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Old 9th March 2012, 04:14 AM   #11
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That sounds about right.
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Old 9th March 2012, 05:10 AM   #12
DREW028 is offline DREW028  United States
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IC3 reading black probe on amp ground outputs not installed:

pin 1: 18.9
pin 2: 12.03
pin 3: .041
pin 4: .025
pin 5: 12.02
pin 6: 6.4
pin 7: 2.5
pin 8: 5.2
pin 9: 5.2
pin10: 15.3
pin 11: 15.3
pin 12: 2.3
pin 13: .024
pin 14: .024
pin 15: 12.2
pin 16: 12.2
pin 17: .024
pin 18: 12.01
pin 19: 5.9
pin 20: 5.9
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Old 9th March 2012, 07:00 AM   #13
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Most of the voltages on that IC are irrelevant without the outputs in the amp.
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Old 9th March 2012, 07:14 AM   #14
DREW028 is offline DREW028  United States
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Ok, thats what i was thinking while looking at the board but wasn't sure. Im still waiting for the replacements to come in.
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Old 10th March 2012, 12:42 AM   #15
DREW028 is offline DREW028  United States
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Got the outputs in today. The amp produces sound. I tested in a small speaker for less than a minute. The only thing was when adjusting the gain the speaker had static. I don't remember if this happened before. Maybe its because the source I'm using?
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Old 10th March 2012, 08:57 AM   #16
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It could simply be a dirty potentiometer.
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Old 14th March 2012, 01:37 AM   #17
DREW028 is offline DREW028  United States
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Good call on the dirty potentiometer.

Only think I noticed is r29 and r27 get hot to the touch. Is this normal? They have to be removed to be test correct?
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Old 14th March 2012, 02:00 AM   #18
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It's normal for large resistors to operate at elevated temperatures. In general, if they're not so hot that they're desoldering themselves, they're OK.
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Old 3rd May 2014, 03:57 AM   #19
DREW028 is offline DREW028  United States
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I just picked up a second xs1500.1. These amps have an 80 amp fuse and are rated 1600watts at 1 ohm. Most newer amps have 2 80 amp fuses. Are these really that efficient?
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Old 3rd May 2014, 04:37 AM   #20
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Possible reasons that the 80 will hold.

The amp probably won't produce 1600 RMS.

Bass isn't constant so the high current draw through the fuse isn't constant.

The fuse doesn't blow at its rated current. It will probably pass 2x its rating for a short period of time.

Many amps have fuses rated far too high to protect the amp. I've seen far more blown power supplies than I have blown fuses. I generally drop the fuses down at least one step when I repair an amp.
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