[Elecraft] K2 troubleshooting (was: K2 AGC)

2024-03-02 Thread Michael Carter via Elecraft
Hi Iran, I changed the subject line to reflect that this thread is continuing as a general troubleshooting exercise with your K2. The NE602 product detector has a balanced output circuit and unless you use a differential scope probe (or do the CH1 - CH2 trick with your single-ended probes) you

[Elecraft] K2 troubleshooting help and/or troubled k2 for sale

2010-03-21 Thread Gary Slagel
Hi guys,   I've got a k2/100 giving me fits!  After about 30 minutes of qso time, output shuts down completely on 20 and 30 meters.  After a period of time (15 minutes to a couple hours) it will come back on and then run happily for as long as I want.  For instance, november sweepstakes it shut

Re: [Elecraft] K2 troubleshooting help and/or troubled k2 for sale

2010-03-21 Thread Alan D. Wilcox
Gary, Sounds like you've got a thermal intermittent issue in the K2. I'd examine the toroids' soldering to be sure the enamel's been completely removed. Reflow all with a good hot iron - sometimes a solder connection can look okay, but still be bad (or worse, intermittent ). Alan Alan D.

[Elecraft] K2 Troubleshooting

2008-10-03 Thread Ron McCurdy
My reason for troubleshooting is there is NO SOUND. I can hear the sidetone when I turn it on. I cannot hear the 7000hz tone. 1. My reference oscillator output is 0.511.a little low. 2. VCO output is okay. 3. BFO output is okay. 4. Mixer, I.F. amplifier, Crystal filter = 0.00

Re: [Elecraft] K2 Troubleshooting

2008-10-03 Thread Don Wilhelm
Ron, Is this a newly built K2 that has not worked before, or has it once worked and has now failed? The DC voltage chart listings for the Control Board are for the condition that the Front Panel is removed. If you have the Front Panel plugged in, the U2 voltages will be quited different. I

[Elecraft] K2 Troubleshooting question

2008-03-26 Thread DW Holtman
Hello, Last night I was working on an older K2 S/N 02XX. I was going to install a SSB module and a RS232 adapter that I bought from a forum member. I installed the SSB with no problems. When I installed the RS232 adapter and turned it on, I got an error message (080) I think), I quickly

Re: [Elecraft] K2 troubleshooting

2006-06-08 Thread Tom Hammond
Hi John: Now, as I was reviewing solder joints, etc., I noted that one of the solder pads for C4 was touching the outer can tab of L1. My question: Is this a solder bridge, or is there supposed to be a connection between C4 pad and outer (ground) tab of L1? I looked on N0SS's PCB pix and I

[Elecraft] K2 troubleshooting

2006-06-07 Thread John Wiener
I SHOULD be embarrassed by my mistakes...but, I figure, I am learning more electronics in the last few months than I ever did in my early years. So, I really don't mind sharing them with the group. Hope the group doesn't mind. Here's the latest news: Yes, as noted before I found errors

Re: [Elecraft] K2 troubleshooting

2006-06-07 Thread David A. Belsley
John: Don't use the pictures for this, use the schematic. There you'll see that one end of C4 is grounded, as is the can of L1. best wishes, dave belsley, w1euy On Jun 7, 2006, at 9:05 PM, John Wiener wrote: I SHOULD be embarrassed by my mistakes...but, I figure, I am learning more

RE: [Elecraft] K2 troubleshooting

2006-06-07 Thread Don Wilhelm
email Subject: [Elecraft] K2 troubleshooting I SHOULD be embarrassed by my mistakes...but, I figure, I am learning more electronics in the last few months than I ever did in my early years. So, I really don't mind sharing them with the group. Hope the group doesn't mind. Here's the latest

[Elecraft] K2 troubleshooting

2006-05-29 Thread John Wiener
Hi everyone! I am diligently trying to solve transmitter probs on a nearly finished K2. I would like to list here the aberrant readings so that someone much brighter than I might see the source of the problem. If this is an inappropriate use of the group, please let me know and I will

RE: [Elecraft] K2 troubleshooting

2006-05-29 Thread Don Wilhelm
John, The PA Transistor Test values will vary depending on your particular DMM - some will show forward voltage while others will show ohms. Your .55 reading on the base to emitter with the probes either way would indicate something to be concerned about - but since you are testing in-circuit,

[Elecraft] K2 troubleshooting

2006-05-28 Thread John Wiener
Hi everyone, Hope Memorial Day is fun (and meaningful) for all. I am rechecking T4. Leads 1 2 are Green hookup wire in 2 turns on the binocular core, leads 3 4 are white in 3 turns. I think I have wound it correctly...it looks the same as the diagrams in Figures 6-28 and 6-29. Just to

RE: [Elecraft] K2 troubleshooting

2006-05-28 Thread Don Wilhelm
John, Yes, you have it correct. Each pass of the wire through both holes is one turn. Note for the near future - when you put in the 'links', these bare wires go only through one hole of the binocular core. 73, Don W3FPR -Original Message- Hope Memorial Day is fun (and meaningful) for

[Elecraft] K2 Troubleshooting

2004-07-29 Thread Scott Cashel
Good Day, I have completed the assembly of the control board, front panel, and initial rf board and assembled same. On power up the background illuminates and some clicking occurs but nothing else. I have disassembled and rechecked component locations and retouched the solder connections

Re: [Elecraft] K2 Troubleshooting

2004-07-29 Thread Bob Miller
to ensure you have contact with the circuit board. Bob WB6KWT - Original Message - From: Scott Cashel [EMAIL PROTECTED] To: elecraft@mailman.qth.net Sent: Thursday, July 29, 2004 9:55 AM Subject: [Elecraft] K2 Troubleshooting Good Day, I have completed the assembly of the control board

Re: [Elecraft] K2 Troubleshooting

2004-07-29 Thread Don Wilhelm
, etc.) to give further informative advice (at this point we can only guess based on the limited information available). 73, Don W3FPR - Original Message - From: Scott Cashel [EMAIL PROTECTED] To: elecraft@mailman.qth.net Sent: Thursday, July 29, 2004 12:55 PM Subject: [Elecraft] K2

Re: [Elecraft] K2 Troubleshooting

2004-07-29 Thread G3VVT
Scott, Check that you have soldered pin 1 of the LCD driver U1 on the K2 front panel board. I and others have missed this joint. Rather difficult to rectify afterwards, though can be done. Bob, G3VVT K2 #4168 ___ Elecraft mailing list Post to:

Re: [Elecraft] K2 Troubleshooting

2004-07-29 Thread Peter Howson
% complete - Original Message - From: Bob Miller [EMAIL PROTECTED] To: elecraft@mailman.qth.net Sent: Thursday, July 29, 2004 6:43 PM Subject: Re: [Elecraft] K2 Troubleshooting Scott, If you aren't seeing anything on LCD display, go back and check the soldering on the display