TM 11-5895-1412-12&PBecause this includes RAM tests, information on the Edisc (drive A) will belost.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 displaymemory.A variety of patterns are displayed on the screen while the LCD testis running.Timer test (f3)This test checks the operation of the internal timers and thebuilt-in-time-of-day clock.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 theloop is broken, and if it is not broken; displays the number of devices on theloop.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 thecomputer failed the test.The broken loop message indicates that the loop is not continuous or that oneof the devices on the loop is not turned on.To find out where the problemis, do the following:lllIf no HP-IL peripherals are connected, refer to fourth step below.Verify that all devices on the loop are connected properly and turnedon.(Refer to Section II page 2-6 for connecting Printers, DiscDrives, and Other Peripheral Devices, if you have questions abouthooking up HP-IL peripherals.) Then run the test again.If the message still appears, remove one device from the loop and tryagain.Repeat step 2 until the bad device or cable is found, or until alldevices have been removed from the loop.If you still get the Broken loop message, connect a cable from theHP-IL OUT connector on the Portable PLUS to the IN connector. Thentry the test again.If the message still appears, connect a different cable and try thetest once more.If the message appears again, the problem is internal to the computerand it requires repair.3-5
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