Internal Arrangement; Cleaning; Vehicle Power Option; Fuse Replacement - Honeywell SC Series Installation Instructions Manual

Signal Conditioning, Self Calibrating Digital Indicators

4.3.7 Internal Arrangement

The figure below shows the names and locations of the printed
circuit boards.

Figure 4-3: Internal Arrangement of SC2000

Below is a description of each printed circuit board.
• The SensoBus Backplane Board serves as the connection
between all boards in the instrument.
• The Front Panel/Display Board Assembly contains the dis-
play and all front panel controls.
• The Power Supply Board contains the +15V, -15V and +5V
power supplies.
• The Microprocessor Board contains the microprocessor,
ROM software storage chip, and the System connector.
• The Hardware Input/Output Channel Boards plug into the
remaining four slots of the SensoBus Backplane Board.

4.3.8 Cleaning

Turn off the instrument and unplug all connectors. Use a soft
cloth or tissue and a mild cleaner. Do not use liquid or aerosol
cleaners. Do not allow any cleaner inside the instrument.

4.3.9 Vehicle Power Option

Model SC2000 instruments are available with a vehicle power op-
tion for operation with batteries and linear dc power supplies. See
"Specifications" on page 9 voltage and power requirements.
NOTICE
Due to the momentary startup inrush current of the instru-
ment's power supply, the use of switching power supplies with
the SC are not recommended.
12 Honeywell Sensing and Control

4.3.10 Fuse Replacement

The power-line fuses of AC-powered instruments are located
within the instrument's power entry module on the rear panel. Use
two 2A, 250V fast-blow fuses (p/n 029-3026-00).
008-0608-00
Rev. G,