Daewoo CN-150 User manual

3
CONTROL VIEW
F-CONNECTOR
300 OHM-75 OHM
COUPLING
TRANSFORMER
VHF
75
FROM 75 OHM
VHF ANTENNA WITH
CABLE OR CABLE
TV SYSTEM
REMOCON SENSOR
ENTER
POWER ON/OFF
MENU
CH UP/DN
VOL UP/DN

1. X-RAY RADIATION PRECAUTION
1) Excessive high voltage can produce potentially
hazardous X-RAY RADIATION. To avoid such
hazards, the high voltage must not be above the
specified limit. The nominal value of the high voltage
of this receiver is 24.4kv(28.6kv) at zero beam current
(minimum brightness) under a 120V AC power source.
The high voltage must not, under any circumstances,
exceed 25kv (29kv). Each time a receiver requires
servicing, the high voltage should be checked following
the HIGH VOLTAGE CHECK procedure on page 7 of
this manual. It is recommended as a parts of the
service record. It is important to use an accurate and
reliable high voltage meter.
2)This receiver is equipped with X-RADIATION
PROTECTION circuit which prevents the receiver from
producing an excessively high voltage even if the
B+voltage increases abnormally. Each time the
receiver is serviced, X-RADIATION PROTECTION
circuit must be checked to determine that the circuit is
properly functioning, following the X-RADIATION
PROTECTION CIRCUIT CHECK procedure on page 7
of this manual.
3) The only source of X-RAY RADIATION in this TV
receiver is the picture tube. For continued X-RAY
RADIATION protection, the replacement tube must be
exactly the same type tube as specified in the parts list.
4) Some parts in this receiver have special safety-related
characteristics for X-RAY RADIATION protection. For
continued safety, parts replacement should be
undertaken only after referring to the PRODUCT
SAFETY NOTICE below.
2. SAFETY PRECAUTION
WARNING: Service should not be attempted by anyone
unfamiliar with the necessary precautions on this receiver.
The following are the necessary precautions to be
observed before servicing.
1) Since the chassis of this receiver has hazardous
potential to ground whenever the receiver is plugged in
(floating chassis), an isolation transformer must be
used during servicing to avoid shock hazard.
2) Always discharge the picture tube anode to the CRT
conductive coating before handling the picture tube.
The picture tube is highly evacuated and if broken,
glass fragments will be violently expelled. Use
shatterproof goggles and keep picture tube away from
the body while handling.
3) When placing a chassis in the cabinet, always be
certain that all the protective devices are put back in
place, such as; non-metallic control knobs, insulating
covers, shields, isolation resistor-capacitor network,
etc.
4) Before returning the set to the customer, always
perform an AC leakage current check to the exposed
metallic parts of the cabinet, such as antennas,
terminals, screwheads, metal overlays, control shafts
etc. to be sure the set is safe to operate without
danger of electrical shock.
Plug the AC line cord directly into a 120V AC outlet (do
not use a line isola-tion transformer during this check).
Use an AC voltmeter having 5000 ohms per volt or
more sensitivity in the following manner.
Connect at 1500 ohm 10 watt resistor, paralleled by a
0.15µF. AC type capacitor, between a known good
earth ground (water pipe, conduit etc.) and the
exposed metallic parts, one at a time. Measure the AC
voltage across the combination of 1500 ohm resistor
and 0.15µF capacitor. Voltage measured must not
exceed 0.3 volts RMS. This corresponds to 0.2
milliamp. AC. Any value exceeding this limit constitutes
a potential shock hazard and must be corrected
immediately.
3. PRODUCT SAFETY NOTICE
Many electrical and mechanical parts in this chassis have
special safety-related characteristics. These
characteristics are often passed unnoticed by a visual
inspection and the protection afforded by them cannot
necessarily be obtained by using replacement
components rated for higher voltage, wattage, etc.
Replacement parts which have these special safety
characteristics are identified in this manual and its
supplements; electrical components having such features
are identified by shading on the schematic diagram and
the parts list.
Before replacing any of these components, read the parts
list in this manual carefully. The use of substitute
replacement parts which do not have the same safety
characteristics as specified in the parts list may create X-
ray radiation or other hazards.
4. SERVICE NOTES
1) When replacing parts or circuit boards, clamp or bend
the lead wires to terminals before soldering.
2) When replacing a high wattage resistor (metal oxide
film resistor) in the circuit board, keep the resistor min
1/2 inch away from circuit board.
3) Keep wires away from high voltage or high
temperature components.
* Minimum brightness
4
IMPORTANT SERVICE NOTES
AC VOLT METER
Good earth ground
such as a water
pipe, conduit, etc.
Place this probe
on each exposed
metalic part.
0.15µF
1500 ohm
10watt
*

