HP 250C - Manual (Page 187)

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250C
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8Ć53 Troubleshooting C4699Ć90000
Servo/Encoder Test
The servo/encoder test performs the following:
D MediaĆaxis encoder test: Verifies the operation of the servo loop (mediaĆaxis feedback).
D CarriageĆaxis encoder test: Verifies the operation of the servo loop (carriageĆaxis
feedback).
D Records the maximum pulseĆwidth modulations used. You can view this information on
the service configuration plot.
1 In service mode 2:
Hold down the
ALT
key and press
Servo/Encoder Test
.
Press
Servo/Encoder Test
.
The
Load Media
LED (or the
Ready
LED, if you have already
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 frontĆpanel key to stop the test.
Status. If the test does not find an error, the
Load Media
LED (or the
Ready
LED, if
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 (Y-Axis = Carriage Axis.) This should be less
than 102. Typical value = 75.
Encoder Tests, Maximum X-Axis PWM (X-Axis = Media Axis.) This should be less than
65. Typical value = 52.
Servo/Encoder
Test
ALT
Servo/Encoder
Test