iZ Technology Corporation

I am running two Radar 24 machines linked via Radar link. Both machines are running V3.44 software. Last week I received the error message 'Checksum Error' at boot up on the master unit so, I changed the motherboard battery which seemed to sort that out.
I now have a problem viz;
When I switch the unit on, after boot up I have a low level signal appear on all the tape returns on the desk which are fed from the analogue outs from the Radar. If I listen to the signal it sounds like digital noise.
After playing a project for a few minutes the noise disapears and I can not detect any signal at the tape returns that should not be there.
Radar is set as slave and is clocked by word clock directly from an apogee Big Ben. There is nothing daisy chained and the Big Ben reports the correct termination.
Clock rate is 44.1 which matches the sample rate of the project. The reason that I suspect that the problem may be related to Word sync is that the noise sounds to be a digital problem and, on a couple of ocassions at start up the session controller screen displays 48KHz illegal or 44.1KHz illegal.
Any help that you can give me would be greatly appreciated.

After replacing the CMOS battery, did you go through and reconfigure the CMOS settings?

You can find our technical document with this procedure here:

http://www.izcorp.com/pdf/supp...oards_CMOS_Setup.pdf

Hi
Thank you for replying. Yes, I did reset the CMOS settings. In fact, I reset them twice to be sure that I had done it properly and that the settings had been saved.
A few days on from my original post the problem is still exactly the same. The noise is detectable for about 5 minutes from start up and then disappears.
Any other ideas as to what may be wrong?

Come on IZ where is your legendary support? I've posted here, I've emailed IZ support but still no nearer to a solution to my problem. Any ideas?

How long has the the problem existed? Did it just start happening after changing the CMOS battery?

The fact that the noise can be heard through both sets of channels from both RADARs presents the idea that RADARLink may be the problem. Have you tried soloing each RADAR without RADARLink enabled to see if each system creates the noise individually?

When exactly during the boot up process did the screen display the message 48KHz/44.1KHz illegal?

Hi
Yes, the problem started after changing the CMOS battery.
I have soloed the machines. As I said in my original post the signal on the slave machine is much lower. Now that I have had the chance to investigate further I can confirm that the noise from the slave appears to be just background noise and is detectable only at maximum gain levels accross the board so I think that the master is where the problem lies. On the master machine (which is the one in which the battery failed the signal is much higher and contains a loud crackle.
The 48KHz/44.1KHz illegal appeared on the seeion controller at the end of the boot up.
I have tried changing the wordclock frequency and each change affects the sound of the noise.
It almost disappears at 88.2KHz.

Here are some further tests and troubleshooting procedures:

1 - Check to see if the CHS and ANA grounds are grounded on the back of the unit(two terminals with a small piece of metal under them). If they aren't (the piece of metal is absent)then ground them, if they are (the piece of metal is present) then un-ground them.

2 - Run on internal clock.

3 - Connect each radar to a different mixer, to factor out the desk.

4 - Run each RADAR independently, so that there is no RADARLink and no possible communications between both units.

5 - Disconnect all but one audio out to eliminate potential grounding issues, then test.

6 - Check for swollen capacitors (black cylinders with flat silver tops - check if they are oozing any discharge or misshapen) on the any of the cards, especially the analog converters and the Adrenaline (the longest card with ribbons connected to it) cards.

7 - The analog power supply connector (the orange plug that plugs in to the SIC0 card (main daughterboard card that lies flat on top of the other cards) and check the voltages. Orange = +18 Black = -18 Red = +5 Black = -5

Note all the results, did any make a difference?

Thank you for the help, I will conduct the tests that you suggest and report back ASAP.

Hello again

I have now conducted all of the tests that do not involve opening the Radar unit and can confirm that nothing has made any difference. I have, however, established that the fault is within the Master (my original unit) and not the slave which, when installed on it's own, performs perfectly. Obviously, the fault lies within the box. As I am not an electronics engineer I thought that the best solution would be to get the machine to the UK dealer for them to find and repair the fault so, I have arranged for this to be done. Out of interest and maybe as a reference for anyone who may suffer a similar problem in the future I shall post the outcome on this thread.
Meanwhile a big thank you to the support team for your advice thus far. I now know where the fault lies and I can get it fixed quickly.
Thanks again.

Just to complete the thread. I have now got my Radar back up and running. For the record, the fault was the power supply.