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Clip light on Crown amps

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Joseph D. Macry:
I'm servicing sound system at a high school football field. There are several Crown CTs2000 amplifiers all receiving the same signal from DSP.
Two of these amps show one red clip light (it comes and goes) even though audio is below clipping. All speakers are producing audio.
The signal meters on the channel with clip light runs a little lower than the other side, even in parallel (Y-input) mode.
What could the red clip light be telling me, if not clipping nor protect mode?

Lee Buckalew:

--- Quote from: Joseph D. Macry on September 02, 2016, 04:50:20 PM ---I'm servicing sound system at a high school football field. There are several Crown CTs2000 amplifiers all receiving the same signal from DSP.
Two of these amps show one red clip light (it comes and goes) even though audio is below clipping. All speakers are producing audio.
The signal meters on the channel with clip light runs a little lower than the other side, even in parallel (Y-input) mode.
What could the red clip light be telling me, if not clipping nor protect mode?

--- End quote ---

One of the more common problems indicated by the clip lights acting as you are describing is failed portions of the output stage.  That is where I have typically seen this.  If that is the cause it will require replacement of internal parts.

Lee

John Roberts {JR}:

--- Quote from: Joseph D. Macry on September 02, 2016, 04:50:20 PM ---I'm servicing sound system at a high school football field. There are several Crown CTs2000 amplifiers all receiving the same signal from DSP.
Two of these amps show one red clip light (it comes and goes) even though audio is below clipping. All speakers are producing audio.

--- Quote from: from OM ---a. Fault indicator
Red LED, one per channel,  ashes when the ampli er output channel has stopped operating. Usually this means that the ampli er must be serviced.

B. Thermal indicator
Red LED, one per channel, illuminates when the channel has shut down, or is very near shutting down, due to thermal stress or overload.

--- End quote ---
The signal meters on the channel with clip light runs a little lower than the other side, even in parallel (Y-input) mode.
What could the red clip light be telling me, if not clipping nor protect mode?

--- End quote ---
http://rdn.harmanpro.com/product_documents/documents/1945_1407779508/141280-1_CTs_2ch_series_operation-08-13_original.pdf

When in doubt RTFM

JR

Lee Buckalew:

--- Quote from: John Roberts {JR} on September 02, 2016, 04:59:05 PM ---The signal meters on the channel with clip light runs a little lower than the other side, even in parallel (Y-input) mode.
What could the red clip light be telling me, if not clipping nor protect mode?

http://rdn.harmanpro.com/product_documents/documents/1945_1407779508/141280-1_CTs_2ch_series_operation-08-13_original.pdf

When in doubt RTFM

JR

--- End quote ---

Those are all true John, I have also seen the clip indicators light with damaged output sections.  I have seen this repeatedly, on different CTs on the same install. 
CTs were quite awful when they first came out, lots of failures.  This was fixed in the 4 and 8 channel models and the later 2 channels.  Don't know that the stigma of the early problems ever wore off.

Lee

Joseph D. Macry:
Here is a pic

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