Cameron NUFLO 1141C, User Manual

Page: 29 / 120

Chapter 3: Main Circuit Board Wiring
29
Switches, Jumpers, and Potentiometers
Note: It is very IMPORTANT that the following jumper settings be observed:
CN11 – “RAM Size” jumper; “High” is 96 kbytes, “Low” is 64 kbytes
CN20 – “Backup Batt” jumper; position across upper pins to enable backup battery power
for non volatile memory (NVRAM).
CN21 - “LCD PwrSav” jumper; for optional backlight displays, position jumper across
upper pins to shut off display when inactive; position jumper across lower pins to turn off
backlighting only during periods of inactivity.
Table 3.1 summarizes the switches, jumpers and potentiometers located on the main board. They are
organized in the order they appear on the board, from top to bottom along the left side of the board.
Table 3.1—Switches, Jumpers and Potentiometers
Component
# Description Function Step(s) for
Enabling/Disabling
SW11 Config Lock Prevents superbooting of the
Scanner; prevents changes
to many items in flow run
configuration. Tighten the screw to lock the
switch. See
Config Lock
(SW11) page 31 .
SW9 Pwr Supplies power to the
Scanner in the On position;
provides for properly
supervised system shutdown
in the Off position. Move switch in the “down”
position to turn power off.
Move switch in the “up”
position to turn the power
on.
SW8 Display Wakeup Turns on the display when it
has timed out and shut down Press button to turn on the
display.
P3 Contrast Adjusts LCD contrast
Using a small slotted
screwdriver, rotate the
control clockwise to increase
contrast; rotate
counterclockwise to
decrease contrast.
P2 Bklight Adjusts backlight brightness
(only functions if backlit
option is installed) Using a small slotted
screwdriver, rotate the
control clockwise to increase
brightness; rotate
counterclockwise to
decrease brightness.
CN21 LCD PwrSav Allows the display optional
backlight to timeout (turn off)
separate from the display,
during periods of inactivity to
conserve power. Position jumper across
upper pins for display and
backlight timeout; position
jumper across bottom pins
for backlight only timeout.