Raytheon ST60, Service Manual

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Part 1. ST60 Instruments – Chapter 1. Speed
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ST60 Instruments Service Manual 83142-1 1
Chapter 1. ST60 Speed instrument
Disassembly/reassembly
On reassembly (refer to Figure 1), it is important that the PCB assembly module is
fixed to the facia (3) using a torque of 0.22Nm (2lb in). Similarly, fixing the rear case
(11) to the facia (3) must also be torqued to 0.22Nm (2lb in).
Note: Failure to practice using the recommended torques may result in damage to
the facia inserts. It is also recommended a new case seal (10) is fitted on reassembly.
Self-test procedure
The ST60 Speed instrument has built-in self-test functions to aid fault diagnosis.
To access self-test mode, press Key 1 and Key 4 together for 4 seconds. When the
unit beeps, immediately press Key 3 and Key 4 together momentarily. The unit will
enter self-test stage 1.
Self test stage 1
A. The unit should display “TEST1”
B. Audible Beep for 1 second.
C. There will be a SeaTalk transmission to check the transmit/receive circuits.
D. The EEPROM is tested.
The following failure codes may be generated:
Message Failure Mode Action
FAIL 1 SeaTalk Rx/Tx Check for damaged bucket connectors/rear-case pins.
Check SeaTalk interface components around TR1, TR2and TR3.
FAIL 2 EEPROM failure Replace EEPROM (IC2)
If there is no audible beep, check TR11 and RN3 and the buzzer for damage. If the
beep is quiet, check R21.
If all test pass, “PASS” is shown on the display. Press Key 1 and Key 2 together
momentarily to progress to self-test stage 2.
Self-test stage 2
A. The unit should display “TEST 2” for 1 second.
B. Illumination will change between level 0 and level 3 every second.
C. Any key press sound cause audible beep.
D. LCD segments will cycle through the following sequence:
D4479-1
1 2 3 4