Sharp CD-E500 Service Manual page 14

CD-E500
CD-E55/E44
7. Button input diagnosis Test Mode (TEST 6)
When the test mode is obtained, the following is displayed.
(STAND-BY AND DEMO OFF STATUS)
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 ON/STAND BY"
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 ON/STAND BY" 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, X-BASS/DEMO, FUNCTION, VOLUME UP/
DOWN, MEMORY/SET, REW, FF, STOP, CD-OPEN/
CLOSE
The OK/NG display of test result is as follows.
8. CD MECHANISM Aging Test Mode (TEST 8)
OPEN/CLOSE & 3 DISC CHANGER aging test.
DISPLAY:
FUNCTION:
Enter the TEST MODE 8, MCU control the 3 DISC
CHANGER OPEN/CLOSE. After open finished, tray rotate
1 circle (360 degree). Then close, After close finished, tray
rotate 1 circle (360 degree) again.
Request:
Every period include 4 operation. Below is TIMING:
Enter test mode
CHANGER
Find the disc 1 position
open
delay 3S after open finish
rotate 1 circle
close
delay 3S after close finish
rotate 1 circle
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