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

Bob Camp kb8tq at n1k.org
Sun Nov 30 11:31:36 EST 2014


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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