Page 8 MS - SOUND decoders MS440 to MS990 and MN - NON-SOUND decoders MN170 to MN340
MS450P22, MS450P16 Top side (with PluX22, -16)
MS450, MS450R, MS450F Top side with wires
MS440C, MS440D Top side, with 21MTC, SOUND
NOTE: External capacitors on MS440, MS450
Capacitors (Elkos, Supercaps) of any capacity can be connected to “Capacitor positive” (to
ROUND) WITHOUT additional components; they do NOT have to be able to handle full running volt-
age; 16 V is enough. Prerequisites for the connection for the stay-alive capacitor within the decoder
prevent an inrush current too high and enable undisturbed Service Monde programming, software
updates, sound loading, also with higher capacities and use the memory the best possible way.
MS450 all types Bottom side (example with wires)
MS440C, D Bottom side, with 21MTC, SOUND
Servo control lines on SUSI pins (applies to all decoders except large-scale)"
Servo control lines on the SUSI pins are activated by CVs #181, #182). These connections work with
a voltage level of 3.3 V (difference to MX decoders where 5 V).
Some servos do NOT work with 3.3 V! Possible remedy: lower the supply voltage (normal 5 V)
to about 4 V; otherwise, only replacement will help; digital servos are better!
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