No.52026

A

V-14F3/AV-1435

A

V-1435EE/AV-1435TEE

A

V-14FMT3/AV-1438

A

V-14FMG3/AV-14FMG3

B

3

SAFETY PRECAUTIONS
1. The design of this pr oduct conta ins speci al hardware, ma ny
circuits and components specially for safety purposes. For
continu ed pr otec tion , no chang es sh ould be made to the ori ginal
design un less auth orized in writing by the manu facturer .
Replac emen t par ts must be id ent ical t o thos e us ed in t he ori gin al
circuit s. Service sho uld be performed by qualified p ersonnel
only.
2. Alter ation s of t he desi gn or circ uitr y of the prod ucts s hould not be
made. Any design alterations or additions will void the
manufact urer 's warra nty and wi ll fur ther rel ieve t he ma nufac tur er
of respons ibili ty for pers onal inj ury or prop erty dam age result ing
therefr om .
3. Many electr ical and mech anical parts i n the products have
special safety-related characteristics. These characteristics are
often no t evi dent fr om visua l insp ection nor ca n the pr otect ion
afforde d by them necessar ily be ob tained b y using rep lacemen t
compone nts rated for highe r voltage, w attage, et c. Repl acement
parts wh ich ha ve these speci al safet y char acterist ics ar e
identified i n the parts list of Servic e manual. Elec tri c al
components having such features are identified by shading
on the sche matics and by (!
!!
!) on the parts list in Service
manual. The use of a sub stitute rep lacement w hich does n ot
have th e same saf ety character istics as t he recommende d
replac ement par t shown i n the par ts list of Service m anual may
cause shock, fire, or other hazards.
4. Don't short between the LIVE side ground and ISOLATED
(NEUTRAL) side ground or EARTH side ground when
repairing.
Some model's power circuit is partly different in the GND. The
differ ence of th e GND is shown by th e LI VE : (") side GND, the
ISOLATE D(NEUTRAL) : (#) side GND and EARTH : ( $) side
GND. Do n't sh ort bet ween th e LIVE s ide GN D and
ISOLATE D(NEUTR AL) side GND or EARTH s ide GND an d
never m easure with a measur ing a pparatus (oscil loscop e etc.)
the LIV E side GND an d ISOLAT ED(NEUTRAL ) side GND or
EARTH side GN D at th e same tim e.
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
that t he B1 sett ing shou ld be ch ecked or adj usted ( See
ADJUSTM ENT OF B 1 POWE R SUPPL Y).
6. T he high v oltage applied t o the pic ture tu be must c onform with
that sp ecified i n Service m anual. Exc essive high voltage ca n
cause an increase i n X-Ray emissi on, arcing an d possible
component damage, therefore operation under excessive high
voltage conditions should be kept to a minimum, or should be
prevent ed. If s evere arcing occurs, rem ove the AC power
immedi ately and de termine t he cause b y visual i nspect ion
(incor rect install ation, crac ked or melte d high voltage harness,
poor so ldering, etc.) . To m aintain the p roper mi nimum l evel of
soft X-Ray emission, c omponent s in the high voltage cir cuitry
includ ing the pict ure tube must be the exac t replacem ents or
altern atives approv ed by the ma nufacturer of the compl ete
product.
7. Do not c hec k high volt age b y draw ing an ar c. Use a hi gh v oltag e
meter or a high v oltage probe wit h a VTVM . Discharg e the
picture tube before attempting meter connection, by connecting
a clip lead to the gr ound fra me and conn ecting t he other end of
the lead through a 10kΩ 2W resist or to the anod e button.
8. W hen servic e is requ ired, ob serve the or igina l lead dress . Extra
precaut ion sh ould be g iven t o assure correc t lead dress in the
high vol tage circui t area. W here a short c ircuit h as occurre d,
those co mponent s that i ndicate evidenc e of over heating should
be replac ed. Al ways use th e manufact urer's r eplacem ent
components.
9. Isolation Check
(Safety for Electrical Shock Hazard)
After re- assembling th e produ ct, always perf orm an isolation
check on the exposed me tal parts of t he cabinet (a ntenna
termina ls, video /audi o i nput and ou tput t ermi nals , Con trol k nobs,
metal cabinet, screw heads, ea rphone jack, control shafts, etc.)
to be s ure the p roduct is s afe to o perate wi thout dan ger of
electri cal shoc k.
(1) Dielectric Strength Test
The iso lation be tween the AC prima ry circu it and al l metal p arts
expose d to th e us er, p artic ularl y an y expos ed metal part havi ng a
return path to t he chass is sho uld wit hstand a volt age of 3 000V
AC (r.m.s.) for a period of one second.
(. . . . W ithstand a v oltag e of 1100V AC (r.m.s .) to an ap plianc e
rated up to 120V , and 3 000V AC ( r.m.s .) to an applian ce rat ed
200V or more, for a period of one second.)
This method of test r equires a t est equi pment not g enerally found
in the serv ice tr ade.
(2) Leakage Current Check
Plug th e AC line c ord d irect ly into the A C ou tlet (d o not use a lin e
isolati on transf ormer dur ing this c heck.). Using a "Lea kage
Current Test er", meas ure t he lea kag e curr ent f rom each ex posed
metal p art of the c abinet, p articularl y any expos ed metal par t
having a re turn path to the ch assis, to a known go od earth
ground (water pi pe, etc .). Any leakage curren t must not exceed
0.5mA AC (r.m.s.).
Howeve r, in tropic al area, this must no t exceed 0.2mA AC
(r.m.s.).
"
""
" Altern ate Ch eck Method
Plug th e AC line c ord d irect ly into the A C ou tlet (d o not use a lin e
isolati on transfor mer during this check .). Use an AC vo ltmeter
having 1 000 ohms per v olt or more sens itivity i n the followi ng
manner . Connec t a 1500Ω 10W resist or para lleled b y a 0.1 5µF
AC-type capacit or betwe en an expo sed met al part and a known
good ear th ground ( water pipe, etc .). Measur e the AC voltag e
across th e resist or with the AC vol tmeter. Move th e resistor
connec tion to each ex posed me tal part, particul arly any ex posed
metal p art havin g a return path to the chassis , and measu re the
AC voltag e acros s the res istor. No w, rever se the plu g in the AC
outlet and repe at each measuremen t. Any voltage me asured
must not e xceed 0.7 5V AC (r.m.s.) . This c orresponds to 0.5m A
AC (r.m.s.).
However, in tropica l area, this must not exceed 0.3V AC (r.m.s.).
This corresponds to 0.2mA AC (r.m.s.).
0.15μF AC-TYPE
1500 Ω 10W
GOOD EARTH GROUND
PLACE THIS PROBE
ON E A CH EX PO SE D
MET AL PA RT
AC VOLTMETER
(HAVING 1000 Ω/V,
OR MORE SENSITIVITY)