DataMetrics 4080B, Operation And Maintenance Instructions, Page: 33 / 85

OPERATION AND MAINTENANCE
DataMetrics Corporation 22
3. Power supply voltage status signals are sampled against stored values for faults and
voltage to the drive motor. This occurs for approximately 5 seconds to allow a motor
run status signal check. A failure causes the FAULT indicator to illuminate and printer
to remain off line.
(a) At completion of power-on BIT with no faults detected, printer sends ACK code
notifying host that printer is ready and illuminates ON LINE indicator.
(b) If BIT fails, the FAULT indicator will illuminate, an NAK code and status byte is
sent to the host, and the printer will remain off line waiting. Troubleshoot by
referring to chapter 6.
b.
Operator-Invoked Self-Test Diagnostic. A self test invoked by the operator pressing TEST
switch-light performs the following tests of the printer:
NOTE
The operator-invoked self-test diagnostics also can be initiated by the host
sending a DC2 control code to the printer.
1. Printer sends off-line signal to host and extinguishes ON LINE indicator.
2.
Performs a lamp test of each indicator and switch-light, twice in a clockwise direction
from POWER, ending with POWER indicator illuminated.
3.
Advances paper several lines.
4.
Performs power-on BIT.
5.
Prints a shifting pattern of host selected 40- or 80-column alphanumeric text (Figures
4-6 or 4-7).
6.
Advances paper several lines.
7.
Sends ACK code notifying host that printer is ready.
8.
Illuminates ON LINE indicator.
9. Compare printout from step 5. to Figures 4-6 or 4-7. If not similar to or better than
self-test pattern, refer to troubleshooting (Chapter 6).
(a) At completion of power-on BIT with no faults detected, printer sends ACK code
notifying host that printer is ready and illuminates ON LINE indicator.
(b) If BIT fails, the FAULT indicator will illuminate, an NAK code and status byte is
sent to the host, and the printer will remain off line waiting troubleshooting
(Chapter 6).