lỗi printer

1. In qu chm

Cch khc phc li my in nhanh chng bng cch n gin nh. i vi ngi sdng my tnh, in n l mt khu kh quan trng. Tuy nhin, khng phi lc nochic my in cng hot ng trn tru v lm hi lng bn. Di y l 10 vn thng gp vi my in v cch khc phc.

CCH KHC PHC LI MY IN NHANH CHNG V N GIN NHT

10 li my in thng gp v cch khc phc

Cch khc phc li my in nhanh chng bng cchn gin nht

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Vi my in HP, ch cn chn Fast Draft Quality l tc in s c ci thin ng k.

Nu bn cm thy my in qu chm, ch cn mt vi thao tc l c th tng tc my inng thi tit kim mc in. Li khuyn y l hy gim cht lng bn in xung mtcht.

i vi Windows, bn ch cn vo Print and Properties v chnh cc setting lin quan ncht lng in. V d, vi my in HP PhotoSmart 8450, bn ch cn chnh Print Qualitysang Fast Print.

Ngoi ra, bn c th tng tc in bng cch gim thiu cc hnh nh trong file in hoclp thm RAM cho my in (nu c, ty tng model my).

2. Gi mc in qu t

Hin nay c rt nhiu hng bn my in bn nhng chic my in gi r nhng mc in rtt. Tnh trng ny din ra nhiu nm nay v ngi dng tr thnh nn nhn trc tip.

C hai cch khc phc iu ny l: mua my in c hp mc ln v bm mc ca hngth ba.

Tt nhin, ci g cng c gi ca n. Khi bn s tit kim c kh nhiu chi ph in n thmc ca hng khc c th lm gim tui th my in ca bn v cht lng bn in skhng th tt bng mc in chnh hng.

3. Windows gi lnh nhm my in

V mt vi thay i, Windows c th s nhn mt my in khc lm my in mc nh v khi n s khng gi lnh in ti my in bn mun dng m t ng chuyn n my inkhc.

Tnh trng ny kh ph bin khi nng cp t Windows Vista ln Windows 7. chn limy in mc nh, bn ch cn lm theo cc bc sau: click vo Start ( biu tng ca s gc pha di bn tri mn hnh), chn Devices and Printers. Trong mc Printers andFaxes, bn click chut phi vo my in mun chn ri chn mc Set as default printer.

Trong XP v Vista, bn click vo Start, chn Control Panel/Hardware and Sound, ri clickvo Printers, sau click chut phi vo my in mun chn, chn Set as Default Printer.


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Cch chn li my in mc nh trong Windows 7.

4. Bn in m, c m hoc sc ngang

Hin tng ny xy ra l do u in ca bn b tc, nguyn nhn thng l do s dngmy in phun khng thng xuyn. Mt s phn mm tin ch v in n c th lm schmc kh v in mt trang th nghim kim tra.

Thng thng, bn c th tm phn mm tin ch ny bng cch click vo Devices andPrinters hoc Control Panel t menu Start, sau tm phn mm trong .

Mt vi tin ch c th lm sch mc kh gip ci thinbn in.

5. My in bo ht mc sm

C kh nhiu trng hp hp mc vn cn nhng my bo ht. Cc thng bo htmc in vn ni ting l khng ng tin. Tuy nhin, vi mt vi th thut, bn c th in ngit cui cng ca hp mc.

Nu dng my in HP, bn c th lm theo cch sau. u tin tt my tnh, tho hp mcra v dn bng dnh vo cc s 1 (trn hnh), lp hp mc vo ri khi ng my tnh,my in s t ng in mt trang kim tra. Sau ta tho hp mc ra v dn bng dnh vocc s 2, li lp vo v in.

konico

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TOP Chuyn gia

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My in s pht ra vi ting n nh. Tip tc tt my v tho hp mc, dn bng dnh vocc s 3 v 4 ri lp li. Bn bt my in ri ch mt lc v tt i.

Tip theo bn tho hp mc v bc ht bng dnh i, lp hp mc vo, ch mt lc li tti v bt li, by gi my in s khng bo ht mc na. Bn c th in ht mc, bm mcngoi vo hp mc ri dng cch trn bo vi my in l hp mc cn y.

