[Elecraft] K2 Assembly Problems

[DW Holtman]

Hello,

I posted this a few days ago. I will cut and paste here again.

""I'm in the middle of building a K2, S/N 6412.

While doing the Alignment and test Part 1, I had a couple of readings that 
were not in specs.

1. Page 48, Setting the AGC Threshold, the manuals calls for adjusting  R-1 
for a reading of 3.80VDC on pin 5 of U2. The highest R1 would adjust to is 
3.60VDC.

2.  Page 48 Bargraph Current test. The manual calls for a current reading of 
0.16 to 0.18. My K2 reads 0.25 amps. That is quite a bit higher than what is 
called for.""

I received suggestions to check the voltage on the 8 volt regulator in the control board. It is just as suggested, the voltage is almost 1/2 volt low. Will a 7808 work? Is it the same as a LM2930T-8? They  both have the same NTE cross reference and are available locally.

I finally got around to reassemble for alignment part II. Some times, when it turns on, nothing happens, no display on the LCD, none of the controls do anything. After I turn it off and on a couple of times, it starts working as it is suppose to. This also happened in the first section for alignment where I had the problems listed above, I thought it was the memory initializing. This is not the case, it is still doing the same thing. Would the low 8 Volts cause the MCU to hang up?


Thank you for your help.

Best,
DW Holtman
WB7SSN