Meridian Unplugged - Powered by MrTechGuy.co.uk Forums Discussion Meridian - Systems G68D No audio on digital outputs

I have recently seen a photo uploaded by user Gemeni.

Perhaps he has these G series spare cards for sale? I also contacted him.

If you can find out which card is faulty, perhaps if possible you can buy a spare card from him.
Just a suggestion, perhaps this is possible.

Thanks for the help.

In fact I am not able to produce the test tones, all I can do is to send pink noise when asking the Mconfig to start the Room Calibration. The regular volume calibration tone I cannot generate.

All the inputs I had tested output sound via Zone 2 and Zone 3, I tried optical, coaxial and digital input outputting to the Zone 2/3 digital and analog outs, it always works perfectly. Is this an indicating that my input board is ok?

Where is the clock of the system located? Yesterday I notice that the digital out tried to send something to the speakers, where the display was fast changing from PCM NL, PCM 96k and PCM 32k.

Today I will try to remove the cards was you mentioned and see if it works without the tuner card. Also I will clean the connections again.

Best Regards,

Jorge

Nice to know. I messaged him.
Thanks again!

I remove and cleaned ALL the PCB, then I started to test the product without the zone 2/3, tuner and input boards. Always the same scenario, no sound in the digital outputs.

I measured the voltage in all boards and they all read about 5.05 volts and 3.33 volts.

The volume button still are not responsive.

Is there a right slot for every board or can I try the FICL and DSP board in another placement?

I was also in doubt it they are in the right place right now, but I found no picture of the output side of the processor showing the boards proper placement.

Any ideas?

Best Regards,

Jorge

Hi,

I started an other tread with somewhat of the same problems but perhaps it's better to join in here.

I have changed the PSU and capacitors (thanks for the tips Floris). Cleaned the contacts, retyped etc.
I still get no sound from any input via digital coax, there is no relay clicking. The relay clicks before calibration starts and that mode works. Also if Calibration is being started from standby - more modus which also works after the relay click. Is it the relay on the digital board and is it controlled by 2 circuits?

I've measured the voltage across the regulator on the comms PCB 5,05 V and on the digital out board 4,9 V

I don't think the G-Series is fussy on card placement. It looks like all the card slots are the same.

If you follow the Meridian Tech Note and build a basic system - if that doesn't work, then one (or more) of the basic cards are faulty.

Ideally, you need a known good set of cards to substitute one by one to eliminate the faulty card.

Good luck,

Steve

I took mine apart again. Cleaned everything again and used some contact chemie protector after cleaning.

Calibration mode worked with the minimum of cards as described in TN32.

The next card of the list was the analog in. No sound but changing the DSP mode for tape went very slow and the G68 froze for a long time. Removed it, restart and continued with digital in card. Bingo sound tru digital out.

Continued with the other boards and it kept working. Added the analog in board and it kept working only without the analog in function, so have to look in to that.

I made the mistake to try to turn it on during the powering up (the display shows Meridian before going to standby) which shuts down the startup process and the G68 did not work.

Removing that card and startup again, turned it off again, inserted the card and waited until the G68 went in standby mode and the card was aded to the system and the G68 worked again.

For now fingers crossed that it keeps working. I’m going to change the capacitors on the analog in board to see if that helps.

Perhaps this info helps the ts.

After renewing PSU to ECM40UT31 and capacitor repair 6 months ago which got it functioning good. I hadn't used it till last week. It worked fine for a few movies but after that the display started to show the Meridian logo when it was in standby. It did that constantly until the power was off. Putting it in standby again resulted in the same problem after an hour or so.

I’ve checked the output voltages of the PSU +12,7 volts, lowered that, the automatic startup didn't happen anymore but the unit did not respond to the MSR+ and the comms did not work so good.

Checked the 5v output 4.8 volt, adjusting it to 5v on the regulator and the 12v was 12.7 again. Tried the PSU from my HD621 same voltages.

How problematic is the rise of the 12v to 12,7 volt for the G68 and is this normal with the psu?