SonTek/YSI Argonaut-XR Technical Manual - HydroScientific West

Argonaut Operation Manual Firmware Version 7.9 (May 1, 2001)
SonTek/YSI
4. Connect the 5-pin red compass/tilt sensor connector from the CPU board (labeled Compass
on the CPU board). The connector is keyed and can only be installed in one direction.
5. Check all other internal wiring (§5.2.2 and §5.3) to be sure it is installed correctly and
securely.
6. Carefully insert the head into the pressure housing, aligning the holes on the head with the
holes in the housing. The asymmetric bolt pattern allows only one orientation.
7. Secure the head to the housing using the three screws (each with plastic isolator and washer);
tighten snugly, but do not over tighten as this can damage the housing.
5.6.3. Replacing the CPU EPROM and Other Programmable Chips
The Argonaut processor includes three programmable chips: the CPU EPROM, the analog
timing controller, and the CPU timing controller. See §5.3 for the location and description of the
function of these chips. Upgrades for these chips (most commonly the CPU EPROM) may be
periodically available from SonTek. Basic installation instructions are given below. See §5.2 and
§5.3 for descriptions of the internal mounting, wiring, and Argonaut processor.
Accessing the processor
1. Perform all maintenance in a static safe environment.
2. Access the system electronics following the instructions in §5.6.1 and §5.6.2.
3. Make note of the orientation of the processor boards before removing.
4. Remove all connectors from the analog board.
5. Remove the four #4-40 screws holding the analog board to the CPU board.
6. Lift the analog board straight up to disconnect the edge connector to the CPU board. Take
care not to bend or damage any pins on the connector.
7. Remove all connectors from the CPU board.
8. Remove the four hex standoffs holding the CPU board to the mounting hardware.
Replacing the chips
The exact procedure depends on which chip(s) are to be replaced. Please note that the chips used
for the analog and CPU timing controller use the same package, but they are not interchangeable.
Be certain that you install the correct chip in the correct socket when replacing these controllers,
or the system will not operate.
Either timing controller chip can be removed using a small flat blade screwdriver. Carefully pry
each edge of the chip up until you can lift the chip up by hand. When installing the new chip,
align the semi-circle on the chip with the semi-circle shown on the socket and circuit board. Take
care not to bend or damage any pins when installing the chip. Seat the chip securely by hand.
Keep the old chip in a static safe bag until you have verified system operation (after verifying
operation it can be discarded).
When replacing the CPU EPROM, a special chip removal tool (called a PLCC extractor) is
required to remove the old chip. With this tool, the two ends are placed on two corners of the
chip socket; compressing the tool will lift the EPROM from the socket. When installing the new
chip, align the rounded corner of the chip with the similar corner of the socket. Lay the chip on
the socket and align each pin with the corresponding groove. Firmly press the chip into the
socket until it is securely set. Keep the old EPROM in a static safe bag until you have verified
system operation (after verifying operation it can be discarded).
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