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4-18 Troubleshooting
NovaJet 500/630/700 Series Service Manual
Initialization Troubleshooting (500 Series)
The sequence that the printer follows during initialization (power up) is
as follows:
1. Power supply turns on - LED D2 on carriage turns on.
2. Reads the Flash ROM information.
3. Performs memory test with installed SIMMs.
4. Writes the Flash ROM data into RAM for quicker execution of the
code. Starts executing instructions from RAM.
5. Loads MPCB gate array with boot code data.
6. Checks for a valid ROM. If the ROM is not valid, waits for a ROM
image to be downloaded.
7. Steps 2 - 4 performed again.
8. Loads MPCB gate array with ROM code data.
9. Loads gate array on the carriage board. LED D2 goes out as soon
as the carriage board gate array is programmed.
10. Turns on power supply cooling fan.
11. Moves carriage.
12. Checks and measures media size if loaded.
13. Turn on display.
To troubleshoot using the D2 LED:
With the power off, move the carriage away from the service
station and snap the carriage cover off just enough to view the LED
located in Figure 4-1.
Turn on the unit. After a short delay, the LED D2 will light.
Ensure that the LED extinguishes after about 3-4 seconds.
Turn the unit off immediately after the LED extinguishes to
ensure no damage occurs to the carriage or carriage cover due to the
carriage movement as stated in step 11.
Snap the cover back onto the carriage.