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  9. Casio TV-1450C User manual

Casio TV-1450C User manual

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Seavice
MANUAL
&
PARTS
LIST
soo
POCKET
TELEVISION
TV=-1450C
TV=-1450N
TV=-1450D
MAY
1991
Page
Specifications
---------------------------------2-ecn
cc
nnnn
nnn
nnnn
ncn
cn
nnn
nccn
ne
nananncnnnnncncencnns
|
Block
DiaQram
--------------en20n=--nnnn
nnn
nnn
nn
nnn
nnn
nnn
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nro
rn
rn
nnn
nnnnnannn
a
mir
2
Circuit
Operations
----------------------------nnnennnnn
nnn
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nner
nen
nnnn
enon
nnn
onnonmnnnnnnnnnn
sane
3
Adjustment
ee
a
Oo
a
a
5
Linear
PCB
------------------n2-n-n-nn-nennnnnnn
ence
nc
cenceneennnnncnnnnnnennnnnnencesccsenen
&
AID
PCB
~----------n--n-nnnnn
nnn
manne
nnn
n
nner
nner
nennncnnnccnncncnnncenanmmnnnnnnanans
10
Troubleshooting
------------------n-nn-n
nmr
nnn
nnn
nn
nner
nnn
nnn
nnn
nen
mn
nna
nnn
cn
emnnmnnnnns
12
Wiring
Diagram
-----------------------------n
enn
nnnn
nn
nn
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nmnnnnn
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nnnn
on
17
PCB
Diagrams
----------------7--------nn
nn
nnnnn
none
nn
enn
nnnnnnnncennnnnnnnnnnnnrnnannnnnannnnenes
18
Exploded
View:/
Disassembly
==--<-s--2-+---=-sse
retire
mene
seen
eerce
ese
areeeen
eee
24
Electrical
Parts
List
-----------------------------
ns
-nn
nnn
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nme
25
Mechanical
Parts
List
---------------~------------------
nnn
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ne
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er
een
cnn
nnn
34
Lead
Identification
------------------------------------e---o2ncenecenccenceencees
eid
ceoeee
se
35
Schematic
Diagram
+S
37
SPECIFICATIONS
Specification
TV-1450C
:
VHF
2~12ch
UHF
:
21
~
69ch
TV-1450N
:
VHF
2~12ch
UHF
:
21
~
69ch
TV-1450D
:
VHF
—
UHF
:
21
~
68ch
2.
Power
voltage
DC
6.0V
3.
Power
consumption
Approx.
3.8
W
4.
Current
consumption
Approx.
630
mA
‘|
5.
Battery
life
(with
alkaline
batteries)
Approx.
2.0
hours
6.
Power
supply
7.
Connection
terminals
1.
Reception
channels
Batteries:
4AA
size
batteries
Car
adaptor:
CA-K65
AC
adaptor:
AD-K65
Earphone
jack:
3.56
mini
External
power
jack:
6.0V
DC
IN
External
antenna
jack:
3.5@
mini
Audio/Video
jack:
3.58
9.
No.
of
picture
element
118,580
(220
x
539)
dots
:
11.
Weight
12.
Standard
accessories
Soft
case,
Ear
phone
and
Test
batteries
(R6
x
4)
TV-1450C,TV-1450D
TV-1450N
140
mm
(H)
x
87mm
(W)
x
37
mm
(D)
5-1/4"
(H)
x
3-1/2"
(W)
x
1-1/2"
(D)
300g
excepting
batteries
10.6
oz
excepting
batteries
AC
adaptor:
AD-K65
AD-K65
13.
Options
Car
adaptor:
CA-K65
CA-K65
RF
connector:
CF-13
—
Antenna
matching
device:
AS-35S
—
14.
Body
clolor
BLOCK
DIAGRAM
Antenna
@
Ic200
Video
Sound
}
Det.
FM
AFT
Circuit
AGC
Circuit
Speaker
@
TU
Volume
Control
@
10400
Tuning
Voltage
Generator
®
1C300
Chroma
.
Circuit
©
D
Driver
tt
Driver
OSC
Display
Control
A/D
Converter
Auto-tuning
Control
1C800,1C801
Display
Voltage.
Generator
Power
VCC2
(4.3V)
VR800
-
Supply
—
VCC7
(45V)
bg
—
VEEN
Brightness
Control
@)
—
Color
Tuner
TU
TEPE5-01(TV-1450C,
TV-1450N),
TEPB5-02(TV-1450D)
Selects
a
desired
radio
wave,
and
changes
it
to
the
video
IF
signal.
(2)
-
Video
IF
Amp.
Q200
28C4238
Amplifies
the
video
IF
signal
output
from
the
tuner
TU
by
10
times
(20dB).
()-
Video,
Sound,
FM,
AFT
Det.,
AGC
1C200
M51348FP
Eliminates
the
carrier
wave
in
the
video
IF
signal,
and
picks
up
the
video
signal
and
the
sound
IF
signal.
Also
the
sound
signal
is
picked
up
from
the
sound
IF
signal
by
FM
detection.
