Setup and Testing
Page 19 of 31
Doc No.: MAN01502, 27-02-01 SCA 300 Manual
3 SETUP AND TESTING
WARNING: ALL SET UP AND TESTING PROCEDURES MUST BE PERFORMED
WHILE THE VESSEL IS STATIONARY AND NOT UNDERWAY.
Adjustments to the SCA 300 are made at the trimmer potentiometers (trim pots) located
on the amplifier's circuit board. Each trim-pot can be located by reading the labels on
the SCA 300’s circuit board or by referring to Figure 12.
WARNING: TO AVOID POSSIBLE ELECTRIC SHOCK OR DAMAGE TO THE
COMPONENTS CARE MUST BE TAKEN WHEN MAKING
ADJUSTMENTS WITHIN THE AMPLIFIER BOX. WHEN POWER IS
SUPPLIED TO THE AMPLIFIER, TOUCH ONLY THE SCREW HEADS
OF THE TRIM POTS.
Factory Pre-settings
The following are the factory pre-settings on the trim pots:
• ROI GAIN set at 10 turns clockwise (CW) from CCW maximum.
• RAI GAIN set at 10 turns CW from CCW maximum.
• DEADBAND set at CCW maximum.
• FDBK GAIN set at 6 turns CCW from CW maximum.
• GAIN set at 10 turns CCW from CW maximum.
• SPEED set at CW maximum.
• BAL. set at 10 turns CW from CCW maximum.
• BAL. JUMPER set in the null (no effect) position
NOTE: These trim pot positions should be used before proceeding with amplifier
calibration. Multi-turn trim pots do not have hard stops at the end of their
25 turns of travel. They do, however, emit a "clicking" noise when the end
of screw travel is reached.
WARNING: DO NOT LET THE STEERING GEAR GO ALL THE WAY HARD
OVER TO ITS MECHANICAL STOPS. READ THE FOLLOWING
INSTRUCTIONS BEFORE ATTEMPTING ADJUSTMENTS.
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