User Guide

2.4 System Board Troubleshooting 2 Troubleshooting Procedures
If one of the following error messages (1) through (17), (24) or (25) is
displayed, go to Procedure 4.
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.
If error message (22) or (23) is displayed, go to the 3.5” FDD Troubleshooting
Procedures in Section 2.5.
(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) NO FDD ERROR
(23) FDC ERROR
(24) TIMER INTERRUPT ERROR
(25) RTC UPDATE ERROR
Satellite A50/TECRA A2 Maintenance Manual (960-478) 2-19