finishing my k2 with a Q7 problème

[Sylvain St-louis]

Hi! All

I'm finishing my K2 and I did the resistance checks. I have 2.27K ohms
result on the Q7 base instead of 2.5K-3.0K ohms. Because of the minim
difference I run the k2 with this failded test and I have 520 ma
reading.

Any one have an Idea?

Thanks

Sylvain VE2SSL

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[Don Wilhelm-3]

Sylvain,

I doubt that the high receive current is due to that incorrect resistance
reading.

One of the possible causes for a high receive current is if 8T is on during
receive - measure the voltage on Control Board Q1 collector, it should be
zero or very close to that during receive.

Check the orientation of diodes D6 and D7 - the easiest way to check diode
orientation is to compare with the parts placement diagram in the back of
the manual.

You may want to check to see if any resistors are getting quite warm - that
will indicate what circuit is drawing too much current.

If it is like the one with similar symptoms that I repaired Friday, RF Board
R49 was getting hot due to a leaky collector to base junction in Q5 - but
your problem may be quite different.

> -----Original Message-----
>
> I'm finishing my K2 and I did the resistance checks. I have 2.27K ohms
> result on the Q7 base instead of 2.5K-3.0K ohms. Because of the minim
> difference I run the k2 with this failded test and I have 520 ma
> reading.
>
> Any one have an Idea?
>
> Thanks
>
> Sylvain VE2SSL
>
>

--
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[Sylvain St-louis]

Juste to be sure, i'm talking about Q7 on the rf board. Sorry for that

Sylvain ve2ssl
Le mardi 20 septembre 2005 à 16:42 -0400, W3FPR - Don Wilhelm a écrit :

> Sylvain,
>
> I doubt that the high receive current is due to that incorrect resistance
> reading.
>
> One of the possible causes for a high receive current is if 8T is on during
> receive - measure the voltage on Control Board Q1 collector, it should be
> zero or very close to that during receive.
>
> Check the orientation of diodes D6 and D7 - the easiest way to check diode
> orientation is to compare with the parts placement diagram in the back of
> the manual.
>
> You may want to check to see if any resistors are getting quite warm - that
> will indicate what circuit is drawing too much current.
>
> If it is like the one with similar symptoms that I repaired Friday, RF Board
> R49 was getting hot due to a leaky collector to base junction in Q5 - but
> your problem may be quite different.
>
> > -----Original Message-----
> >
> > I'm finishing my K2 and I did the resistance checks. I have 2.27K ohms
> > result on the Q7 base instead of 2.5K-3.0K ohms. Because of the minim
> > difference I run the k2 with this failded test and I have 520 ma
> > reading.
> >
> > Any one have an Idea?
> >
> > Thanks
> >
> > Sylvain VE2SSL
> >
> >
> --
> No virus found in this outgoing message.
> Checked by AVG Anti-Virus.
> Version: 7.0.344 / Virus Database: 267.11.3/106 - Release Date: 9/19/2005
>

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