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Member Since 02 Dec 2004
Offline Last Active Apr 17 2014 08:09 AM

Posts I've Made

In Topic: What's Z1 in a MA5002VZ?

17 April 2014 - 08:05 AM

Hello Jeff,

I did find Z1 on a Terminator diagram (cpn 102396). Z1 is a 'ground lift' link, possibly installed for grounding issues.
If Z1 is installed, the main ground (also Common output) is connected to chassis ground (usually, the source AC ground).

If Z1 has flared, it is possible you have an issue with your grounds.


In Topic: ZeeVee Delay Issues

17 April 2014 - 07:54 AM

Hello Wally,

As Avi has mentionned you can't 'advance delay' in the future.
Since the CDi DSP 'latency' is approx. 1.11ms, there should not be any audio issues with the CDi, per se.
So, my conclusion is that the audio delay is caused by the ZV system. Perhaps, updates to the ZV system might fix the lipsync issues.


In Topic: CTS4200a dead

15 April 2014 - 01:09 PM

Hello ATPP,

Fantastic! I'm glad you go it working!


In Topic: Older XLS602 - One side lacks hi end

10 April 2014 - 09:26 AM

Avi, I am unfortunately not a Bruins' fan! I'm a Habs fan! And more to the point, a hockey fan; All games are good!

And, as Avi comments, this is 'oscilloscope time'!
Signal input : sine (better if you have square waves!) @ 1 kHz; 1.2VAC (+4dB)
Compare input signals with the signals at the level controls and then test output signal with and without loads:
- Without loads output signal should be strong;
- With loads, signal should be same but perhaps 20% lower than without loads;
It is possible that you may have a faulty coupling cap in the input section, on the small input board.
I still think that the output filter board could have been damaged; Check and compare the signal directly at the output, but before the output coil and again at the terminals.

Hope this helps!


In Topic: Crown XTI4000 no power problem

10 April 2014 - 08:56 AM

Did you notice if the noise eventually disappeared with the cover removed? If so, then it could be thermally sensitive.
Since the 'noise' disappears after a while, why not try some freeze spray on the components when the noise is observed?
If the noise should disappear, use a heat gun to reactivate the noise.
Verify the 3.3V circuit : It is derived from the 5V regulated supply.
I don't think it comes from the SMPS but from the secondary side.

Follow the signal :
Inject a 1KHz signal into one or both inputs.
Verify and scope the output waveform and determine if you can 'see' the motorboating signal with sine wave.
Verify then the input to the A/D converter and the output of the D/A converter.
If the noise is visible, try to use the EQ of the DSP and observe if it has some behavior on the noise.

Note : It is possible to have a bad A/D converter.