Motorola FD-1 - Manual (Page 12)

English FD-1
Page 26
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You can connect several LEDs in parallel to each output. In this case every
LED must have a series resistor of its own. If you connect several LEDs to
one output in series, only one series resistor is needed. The number of LEDs
connected in series to one output depends on the digital voltage.
You can determine the number of the LEDs that can be connected in
series to one output from the following formula:
(number of LEDs + 2) x 1,5 < digital voltage
Fixing the decoder
After completing all connections fix the decoder with double-sided
adhesive tape, for example.
Setting the decoder adress
The decoder can be set to one of 80 addresses. The setting is made by
mounting solderbridges between the pins X1 to X4. The assignment is
shown in the list on page 54.
The decoder is set to the address 79 by the manufacturer.
Caution:
Use a soldering iron with a small tapered point and max. 30 Watt to
make the solderbridges. Take special care to avoid short circuits. If
necessary, check the solderbridges with a magnifiying glass to make
sure that the solderbridges are closed correctly and solder has not
short-circuited adjacent components or connections.