H0 Sound Decoder MX640 Page 41
input changes); their own brand decoder is the only one that is being taken into account through all this.
The installation of other brand decoders is, to be sure, undesired…
Next find the same pins on the processor of your board and follow those tracers carefully. They should lead
to resistors marked as either “104” or as “000” (see below). If they are “104” proceed with the decoder in-
stallation. If they are marked as “000” they have to be replaced before the decoder is installed.
CORRECTIVE MEASURE:
The
MX640C must not
be installed if zero-ohm resistors (markings
“000”
) are
found on the loco board instead of functional protective resistors (“104”).
In any case, due to the numerous and undocumented changes of these boards, ZIMO cannot as-
sume liability for damage to loco boards and/or decoders.
It is imperative that these are being replaced with
100KO resistors (“104”)
before installing the decoder.
ZIMO MX640C decoders will be delivered with the necessary resistors.
Below is a picture showing a loco board with the useless (“000”) resistors; in such cases it is not allowed to
plug in a MX640C decoder!
This picture shows a different Märklin C-Sinus board and how the resistors in queston can be located by
following the tracers back from the controller pins.
Due to the many different C-Sinus boards that have been produced it is impossible for us to provide precise
information about the location of these resistors on each board. Because the resistors may be mounted in
different locations on the board in your engine, we would suggest that you find them by following the trac-
ers. First study the picture below. The blue and pink arrows are pointing out the tracers that connect these
resistors with the processor. Note the processor pins those tracers are leading to.