Cc cc cn can thip "lm mi" hp mc c.

i vi hp mc my in Epson thi n gin hn, bn ch cn dng mt ci kp gim giyhoc bt k vt g c u nhn chc vo l reset hole nh hnh di. Cc cch trn himo him nhng nu thnh cng, bn c th tit kim thm cht chi ph in n trong thibui t ny.

Vi mt cht tm ti v kho lo, bn c th lm cho my in chu in ti git cui cng cahp mc.

6. My in wifi chy qu chm

My in chun Wifi th tin dng tht nhng v n nh v tin cy th khng th nh bic my in thng thng. Cng ngh wifi hin nay vn cn nhiu hn ch v tm phsng.

Nu bn nhn thy my in wifi ca mnh in chm qu th hy th chuyn v tr my in li

Cch khc phc li my in nhanh chng bng cch n gin nht

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gn thit b pht sng (router WLAN, modem Wifi) hoc gim bt cc vt c th che sng.

Ngoi ra, bn c th chuyn sang cng ngh Wifi chun n (802.11n) vi tm pht sngrng v tc truyn ti cao.

Tuy nhin, d th no th mt my in WLAN cng khng th hot ng n nh bng mtmy in qua mng c dy.

My in Wifi th tin li, nhng khng th n nh bng dy.

7. Bn in xu do dng mc ti ch hoc mc bm ngoi

Ngoi th trng hin nay c kh nhiu loi mc in gi r. Tuy nhin, cc loi mc in nya phn c nhiu tp cht, khng th thot ra ht khi u phun rt nh trong my in.Nhng cn bn ny lu ngy s tch t u phun v lm hng u phun khi c p lcmc trong lc in n.

Mc in ngoi cn cho cht lng bn in km hn so vi mc chnh hng. V th, bn cnphi la chn mc in k cng. Ty theo s lng trang in mi thng, cht lng bn incn thit v chng loi my in, bn c th chn c loi mc in ph hp. Trong nhngtrng hp ny, mc in chnh hng l l s la chn sng sut.

8. Lm th no in nhiu trang vn bn trn mt mt giy

In nhiu trang hn trong mt trang in l mt cch tit kim mc in v tng thi gian in.Thng thng bn c th in hai trang vn bn trn mt mt giy i vi cc giy t nhbng tnh, ha n, phiu thu... hoc vi cc ti liu c c c ch to.

Trong Windows, bn n Print, sau chn Properties ri thit lp ty chn in hai trangvn bn (chi tit ty thuc tng loi my in).

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Ricoh, v Xerox...

Vi nhng chic my nh th, bn s rt kh chu v thng xuyn phi np thm giy.Do trc khi mua my in, bn nn tham kho danh sch nhng nh sn xut "keokit" chuyn a ra cc sn phm c khay giy qu ti.

c bit khi i chn my in, bn nn xem xt cn thn khay giy ca my in. Nu n qumng mnh, bn nn chn mu khc. Nu khay giy nh, khng ph hp vi nhu cu inn ca bn, bn cng nn xem mt model khc.My in Laser cc li thng gp v cch khc phcHi cc bro, sau khi tm hiu th xin c tng hp 1 s li thng dng, nguyn nhn gyra li ca my in laser ni chung hy vng s gip cho cc bro c thm 1 cht kin thc vmy in. y c 1 s li mnh s a ra hng khc phc lun.

1. Li in c mt vt en chy dc- Gt t b mc c c bm cht -> nn v sinh- Gt mc thu hi b hng -> nn thay

2. Li in ra nhng chm nh- Trng ( Drum ) b st m b mt -> nn thay

3. Li in en ton bn in- My in b tha mc thu hi -> nn mc thu hi v v sinh thng xuyn

Hnh nh ny c thay i kch thc. Click vo y xem hnh nh gc vi kch thc l768x1024


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4. Li in vt en ngang bn in- My in b hng cao su trung ha in tch hp mc -> thay th l ht

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5. Li in ch khng nt, m v khng m- Nn v sinh gng phn x v c th b bn- C th loi mc dng khng tt, loi bt t c trong mc tch in km- Gt t mt tnh n hi hay v trc t qu mn- Mt s my in c ch tit kim mc ( economy ), nu chn ch ny my s in mhn bnh thng, bn ch cn b chn economy ( hay economode ) l s in m nhbnh thng.


