[TenTec] 9420 P/S Problem....Need Help

[Bob Good]

Yes, I have copper braid between all units connected to a common point 
ground and all connections appear to be very tight.  Thank you,  Bob

-----Original Message----- 
From: w3ka at lycos.com
Sent: Monday, April 20, 2015 16:14
To: Discussion of Ten-Tec Equipment
Subject: Re: [TenTec] 9420 P/S Problem....Need Help


   Double check that you have a good solid "ground braid" connection
between the Omni 6, the Hercules,
   and the power supply.



   On 2015-04-20 19:57, Bob Good wrote:




> Greetings "Tentechnical" Friends........ I have a problem with my old 
> "reliable" OmniVI > Hercules II (with 9420) > 238 station. I have 
> concluded the problem is with the 9420. Omni straight through is fine. 
> Disconnect the 9420 and run the Herc off a battery, works fine. Here is 
> the symptom: While bringing the power up to about 200 watts output into a 
> dummy load with a 1.2:1 swr, a relay starts to chatter in the power 
> supply. The pilot lamp in the Herc (now a led) almost extinguishes with 
> each pulse of the relay. Monitoring the Voltage, the Herc Meter indicates 
> it just wiggles at about 14 volts indicated. The RF output appears to drop 
> out with each relay pulse and the current meter wildly fluctuates. I have 
> all the manuals by Ten Tec and have looked at the diagrams. I have opened 
> the top of the unit and nothing is burned. Harness plugs appear to be 
> seated. I am assuming the problems lies with the circuitry on the P/S 
> controller board involving either K-3 or K-4. I have not tried to go 
> further by hooking the 9420 back up to the Herc or disassembling the unit. 
> I have not yet checked voltages inside. Of course, it is running on "220" 
> vac. I am hoping some of you perhaps have had the same problem and can 
> help me step through the repair. If you have free long distance, I am 
> available at 912-863-5767. All my info on QRZ is current. Thanks for 
> reading and please spread the word. Regards, Bob K4BG
> _______________________________________________
> TenTec mailing list
> TenTec at contesting.com
> http://lists.contesting.com/mailman/listinfo/tentec [1]


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