[time-nuts] T-Bolt lightning damage

paul swed paulswedb at gmail.com
Sat Jul 2 11:26:59 EDT 2016


John
Do you have a Scope?
If so you can confirm its the rs232 chip.
See if data is being generated into the chip on the ttl side (I know bad
term).
If so then perhaps the heat on the other chip is normal. If no data then
you most likely have an answer.
Good luck
Other comment watch for other failures to occur on other equipment over the
next 90 days. I have been hit numbers of times and yes grounding etc.
Something about being high clear and flat to have a home on. I think thats
called a target.
Regards
Paul
WB8TSL

On Sat, Jul 2, 2016 at 9:01 AM, John or Susan Lundberg <Lund5 at infionline.net
> wrote:

> Two weeks ago we had a lightning strike a tree in the backyard, and it
> coupled energy onto the coax to my 20M dipole. The coax was disconnected
> from the house, but the energy jumped to another coax running to my FMT
> setup in the garage. Carnage! The last (I hope) piece of equipment that I
> am attempting to repair is my T-Bolt.
>
> There is no visible sign of damage to the board and the external power
> supply is functioning, but Lady Heather reports no communications with the
> board.
>
> Voltages on the 232IBE ic suggest that it is damaged, in that there are
> only 4 volts on pin 2 (should be +10) and +0.8 volts on pin 6 (should be
> –10 volts). It appears that the 232’s on-board dc to dc converter is not
> working.
>
> While I was making the measurements, I felt something radiating a lot of
> heat. Poking around with my finger identified the large ic next to the 232
> chip as the source of the heat. This chip is labeled “Trimble” and has a
> FW=3.00 label on it and another label that reads 48051-30. This ic gets hot
> enough to burn my finger within about 5 minutes! Before I salvage the oven
> and consign the pwb to the scrap box, I thought I would ask if this is
> normal? If it is, I will go ahead and replace the 232 chip.
>
> John
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