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6. Li in my in b nhe- Giy in c vn nh m, mng- mc khng ng cch, khng ng loi cng gy ra hin tng ny- Trng do my in mua lu nn kh nng trng ca n km i- L sy khng nng cng c th b hin tng trn.

Mt cht c kt ring :Sau khi tm hiu, mnh c kt l nu bn c kh nng ti chnh th nn xi mc in chnhhng v s trnh c kh nhiu li v gip cho tui th ca my cao hn. Ngoi ra thngthng nu chn mua my in Laser th nn chn hng HP hay Canon v my in laser ca2 hng ny thng bn tt hn cc hng khc.

Li my in khng hot ng1. n my in khng sngC l khng cn phi ni nhiu v hin tng ny. n Power trn my in gip ngidng bit c ngun in c np vo my in hay cha. Do vy, khi thy n khngsng th bn ng vi lo, v rt c th u dy ngun ni vi ngun in hoc ni vi mycha n.


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Hn na, nu chc chn hai u ni cht, bn hy ngh ti dy ngun trong my in.Si ny gm rt nhiu dy nh li ti, v vy nu v tnh cn trng hay vt st ct vo thrt d b t (ch mt si t cng lm mt ngun my in). Bn c th thay dy ngunmi th rt d dng. Cn nu b h dy ngun trong my th bn cng c th mua mtsi dy ngun tng ng thay hoc ra cc trung tm vi tnh nh thay gip.2. n my in sng, nhng khng hot ng khi nhn PrintPhn cng:Mt trong cc nguyn nhn ca hin tng ny l do si ng thanh t quay mc bt. Vic t si ng ny rt d xy ra khi bn g bnh mc ra thay, c bit l bnh mcphi dng cc thit b cng tc ng mnh m np bm mcCch khc phc: Bn c th bnh mc mi c cha c thanh t hoc mang bnh mci sa cha. c bit, cng c th xy ra trng hp dy cp ni my in v my chatht cht.

Phn mm:

Mc nh, trong Windows s thit lp Microsoft XPS Document Writer lm my in mcnh. Do vy, sau khi ci driver cho my in th bn cn chn li my in mc nh nh sau:Vo Start > chn Devices and Printers. Trong danh sch cc my in hin ra, bn nhnphi chut vo tn ca my in mnh ang gn vo my v cn dng, ri chn set asdefault printer.

Nu danh sch trn khng hin th tn my in bn ang kt ni vo th hy ci t loidriver mi nht ph hp vi phin bn Windows mnh ang dng.

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Trong lc in, bn thng gp mt s li n gin nh ti liu b m mc, th t trang inb ngc, l bn in khng ng vi bn trn my tnh... Nhng th thut sau s gip bnvn hnh my in bnh thng.1. Trt t trang in b ngc- Triu chng: Trong lc i bn in u tin ra l, bn cht nhn thy rng trang cuicng ra trc v trang u tin li lo o ra sau cng. Thc ra, chuyn ny khng hnh hng n cht lng in, nhng s khin cho bn phi tn cng sp xp li trt tcc trang.- Chn on: Thit lp my in b sai do bm nhm hoc li trnh iu khin, h iuhnh lm pht sinh li ny. Dn k thut gi hin tng ny l li Front to Back.- Khc phc:+ i vi Windows XP, bn vo menu Start > Settings > Printers and Faxes, nhn phichut vo biu tng my in ang li v chn Properties. Trong th General, bn nhnnt Printing Preferences. Tip tc, ti mc mc Page Order ca th Layout, bn chn lithnh Front to Back > Apply > OK.

+ Vi Windows Vista/7, bn vo Start > Control Panel > Hardware and Sound > Devicesand Printer > chn tn my in b li. Sau , nhn chn Display Printer Properties v thitlp tng t nh trn Windows XP.

2. Canh l v ngt dng ca bn in khng ng vi vn bn gc trn my- Triu chng: Cc l ca trang giy sau khi in b hp, i khi mt ch hoc tha qunhiu. iu ny lm mt tnh thm m ca trang in.- Chn on: Bn cha thit lp li c giy in chnh xc cho vn bn. Chng hn, vnbn dng Letter (21,59 x 27,94 cm) nhng bn li in trn kh A4 hay ngc li.

