[time-nuts] Brandywine GPS-4

[Jeroen Bastemeijer]

Hello Hal,

The serial connection is not the problem (unfortunately). It seems a 
thermal problem.... When I switch on the unit it takes a couple of 
minutes before the Error-LED starts flashing. Doing a "fast" power-cycle 
immediately gives an error-warning (the red-LED start flashing almost 
immediately after switch-on). When I let the unit cool down for some 
time (say ten minutes) it takes a couple of minutes before the error-LED 
comes on.

What I will try next is use some cool-spray on the DC-DC converters and 
see if that gives any change in the behaviour.

To my opninion everything inside gets quite warm... Maybe it is a bad 
capacitor (high ESR).

Is there any other good source for technical information on these units 
(schematics, service docs etc.)? Except for the manual wihich is on 
Didiers page?

73 Jeroen PE1RGE

Hal Murray wrote:
>> The unit used to work.... so dip-switch, cable etc. are OK. The thing
>> I  suspect is indeed, some problem with the FLASH and/or EPROM.
>> However, I  have no useful source of information about that. 
>>     
>
> Did it work with the serial port connected to a PC like you are using now?  
> Or did you just see the green LED go on?
>
> What happens if you try it without the serial connection?  (There are some 
> control signals on that connector that may not match normal RS-232 usage.)
>
>   
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