- 5 -
BLOCK DIAGRAM

7
1. GENERAL
In the majority of cases, all color televisions will need only
slight touch-up adjustment upon installation. Check the
basic characteristics such as height, focus and sub-
bright. Observe the picture for good black and white
details without objectionable color shading. If color
shading is evident, demagentize the receiver. If color
shading still persists, perform purity and convergence
adjustments. This should be all that is necessary to
achieve Optimum receiver performance.
2. VERTICAL HEIGHT ADJUSTMENT
1) Tune in an active channel.
2) Adjust brightness and contrast controls for a good
picture.
3) Adjust vertical height control (R315) for approximately
one half inch over scan at top and bottom of picture
screen.
4) Vertical centering adjustment VR316
Horizontal centering adjustment VR556.
3. FOCUS ADJUSTMENT
1) Tune in an active channel.
2) Adjust brightness, sharpness and contrast controls for a
good picture.
3) Adjust focus control (part of T402) for sharp scanning
lines and/or sharp picture.
4. RF AGC ADJUSTMENT
1) Tune in an active channel.
2) Using the attenuator, apply the signal of 60dBm to the
antenna input terminal.
3) Turn RF AGC control (VR555) full clockwise until snow
or/and noise appears in the picture, then slowly turn
control counterclockwise until snow or/and noise
disappears.
5. HIGH VOLTAGE CHECK
High voltage is not adjustable but must be checked to
verify that the receiver is operating within safe and
efficient design limitations as specified:
1) Operate Receiver for at least 15 minutes at 120V AC
line.
2) Set brightness sharpness, contrast and color control to
minumum position (Zero beam).
3) Connect accurate high voltage meter to CRT anode.
The reading should be 24.4kv(28.6kv)
If a correct reading cannot be obtained, check circuitry for
malfunctioning components.
6. X-RADIATION PROTECTION CIRCUIT TEST
When service has been performed on the horizontal
deflection system, high voltage system or B+ system, the
X-RADIATION protection circuit must be tested for proper
operation as follows:
1) Operate receiver for at least 15 minutes at 120V AC
line.
2) Adjust all customer controls for normal picture and
sound.
3) Check the voltage of D401 cathode. It's voltage
should be about 22V DC.
4) Connect the cathode of diode D302 and D401 through
a 2.7K ohm, 1/4W Resistor(R313).
5) To start operation, remove the resistor and touch the
cathode of D401 to chassis ground with a short clip
lead (Remove short clip lead as soon as the set
operates again with normal picture).
6) If the operation of horizontal osc. does not stop in step
The circuit must be repaired, before the set is returned
to the customer.
7. CRT GRAY SCALE ADJUSTMENT
1) Tune in an active channel.
2) Set the COLOR control to minimum.
3) Turn the SCREEN control (on T402 fully counter-
clockwise.)
4) Rotate the RED, GREEN and BLUE BIAS controls
(R971, R972, R973) counterclock wise from the
maximum, set them to the position where notches in
the knobs become parallel to the surface of P.C.
Board.
5) Set the GREEN and BLUE DRIVE controls (R975,
R974) to the mid position.
6) Turn the service switch SW20 (Service Position) on
the CRT board.
7) Rotate the SCREEN control (on T402) gradually
clockwise until the second horizontal line following the
first line appears slightly on the screen. Then turn fully
counterclockwise the two BIAS controls corresponding
to the colors of the first and the second horizontal
lines to eliminated the lines.
8) Set the SCREEN control to the position where the
third horizontal line lights slightly on the screen.
9) Adjust the two BIAS control set to the minimum in item
7) above to obtain the slightly lighted horizontal line in
the same levels of three (red, green, blue) colors. (The
line should be white if the BIAS controls are adjusted
properly.)
10) Turn the service switch SW20 again (Normal position
on the CRT board.)
11) Press PICTURE-SEL, P-UP and set the brightness
and contrast controls to the maximum.
12) Adjust the BLUE and GREEN DRIVE control to obtain
proper white-blanced picture in high light areas.
13) Using P-SEL, P-DN key, set the brightness and
contrast controls to obtain dark gray raster. Then
check the white balance in low brightness. If the white
balance is not proper, retouch the BIAS controls and
DRIVE controls to obtain a good white balance in both
low and high light areas.
GENERAL ADJUSTMENTS
(DTQ-14 ----- : 22.6kv ~ 24.6kv)
DTQ-20 ----- : 26.1kv ~ 28.8kv

