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Old 22nd April 2012, 04:35 PM   #1
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Default Crunch PRZA1500.1

My buddy told me this amp plays audio but it is not loud at all..


I checked the amp for rail to Rail oscillation But there isnt any...


Any ideas on what to check ?
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Old 24th April 2012, 02:42 AM   #2
DREW028 is offline DREW028  United States
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My clarion had a channel that was low. Ended up being a cap right at the rca inputs.
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Old 24th April 2012, 02:49 AM   #3
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Post a photo of the board.
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Old 29th April 2012, 08:52 PM   #4
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Heres some pics of the board
Attached Images
File Type: jpg CRUNCH.JPG (442.3 KB, 64 views)
File Type: jpg Crunch 2.JPG (466.6 KB, 58 views)
File Type: jpg CRUNCH 1.JPG (483.8 KB, 59 views)
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Old 29th April 2012, 09:34 PM   #5
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I know this sound simple, but it can be an issue with the head unit or one of the components at the input of the amp (like said before).

I got a similar problem with my system, which is innecesary complex. I have my head unit, a digital bass driver, a parametric equalizer and 2 amplifiers. Some times while driving one channel heard very low, but played cleanly. The problem sometimes corrected itself, but many times it simply appeared.

I removed DBD and the parametric eq and got good sound. Checked parametric eq and it was a bad cold solder at the inputs. Repaired and worked very well. That was like 2 years ago. Still working good.

Last edited by Desafinado; 29th April 2012 at 09:38 PM.
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Old 29th April 2012, 11:08 PM   #6
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No this amp has something wrong with it It has low output no matter what head unit is hooked up to it and it also does it on the test bench
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Old 30th April 2012, 04:36 AM   #7
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Does the audio increase if you pull the 4-pin opto-coupler?
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Old 30th April 2012, 09:16 PM   #8
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If i pull the 4 pin opto-coupler the amp has no output
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Old 1st May 2012, 06:37 AM   #9
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Do you have a solder bridge between the solder pads?

The opto-couplers are generally used to drive the muting transistors 'on' and when it's removed, it allows the audio to pass.

Can you locate the muting transistor?
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Old 1st May 2012, 08:58 PM   #10
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No solder bridges..

I think i located the muting transistor.. Do i need to pull it ?
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