Instruction manual

CI-ControlWaveLP Service / 3-5
5. Carefully disconnect the CPU Board from the FMI/OB Board.
6. Loosen the two screws (C) that secure the PSSB Board to the FMI/OB (see Figures 3-1
& 3-2).
7. Carefully disconnect the PSSB Board (Connector P1) from FMI/OB Board (Connector
P9).
8. To replace the FMI/OB Board follow steps 1 through 7 in reverse order, replacing rather
than removing the item in question.
3.1.5 Analog Input Circuitry Calibration
Full calibration requires the use of the WINDIAG program (see D4041A). Analog Input
calibration is performed with the use of two potentiometers on the FMI/OB Board (see
Figure 3-4). Potentiometers R111 (1V) and R112 (5V) are used in conjunction with the
analog gain and offset adjustments. An external voltage source connected to the first
Analog Input channel (AI1) is required.
Figure 3-4 - FMI/OB Board AI Circuitry Calibration Diagram
The subsystem gain calibration is performed in conjunction with R111 when the 1V
external reference is selected and the offset calibration is performed in conjunction with
R112 when the 5V external reference is selected. There is some interaction between gain
and offset so the calibration steps have to be repeated until adjustment is not required. The
offset (1V) should be calibrated first