SonTek/YSI
ADVField/Hydra Operation Manual (September 1, 2001) 63
4.4.5. Accessing the Hardware Switches and Jumpers
Hardware settings (in three places on the ADVField processing module) are used to determine
the system configuration. See §4.1 for the exact location of each of these areas and §4.2 for de-
tails on individual switch and jumper settings.
A set of switches on the Analog board determines system orientation and which optional sensors
are installed. These switches can be accessed by opening the processing module, but without dis-
assembling the board stack. Use a small flat-blade screwdriver to change the switch settings.
Two hex rotary switches on the CPU board are used to set the baud rate for serial communication
and the address for RS485 communication protocol. These switches are accessed from the side,
and can be changed by opening the processing module, but without disassembling the board
stack. Use a small flat-blade screwdriver to change the switch settings.
A set of eight jumpers on the CPU board is used to determine the serial communication protocol.
The processing module must be opened and the board stack disassembled to access these jump-
ers. Use your fingers or a pair of needle nose pliers to remove and install the jumpers.
4.4.6. Testing the Input Power Fuse
The ADVField electronics has an input power fuse to protect the electronics from high input
voltages or surges in input current. The fuse is located on the Analog board near the red, 2-pin
input power connector (see §4.1). A 3.15A, fast-acting fuse in a black cylindrical package (0.8
cm; 0.3” diameter) is used. The fuse has two pins that plug into a socket on the Analog board.
The orientation of the fuse in this socket does not matter.
If you are unable to establish communication with the ADVField, and measurements show that
the processing module is not drawing any current when input power is applied, the fuse may be
blown. Test, and if necessary, replace the fuse using the following steps.
1. Open the processing module (see applicable part of §4.4).
2. Lift the fuse from its socket on the Analog board and test for continuity between the two pins.
If the circuit is open, the fuse has been blown and needs to be replaced. Spare fuses are in-
cluded in the ADV tool kit.
3. Re-install the old fuse (if intact) or a new fuse into the Analog board socket.
4. Close the processing module.
4.4.7. Replacing the CPU or DSP EPROM
Periodically, SonTek may provide firmware upgrades for the EPROM used to control the CPU or
DSP. These are done to provide access to new data collection features or to enable custom capa-
bilities (the CPU firmware is more commonly replaced; DSP firmware changes are quite rare).
The EPROM is replaced using the following steps.
1. Open the processing module (see applicable part of §4.4).
2. Disassemble the processing module board stack to provide access to the DSP or CPU board,
depending on which EPROM needs to be replaced.
3. Locate the chip to be replaced on the DSP or CPU board. The EPROM should have a label
on the chip that clearly identifies it (see the diagrams in §4.1 for the exact locations)
4. Carefully remove the old EPROM. This is done using a small flat-blade screwdriver to gradu-
ally lift each end of the chip until it can be removed by hand. Store the old EPROM in a
static-safe environment until system operation has been tested using the new EPROM.
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