Thanks, Don. I'm ordering U1 and U5. The display is completely dead--no segments. I also see I erred in reporting that all other voltages were ok. U5 pins 1 & 2 measured 0.0. Don't know how I missed that but it makes sense as the receiver is dead.
Clark/WU4B On Mon, Feb 2, 2015 at 9:40 PM, Don Wilhelm-4 [via Elecraft] < ml-node+s365791n759784...@n2.nabble.com> wrote: > Clark, > > U1 pin 7 is the VSMTR signal and the voltage source comes from the > product detector U5 pin 2. > Either the product detector is damaged or U1 pin 7 has a shorted input. > To check which, remove U1 and bend pin 7 out a bit, then plug it back > into the socket with pin 7 hanging on the outside. > If U5 pin 2 (and pin 1) are then at 1.4 volts, U5 is likely OK. > > U1 pins 21 through 28 drive the display directly, so that is why the > display is garbage. Specifically pin 23 drives segment C and pin 25 > drives segment E - those are the two vertical bars on either side of the > lower portion of the display. > > Yes, I would replace U1, and if the test above shows U5 is damaged, > replace it as well. Generally the SA612 ICs are quite hardy, but yes > damage can occur just the same. > > 73, > Don W3FPR > > On 2/2/2015 6:04 PM, engineercm wrote: > > > While doing some rework, a hot lead fell out of my hand and dropped on > the > > board. A few segments on the display lit up briefly and then an eerie > > silence. Except for the little map light, nothing works. I've checked > the > > DC voltages on the IC's and voltage regulators and the only voltages I > can > > find out of limit are on U1: > > > > pin 7: 0 and should be 1.4 > > pin 23: .3 and should be 4.9 > > pin 25: .5 and should be 5.0 > > > > It would appear that the MCU is blown although I can't quite see how > these > > pins could keep the display from working. The hot lead dropped down in > the > > physical between the 3 blue buttons and the MCU. I've verified that the > > xtal oscillator that drives the MCU is running. > > > > Before I order a new MCU, are there any other components that I might > have > > blown due to carelessness that I can check? > > > > > > ______________________________________________________________ > Elecraft mailing list > Home: http://mailman.qth.net/mailman/listinfo/elecraft > Help: http://mailman.qth.net/mmfaq.htm > Post: mailto:[hidden email] > <http:///user/SendEmail.jtp?type=node&node=7597844&i=0> > > This list hosted by: http://www.qsl.net > Please help support this email list: http://www.qsl.net/donate.html > Message delivered to [hidden email] > <http:///user/SendEmail.jtp?type=node&node=7597844&i=1> > > > ------------------------------ > If you reply to this email, your message will be added to the discussion > below: > > http://elecraft.365791.n2.nabble.com/KX1-I-Killed-My-Rig-tp7597836p7597844.html > To unsubscribe from KX1: I Killed My Rig, click here > <http://elecraft.365791.n2.nabble.com/template/NamlServlet.jtp?macro=unsubscribe_by_code&node=7597836&code=Y2xhcmsubWFjYXVsYXlAZ21haWwuY29tfDc1OTc4MzZ8MTY3ODUwMTQyMQ==> > . > NAML > <http://elecraft.365791.n2.nabble.com/template/NamlServlet.jtp?macro=macro_viewer&id=instant_html%21nabble%3Aemail.naml&base=nabble.naml.namespaces.BasicNamespace-nabble.view.web.template.NabbleNamespace-nabble.view.web.template.NodeNamespace&breadcrumbs=notify_subscribers%21nabble%3Aemail.naml-instant_emails%21nabble%3Aemail.naml-send_instant_email%21nabble%3Aemail.naml> > -- 72, Clark WU4B QRPARCI #10815 SKCC #3892 Southeastern DX Club <http://www.sedxc.org> North Georgia QRP Club <http://www.nogaqrp.org> Kennehoochee Amateur Radio Club <http://www.w4bti.org> *"It is vain to do with more what can be done with less."* *Attributed to *William of Occam (1288 AD - 1348 AD) -- View this message in context: http://elecraft.365791.n2.nabble.com/Re-KX1-I-Killed-My-Rig-tp7597848.html Sent from the Elecraft mailing list archive at Nabble.com. ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to arch...@mail-archive.com
