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Teledyne API Model 200A NO
X
Analyzer Instruction Manual, 02246, Rev. G, DCN 5247
8-16
PRINTED DOCUMENTS ARE UNCONTROLLED
8.10 Light Leak Check Procedure
1. Scroll the TEST functions to PMT.
2.
Input zero gas.
3.
Shine a powerful flashlight or portable incandescent light at the inlet and outlet fitting,
and at all the joints of the reaction cell. The PMT value should not respond to the light.
If there is a response, tighten the joints or replace the tubing with new black PTFE tubing. We
often find light leaks are caused by o-rings being left out of the assembly.
8.11 Prom Replacement Procedure
Preparation: If any setup changes such as RANGE, AUTOCAL, IZS ON/OFF etc. have been
made, record the changes because all settings should be checked after the PROM is changed. See
Table 9-9-8 for location of prom on CPU card.
1.
Turn the machine off.
2.
Remove the hold down screw that holds in the V/F-CPU assembly to the motherboard.
Disconnect the J9 power connector from the motherboard. Gently lift the assembly far
enough out of the instrument to remove the connector to the display and the RS-232
connector.
3.
The CPU board is attached to the larger V/F board.
4.
Remove the board, laying it down on an insulating surface such that the board edge pins
on the PCB are on the left. The PROM chip should be at the top center. The current chip
should be labeled with something like "210H9 - - -". See Table 9-9-8 for prom location.
Gently pry the chip from its socket and replace it with the new chip. Install the chip in the
lef
t end of the socket with the notch facing to the right. Make sure that all of the legs insert
into the socket correctly.
5.
Re-attach the CPU board to the V/F board, and re-attach the assembly to the
motherboard.
6.
Turn the M200A ON and observe the front panel display. As the machine goes through
the setup the version number will be displayed on the front panel. It should read the same as
the version number printed on the prom.
7.
Re-enter any non-default settings such as RANGE or AUTOCAL. Re-enter the SPAN
values in the CAL-CONC menu. Check all settings to make sure that expected setup
parameters are present.
8.
Re-calibrate the Analyzer so that the default slope and intercept are overwritten with the
correct values.