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- Khc phc: Trong trng hp ny, t chng trnh ca b Office 2003, bn vo File >Page Setup (hoc vo th Page Layout > nhn nt mi tn gc phi vo Page Setup i vi b Office 2007/2010). Tip tc, bn nhn th Paper trong hp thoi Page Setupv sau xem trong mc Paper Size bit loi giy chng trnh s dng in ti liu.Nu bn thy mc Paper Size l A4 - 21x29.7 cm th y l mt kh giy tiu chun. NhnCancel trong hp thoi Page Setup v thc hin cc bc sau y gii quyt vn ny:+ i vi Office 2003, bn vo Tools > Options m hp thoi ty chn > vo th Print >nh du vo ty chn Allow A4/Letter Paper Resizing > nhn OK.

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+ i vi Office 2007/2010, bn nhn vo Office Button > Word Options > chn thAdvanced > ko xung mc Print > nh du trc ty chn Scale content for A4 or 8.5x11 paper sizes > OK.

+ Tin hnh in ti liu bnh thng.Ch : Bn phi thit lp c giy in trong chng trnh son tho trng vi c giy angdng ca my in c bn in p nht.3. Khng th in c v lin tc bo li- Triu chng: Khi in, my bo li in tht bi This document failed to print xem hnh.

- Chun on: Rt c th bn cha bt my in hoc cha cm in ngun, hoc chac quyn in trong mng ni b.


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- Khc phc: Vi my in cc b, bn phi kim tra xem dy ngun ca my in ccm vo in, my in c bt v ni vi my tnh thnh cng hay cha. Cn i vimy in trong mng, bn cn kim tra thm dy cp kt ni gia my tnh v my in, v cbit cn xem xt li quyn s dng my in mng c thit lp dnh cho mnh hay khng.Bn dng php loi tr cc trng hp nu trn c cch khc phc ng.4. Xut hin cc m mc trn ti liu c in ray l trng hp kh ph bin do ngi dng my in bo qun giy khng ng cch.Chnh iu ny dn n giy b m khi in, hay s dng giy in km cht lng. Bncnh yu t v cht lng mc in ang s dng cng cn xem xt li. Hng giiquyt cho trng hp ny cng kh n gin, bn cn mang my ra dch v h lm vsinh cho thit b u in v thay th giy in c cht lng hn.

5. Bn khng th in cc ng vin tranga s cc my in khng th in text hay hnh nh nm qu gn mp ca trang. Theo mcnh, cc ng vin nm gn mp ca trang, y l l do ti sao my in ca bn khngth x l chng. Cch gii quyt s c ny nh sau:+ Chn Format > Borders and Shading > chuyn qua th Page Boder > nhn nt Options m hp thoi Borders and Shading Options.+ Bn di Margin, bn nhp cc kch c (tnh theo im nh) ln hn vo cc hp Top,Bottom, Left v Right di chuyn cc ng vin hi ra xa khi mp ca trang. Numun ng vin trang m st on vn bn th trong mc Measure from, chn Text > OK> OK.

+ i vi Office 2007, bn qua th Page Layout > Page Boder > Options > thit lp nhtrn phin bn Office 2003.


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6. Vn bn in thiu hnh nh- Triu chng: Vn bn in ra mc d text hin y nhng hnh nh li bin mt, thayvo l cc vng trng trng trn.- Chn on: C th my tnh ca bn b thiu b nh (Low Memory).- Khc phc: Thc hin trnh t cc bc sau:+ Th tt my, khi ng li my tnh v in li. Nu vn khng khc phc c, hy kimtra nhng kh nng di y :+ Trong Word 2003, bn chn File > Print > nhn nt Options trong hp thoi Print. Tca s Print th hai, bn nhn du chn trc Drawing Object > OK. Cng ti y, hynh du vo hp kim Draft Output yu cu Word in cc ti liu vi t nh dng(format) hn. Ty chn ny dng lm vic vi cc ti liu trong giai on sa bn in.+ i vi Word 2007, bn vo Office Button > Word Options > chn th Display > nhdu trc ty chn Print drawings created in Word.

7. Header v Footer xut hin khng chnh xc hoc thiuNu header v footer ca bn khng nm va trn trang, khng c ch trng trong ldnh cho header hay footer hoc chng nm trong phn khng in ra ca trang. to nhiu ch trng hn cho cc header v footer, hy chn File > Page Setup > chnth Margin trong hp thoi Page Setup v phng to l trn v l di. Tip , bn quath Layout v tng khong cch From Edge header v footer khng b y vo phnkhng in ca trang.


