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

Götz Romahn goetz at g-romahn.de
Sun Nov 30 10:50:51 EST 2014

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
> ----- 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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