PCR (Primary charge roller) yog ib txoj kev them nqi tshiab uas tsis ua rau ib puag ncig puas tsuaj. Txoj kev no txo qhov tsim cov ozone thiab them nqi sib npaug yam tsis muaj suab nrov. Nws siv dav hauv cov tshuab luam ntawv laser thiab tseem siv rau hauv cov tshuab luam ntawv ceev qis.
