NCR 7800 - Power-Up Diagnostics

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LED flash sequences repeat every 3 seconds. Tone
sequences repeat twice.
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Off Off No power.
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On Off ASIC write/read failure
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Off On "Laser E4" Laser may be on when it
should be off.
Remove
p
ower immediately.
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On 1 beep Bad EPROM
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2 flashes 2 beeps RAM write/read failure
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4 flashes 4 beeps "Laser E4" Laser off but should be on.
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5 flashes 5 beeps "DC Motor E5" Wrong laser motor speed
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6 flashes 6 beeps "EEPROM E6" EEPROM cannot write to
memory.
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7 flashes 7 beeps "Stepper Motor
E7"
Mirror or stepper motor not
running.
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8 flashes 8 beeps Display not working
correctly.
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Power-up Diagnostics
Note: