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) 8. CD MECHANISM Aging Test Mode (TEST 8) OPEN/CLOSE & 3 DISC CHANGER aging test. DISPLAY: 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. 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 - 14 -