Ken an Mike I did some Troubleshooting over the Years. 2 thing to help. I understand that there is an App for the I-Phone that Lets you see a Heat/IR Pattern on the screen. This should help SEE a Heated Part. The 2nd is, get a Can of Component Cooler/ Freeze Spray to Shoot the Hot Part and see The Problem recovers. I wou;ld Clean All Cables, Sockets and Plugs Power Supply Connections FIRST.
Ray WA6VAB K3 From: Michael Carter Sent: Monday, November 29, 2021 9:08 PM To: Elecraft@mailman.qth.net Subject: Re: [Elecraft] P3 Issue Ken, I have not experienced the difficulty with my P3 that you encountered, but the fact that both the P3 front panel display and the external SVGA display shut down indicates a problem with data not being provided to either display driver system OR there is a thermal problem with one of the onboard voltage regulators on the P3 Rear Panel I/O board. The P3 has both +5V and + 3.3V regulators with crowbar over-voltage protection, and both are fed from the +12V DC input jack. The P3 SVGA board has additional voltage regulators supplying 1.2, 2.5, and 3.3V, and these are fed from the +5 V regulated supply on the P3 Rear Panel I/O board. My suspicion is a thermal sensitivity in the +5 V regulator or its crowbar protection circuit. However, I would first check the +12V DC input connection to the P3 and be sure that it is stable at +12V over time. If you supply that voltage from the auxiliary +12V output of a K3 or K3s, you should also check that the problem doesn't stem from a problem inside the transceiver. My recollection is that a modification was required in the original K3 to increase the available current at the auxiliary +12V DC output to support the SVGA option in the P3. I am curious to know what you find....... 73, Mike, K8CN ______________________________________________________________ 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 wa6...@gmail.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
