Hi

First thing to check is the solder joints on the 9 pin connector. They have been a
bit of a problem on other TBolts. After that, check the voltage on the data out (TX)
pin. It should be negative by at least 3V and more likely 5V. If it’s not, check your
negative supply into the unit and the RS-232 driver. If the TX looks ok, go straight
to the RX side of the RS-232 driver. If the RX signal shows up there (plug and un-plug
your data cable) see if it goes over to the output pin of the device.

Lots of fun ...

Bob

Hi Dave,

There was one other report of something similar over the past ten years. I did not look into it.

Since your TBolt was part of the group buy, I'll send you a new one. Contact me off-list. But can you double check the -12 V power supply voltage for me? Anything between -7 and -15 is probably ok. But if it fails it will affect the serial port. Also, if you have time, open the box and use a 'scope on both the input (TTL) and output (RS232) of the serial transceiver.

Thanks,
/tvb

----- Original Message -----
From: "Dave Mallery" dave.mallery@gmail.com
To: "Discussion of precise time and frequency measurement" time-nuts@febo.com
Sent: Monday, June 19, 2017 1:16 PM
Subject: [time-nuts] TBolt help...

On 06/19/2017 04:16 PM, Dave Mallery wrote:

If you do a power-down reset, does it start talking again?  I
had one that did that.

Mike - AA8K

I had a T-Bolt 'failure' when my -12V supply died.

I am aware of another event on the list when the solder connection at the -12V connector to the t-Bolt failed.

Make sure the -12V is reaching the PCB for the T-Bolt.

Hope this helps.

Joe

-----Original Message-----
From: time-nuts [mailto:time-nuts-bounces@febo.com] On Behalf Of Tom Van Baak
Sent: Monday, June 19, 2017 3:42 PM
To: Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] TBolt help...

Hi Dave,

There was one other report of something similar over the past ten years. I did not look into it.

Since your TBolt was part of the group buy, I'll send you a new one. Contact me off-list. But can you double check the -12 V power supply voltage for me? Anything between -7 and -15 is probably ok. But if it fails it will affect the serial port. Also, if you have time, open the box and use a 'scope on both the input (TTL) and output (RS232) of the serial transceiver.

Thanks,
/tvb

----- Original Message -----
From: "Dave Mallery" dave.mallery@gmail.com
To: "Discussion of precise time and frequency measurement" time-nuts@febo.com
Sent: Monday, June 19, 2017 1:16 PM
Subject: [time-nuts] TBolt help...

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hi

i have powered down a few times and no no joy

thanks

dave

On Mon, Jun 19, 2017 at 1:58 PM, Mike Naruta AA8K aa8k@comcast.net wrote:

--
Dave Mallery, K5EN                (ubuntu linux 16-10)
PO Box 15                              Ophir,  OR  97464

  linux counter #64628 (since 1997)

hi

many thanks to all!

it was much simpler:  the pins in the power plug on the Tbolt had gradually
slid up in the connector block till the -12 disconnected.
all this in a closed insulated box on the wall!!!

humbled and happy

73,

dave mallery, k5en

On Mon, Jun 19, 2017 at 7:12 PM, J. L. Trantham jltran@att.net wrote:

--
Dave Mallery, K5EN                (ubuntu linux 16-10)
PO Box 15                              Ophir,  OR  97464

  linux counter #64628 (since 1997)