[time-nuts] Fwd: Re: Lucent KS-24361

Götz Romahn goetz at g-romahn.de
Sun Nov 30 12:41:20 EST 2014

thanks for your suggestion. No chips are socketed. I'll continue searching.

Am 30.11.2014 17:31, :
> Hi
> I suspect the key to your issues are the FPGA error codes. It’s likely that a lot of the “work” is done in the FPGA. If it is not setting up properly, you will get all sorts of problems.
> Try:
> 1) Unplug the memory chips and plug them back in. Sockets can have issues …
> 2) Look for tin whiskers around the FPGA pins. Sometimes a good scrub with a toothbrush is quicker than looking.
> 3) There has to be a clock signal into the FPGA. It may be the 5 /10 /15 MHz, it may be something else. Run around the “good” unit with a scope and then do the same on the bad one.
> If the box is still inside the 30 day warranty - send it back. Even if it isn’t, contact the seller.
> Bob
>> On Nov 30, 2014, at 10:50 AM, Götz Romahn <goetz at g-romahn.de> wrote:
>> hello Tom,
>> thank you for your kind response.
>> All voltage levels are fine and I have 5MHz as well as 15MHz on the
>> board. DC levels at transistors I testet were not suspicious.
>> I have no idea where how the 10MHz is generated. I do not see any
>> doubler active but see a tripler at 15MHz.
>> May be the community can explain my error listings especially the
>> "OSC_DEL, error code: 01H". OCXO has good output and heater seems to be
>> ok as well as EFC.
>> cheers Götz
>> Am 30.11.2014 05:59, :
>>> Hello Götz,
>>> I think I saw the 10 MHz on several points. At least one of the nearby
>>> transistors also showed some signal. I have another project on the bench
>>> right now but when it is done, I'll throw the ref-1 back on the bench
>>> and make some notes. Do you have the 15 MHz and is the 5 MHz oscillator
>>> running? How about the supply voltages? They are marked and have test
>>> points. Also, you could make some DC measurements on the two transistors
>>> as they are standard SMT devices.
>>> Sure wish someone would shake a schematic out of the woods.
>>> Best regards,
>>> Tom Miller,
>>> Forest Hill, Maryland
>>> WA3PZI
>>> ----- Original Message ----- From: "Götz Romahn" <goetz at g-romahn.de>
>>> To: <tmiller11147 at verizon.net>
>>> Sent: Friday, November 28, 2014 12:23 PM
>>> Subject: Re: [time-nuts] Lucent KS-24361
>>>> hi Tom,
>>>> from your postings at [time nuts] I've read, that you have found
>>>> several locations with 10 MHz signal on the backside of the
>>>> REF-1/REF-0 boards. My problem is, my REF-1 has run into fault mode
>>>> and  the 10 MHz at the collector of Q208 is missing now. It was there
>>>> before the failure occurred. Retracing the PCB connections for the
>>>> source of the 10 MHz is not so easy with no active signal. It would be
>>>> very helpful if you could provide some more positions where I should
>>>> see the 10 MHz as this could help help finding the reason of the failure.
>>>> :diag:log:read:all? gives
>>>> scpi > Log status: 10  entries
>>>> Log 001:20141120.00:02:37:  Log cleared
>>>> Log 002:20141120.00:00:00:  Power on
>>>> Log 003:20141120.00:00:00:  FAIL: OSC_DEL, error code: 01H
>>>> Log 004:20141120.00:00:01:  FAIL: FPGA, error code: 01H
>>>> Log 005:20141120.00:00:01:  FAIL: INT_REF, error code: 01H
>>>> Log 006:20141120.00:00:01:  Self-test failed
>>>> Log 007:20141120.00:00:01:  Failed mode entered
>>>> Log 008:20141120.00:00:01:  Antenna fault set
>>>> Log 009:20141120.00:00:02:  1PPS output failure set
>>>> Log 010:20141120.00:00:02:  Power settings ok, Int: 17 dBm, Ext: 17 dBm
>>>> thanks in advance for your efforts and have a good time at
>>>> thanksgiving Goetz (Berlin, Germany)
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