Logical Symbols; Graphic Symbols - Ford TRADER Workshop Manual

HOW TO USE THIS WIRING DIAGRAM
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SYMBOLS IN THIS WIRING DIAGRAM
LOGICAL SYMBOLS
The logical symbols are of four kinds: OR, AND, INV (Inverter). PROCESS.
The circuit operation can be easily read by understanding these symbols.
OR
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In case of input to either A or B, an output
A
\I~~'\
:D-c
comes out from C.
When A and 8 are OFF (OV). C is OFF (OV).
C
When either A or 8 is ON (12V). C is ON (12V).
B
I
'''l'_V
This is shown in the relay circuit on the right.
,
AND
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In case of input to both A and B. an output
:s-c
comes out from C.
~o-C
When A and B are ON (12V), C is ON (12V).
When either A or B is OFF (OV), C is OFF (OV).
This is shown in the relay circuit on the right.
INV. (Inverter)
In case of input to A, B is grounded.
~ower
A - { > o - B
Wl:!en A is OFF (OV), B is ON (12V).
A-J_~ij
B
When A is ON (12V), B is OFF (OV}.
.'
This is shown in the relay circuit on the right.
/ 7
,5.----
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PROCESS makes a simplified representation of
complicated functions of the circuit.
r --------,
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Signal converter
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...r----,
Functions mainly used:
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1
I
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1. Detection of signals ----1
Coil signal
I
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10-
I converted to ~-
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2. Conversion of signals
I
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~
____ J
The process of the full transistor ignition con-
- ON-OFF signal
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L.... _ _ _ _ _ _ _ _ .....
trol unit is as shown at the right.
GRAPHIC SYMBOLS
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*
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®
~
!
$
~
I
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Harness Body
Holder
Box
Battery Ground Fuse Main Fuse
Motor
,
~
~
f
~l
00
t
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Coil solenoid Resistance
Variable resistance
Thermister Diode
1
~ ~
0
$
~
T
Condenser
Transistor
Pump Lamp Horn
DJ
@!
~
¥
t
Speaker
Cigarette lighter
Heater Illuminated Diode Zener Diode
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