Originally Posted by Floris
power supply issues are common on the G68 as far as I know.
replace it, and check for any bulging caps on the pcb boards.

Thanks a lot for the links, Flores. I will use it.



Originally Posted by swpnt
If you do get some sound, then I suspect the cards are making intermittent contact.
The only way I was able to make some noise with the digital outs are when connected to the Mconfig and start the Room Correction. When I click start the speaker’s display changes from PCM NL to Data 48K and after a brief second to MHR 48k.

I was able to repeat this and every time it works, I could hear a relay click and I press start and then the sound starts to come.

BUT I am not able to make any sound when trying to Calibrate the level of the speakers (using Mconfig or the front panel). When I tried it, the speaker’s display never changed from PCM NL and there is no relay click. It seems that the Room Correction are sending some commando “to open/start” the outputs, at least is what it seems because of the relay click.



Originally Posted by swpnt
The card edge connectors need to be really clean, bright gold, and you need to spray plenty of deoxit on the backplane connectors and agitate using a toothbrush.
Each card needs to be cleaned on both sides and you may need to insert and pull out a few times for really good contact.

I will do it again and inspect visually.



Originally Posted by swpnt
The digital output card looks to have been very poorly repaired with cheap capacitors, although if you're not using the analogue outputs on the card, I wouldn't worry too much about it.
Yes, I totally agree with that, it was done by the first owner and if the G68D starts to work I will try to replace it with better parts.



Originally Posted by swpnt
Check that the PSU is outputting +5.1 volts on the red wires - there should be a trim potentiometer in the PSU that can adjust the voltage - be careful though! - 5.0v is too little, 5.2v is too much!!
Ideally, the voltage should be measured from the regulator on the comms board (top, middle board)

Tonight I will try to do that. Can you point me to where to connect the ground of the multimeter? I will connect one end to the +5.1 red wire and the other I don’t know here to safely connect.

About the comms board reading, it seems to be easier to read.



Originally Posted by Gemeni
You can also use an eraser that is a bit rougher intended for ink to clean the contacts on the cards, and as Steve says use plenty oxide clean spray.

Eraser
Thanks for the tip, Gemeni. I will buy an eraser today to help in the process.


Best Regards,

Jorge