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K2 freeze at startup... need advice

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JEAN-FRANCOIS MENARD

K2 freeze at startup... need advice

Hi everybody,

I have my first major trouble since my building experience back in
2004. Now, everytime i power up my K2, I can see ELECRAFT and then the
frequency..... but everything is frozen after...... still get the
frequency displayed, but no button, no function work. I also tried to
reset the K2 to the factory default by holding 4-5-6 buttons..... Got
the 201 message then back to the ELECRAFT and the frequency..... but
still frozen !!!!

Is it possible the the control board PIC got a static discharge or
something like this !?!?!?!

Thanks for your help.

============================
De Jean-François Ménard / VA2SS

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De Jean-François Ménard VA2SS

Don Wilhelm-4

Re: K2 freeze at startup... need advice

Jean,

This is strange - the second case of similar behavior reported on the
reflector today. Could it be a case of the 'phase of the moon'?

When the K2 is in transmit state, the behavior will be as you describe -
no buttons operate but the K2 displays the frequency.

Check to see if your K2 is somehow stuck in transmit. The easiest way
is to check the state of the 8R and 8T voltages. You can checkby
measuring the DC voltage at the anodes of D6 and D7. During receive,
the voltage at D6 anode should be about 8 volts and the voltage at D7
should be near zero volts. If the K2 is 'stuck in transmit', those
voltages will be reversed.

If your K2 is indeed 'stuck in transmit', try removing the key plug and
the microphone - if something external is creating that transmit
condition, it should be OK with those cables unplugged.

73,
Don W3FPR

Jean-François Ménard wrote:

>
>
> Hi everybody,
>
> I have my first major trouble since my building experience back in
> 2004. Now, everytime i power up my K2, I can see ELECRAFT and then the
> frequency..... but everything is frozen after...... still get the
> frequency displayed, but no button, no function work. I also tried to
> reset the K2 to the factory default by holding 4-5-6 buttons..... Got
> the 201 message then back to the ELECRAFT and the frequency..... but
> still frozen !!!!
>
> Is it possible the the control board PIC got a static discharge or
> something like this !?!?!?!
>

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Post to: [hidden email]
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AC7AC

RE: K2 freeze at startup... need advice

CONTENTS DELETED

The author has deleted this message.

JEAN-FRANCOIS MENARD

Re: K2 freeze at startup... need advice

OK, but I have nothing plugged, no key, no mic, nothing. But I will
check 8R and 8T for sure.... I let you know guys.

Thanks for now.

Le 08-09-18 à 23:39, Ron D'Eau Claire a écrit :

> Yep. That happened to me once when I had a short in the key line.
>
> After muttering "mon Dieu!" I started unplugging things and it started
> working
>
> Unplug the key and check again.
>
> Ron AC7AC
>
> -----Original Message-----
> From: [hidden email]
> [mailto:[hidden email]] On Behalf Of Don Wilhelm
> Sent: Thursday, September 18, 2008 8:34 PM
> To: Jean-François Ménard
> Cc: [hidden email]
> Subject: Re: [Elecraft] K2 freeze at startup... need advice
>
>
> Jean,
>
> This is strange - the second case of similar behavior reported on the
> reflector today. Could it be a case of the 'phase of the moon'?
>
> When the K2 is in transmit state, the behavior will be as you
> describe -
> no buttons operate but the K2 displays the frequency.
>
> Check to see if your K2 is somehow stuck in transmit. The easiest way
> is to check the state of the 8R and 8T voltages. You can checkby
> measuring the DC voltage at the anodes of D6 and D7. During receive,
> the voltage at D6 anode should be about 8 volts and the voltage at D7
> should be near zero volts. If the K2 is 'stuck in transmit', those
> voltages will be reversed.
>
> If your K2 is indeed 'stuck in transmit', try removing the key plug
> and
> the microphone - if something external is creating that transmit
> condition, it should be OK with those cables unplugged.
>
> 73,
> Don W3FPR
>
> Jean-François Ménard wrote:
>>
>>
>> Hi everybody,
>>
>> I have my first major trouble since my building experience back in
>> 2004. Now, everytime i power up my K2, I can see ELECRAFT and then
>> the
>> frequency..... but everything is frozen after...... still get the
>> frequency displayed, but no button, no function work. I also tried to
>> reset the K2 to the factory default by holding 4-5-6 buttons..... Got
>> the 201 message then back to the ELECRAFT and the frequency..... but
>> still frozen !!!!
>>
>> Is it possible the the control board PIC got a static discharge or
>> something like this !?!?!?!
>>
> _______________________________________________
> Elecraft mailing list
> Post to: [hidden email]
> You must be a subscriber to post to the list.
> Subscriber Info (Addr. Change, sub, unsub etc.):
> http://mailman.qth.net/mailman/listinfo/elecraft
>
> Help: http://mailman.qth.net/subscribers.htm
> Elecraft web page: http://www.elecraft.com
>

============================
De Jean-François Ménard / VA2SS

_______________________________________________
Elecraft mailing list
Post to: [hidden email]
You must be a subscriber to post to the list.
Subscriber Info (Addr. Change, sub, unsub etc.):
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Elecraft web page: http://www.elecraft.com

De Jean-François Ménard VA2SS

JEAN-FRANCOIS MENARD

Re: K2 freeze at startup... need advice

In reply to this post by Don Wilhelm-4

It seems that something let my K2 stuck in TX mode. I removed all
module and put appropriate jumpers (unmod kit). Still in TX when
powered ON. I checked this using my DL2 dummy load with my
multimeter.... I always have output power !!

