K2 Problem Test Part 1
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Hello,
I'm Andy DL 1 XAS building up the K2 with the Nr 6345. I built up the control unit, the front panel unit, and the parts from RF board. The resistor tests before were succesful. Then the first test on page 43 should be done. The test started very good: the Elecraft and the 7.1000.00 c appears correct. And the annunciator for the VFO A were turned on. But also the annunciator for the PRE turned on. But the next test tapping the DISPLAY switch didn't work(no switching) Also VFO knob and Band switch or Rate switch didn't work. So I checked all the units for correct soldering and parts, I didn't find a mistake. Then I checked the voltage from U2 on Front panel board, and I saw that at PIN 5 there were no 5 Volts, which should be there. But when I pressed the BAND down switch the voltage went to 4 Volts. I bought a new 74HC165N and changed it, but nothing changed. Mistake must be at another point. I also checked the U2 on control unit, and there I found out, that instead of 6.9 V there only were between 2 and 4 Volt, depending changing the R1 trimmer.(The reason for the band switches don't work?) But the voltage from U4 (8V) and U5 (5V) were okay. so, I would be very glad, if anyone can help me for finding the problem, so that i can go on building my K2 :-) 73 from the region of Hamburg Andy, DL 1 XAS -- Ich verwende die kostenlose Version von SPAMfighter fur private Anwender, die bei mir bis jetzt 13846 Spammails entfernt hat. Bezahlende Anwender haben diesen Hinweis nicht in ihren E-Mails. Laden Sie SPAMfighter kostenlos herunter: http://www.spamfighter.com/lde ____________ Virus checked by G DATA AntiVirusKit Version: AVK 18.2889 from 25.02.2008 Virus news: www.antiviruslab.com _______________________________________________ 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 |
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Andy,
Some of the pushbuttons apparently are not working. The ones you mentioned are associated with the /BANK1 signal line on the Front Panel Board. Check front panel U3 very closely for a missed solder connection. U3 also controls the Encoder. Be certain U3 has been oriented correctly (compare with the parts placement diagrams at the back of the manual). The Front Panel pushbutton matrix is decoded by Front Panel U2 and U3, so pushbutton problems will likely be associated with the wiring of these two ICs. Front panel U2 should have the 5 volt supply on pin 16 (Vcc). While almost 5 volts will be found at the other inputs, those voltages will change when the pushbuttons are depressed - your experience with U2 pin 5 can be expected. The voltage will be reduced when a pushbutton is held depressed *and* the pushbutton state is queried with the /BANK1 (or /BANK2) line from U3. Check the soldering of the connectors on the Front Panel board, the Control Board and the RF Board. Often an unsoldered connection at these connectors is overlooked. The "problem" that you mentioned with Control Board U2 is not a problem at all - I am not certain where you found that U2 pin 5 should be at 5 volts - it will not go up that high. You will set U2 pin 5 to 3.8 volts later (using R1) when you adjust the AGC Threshold. 73, Don W3FPR andy wrote: > Hello, > > I'm Andy DL 1 XAS building up the K2 with the Nr 6345. > > I built up the control unit, the front panel unit, and the parts from RF > board. The resistor tests before were succesful. > > Then the first test on page 43 should be done. > > > The test started very good: the Elecraft and the 7.1000.00 c appears > correct. > > And the annunciator for the VFO A were turned on. But also the annunciator > for the PRE turned on. But the next test tapping the DISPLAY switch didn't > work(no switching) Also VFO knob and Band switch or Rate switch didn't work. > > So I checked all the units for correct soldering and parts, I didn't find a > mistake. > > Then I checked the voltage from U2 on Front panel board, and I saw that at > PIN 5 there were no 5 Volts, which should be there. But when I pressed the > BAND down switch the voltage went to 4 Volts. I bought a new 74HC165N and > changed it, but nothing changed. Mistake must be at another point. > > I also checked the U2 on control unit, and there I found out, that instead > of 6.9 V there only were between 2 and 4 Volt, depending changing the R1 > trimmer.(The reason for the band switches don't work?) > > But the voltage from U4 (8V) and U5 (5V) were okay. > > so, I would be very glad, if anyone can help me for finding the problem, so > that i can go on building my K2 :-) > > 73 from the region of Hamburg > > Andy, DL 1 XAS > > > 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 |
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Don,
