Sony hcd v 5500 service manual

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Ñ 3 Ñ SECTION 1 SERVICING NOTE SELF-DIAGNOSIS This model has the self-diagnosis function for the VIDEO and AUDIO decoder sections. Immediately after the power on, the self-diagnosis function searches each operation of ICÕs around the mechanism control microcomputer (IC701). The results can be checked by connecting an oscilloscope to TP709 (LED) of the VIDEO board.Note:The LED for check (D701) is mounted to some sets (FORMER TYPE). In this case, confirm the lighting condition of LED. [VIDEO BOARD] (SIDE A) [VIDEO BOARD] (SIDE B) Oscilloscope (Waveform) Symptom No error External SRAM (IC751) error MPEG decoder (IC201) error DRAM (IC251) error H L Light H L 1 time blinking H L 2 time blinking H L 3 time blinking VIDEO board TP709 (LED)Oscilloscope + _ D701 IC771 TP709 (LED)X901 IC751 IC251