Sharp XL-DK225 Service Manual - Page 55
Although a CD is inserted and the cover is closed, NO DISC is displayed., Focus-RF system check.
UPC - 074000368682
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(1) Focus-RF system check. Although a CD is inserted and the cover is closed, "NO DISC" is displayed. Press the Tray1 CD Eject Button without inserting a disc, and try starting the playback operation. 1 FDO IC1 22 2 TDO 23 IC1 XL-DK225 1. Does the pickup move to the PICKUP-IN Switch (NSW1) position? Yes 2. Does the focus (lens) move up and down? (Waveform drawing Figure 1) Yes 3. Is the laser lit? Yes 4. Is the turntable rotating? When a disc is loaded, start playback operation. 1. Is focus servo activated? (Waveform drawing Figure 2) Yes 2. Is the RF waveform normal? (Waveform drawing Figure 3) No Sled motor (NM2). Figure 1 No Check the focus peripheral circuit. No Check the laser diode driver Q1 peripheral circuit. No Spindle motor (NM1). No Pins 5~9, 11, 18 19 and 22 on IC1 Check the laser diode driver Q1 peripheral circuit. No If the level is not normal. 1 22 FDO IC1 3 TE 16 IC1 Figure 2 4 2 IC1 RFOUT Figure 3 7 - 2