ENCAD T-200, Руководство по обслуживанию

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Troubleshooting 4-16
CadJet T-200 Service Manual
Initialization Troubleshooting
The sequence that the printer follows during initialization (power up) is
as follows:
1. Power supply turns on - LED D2 on carriage turns on then D5
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 MPWA 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 MPWA 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 and D5 LEDs:
With the power off, move the carriage away from the service
station and snap the carriage cover off just enough to view the LEDs
located in Figure 4-1.
Turn on the unit. After a short delay, the LED D2 will light.
This will be followed by D5 turning on (D5 will illuminate dimly).
After about 3-4 seconds LED D2 will extinguish. Ensure that
the LED extinguishes after about 3-4 seconds. Approximately 4 seconds
later LED D5 will illuminate brightly momentarily and then return to
the dimly lit status.
The fan will turn on and the carriage assembly will begin to
move.