SonTek/YSI
56
ADVField Operation Manual (September 1, 2001)
4.4. Accessing the ADVField Processing Module
Under normal operating conditions, you should not need to access the ADVField processing
module. The most common reason for accessing the processing module is to change batteries for
autonomous systems. It may occasionally be necessary to check the input power fuse located on
the Analog board, or to install a new EPROM on the CPU or DSP board. This section provides
instructions to access the electronics, perform typical internal operations, and close the system.
The instructions are divided into sections for each different system configuration and for the
most common internal operations that need to be performed.
• Accessing the ADVField splash-proof housing
• Accessing the ADVField rectangular underwater canister
• Accessing the ADVField round underwater canister
• Changing batteries in the ADVField round underwater canister
• Accessing the hardware switches and jumpers
• Testing the input power fuse
• Replacing the CPU and/or DSP EPROM
4.4.1. Accessing the ADVField Splash-Proof Housing
The following instructions are for the ADVField in the splash-proof housing without the re-
chargeable battery; see §4.5 for systems with the rechargeable battery.
To open the housing
:
1. Remove the four #4-40 screws at each corner of the front end plate.
2. Lift the front end plate from the housing. The junction between the end plate and housing is
sealed with a gasket (waterproof, but not intended for submersion), so it may take some effort
remove the plate; prying one edge up is a good way to start.
3. Pull the end plate straight out from the housing. Several cables join the end plate to the elec-
tronics, and the electronics should slide smoothly out of the housing. Remove the electronics
completely from the housing and place the assembly in a static-safe area.
To disassemble the processor board stack
:
1. Note the position and orientation of the cables from the end plate to the electronics. See §4.1
for the location of the connectors referred to below.
2. Remove the red, 2-pin input power connector from the Analog board. This cable goes to the
power switch on the end plate.
3. Remove the red, 2-pin diode connector from the Analog board. This cable goes to the diode
on the end plate.
4. Remove the black, 16-pin probe connector from the Analog board. This cable goes to the
DB25 connector on the end plate.
5. If present (i.e., temperature or pressure sensor is installed), remove the black, 10-pin tempera-
ture/pressure connector from the Analog board. This cable goes to the DB25 connector on the
end plate. This connector is not keyed. It should be oriented such that the two wires are con-
nected to the pins farthest from the input power connector.
6. Remove the black, 16-pin auxiliary input/output connector from the DSP board. This cable
goes to the DB15 connector on the end plate.
7. Remove the black, 10-pin serial communication connector from the CPU board. This cable
goes to the DB9 connector on the end plate. The end plate should now be completely discon-
nected from the board stack.
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