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x1 intial check

chi1

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x1 intial check

Postby krebob » November 17th, 2011, 7:18 pm

Hi Folks
I'm doing the initial checks on my x1.
The voltage between B- and OV is 7.6.
The voltage between B- and UV is 0.
My understanding is that they both should be high.
Any ideas?
Also, my batteries measure 8.8 mms thick.
Thanks,
Bob
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Re: x1 intial check

Postby amb » November 18th, 2011, 4:37 am

The protection chip is flagging a "low voltage" condition (i.e., one or both of the batteries is low on charge). Measure the voltage across the B+ and COM test points, as well as across COM and B-. What do you get? If the batteries are indeed low, charging them with the χ1 should "fix" the problem.
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Re: x1 intial check

Postby krebob » November 18th, 2011, 6:01 am

One battery reads 3.98 and the other reads 3.69.
Thanks,
Bob
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Re: x1 intial check

Postby amb » November 18th, 2011, 8:15 am

That should still be high enough not to flag a low voltage condition. Disconnect the batteries and reflow/check your solder joints around U2 and its surrounding parts. Install the jumper shunt over JP1 before reconnecting the batteries, and then remove it after the batteries are connected.
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Re: x1 intial check

Postby krebob » November 18th, 2011, 6:40 pm

Hello
I checked and reflowed all the solder joints and it still reads the same.
I had already replaced U2 thinking I may have damaged it.
I do get a reading of 7.66 volts on UV in relation to B+.
Does that make sense?
Thanks,
Bob
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Re: x1 intial check

Postby MisterX » November 18th, 2011, 7:31 pm

Did you try resetting the state machine’s undervoltage flag (by installing and then removing a shunt in the JP1 position)?
1352.5 and counting.
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Re: x1 intial check

Postby krebob » November 18th, 2011, 8:20 pm

Hello
I just tried resetting the undervoltage flag and there was no change.

Thanks,
Bob
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Re: x1 intial check

Postby particleman14 » November 18th, 2011, 8:45 pm

pics!?
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Re: x1 intial check

Postby krebob » November 20th, 2011, 8:49 am

Sorry, I'm unable to post pics at this time.
Thanks,
Bob
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Re: x1 intial check

Postby amb » November 21st, 2011, 6:21 am

OK, just a guess here -- U2 is probably bad (probably by static discharge). I know you said you replaced it once already, but these chips appear to be sensitive and easily damaged.
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