Chapter 3
Theory of Operation
Focus 30/35 Service Manual 3 - 48 P/N 79000035_SM, Version 1.5
Main control board MCB
Location of MCB
Fig. 3-45 Location of Main control board MCB
Technical specification
Functional description
The MCB board is the main board in the instrument. On the board are two micoprocessors. The IM-
Instrumentmanager contains storage of firmware, memory circuits (e.g. Error and Eventlog file),
power managment, controls the internal sensors and satellites.
The Angle-drive control manager calculates angles with the raw data delivered by the angle and tilt
sensors and controls the motor drive system.
The IM communicates to all sensors and units direct or via USB hub. There are three hubs in the USB
structure, two on the MCB and one in the telescope on the Tracker servo focus TSF board to connect
the tracker, servo focus and EDM.
IM is the host when communicating with internal units, in case of communicating via footconnector,
IM can be either host or device mode depending on the external unit.
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