Could it be a defective KEY jack that is jammed? I have nothing
plugged......

Le 08-09-18 à 23:33, Don Wilhelm a écrit :

> Jean,
>
> This is strange - the second case of similar behavior reported on
> the reflector today. Could it be a case of the 'phase of the moon'?
>
> When the K2 is in transmit state, the behavior will be as you
> describe - no buttons operate but the K2 displays the frequency.
>
> Check to see if your K2 is somehow stuck in transmit. The easiest
> way is to check the state of the 8R and 8T voltages. You can
> checkby measuring the DC voltage at the anodes of D6 and D7. During
> receive, the voltage at D6 anode should be about 8 volts and the
> voltage at D7 should be near zero volts. If the K2 is 'stuck in
> transmit', those voltages will be reversed.
>
> If your K2 is indeed 'stuck in transmit', try removing the key plug
> and the microphone - if something external is creating that transmit
> condition, it should be OK with those cables unplugged.
>
> 73,
> Don W3FPR
>
> Jean-François Ménard wrote:
>>
>>
>> Hi everybody,
>>
>> I have my first major trouble since my building experience back in
>> 2004. Now, everytime i power up my K2, I can see ELECRAFT and then
>> the frequency..... but everything is frozen after...... still get
>> the frequency displayed, but no button, no function work. I also
>> tried to reset the K2 to the factory default by holding 4-5-6
>> buttons..... Got the 201 message then back to the ELECRAFT and the
>> frequency..... but still frozen !!!!
>>
>> Is it possible the the control board PIC got a static discharge or
>> something like this !?!?!?!
>>

De Jean-François Ménard VA2SS

Geoffrey Mackenzie-Kennedy

Re: K2 freeze at startup... need advice

In reply to this post by JEAN-FRANCOIS MENARD

Try removing and reseating the MCU (U6) on the Control Board before
switching on, this will clean the contacts and could solve your problem.

I have had the same problem with my K2.

73,
Geoff
GM4ESD

Jean-François Ménard wrote on Friday, September 19, 2008 2:55 AM

> Hi everybody,
>
> I have my first major trouble since my building experience back in
> 2004. Now, everytime i power up my K2, I can see ELECRAFT and then the
> frequency..... but everything is frozen after...... still get the
> frequency displayed, but no button, no function work. I also tried to
> reset the K2 to the factory default by holding 4-5-6 buttons..... Got
> the 201 message then back to the ELECRAFT and the frequency..... but
> still frozen !!!!
>
> Is it possible the the control board PIC got a static discharge or
> something like this !?!?!?!
>
> Thanks for your help.
>
> ============================
> De Jean-François Ménard / VA2SS

Don Wilhelm-4

Re: K2 freeze at startup... need advice

In reply to this post by JEAN-FRANCOIS MENARD

Jean-Francois,

It certainly could be a faulty key jack, but it could be a
microprocessor problem too.
Turn the power down to zero for further testing.
Then check the voltage at the end of R1 and R2 near the key jack - they
are easy to reach if you remove the left side panel. The voltage should
be near 5 volts if there is nothing pulling those inputs down.
Remember that the DOT line and the PTT line are one and the same on the
K2, so if that line is low the problem nay be in the key jack or on the
Front Panel board.

Should you find either the DOT or DASH lines near zero volts, turn power
off and make resistance checks to find out if there is a short (maybe a
solder bridge that has been dormant for a long time). Those signal
lines run direct to the microprocessor, so there is only the jacks, PC
traces, and the microprocessor involved.

73,
Don W3FPR

Jean-François Ménard wrote:

> It seems that something let my K2 stuck in TX mode. I removed all
> module and put appropriate jumpers (unmod kit). Still in TX when
> powered ON. I checked this using my DL2 dummy load with my
> multimeter.... I always have output power !!
>
> Could it be a defective KEY jack that is jammed? I have nothing
> plugged......
>
>
> Le 08-09-18 à 23:33, Don Wilhelm a écrit :
>
>> Jean,
>>
>> This is strange - the second case of similar behavior reported on the
>> reflector today. Could it be a case of the 'phase of the moon'?
>>
>> When the K2 is in transmit state, the behavior will be as you
>> describe - no buttons operate but the K2 displays the frequency.
>>
>> Check to see if your K2 is somehow stuck in transmit. The easiest
>> way is to check the state of the 8R and 8T voltages. You can checkby
>> measuring the DC voltage at the anodes of D6 and D7. During receive,
>> the voltage at D6 anode should be about 8 volts and the voltage at D7
>> should be near zero volts. If the K2 is 'stuck in transmit', those
>> voltages will be reversed.
>>
>> If your K2 is indeed 'stuck in transmit', try removing the key plug
>> and the microphone - if something external is creating that transmit
>> condition, it should be OK with those cables unplugged.
>>
>> 73,
>> Don W3FPR
>>
>> Jean-François Ménard wrote:
>>>
>>>
>>> Hi everybody,
>>>
>>> I have my first major trouble since my building experience back in
>>> 2004. Now, everytime i power up my K2, I can see ELECRAFT and then
>>> the frequency..... but everything is frozen after...... still get
>>> the frequency displayed, but no button, no function work. I also
>>> tried to reset the K2 to the factory default by holding 4-5-6
>>> buttons..... Got the 201 message then back to the ELECRAFT and the
>>> frequency..... but still frozen !!!!
>>>
>>> Is it possible the the control board PIC got a static discharge or
>>> something like this !?!?!?!
>>>
>
> ============================
> De Jean-François Ménard / VA2SS
>
>
> ------------------------------------------------------------------------
>
>
> No virus found in this incoming message.
> Checked by AVG - http://www.avg.com
> Version: 8.0.169 / Virus Database: 270.7.0/1680 - Release Date: 9/19/2008 8:25 AM
>
>

JEAN-FRANCOIS MENARD

Re: K2 freeze at startup... need advice

It seems that a resistence check on the control board give me a
hint..... U6 PIN 29 are inside spec, but PIN 30 give me only 16K ohm
and should be higher... around 80K ohm to 90k

The key jack seems to be good, R1 and R2 are OK.

Re-insert controler on RF board, nothing change

Le 08-09-19 à 08:11, Don Wilhelm a écrit :

> Jean-Francois,
>
> It certainly could be a faulty key jack, but it could be a
> microprocessor problem too.
> Turn the power down to zero for further testing.
> Then check the voltage at the end of R1 and R2 near the key jack -
> they are easy to reach if you remove the left side panel. The
> voltage should be near 5 volts if there is nothing pulling those
> inputs down.
> Remember that the DOT line and the PTT line are one and the same on
> the K2, so if that line is low the problem nay be in the key jack or
> on the Front Panel board.
>
> Should you find either the DOT or DASH lines near zero volts, turn
> power off and make resistance checks to find out if there is a short
> (maybe a solder bridge that has been dormant for a long time).
> Those signal lines run direct to the microprocessor, so there is
> only the jacks, PC traces, and the microprocessor involved.
>
> 73,
> Don W3FPR
>
>
> Jean-François Ménard wrote:
>> It seems that something let my K2 stuck in TX mode. I removed all
>> module and put appropriate jumpers (unmod kit). Still in TX when
>> powered ON. I checked this using my DL2 dummy load with my
>> multimeter.... I always have output power !!
>>
>> Could it be a defective KEY jack that is jammed? I have nothing
>> plugged......
>>
>>
>> Le 08-09-18 à 23:33, Don Wilhelm a écrit :
>>
>>> Jean,
>>>
>>> This is strange - the second case of similar behavior reported on
>>> the reflector today. Could it be a case of the 'phase of the moon'?
>>>
>>> When the K2 is in transmit state, the behavior will be as you
>>> describe - no buttons operate but the K2 displays the frequency.
>>>
>>> Check to see if your K2 is somehow stuck in transmit. The easiest
>>> way is to check the state of the 8R and 8T voltages. You can
>>> checkby measuring the DC voltage at the anodes of D6 and D7.
>>> During receive, the voltage at D6 anode should be about 8 volts
>>> and the voltage at D7 should be near zero volts. If the K2 is
>>> 'stuck in transmit', those voltages will be reversed.
>>>
>>> If your K2 is indeed 'stuck in transmit', try removing the key
>>> plug and the microphone - if something external is creating that
>>> transmit condition, it should be OK with those cables unplugged.
>>>
>>> 73,
>>> Don W3FPR
>>>
>>> Jean-François Ménard wrote:
>>>>
>>>>
>>>> Hi everybody,
>>>>
>>>> I have my first major trouble since my building experience back
>>>> in 2004. Now, everytime i power up my K2, I can see ELECRAFT and
>>>> then the frequency..... but everything is frozen after......
>>>> still get the frequency displayed, but no button, no function
>>>> work. I also tried to reset the K2 to the factory default by
>>>> holding 4-5-6 buttons..... Got the 201 message then back to the
>>>> ELECRAFT and the frequency..... but still frozen !!!!
>>>>
>>>> Is it possible the the control board PIC got a static discharge
>>>> or something like this !?!?!?!
>>>>
>>
>> ============================
>> De Jean-François Ménard / VA2SS
>>
>>
>> ------------------------------------------------------------------------
>>
>>
>> No virus found in this incoming message.
>> Checked by AVG - http://www.avg.com Version: 8.0.169 / Virus
>> Database: 270.7.0/1680 - Release Date: 9/19/2008 8:25 AM
>>
>>

De Jean-François Ménard VA2SS

JEAN-FRANCOIS MENARD

Re: K2 freeze at startup... need advice

I also found another thing.....