8
8. SUB-BRIGHTNESS ADJUSTMENT
1) Tune in a color program.
2) Set the CONTRAST control to maximum and the BRI-
GHTNESS control to maximum and the SHARPNESS
control to the center position.
3) Set the COLOR and TINT controls to center.
4) Set the SUB-BRIGHT control R554 to center and leave
the receiver on five minutes in this state.
5) Watching the picture carefully, adjust the SUB-BRIGHT
control in the position where the picture does not show
evidence of blooming in high brightness area and not
appear too dark in low bright area.
6) Check for BRIGHTNESS controls at both extremes.
7)If the picture does not appear dark with the
CONTRAST and BRIGHTNESS control turned to
minimum, or not appear bright with the controls turned
to maximum, adjust the SUB-BRIGHT control again for
an acceptable picture.
9.CONVERGENCE MAGNET ASSEMBLY
POSITIONING
If Convergence magnet assembly and rubber wedges
need mechanical positioning follow figure 2.
9-1. COLOR PURITY ADJUSTMENT
NOTE : Before attempting any purity adjustments, the
receiver should be operated for at least 15
minutes.
1) Demagnetize the picture tube with a degaussing coil.
2) Adjust the CONTRAST and BRIGHTNESS controls to
maximum
3) Adjust RED and BLUE Bias controls (R971 and R973)
to provide only a green raster. Adjust the GREEN BIAS
control (R972) if necessary.
4) Loosen the clamp screw holding the yoke, and slide
the yoke backward to provide vertical green
belt(zone)in the picture screen.
5) Remove the Rubber Wedges.
6) Rotate and spread the tabs of the purity magnet (See
figure 2) around the neck of the picture tube until the
green belt is in the center of the screen. At the same
time, center the raster vertically.
7) Move the yoke slowly forward until a uniform green
screen is obtained. Tighten the clamp screw of the
yoke temporarily.
8) Check the purity of the red and blue raster by adjusting
the BIAS controls.
9) Obtain a white raster, referring to CRT GRAY SCALE
ADJUSTMENT .
10) Proceed with covergence adjustment.
DEFLECTION
YOKE
CONVERGENCE
MAGNET ASS'Y
TEMPORARY
MOUNTING RUBBER
WEDGES
DEF.
YOKE
ADHESIVE
{
GLASS CLOTH
TAPE
Fig. 2 Rubber Wedges Location
PICTURE TUBE
RUBBER
WEDGES
30 30
30

9
9-2. CONVERGENCE ADJUSTMENTS
NOTE : Before attempting any purity adjustments, the
receiver should be operated for at least 15
minutes.
A. CENTER CONVERGENCE ADJUSTMENT
1) Receive crosshatch pattern with a crosshatch signal
generator.
2) Adjust the BRIGHTNESS and CONTRAST Controls for
a good picture.
3) Adjust two tabs of the 4-Pole Magnets to change the
angle between them (See Fig. 3) and superimpose red
and blue vertical lines in the center area of the picture
screen. (See Fig. 4)
4) Turn both tabs at the same time keeping their angles
constant to superimpose red and blue horizontal lines
at the center of the screen. (See Fig. 4)
5) Adjust two tabs of 6-Pole Magnets to superimpose
red/blue line with green on top of each other. Adjusting
the angle affects the vertical lines and rotating both
magnets affects the horizontal lines.
6) Repeat adjustments 3), 4), 5) keeping in mind red,
green and blue movement, because 4-Pole Magnets
and 6-Pole Magnets interact and make dot movement
complex.
B. CIRCUMFERENCE CONVERGENCE ADJUSTMENT
NOTE : This adjustment requires Rubber Wedge Kit.
1) Loosen the clamping screw on deflection yoke to allow
the yoke to tilt.
2) Place a wedge as shown in figure 2 temporarily. (Do
not remove cover paper on adhesive part of the
wedge.)
3) Tilt front of the deflection yoke up or down to obtain
better convergence in circumference. (See Fig. 4) Push
the mounting wedge into the space between picture
and the yoke to hold the yoke temporarily.
4) Place other wedge into bottom space and remove the
cover paper to stick.
5) Tilt front of the yoke right or left to obtain better
convergence in cicumference. (See Fig. 4)
6) Hold the yoke position and put another wedge in either
upper space. Remove cover paper and stick the wedge
on picture tube to hold the yoke.
7) Detach the temporarily mounted wedge and put it in
another upper space. Stick it on picture tube to fix the
yoke.
8)After placing three wedges, re-check overall
convergence. Tighten the screw firmly to hold the yoke
tightly in place.
9) Stick 3 adhesive tapes on wedges as shown in figur3,2.
BLUE
BLUE
4-Pole Magnets Movement 6-Pole Magnets Movement Incline the Yoke up(or down) Incline the Yoke right(or left)
Center Convergence by Convergence Magnets Circumference Convergence by DEF. Yoke
RED
RED
RED/BLUE
RED/BLUE
GRN
GRN
B G R
BGR R
G
B
B
G
R
R G B
R
G
B
B
G
R
BGR
CONVERGENCE MAGNET ASSEMBLY
PURITY
MAGNETS
4-POLE
MAGNETS
6-POLE
MAGNETS
ADJUST THE
ANGLE
(VERTICAL
LINES)
CONSTANT
Fig. 3
Fig. 4 Dot Movement Pattern
ROTATE TWO TABS AT
THE SAME TIME
(HORIZONTAL LINES)
ADJUSTMENT OF MAGNET

