User manual

98.05.08.09.00
Color LaserWriter 12/600 PS Troubleshooting 2–13
Extended
POST
(EPOST)
Some error conditions that stop printer operation cannot be detected
within the short period of time that POST runs. When this occurs, the
status panel flashes all four primary lights.
To identify the specific error condition that is causing the “all flashing”
array, you must restart the printer under Extended POST (EPOST).
This mode simply extends the amount of time given to the testing, so
that all errors are detectable. It also reports on jams and consumables.
See “EPOST Codes Matrix” later in this topic.
Whereas POST messages can be relayed to you by the customer over
the phone, EPOST requires that you be at the printer.
Initiating
EPOST
To initiate EPOST, you must have the printer loopback test plug (P/N
922-1489). This test plug is colored bright green to differentiate it from
the older version black plug. Do not use the black plug on the Color
LaserWriter 12/600 PS. It won’t harm anything; it just won’t work.
Note : In order to perform EPOST, the I/O board configuration switch
must be in the custom configuration position (to the right). If the switch
is to the left, EPOST will not work.
Switch off the printer and install the test plug into the LocalTalk port on
the back of the I/O controller board. Switch the printer on. The printer
will now behave normally, except that the startup sequence will last
longer. In addition, if no error is detected by Extended POST, an
EPOST test page will print before control is passed on to the PostScript
interpreter.
Note : Remember to remove the loopback plug after running EPOST.
POST/Undetected Error
EPOST
Test Page