Sharp 21XF30, Service Manual

Page: 2 / 58

2
21XF30
21XF50
2-1
2-2
SPECIFICA
TIONS
Con
v
ergence
.................................................................
Self Con
v
ergence System
F
ocus
.......................................................................
Quadr
a-P
otential Electrostatic
Sw
eep Deflection
......................................................................................
Magnetic
Inter
mediate F
requencies
Picture IF Carr
ier
..................................................................................
38.9MHz
Sound IF Carr
ier F
requency
5.74MHz
..........................................................................................
33.16MHz
5.50MHz
..........................................................................................
33.40MHz
Colour Sub-Carr
ier F
requency
............................................................
34.47MHz
P
o
w
e
r Input
.....................................................................
110 ~ 240V A
C
50/60 Hz
P
o
w
er Consumption
............................................
111W(21XF30), 112W(21XF50)
A
udio P
o
w
er Output Rating
........................................................
7.5W x 2(at Max.)
Speak
er
Siz
e
............................................................................................
12 x 6 cm (2pc)
V
o
ice Coil Impedance
.............................................................
8 ohms at 400 Hz
Aer
ial Input Impedance
VHF/UHF
..........................................................................
75 ohms Unbalanced
Raceiving System
...........................................................................
CCIR/P
AL B
, G
T
uner Ranges
»
VHF-Channels
..................................................
48.25 MHz thr
u 463.25 MHz
»
UHF-Channels
...............................................
471.25 MHz thr
u 863.25 MHz
Dimensions
...................................................................................
Width: 621.0mm
Height: 468.0mm
Depth: 474.0mm
W
eight(appro
x):
25 kg
Cabinet mater
ial
....................................................................................
All Plastics
Specifications are subject to c
hang
e without prior notice
.
IMPOR
T
ANT SER
VICE NO
TES
Maintenance and repair of this receiver should be done b
y qualified
ser
vice per
sonnel onl
y.
SER
VICE OF HIGH
V
O
L
T
A
GE SYSTEM AND PIC-
TURE TUBE
When ser
vicing the high v
olta
ge system,
remo
ve static c
har
g
e
fr
om it b
y
Connecting a 10K ohm Resistor in series with an insulated wire(suc
h as a
test pr
obe) between picture tube da
g and 2nd anode lead.
(A
C line cor
d
should be disconnected fr
om A
C
outlet.)
1.
Picture tube in this receiver emplo
ys integral implosion pr
otection.
2.
Replace with tube of the same type n
umber f
or contin
ued saf
ety
.
3.
Do not lift picture tube b
y the nec
k.
4.
Handle the picture tube onl
y when wearing shatterpr
oof gog
gles and after disc
har
ging
the high v
olta
g
e
completel
y
.
X-RA
Y
This receiver is designed so that an
y X-Ra
y radiation is kept to an absolute
Minim
um.
Since cer
tain malfunctions or ser
vicing ma
y pr
oduce potentiall
y
hazar
dous radiation with pr
olong
ed e
x
posure at c
lose rang
e
, the f
o
llo
win
precautions should be obser
ved:
1
.
When repairing the cir
cuit,
be sure not to increase the high v
olta
g
e
to more than 30.0kV
(at beam 0
µ
A) f
or the set.
2
.
T
o
keep the set in a normal opear
tion ,
be sure to make it function on 27.5kV
±
1.5kV (at
beam 1,350
µ
A) in the case of the set.
The set has been factor
y - Adjusted to the abo
ve-
mentioned high v
olta
g
e
.
∴
If there is a possibility that the high v
olta
g
e
fluctuates as a result of the repair
s,
ne
ver f
o
rg
et to c
hec
k f
or suc
h high v
olta
g
e
after the w
ork.
3
.
Do not substitute a picture tube with unauthoriz
er
d types and/or brands whic
h ma
y
cause e
xcess X-ra
y radiation.
BEFORE RETURNING
THE RECEIVER
Bef
ore returning the receiver to the user
, perf
orm the f
ollo
wing saf
ety Chec
ks.
1.
Inspect all lead dress to make cer
tain that leads are not pinc
hed or that har
d
ware is not
lodg
ed between the c
hassis and other metal par
ts in the receiver
.
2
.
Inspect all pr
otective de
vices suc
h as non-metallic contr
ol knobs,
insulating fishpaper
s,
cabinet bac
k
s,
adjustment and compar
tment co
ver
s or shields,
isolation resistor
- ca-
pacity netw
orks,
mec
hanical insulator
s etc.