[Elecraft] FW: FW: [K2] K2 - CONTROL PANNEL FREEZE UP (K7CJA) U6 MEASUREMENTS

[Don Wilhelm]

Chris,

The 4.92 volts on U6-30 is good - that was the one you reported as zero 
or very low, and is what prompted me to ask you to measure the 
resistances.  I think you had an incorrect resistance reading from RP4 
pin 5 to U6 pin 30.  There should be nothing between those points but PC 
traces, so you might want to check again.
Re-check the voltage at U6-30 after restoring R1 - if it is still near 5 
volts, then all is OK.

73,
Don W3FPR

CJA wrote:
> Don:
>
> Thought that I might be using the wrong address so I figured that I would
> try this one.  Please see blow for my last measurements.  Thanks.  Chris.
>
> -----Original Message-----
> From: Chris Amyes [mailto:amyescj at earthlink.net] 
> Sent: Thursday, November 05, 2009 7:45 PM
> Subject: RE: FW: [Elecraft] [K2] K2 - CONTROL PANNEL FREEZE UP (K7CJA) U6
> MEASUREMENTS
>
> Don:
>
> Before removing the CB I checked U6-30 and got 4.92V.  I then removed the CB
> and checked the following:
>
> RP4 Pins 5&6:  Soldering ok. Resistance 81.7K
> U6-30 & RP-6/5:  Resistance is 90.6k (NOT close to ZERO)
> U5 TOP & RP4/6: 0.000
>
> NOTE: R1 on RFB Lifted
>
> BTU, 73
>
> Chris
>   
>