K3 won't shut off, turns on by itself

Please help. Last night my K3 worked perfectly. Power supply voltage 14volts and
always shut off after rig.  This morning, turned on power supply, k3 turns on by itself.
Pushing the power button only blanks the screen, display backlighting stays on.  What can
cause this, tried unplugging everything then repeating, same result.  Please help, love
the rig. Serial 4548.   Looking forward to your reply, Coy K3FO
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[Don Wilhelm-4]

Coy,

That sounds like something is pulling the ACC connector pin 8 to ground
(see Remote Power On in the manual).
I would remove everything from the ACC connector as a quick test. If
that does not stop it you will have to contact Elecraft support, but if
it powers on normally with nothing plugged into the ACC connector, you
will have to check your cables and other equipment carefully.

73,
Don W3FPR

On 1/5/2013 9:58 AM, [hidden email] wrote:
> Please help. Last night my K3 worked perfectly. Power supply voltage 14volts and
> always shut off after rig.  This morning, turned on power supply, k3 turns on by itself.
> Pushing the power button only blanks the screen, display backlighting stays on.  What can
> cause this, tried unplugging everything then repeating, same result.  Please help, love
> the rig. Serial 4548.   Looking forward to your reply, Coy K3FO
>

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[Dr. William J. Schmidt, II]

Mine does the same thing except only when the PR6 (six meter preamp with the
"ON" control jumper in the correct position for the K3) control is plugged
into the ACC jack.  I surmise that that possibly D4 (the diode that was
added for the reported MOD:
http://www.elecraft.com/K3/mods/KPA3_12V_Sense_Modification_Rev_B.pdf ) is
bad... and they may have had a bad batch of them...  I've not had time to
take the radio apart and diagnose this completely.  It should not hurt the
radio to use it as is though.  What you can do is remove the fan panel (4
screws on the back) and measure the voltage at pin 11 of connector P68A
after you have turned off the radio.  If it's more than 0.6 VDC the diode is
bad.

<<<
Please help. Last night my K3 worked perfectly. Power supply voltage 14volts
and always shut off after rig.  This morning, turned on power supply, k3
turns on by itself.
Pushing the power button only blanks the screen, display backlighting stays
on.  What can cause this, tried unplugging everything then repeating, same
result.  Please help, love
the rig. Serial 4548.   Looking forward to your reply, Coy K3FO
>>>

Dr. William J. Schmidt - K9HZ / J68HZ/ 8P6HK/ ZF2HZ/ PJ4HZ

Owner - Operator
Big Signal Ranch
Staunton, Illinois

email:  [hidden email]



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