Sharp XL-3000 Service Manual page 18

XL-3000/3000C
6. LCD Test Mode (TEST 5)
When the LCD test mode is obtained, all the LCD segments are lighted. Then pressing the "PLAY" button switches display as
below.
Lighting of all segments
7. Key input diagnosis Test Mode (TEST 6)
When the test mode is obtained, the following is displayed.
This test mode is intended to check whether all the main unit buttons can be detected. Accordingly, in this test mode, it is checked
whether the "POWER" button was pressed after all the buttons shown below were pressed. If the result is OK, OK is displayed.
If any one of keys was not pressed, an error is displayed. In both cases of OK termination or error termination, the mode is shifted
to the standby mode if the "POWER" button is pressed subsequently.
All models using this type of microcomputer are not always provided with the same buttons. Since the buttons used are different
depending on models, types of buttons to be used are determined by whether SURROUND, and an electric lid are available
at the initial setting by MODEL port.
The order of buttons to be pressed is not determined. Accordingly, it is checked whether all buttons have been pressed.
1. PU-IN buttons: REW/PRESET DOWN + CD STOP
Since this model is provided with SURROUND (HAVE OR NOT), and electric CD lid, the following 10 buttons are detected
as all buttons.
PLAY, BASS/TREBLE, FUNCTION, VOLUME UP/DOWN, MEMORY/SET, REW, FF, STOP, CD-OPEN/CLOSE
The OK/NG display of test result is as follows.
Lighting of odd segments
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Lighting of even segments