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Kaosun's CD Players

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az6826 noworking

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 China

Post time: 2016-01-19 19:16:18
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kaosun老师,az6826 CPU tmp78ch20f vdd 3.75 clock 5.9mhz  电池与电源下均不开机,电池模式下显示电量,舱门接线OK,wakeup and reset均为高电平,与私服的信号线路连接也正常,驱动的电压也在待机状态,只等cpu启动。CPU更换过正常的。
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Post time: 2016-01-19 19:29:59
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The battery voltage detection circuit error so it output Low to CPU indicates that the battery is empty, don't turn on the player. You need repair this part at first. We also have SM here for your reference, take a look if you need.
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Post time: 2016-01-19 20:33:14
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Voltage for CPU pin 33 is +5V, not 3.75V. Also check the 7262 NJM3415 which is a "battery voltage detector", it connects CPU pin30 "BLOW".
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 Author| Post time: 2016-01-21 01:10:33
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老大,这个CPU供电PSt574 SM显示PSt574 脚1是由MPC1715的21脚提供的,3.5v, pst574脚3输出到tmp87ch20f脚33,正常机器这个脚也是3.7-3.8V之间,目前CPU 41hold脚 42cl 脚 43da脚 44R/A脚 均无电压,正常机器这些脚都有电压,老大说的7262 njm3415没有在手册找到这个ic
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