[TenTec] Symptoms of logic board failure

[Dr. Gerald N. Johnson]

The time base messes up the processors, both control and DSP. Likely the 
buttons are side effects of the control processor running poorly. And 
that could be an effect of the FSK also. Flickering meter lamps points 
to a power supply problem that might be what ails the control board.

ALC might be a separate ailment from nearby lightning having fried the 
ALC detector diodes, its happened to many a Tentec.

Not everyone working RTTY knows what shift is or how to tell if its wide 
or not, especially with computer based RTTY. Hardware terminal units 
displayed shift as a normal function.

73, Jerry, K0CQ

On 1/21/2011 7:26 AM, Don Steele wrote:
> The original problem started during to 10 meter contest. All was working OK.
> I took a short break, and when I came back, the audio was dead on the rig. I
> cycled power, and at that point, the rig would not power up. No audio, no
> display, and every LED indicator came on. Also the meter lamps were very
> dim. I verified 13.66 volts out of the power supply, pulled the covers and
> could find no obvious issues with a quick look around.
>      However, before this all occurred, I was having issues with the rig,
> which may or may not be related to the logic board. Most of this rigs use is
> the second rig for SO2R RTTY contesting. I had many comments that my shift
> was too wide, way off frequency, etc. However these were intermittent. I may
> have made 30 or 40 qso's and only have 1 or 2 comments. Was it bad every
> time? I do not know. I also has flickering meter lamps, with new bulbs, the
> speech processor appeared to be inoperative, and the S meter was not reading
> correctly, mostly stuck at about s 5 with very little movement. I do not
> know,yet,if any of this was related to the logic board.
>      I received the rig back this week and hope to begin some testing here
> myself this weekend. I will keep the list informed if I can find any
> issues.I am not a fully trained service tech and do not have any test
> equipment other than a good multimeter, so I will be limited in how far I
> can go with this.
>
> Here is the list of problems from the service department at Ten Tec.
>
> Rid has several major problems.
> 1.Time base (Logic Board) hard to start and will drop out.
> 2. Key pad will lock-up
> 3. Display missing "D" segment
> 4. Audio will drop out.
> 5. TX?Audio board needs 1 or 2 crystals,RX and PLL not tested,RF amp working
> but no ALC.
>
> Please keep in mind, I am not faulting Ten Tec or their service department
> in any way. Paul gave me the choice of continuing the trouble shooting and
> repair as far as I was willing to pay for. However, he said we could easily
> spend 400 to 500 dollars and possibly end up with a logic board problem that
> they could not fix. Stopping where they did was my choice financially. As
> has been mentioned these are around a 1000.00 dollar rig used. Would you
> spend up to 500.00 out of your pocket, with no guarantee that the rig would
> be fixed?? Think about it.
>
> Don
> NT0F
>
> ----- Original Message ----- From: "Zivney, Terry L."<00tlzivney at bsu.edu>
> To:<tentec at contesting.com>
> Sent: Wednesday, January 19, 2011 4:56 PM
> Subject: [TenTec] Symptoms of logic board failure
>
>
>> I have seen lots of postings about "logic board failures" but haven't seen
>> any listing of the symptoms (specific problems) that caused the owners to
>> send their rigs in for repair.  Is there any common problem?
>>
>> NT0F, what was the original problem?
>>
>> Terry Zivney, N4TZ
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>
>
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