10
10. PICTURE IF/AFT ADJUSTMENTS
NOTE : THIS RECEIVER IS TRANSISTORIZED AND SPECIAL CARE MUST BE TAKEN WHEN SERVICING. READ
THE FOLLOWING (NOTES BEFORE ATTEMPTING ALIGNMENT)
Alignment requires an exacting procedure and should be undertaken only when necessary.
Isolation transformer must be used to prevent shock hazard.
The test equipment specified or its equivalent is required to perform the alignment properly. Use of equipment which
does not meet these requirements may result in improper alignment.
Accurate equipment is essential to obtain proper alignment of this receiver.
Use of excessive signal from a sweep generator can cause overloading of receiver circuit Overloading should be
avoided to obtain a true response curve. Insertion of markers from the marker generator should not cause distortion of
the response curve.
The AC Power line voltage should be kept 120 volts while alignment is being performed.
Do not attempt to disconnect any components while the receiver is in operation.
Make sure the power cord is disconnected before replacing any parts in the receiver.
TEST EQUIPMENT
Digital voltmeter National Model VP-2600A or equivalent
Oscilloscope Tektronix Model 2215A or equivalent.
Direct/Low-capacity probe Tektronix Model P6120 or equivalent
(Accessory of oscilloscope)
Color-Bar/Dot/Crosshatch generator Tektronix Model 146 or equivalent.
PIF sweep marker generator Nihon Tsushinki Model 4723 or equivalent
Power supply Academy Model 150A or equivalent
Isolation transformer Voltage adjustable type having capacity of
at least 150 watts
BLOCK DIAGRAM
1) Disconnect the TUNER IF output from TP1 and connect equipment as shown above.
2) Set the sweep/marker generator for 30 Vrms.
3) Observe 1 Vp-p on scope by adjusting power supply B (4~5V).
4) Adjust PIF coil L505 for according beat signal with 45.75 MHz marker on scope (See Fig. 6).
5) Connect the DET IN to TP6.
6) Adjust AFT coil L504 for center display at 45.75 MHz on scope (See Fig. 7).
7) After completing the above steps, disconnect equipment and adjust the AGC delay circuit as explained in the General
Adjustments section of this manual.
B+
AGC
VH
DET IN OUT
TP3
MAIN BOARD
PIF SWEEP/MARKER GEN.
TP6
TP1
TP4
TP5 X
OSCILLOSCOPE
Y
45.75MHz
45.75MHz
BIAS
POWER
SUPPLY
A
(16.5V)
BIAS
POWER
SUPPLY
B
(4-5V)
P
Fig. 6 PIF Response
Fig. 7 AFT Response Curve
Fig. 5 Picture IF Sweep Alignment

11
TROUBLE SHOOTING CHARTS
A
B
A
B
GO TO
YES
DOES RLY1 (RELAY) OPERATE?
NO
NO POWER
GO TO
CHECK
IN/OUT VOLTAGES
OF I801(130VOLT REG)
IN: 150V
DC
OUT: 130V DC
2WATT
4
R413 18K
2WATT
R414 20K
CHECK
DOES
SHUT DOWN
CIRCUIT
OPERATE?
#30
(7.5V
DC )
30
26 23 24
5
4
Q402
H. OUTPUT
T402
F.B.T
CHECK
ALL THE POINTS
THEN CHANGE
I701
CHECK
Q402
COLLECTOR
D405
I701
NORMAL: 5V
RESET: 0V
16.5V
CHECK
16.5V LINE
Q701
RESET
IF #26 NORMAL
& NO OUTPUT AT
#23 THEN
CHANGE I501
CHECK
I801
STR30130
RLY1
RELAY
130V
DC
1
2 23
9PWR
CONTROL
KEY
KEY OPERATE?
CHECK DIODE
D701 & SWITCH
KEY BOARD
OPEN LOAD
THEN CHECK
#23 ON STATE
4 ~5V
CHECK
Q704 &
RELAY
Q704
POWER
CONTROL
D710
R759
CHECK
LEAD
SOLDERING
L801
LINE FILTER RLY1
RELAY
CHECK
F801
125V 4A
Q708
REGULATOR
5V
SHOULD
BE
4.3V-5.2V
I501
H.V
SHUT DOWN
OCCURS AT
22VDC

