Troubleshooting:
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Ockam bus
Display
Functional
Configuration
Errors
T1 Status

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Power Troubleshooting

The Ockam system runs on ship’s power which typically must pass through 3 switches, two fuses, a voltage regulator, a power limiting circuit and the Ockam Bus before it gets to the display itself. In order to troubleshoot the system power, look at the various power indicators along the path from the ship’s battery to the display.


The first place you might be able to verify ship’s power is at the power panel. Most have a battery voltage display of some kind. If there is no indication here, the main battery switch or the battery itself is suspect.
001 Processor
The trouble light, located between the two switches on the side of the CPU, provides the next convenient indicator. This light is illuminated by three things; voltage supply greater than 4 volts and less than 10.5 volts, current of more than 3 amperes going to the Ockam Bus, and the existance of TEST Error codes which cause it to flash beginning 2 seconds after power up.

When the CPU is first turned on (both instrument breaker and CPU power switch on), the trouble light should flash as the supply voltage rises above 4 volts, then go out when it rises above 10.5 volts. After two seconds, if there are any TEST Errors, the light will start flashing (see Error Codes).
  • If the trouble light stays on, it indicates either low supply voltage or high Ockam Bus current, either of which will prevent the displays from working. However, it does indicate that power is getting to the CPU.
  • To determine which of the above possibilities exist, disconnect the Ockam Bus at the BNC connector on the back side of the CPU. This eliminates the possibility of high current. If the light stays on, then the ship’s supply is too low to run the system. If the light goes out, then the Ockam Bus is shorted. See Bus Troubleshooting.
  • If the trouble light stays dark as you turn the CPU on, it means that no power is reaching the CPU. Either the instrument circuit breaker, power cable, CPU fuse or CPU power switch is open.
  • If the trouble light flashes and goes out, then power at the CPU is normal, and the Ockam Bus is not shorted (it could be open however; see Bus Troubleshooting).
If the trouble light reacts properly but nothing happens at the displays, then the probability is that the Ockam Bus is open or disconnected (see Bus Troubleshooting), or that all the display fuses are blown, which can happen after a lightning strike. If the latter, then you should contact Ockam or an Ockam dealer for help.
T1 Processor
If any of the indicator lights are lit, it means that internal 5 volt power is being generated. There is no indication of bus short on the T1.