Sharp XL-520H Service Manual page 15

7. Key input diagnosis Test Mode (TEST A)
When the Test Mode is set, the following display appears.
In this Test Mode checking as to whether all the main unit keys can be detected is performed. Accordingly, when this mode
is set, checking is performed so as to examine whether the POWER key was pressed last after all the following keys were
pressed. If the result is OK, the following OK is displayed. If any one of keys was not pressed, an error is indicated. When the
POWER key is pressed, exit from the mode is made irrespective of whether the termination is normal or abnormal, and the
standby mode is set.
All the models using this microcomputer do not have the same keys. The entry of the following keys is detected depending on
the combination of simultaneously pressed keys when this mode is set. Key pressing order is not fixed. Pressing of all keys
must be detected.
1. In case of "SRS" + "RDS PTY-TP"
Since the model does not have RDS and SRS, all the keys to be detected are the following 15 keys.
PLAY, VOL , VOL , BAND, G-EQ, FUNCTION, MEMORY/SET, REC PAUSE, REW/REV, FF/FWD, STOP, SRS
RDS ASPM, RDS DISPLAY, RDS PTY-TP
OK/NG indication of test result must be as follows.
NG indication
OK indication
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XL-520H,520E/CP-520,520E