A good and useful manual. With these, We was abled to isolate and pin point the component that was causing the problem. The total time spent in troubleshooting is very much reduced.
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Text excerpt from page 24 (click to view)
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[2] Symptoms That May Occur When Any Of The Following ICs Is In Failure
IC
A
Symptoms
16M Flash ROM The power cannot be turned on. (DVD MT PCB Assy : IC4004) Downloading of the firmware cannot be performed. DVD IC Any kind of symptoms (no power, a failure in any of the servo, video and audio systems, etc.) may be (DVD MT PCB Assy : IC4001) generated, because the DVD processing is performed by a single chip. 64M SDRAM No power. (DVD MT PCB Assy : IC4005) Block noise is generated during playback.