[Elecraft] K2 #7415 Build Issues

[Glenn Haffly]

I am up to page 63 of the manual which is the alignment and test part 2.

Upon initial testing there is a problem with all of the Bank 1 push
buttons. There is no effect on any of the left push buttons. The right push
buttons on Bank 2 work except for the mode switch and rate / lock switch.
All rotary switches and the encoder appear to work as the display shows the
changes. All tests on Alignment Part 1 went well with no issues.

So far , I have rechecked the entire front panel board and control boards.
All of the resistor packs are correctly installed as well as all diodes ,
transistors and IC's. Soldering was rechecked and connections
reflowed. On the control board I am getting 8 volts on U4 and 5 volts on
U5. U6 on the control board , MCU, there are two voltages wrong. Pins 18
and 25 both should be zero volts. Both measure 5 volts. There is also an
issue with U2 on the control board. Pin 8 is correct at 8 volts and pin 4
is correct with zero volts. All other pins are approximately 1/2 of
what they should be. Pins 1 , 2, 3, 5 , 6 and 7 are all approximately 3.8
volts.
U1 on the RF board voltages are correct.

 I could use some guidance on where to begin.

Glenn
K5ZE