HP DesignJet 250C Service Manual page 173

230
Carriage Test for the DesignJet 230 and 250C
250C
This tests the operation of the carriage sensor and the connection between the carriage flex
circuit and the cartridges.
1 Position the sensor over a white surface. (Simply place a piece of
white paper under the sensor.)
2 In service mode 1, press
The plotter varies the LED intensity between 255 and 0.
The plotter tests the connection between the carriage flex circuit
and the cartridges by getting the cartridge identification and
checking the electrical continuity for all nozzles.
Status. During the test, the
carriage test has not found an error. If the test fails, one or both of these LEDs flash as
indicated below:
Both OK
Output to the Serial Port (Viewing Output ' 8-36)
Error code:
Sensor sensitivity:
Pen ID:
3 The test continuously repeats itself until you
press the key.
Shift
C4699 90000
.
Carriage Test
and LEDs turn on (steady) if the
Cartridges Error
Sensor Failed
Connection Failed
If an error has occurred in the sensor test, this code specifies more
precisely what has gone wrong. Include this information in the
report to your HP Response Center, if the problem cannot be fixed.
Pen 0 = Cyan; Pen 1 = Magenta; Pen 2 = Yellow; Pen 3 = Black.
The sensitivity measured during the test. The figures should vary
from 255 to 0. Failure occurs when the sensitivity does not vary
(for example, it stays at 255).
If a pen does not fail, the plotter outputs the pen ID.
Carriage
Test
Flex-Circuit
Both Failed
Troubleshooting
Shift
8 39