[Elecraft] troubleshooting elecraft k1 voltage checks

[E Neubauer]

Woops.  Sorry.  I meant to say I got the correct voltage for pin 16.  All others in the chart are at <.1 V. ================

> Date: Sat, 6 Jun 2009 21:24:44 -0400
> From: w3fpr at embarqmail.com
> To: doublehelix454 at hotmail.com
> CC: elecraft at mailman.qth.net
> Subject: Re: [Elecraft] troubleshooting elecraft k1 voltage checks
> 
> Ed,
> 
> I am not certain how you have 5.8-6.2 volts at P1 pin 15 and zero volts 
> at P1 pin 16.
> 
> The number of components you have installed at this point is not large, 
> so I suggest you trace the voltage from the input.  Check the following 
> points in order (stop when you find one that is substantially lower than 
> I indicate because further checking is futile).  I will assume a 12 volt 
> power source for the initial readings so adjust anything that I have 
> indicated 12 volts as expected for your actual supply voltage.
> It may be helpful for you to follow along in the schematic to see "what 
> is connected to which".
> 
> The center of the coaxial power jack (J4) - expect 12 volts
> The anode of D16 - expect 12 volts
> The cathode of D16 - expect 12volts minus 0.3 volts
> Both ends of the RFC8 position on the bottom of the board (RFC8 is a 
> jumper at this point) - expect 12v minus 0.3v.
> The "IN" pin of U5 - expect 12v minus 0.3 volts
> The "OUT" pin of U5 - expect 7.5 to 8.5 volts
> The "IN" pin of U6 - Expect same as above
> The "OUT" pin of U6 - expect 5.8 to 6.2 volts.
> 
> If all those are correct (these are the voltage sources), check the 
> soldering at the U6 "OUT" pin and U3 pin 6, and check the soldering at 
> P1 pin 16.
> 
> 73,
> Don W3FPR
> 
> 
> E Neubauer wrote:
>> Hello:
>> I am in the midst of building the rf board for the K1.  All went well until page 30 in the manual.  
>> I performed the voltage checks and the only one that works is the one at p1 pin 15.  The others read "zero" on my DMM.  I rechecked all soldering - no solder bridges or cold joints.  I went back to the beginning of the rf board assembly and double checked every component's installation and orientation - all fine.
>>
>> Has anyone got suggestions about where to start to diagnose the problem?   Thanks very much.
>> Ed
>>   
>>

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