board instead of outer cable.

Location of new resister to be mounted:
RCA (inside): one resistor between center (cold) and one four corner (hot)

XLR (inside): total two resistors, one each between ground and hot/cold"

It seems simple enough. I have never soldered anything of value in my life. Is there any special sort of solder I should use?

ALP · 6th July 2008, 10:14 AM

If you connect via COAX some DACs not lock because COAX-output of CEC-TL51 have low output signal.
It`s known problem

Simply method to solve problem: use AES output via cross AES-COAX transformer.

Part of TL51 output circuit attached

Sunsun22 · 7th July 2008, 05:24 PM

My job was simple. While the transport is turned on, use a screw driver to short the center pin and ground of the coaxiel cable, plug the cable to the D/A which is already at on mode. Press the play button and there it works. However, you have to repeat the same procedure if you turned off your CD player.

radar · 14th March 2010, 05:31 AM

Hi ALP,
can you please give the source of the circuit diagrams for the TL51X.
I have tried everywhere.

tiefbassuebertr · 6th January 2012, 01:23 PM

in this case this thread could be of interest:
Parasound "C/DP 1000" (CDP1000 C/DP1000 CDP) CEC 2100 3100 Service Manual wanted

8th July 2006, 06:42 PM	#1
Sunsun22 diyAudio Member Join Date: Jul 2004 Location: Hong Kong	Need help to connect CEC TL-51X CD transport Just bought a CEC TL-51X CD transport today but my Dack 2.0 DAC cannot detect signal from this transport. There is nothing wrong with the transport or DAC since both of them work with other gears. 1. What is the problem? 2. How to overcome this? Thank you

8th July 2006, 10:59 PM	#2
georgehifi diyAudio Member Join Date: Sep 2003 Location: Manly Australia (Gods Country)	Try to power the dac first then power up the transport, this has worked for me before on dac that are stuborn to lock. Cheers George __________________ Avatar : Production Lightspeed Attenuator www.lightspeedattenuator.com

14th March 2010, 05:31 AM	#9
radar diyAudio Member Join Date: Mar 2007	Hi ALP, can you please give the source of the circuit diagrams for the TL51X. I have tried everywhere. __________________ Eric

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9th July 2006, 12:45 PM	#3
Sunsun22 diyAudio Member Join Date: Jul 2004 Location: Hong Kong	I wrote an email to CEC Japan on Saturday night and they replied on Sunday morning at 10am telling me to contact their agent in China. Called the engineer in the afternoon and situation solved by shorting the output pin before plugging into the DAC. This is an unmatch design between CEC and some older design DAC. The engineer said he can change the circuit for me if needed. The CEC is now powered up. The sound is great even without burn-in. Appreciate the service of CEC Japan and his agent in China that solve the problem in such a prompt manner. :-)

2nd July 2008, 12:32 AM	#4
yetis diyAudio Member Join Date: Jul 2008	How do you short the output ? My CEC isn't working.

3rd July 2008, 11:09 AM	#5
Sunsun22 diyAudio Member Join Date: Jul 2004 Location: Hong Kong	I just a screw driver to touch the center pin and side of the plug.

3rd July 2008, 02:52 PM	#6
yetis diyAudio Member Join Date: Jul 2008	Thanks for the reply. While the screw driver trick did get a lock, I still don't get any sound. I know the transport works, as I used it with another D/A and I know the D/A works, as I used it with a different digital source. The D/A is a Pass Labs D-1. I received this from CEC today. Looks like the CEC needs a little work inside. "When TL51X detects a DA converter via digital cables it makes the output, but some DA converters may have no such standard trigger in the digital input circuit. If you may put 1k ohm resistor in your digital cable, the condition will mostly solved. Our service department for domestic (Japanese) customers is adding this 1k ohm resistor inside of the CD transport on digital output board instead of outer cable. Location of new resister to be mounted: RCA (inside): one resistor between center (cold) and one four corner (hot) XLR (inside): total two resistors, one each between ground and hot/cold" It seems simple enough. I have never soldered anything of value in my life. Is there any special sort of solder I should use?

7th July 2008, 05:24 PM	#8
Sunsun22 diyAudio Member Join Date: Jul 2004 Location: Hong Kong	My job was simple. While the transport is turned on, use a screw driver to short the center pin and ground of the coaxiel cable, plug the cable to the D/A which is already at on mode. Press the play button and there it works. However, you have to repeat the same procedure if you turned off your CD player.

6th January 2012, 01:23 PM	#10
tiefbassuebertr diyAudio Member Join Date: Jul 2005 Location: D-55629 Schwarzerden	in this case this thread could be of interest: Parasound "C/DP 1000" (CDP1000 C/DP1000 CDP) CEC 2100 3100 Service Manual wanted

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