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Lu : s dng my in c hiu qu, bn nn chn mua chng loi giy in theong yu cu ca sch hng dn i km, khng nn mua nhng giy in km chtlng nh qu mng c th dn n trng hp kt giy, v khng giy in trong mitrng m t v c th dn n hin tng dnh cc m mc trn giy.

Ngoi ra, vic thng xuyn cp nht trnh iu khin (driver) cho my in t website canh sn xut ci thin hot ng ca my in nh sa li cc s c in n trong my vc thm nhiu tnh nng mi. Cui cng, bn nn dnh thi gian v sinh my in hngtun, khng bi bn bm vo my in hay giy vn st li trong my v s dn n hintng kt giy, v nht l bn phi gi cho u in (printhead) lun c sch.

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THAM KHO THM: Nhng cch phc li giy my in phun mu1. My in khng cun c giy:* Do sp xp giy khng ngay ngn: Sa giy li cho ngay, cnh giy phi thng v chmht xung y ca khay giy.* Giy qu nhiu lm cht cng trong khay giy: Gim bt s lng giy.* Giy qu dy v cng: Thay giy mng hn.* Thanh chn giy kp qu cht: iu chnh li thanh chn giy nm hai bn hng khayng giy li cho va. (Xem hng dn cch s dng v bo qun my in phun mu)* Bnh cao su ko giy b d, mn: cui khay giy c mt bnh cao su ko giy, hylau sch n bng vi mm kh hoc m. Khng c dng tay d chm vo bnh caosucun giy.Lm cho giy ri ra - -Xp xp giy cho ngay2. B kt giy:* Khi t giy vo khay phi iu chnh b phn chn giy va st vi cnh giy, khngqu cht cng khng qu lng. Nu kp qu cht giy s khng cun c, nu qulng giy s b lch khi my in cun giy.

Giy qu dy v cng: Khi ko vo na chng th trc ko giy khng ko ni na, cnphi thay giy mng hn. * Do giy b rch hoc b cong vnh nn vng vo cc b phn ca my gy kt giy.Khi b kt giy phi rt giy ra theo chiu di chuyn ca giy khi in v b i, khng cs dng li. Kim tra v ly ht giy b rch cn kt trong my. Nu giy vn tip tc b ktth nn xem xt li cht lng giy hoc b phn ko giy.3. My khng in:* Li "This document failed to print": Do cha bt cng tc my in, cha kt ni my in vimy vi tnh hoc y cp kt ni bi hng.* My in ang trng thi Offline: Truy cp vo Start menu -> Printers and Faxes -> nhnnt phi chut vo biu tng ca my in v chn Use Printer Online.* My in ang trng thi Pause (tm dng): Truy cp vo Start menu -> Printers andFaxes -> nhn nt phi chut vo biu tng ca my in v chn Resume Printing.4. Li bn in:* Bn in b nhe: Do tc, lng (ca sc vt) hoc x giy bm vo khay cha bnh mchoc u phun, tm v gp chng ra khi u phun. i vi mt s my c u phun nmtrn bnh mc th c th tho bnh mc ra kim tra, dng giy mm lm sch xungquanh u phun, khng c chm vo u phun. Bn in b t do mc qu nhiu: Li ny do s dng loi giy thng (Plain) m lichn cc ch in cht lng cao. Phi lu chn ch in v loi giy thch hp. (Xemhng dn cch s dng v bo qun my in phun mu) * Bn in b dnh mc tha: Kim tra v lau kh cc vt mc dnh trn cc b phn cungiy ca my in. * Bn in b mt nt, mt mu: Do my b nght mc, cn dng chc nng lm sch uphun v in th cho n khi mc ra cc mu. Do mi ln lm sch u phun s rt haomc nn ch s dng khi tht s cn thit. Nu mc b nght t th c th khng cn dngchc nng lm sch u phun m ch cn in vi bn vi ch Best l mc s ht nght. 5. Li kt lnh in: * V l do no m c mt hoc nhiu bn in u tin b li khng in c lm cho ccbn in sau cng s b kt li. Cch x l l truy cp vo Start menu -> Printers and Faxes-> nhp p chut vo biu tng ca my in (hoc nhn nt phi chut ri chn Open) m ca s ca my in ra. * Trong ca s ny bn s nhn thy cc dng lnh in v mt trong s s c tnh


