I have been using my KX1 for the past year or so. This past weekend I
decided to install the KXB3080 option. Performing the checkout step after
the KXB3080 PCB install failed normal operation! Nothing works. My KX1 now
appears to be mostly dead. :-0
I am hoping the collective wisdom of the list can confirm or suggest other
possibilities I should check out to try to revive my KX1. The other thing I
fear is multiple component failures. Please help! I am anxious to return
to the air! (Believe it or not my KX is my station!)
Here is the run down:
The mods to the KX1 PCB (Part 1) went well and passed all the re-alignment
checks.
I installed the KXB3080 PCB fairly easily. (I did have some problems
removing solder from the plated through hole for L7 near R2. Ultimately I
also got solder in the adjacent G through hole as well. I eventually got
these cleared.)
Upon performing the check out step towards the end of the this section (Part
II in the KXB3080 manual) I experienced the following:
Current drain 36mA @ 13V - OK.
LED lit up momentarily, 1 or 2 segments missing, then went dark. (!!)
Subsequent attempts to power up go like this:
NO LED
NO Relay Clicks at power up
Current: 36mA @ 13V
Buttons - unresponsive
White Noise from earphones, volume works
RF Gain and Filter have no affect on the audio
(I did not check RF out.)
I double re-checked the install. No anomalies were noted.
I opened up the trouble shooting section of the KX1 Manual:
Section 00 - all ok
Section 20 - all regulators are right on: 6V, 5V, 2.7V
Section 26 - U1 Voltage Levels (w/i 10%) Measured @ 13V
Pin Spec Meas Pin Spec Meas
1 5.0 5.0 15 0 0
2 5.0 5.0 16 0 0
3 4.6 5.0 17 0 0
4 4.9 5.0 18 0 0
5 4.9 5.0 19 0 0
6 3.4 4.3 << 20 5.0 5.0
7 1.4 0 << 21 5.0 0 <<
8 0 0 22 5.0 4.7
9 .8 .8 23 4.9 4.7
10 .9 .9 24 5.0 4.8
11 0 0 25 5.0 4.8
12 0 0 26 4.7 4.8
13 5.0 5.0 27 5.0 4.8
14 0 5.0 << 28 5.0 4.8
Measurements marked with "<<" are outside the 10% tolerance limit!! Is it
fair to conclude U1 is toast!?!?
At this point I think I probably "fried" U1 during the install. Since its
winter and pretty dry in doors I am guessing ESD got it. This despite using
an anti-static mat, ...and wrist strap -- *most* of the time. :(
I am hoping the collective wisdom of the list can confirm or suggest other
possibilities I should check out before replacing U1. The other thing I
fear is that perhaps other components were damaged in the process.
What say you??
Regards, Shawn Morrow
W4SDM
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