Raymarine ST40, Service Manual

Page: 43 / 70

Chapter 4, ST40 Wind Instrument
ST40 Instruments Service Manual 83149-2 2-31
E22041
Self-test stage 3
Note : A known good Rotavecta transducer must be connected, for this test.
When entering self test stage 3, the instrument beeps and the display shows
TEST3
,
for 1 second.
A transducer test then starts. Within the next 15 seconds, manually spin the
Rotavecta cups, so they rotate at approximately 20 rpm, or faster.
If the instrument detects a sufficient number of Rotavecta pulses,
PASS
is shown on
the display.
If the test fails,
FAIL 36
is displayed. Use the following table to try to isolate the cause.
Check Failure mode Action
Rotate Rotavecta cups and Voltage not switching Check constant current at P2 is approx 10 mA
check that the voltage at P2 Check that P1 is at 0 V
switches between approx 3 V Check L7 is not open circuit.
and 8 V
Check Rotavecta pulses at No pulses Check IC4 and associated
IC4, pin1 components
Check ROTAPRESS at ROTAPRESS low Check IC4 and associated
IC4, pin 2 is high. components.
Press the and keys together momentarily to exit self-test.