12
21
42
39
3
7
7
4
10
9
9
10
8
8
16
15
14
14112
10
44
31
11 14
C
D
H
H
GO TO
OK
CHECK THE WAVE FORM OF
I501 #44 NG
NO PICTURE
GO TO
I501
LA 7674
COMPOSITE
VIDEO INPUT
C
D
C217
Y-OUT
DRIVE
H. BLANKING
CHECK
190V
LINE
D404
Q506
VIDEO
CONTRAST
BRIGHT
CHECK
C410
R554
SUB-BRIGHT
CHECK
9V LINES
#11,14
C410
0.1 (M)
AGC PIN 4
Q501
ABL
CHECK
CONTROL
(MAX)
VOLTAGES
#39:7.5V
#31:6.2V
12V
5V
V
T (33V)
U001 TUNER
IF
ENADATA
CLK
CHECK
CRYSTAL
X701
CHECK THE
VOLTAGE
AT Q101 CHECK
IF AGC
VTG.
5V
DC
SF01
SAW FILTER
Q101
PRE-AMP
I501
LA7674
ADJUST
RF-AGC
R555
DETECTOR
OUTPUT
CHECK
9V LINE
#11, 14
TO Q504
CHECK
HEATER
VTG 6.3Vrms
R402
T402
FBT
H
I701
4241

13
4
6
30
11 1
14
44
48
4
48
E
F
GO TO
YES
CHECK FOR SIGNAL
AT I501 #6 NO
NO SOUND
GO TO
E
F
I501
LA7674
VOL-UP
DOWN
CONTROL
KEY
SOUND VOLUME
MAX: ~7V
DC
MIN: ~1V DC
CHECK
CONNECTOR
P601
I701
CHECK
9V
DC
LINE#11,14
LOW PASS
FILTER
Q602,Q603
AUDIO
OUT
T601
TSP1036 SP01 SPEAKER
Q601
AUDIO
AMP
DISCONNECT LOAD
CHECK FOR SND,
PWM SIGNAL, IF
MISSING REPLACE
I701
SOUND TAKEOFF
NO OUTPUT:
CHANGE I501
DE EMPHASIS
CHECK
FM DET.
CIRCUIT
CHECK
R601 &
123V LINE
X601
I501
LA7674
SOUND
IF INPUT
Z601
IF #4 IS OK
& NO OUTPUT
THEN
CHANGE I501

14
8, 9
10
47
12 15 16
39
38
24
8
27
51
50
46
45
G
GO TO
GOOD
CHECK INPUT SIGNAL
CONDITIONS
BAD
CH DON'T STOP
G
LOSS OF SIGNAL OR
WEAK SIGNAL
IF OUTPUT
CHECK
AFT WINDOW
VTG.
1.6V ~ 3.4V
ADJUST
RF AGC
R555
U001
TUNER
I701
H: NO SIGNAL
L: SIGNAL
S.D SIGNAL
DETECTION
ADJUST
PIF & AFT
REFER TO GENERAL
ADJUSTMENTS
I501
LA7674
AFT
PIF
Q507 AFT
DETECTOR
IF
S.D & AFC
ARE OK THEN
CHANGE IC701
Q702,Q709
SWITCHING
CIRCUIT

15
TINT
COLOR X501
C517
COMPOSITE
VIDEO
APC FILTER
NO COLOR
NO VERTICAL DEFLECTION
MAX.
6V
CHECK
9V
DC
MAX.
4V
R-Y
LUMINANCE (-Y) 190V LINE
TO CRT
G-Y
B-Y
CHECK
9V
DC
CHECK
CRYSTAL
CHECK
CONNECTOR
P101
I501
LA7674
I501
LA7674
Q951
~
Q956
R
G
B
41
36
42
12
13
14
18
19
20
21
14
12
2
48
28
11
CHECK 9V DC
CHECK
VERT.OUT I301
LA7837
CHECK THE WAVEFORM
I301 #12 NO OUTPUT:
CHANGE I301
R304 D302 R305
C308
R315
C309
C306
V.D.Y.
R301
R311
+
V,HEIGHT
CHECK 25V
DC
CRT
DRIVE

16
REMOTE CONTROL DOES NOT OPERATE
CAPTION DISPLSY DOES NOT OPERATE
IL01
REMOCON
SENSOR
ON SCREEN DISPLAY DOES NOT OPERATE
I701
CHECK
FOR 60Hz
OSC CHECK
R
G
YS
CHECK
FOR 15, 734Hz
Vsync
Hsync
GND 5V OUT
CHECK
WAVE-
FORM
I701
5V
19
25
24
42
18
B
17
22
41
COMPOSITE
VIDEO 2Vpp
R, G, B, YS
CHECK
IF OSD DOES NOT
OPERATE, CHANGE
I701
R, G, B, YS
CHECK
IF CAPTION
DOES NOT
OPERATE.
CHANGE I701
I701
R
G
B
YS
19
13
18
17
22
3

