[Elecraft] [K1] Error27 - Alignment and Test Part 1

[Richard S. Leary]

Benny,
I just finished my basic K1, Serial Nr 3342, with the first filter board
(20m/15m). I'm amazed at how well it went. No missing parts. Every jack &
plug fits with laser precision. All resistance & voltage measurements fell
right on, or midrange between the manuals listed parameters. I'd go back and
recheck everything. Also make sure the small mini switch (oper/cal) on the
bottom of the RF board is in the "OPER" position. It makes a difference when
checking the U8 pin 1 and pin 8 voltages. All alignment procedures went as
stated in the manual. My VFO range is 80Khz and I ended up taking ONE turn
off of coil L1 to get it down to 3.095Khz. Actual range is 84Khz. Using my
SteppIR DB-18 ant my first contact was with a station in Spokane, WA on
20mtrs. Later my 2nd contact was with a station in New London, CT. An actual
QSO with names, rigs, etc. Lasted 17 minutes. Power = 3W. Now to start the
2nd filter board (17/30 meters).
Thank you Elecraft and Merry Christmas and a Happy New Year to All.

-----Original Message-----
From: Elecraft [mailto:elecraft-bounces at mailman.qth.net] On Behalf Of
Benjamin Schmid
Sent: Tuesday, December 23, 2014 02:02
To: elecraft at mailman.qth.net
Subject: [Elecraft] [K1] Error27 - Alignment and Test Part 1

Hi everybody, 
 
I'm currently in the middle of building my K1 #3343. 
Right until now everything went just fine and it's been fun to build.
 
I'm at the point of the first power up and wanted to test the ATTN relay.
 
The LED comes on but there ist no relay clicking.
When hitting BAND I realized that band change wasn't possible and the TRX
shows E27.
 
The filter board is completely plugged in and seated correctly.
Off to the manual then. Have you tried turning it off an on again: yes.
No relay clicking on power up. Until then i thought that was normal.
 
I checked the orientation of Fil-U1. Its positioned correct and completely
in the socket, no bent pins etc..
I checked the voltages of Fil-U1 everything within the specified range. 
I checked some voltages at the MCU, not all yet, all within range or as
specified in the manual. 
 
I read some older posts abt similar problems. I checked Fil-R1. It's the
correct value and the solder joint seems good.
I followed the hole path of the aux bus signal from Fil-U1 Pin13 up to the
MCU. Resistance is just the 100ohm of Fil-R1. 
I redid some solder connections on the way even though they looked good, as
well as all solders on all multi pin connectors. 
On the FP-Board FP-RFC1 is the correct value, solder joints looks ok. (It's
not a resistor)
 
 
Kept reading some older posts and checked the coil resistance of all relays,
all about the same resistance (not sure about the actual value right now) ,
soldering and position of all relays ok. 

 
Right now i redid some voltage measurements. 
I found out that the voltage at FIL-U1-16 is somewhat unstable. The first
time i measured it was well below 0.3V.
This time it was around 0.6 Volts, a couple seconds later around 1.3 V while
Pin 15 is at flat 0.0V as it was before.
 
Not sure what's that supposed to tell me. Did I fry Z1 while soldering? Or
is it U1 itself causing the trouble?
 
 
 
Any ideas are much appreciated!
Thanks in advance and happy holidays.
 
73 de DG5WJ - Benny 
 
P.S. I sent the same message twice already but somehow they showed up in the
liste without any content. 
So I switched Mail adresses. Sorry for the spam!

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