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.
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 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.