Hi Richard,
may I ask you to send to me that Schematic?
thank you in advance
73
KJ6UHN Alex
On 4/24/2019 7:46 AM, RICHARD GOLDING via time-nuts wrote:
Many thanks to those who took the trouble to send me schematics of the Z3801a
PSU.
I'm pleased to report that, using, the schematic, I was able to trace and fix
the fault and that GPS lock led is glowing again.
The problem was a faulty regulator IC (U2 LM317) that had decided to produce
1.8V instead of 2.5V, which resulted in the PSU thinking that the input supply
voltage was out of range.
It does seem a very complicated circuit for what could be straightforward
voltage window comparator. i.e. 24R's, 8 Diodes, 3 regulators, a comparator and
logic IC + a handful of Mosfets!
Thanks again for those that helped.
73 Richard, G3VZG
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