Lexmark X7500 Service Manual - Page 134

Wiring Diagrams and Signal Information, P28 and J28

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4036-501 Wiring Diagrams and Signal Information This section of the manual contains block diagrams (BD) to better illustrate the electrical relationships between components and assemblies within the Scanner Module. Each wire in the diagrams is tagged with a signal name, and each wire is terminated at both ends with a pin number. Wiring Diagram Notations The wiring diagrams in this manual use the following circuit notations to describe components and signal paths within the printer. A plug A jack Connection of pin 15 between P28 and J28 The signal name of a wire Voltage measured with the negative probe of the meter on SG Voltage value of a signal / = The voltage goes LOW when the signal is ON. In this case, the HEAT signal is ON, so the normal voltage of 4.2VDC drops to 0VDC. There is continuity between SG and RTN. Continuity between FG and SG depends on circuit specifications. GND=GROUND SGND=SIGNAL GROUND PGND=FRAME GROUND RTN=RETURN $$ in a signal name indicates the signal is coming from the MCU CPU. ## in a signal name indicates the signal is going to the MCU CPU. #$Interactive communication signal ##Analog signal 5-8 Service Manual

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5-8
Service Manual
4036-501
Wiring Diagrams and Signal Information
This section of the manual contains block diagrams (BD) to better illustrate the electrical
relationships between components and assemblies within the Scanner Module. Each
wire in the diagrams is tagged with a signal name, and each wire is terminated at both
ends with a pin number.
Wiring Diagram Notations
The wiring diagrams in this manual use the following circuit notations to describe
components and signal paths within the printer.
/ = The voltage goes LOW when the signal is ON.
In this case, the HEAT signal is ON, so the normal voltage of 4.2VDC drops to 0VDC.
There is continuity between SG and RTN. Continuity between FG and SG depends on
circuit specifications.
GND=GROUND
SGND=SIGNAL GROUND
PGND=FRAME GROUND
RTN=RETURN
$$ in a signal name indicates the signal is coming from the MCU CPU.
## in a signal name indicates the signal is going to the MCU CPU.
#$Interactive communication signal
##Analog signal
A plug
A jack
Connection of pin 15 between
P28 and J28
The signal name of a wire
Voltage value of a signal
Voltage measured with the
negative probe of the meter on
SG