Self Test Stage 1; Self-Test Stage 2 - Raymarine ST40 Service Manual

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.
If the tests are not satisfactory, the following failure codes may be generated:
Message
FAIL 8
FAIL 18
If there is no audible beep, check TR19(b) and RN3 and the buzzer for damage. If the
beep volume is low, check R93.
Press the

Self-test stage 2

When entering self test stage 2, the instrument beeps and the display shows TEST 2,
for 1 second. The following tests are then performed automatically:
• The display backlighting cycles between on and off every second.
• A display test is performed. The LCD segments are displayed in the following
While this test is progressing, press each of the front panel keys and check that the
buzzer sounds as each key is pressed.
If any problems occur, use the following table as a guide to try to remedy the
problem:
Failure
No illumination
No beep when key pressed
LCD segment(s) missing completely
Faint LCD segments
2-2
Failure
SeaTalk Rx/Tx
EEPROM
and keys together momentarily, to proceed to self-test stage 2.
sequence, changing once per second:
Part 2 Instrument Servicing
Action
Check SeaTalk interface components around TR5
Replace EEPROM (IC3)
CAL
Action
Check TR18 and associated components.
Check all LEDs.
Replace keyswitch.
Check LCD pins for poor/dry joints.
Check IC7 pins for poor/dry joints.
Check LCD for short circuited pins.
Check IC7 for short circuited pins.
Check the contrast drive circuit around TR6.
ST40 Instruments Service Manual 83149-2
D4887-1