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crown 5000VZ


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#1 tonypacheco

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Posted 21 December 2006 - 12:06 PM

I handle almost the full range of crown amps. Of late I am having a problem with the VZ circuitry on three amps that remain in low lock position. The switche has been checked and if a 4K7 resistor is put in place of R712 than the amp remains locke in the high voltage mode.
I have a problem in trying to troubleshoot in this area and would appreciate if someone could help with
1) what reference point to use
2)voltages to expect and how to isolate the faulty component
regards
Anthony Pacheco

#2 tonypacheco

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Posted 23 December 2006 - 10:53 PM

still stuck with the 5000vz nothing seems to work the control voltages -BI2 and +BI2 seem to be fine but the voltages on pins 5&6 0f U708B do not change as they should. Resistors R740,R737,R738,R741 R739,R745,R746,,R793 ICs U708,U709,U711 have been checked. U710 has been removed. Q711 and c737 have been checked with no positive results. the amp ch2 remains stuck in high current mode..
only when R742 is put in will the amp go into low current mode.
I am begining to suspect that the fault could be PCB leakage at the terminals of U708B
Sadly I have three amps down in this condition

#3 Bradford Benn

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Posted 03 January 2007 - 02:40 PM

I would recommend contacting Tech Support directly for this level of question.
-=Brad

Bradford Benn
Business Development Manager - Crown International
http://www.crownaudio.com/

#4 tonypacheco

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Posted 04 January 2007 - 10:40 AM

QUOTE(Brad Benn @ Jan 4 2007, 01:10 AM)
I would recommend contacting Tech Support directly for this level of question.
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would appreciate if you could recomend a support guy who could help out
For the time being I  have put them into a forced high voltage mode but I frankly  do not like to use the amps in this fashion