Because this includes RAM tests, information on the Edisc (drive A) will be
Refer to the preceding caution near the beginning of sub-paragraph 2.
LCD test (f2)
This test checks the LCD display controller registers and the LCD display
A variety of patterns are displayed on the screen while the LCD test
Timer test (f3)
This test checks the operation of the internal timers and the
RS-232 test (f4)
This test checks the Internal registers of the RS-232 interface.
HP-IL test (f5)
This test checks the operation of the HP-IL controller, determines whether the
loop is broken, and if it is not broken; displays the number of devices on the
All HP-IL peripherals must be turned on for this test to work.
The bad device message indicates that the HP-IL controller chip in the
computer failed the test.
The broken loop message indicates that the loop is not continuous or that one
of the devices on the loop is not turned on.
To find out where the problem
is, do the following:
If no HP-IL peripherals are connected, refer to fourth step below.
Verify that all devices on the loop are connected properly and turned
(Refer to Section II page 2-6 for connecting Printers, Disc
Drives, and Other Peripheral Devices, if you have questions about
hooking up HP-IL peripherals.) Then run the test again.
If the message still appears, remove one device from the loop and try
Repeat step 2 until the bad device or cable is found, or until all
devices have been removed from the loop.
If you still get the Broken loop message, connect a cable from the
HP-IL OUT connector on the Portable PLUS to the IN connector. Then
try the test again.
If the message still appears, connect a different cable and try the
test once more.
If the message appears again, the problem is internal to the computer
and it requires repair.