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Old 3rd June 2015, 09:16 AM   #1
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Default Crown XLS 802

I am having a weird issue with XLS 802

Amplifier appears to operate properly but anything you plug behind will make signal led and clip led full on .

Anybody come across that ?

Kind regards
Sakis
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Old 3rd June 2015, 12:10 PM   #2
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Plug behind, what? Speakers, input? Likely ultrasonic oscillation, checked it with a scope?
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Old 3rd June 2015, 12:12 PM   #3
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Input βρε !!!
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Old 3rd June 2015, 12:13 PM   #4
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Checked with a scope flawless ....
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Old 3rd June 2015, 12:16 PM   #5
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Must be something there that puts your indicators to go haywire..... DC?... If not, then no clue, sorry
Oh... one more thing. Check for ground continuity from input to PCB.
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Old 3rd June 2015, 08:32 PM   #6
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Its normal for some Crown of that era that often resistors go open ... but it will be not easy to trace that i was just hopping that someone had seen this before ...

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Sakis
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Old 4th June 2015, 09:23 PM   #7
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It seems that there is LM 339 involved in those two leds Replaced that since i have seen them fail often in VU application especially in the VU of the Sanyo plus 55.
No change .
Problem is that LM 339 is nowhere to be seen in the existing schematics available in the network. Either its a different version ( mine is xls 802 D ) .
Next step is to advance my troubleshooting based on the known operation of the 339In between if someone can come up with a proper or complete schematic i will be more than glad to have

thank you !
Kind regards
Sakis
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Old 4th June 2015, 09:29 PM   #8
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LM339 works there with split rails measured Pin 3 9+ volts while pin 12 minus 12 volt that also not look right

I need schematic
Kind regards
Sakis
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Old 5th June 2015, 02:08 PM   #9
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thanks to a guy called Kip got my shelf a compete schematic helping me understand the principal of operation of the 339 at this application.

Problem in the amplifier was the reference of clip common for both amplifiers since this is coming from +Vcc .

Obviously my initial guess was correct and one simple resistor that provides the clip reference was totally open like others that i have found in the past in XLS series

R159 150K was found guilty !!!!

Kind regards
Sakis
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