Servo/Encoder Test - HP DesignJet 250C Service Manual

230

Servo/Encoder Test

250C
The servo/encoder test performs the following:
D Media axis encoder test: Verifies the operation of the servo loop (media axis feedback).
D Carriage axis encoder test: Verifies the operation of the servo loop (carriage axis
feedback).
D Records the maximum pulse width modulations used. You can view this information on
the service configuration plot.
1 In service mode 2:
230
Hold down the
ALT
250C
330
Press
Servo/Encoder Test
350C
The LED (or the
Load Media
loaded media) turns off, and the carriage moves over the left
end of the roller. The roller rotates slightly.
The carriage moves to the center of the plotter. Both the carriage
and the roller then move backwards and forwards in cycles of six short steps,
changing direction between cycles.
2 Press any front panel key to stop the test.
Status. If the test does not find an error, the
you have already loaded media) turns on again. If the test finds an error, it is
indicated by an error code on the front panel.
Stored in EEROM (and printed on the service configuration plot ' page NO TAG)
Encoder Tests, Maximum Y-Axis PWM
Encoder Tests, Maximum X-Axis PWM
C4699 90000
key and press
Servo/Encoder Test
.
LED, if you have already
Ready
.
Servo/Encoder
Test
Servo/Encoder
Test
LED (or the
Load Media Ready
(Y-Axis = Carriage Axis.) This should be less
than 102. Typical value = 75.
(X-Axis = Media Axis.) This should be less than
65. Typical value = 52.
Troubleshooting
ALT
LED, if
8 53