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5. Troubleshooting

The table below summarizes errors to be checked carefully before you determine them to be a fault.

5.1 Errors That Occur When Writing to PROM

(1) When Newly Purchased

(2) Previously Written Normally

Cause

Remedy

Is the adapter attached to the correct position of the PROM
programmer?

Is the switch on the PROM programmer set properly?

Is the MCU attached to the correct position?

Is the area specification set correctly?

Is the correct device selected?

The IC socket of the PROM programmer may be stained. The
socket needs replacing.

See page

Programming adapter

PROM programmer

Contact failure

5.2 When MCUs Do Not Function Normally

If the program operates normally on the emulator, but when the MCU that has normally been written
is attached the same program does not function normally.

(1) Is the offset address specified correctly when copying data into the PROM programmer?

(2) In the emulator, NOPs are often inserted in the area where the program has not been read, therefore

the program happens to appear functioning normally even though it may have gone wild. Check
your program again.

(3) The emulator and the actual MCU may differ in characteristics. Consult the user's manual of the

emulation pod to check for differences in characteristics again.