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故障一：工作方式转换（STOP－CHECK－START）有时工作正常，有时停止在STOP方式不能转换到CHECK和STARTI作方式。工作方式转换电路是由触摸开关，IC202（TC9135P）及其它外围元件组成。因上述故障为无规律的出现，怀疑是触摸开关接触不良。用随弃式注射器吸上纯酒精灌到开关里
Fault 1: STOP-CHECK-START sometimes works normally, sometimes it stops in STOP mode and cannot be switched to CHECK and STARTI. The working mode conversion circuit consists of touch switches, IC202 (TC9135P) and other peripheral components. Due to the above irregularity, it is suspected that the touch switch is in poor contact. Use a disposable syringe to suck pure alcohol into the switch