Casio TV-1450C User manual

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
nnn
nro
rn
rn
nnn
nnnnnannn
a
mir
2
Circuit
Operations
----------------------------nnnennnnn
nnn
nnn
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
nnnn
nnn
nnn
nnn
nnn
nnn
nmnnnnn
nnn
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
nnn
nnn
nnn
nnn
nnn
nnn
nme
25
Mechanical
Parts
List
---------------~------------------
nnn
nn
nn
nnn
nnn
nn
nnn
ne
nnn
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