[time-nuts] Lucent KS-24361 / Z3810A : problem with Z3812A/REF 0 unit power up?

Tom Miller tmiller11147 at verizon.net
Sun Jan 4 18:10:42 EST 2015

The interface jumper cable has several short pins that sometimes do not make 
a good connection. You might check that it is fully plugged in on both ends 
and that all 15 pins look ok. The cable crosses over the pins such that pin 
1 of one end goes to pin 15 of the other and so on.

There are some power supply test points on the top of the board that you can 
get to with the cover removed. There should be +5, +15, and -15 volts in 

Do you have an amplified antenna connected to the GPS Rx input? The antenna 
should use +5 volts.


----- Original Message ----- 
From: "Stan" <swperk at earthlink.net>
To: <time-nuts at febo.com>
Sent: Sunday, January 04, 2015 5:42 PM
Subject: [time-nuts] Lucent KS-24361 / Z3810A : problem with Z3812A/REF 0 
unit power up?

> Hello,
> I just received my Lucent KS-24361 and set it up on my bench to power it 
> up.
> I connected the Z3809A interconnect cable between the two units 
> (Z3811A/REF
> 1, and Z3812A/REF 0) and applied +24VDC to the appropriate pins on the two
> DE-9 connectors. The Z3811A/REF 1 ran through a sequential test of the 
> four
> LEDS and then after a few seconds it settled in with the amber "NO GPS" 
> and
> the red "FAULT" LEDs illuminated. Meanwhile, the Z3812A/REF 0 unit never 
> lit
> a single LED and is still sitting there with all LEDs dark. Both units are
> drawing current: the Z3811A/REF 1 draws about 700 mA steady state, and the
> Z3812A/REF 0 draws only slightly less: 600 mA steady state. So far, I've
> swapped power connectors between the units and saw no difference, and I
> tried to power up the Z3812A/REF0 alone, but still no joy.
> Am I missing something about the setup, or do I have a defective Z3812/REF 
> 0
> unit?
> Thanks,
> Stan
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