PSL Shutdown

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  • Updated 2 years ago
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My 6500 has developed a problem. It has worked flawless since I got it about 6 months ago.
Yesterday, after re-configuring the cabling to accommodate a new PA, it suddenly shutdown and displayed a PSL13V8-xx.xx error. The xx.xx is to indicate that the value varies after each shutdown (I  tried to bring it up several times). The shutdown occurs quickly after each attempt to transmit. I have done a reset of the radio, and also rebooted the power supply (an Astron 25A switching PS). Nothing seems to clear the problem. I have removed all connections except for the key and the dummy load.
Any suggestions?
Thanks,
Bob, W5LT
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Bob W5LT

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Posted 2 years ago

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Tim - W4TME, Customer Experience Manager

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I need the numbers from xx.xx
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Bob W5LT

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xx.xx   =  07.65; 09.34; 09.44 ; "check fuse" appeared after the last one.
First two are from a series experienced yesterday, the last one was a few minutes ago.
I can run more if you like.
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Bob W5LT

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PS: I forgot to mention at the start: I run with the Monster exclusively, and do not operate with SmartSDR. S/W load is 1.10.16.
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Bob W5LT

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PS-b: Another detail: after a restart, I have turned down the power from 100W to 5 or 10W before trying to transmit, but I get the same Shutdown error when I try.
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Tim - W4TME, Customer Experience Manager

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The radio is shutting down because it does not have a minimum voltage level to sustain proper operation of the radio.  Since this is happening on transmit, I suspect that there is a significant voltage drop under load.  Check the connection between your power supply and the radio, making sure that the PowerPole connector is properly seated at the radio and all other power lead connections are tight.  If they all look good, then it is possible that your power supply is not regulating its voltage under load.  If you have a different power supply to try, that is one troubleshooting step you can try.
(Edited)
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Bob W5LT

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Official Response
Solved: I disconnected, then re-seated all PowerPole connections from PS to Radio. It again transmits full power. Seems either one of them came loose, or one of the contacts did not make full contact for some reason. I did not think check them because everything had been working fine for months.
Thanks Tim, I will know now to check for such things first!
73s
Bob
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Tim - W4TME, Customer Experience Manager

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The power level numbers helped be determine what was happening.  Normally the radio shuts down @ ~9.4v but you had a 7.65VDC reading, which tells be the voltage drop was very rapid (faster than the sampling rate on the 13.8 VDC voltage rail.)  This can only happen if there is a very high resistance power connection between the radio and the power supply and the power pole connector is the first place to look (high probability event) or the power supply's regulator circuit is totally hosed (lower probability event).

Glad you got it going again.