Resistance check of Pin 7 and 8 of RP4 on the control board give me
81K ohm, but PIN 5 and 6 give me 19K ohm... should be 81K ohm too !!!

Le 08-09-19 à 09:29, Jean-François Ménard a écrit :

> It seems that a resistence check on the control board give me a
> hint..... U6 PIN 29 are inside spec, but PIN 30 give me only 16K ohm
> and should be higher... around 80K ohm to 90k
>
> The key jack seems to be good, R1 and R2 are OK.
>
> Re-insert controler on RF board, nothing change
>
>
> Le 08-09-19 à 08:11, Don Wilhelm a écrit :
>
>> Jean-Francois,
>>
>> It certainly could be a faulty key jack, but it could be a
>> microprocessor problem too.
>> Turn the power down to zero for further testing.
>> Then check the voltage at the end of R1 and R2 near the key jack -
>> they are easy to reach if you remove the left side panel. The
>> voltage should be near 5 volts if there is nothing pulling those
>> inputs down.
>> Remember that the DOT line and the PTT line are one and the same on
>> the K2, so if that line is low the problem nay be in the key jack
>> or on the Front Panel board.
>>
>> Should you find either the DOT or DASH lines near zero volts, turn
>> power off and make resistance checks to find out if there is a
>> short (maybe a solder bridge that has been dormant for a long
>> time). Those signal lines run direct to the microprocessor, so
>> there is only the jacks, PC traces, and the microprocessor involved.
>>
>> 73,
>> Don W3FPR
>>
>>
>> Jean-François Ménard wrote:
>>> It seems that something let my K2 stuck in TX mode. I removed all
>>> module and put appropriate jumpers (unmod kit). Still in TX when
>>> powered ON. I checked this using my DL2 dummy load with my
>>> multimeter.... I always have output power !!
>>>
>>> Could it be a defective KEY jack that is jammed? I have nothing
>>> plugged......
>>>
>>>
>>> Le 08-09-18 à 23:33, Don Wilhelm a écrit :
>>>
>>>> Jean,
>>>>
>>>> This is strange - the second case of similar behavior reported on
>>>> the reflector today. Could it be a case of the 'phase of the
>>>> moon'?
>>>>
>>>> When the K2 is in transmit state, the behavior will be as you
>>>> describe - no buttons operate but the K2 displays the frequency.
>>>>
>>>> Check to see if your K2 is somehow stuck in transmit. The
>>>> easiest way is to check the state of the 8R and 8T voltages. You
>>>> can checkby measuring the DC voltage at the anodes of D6 and D7.
>>>> During receive, the voltage at D6 anode should be about 8 volts
>>>> and the voltage at D7 should be near zero volts. If the K2 is
>>>> 'stuck in transmit', those voltages will be reversed.
>>>>
>>>> If your K2 is indeed 'stuck in transmit', try removing the key
>>>> plug and the microphone - if something external is creating that
>>>> transmit condition, it should be OK with those cables unplugged.
>>>>
>>>> 73,
>>>> Don W3FPR
>>>>
>>>> Jean-François Ménard wrote:
>>>>>
>>>>>
>>>>> Hi everybody,
>>>>>
>>>>> I have my first major trouble since my building experience back
>>>>> in 2004. Now, everytime i power up my K2, I can see ELECRAFT and
>>>>> then the frequency..... but everything is frozen after......
>>>>> still get the frequency displayed, but no button, no function
>>>>> work. I also tried to reset the K2 to the factory default by
>>>>> holding 4-5-6 buttons..... Got the 201 message then back to the
>>>>> ELECRAFT and the frequency..... but still frozen !!!!
>>>>>
>>>>> Is it possible the the control board PIC got a static discharge
>>>>> or something like this !?!?!?!
>>>>>
>>>
>>> ============================
>>> De Jean-François Ménard / VA2SS
>>>
>>>
>>> ------------------------------------------------------------------------
>>>
>>>
>>> No virus found in this incoming message.
>>> Checked by AVG - http://www.avg.com Version: 8.0.169 / Virus
>>> Database: 270.7.0/1680 - Release Date: 9/19/2008 8:25 AM
>>>
>>>
>
> ============================
> De Jean-François Ménard / VA2SS
>
>
>
> _______________________________________________
> Elecraft mailing list
> Post to: [hidden email]
> You must be a subscriber to post to the list.
> Subscriber Info (Addr. Change, sub, unsub etc.):
> http://mailman.qth.net/mailman/listinfo/elecraft
>
> Help: http://mailman.qth.net/subscribers.htm
> Elecraft web page: http://www.elecraft.com

De Jean-François Ménard VA2SS

Don Wilhelm-4

Re: K2 freeze at startup... need advice

Jean-Francois,

Sounds like you are homing in on the problem. Try removing the
microprocessor and measuring the resistance between RP4 pins 5 and 6.
If it is normal (81K), then you have a bad microprocessor input at pin
30. If so, replacement of U6 is the only solution I know about.

