During start-up, a stand-alone Esc Esc D test, and during an ACABA subject test, the instrument may stop, set off an alarm, and report (or not report) a problem with one of the 9 issues: Diagnostics Voltage/Current Test, Diagnostics RAM Test, Diagnostics EEPROM Test, Diagnostics RTClock Test, Diagnostics DSP Test, Diagnostics Analytical Test, Diagnostics Int Prnt Test, Diagnostics Modem Test, Diagnostics Temp Reg Test.