[Elecraft] K2 Problem Test Part 1

[andy]

Hello,
 
I'm Andy DL 1 XAS building up the K2 with the Nr 6345.
 
I built up the control unit, the front panel unit, and the parts from RF
board. The resistor tests before were succesful.
 
Then  the first test on page 43 should be done.
 
 
The test started very good:  the Elecraft and the 7.1000.00 c appears
correct.
 
And the annunciator for the VFO A were turned on. But also the annunciator
for the PRE turned on. But  the next test tapping the DISPLAY switch didn't
work(no switching) Also VFO knob and Band switch or Rate switch didn't work.
 
So I checked all the units for correct soldering and parts, I didn't find a
mistake.
 
Then I checked the voltage from U2 on Front panel board, and I saw that at
PIN 5 there were no 5 Volts, which should be there. But when I pressed the
BAND down switch the voltage went to 4 Volts. I bought a new 74HC165N and
changed it, but nothing changed. Mistake must be at another point.
 
I also checked the U2 on control unit, and there I found out, that instead
of 6.9 V there only were between 2 and 4 Volt, depending changing the R1
trimmer.(The reason for the band switches don't work?)
 
But the voltage from  U4 (8V) and U5 (5V)  were okay.
 
so, I would be very glad, if anyone can help me for finding the problem, so
that i can go on building my K2  :-)
 
73 from the region of Hamburg
 
Andy, DL 1 XAS


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