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REV.-A
Next, the CPU starts the RAM check.
The diagnostic ROM performs three types of RAM tests: a read/write check, an address check, and a
refresh check, and if an error occurs the LCD panel displays the location of the IC containing the error.
If the CPU finds an error, it will be indicated on the display as follows:
For the backup RAM (IC 13C), the CPU checks only the RAM area used for the input buffer and the system
area.
In the case of an error on IC 11 B only:
I
RAMO( 1 1B) RD/WR ERR.
I
RAMO( 11 B) ADDR. ERR.
RAMO( 11 B) REF. ERROR
In case of an error on IC 13C only:
[ RAM 1(1 3C) RD/WR ERR.
I
I
RAM 1(13C) ADDR. ERR.
I
Replace RAM chip IC 11 B.
Replace RAM chip IC 11 B.
Replace RAM chip IC 11 B or IC8B.
Replace IC 13C.
Replace IC 13C.
In case of errors on both IC 11 Band IC 13C:
The READY LED blinks on/off. Replace IC 11 C and IC8B.
When the RAM check finishes, the buzzer eill sound.
After the above diagnostic operation is finished, the following message will be displayed on the LCD
panel.
RAM CHECK FINISHED!
Diagnostic ROM(X.OO)
The RAMs are normal.
ROM version is displayed.
Then the mode selection screen is displayed on the LCD panel.
FF:dwn LF:up L/E:set
Mode selection screen displayed.
5-14
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