Figure 3.3.1.5 Servo drive circuit diagram
U301
BA5954
Example 17 No disc reading
Analysis and troubleshooting: shown in the figure 3.3.1.5, Step 1: check the nerve flat cable socket
on XS301 and find no abnormality.
Step 2: change loader, disc reading is normal and trouble is removed.
Example 18 No disc reading
Analysis and troubleshooting: Step 1: check XS301 flat cable and socket and there is no abnormality.
Step 2: change loader and trouble still exists.
Step 3: check power supply, observe laser head, main axis and they are both normal, but bu fucus.
Step 4: check BA5954 power supply and reference voltage and they are both normal.
Step 5: check MT1389 power supply and it is normal.
Step 6: check the path between pin 42 of MT1389 (focus error signal output) and pin 1 of BA5954,
and find that there is capacitor electric leakage among C210, C211, C212 and C213; change one by one
and find that after changing C213, trouble is removed, which means that C213 has electric leakage.
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