Light Leak Check Procedure; Eprom Replacement Procedure - Teledyne 6400A Instruction Manual

Sulfur dioxide analyzer

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TAI Model 6400A SO

10. Verify leak by pressurizing the pneumatic system and close the shut-off valve. If the gauge

pressure drops more than 1 PSI within 5 minutes, then repeat steps 7 through 10 until the

leak stops.

11. When no more leaks can be found reinstall inlet and outlet fittings of the pump, remove the

cap from the sample inlet port and the plug from the zero air scrubber.

8.9 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.

1. Turn the instrument power 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 from 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 EPROM chip should be at the top center. The current chip

should be labeled with something like "TAI SO

prom on CPU card. Gently pry the chip from its socket and replace it carefully with the new

chip. Install the chip in the left 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 6400A 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. All setup variables are stored in the E

EPROM. Check all settings to make sure that expected setup parameters are present.

Re-calibrate the machine so that the default slope and offset are entered.

Analyzer Operator Manual, 02164, Rev. G

H.1 - - -". See Figure 9-1 for location of

PROM and should not be affected while changing

8-10

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