NCR PC4i Service Manual

Also see for PC4I: Technical reference Service manual Owner's manual

Contents

NCR PC4i Service Manual Manual pdf 151 page image

LEVEL 1 DIAGNOSTICS ERROR RETURNSyy = Observed data from registerDETAIL code:01 Monochrome crtc register access error02 Monochrome crtc cursor error03 Monochrome crtc character set error04 Monochrome crtc attribute error06 Monochrome crtc scroll error11 Color crtc register access error12 Color crtc cursor error13 Color crtc 80x25 character set error14 Color crtc attribute error15 Color 640x25 mode error16 Color crtc scroll error20 Color 320x200 graphics error - color set 021 Color 320x200 graphics error - color set 122 Color 640x300 graphics error30 Color light pen test aborted (timeout)31 Color light pen address failureRepair Procedure 08Detail codes 01 through 06 refer to the errors thatoccur on systems that use a monochrome display.Detail codes 11 through 22 are associated withsystems that use a color video display.If you have another video display controller card,try to install it. Should this not solve the problem,remove the controller card from its expansion slotlocation and re-install it in another expansion slotlocation. This will correct a problem that is theresult of a bad expansion slot connector. If thevideo display is operational and will perform somefunctions (such as inverting the display) then thecharacter generator ROM on the controller card isprobably defective. Errors that are reported for themonochrome/color video display are usually the resultof a bad controller card. To check the possibility ofa bad data path to the controller card from the MainProcessor Board, a memory expander card can be placedinto the e x p a n s i o n slot occupied by the videocontroller card and the diagnostics test for RAMfailures can be executed. To use this technique a BCDdisplay must be installed for error message output,or output should be redirected to a printer.5-35