Sharp 20D2-G, Service Manual

Page: 2 / 45

2
2-1
2-2
20D2-S/G
21D1-S/G
21D2-S/G
SPECIFICA
TIONS
Con
v
ergence
.................................................................
Self Con
v
ergence System
F
ocus
.......................................................................
Quadra-
P
otential Electrostatic
Sweep Deflection
......................................................................................
Magnetic
Inter
mediate F
requencies
Picture IF Carrier
..................................................................................
38.9MHz
Sound IF Carr
ier F
requency
6.5MHz
..............................................................................................
32.4MHz
6.0MHz
..............................................................................................
32.9MHz
5.5MHz
..............................................................................................
33.4MHz
20D2-S/G, 21D2-S/G
..................................................
21D1-S/G
....................................................................
Colour Sub-Carrier
F
requency
............................................................
34.47MHz
P
o
w
e
r Input
.....................................................................
110 ~ 240V A
C
50/60 Hz
P
o
w
e
r Consumption
20D2-S/G, 21D2-S/
G
21D1-S/G 20D2-S/G
.....................................................................................................
72W
21D1-S/G
.....................................................................................................
75W
21D2-S/G
.....................................................................................................
79W
20D2-S/G
A
udio P
o
wer Output Ratin
g
...................................................................
5.0W(at Max.)
.....................................................................................
3.0W(at Max.)
Speak
er
Siz
e
5 x 9 cm Elliptic (2 pcs) 5 x 9 cm Elliptic (1 pcs)
V
o
ice Coil Impedance
...........................................................
16 ohms at 400 Hz
Aer
ial Input Impedance
VHF/UHF
..........................................................................
75 ohms Unbalanced
Receiving System
.............................................
P
AL-B/G,D/K,I SECAM-B/G,D/K,K1
T
uner Ranges
VHF-Channels
..........................................
E2(48.25MHz) th
ru
E12(224.25MHz)
C1(49.75MHz) thru C12(216.25 MHz)
S1(105.25MHz) th
ru
S36(423.25HMz)
UHF-Channels
......................................
E21(471.25MHz) thru E69(855.25MHz)
C13(471.25MHz) th
ru
C57(863.25MHz)
S37(431.25MHz) thru S41(463.25MHz)
Dimensions
..................................................................................
Width:
594.0mm
Height:
465.0mm
Depth:
478.0mm
W
e
ight(appro
x
):
18.0 kg
21D1-S/G
..................................................................................
Width:
499.0mm
Height:
478.0mm
Depth:
476.5mm
W
e
ight(appro
x
):
20.5 kg
21D2-S/G
..................................................................................
Width:
594.0mm
Height:
465.0mm
Depth:
473.0mm
W
e
ight(appro
x
):
21.0 kg
Cabinet mater
ial
....................................................................................
All Plastics
Specifications are subject to c
hang
e without prior notic
e
.
IMPOR
T
ANT SER
VICE NO
TES
Maintenance and repairing of this receiver should be done b
y
quali-
fied service 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
g
e
system,
remo
ve static c
h
ar
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
u
mber 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 goggles and after disc
har
ging
the high v
oltage 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
olonged e
xposure at c
lose range
, the f
o
llo
wing
precautions should be obser
ved:
1.
*
If there is a possibility that the high v
olta
g
e
fluctuates as a result of the repairing,
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 unauthorizer
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
o
llo
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
ks,
adjustment and compar
tment co
ver
s or shields,
isolation resistor
- ca-
pacity netw
orks,
mec
hanical insulator
s etc.
20D2-S/G :
When repairing the cir
cuit,
be sure not to increase the high v
olta
g
e
to more
than 27.6kV(at beam 0
µ
A) f
or the set.
2
.
20D2-S/G :
T
o
keep the set in a normal operation ,
be sure to make it function on
24.5kV
±
1.5kV(at beam 1100
µ
A) in the case of the set.
21D1-S/G,
21D2-S/G :
When repairing the cir
cuit,
be sure not to increase the high
v
olta
g
e
to more than 28.0kV(at beam 0
µ
A) f
or the set.
21D1-S/G,
21D2-S/G :
T
o
keep the set in a normal operation ,
be sure to make it function
on 24.8kV
±
1.5kV(at beam 1100
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
.