T4900CT
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), (19), (20), (25) or (26) is
displayed, replace the system board.
If error message (18) is displayed, go to the Keyboard Troubleshooting Proce-
dures in section 2.7.
If error message (21) or (22) is displayed, go to the HDD Troubleshooting Proce-
dures in section 2.6.
If error message (23) or (24) is displayed, go to the FDD Troubleshooting Proce-
dures in section 2.5.
(1) TIMER CH.2 OUT ERROR
(2) PIT ERROR
(3) MEMORY REFRESH ERROR
(4) FIRST 64KB MEMORY ERROR
(5) RTC ERROR
(6) CRTC ERROR
(7) VRAM ERROR
(8) KBC 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) KEYBOARD ERROR
(19) KBC ERROR
(20) HDC ERROR
(21) HDD #0 ERROR
(22) HDD #1 ERROR
(23) NO FDD ERROR
(24) FDD ERROR
(25) TIMER INTERRUPT ERROR
(26) RTC UPDATE ERROR
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