Tektronix Phaser 550 Service Manual page 189

9
Checks and Adjustments
Normal power-up self-tests. This test requires no paper or customer interaction. If
a problem is encountered with the image processor's expansion memory or other
options, then the information is printed on the printer's startup page. Normal
power-up tests take slightly longer than one minute to complete.
The health LED, located on the image processor board, flashing in a regular, one
flash-per-second rate means no errors were detected and the image processor's
CPU is running.
Kernel tests. The printer's image processor executes its core set of CPU tests and
then, if no error occurs, goes directly to PostScript initialization.
Verification test.
This test requires no paper or customer interaction. Disconnect
all host cables from the printer before starting the test. A fully configured printer
takes slightly longer than 3 minutes to execute the tests. The image processor
continuously executes a series of tests of its CPU kernel, RAM and other image
processor components. The series of tests run continuously until an error occurs.
The printer continuously loops on that test indicating the number of times the
test passed and failed. The printer must be turned off to exit the test series.
Service tests.
Service tests include all the available image processor self-tests
with the addition of some test prints and also being able to interact with the
print engine motors, solenoids and sensors. You select and start tests using the
front panel. The message Service Tests is displayed on the top line of the
front panel when the service test mode is activated. If no error is detected, the
front panel displays the first test. Using the front panel buttons, scroll to an
individual test and run it. You can run any test in any order you wish. In service
mode, you can also scroll to a set of tests that allow you to start a single print or
to print continuously. The tests are described in Table 9-1, "Print engine service
test descriptions," on page 9-8.
Service Manual 9-7