73,
Don W3FPR

Jean-François Ménard wrote:

> I also found another thing.....
>
> Resistance check of Pin 7 and 8 of RP4 on the control board give me
> 81K ohm, but PIN 5 and 6 give me 19K ohm... should be 81K ohm too !!!
>
> Le 08-09-19 à 09:29, Jean-François Ménard a écrit :
>
>> It seems that a resistence check on the control board give me a
>> hint..... U6 PIN 29 are inside spec, but PIN 30 give me only 16K ohm
>> and should be higher... around 80K ohm to 90k
>>
>> The key jack seems to be good, R1 and R2 are OK.
>>
>> Re-insert controler on RF board, nothing change
>>
>>
>> Le 08-09-19 à 08:11, Don Wilhelm a écrit :
>>
>>> Jean-Francois,
>>>
>>> It certainly could be a faulty key jack, but it could be a
>>> microprocessor problem too.
>>> Turn the power down to zero for further testing.
>>> Then check the voltage at the end of R1 and R2 near the key jack -
>>> they are easy to reach if you remove the left side panel. The
>>> voltage should be near 5 volts if there is nothing pulling those
>>> inputs down.
>>> Remember that the DOT line and the PTT line are one and the same on
>>> the K2, so if that line is low the problem nay be in the key jack or
>>> on the Front Panel board.
>>>
>>> Should you find either the DOT or DASH lines near zero volts, turn
>>> power off and make resistance checks to find out if there is a short
>>> (maybe a solder bridge that has been dormant for a long time).
>>> Those signal lines run direct to the microprocessor, so there is
>>> only the jacks, PC traces, and the microprocessor involved.
>>>
>>> 73,
>>> Don W3FPR
>>>
>>>
>>> Jean-François Ménard wrote:
>>>> It seems that something let my K2 stuck in TX mode. I removed all
>>>> module and put appropriate jumpers (unmod kit). Still in TX when
>>>> powered ON. I checked this using my DL2 dummy load with my
>>>> multimeter.... I always have output power !!
>>>>
>>>> Could it be a defective KEY jack that is jammed? I have nothing
>>>> plugged......
>>>>
>>>>
>>>> Le 08-09-18 à 23:33, Don Wilhelm a écrit :
>>>>
>>>>> Jean,
>>>>>
>>>>> This is strange - the second case of similar behavior reported on
>>>>> the reflector today. Could it be a case of the 'phase of the moon'?
>>>>>
>>>>> When the K2 is in transmit state, the behavior will be as you
>>>>> describe - no buttons operate but the K2 displays the frequency.
>>>>>
>>>>> Check to see if your K2 is somehow stuck in transmit. The easiest
>>>>> way is to check the state of the 8R and 8T voltages. You can
>>>>> checkby measuring the DC voltage at the anodes of D6 and D7.
>>>>> During receive, the voltage at D6 anode should be about 8 volts
>>>>> and the voltage at D7 should be near zero volts. If the K2 is
>>>>> 'stuck in transmit', those voltages will be reversed.
>>>>>
>>>>> If your K2 is indeed 'stuck in transmit', try removing the key
>>>>> plug and the microphone - if something external is creating that
>>>>> transmit condition, it should be OK with those cables unplugged.
>>>>>
>>>>> 73,
>>>>> Don W3FPR
>>>>>
>>>>> Jean-François Ménard wrote:
>>>>>>
>>>>>>
>>>>>> Hi everybody,
>>>>>>
>>>>>> I have my first major trouble since my building experience back
>>>>>> in 2004. Now, everytime i power up my K2, I can see ELECRAFT and
>>>>>> then the frequency..... but everything is frozen after......
>>>>>> still get the frequency displayed, but no button, no function
>>>>>> work. I also tried to reset the K2 to the factory default by
>>>>>> holding 4-5-6 buttons..... Got the 201 message then back to the
>>>>>> ELECRAFT and the frequency..... but still frozen !!!!
>>>>>>
>>>>>> Is it possible the the control board PIC got a static discharge
>>>>>> or something like this !?!?!?!
>>>>>>
>>>>
>>>> ============================
>>>> De Jean-François Ménard / VA2SS
>>>>
>>>>
>>>> ------------------------------------------------------------------------
>>>>
>>>>
>>>>
>>>> No virus found in this incoming message.
>>>> Checked by AVG - http://www.avg.com Version: 8.0.169 / Virus
>>>> Database: 270.7.0/1680 - Release Date: 9/19/2008 8:25 AM
>>>>
>>>>
>>
>> ============================
>> De Jean-François Ménard / VA2SS
>>
>>
>>
>> _______________________________________________
>> Elecraft mailing list
>> Post to: [hidden email]
>> You must be a subscriber to post to the list.
>> Subscriber Info (Addr. Change, sub, unsub etc.):
>> http://mailman.qth.net/mailman/listinfo/elecraft
>>
>> Help: http://mailman.qth.net/subscribers.htm
>> Elecraft web page: http://www.elecraft.com
>
> ============================
> De Jean-François Ménard / VA2SS
>
>
>
> _______________________________________________
> Elecraft mailing list
> Post to: [hidden email]
> You must be a subscriber to post to the list.
> Subscriber Info (Addr. Change, sub, unsub etc.):
> http://mailman.qth.net/mailman/listinfo/elecraft
> Help: http://mailman.qth.net/subscribers.htm
> Elecraft web page: http://www.elecraft.com
> ------------------------------------------------------------------------
>
>
> No virus found in this incoming message.
> Checked by AVG - http://www.avg.com
> Version: 8.0.169 / Virus Database: 270.7.0/1680 - Release Date: 9/19/2008 8:25 AM
>
>

JEAN-FRANCOIS MENARD

Re: K2 freeze at startup... need advice

You are right!! After U6 removed.... RP4 pin 5 and 6 are now at 81k
ohm!!

