Have you thought about looking at the laser unit.
你有否想过在激光发射器看。
Could be the laser unit itself and cleaning might not do anything.
可能是激光发射器本身和清洁可能不会做任何事情。
You can hear the laser unit motor spin when you boot the machine up.
你能听到马达旋转激光发射器当你启动机器了。
You can hear the laser unit motor spin when you boot the machine up.
你能听到马达旋转激光发射器当你启动机器了。
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