17
DESCRIPTION OF SEMICONDUCTORS
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
FM DET
IF AGC
EX AIN
FM DET
NFB
AOUT
GND
IF IN
IF IN
RF AGC
VCC
APC
VXO
VCC
RIN
GIN
BIN
R-Y
G-Y
B-Y
-Y
FBPIN
HOUT
HOLDDOWN
HOSC
HAFC
IFAPC
VCO
VCO
RF AGC
SIF IN
AFT OUT
AFT
AFT
VDET
AV S.W
VIN
TINT
EX. VIN
CONT
VIDEO
GND
COLOR
BDET
YIN
SHARP
CLAMP
BRIGHT
VCCH
SSEP
VOUT
HDET
52
51
50
49
48
47
46
45
44
43
42
41
40
39
38
37
36
35
34
33
32
31
30
29
28
27
LOCK
DET
VIDEO
AMP
FM-
DET
AFT
AF-
AMP
VIF
AMP
LIM
AMP
RF-
AGC
ACC
KILL-
ER
IF-
AGC
APC
VCO
TINT
SHARP
SOFT
VIDEO
DET
APC
DET
VCO
2NA
BPA
OSD
D.L
OSD-SWITCH
CARRIER-F
CONTRAST
COLOR
DEMO -Y OUT
FBT-DET
HOR
DRIVER HOR
OSC
PHASE
SHIFTRE
IST
BPA
BLACK
EXPAND
CLAMP
BRIGHT
AFC
2
HOR
C/D
FBT-
DET
SYNC/
SEP VER
C/D
HOR
COIN
AFC
1
VER
SYNC-
SEP
ATT
I501 LA7674
IF/VIDEO/CHROMA/DEF
LA7674 (VIF/SIF/VIDEO/CHROMA/DEFLECTION)
1. Case Outline : SDIP 52P
2. Pin Connections/Block Diagram

18
LSC420142B/43B (TUNING CONTROL)
RESET OSC1
142
IRQ OSC22 41
PC4/PAMIN PC33 40
PC5 PC2/ADCIN4 39
PA7 PC15 38
PA6 PB7/DA76 37
PA5 PB6/DA67 36
PA4 PB5/DA58 35
PA3 PB4/DA49 34
PA2 PB3/DA310 33
PA1 PB2/DA211 32
PA0 PB1/DA112 31
VIDEO PB0/DA013 30
PD0 PC014 29
PD1/SDIO PC615 28
PD2/SCK VCO16 27
PD3/B PLLGND17 26
PD4/G VSYN18 25
PD5/R HSYN19 24
V DD
PD720 23
V SS
PD6/FBKG21 22
1) Case Outline : DIP-42S plastic package
2) Function: C-MOS 4 bit microcomputer, PWM control, CHANNEL SEARCH/MEMORY, ON/OFF, timer, sleep time, on
screen display, TV/CATV (STD,HRC,IRC)
3) PIN connections

19
DESCRIPTION OF SEMICONDUCTORS AND TUNER
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
TUNER(U001)
ENA
DATA
CLK
+5V
BP
BT
AGC
+12V
IF
VERTICAL OUTPUT(I301)
PUMP-UP OUTPUT
1
5
3
11
6
1
5
3
11
6
2 9 13
+9V
50/60Hz
ONE SHOT
GND
RAMP GEN.
VERT TRIGGER
INPUT POWER SUPPLY
FOR V-OUT
+25V
OSC BLOCKING
V-OUT
AC/DC FEED BACK
VERT.HEIGHT
130V REGULATOR(I801) EEPROM(I702)
BASE OUTPUT CLOCK DATA
GROUND INPUT
8 7 6 5
1 2 3 4

