Toshiba Libretto 50CT, User Manual

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2 Troubleshooting Procedures 2.4 System Board Troubleshooting
Libretto 50CT/70CT Maintenance Manual 2-13
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 Test item Message
00H KBC initialization —
ROM Check —
02H PIT test PIT ERROR
PIT initialization —
PIT function check MEMORY REFRESH ERROR
TIMER CH.2 OUT ERROR
03H CMOS check
KB initialization
CMOS CHECKSUM ERROR
CMOS BAD BATTERY ERROR
—
04H Initialization of memory
configuration —
05H SM-RAM check —
06H ROM/RAM copy —
07H Selftest skip check —
Read PS Information —
08H Initialization of internal
VGA
0AH First 64 KB memory test FIRST 64KB MEMORY ERROR
FIRST 64KB MEMORY PARITY ERROR
0BH System memory clear —
0CH System clear —
0DH Interrupt vector
initialization —
18H PIC initialization —
1FH Display initialization VRAM ERROR
25H System memory test SYSTEM MEMORY ERROR
SYSTEM MEMORY PARITY ERROR
30H Extended memory test EXTENDED MEMORY ERROR
EXTENDED MEMORY PARITY ERROR
40H DMA page register test DMA PAGE REGISTER ERROR
41H DMAC test DMAC #X ERROR