Hi Guys,
I am building a K2 for a friend. I am at the first power test point in
the manual. The K2 has no display and no relays clicking on power up. I
have checked the basics and here is what I have found so far:
I have gone over the front panel board, control board and RF boards with
my optivisor magnifier. All solder connections look good. All the
initial resistance tests on the boards checked out. I am finding the 5
volt regulator on the control board U5 is only putting out 1.2 volts on
the output. The input is reading 13.5 volts. The input on U4 has 13.5
volts and 8 volts output. Can I unplug the control board and power up
the 5 volt regulator by applying 13 volts to the input to the 5 volt
regulator with the control board un-plugged without hurting anything? I
suspect the 5 volt regulator is defective or something else is dragging
the voltage down. The 5 volt regulator is verified as a L7805 installed.
When the K2 was first powered up the relays started to click and then it
went dead. I am getting power through the resettable fuse and through
the power switch.
This is the first time I have had a major problem with an Elecraft kit.
I have built most all of the Elecraft products without a hitch.
Any help would be appreciated.
Thanks in advance,
Glenn Maclean WA7SPY
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