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

[Benjamin Schmid]

Hi Don,

Replacing the resonator had no effect.
I ordered a new Filter Board IC which I received today.

Now everything works as supposed to and I was able to finalize alignment and Test Part 1.
Now I am off building again.

Thanks for your help!

73 de DG5WJ - Benny
————————————————————————
 

Mail: BennySchmid at icloud.com


> Am 23.12.2014 um 21:54 schrieb Don Wilhelm <don at w3fpr.com>:
> 
> Benny,
> 
> The voltage at U1 pin 16 may be OK - that is one of the resonator pins and can be loaded by your DMM.  That is what makes it read as unstable.
> 
> For some reason, the K2 MCU is not communicating with the band board firmware.
> Check all the soldering again, and if that does not resolve itself, obtain a replacement filter board firmware IC *and* obtain a replacement resonator (Z1) just in case that one is defective.
> If you happen to have a spare 4 MHz resonator on hand, try replacing Z1 - that could possibly be the entire problem.  You never know until you try it.
> 
> 73,
> Don W3FPR
> 
>> On 12/23/2014 12:53 PM, Benjamin Schmid wrote:
>> Hi Don,
>> 
>> thanks for your help.
>> 
>> I did the troubleshooting steps:
>> - Turning the K1 off and on again ->  no effect. No relays clicking on startup.
>> 
>> - FIL-U1 is installed correct (notch to the rear), no bent pins, checked the soldering of the socket.
>> The manual states that FIL U1 may be defective. I just wanted to clear out other possibilities before ordering a replacement.
>> 
>> - With power on I  checked the voltages at FIL U1 and FP U1 according to the voltages table.
>> All Fil U1 voltages except 16 are within range. As stated before U1 pin 16 Voltage is unstable between below 0.3V to 1.6V
>> All MCU voltages are within range except Pin 6. Just measured 1.9V there should be 2.5V
>> 
>> Power consumption is at 66mA with no audio output and the LCD backlight (bright version) installed.
>> 
>> Thanks again for your time.
>> 
>> 
>>>> Be certain all pins of the headers to the filter board are well soldered.
>>>> If the band board firmware (U1) is plugged in backwards, you will have low voltage on pin 16 and the regulator will get hot.  The notch on U1 must point toward the rear of the board.
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>