K2 KIO2 Problem.

[Chuck Gehring]

K2 KIO2 Problem.  

A few days ago we had a power fluctuation in our neighborhood.  The surge
protector and Battery Backup UPS did not help.  The Power surge took out my
computer hard drive, serial interface card and it would appear had some
affect on my KIO2.

 

The KIO2 still works with my KAT-100 and KPA 100 Change Bands and Tune, but
I cannot make any connection with the computer serial interface card.  I
have run the Serial interface Test several times.  Of course I replaced the
serial card and hard drive, I even switched computers, NO JOY.

 

I have checked all of the voltages on the KIO2 interface.  The voltages on
the J2, Q1, U2 all match the manual.  The diodes (D1, D2 and D3) seem okay
but I don't get an exact match with the manual.  The voltages on the U1 and
J1 don't match the trouble shooting instructions;

 

U1-1    13.6 VDC                                            

U1-2    0 VDC                        

U1-3    0 VDC                        

U1-4    0 VDC                        

U1-5    0VDC                          

U1-6    0VDC                          

U1-7    0VDC                          

U1-8    9VDC  

U1-9    0VDC

U1-10  0VDC  

U1-11  4.9 VDC

U1-12  5 VDC

U1-13  4.9 VDC

U1-14 0VDC

U1-15 5 VDC

U1-16 5VDC

 

J1-1 0VDC

J1-2 -6 VDC

J1-3 0VDC

J1-4 OVDC

J1-5 0VDC

J1-6 5.5 VDC

J1-7 0VDC

J1-8 14VDC

J1-9 8VDC

 

Comments, suggestions would be appreciated

73 K2CG

Chuck Gehring

 

P.S. I really feel so lucky to have an Elecraft K2.  A friend of mine has a
IC-756PROIII,  He got hit with a voltage spike last month and after several
hundred dollars for replacement boards he still has to send his entire rig
back the service center.  I am very close to talking him in to buying a K2.
At least that way he will have a Back-up rig for his K2 when the Icom gets
back.

 

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[Don Wilhelm-3]

Chuck,

One can only guess at the root cause, but for starters I would suggest
checking the continuity on the miniature RF Chokes in the KIO2.

If all looks well there, try changing the MAX1406 chip (U1).

I am assuming you are using a remote KPA100 - the control for the KAT100 and
the KPA100 do not use the same lines as the computer interface (that is why
a special cable is required at the K2 end of the computer link).  Only the
serial interface signals (RXD and TXD) flow through the MAX1406 (CMOS to
RS-232 level converter is the function of the MAX1406).

As for the voltages on U1, only signal pins 5,6 and 11,12 are used, and I
would expect something other than 0 volts at pin 5 based on a +5 volt
nominal signal at pin 12., so I susspect your MAX1406 chip may be bad, but
check the inductors first.

73,
Don W3FPR

> -----Original Message-----
>
> K2 KIO2 Problem.
>
> A few days ago we had a power fluctuation in our neighborhood.  The surge
> protector and Battery Backup UPS did not help.  The Power surge
> took out my
> computer hard drive, serial interface card and it would appear had some
> affect on my KIO2.
>
>
>
> The KIO2 still works with my KAT-100 and KPA 100 Change Bands and
> Tune, but
> I cannot make any connection with the computer serial interface card.  I
> have run the Serial interface Test several times.  Of course I
> replaced the
> serial card and hard drive, I even switched computers, NO JOY.
>
>

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