Thanks a lot for your help. I checked U3 and all other parts on all the units for the right placement, I checked and renewed the soldering, which i did before. Nothing changed, so I was a little bit afraid against(checking some nights) Do you have an idea where I could measure with a digital multimeter perhaps in the near of U§ or U2 on front panel? Otherwise I only have the idea to compare the units with another K2 here in Hamburg. 73, Andy dl1xas -----Ursprüngliche Nachricht----- Von: Don Wilhelm [mailto:[hidden email]] Gesendet: Dienstag, 26. Februar 2008 01:45 An: andy Cc: [hidden email] Betreff: Re: [Elecraft] K2 Problem Test Part 1 Andy, Some of the pushbuttons apparently are not working. The ones you mentioned are associated with the /BANK1 signal line on the Front Panel Board. Check front panel U3 very closely for a missed solder connection. U3 also controls the Encoder. Be certain U3 has been oriented correctly (compare with the parts placement diagrams at the back of the manual). The Front Panel pushbutton matrix is decoded by Front Panel U2 and U3, so pushbutton problems will likely be associated with the wiring of these two ICs. Front panel U2 should have the 5 volt supply on pin 16 (Vcc). While almost 5 volts will be found at the other inputs, those voltages will change when the pushbuttons are depressed - your experience with U2 pin 5 can be expected. The voltage will be reduced when a pushbutton is held depressed *and* the pushbutton state is queried with the /BANK1 (or /BANK2) line from U3. Check the soldering of the connectors on the Front Panel board, the Control Board and the RF Board. Often an unsoldered connection at these connectors is overlooked. The "problem" that you mentioned with Control Board U2 is not a problem at all - I am not certain where you found that U2 pin 5 should be at 5 volts - it will not go up that high. You will set U2 pin 5 to 3.8 volts later (using R1) when you adjust the AGC Threshold. 73, Don W3FPR andy wrote: > Hello, > > I'm Andy DL 1 XAS building up the K2 with the Nr 6345. > > I built up the control unit, the front panel unit, and the parts from > RF board. The resistor tests before were succesful. > > Then the first test on page 43 should be done. > > > The test started very good: the Elecraft and the 7.1000.00 c appears > correct. > > And the annunciator for the VFO A were turned on. But also the > annunciator for the PRE turned on. But the next test tapping the > DISPLAY switch didn't work(no switching) Also VFO knob and Band switch > or Rate switch didn't work. > > So I checked all the units for correct soldering and parts, I didn't > find a mistake. > > Then I checked the voltage from U2 on Front panel board, and I saw > that at PIN 5 there were no 5 Volts, which should be there. But when I > pressed the BAND down switch the voltage went to 4 Volts. I bought a > new 74HC165N and changed it, but nothing changed. Mistake must be at > another point. > > I also checked the U2 on control unit, and there I found out, that > instead of 6.9 V there only were between 2 and 4 Volt, depending > changing the R1 trimmer.(The reason for the band switches don't work?) > > But the voltage from U4 (8V) and U5 (5V) were okay. > > so, I would be very glad, if anyone can help me for finding the > problem, so that i can go on building my K2 :-) > > 73 from the region of Hamburg > > Andy, DL 1 XAS > > > -- Ich verwende die kostenlose Version von SPAMfighter für private Anwender, die bei mir bis jetzt 13970 Spammails entfernt hat. Bezahlende Anwender haben diesen Hinweis nicht in ihren E-Mails. Laden Sie SPAMfighter kostenlos herunter: http://www.spamfighter.com/lde -- Ich verwende die kostenlose Version von SPAMfighter für private Anwender, die bei mir bis jetzt 13970 Spammails entfernt hat. Bezahlende Anwender haben diesen Hinweis nicht in ihren E-Mails. Laden Sie SPAMfighter kostenlos herunter: http://www.spamfighter.com/lde -- Ich verwende die kostenlose Version von SPAMfighter für private Anwender, die bei mir bis jetzt 13970 Spammails entfernt hat. Bezahlende Anwender haben diesen Hinweis nicht in ihren E-Mails. Laden Sie SPAMfighter kostenlos herunter: http://www.spamfighter.com/lde -- Ich verwende die kostenlose Version von SPAMfighter für private Anwender, die bei mir bis jetzt 13975 Spammails entfernt hat. Bezahlende Anwender haben diesen Hinweis nicht in ihren E-Mails. Laden Sie SPAMfighter kostenlos herunter: http://www.spamfighter.com/lde -- Ich verwende die kostenlose Version von SPAMfighter für private Anwender, die bei mir bis jetzt 13975 Spammails entfernt hat. Bezahlende Anwender haben diesen Hinweis nicht in ihren E-Mails. Laden Sie SPAMfighter kostenlos herunter: http://www.spamfighter.com/lde ____________ Virus checked by G DATA AntiVirusKit Version: AVK 18.2902 from 26.02.2008 Virus news: www.antiviruslab.com _______________________________________________ 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 |
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