TTI TSX Series Service Manual page 11

System Shutdown - Shutdown of both switchmode and linear regulators is asserted via IC9-A of
the supervisory logic following power up, detection of inadequate auxiliary supplies, tripping of the
master fault latch or, in programmable versions, during CPU board driven resetting of that latch.
Output Circuit Components - C16 and C34 assist linear regulator stability. D37 protects against
reverse polarity connection of external batteries or other power supplies to the output. Coaxial
toroidal choke L4 and front panel mounted ceramic capacitors CA,CB,CC form a lowpass HF filter
attenuating common mode and differential noise generated within the power supply.
R57,58 maintain a working connection between output and sense terminals if the latter are left
disconnected. R96,C51 and R97,C53 assist stability when remote sensing is used.
Voltage and Current Metering Points - Chain R17,R59,VR4,R211 attenuates the voltage sense
p.d. to feed the multiplexed differential input ADC on the control/CPU board from PJ1-2 and PJ1-
4. The current signal is taken directly from the current sense network to feed the ADC from PJ1-5
and PJ1-3.
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