CD-XP110 (serv.man17) - Sharp Audio Service Manual (repair manual). Page 10

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PLAY + DISC SKIP 

test04

TIMER ON/OFF TEST MODE

FL DISPLAY:

STOP + DISC SKIP

test05

VFD DISPLAY WINDOW TEST MODE

FL DISPLAY:

VFD ALL LIGHT

FUNCTION:

TEST THE VFD DISPLAY WINDOW

PLAY + OPEN/CLOSE  test08

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