Model 106-H Ozone Monitor Manual Rev. D-2
22
Cell Dirty LED is ON
during the auto-zero.
Absorption cell is dirty.
Poor instrument zero.
Replace absorption cell, or
return to 2B Tech for cell
cleaning or replacement.
Zero the instrument.
Display is blank or
nonsense.
Bad connection of display
to circuit board.
Remove top cover and
reconnect display to circuit
board. Check solder
connections to display. A
new LCD may be required.
Cell temperature reads
low by s
everal 10’s of
degrees.
Absent or loose connection
of temperature probe cable
to circuit board.
Remove top cover and
reattach connector to circuit
board (see Fig. 7.1).
Analog output is
constant or does not
track front display.
Cable not properly
connected between analog
output and recording
device.
Wrong scaling factor
selected In menu.
Check continuity of your
analog cable to your
recording device and make
sure correct connector pins
are being used (see Section
3.16).
Check and reset analog
output scaling factor in the
Menu.
Select switch does not
work.
Bad solder joint to circuit
board or damaged select
switch.
Remove top cover and check
solder connection to select
switch. It may be necessary
to replace the select switch.
Serial port does not
work.
Wrong serial cable used.
Wrong baud rate selected.
A “straight through” serial
cable is provided. Some
data collection devices
require a ”cross over” cable
in which pins 1 and 3 are
exchanged between the two
ends of the cable. Use a
“cross over cable or
additional connector that
switches pins 1 and 3.
Make sure that the baud rate
chosen in the menu matches
the baud rate setting of your
data acquisition program.
