User's Manual Part 3

Chapter 6 — Troubleshooting
6822 Series 80-Column Printer User’s Manual 107
A self-test is equivalent to a warm start. Both are performed when you
simultaneously press Form Feed and Set Page buttons on the control
panel for a few seconds. Release the buttons when the printer beeps and
all indicators are lit. If you press the buttons for too long, the self-test
will not happen and the printer will form-feed one page.
As the self-test progresses, the indicator lights change. Internal tests are
performed and the two page report is printed. This report provides
helpful information in diagnosing and troubleshooting printer problems.
When you perform a self-test, the following actions occur:
• All LEDs are turned on to verify the lights work
• A 600 ms beep is emitted to verify the beeper works
• LEDs flash individually to show progress during internal tests
• Current voltage and ambient temperature are obtained
• Validity of diagnostic block program is checked
• Validity of boot block program is checked
• Validity of control program is checked
• Validity of loaded fonts is checked
• LEDs turn off
• Self-test report is printed
Printer capability is diagnosed by printing the report. Device errors are
displayed on the LEDs and emitted by the beeper. The printer then does
a warm reset (soft reboot) when an error is encountered or when the self-
test report prints.
Understanding the Self-Test Report
The self-test report is divided into sections. Refer to page 110 and
page 111 for a sample printout. All other values are informational only.
Remember that these values are cleared after the self-test.
• The printer model number is given on line 1 (first line). This identifies
the printer type used, in this case the 6822.
• The 8-digit serial number of the printer is listed on line 4 under the
“Serial#” heading on line 3. The serial number is also on the inside of
the printer. In portable printers, raise the printer mechanism to look for
the number on the inside back wall.