LEVEL 1 DIAGNOSTICS ERROR RETURNSADDR: ssss: oooo, EXP DATA: xxxx, OBS DATA: yyyyWhere, ww = Detail codessss = Segment address of error0000 = Offset address of errorxxxx = Expected datayyyy = Observed dataDetail codes:01 Monochrome pattern error02 Monochrome address error11 Color pattern error12 Color address errorRepair Procedure 09Refer to Repair Procedure 08. Use the m e m o r yexpansion board to test the CRT controller card datapath. If the memory expansion board produces a RAMf a i l u r e error, the h a r d w a r e data path to theexpansion slot is suspected to have failed. Otherwisesuspect a defective RAM IC on the CRT controllercard.DETAIL CODE 01 and 11These codes refer to the monochrome and colorunits, respectively. T h e y i n d i c a t e anintermittent failure of a line driver to theRAM IC or a stuck data bit within the RAM. Ifthe flexible disk drive controller or thememory expander card (if installed) do notproduce an error in the diagnostics test theCRT RAM IC is most likely the cause of theerror condition.DETAIL CODE 02 and 12Suspect intermittent failure of an addresslatch. Check the address bus to the mai nProcessor Board expansion slot for properoperation (particular attention should be givento address lines 18 and 19). The failure isprobably the result of a defective component onthe CRT controller card.5-57
