2.4 System board Troubleshooting 2 Troubleshooting
TECRA M4 Maintenance Manual (960-521) [CONFIDENTIAL] 2-19
Check 3 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) is displayed,
go to Procedure 5.
If error message (18) is displayed, go to the Keyboard Troubleshooting Procedures
in Section 2.7.
If error message (19), (20) or (21) is displayed, go to the 2.5” HDD
Troubleshooting Procedures in Section 2.6.
(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) HDD #0 ERROR
(21) HDD #1 ERROR
(22) TIMER INTERRUPT ERROR
(23) RTC UPDATE ERROR
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