K2 S/N 5318 FP resistance checks problem

[Bob Sosin]

I've reached the resistance checks for the front panel on page 28 of the
manual, and things do not appear to be going well.

I do have the KSB2 kit, so I have installed the front panel parts from that
kit, as directed on page 28 of the K2 manual. I've attempted to inspect for
solder bridges, cold solder joints, and unsoldered components, but I'm very
much a software guy, and don't have a great deal of confidence in my
inspection abilities.

Here are the resistance check results:

U1 pin 1            29.02K

U1 pin 2            29.01k

U1 pin 3            48k

U1 pin 4            15.4 M

U1 pin 5            24.3 K

U1 pin 6            0

U1 pin 7            0

U1 pin 8            0.2 ohms

U1 pin 9            0.8 ohms

U1 pin 10          0.2 ohms

U1 pin 11          0.2 ohms

U1 pin 12          9.85 K

U1 pins 13 - 40             17M - 23M

J1 pins 1-9        0

J1 pin 10           26.7M

J1 pins 11 - 14  0

J1 pin 15           29.2K

J1 pin 16           29.02 k

J1 pin 17           29.02 k

J1 pin 18           24.36 K

J1 pin 19           2.236 K

J1 pin 20           0.2 ohms

 

Can you suggest the next steps?

Thanks,

Bob

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[Don Wilhelm-3]

Bob,

Everything looks good EXCEPT J1 pins 1-7, 9 and 11-14.  These should not be
zero ohms or near zero ohms.
Check your soldering to see if there is excess solder that might be shorting
things together - that is the most likely cause.  After all, J1 pins 1, 2
and 3 connect only to the AF Gain, so all those should indicate a high
resistance to ground (at this point, the AF Gain control should connect to
nothing else (see the schematic), and pins 4 and 5 go only over to the mic
configuration header position and dead end there because you do not have the
header mounted yet.

73,
Don W3FPR

> -----Original Message-----
>
> I've reached the resistance checks for the front panel on page 28 of the
> manual, and things do not appear to be going well.
>
> I do have the KSB2 kit, so I have installed the front panel parts
> from that
> kit, as directed on page 28 of the K2 manual. I've attempted to
> inspect for
> solder bridges, cold solder joints, and unsoldered components,
> but I'm very
> much a software guy, and don't have a great deal of confidence in my
> inspection abilities.
>
>

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