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Teledyne API Model 100AH SO
2
Analyzer Instruction Manual, 02417, Rev. D
9.9 EPROM Replacement Procedure
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 "M100AH B.1 - - -". See Figure 10-1 for location of
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 M100AH 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
2
PROM and should not be affected while changing
EPROM. Check all settings to make sure that expected setup parameters are present.
8. Re-calibrate the machine so that the default slope and offset are entered.
9-10