Toshiba 70CT User Guide - Page 46

2 Troubleshooting Procedures 2.4 System Board Troubleshooting NOTE: If an error condition is detected by the IRT test, the printer port LED displays an error code after the IRT test ends. For example, when the printer port LED displays 1F and halts, the IRT test has already completed the Display initialization. In this instance, the IRT indicates an error has been detected during the system memory test. Table 2-3 Printer port LED boot mode status (1/2) LED status 00H 02H 03H 04H 05H 06H 07H 08H 0AH 0BH 0CH 0DH 18H 1FH 25H 30H 40H 41H Test item KBC initialization ROM Check PIT test PIT initialization PIT function check CMOS check KB initialization Initialization of memory configuration SM-RAM check ROM/RAM copy Selftest skip check Read PS Information Initialization of internal VGA First 64 KB memory test System memory clear System clear Interrupt vector initialization PIC initialization Display initialization System memory test Extended memory test DMA page register test DMAC test Message - - PIT ERROR - MEMORY REFRESH ERROR TIMER CH.2 OUT ERROR CMOS CHECKSUM ERROR CMOS BAD BATTERY ERROR - - - - - - FIRST 64KB MEMORY ERROR FIRST 64KB MEMORY PARITY ERROR - - - - VRAM ERROR SYSTEM MEMORY ERROR SYSTEM MEMORY PARITY ERROR EXTENDED MEMORY ERROR EXTENDED MEMORY PARITY ERROR DMA PAGE REGISTER ERROR DMAC #X ERROR Libretto 50CT/70CT Maintenance Manual 2-13