[time-nuts] Austron 2100 Loran-C Frequency and Timing Receiver

Brooke Clarke brooke at pacific.net
Fri Oct 17 18:14:34 UTC 2008

Hi Skip:

I used the HP signature analyzer and found a bad data bus buffer chip is short 
order.  I'm  sure it would also identify a bad EPROM chip.

Have Fun,

Brooke Clarke
http://www.prc68.com/P/Prod.html  Products I make and sell
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Skip Withrow wrote:
> Hello Time-Nuts, 
> Well, my Austron 2100 seems to have bit the dust.  The indication of trouble 
> is that the 1pps light quit blinking.  After some debug it appears that all 
> the hardware is working (I have the manual with schematics) and that it is 
> not getting a software pulse that diddles a flip-flop. 
> There are some software diagnostic routines in the box.  The RAM test runs 
> fine, but it appears that I get an error on the EPROM test.  The test 
> generates an E-20 error.  The book states that if the EPROM test fails it 
> will give an E-21, but nowhere do I find any hint as to what an E-20 error 
> is. 
> I suspect that perhaps I have a corrupted EPROM.  Most of the code appears 
> to be working properly (front panel display and buttons work, it will even 
> lock to Loran).  There are three 2732A EPROMS, but no indication as to the 
> checksum on the devices so can't verify if one is bad. 
> Is there a time-nut out there with an Austron 2100?  I would like to get a 
> copy of the EPROMS or the code in them to check my unit.  Even the checksums 
> would help (given that the firmware revision is the same).  The boards are 
> very easily accessed from the front panel and the unit doesn't even have to 
> be taken out of the rack.  I have the capability to read and program the 
> devices. 
> Thanks in advance for any help with this oldie, but (was) goodie. 
> Skip Withrow 
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