Product safety servicing guidelines for color
television receivers
CAUTION :Do not attempt to modify this product in any
way. Unauthorized modifications will not only void the
warranty, but may lead to your being liable for any
resulting property damage or user injury.
Service work should be performed only after you are
thoroughly familiar with all of the following safety checks
and servicing guidelines. To do otherwise, increases the
risk of potential hazards and injury to the user.
SAFETY CHECKS
After the original service problem has been corrected, a
check should be made of the following:
SUBJECT : FIRE & SHOCK HAZARD
1. Be sure that all components are positioned in such a
way as to avoid possibility of adjacent component
shorts. This is especially important on those chassis
which are transported to and from the repair shop.
2. Never release a repair unless all protective devices
such as insulators, barriers, covers, shields, strain
reliefs, and other hardware have been reinstalled per
original design.
3. Soldering must be inspected to discover possible cold
solder joints, frayed leads, damaged insulation
(including A.C. cord), solder splashes or sharp solder
points. Be certain to remove all loose foreign particals.
4. Check for physical evidence of damage or deterioration
to parts and components, and replace if necessary
follow original layout, lead length and dress.
5. No leads or components should touch a receiving tube
or a resistor rated at 1 watt or more. Lead tension
around protruding metal surfaces must be avoided.
6. All critical components such as fuses, flameproof
resistors, capacitors, etc. must be replaced with exact
factory types. Do not use replacement components
other than those specified or make unrecommended
circuit modifications.
7. After re-assembly of the set always perform an A.C.
leakage test on all exposed metallic parts of the
cabinet, (the channel selector knob, antenna terminals,
handle and screws) to be sure the set is safe to operate
without danger of electrical shock. Do not use a line
isolation transformer during this test. Use an A.C.
voltmeter, having 5000 ohms per volt or more
sensitivity, in the following manner : connect a 1500
ohm 10 watt resistor, paralleled by a 0.15µF. 150V A.C.
type capacitor between a known good earth ground
(water pipe, conduit, etc.) and the exposed metalic
parts, one at a time. Measure the A.C. voltage across
the combination of 1500 ohm resistor and 0.15µF
capacitor. Reverse the A.C. plug and repeat A.C.
voltage measurements for each exposed metallic part.
Voltage measured must not exceed 0.75 volts R.M.S.
This corresponds to 0.5 milliamp A.C. Any value
exceeding this limit constitutes a potential shock hazard
and must be corrected immediately.
GRAPHIC SYMBOLS :
The lightning flash with arrowhead symbol,
within an equilateral triangle, is intended to
alert the service personnel to the presence of
uninsulated dangerous voltage that may be
of sufficienty magnitude to constitute a risk of
electric shock.
The exclamation point within an equilateral
triangle is intended to alert the service
personnel to the presence of important safety
information in service literature.
SUBJECT : X-RADIATION
1. Be sure procedures and instructions to all service
personnel cover the subject of X-radiation. The only
potential source of X-rays in current T.V. receivers is
the picture tube. However, this tube does not emit X-
rays when the high voltage is at the factory specified
level. The proper value is given in the applicable
schematic. Operation at higher voltages may cause a
failure of the picture tube or high voltage supply and,
under certain circumstances, may produce radiation in
excess of desirable levels.
2. Only factory specified C.R.T. anode connectors must
be used. Degaussing shields also serve as X-ray shield
in color sets. Always re-install them.
3. It is essential that the serviceman has available an
accurate and reliable high voltage meter. The
calibration of the meter should be checked perio -
dically against a reference standard. Such as the one
available at your distributor.
4. When the high voltage circuitry is operating properly
there is no possibility of an X-radiation problem. Every
time a color chassis is serviced, the brightness should
1
SAFETY PRECAUTIONS
10WATT
Good earth ground,
such as the water
pipe, conduit, etc. 1500 OHM
0.15µF
A.C. VOLTMETER
Place this probe
on each exposed
metal part.

2
be run up and down while monitoring the high voltage with
a meter to be certain that the high voltage does not
exceed the specified value and that it is regulating
correctly. We suggest that you and your service
orgainzation review test procedures so that voltage
regulation is always checked as a standard servicing
procedure. And that the high voltage reading be recorded
on each customer'sinvoice.
5. When troubleshooting and making test measurements
in a receiver with a problem of excessive high voltage,
avoid being unnecessarily close to the picture tube and
the high voltage compartment.
Do not operate the chassis longer than is necessary to
locate the cause of excessive voltage.
6. Refer to HV, B+ and Shutdown adjustment procedures
described in the appropriate schematic and
diagrams(where used).
SUBJECT : IMPLOSION
1. All direct viewed picture tubes are equipped with an
integral implosion protection system, but care should be
taken to avoid damage during installation. Avoid
scratching the tube. If scratched, replace it.
2. Use only recommended factory replacement tubes.
SUBJECT : TIPS ON PROPER
INSTALLATION
1.Never install any receiver in closed-in recess,
cubbyhole or closely fitting shelf space over, or close to
heat duct, or in the path of heated air flow.
2. Avoid conditions of high humidity such as : Outdoor
patio installations where dew is a factor. Near steam
radiators where steam leakage is a factor, etc.
3. Avoid placement where draperies may obstruct rear
venting. The customer should also avoid the use of
decorative scarves or other coverings which might
obstruct ventilation.
4.Wall and shelf mounted installations using a
commercial mounting kit, must follow the factory
approved mounting instructions. A receiver mounted to
a shelf or platform must retain its original feet(or the
equivalent thickness in spacers) to provide adequate
are flow across the bottom, blots or screws used for
fasteners must not touch any parts or wiring. Perform
leakage test on customized installations.
5. Caution customers against the mounting of a receiver
on sloping shelf or a tilted position, unless the receiver
is properly secured.
6. A receiver on a roll-about cart should be stable on its
mounting to the cart. Caution the customer on the
hazards of trying to roll a cart with small casters across
thresholds or deep pile carpets.
7. Caution customers against the use of a cart or stand
which has not been listed by underwriters laboratories,
inc. For use with their specific model of television
receiver or generically approved for use with T.V.'s of
the same or larger screen size.

