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现象:电源开启后有指示但不能走带,各功能键按下后有指示,主导轴不转鼓电机能转,约三秒钟后自停。检修:分析该故障只能出在主导轴本身或驱动电路。经查电机正常。查驱动电路,无17伏工作电压,测电源输入插头CN207的①脚(图3)仍无电压,进一步检查稳压电路,测得Q_(602)基极、发射极无电压。检查稳压二极管D_(603)已直通,R_(601)断路,分析因开机时间过长,D_(603)热稳定性差而击穿,电源经R_(601)直接接地而使R_(601)烧坏,主导轴电机驱动
Phenomenon: There are instructions after the power is turned on, but can not take the tape. After each function key is pressed, there is an indication that the main shaft does not rotate and the drum motor can rotate, stopping for about three seconds. Maintenance: Analysis of the fault can only be in the main axis itself or the drive circuit. Check the motor normal. Check the driver circuit, no 17-volt operating voltage, test the power input plug CN207 ① feet (Figure 3) is still no voltage, and further check the regulator circuit, measured Q_ (602) base, the emitter voltage. Check the voltage regulator diode D_ (603) has been through, R_ (601) open circuit, the analysis of the boot time is too long, D_ (603) poor thermal breakdown and breakdown, the power through R_ (601) Bad, leading axis motor drive