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
manu...@artekmanuals.com
www.ArtekManuals.com
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