Teledyne 9110EH - Nitrogen Oxides Analyzer - Manual (Page 210)

Troubleshooting & Repair Model 9110EH Instruction Manual
voltage of an input signal or to control the state of an output voltage or control signal. The
specific parameter will vary depending on the situation.
SAMPLE RANGE = 500.0 PPB
NOX=XXX.X
SETUP
CFG DAS RNGE PASS CLK MORE
SETUP
COMM VARS DIAG HALT
Exit returns to
DIAG display & all
values return to software
DIAG SIGNAL I/O
PREV NEXT
ENTR EXIT
If parameter is an
input signal
DIAG I/O 0 ) EXT_ZERO_CAL=ON
PREV NEXT JUMP
PRNT
DIAG I/O 19 ) REACTION
CELL_HEATER=ON
SETUP ENTER DIAG PASS: 818
8 1 8
ENTR
DIAG I/O 29) PMT_TEMP=378.3 MV
PREV NEXT JUMP
PRNT
DIAG I/O 19 ) REACTION
CELL_HEATER=OFF
If parameter is an
output signal or
Toggles
parameter
ON/Off
Press ENTR to
enter the
Press ENTR again
to enter the
SIGNAL I/O menu
Press PREV or
NEXT to scroll
between available
I/O parameters
Figure 11-2: Switching Signal I/O Functions
11.1.4. Status LED’s
Several color-coded, light-emitting diodes (LED) are located inside the instrument to
determine if the analyzer’s CPU, I 2 C communications bus and the relay board are
functioning properly.
11.1.4.1. Motherboard Status Indicator (Watchdog)
A red LED labeled DS5 in the upper portion of the motherboard (Figure 11-3), just to the
right of the CPU board, flashes when the CPU is running the main program. After power-up,
DS5 should flash on and off about once per second. If characters are visible on the front
panel display but DS5 does not flash then the program files have become corrupted.
Contact customer service because it may be possible to recover operation of the analyzer. If
30 - 60 seconds after a restart neither DS5 is flashing nor any characters are visible on the
front panel display, the firmware may be corrupted or the CPU may be defective. If DS5 is
permanently off or permanently on, the CPU board is likely locked up and the analyzer
should not respond (either with locked-up or dark front panel).
196 M9110EH Rev 0