K2

[David Holton]

Chasing some advice.

K2 problem,   " touchy "  power control pot.

Removed Front panel and carried out resistance checks of U1 and J1 as per
the manual.

 

U1 checks out OK.

 

J1 reads,

Pins 1 to 4 should read  > 1M  I read open circuit, no reading at all, on a
Fluke 87

Pin 5                     "               > 1M  I read 29.56K

Pin 6                     "               > 50K I read  2.26M

Pin 7                     "               > 1M  I read  open circuit
"

Pin 8                     "                   GND I read GND

Pin 9                     "               > 50K  I read open circuit
"

Pin 10                   "               > 50K  I read 5.3M

Pin11                    "               > 50K  I read open circuit
"

Pin 12 to 14        "               > 50K  I read 6.96, 2.7, and 6.96MPins

Pin 15 to 20        "                All read in the middle of their
respective values and 20 is GND.

 

Any ideas please.

 

Regards

David

VK4DH

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[Don Wilhelm-4]

David,

">" means "greater than" and infinity (very large value) may equal "open
circuit".
That means the only potential problems you have is with J1 pin 5 which
should be greater than 1 meg and you are reading 29.56k.  Look for
solder bridges between pins over the entire board.

73,
Don W3FPR

On 11/3/2012 10:47 PM, David Holton wrote:

> Chasing some advice.
>
> K2 problem,   " touchy "  power control pot.
>
> Removed Front panel and carried out resistance checks of U1 and J1 as per
> the manual.
>
>  
>
> U1 checks out OK.
>
>  
>
> J1 reads,
>
> Pins 1 to 4 should read  > 1M  I read open circuit, no reading at all, on a
> Fluke 87
>
> Pin 5                     "               > 1M  I read 29.56K
>
> Pin 6                     "               > 50K I read  2.26M
>
> Pin 7                     "               > 1M  I read  open circuit
> "
>
> Pin 8                     "                   GND I read GND
>
> Pin 9                     "               > 50K  I read open circuit
> "
>
> Pin 10                   "               > 50K  I read 5.3M
>
> Pin11                    "               > 50K  I read open circuit
> "
>
> Pin 12 to 14        "               > 50K  I read 6.96, 2.7, and 6.96MPins
>
> Pin 15 to 20        "                All read in the middle of their
> respective values and 20 is GND.
>
>  
>

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