[time-nuts] HPZ3801 Failure

Joseph Gray jgray at zianet.com
Thu Feb 4 22:09:20 EST 2016


Wes,

I just checked and KO4BB already has the power supply info.

http://www.ko4bb.com/manuals/index.php?dir=02_GPS_Timing/Z3801

Joe Gray
W5JG



On Thu, Feb 4, 2016 at 5:21 PM, paul swed <paulswedb at gmail.com> wrote:
> Daves absolutely correct about working around bad supplies.
> The reason for the preregulator is that it would allow the 3801 to meet
> European ETSI dc voltage standards that goes up to 75VDC on the telco
> battery bus. US can reach 56 VDC.
> Anyhow if thats your only problem then you can solve the problem.
> Regards
> Paul
> WB8TSL
>
> On Thu, Feb 4, 2016 at 1:39 PM, Artek Manuals <Manuals at artekmanuals.com>
> wrote:
>
>> Wes
>>
>> Some one reversed engineered the supply about 10 years ago and they posted
>> the schematic on the WEB....The web link I have no longer works so I will
>> email you the schematics of the supply direct.
>>
>> I will check to see if the files are not already up on KO4BB and if not I
>> will post them up there for every one
>>
>>
>> That being said while troubleshooting my own supply this week I have
>> learned the following
>> 1) The supply  ( is not a switcher) can be troubleshot on the bench
>> removed ( and unplugged from from the Z3801A.
>> 2) The supply is basically A pre-regulator and two DC-DC converters.By
>> cutting one trace you can separate the two and bypass the preregulator
>> which seems to me to be overkill if you using a good regulated DC supply to
>> feed the thing 36 or more volts into the DC/DC converters is fine
>> 3) The smaller DC-DC converter supplies 5V only ( probably for the
>> receiver ???)
>> 4) The larger Lucent converter supplies =15V / -15V /+5V
>> 5) all the DC-DC outputs can be supplied with separate DC supplies of good
>> quality
>>
>>
>>
>> Dave
>> NR1DX
>> ArtekManuals.com
>>
>>
>>
>>
>>
>>
>> On 2/4/2016 12:17 PM, Wes Atchison wrote:
>>
>>> My HPZ3801 has died.  It appears the internal DC to DC converters have
>>> died.
>>> The fuses (4) I have found on the boards check good with an ohmmeter.  I
>>> have checked voltage on test points where labeled as a supply.  No
>>> voltages
>>> present.  Is there a schematic available somewhere?  Has anyone repaired a
>>> Z3801 with similar problems?
>>>
>>> Thanks for any help.
>>>
>>>
>>>
>>> 73,
>>>
>>> Wes
>>>
>>> WA5TKU
>>>
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>>
>> --
>> Dave
>> Manuals at ArtekManuals.com
>> www.ArtekManuals.com
>>
>> ---
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