[Elecraft] need help on ssb module k2

[Don Brown]

Hi

If the SSB module is not communicating with the K2 then the problem is so=
mething with the AUX buss or the MPU on the SSB module. You may have a ba=
d or un-programmed MPU or the ceramic resonator may be bad. If you have a=
 scope look at pin 10 of the MPU and you should see a burst of 4 mhz sine=
 wave at about 5 volts each time you press the mode button on the front p=
anel. If not you may have a bad resonator. Look at pin 28 (AUX buss) and =
you should see data pulses each time you press the mode button. If not yo=
u may have a bad connection in the AUX buss circuit from the K2. The AUX =
buss wakes up this MPU so it can make needed changes on the SSB board whe=
n something is changed on the front panel then the MPU goes to sleep, so =
the clock signal on pin 10 is only there for a few milliseconds.

Don Brown
KD5NDB

----- Original Message -----
From: ken cubilo electric
Sent: Sunday, October 06, 2002 5:23 PM
To: George, W5YR
Cc: elecraft@mailman.qth.net
Subject: Re: [Elecraft] need help on ssb module k2

Hi George yes I sure did
ken w8ob

"George, W5YR" wrote:
> =20
> Did you remove the capacitor that bridges the SSB module?
> =20
> 73/72, George
> Amateur Radio W5YR -  the Yellow Rose of Texas
> In the 57th year and it just keeps getting better!
> Fairview, TX 30 mi NE of Dallas in Collin county EM13qe
> K2 #489      Icom IC-765 #2349     Icom IC-756 PRO  #2121
> =20
> ken cubilo electric wrote:
> >
> > I have just installed the ssb module in k2 #2864 and find that the ri=
g
> > refuses to recognize the module as being connected. I have checked ou=
t
> > all circuit wiring and eliminated the obvious such as IC's backwards,
> > diodes etc. I find measuring voltages on U1 that they appear pretty m=
uch
> > normal except for pin 14 which should be 6.0 v is a big fat zero. Do =
I
> > have a mentally handicapped  MCU here? any suggestions would be
> > appreciated.
> > thanks
> > ken w8ob
> >


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