Chapter 5, ST40 Compass Instrument
ST40 Instruments Service Manual 83149-2
2-39
E22042
Self-test stage 3
Note
:
A known good Fluxgate Compass transducer must be connected, for this test.
When entering self test stage 3, the instrument beeps and the display shows
TEST3
,
for 1 second.
If the instrument detects valid compass readings in all four heading quadrants within
15 seconds of the start of test stage 3 and if the compass transducer interface is
satisfactory,
PASS
is shown on the display.
If the test fails,
FAIL29
is displayed. Use the following table to try to isolate the cause.
Check
Failure mode
Action
VREF voltage at P11
Not 2.5 V
Ensure L17 is not open circuit.
Check VRESET is 2.5 V
SCREEN voltage at P9
Not 0 V
Ensure L10 is not open circuit
FGDRIVE repetitive
No pulses
Ensure L16 is not open circuit.
pulse train at P7.
Check that pulse train is present both sides of C39.
Check drive circuit components around TR16 & TR17.
If you have not isolated the fault after using the above table:
• Ensure L18, L19 are not open circuit.
• Check ADC circuit components, i.e. IC8, IC9 and associated components.
Press the
and
keys together momentarily to exit self-test.
Summary of Contents for ST40
Page 2: ...Copyright RaymarineLimited2004...
Page 4: ......
Page 58: ...Part2InstrumentServicing 2 46 ST40 Instruments Service Manual 83149 2 E22042...
Page 60: ...Part3 TransducerServicing ST40 Instruments Service Manual 83149 2...
Page 64: ...Part3 TransducerServicing 3 4 ST40InstrumentsServiceManual 83149 2 Speed Transducer...
Page 70: ...Part3 TransducerServicing 3 10 ST40InstrumentsServiceManual 83149 2 Rotavecta Wind Transducer...
