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SECTION 5
TROUBLE SHOOTING GUIDE
5.1
No Display After Power On
Check the following points if you face a "No Display " problem after power on.
·
The interface cards must be inserted into the system slots properly and the gold fingers on them must be clean. The
gold fingers can be cleaned with freon or alcohol.
·
The CPU must be installed on the CPU socket (U15) in the correct direction. If the CPU is inserted in a wrong
direction, it will cause the "No Display" problem. The worst case is that the CPU may be destroyed.
·
The clock chip speed (JP32, JP34, JP35) must be set to match with the CPU speed. If the clock chip speed is set
faster than the CPU speed, e.g. 50MHz clock chip speed with a 80486SX-25 CPU, the system will have no
display after power on.
·
The SIMMs must be inserted to the sockets (SIM1, SIM2) properly and have complete contact with the socket pins.
Otherwise there will be a "No Dispaly" problem.
5.2
Cannot Boot Up
Check the following points if you face a "Cannot Boot Up" problem.
·
The cache RAM setting (JP44) must be correct and the SRAM must be inserted in the correct position. Otherwise
there will have "Cannot Boot Up" problem.
·
Make sure the hard disk drive / floppy disk drive / IDE controller card / Super I/O card is in good condition. The
cables must be connected to them in the correct direction. Otherwise there will be "Cannot Boot Up" problem
5.3
Lose CMOS Data
Check the following points if you face a "Lose CMOS Data" problem.
·
The RTC DS12887 must be inserted correctly (which contained a battery inside). Otherwise there will be "Lose
CMOS Data" problem.
5.4
No System Management Mode
Check the following points if you face a "No System Management Mode" problem.
·
Check the CPU type. The SMM CPUs can support all the DOZE, STANDBY, INACTIVE modes while the non-
SMM CPU can support only the DOZE mode.
·
The CPU type select jumpers (JP16, JP17, JP21, JP27, JP27-30, JP36, JP40) must be set to match with the CPU
type. Otherwise there will be "No System Management Mode" problem.
5.5
General Notes
1. If, on the first time installation, an error message <CMOS CHECKSUM ERROR> appears on the screen, please
follow these steps : - (a) Leave the system on for about 15-30 minutes to recharge the battery, then you can
enter the system configuration. (b) Alternatively, leave your system on for about 24 hours to recharge the
battery fully.
2. If you have switched off the computer system for more than two weeks, you might be required to recharge the
battery fully.
3. Any hard disk cable longer than the standard type is not recommended for used with PT-431A. Too long a hard disk
cable will make the Green PC circuit unable to monitor the hard disk activity.
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