My KDSP2 has been working fine up until today when I cracked open the lid of the K2 to perform a VFO dial calibration. At some point during the process, I noticed that the KDSP2's LED was staying on. I figured I must have bumped something, so I tried cycling the K2 on and off and re-seating the KDSP2 module (several times). No luck, the LED stays on and when I issue KDSP2 commands the K2 reports "not inst" or something like that.
I can't imagine what I did to knock it out, but any trouble shooting tips would be appreciated.
The KDSP2 manual's troubleshooting sections says to "check U1 and D3" but I'm not sure what I'm supposed to be checking them for.
Unless you unseated the DSPx module (the one on top), it is not likely
that you did anything overt to create that problem. Treat it as a new
problem that just happened to appear.
It could be a solder connection that was marginal, or it could be that
one of the pins of the KDSP2 U1 IC became oxidized. Try re-seating U1
to clean off any oxidation by the wiping action that results.
If that does not help, try re-flowing the soldering on the KDSP2 with a
hot (750 degF) soldering iron.
The KDSP2 will report Not Installed as long as the LED is lit, so
getting the reset signal to flow out of the KDSP2 firmware and through
the DSPx module is the first step. Make certain the DSPx module is
placed properly in the sockets on the lower board and none of the DSPx
pins are bent.
On 3/21/2014 3:38 PM, Brian - N5BCN wrote:
> My KDSP2 has been working fine up until today when I cracked open the lid of
> the K2 to perform a VFO dial calibration. At some point during the process,
> I noticed that the KDSP2's LED was staying on. I figured I must have bumped
> something, so I tried cycling the K2 on and off and re-seating the KDSP2
> module (several times). No luck, the LED stays on and when I issue KDSP2
> commands the K2 reports "not inst" or something like that.
U1 Pins 15-19 and 27 are not used, so whatever voltage they may be at is
not likely to be causing any problem.
Yes, the DSPx module does draw a bit of current, so it will normally
produce some heat. Just how much is difficult to say via email. While
it may be warm, it should not be uncomfortable to touch for 30 seconds
Do you mean U3 on the main DSP2 board? That is the clock module, and it
is soldered in. The only socketed device on the KDSP2 is U1. I doubt
that U3 would cause a problem other than bad timekeeping.