Panasonic A300MU type DVD player into and out of warehouse is normal, but can't read dish of fault repair methods |
| Time£º2014-05-29 08:36:32 Source£ºNetwork Author£ºUnknown Clicks£º1307 |
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4nsservice manual download site
4nsservice manual download site
PG and FG two pulse signal by the digital servo system is processing and after the clock pulse counting and compared with the reference signal, the rotation error detection and data, the error data by D/A transformation of dc voltage, and control the error of the spindle motor running, signal voltage superposition from IC20012 feet output to the spindle drive IC IC2071 12 feet. Driving circuit according to the error change of dc voltage control, respectively from IC20711, 25, 26 feet output voltage of 9.3 V, have made the spindle motor constant work. When need to stop, the output voltage of 4.9 V to IC207115 IC200134 the feet, control the spindle motor stalling. 4nsservice manual download site
From the above analysis shows that should focus on detecting IC207112 foot control voltage. In the process of laser search measure voltage of 2.5 V, 12 feet normally. Show that the foot before voltage are normal, should focus on inspection and spindle motor drive circuit. Measuring IC207119, 20, 21 feet 12 v voltage and 13 feet 5 v power supply voltage is normal. Because IC20711, 25, 26 feet voltage 2.1 V (normal) should be 9.3 V input and its 12 feet of the control voltage is normal, so the judge fault in or spindle motor driven integration block and its peripheral components. Detection of hall element, motors and IC2071 peripheral components are normal, so doubt IC2071 damage. Replace IC2071 (AN8482SB) after the commissioning, troubleshooting.4nsservice manual download site
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