[time-nuts] Hp 10544A repair

Luca Dal Passo iw2lje at gmail.com
Sun Apr 26 02:55:28 EDT 2015

Hi all,
    Have anyone some experience about 10544A repair? I've recently fixed a
10811A, and it is relatively easy to disassemble, but 10544 has not screws
and the manual does not deal about servicing. Can i try to open the box by
removing the white plastic tips without demage something? And then how to
correctly extract the inner stuff? The malfunction is that the oven monitor
signal is bad and the 10MHz signal has low amplitude and very bad shape
(distorted), but the output frequency is ok and oven heather and
control seems to be ok too (current drain from power supply is ok). So
there are probably some defective components in the output buffer zone of
the circuit. Another question is that the schematic (thanks to KO4BB!)
seems to have a mistake about drawing of the oven monitor signal (the pin
11 wire is taken between the thermal fuse and the power darlington: how
does can it work in that way?).
Thanks and regards

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