Chapter 5: St40 Compass Instrument; Input/Output Signals; Self-Test Procedure; Self Test Stage 1 - Raymarine ST40 Service Manual

Chapter 5, ST40 Compass Instrument
Chapter 5:

Input/output signals

Self-test procedure

ST40 Instruments Service Manual 83149-2
ST40 Compass Instrument
STALK (Yellow)
BATT- (Screen)
BATT+ (Red)
Connections to instrument
Signal Description
STALK Intermittent streams of (nominal) 12 V pulses
BATT- 0 V
BATT+ Nominal 12 V dc supply
VREF Fluxgate 2.5 V
FGB Sense B
SCREEN Fluxgate 0 V return
FGA Sense A
FGDRIVE Fluxgate drive
Refer also to the ST40 Compass circuit diagram.
Each ST40 instrument has built-in self-test functions to aid fault diagnosis.
To self-test an ST40 Compass instrument:
• Press the and keys simultaneously for 4 seconds, to access self-test mode,
then within 2 seconds, press the
self-test stage 1.

Self test stage 1

When entering self test stage 1, the instrument beeps and the display shows TEST 1,
for 1 second. The following tests are then performed automatically:
Raymarine
Limited
SCREEN (White)
FGDRIVE (Blue)
and keys together momentarily, to start
VREF (Red)
FGB (Green)
FGA (Yellow)
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