A radical procedure (short of replacing the Trimble Asic) is to take a brush
and brush the pins on the pcb. Hard, but not hard enough to damage the board or
the pins. Then clean the pcb with alcohol and compressed air.
Trimble uses RoHs solder, which will eventually generate tin whiskers that
.
Hope this helps.
Joe
-Original Message-
From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On
Behalf Of Ed Palmer
Sent: Friday, May 11, 2012 12:39 PM
To: Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] Tbolt failure modes
Are there multiple
of precise time and frequency measurement
Subject: Re: [time-nuts] Tbolt failure modes
Joe,
Interesting tests.
So, in your previous problem, loss of -12V caused loss of communication
while in your recent tests, you didn't lose communication, regardless of
whether the -12V failure was open or grounded
...@sasktel.net
To: Discussion of precise time and frequency measurement time-nuts@febo.com
Sent: Saturday, 12 May 2012, 8:01
Subject: Re: [time-nuts] Tbolt failure modes
Joe,
Interesting tests.
So, in your previous problem, loss of -12V caused loss of communication
while in your recent tests, you didn't
Ooops, thanks for the correction...
Then I assume that if the voltage is too low for the negative reference
headroom, severe stability problems could result.
Didier KO4BB
--Original Message--
From: Mark Sims
Sender: time-nuts-boun...@febo.com
To: Time-Nuts
ReplyTo: Time-Nuts
Subject:
Hi
I have never fully traced out the DAC on the TBolt. I have gone far enough to
see that it's a sum of several sort of circuit. My guess is that they sum and
then measure the result with a good ADC. If so, the DAC would likely function
fine as long as the ADC was not impacted by the loss of
On 05/12/2012 03:37 PM, Mark Sims wrote:
It sounds like the -12V supply is used to generate the DAC low voltage
reference. If it is floating, the DAC output will be unstable. If it is at a
solid voltage, the DAC output will be stable. The standard EFC range for a
tbolt is -5V to +5V,
Thanks everyone!
On 05/12/2012 03:37 PM, Mark Sims wrote:
It sounds like the -12V supply is used to generate the DAC low voltage
reference. If it is floating, the DAC output will be unstable. If it
is at a solid voltage, the DAC output will be stable. The standard EFC
range for a tbolt
Today I 'failed' the -12 V supply again and got screen captures of the
TBoltMon GUI with the TBolt operating normally, -12V failed short and -12V
failed open.
I used a 5372A referenced to a Z3816A to measure the 10 MHz output frequency
of the TBolt for normal operation followed by -12V failed
-boun...@febo.com
Date: Tue, 8 May 2012 21:29:06
To: 'Discussion of precise time and frequency measurement'time-nuts@febo.com
Reply-To: Discussion of precise time and frequency measurement
time-nuts@febo.com
Subject: Re: [time-nuts] Tbolt failure modes
I had a failure of my -12 V supply
-
From: J. L. Tranthamjlt...@att.net
Sender: time-nuts-boun...@febo.com
Date: Tue, 8 May 2012 21:29:06
To: 'Discussion of precise time and frequency measurement'time-nuts@febo.com
Reply-To: Discussion of precise time and frequency measurement
time-nuts@febo.com
Subject: Re: [time-nuts] Tbolt
-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On
Behalf Of Ed Palmer
Sent: Friday, May 11, 2012 12:39 PM
To: Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] Tbolt failure modes
Are there multiple hardware versions of the Tbolt (other than the
Tbolt-E)? My Tbolt
: Tuesday, May 08, 2012 5:33 PM
To: Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] Tbolt failure modes
Hi Magnus,
On 05/08/2012 11:58 PM, Bob Camp wrote:
Hi
The first thing to check is the soldering job on the DB-9 connector.
Second thing to check is the RS-232
Hi
The first thing to check is the soldering job on the DB-9 connector. Second
thing to check is the RS-232 level translator IC. (RS-232 in should create TTL
etc)
Bob
On May 8, 2012, at 5:52 PM, b...@lysator.liu.se wrote:
Hi group!
Just got a few Thunderbolts. It is a few PN 39448-61 and
Hi Bob,
The DB-9 looks fine even with magnifying glass.
The good one has a MAX232EWE IC, the faulty has a TC232EOE. I see
RS232-level coming in at pin 13 and going inside the Tbolt at pin 12 (ttl
level).So there should be no problem there.
Have also swapped PSU board, so the problem is inside
Agreed, the CPU is not working... check the 3.6864MHz crystal under the
CPU. If it is possible to locate the reset signal...
On Wed, May 9, 2012 at 12:23 AM, b...@lysator.liu.se wrote:
Hi Bob,
The DB-9 looks fine even with magnifying glass.
The good one has a MAX232EWE IC, the faulty has a
Hi Magnus,
On 05/08/2012 11:58 PM, Bob Camp wrote:
Hi
The first thing to check is the soldering job on the DB-9 connector.
Second thing to check is the RS-232 level translator IC. (RS-232 in
should create TTL etc)
Does not explain why the OCXO remains stuck as if it was untrained.
I
On 05/09/2012 12:23 AM, b...@lysator.liu.se wrote:
Hi Bob,
The DB-9 looks fine even with magnifying glass.
The good one has a MAX232EWE IC, the faulty has a TC232EOE. I see
RS232-level coming in at pin 13 and going inside the Tbolt at pin 12 (ttl
level).So there should be no problem there.
Agreed, the CPU is not working... check the 3.6864MHz crystal under the
CPU. If it is possible to locate the reset signal...
Time to get some sleep... I found the crystal. It is not easily probeable
when mounted on the PSU board. Also the power rail has to short pins to
accept the external 3
On 05/09/2012 12:33 AM, b...@lysator.liu.se wrote:
Hi Magnus,
On 05/08/2012 11:58 PM, Bob Camp wrote:
Hi
The first thing to check is the soldering job on the DB-9 connector.
Second thing to check is the RS-232 level translator IC. (RS-232 in
should create TTL etc)
Does not explain why the
Here in Europe the time now is late night, anyway there is also U15: a
LinearTechnolgy LT2105 or LTC2105 but I can't find nothing... maybe it a
marking code and not the actual part number. Maybe a linear regulator,
google says LT2105-5.0 but on the Linear site it doesn't exist.
On Wed, May 9,
No, it is an LT1021DCS8-5 5V precision voltage reference. Not a voltage
regulator, should be the refernce for the OCXO DAC.
On Wed, May 9, 2012 at 12:49 AM, Azelio Boriani azelio.bori...@screen.itwrote:
Here in Europe the time now is late night, anyway there is also U15: a
LinearTechnolgy
On 05/09/2012 12:49 AM, Azelio Boriani wrote:
Here in Europe the time now is late night, anyway there is also U15: a
LinearTechnolgy LT2105 or LTC2105 but I can't find nothing... maybe it a
marking code and not the actual part number. Maybe a linear regulator,
google says LT2105-5.0 but on the
I had a failure of my -12 V supply that interrupted communications that was
resolved by fixing the -12 V supply. You might want to make sure you are
getting the -12 V supply in the unit. I suspect your 24 V supply provides
power to an internal supply that generates +12, +5 and -12 V.
Might want
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