Epson PC AX Technical Manual page 132

TROUBLESBOOTIBG
4.2 TROUBLESHOOTING
REV.A
The BIOS ROMs in the EQUITY 111+ / EPSON PC AX computer system are including a
diagnostic program which will perform the check for internal computer system
automatically.
We call the test program "POD" (Power On Diagnostics).
The POD will output ERROR MESSAGE to the CRT screen or eight LEDs on the MFG
Board if error is occurred in the EQUITY 111+ / EPSON PC AX computer system.
The error message will be useful at repair because we can determine the
probable cause by using this error message.
4.2.1 How to Use the
pon
(Power on diagnostics)
1. Connect a monitor and a MFG Board to the EQUITY 111+ / EPSON PC AX computer
system.
2. Turn the power switch of the EQUITY 111+ / EPSON PC AX. The POD will start
automatically and check internal circuits step by step automatically.
3. When error is occurred, the error message will appair on the monitor screen
or LEDs of the MFG board.
(The POD does not show good message when no error)
4. Search the 'RESPONSE
AND
INFORMATION FOR ERRORS' and find the corresponding
probable cause yourself.
4.2.2 How to Use the MFG Board
1. Function of the MFG board.
The MFG board is a service tool which can display data status (data bus
bit 0 to bit 7) on the eight LEDs.
This board can display data status of 1/0 address OOO(H) to FFF(H).
We can select the 1/0 address by using DIP switch.
2. How to set the DIP switch
Each switches of the DIP switch are corresponding to address bus AO to
All as follows.
DIP
SWITCH
8 7
6
SW2
5 4
3 2
1 4
SW1
3 2 1
CORRESPONDING
ADDRESS
All A10 A9 A8 A7 A6 A5 A4 A3 A2 Al AO
*
When setting the DIP switch, please use following instance.
4-2