U6 must be replaced

Thanks for your help..... But one question remains..... What did
happen to U6 ??

Jean-François Ménard

Le 08-09-19 à 09:52, Don Wilhelm <[hidden email]> a écrit :

> Jean-Francois,
>
> Sounds like you are homing in on the problem. Try removing the
> microprocessor and measuring the resistance between RP4 pins 5 and
> 6. If it is normal (81K), then you have a bad microprocessor input
> at pin 30. If so, replacement of U6 is the only solution I know
> about.
>
> 73,
> Don W3FPR
>
> Jean-François Ménard wrote:
>> I also found another thing.....
>>
>> Resistance check of Pin 7 and 8 of RP4 on the control board give me
>> 81K ohm, but PIN 5 and 6 give me 19K ohm... should be 81K ohm too !!!
>>
>> Le 08-09-19 à 09:29, Jean-François Ménard a écrit :
>>
>>> It seems that a resistence check on the control board give me a
>>> hint..... U6 PIN 29 are inside spec, but PIN 30 give me only 16K
>>> ohm and should be higher... around 80K ohm to 90k
>>>
>>> The key jack seems to be good, R1 and R2 are OK.
>>>
>>> Re-insert controler on RF board, nothing change
>>>
>>>
>>> Le 08-09-19 à 08:11, Don Wilhelm a écrit :
>>>
>>>> Jean-Francois,
>>>>
>>>> It certainly could be a faulty key jack, but it could be a
>>>> microprocessor problem too.
>>>> Turn the power down to zero for further testing.
>>>> Then check the voltage at the end of R1 and R2 near the key jack
>>>> - they are easy to reach if you remove the left side panel. The
>>>> voltage should be near 5 volts if there is nothing pulling those
>>>> inputs down.
>>>> Remember that the DOT line and the PTT line are one and the same
>>>> on the K2, so if that line is low the problem nay be in the key
>>>> jack or on the Front Panel board.
>>>>
>>>> Should you find either the DOT or DASH lines near zero volts,
>>>> turn power off and make resistance checks to find out if there is
>>>> a short (maybe a solder bridge that has been dormant for a long
>>>> time). Those signal lines run direct to the microprocessor, so
>>>> there is only the jacks, PC traces, and the microprocessor
>>>> involved.
>>>>
>>>> 73,
>>>> Don W3FPR
>>>>
>>>>
>>>> Jean-François Ménard wrote:
>>>>> It seems that something let my K2 stuck in TX mode. I removed
>>>>> all module and put appropriate jumpers (unmod kit). Still in TX
>>>>> when powered ON. I checked this using my DL2 dummy load with my
>>>>> multimeter.... I always have output power !!
>>>>>
>>>>> Could it be a defective KEY jack that is jammed? I have nothing
>>>>> plugged......
>>>>>
>>>>>
>>>>> Le 08-09-18 à 23:33, Don Wilhelm a écrit :
>>>>>
>>>>>> Jean,
>>>>>>
>>>>>> This is strange - the second case of similar behavior reported
>>>>>> on the reflector today. Could it be a case of the 'phase of
>>>>>> the moon'?
>>>>>>
>>>>>> When the K2 is in transmit state, the behavior will be as you
>>>>>> describe - no buttons operate but the K2 displays the frequency.
>>>>>>
>>>>>> Check to see if your K2 is somehow stuck in transmit. The
>>>>>> easiest way is to check the state of the 8R and 8T voltages.
>>>>>> You can checkby measuring the DC voltage at the anodes of D6
>>>>>> and D7. During receive, the voltage at D6 anode should be
>>>>>> about 8 volts and the voltage at D7 should be near zero volts.
>>>>>> If the K2 is 'stuck in transmit', those voltages will be
>>>>>> reversed.
>>>>>>
>>>>>> If your K2 is indeed 'stuck in transmit', try removing the key
>>>>>> plug and the microphone - if something external is creating
>>>>>> that transmit condition, it should be OK with those cables
>>>>>> unplugged.
>>>>>>
>>>>>> 73,
>>>>>> Don W3FPR
>>>>>>
>>>>>> Jean-François Ménard wrote:
>>>>>>>
>>>>>>>
>>>>>>> Hi everybody,
>>>>>>>
>>>>>>> I have my first major trouble since my building experience
>>>>>>> back in 2004. Now, everytime i power up my K2, I can see
>>>>>>> ELECRAFT and then the frequency..... but everything is frozen
>>>>>>> after...... still get the frequency displayed, but no button,
>>>>>>> no function work. I also tried to reset the K2 to the factory
>>>>>>> default by holding 4-5-6 buttons..... Got the 201 message then
>>>>>>> back to the ELECRAFT and the frequency..... but still
>>>>>>> frozen !!!!
>>>>>>>
>>>>>>> Is it possible the the control board PIC got a static
>>>>>>> discharge or something like this !?!?!?!
>>>>>>>
>>>>>
>>>>> ============================
>>>>> De Jean-François Ménard / VA2SS
>>>>>
>>>>>
>>>>> ---
>>>>> ---
>>>>> ------------------------------------------------------------------
>>>>>
>>>>>
>>>>> No virus found in this incoming message.
>>>>> Checked by AVG - http://www.avg.com Version: 8.0.169 / Virus
>>>>> Database: 270.7.0/1680 - Release Date: 9/19/2008 8:25 AM
>>>>>
>>>>>
>>>
>>> ============================
>>> De Jean-François Ménard / VA2SS
>>>
>>>
>>>
>>> _______________________________________________
>>> Elecraft mailing list
>>> Post to: [hidden email]
>>> You must be a subscriber to post to the list.
>>> Subscriber Info (Addr. Change, sub, unsub etc.):
>>> http://mailman.qth.net/mailman/listinfo/elecraft
>>>
>>> Help: http://mailman.qth.net/subscribers.htm
>>> Elecraft web page: http://www.elecraft.com
>>
>> ============================
>> De Jean-François Ménard / VA2SS
>>
>>
>>
>> _______________________________________________
>> Elecraft mailing list
>> Post to: [hidden email]
>> You must be a subscriber to post to the list.
>> Subscriber Info (Addr. Change, sub, unsub etc.):
>> http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm
>> Elecraft web page: http://www.elecraft.com
>> ---
>> ---------------------------------------------------------------------
>>
>>
>> No virus found in this incoming message.
>> Checked by AVG - http://www.avg.com Version: 8.0.169 / Virus
>> Database: 270.7.0/1680 - Release Date: 9/19/2008 8:25 AM
>>
>>

