[Elecraft] RS232 KPA 100 Problems

[Andrew UK]

Don Wilhelm-4 (via Nabble) wrote:
> Andrew,
>
> Check the base K2 first.
> First of all, if your K2 is less than SN 3000, you must have the
> sidetone source mod on the Control Board.  It is easy to check - if that
> mod is installed, there will be a wire to P4 pin 1 that you can see
> without removing the Control Board.
> Next, check to see if you have sidetone on that K2 - the sidetone source
> must be U8-4.
> Also be certain PORT is set to ON in the secondary menu.
>
> Having finished those preliminaries, it is time to drag out the 'scope,
> but first you need some signal source at the RS-232 connection.  It is
> easiest if you use a software application that continuously polls the K2
> in an attempt to connect.  I have the N2PK software which continuously
> tries until it is closed.  HRD tries to connect for a bit and then gives
> up, so your 'scoping time is limited to the time the application tries
> to connect.
>
> What should you see - on the MAX1406 chip pin 6 you should see the input
> RXD signal coming from the computer.  It should swing between more than
> 3.5 volts positive to more negative than 3.5 volts.
> If that is present, then the input signal is getting to the chip - if
> not, check the inductor RFC7 or the computer cable.
> That RXD input signal should result in a signal out of U4 at pin 11
> which has the dame data pattern and swings from 0 volts to +5 volts.  
> That same signal should get to the K2 control Board U6 pin 26.
>
> OK, that is the received data part.  Upon receiving data, the transmit
> data should be generated by Control Board U6 and come out at pin 25 with
> a voltage swing between zero and +5 volts.
> That signal should make its way to KPA100 U4 pin 12.
> The MAX1406 converts the levels to RS-232 and the TXD signal should come
> out of U4 pin 5 with both a negative and positive voltage swing - goes
> through  RFC6 and should be sent on to the computer.
>
> So now you know the 'full story' - good luck with the 'scoping.
>
> 73,
> Don W3FPR
>
> Andrew UK wrote:
>
> Hi Don,
>
> I was thinking along those lines, I was hoping the K2 could put put a 
> constant test data stream for me to treace, ok will connect a PC with 
> N2PK software, My serial numberis over 5000, but I lost the plate, I 
> will order a new one.
>
> I will let you know the ourcome.
>
> 73's
>
> Andrew>


> Hi,
> >
> > After 3 years I decided to use my RS232 interface, however it does 
> not work,
> > I measured the voltages and only had -1 volt on pin 8!!! I thought 
> the Max
> > 1406 maybe faulty so change it and also fitted an ic socket, still 
> -1 volt
> > and -2.5 with the ic removed. fault traced to C38 it was cracked! 
> replacing
> > this I now have -12 Volts. However still no comms. I am using the 
> correct
> > elecraft lead.
> >
> > PC works with an FT847 using a null modem lead so the PC serial port is
> > working.
> >
> > can anyone (Help Don)  give me some guidence to fault find, if I 
> scoped TXD
> > going in to the Max 1406 what should I expect?
> >
> > 73's
> >
> > Andrew
> >  
> >  
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