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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)
(2)
(3)
(4)
(5)
(6)
(7)
(8)
(9)
(10)
(11)
(12)
(13)
(14)
(15)
(16)
(17)
(18)
(19)
(20)
(21)
(22)
(23)
(24)
(25)
(26)
2-14
TIMER CH.2 OUT ERROR
PIT ERROR
MEMORY REFRESH ERROR
FIRST 64KB MEMORY ERROR
RTC ERROR
CRTC ERROR
VRAM ERROR
KBC ERROR
SYSTEM MEMORY ERROR
SYSTEM MEMORY PARITY ERROR
EXTENDED MEMORY ERROR
EXTENDED MEMORY PARITY ERROR
DMA PAGE REGISTER ERROR
DMAC #1 ERROR
DMAC #2 ERROR
PIC #1 ERROR
PIC #2 ERROR
KEYBOARD ERROR
KBC ERROR
HDC ERROR
HDD #0 ERROR
HDD #1 ERROR
NO FDD ERROR
FDD ERROR
TIMER INTERRUPT ERROR
RTC UPDATE ERROR
T4700CS, T4700CT, T4800CT
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