2.2 The IBM 7171 ASCII Device Attachment Control Unit - Index of

Symptom IndexLocate symptom in the following list; then go to the symptom code indicated to theright. The symptom codes follow the Symptom Index within this chapter. If thesymptom is not found in the list, or, it can't be resolved through the procedure,then contact IBM for assistance. (Reference 8.1.1, "Assistance for ProblemDetermination. ")Front End (TCC / CPU) related symptoms.Unexpected or intermittent line drop (line disconnect) ......... F-1Garbled data at terminal screen ................................ F-2Double characters 'Echoed' to the screen ....................... F-2Autobaud related problems ...................................... F-3Port doesn't restart automatically ............................. F-4No data sent to terminal screen. (Enter Terminal Type:) ........ F-5Specific range of ports can't present data to attached devices.F-6Screen problems appear after entering the valid terminal type .. F-7Modem Related problems. (strapping/configuring) ................ F-8Printer overruns on data from host ............................. F-9Power Indicator does not turn on at Front Panel ............... F-10Diagnostic failure at power-up. (red light(s) No Ready Light) .F-11Intermittent Power or Diagnostic failures ..................... F-12IIIII IIChannel End (CA/CCC/CPU) related symptoms.Can't VARY ONLINE or ENABLE device ............................. C-1Cursor to bottom right afterENTER TERMINAL TyPE ............................................ C-2Interface Control ChecksGOT STATUS OF WRONG DEVICEWHEN CHANNEL EXPECTED STATUSFROM ANOTHER DEVICE ........................................ C-37171 locks up on first readyingterminal with first write command .............................. C-4READY drops when 7171 switched online .......................... C-5Operational checks for a 7171 device ........................... C-68-2 IBM 7171 Reference Manual and Programming Guide