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[Yaesu] MK-V GLitch

To: yaesu@contesting.com
Subject: [Yaesu] MK-V GLitch
From: dennis o'connor <k8do@mailblocks.com>
Reply-to: k8do@mailblocks.com
Date: Mon, 19 Jul 2004 09:15:14 -0700
List-post: <mailto:yaesu@contesting.com>
Just a note to notify the group of a minor glitch I had... The MK-V locked up while in receive... The dial would tune, and volume control worked, but no other controls worked... Could not change bands/modes/filters/xmit/etc... Acted like the front panel was disconnected...
Did a power off cycle, no change... Did a soft boot on the processor, no change... Did a medium hard boot on the processor, no change... Did the full hard boot on the processor (AKA four finger salute), no change... Lots of head scratching... Decided the CPU board had a bad chip and the radio was probably toast, so I went to the shed for the shipping box... While there I remembered there is a switch on the back panel for the lithium battery to the cmos memory... Decided to try that before boxing it up... Now the manual gives the impression that a hard boot wipes out everything stored in cmos memory no matter what, but it apparently didn't for me... Turned the battery off, hard booted, and suddenly it was all working again..

So, there I was, re-dialing in my memory selections, when it locked up - again...
"now just a doggone minute, here!"...
At that point I knew there was something going on external to the radio, because CPU chips don't heal themselves and then get sick again... After pulling the radio out and examining all the wiring back there it dawned on me that I had a USB to com port adapter plugged into the com port on the radio, but I had unplugged it from the computer recently, leaving the end lay on the bench... I unplugged the com port cable off the back of the radio and rebooted and again everything was OK...
I used the MK-since then, for the NAQP RTTY contest this past weekend, and it worked fine, so I suspect that stray current was being picked up on the unterminated USB/COM adapter, and glitching the CPU...

Denny - K8DO

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