Gilderfluke&Co Back to the Future - Manual (Page 4)

4) E-Speedo CPU: This is a small printed circuit board that mounts directly behind the E-Speedo
display printed circuit board.
This printed circuit board receives the data for displaying via the RS-422 9600 baud serial
link from the main dashboard CPU printed circuit board. A Z8 microcontroller on this printed
circuit board decodes this data and multiplexes it (one of three) to the the displays. A five volt
integrated switching regulator on this printed circuit board provides both logic and display
power. All socketed ICs are held in place by pull ties.
5, 6, & 7) Roentgen Gauge Breakouts: Three small circuit printed circuit boards that attach di-
rectly to the back of the 0-10 volt Roentgen Gauge meter movements to ease attaching
them to the BttF2. Two of the gauges are Simpson 08890 2.5” gauges. The last gauge is a
Simpson 07660 4.5” gauge. Unlike the original installations, each gauge gets one of three
separate analog signals in the six position RJ-12 cable that daisy chains from the BttF2
through all three of these cards. Each card is labeled ‘A’, ‘B’, or ‘C’ to indicate which of the
analog signals will be used on that gauge. The polarity and identity of these cards is clearly
marked on each. Card ‘A’ is shown below.
8) Keypad Breakout: This small printed circuit board breaks out the eight position RJ-45 to dis-
crete wire connections for each of the lights on the keypad assembly. There are no connec-
tions to the keypad itself, as it is purely decorative. On the original attractions, the four lights
were controlled on just two circuits (three of the four lights were hardwired together). The BttF2
provides individual programmed controls to each light. The polarity of each connection is
clearly marked on this card.
G ILDERFLUKE & C O . • 205 S OUTH F LOWER S TREET • B URBANK , C ALIFORNIA 91502 • 818/840-9484 • 800/776-5972 • FAX 818/840-9485
E AST C OAST /F LORIDA O FFICE • 7041 G RAND N ATIONAL D RIVE • S UITE 128d • O RLANDO , F L 32819 • 407/354-5954 • FAX 407/354-5955
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