(4)
-
Audio
Amp.
IC600
TA7368F
Sound
amplification.
()
-
Chroma
Circuit
1C300
M51403FP
Generates
the
tricolor
of
red,
green
and
blue
from
the
video
signal.
(@)-
OSC,
A/D
Converter
IC700
MSM6348GS-K
Converts
the
color
signal
into
digital
signal.
Also
generates
the
clock
pulse
for
the
display,
and
controls
the
display.
@)
—
Tuning
Voltage
Generator
IC400
MSC1169MS-K
Generates
the
tuning
voltage
from
the
tuning
pulse
(TU)
output
of
6).
(8)
—
Display
Voltage
Generator
|C800
BA10358F,
IC801
MSM6362MS-K
Generates
the
display
voltages
VO
~
V4
from
VEE1
and
VCC7
outputs
of
the
power
supply.
CIRCUIT
OPERATIONS
Tuning
Voltage
Generator
=
S49
”
2
3
3
<
Es
TV-1450C,
TV-1450N
TV-1450D
Fig.
1
This
circuit
generates
the
DC
tuning
voltage
BT
for
selecting
a
channel
from
TU
pulse
being
output
from
iC700.
iC400
has
3
circuits
for
converting
pulses
to
voltages,
selects
one
of
VHF-L,
VHF-H
or
UHF,
and
causes
the
tuning
voltage
to
be
output
from
the
TUO
terminal
(pin
no.12).
Fig.
2
and
Table
1
show
the
conditions
for
selection.
a
Function
Table
—
1
BEG
Power
supply
TIOO
LCI2U-I7
Wee
eee
ee
OC
IN6V
Fig.
3
The
power
supply
consists
of
DC-DC
converter,
and
causes
the
voltages
to
be
output
as
shown
in
Table
2.
a
Table
-—
2
ADJUSTMENT
SUB
PCB
1)
Items
to
be
adjusted:
Measuring
Instrument
Voltmeter
2)
Adjustment
and
Test
Point
Locations
(TOP
VIEW)
L-CONECT
C620
OO
TP1
T100
FU
PHONE
JACK
|
TR-CONECT
gai
c110_Lb
VR300
DB
¢-)
382
SUB-B
3)
Equipment
connection
/
Procedure
Vcc2
voltage
setting
Voltmeter
Adjust
for
Input
Output
Output
Connection
Connection
|
Point
See
:
aad
Adjust
for
4.3
+
0.02V
reading
on
voltmeter.
Linear
PCB
1)
Items
to
be
adjusted:
Video
detection
coil
adj.
TV
signal
generator,
Pattern
generator,
Oscilloscope,
Low-pass
filter
AFT
coil
adjustment
Sweep
generator,
Oscilloscope,
Voltmeter
AGC
adjustment
TV
signal
generator,
Pattern
generator,
IF
levelmeter
2)
Adjustment
and
Test
Point
Locations
(TOP
VIEW)
Contrast
adjustment
TV
signal
generator,
Pattern
generator,
Oscilloscope
(BOTTOM
VIEW)
3)
Equipment
connection
/
Procedure
*
Open
solering
pad
A.
Pattern
generator
Video
detection
coil
adjustment
Signal
generator
ee
sce
|
ea
|
Se
|
Aen
Connection
°
Pattern
generator
Signal
generator
*
Open
soldering
pad
A.
Sweep
generator
Low-pass
filter
Color
bar
38.9MHz(TV-
1450C,N)
T200
39.5MHz(TV-
Oscilloscope
1450
43+.
AFT
coil
adjustment
Oscilloscope
38.9+5MHz(Sweep)
39.5+5MHz(Sweep)
Marker:38.9(TV1450C,N)
Marker:39.5(TV-1450D)
70dBu
*
Open
soldering
pad
A,
Pattern
generator
Pattern
generator
:TV-1450C,N
Voltmeter
:‘TV-1450D}
T2094
Oscilloscope
Contrast
adjustment
and
grand
pad
B.
Signal
generator
Color
bar
38.9MHz
(TV-1450C,N)
39.5MHz
signal
generator
(TV.
14800)
OdBu
Oscilloscope
Low-pass
fitter
Adjust
for
DC
level
at
minimum.
Voltmeter
Adjust
for
1.8
+
0.2V
reading
on
voltmeter.
Confirm
that
the
marker
is
at
the
middie
of
S-curve
on
oscillo-
scope.
Oscilloscope
Adjust
step
form
wave
to
read
0.8
+
0.05
Vp-p.
AGC
adjustment
Pattern
Signal
generator
generator
IF
levelmeter
Output
Output
*
Connection
{Point
Pattern
generator
Color
bar
Pads
Make
adjustment
according
to
65+5dBu
|
A/B/C
|
IF
levelmeter
TP2
|
the
next
table
with
reading
the
TV
signal
IF
levelmeter.
generator
Pads
to
be
short-circuited.
ThE
a
eer
ee
se
i
No
Pad
shorting
required.
If
short-circuiting
of
pads
B
or
C
does
not
set
the
IF
levelmeter
within
81
~
87
dBu