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2 Troubleshooting Procedures
2-18 [CONFIDENTIAL] PORTEGE M700/M750 Maintenance Manual (960-661)
Check 2 The IRT checks the system board. When the IRT detects an error, the system
stops or an error message appears.
If one of the following error messages (1) through (17), (22) or (23) appears, go to
Procedure 4.
If the error message (18) appears, go to the Keyboard Troubleshooting Procedures
in Section 2.7.
If the error message (19), (20) or (21) appears, go to the HDD Troubleshooting
Procedures in Section 2.6.
If the error message (21) appears, go to the Optical Drive Troubleshooting
Procedures in Section 2.9.
(1) PIT ERROR
(2) MEMORY REFRESH ERROR
(3) TIMER CH.2 OUT ERROR
(4) CMOS CHECKSUM ERROR
(5) CMOS BAD BATTERY ERROR
(6) FIRST 64KB MEMORY ERROR
(7) FIRST 64KB MEMORY PARITY ERROR
(8) VRAM ERROR
(9) SYSTEM MEMORY ERROR
(10) SYSTEM MEMORY PARITY ERROR
(11) EXTENDED MEMORY ERROR
(12) EXTENDED MEMORY PARITY ERROR
(13) DMA PAGE REGISTER ERROR
(14) DMAC #1 ERROR
(15) DMAC #2 ERROR
(16) PIC #1 ERROR
(17) PIC #2 ERROR
(18) KBC ERROR
(19) HDC ERROR
(20) Built-in HDD ERROR
(21) Select Bay ERROR
(22) TIMER INTERRUPT ERROR
(23) RTC UPDATE ERROR