Fwd: Wrong voltage display

[JEAN-FRANCOIS MENARD-3]

It seems also that he always have 0 A in the current display. So,  
voltage show around 5V, current show 0A and he get a low batt  
warning....

R9 and R10 seems to be good. He get around 4V on U6 PIN5 on the  
control board... seems strange....

Thanks for any suggestion.

73

>
> Le 05-07-09 à 01:31, JEAN-FRANCOIS MENARD a écrit :
>
>
>> A friend of mine here, who does not have an Internet access, have  
>> a basic K2 that show only 5V on the display instead of 12.X or 13X  
>> Volts. He does not have the battery option. But everything is  
>> working fine, TX, RX, etc.. The K2 is powered on a good 13.8V  
>> Motorola power supply.... His jumper on the control board is set  
>> to 12V, but the display always show 5V and he also get a "low  
>> batt" message at every couple of minutes....
>>
>> Where he should look ???
>>
>> 73
>>
>> ======
>>
>> Jean-François Ménard / VA2VYZ
>>
>> ======
>>
>>
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>
> ======
>
> Jean-François Ménard / VA2VYZ
>
> ======
>
>
>

======

Jean-François Ménard / VA2VYZ

======


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[Don Wilhelm-3]

Jean-Francios,

The 4 volt reading at U6 pin 5 sounds suspiciously like an open input to the
MPU, so look carefully at what is driving that line (U3 and asociated
circuits).

First check the center pin of Control Board P7.  With a 13.8 volt power
supply, the voltage there should be close to 13.5 volts.

If that is good, check the voltage at the junction of R9 and R10 (U3 pin 5),
that should read 2.64 volts, after that check U3 pin 7 - it should also be
2.64 volts.  aIf that is not true, look at the voltage on U3 pin 8, it
should be 13.5 volts.  If U3 pin 8 is correct AND U3 pin 7 is not 2.64
volts, U3 is not functioning properly.

73,
Don W3FPR

> -----Original Message-----
>
>
> It seems also that he always have 0 A in the current display. So,
> voltage show around 5V, current show 0A and he get a low batt
> warning....
>
> R9 and R10 seems to be good. He get around 4V on U6 PIN5 on the
> control board... seems strange....
>
> Thanks for any suggestion.
>
> 73
> >
> > Le 05-07-09 à 01:31, JEAN-FRANCOIS MENARD a écrit :
> >
> >
> >> A friend of mine here, who does not have an Internet access, have
> >> a basic K2 that show only 5V on the display instead of 12.X or 13X
> >> Volts. He does not have the battery option. But everything is
> >> working fine, TX, RX, etc.. The K2 is powered on a good 13.8V
> >> Motorola power supply.... His jumper on the control board is set
> >> to 12V, but the display always show 5V and he also get a "low
> >> batt" message at every couple of minutes....
> >>
> >> Where he should look ???
> >>
>

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