V42PD20ES
4
＜
＜＜
＜専用
専用専用
専用 PDP 対応＞
対応＞対応＞
対応＞02 -0 3-19, 中嶋
中嶋中嶋
中嶋
SAFETY PRECAUTIONS
1. The d esi gn of th is pr od uct con ta in s sp ecial har d wa re , ma ny
circuit s and components specially for safety purposes. For
con ti nu ed pr ot ecti on , n o chan g es sh ou ld b e ma de to the o rig i nal
d esi gn un less a uth or ized i n writi n g by th e ma nu fact ur er.
Rep lacem en t p ar ts m ust b e id ent ic al to thos e u sed i n th e or igin al
ci rcu it s. S er vi ce sho uld b e p er for m ed by qu al if i ed p ers on nel
on ly.
2. Al te r ation s of t he desi g n or ci rcui tr y of t he pr od ucts sh ould not be
made. Any design alterations or additions will void the
m anu fact ur er's w arr a nt y and w ill f ur th er r eli eve t he ma nu factu r er
of r esp onsi b ility for per so na l i njur y or p r op er ty d am ag e r esul t in g
th er efr om .
3. M an y e lectr ical an d m ech anica l p arts in th e pr od ucts ha ve
special safety-related characteristics. T hese characteristics are
oft en no t e vi den t f r om visua l insp ecti on n or ca n t he pr o tect io n
aff or de d by th em nece ssar il y b e ob tai n ed b y u sin g r ep lacem en t
com po ne nts ra ted f or hi g he r vo ltag e, w att ag e, etc. Rep lacem en t
p arts wh ic h ha ve th ese sp eci al s afet y ch ar act er ist ics ar e
identified in the parts list of Servic e manual. El ec tric al
components having su ch features ar e identified by shading
on the sche matic s and by (!
!!
!) on the parts list in Service
manual. The us e of a sub sti tu te r ep la cem en t whi ch do es n ot
h ave th e sam e saf ety ch ar act er ist ics as t he r eco mmen de d
r eplac em ent par t sh ow n i n th e p ar ts list of S er vice m an ual m ay
cause shock, fire, or other hazards .
4. Do n't shor t between the LIVE side ground and ISOL ATED
(NEUTRAL) side ground or EARTH side ground when
repairing.
Some model's power circuit is partly different in the GND. The
diff er enc e of th e G ND is sho wn b y th e LIV E : (") side GND, the
ISO LATE D(N EUTRAL) : ( #) side G ND and EARTH : ($) side
GN D. D o n't sh or t b et we en th e LIV E si d e GN D an d
ISO LATE D(NEUTRAL) side GND or EARTH sid e GND and
n ever m ea sur e w it h a m ea sur ing a ppa r atus ( oscillo scop e etc.)
th e LI VE si d e GN D an d IS OLA T ED(N E UTRAL ) sid e G ND or
EARTH side GND at the s ame time.
If above note will not be kept, a fuse or any parts will be broken.
5. If any repair has been made to the chassis, it is recommended
th at t he PDP volt age se tting sh ould be checked or a djust ed .
6. W hen se r vice i s r equ ir e d, ob ser ve th e or igi na l l ea d dr ess. E xtr a
pr ec aut i on sh ou ld b e g i ve n t o assure cor rect l ea d dr ess in th e
hig h voltag e ci rcui t a r ea. W her e a s hor t cir cuit h as occu rre d,
th ose co mp on ent s tha t indica te evide nce of ove r hea ti ng sho ul d
b e r e place d. A l wa ys u se th e ma nuf act ur er's r ep lacem en t
components.
7. Isolation Check
(Safety for Electrical Shock Hazard)
Af ter r e-ass emb lin g th e p rodu ct, al ways per f orm an isol at io n
ch eck on the expo sed me tal p ar ts of t he cabi n et ( a nte nn a
ter m ina ls, vid eo /au di o inpu t and ou tpu t t er mi n als, Con tr ol kn obs,
m etal cabin et, scr ewhe ad s, ea r ph one j ack, con tr ol shaf ts, etc.)
to be su re th e p r odu ct i s s af e t o o pe r ate wi th ou t d an ger of
elect rical shoc k.
(1) Dielectric Strength Test
The i so l ati on be tween the A C pr im a ry circu i t an d al l me tal p ar ts
exp ose d t o th e us er , p ar ticul arly an y e xp os ed met al p art h avi ng a
r etu rn p ath to t he chass is sho ul d wi ths tan d a vol t age of 1 50 0V
AC (r.m.s.) for a period of one second.
This method of test requires a t est equipment not generally found
in t he ser vic e trad e.
(2) Leakage Current Check
Pl ug th e A C lin e c ord d ir ect l y in to th e A C ou tl et ( d o n ot use a li n e
isol atio n tr ansf or mer du r in g thi s ch eck.) . U si n g a " Lea kag e
Cur rent Teste r", me asur e th e l ea kag e cu rr e nt f rom each exp osed
m etal p ar t of the ca bine t, p art icu l arl y any e xpos ed me tal p ar t
h aving a re tur n path to t he ch assis , t o a kn own go od ea rt h
gr ou nd (wa ter pi p e, e tc.) . An y l eaka ge cur ren t m ust n ot e xceed
3.5mA AC (r.m.s.).
Howeve r, i n tr op ic al ar ea , th is mu st no t exce ed 0.2 mA AC
(r.m.s.).
"
""
"Alte rnat e Che ck M ethod
Pl ug th e A C lin e c ord d ir ect l y in to th e A C ou tl et ( d o n ot use a li n e
isol atio n tr an sfor m er dur ing t hi s che ck.) . Use an AC vo lt me ter
having 1000
Ω / V or more sensitivity in the following manner.
Con nect a 1 500 Ω10W resistor paralleled by a 0.15µF AC-type
cap acitor b etw e en an e xpos ed me ta l p ar t a nd a kn own g oo d
ea rt h gr o und ( wa ter p ipe, etc.) . M eas ur e t he AC vol ta ge acr oss
the resistor with the AC voltmeter. Move the resistor connection
to e ach e xpos ed met al pa rt, par ti cu l arl y an y exp ose d m eta l p ar t
h avi ng a r e tur n pa th to th e ch assi s, an d me asur e th e AC vo lt ag e
across t he res is tor . Now, re verse the plug in the AC o utlet an d
r epe at each m easu re ment . A ny vol ta ge m easu r ed m us t n ot
exce ed 0 .7 5V A C (r.m. s.) . Thi s cor r esp on ds to 3.5 mA AC
(r.m.s.).
However, in tropical are a, this must not exce ed 0.3V AC ( r.m. s.).
This corresponds to 0.2mA AC (r.m.s.).
0.15
