HP C2858A Service Manual page 140

Test
Parallel I/O
MIO
Y-friction
Pen nozzle
Pen ID
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Table 8-3. Service Tests (Continued)
Description
The data and status registers of the Centronics
PAL are read. A successful test completes
very quickly (<1 s). "PASS TEST PRESS
ENTER" will be indicated. If the test fails, the
system will hang up. A system error error
code will NOT be displayed, and power to the
plotter must be recycled. This tests only a
small portion of the Centronics I/O
functionality. To EXIT, press ENTER button.
The MIO is tested during power-on. This test
checks to see if the MIO is present and reads
the results of the power-on test. An "MIO
PRESENT PRESS ENTER" display indicates
a successfull test result. EXIT by pressing the
ENTER button.
The pen carriage is moved along the slider
rods with and without the cutter assembly. A
range of PWM signals required to move the
carriage is measured and displayed for both
cases (with and without the cutter) This test is
used to check for excessive friction in the
Y-axis Excessive friction could cause poor
print quality or servo shutdowns. EXIT by
pressing the ENTER button.
Drops are fired past the drop sensors of the
print cartridges. A "PASS TEST PRESS
ENTER" display indicates that all nozzles are
functioning correctly. A failure, including
failed pen identity, is displayed on the front
panel. The failed pen should be reinserted and
retested. If a failure is still indicated, wipe the
pen interconnect surfaces and retest. EXIT by
pressing the ENTER button.
Displays each pen ID code and resistance
value. Used by plotter to set pen warm-up
sequences and nozzle firing energy.
Assemblies
Tested
Main PCA
MIO PCA
Interconnect
PCA
Main PCA
Pen Carriage
Cutter Bushings
Main Idler
Double Pulley
Main Belt
Drive Belt
Slider Rods
All Pens
Pen–Pen
Carriage
Interface
Pen CArriage
Trailing Cable
Main PCA
Interconnect
PCA
All Pens
Troubleshooting
8-15