De Jean-François Ménard VA2SS

Don Wilhelm-4

Re: K2 freeze at startup... need advice

Jean-Francois,

Saying what happened to U6 is only a guess, but I would suggest static
damage. Not necessarily static damage that happened recently, but
sometime in the past. However, if you had a nearby lightning strike
that caused a charge to build on your microphone cable or paddle cable,
that may be the reason.

One of the aspects of static damage is that it often does not fail
immediately, but at some time in the future. I suspect that is what
happened.
That is why we hear so much emphasis placed on using an anti-static mat
and a wrist strap when working with active devices.
Electronic devices are becoming more and more static sensitive, which is
a result not only of the technology used, but also from stuffing more
and more circuits into a smaller and smaller size. Before active
devices are mounted into a circuit, they are quite susceptible and must
be handled with care.

73,
Don W3FPR

Jean-François Ménard wrote:

> You are right!! After U6 removed.... RP4 pin 5 and 6 are now at 81k ohm!!
>
> U6 must be replaced
>
> Thanks for your help..... But one question remains..... What did
> happen to U6 ??
>
> Jean-François Ménard
>
> Le 08-09-19 à 09:52, Don Wilhelm <[hidden email]> a écrit :
>
>> Jean-Francois,
>>
>> Sounds like you are homing in on the problem. Try removing the
>> microprocessor and measuring the resistance between RP4 pins 5 and
>> 6. If it is normal (81K), then you have a bad microprocessor input
>> at pin 30. If so, replacement of U6 is the only solution I know about.
>>
>> 73,
>> Don W3FPR
>>
>> Jean-François Ménard wrote:
>>> I also found another thing.....
>>>
>>> Resistance check of Pin 7 and 8 of RP4 on the control board give me
>>> 81K ohm, but PIN 5 and 6 give me 19K ohm... should be 81K ohm too !!!
>>>
>>> Le 08-09-19 à 09:29, Jean-François Ménard a écrit :
>>>
>>>> It seems that a resistence check on the control board give me a
>>>> hint..... U6 PIN 29 are inside spec, but PIN 30 give me only 16K
>>>> ohm and should be higher... around 80K ohm to 90k
>>>>
>>>> The key jack seems to be good, R1 and R2 are OK.
>>>>
>>>> Re-insert controler on RF board, nothing change
>>>>
>>>>
>>>> Le 08-09-19 à 08:11, Don Wilhelm a écrit :
>>>>
>>>>> Jean-Francois,
>>>>>
>>>>> It certainly could be a faulty key jack, but it could be a
>>>>> microprocessor problem too.
>>>>> Turn the power down to zero for further testing.
>>>>> Then check the voltage at the end of R1 and R2 near the key jack
>>>>> - they are easy to reach if you remove the left side panel. The
>>>>> voltage should be near 5 volts if there is nothing pulling those
>>>>> inputs down.
>>>>> Remember that the DOT line and the PTT line are one and the same
>>>>> on the K2, so if that line is low the problem nay be in the key
>>>>> jack or on the Front Panel board.
>>>>>
>>>>> Should you find either the DOT or DASH lines near zero volts, turn
>>>>> power off and make resistance checks to find out if there is a
>>>>> short (maybe a solder bridge that has been dormant for a long
>>>>> time). Those signal lines run direct to the microprocessor, so
>>>>> there is only the jacks, PC traces, and the microprocessor involved.
>>>>>
>>>>> 73,
>>>>> Don W3FPR
>>>>>
>>>>>
>>>>> Jean-François Ménard wrote:
>>>>>> It seems that something let my K2 stuck in TX mode. I removed all
>>>>>> module and put appropriate jumpers (unmod kit). Still in TX when
>>>>>> powered ON. I checked this using my DL2 dummy load with my
>>>>>> multimeter.... I always have output power !!
>>>>>>
>>>>>> Could it be a defective KEY jack that is jammed? I have nothing
