Instruction manual

DDF1  23
CONTROL AND DIRECTION INDICATOR ASSEMBLY
In these assembly steps for the DDF1 main board, the components will be
mounted to the SOLDER SIDE of the circuit board. That’s the other side of
the board from the previous steps and with the least amount of printing on it.
Make sure the cover with the sticker you applied is dry and the sticker
is firmly attached before starting this part of the assembly.
100. Find the 3 DPDT slide switches. Looking at the bottom of the circuit
board locate the positions of S1, S2, and S3 switches. Insert a switch
into each location. It doesn’t matter how the switches are oriented, just
make sure each switch is flush to the circuit board. Check the place-
ment of each switch by “test fitting” the circuit board into the upper half of
the case assembly and ensure it operates smoothly. Make any adjust-
ments required so they operate smoothly and then solder them on the
other side of the board, (not to be confused with the other side of the
tracks).
101. Locate the 10K potentiometer, labeled 10K or 103, on the side of
the pot. Install this potentiometer in the R50 position. Once again make
sure that this control is mounted flush to the circuit board and solder into
place.
102. Locate the two(2) 500K, labeled 500K or 505, potentiometers and
install them in the same way in the locations for R19 and R36 in the
same manner as above.
Locate the 18 red and one green LED’s. Look closely at one of these LED’s
and notice one lead is shorter than the other. This lead is the cathode or
negative lead of the LED. Also notice that the plastic case has a flat area on
the same side as this lead. The longer of the two leads is the anode, or (+)
connection.
When installing these LED’s the SHORT LEAD/FLAT AREA must be in-
serted in the rectangular pad and the flat area must match the printed sym-
bol on the board.
These are the direction heading and level indication LED’s and they should
be installed so they extend through top panel of the unit the same distance.
These LED’s are also inserted from the back side of the board matching the
printed symbols. The following steps will assure the correct installation and
height.
103. Insert, BUT DO NOT SOLDER
, the 18 RED LED’s into the loca-
tions D3, 4, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32.
104. Insert, BUT DO NOT SOLDER
, the GREEN LED into location D16.