Check the focus, tracking movement is normal, also have the normal laser emission, but spindle motor does not turn. Analysis of some of the reasons for spindle motor does not turn, but by the maintenance experience, judge fault should be in the drive circuit, the spindle motor or power supply circuit. In addition, when the laser component or its affiliated circuit may also result in spindle motor does not turn bad. NUrservice manual download site
 NUrservice manual download site
According to the results of the preliminary examination, analysis of laser components) are less likely to damage, should check the power supply circuit, mainly spindle drive circuit and the motor itself. Measure the power output each voltage is normal, so the judge fault in the spindle or spindle motor drive circuit. The appended drawings is block diagram of the machine spindle servo circuit. When the disc after putting in place a levite, microprocessor IC6001 (N64405FP) for automatic detection and control related circuit, baldheaded and emits laser focus to search at this time. When the CPU detects focus if signal, can issue instructions to the driver circuit, make the spindle motor rotation, started to read disk directory into the process. This paper analyzes the reason of the spindle motor does not turn may be associated with a particular link is wrong. NUrservice manual download site
 NUrservice manual download site
First measured spindle drive circuit IC2071 (AN8482SP) of 1, 25, 26 feet voltage, are 2. 1 V (normal is 9.3 V). The drive voltage on the low side, there are two reasons: one is the exception error control circuit; The second is driving integrated circuit itself is faulty. NUrservice manual download site
 NUrservice manual download site
The machine drive error control voltage by the IC5001 (AN8824FBP) 64 feet output RF signal through IC7001 (AN8623FBQ) of 62 feet, with external IC700114 foot 27 MHZ clock frequency and the microprocessor IC6001 internal PLL data comparison, control the error of the spindle motor running signal and the spindle motor phase control of PG pulse signal, respectively from IC700117, 9 feet after the output to the servo processor IC2001 (MN67700), 75, 47 feet. IC200136, 37 foot external 40 MHZ crystal, its 45 feet from the spindle motor driver IC IC207116 feedback spindle motor speed control FG pulse signal.

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