26
REPLACEMENT PARTS LIST
LOC. PART-CODE PART-NAME PART-DESC
C101 CCZF1E103Z C CERA 25V F 0.01MF Z (AXIAL)
C102 CCZF1E103Z C CERA 25V F 0.01MF Z (AXIAL)
C103 CCZF1E103Z C CERA 25V F 0.01MF Z (AXIAL)
C104 CEXF1C471V C ELECTRO 16V RSS 470MF (10X12.5)TP
C105 CEXF1H109V C ELECTRO 50V RSS 1MF (5X11) TP
C106 CEXF1H229V C ELECTRO 50V RSS 2.2MF (5X11) TP
C301 CMXM2A104J C MYLAR 100V 0.1MF J TP
C302 CMXM2A103J C MYLAR 100V 0.01MF J (TP)
C303 CEXD1H229Q C ELECTRO 50V RT 2.2MF (6.3X11) TP
C304 CEXF1H470V C ELECTRO 50V RSS 47MF (6.3X11) TP
C305 CXSL2H100D C CERA 500V SL 10PF D (TAPPING)
C306 CEXF1V471V C ELECTRO 35V RSS 470MF (10X20) TP
C307 CEXD1H229Q C ELECTRO 50V RT 2.2MF (6.3X11) TP
C308 CCXB2H471K C CERA 500V B 470PF K (TAPPING)
C309 CEXF1E102V C ELECTRO 25V RSS 1000MF (13X20) TP
C310 CEXF1C470V C ELECTRO 16V RSS 47MF (5X11) TP
C401 CEXF2C109V C ELECTRO 160V RSS 1MF (6.3X11) TP
C402 CCXB2H102K C CERA 500V B 1000PF K (TAPPING)
C403 CCXB2H471K C CERA 500V B 470PF K (TAPPING)
C404 CMYH3C622J C MYLAR (20") 1.6KV 6200PF J (BUP)
C404 CMYH3C602J C MYLAR (14") 1.6KV 6000PF J (BUP)
C405 CEXF1H479V C ELECTRO 50V RSS 4.7MF (5X11) TP
C406 CEXF1E102V C ELECTRO 25V RSS 1000MF (13X20) TP
C407 CEXF1H479V C ELECTRO 50V RSS 4.7MF (5X11) TP
C408 CEXF1H109V C ELECTRO 50V RSS 1MF (5X11) TP
C409 CEXF1H220V C ELECTRO 50V RSS 22MF (5X11) TP
C410 CMXM2A104J C MYLAR 100V 0.1MF J TP
C411 CCXB2H152K C CERA 500V B 1500PF K (TAPPING)
C412 CCXB2H152K C CERA 500V B 1500PF K (TAPPING)
C413 CMYE2D514J C MYLAR (20") 200V 0.51MF J (PL)
C413 CMYE2D474J C MYLAR (14") 200V 0.47MF J (PL)
C414 CEXF2C109V C ELECTRO 160V RSS 1MF (6.3X11) TP
C415 CEXF2E100V C ELECTRO 250V RSS 10MF (10X20) TP
C416 CCXB2H102K C CERA 500V B 1000PF K (TAPPING)
C501 CEXF1C102V C ELECTRO 16V RSS 1000MF (10X20) TP
C502 CEXF1H109V C ELECTRO 50V RSS 1MF (5X11) TP
C503 CCZB1H471K C CERA 50V B 470PF K (AXIAL)
C504 CEXF1H100V C ELECTRO 50V RSS 10MF (5X11) TP
C505 CEXF1H479V C ELECTRO 50V RSS 4.7MF (5X11) TP
C506 CEXF1H228V C ELECTRO 50V RSS 0.22MF (5X11) TP
C507 CEXF1H108V C ELECTRO 50V RSS 0.1MF (5X11) TP
WARNING:BEFORE SERVICING THIS CHASSIS, READ THE "X-RAY RADIATOIN,PRECAUTION "SAFETY
PRECAUTION" AND "PROUCT SAFETY NOTICE" ON PAGE1 OF THIS MANUAL