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trng li "Error Printing", nhn nt phi chut vo dng lnh in b li v chn Restart inli hoc Cancel hy b lnh in ny. * C th phi mt mt thi gian kh lu chng trnh hy b lnh in, sau khi hy bht cc lnh in b li th cc lnh in tip theo mi c thc hin. 6. My in ht mc: * Thng thng khi my in ht mc th trn mn hnh s hin th thng bo ht mcng thi n bo mc cng s sng v khay cha cc hp mc s t ng chy ra v trthay mc. * Ty theo mi loi my s c cch bo ht mc khc nhau nh hin th ht mc muno trn mn hnh hoc hy ch v tr thay mc, trn s c mt mi tn lm du,hp mc no nm ngay v tr ca mi tn l hp mc b ht, cn phi thay mi. i vi my in c mi mu ring mt hp mc th khi ht mc no ch thay hp mc ,cn i vi my c cc mu chung mt hp mc th cho d ht mt mu cng phi thaylun c hp. * Thng thng bn trn hoc pha trong np my c dn bng hng dn cch thaymc, nu khng c th bn nn tm xem trong sch hng dn km theo tranh thaotc sai lm hng my in. * Trn mi hp mc u c ghi r m s, bn ch cn mua hp mc c ng m s nyl thay vo c. Lu : * Chng trnh tin ch lm sch u phun c ci t km theo chng trnh iukhin (Driver) ca my in. Cch s dng cng khc nhau ty theo mi loi my, nn xemtrong sch hng dn km theo bit cch s dng. * Khng nn hp mc bn ngoi qu lu, v u phun c th b kh lm cho nghtmc. BO QUN MY IN PHUN MU :Trn y l 6 cch khc phc s c. Tuy nhin, my in phun mu lun hot ng tt,bn cn bit cch bo qun nh sau:* S dng cc loi giy c cht lng tt, khng b rch, khng c nhiu x giy... Xgiy c th dnh vo u phun lm lem mc hoc c th gy nght mc.* Khng in trn cc loi giy c b mt sn si, b nhn hoc cong vnh v c th b ktgiy, lm h b phn cun giy v c th lm hng u phun mc.* S dng ng loi giy ph hp vi mi ch in c bn in p v khng b lemmc.* Phi dng giy in c kch thc ng vi bn in, nu giy in nh hn th mc s bphun ra ngoi lm d my hoc c th thm vo cc b phn khc gy h hng.* S dng mc ca chnh nh sn xut c bn in p, mc km cht lng c th gyhi cho u phun.* Do my in phun dng mc dng lng nn sau khi in khng c chm tay vo bn in trnh b lem mc, thng thng mc s kh hon ton sau 24 gi.* Sau khi bt my ln th nn n ch thng trc cho n ht phin lm vic,trong ch ch my rt t hao in. Mi khi m my, mt t mc s c phun ra lmthng u phun, nu m/tt nhiu ln s lm hao mc.* Khi s dng xong nn tt bng nt On/Off trn my in, khng nn tt bng cch rt dyhoc ngt ngun in. My in phun c c ch bo v cc u phun, khi tt my bng ntOn/Off th u phun s c a vo v tr an ton c bo v v trnh kh mc u phun.* Khng nn t my trong mi trng m, nng, nhiu bi,... bi bn s lm nght uphun.* t nht mi tun nn in mt bn en v mu thng mc, nu lu khng s dngu phun s b kh d b nght mc.* My in c sn chc nng hin th mc v bo khi ht mc, khng cn thit phi t thobnh mc ra kim tra.* Khi bn in c mu sc khng ng, b mt nt, mt mu,... c th l do u in b nghtmc. Hy s dng chc nng in th mu v lm sch u phun c sn trong chngtrnh ca my trc khi c nhng bin php khc phc khc.* Cui cng, hy nh lm v sinh my nh k, thi gian ty thuc vo mi trng v mc s dng, c th l mi tun hoc mi thng. i vi ngi dng thng thng th lmv sinh my bng cch dng khn m v mm lau sch cc b phn bn ngoi, khayng giy, bnh cao su cun giy. Cng vic v sinh bn trong ch nn dnh cho nhngngi th chuyn nghip trnh nhng h hng ng tic do v sinh khng ng cch.

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