>>>>>> plugged......
>>>>>>
>>>>>>
>>>>>> Le 08-09-18 à 23:33, Don Wilhelm a écrit :
>>>>>>
>>>>>>> Jean,
>>>>>>>
>>>>>>> This is strange - the second case of similar behavior reported
>>>>>>> on the reflector today. Could it be a case of the 'phase of the
>>>>>>> moon'?
>>>>>>>
>>>>>>> When the K2 is in transmit state, the behavior will be as you
>>>>>>> describe - no buttons operate but the K2 displays the frequency.
>>>>>>>
>>>>>>> Check to see if your K2 is somehow stuck in transmit. The
>>>>>>> easiest way is to check the state of the 8R and 8T voltages.
>>>>>>> You can checkby measuring the DC voltage at the anodes of D6 and
>>>>>>> D7. During receive, the voltage at D6 anode should be about 8
>>>>>>> volts and the voltage at D7 should be near zero volts. If the
>>>>>>> K2 is 'stuck in transmit', those voltages will be reversed.
>>>>>>>
>>>>>>> If your K2 is indeed 'stuck in transmit', try removing the key
>>>>>>> plug and the microphone - if something external is creating that
>>>>>>> transmit condition, it should be OK with those cables unplugged.
>>>>>>>
>>>>>>> 73,
>>>>>>> Don W3FPR
>>>>>>>
>>>>>>> Jean-François Ménard wrote:
>>>>>>>>
>>>>>>>>
>>>>>>>> Hi everybody,
>>>>>>>>
>>>>>>>> I have my first major trouble since my building experience back
>>>>>>>> in 2004. Now, everytime i power up my K2, I can see ELECRAFT
>>>>>>>> and then the frequency..... but everything is frozen
>>>>>>>> after...... still get the frequency displayed, but no button,
>>>>>>>> no function work. I also tried to reset the K2 to the factory
>>>>>>>> default by holding 4-5-6 buttons..... Got the 201 message then
>>>>>>>> back to the ELECRAFT and the frequency..... but still frozen !!!!
>>>>>>>>
>>>>>>>> Is it possible the the control board PIC got a static discharge
>>>>>>>> or something like this !?!?!?!
>>>>>>>>
>>>>>>
>>>>>> ============================
>>>>>> De Jean-François Ménard / VA2SS
>>>>>>
>>>>>>
>>>>>> ------------------------------------------------------------------------
>>>>>>
>>>>>>
>>>>>>
>>>>>> No virus found in this incoming message.
>>>>>> Checked by AVG - http://www.avg.com Version: 8.0.169 / Virus
>>>>>> Database: 270.7.0/1680 - Release Date: 9/19/2008 8:25 AM
>>>>>>
>>>>>>
>>>>
>>>> ============================
>>>> De Jean-François Ménard / VA2SS
>>>>
>>>>
>>>>
>>>> _______________________________________________
>>>> Elecraft mailing list
>>>> Post to: [hidden email]
>>>> You must be a subscriber to post to the list.
>>>> Subscriber Info (Addr. Change, sub, unsub etc.):
>>>> http://mailman.qth.net/mailman/listinfo/elecraft
>>>>
>>>> Help: http://mailman.qth.net/subscribers.htm
>>>> Elecraft web page: http://www.elecraft.com
>>>
>>> ============================
>>> De Jean-François Ménard / VA2SS
>>>
>>>
>>>
>>> _______________________________________________
>>> Elecraft mailing list
>>> Post to: [hidden email]
>>> You must be a subscriber to post to the list.
>>> Subscriber Info (Addr. Change, sub, unsub etc.):
>>> http://mailman.qth.net/mailman/listinfo/elecraft Help:
>>> http://mailman.qth.net/subscribers.htm
>>> Elecraft web page: http://www.elecraft.com
>>> ------------------------------------------------------------------------
>>>
>>>
>>>
>>> No virus found in this incoming message.
>>> Checked by AVG - http://www.avg.com Version: 8.0.169 / Virus
>>> Database: 270.7.0/1680 - Release Date: 9/19/2008 8:25 AM
>>>
>>>
> ------------------------------------------------------------------------
>
>
> No virus found in this incoming message.
> Checked by AVG - http://www.avg.com
> Version: 8.0.169 / Virus Database: 270.7.0/1680 - Release Date: 9/19/2008 8:25 AM
>
>