HP 220 - Manual (Page 151)

Access
Cartridges
8Ć3 Troubleshooting C3187Ć90000
Extended PowerĆOn Self Test
Perform the extended powerĆon test whenever the plotter passes the normal powerĆon test,
but does not function properly.
To begin the extended powerĆon test, perform the following procedure:
, Switch theplotter off.
. Whileholding the
Access Cartridges
key down,
switch theplotter on.
A Oncethe
Busy
LED lights up, release the
Access Cartridges
key.
As well as carrying out the normal powerĆon tests, the extended powerĆon test does the
following:
, Tests the processorĆsupportĆASIC motion control circuitry. (These circuits control the
media and carriage motors.)
. Tests the swath RAM.
A Tests the communication link between the cartridgeĆinterface ASIC and the carriage
ASIC.
4 Tests the available DRAM not being used by the system. (The length of this test is
dependent on how much DRAM is installed.)
5 Begins mechanical initialization of the plotter.
Mechanical Initialization
The automatic mechanical initialization of the plotter begins at the end of the powerĆon test.
Theinitialization proceduredoes thefollowing:
, Checks the window sensor.
. Locates the initial position of the stepper motor.
A Initializes thecarriageaxis (YĆaxis).
4 Ejects any loaded sheet of media.
5 Checks the pinchĆarm sensor.
6 Checks the media sensor.
7 Sets the plotter to accept media.
8 Tests the remainder of the DRAM.