Circuit Board Identification - Hach 900 MAX Instrument Manual

7.7 Circuit Board Identification

Figure 31 CPU Board
ID
J1
J2
J3
J4
J5 Memory Backup Battery Pack
J6
8990mnt.fm
There are two main circuit boards in the sampler; the Utility Board and the
CPU board. The CPU board is attached to the bottom panel and the Utility
board is located inside the control housing behind the motor/gearbox
assembly.
Note: Removal and handling of the circuit boards used in the sampler requires
knowledge of ESD (Electro-Static Discharge) precautions and the CMOS
(Complementary Metal-Oxide Semiconductor) circuit components used in the
sampler. Static electricity has the potential to damage the CMOS components of
the sampler when the boards are unplugged and removed from the case.
Precautions must be taken to assure static-free personnel and work area prior to
handling the circuit boards.
J6
J10
CPU BOARD
J11
Table 20 CPU Board Connectors
Description
Liquid Crystal Display
Mechanical Totalizer
not used
Base Board
RS232 Serial Port
J9
J4
J5
J8
J2
ID
J7 RS485 Submerged Pressure Transducer
J8
J9 Liquid Crystal Display (LED back-light)
J10
J11
Section 7
J7
J1
F1
Description
Modem Option Module
Keypad
not used
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Circuit Board Identification