Chapter 2: St40 Depth Instrument; Input/Output Signals; Self-Test Procedure; Self Test Stage 1 - Raymarine ST40 Service Manual

Chapter 2, ST40 Depth Instrument
Chapter 2:

Input/output signals

Self-test procedure

ST40 Instruments Service Manual 83149-2
ST40 Depth 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
DEPTH- Intermittent pulses at 200 kHz, approximately 400 µs wide, 300 V peak-to-peak
DEPTH+ Intermittent pulses at 200 kHz, approximately 400 µs wide, 300 V peak-to-peak
DEPTH_0V 0 V
Refer also to the ST40 Depth circuit diagram.
Each ST40 instrument has built-in self-test functions to aid fault diagnosis.
To self-test an ST40 Depth 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:
• SeaTalk self test, which checks the receive and transmit circuits.
• EEPROM test (read and write).
If the tests are satisfactory, PASS is shown on the display.
Raymarine
Limited
and keys together momentarily, to start
DEPTH- (Black)
DEPTH+ (Blue)
DEPTH_0V (Screen)
D4805-2
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