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[Need advice] Green LED keep blinking when charging

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[Need advice] Green LED keep blinking when charging

Postby superpong » August 6th, 2015, 8:03 am

Hi

I finish assembling Mini3 & X1. Everything seems fine. I'm really impressed with its musicality.
However when I charge my amp, I noticed that a green led does not illuminate in green according to description in "Initial check" page. Instead, the led blinks (approx 1 second on and 1 second off)
I measure B- and B+, and the voltage gradually rises.

Is this normal? or what's wrong with the led?
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Re: [Need advice] Green LED keep blinking when charging

Postby MisterX » August 6th, 2015, 9:07 am

Check the current draw between the power supply and the amp, the current draw should measure around 650mA when the LED is on.
And should read zero when the LED is off.
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Re: [Need advice] Green LED keep blinking when charging

Postby amb » August 6th, 2015, 1:03 pm

Does the LED blink green or red?
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Re: [Need advice] Green LED keep blinking when charging

Postby superpong » August 7th, 2015, 7:07 am

amb wrote:Does the LED blink green or red?


Green
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Re: [Need advice] Green LED keep blinking when charging

Postby superpong » August 7th, 2015, 7:08 am

MisterX wrote:Check the current draw between the power supply and the amp, the current draw should measure around 650mA when the LED is on.
And should read zero when the LED is off.


umm not sure how to measure but I will try.
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Re: [Need advice] Green LED keep blinking when charging

Postby superpong » August 7th, 2015, 7:12 am

One more thing - I observe that the Led keeps blinking (in green) overnight until morning.
What makes me confused is that the charging is successful.

Does it mean that U1 (charge management controller) work but malfunction?
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Re: [Need advice] Green LED keep blinking when charging

Postby amb » August 7th, 2015, 11:46 am

Look at your U1 chip. Is it a MCP73864? The behavior you describe seems to suggest that you have a MCP73862 instead. With MCP73862, the LED will blink green when the charge cycle is complete.
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Re: [Need advice] Green LED keep blinking when charging

Postby MisterX » August 7th, 2015, 9:43 pm

superpong wrote:
MisterX wrote:Check the current draw between the power supply and the amp, the current draw should measure around 650mA when the LED is on.
And should read zero when the LED is off.


umm not sure how to measure but I will try.


You have to put the meter between the amp and AC adapter to measure the current draw.
Cutting the cord on the AC adapter (or making a plug in "broken adapter") and then holding the probes can be a headache when using a handheld DMM......
Maybe A Kill-A-Watt meter would be an better solution here.

http://www.amazon.com/dp/B00009MDBU
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Re: [Need advice] Green LED keep blinking when charging

Postby amb » August 7th, 2015, 10:13 pm

The problem with using the Kill-A-Watt is that it measures current on the AC side of the power adapter, and what we want to know is how much current is being drawn on the DC output. The mapping between the two is not entirely predictable.

Anyway, check the chip. If it's a MCP73862, then the blinking green LED is the correct behavior when the battery is done charging.
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Re: [Need advice] Green LED keep blinking when charging

Postby MisterX » August 7th, 2015, 10:39 pm

amb wrote:The problem with using the Kill-A-Watt is that it measures current on the AC side of the power adapter, and what we want to know is how much current is being drawn on the DC output. The mapping between the two is not entirely predictable.


Yep, the results with kill-a-watt are not very accurate but that's fine for a quick functional test.
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