Magnum CTV-2120 TXT User manual

MODEL:
SERVICE MANUAL
CTV-2120 TXT
TV SET

2
SAFETY INSTRUCTIONS
WARNING: BEFORE SERVICING THIS CHASSIS, READ THE "X-RAY
RADIATION PRECAUTION", "SAFETY PRECAUTION" AND "PRODUCT SAFETY
NOTICE" DESCRIBED BELOW.
X-RAY RADIATION PRECAUTION
1. Extremely high voltage of the picture tube may result in producing potentially hazardous X-RAY RADIATION. To
avoid such hazards, the high voltage must not be above the specifiedlimit.
The nominal value of the high voltage of this receiver is about 25.9 kV at zero beam current (minimum brightness)
under 175-245V AC power source.
The high voltage must, under any circumstances, not exceed about 30.5 kV.
Each time this receiver requires servicing, the high voltage should be checked according to the HIGH VOLTAGE
CHECK procedure at the back of this manual. it is recommended to record the reading of the high voltage in the
service record each time. Using an accurate and reliable high impedance and high voltage meter is quite important.
Connect the NEGATIVE and POSITIVE probe of a high voltage meter to the "ground" and the high voltage anode
cap of the picture tube respectively.
HIGH VOLTAGE CHECK CONNECTION DIAGRAM
2. The only source of X-RAY RADIATION in this receiver is the picture tube. For ensuring the intensity of X-RAY
RADIATION from the picture tube being within the specified safety limit, the replacement picture tube must be
exactly the same type specified in the parts list.
3. Some parts in this receiver have special safety-related characteristicswhich would affect X-RAY RADIATION
protection. For safety, parts replacement should be carried out only after referring to the "PRODUCT SAFETY
NOTICE" below.
PRODUCTSAFETY NOTICE
Many electrical and mechanical parts in this receiver have special safety-related characteristics (directly relate to
high voltage, high temperature or electric shock) which are not easily seen by visual inspection. Whenever replacing
such components, make sure that the replacement parts can provide effective X-RAY RADIATION protection even
though their high voltage and wattage can meet the specification of the original design. Such parts can be identified by
shading and marking with in the schematic diagram and the parts list.
Before replacing any of these components, read the parts list in this manual carefully. Using substitute parts which do
not have the same safety characteristics as the ones specified in the parts list may create excessive X-RAY RADIATION.
I2C BUS CONCEPT
(1). Characteristics
1.1 I2C Bus consists of clock (SCL) and data (SDA) lines.
1.2 It transmits data among integrated circuits in full duplex mode.
1.3 It is composed of a main IC chip (CPU) and one or more sub-IC chips.
lThe CPU mainly operates data transmissions and also generates clock signal.
lThe CPU also controls all sub-IC chips, making them work.
(2). I2C Bus Application in this TV unit
High impedance and high voltagh meter Chassis Picture tube ground
Picture tube high voltage anode cap

3
SDA
SCL
SDA
SCL
SDA
SCL
In this TV unit, IC801 is the main chip while IC802, IC201 and other chips are regarded as sub-chips.
2.1 IC801 (CPU) controls the functions of IC201 via the I2C bus between them.
2.2 The data of channel positions, BT voltage, band, AFT, clear, volume, power on/off, timer, color, etc. are written
into, stored in and read out from IC802 via the I2C bus.
SAFETY PRECAUTION
1.High voltage of 24-26 kV is always present inside this receiver when it is operating, so be cautious of electric shock
hazard while removing the back cabinet to process adjustment.
(A) Servicing should not be attempted by any person who is not very familiar with the required re-cautions when
working on this high-voltage equipment.
(B) Before removing the anode cap of the picture tube, discharge the high voltage potential from the picture tube
anode several times by short-circuiting the anode together with its ground tokeep off electric shock hazard.
(C) Perfectly discharge the high voltage potential of the picture tube before handling the picture tube which is
highly evacuated. When it is broken, danger may be caused because of the violent burst of its glass fragments.
2. If the fuse in this receiver is blown, replace it with the type specified in the chassis parts list or with the same
specifications (never use other types).
3. Whenever replacing with new components, twist the lead wires of the component together with the concerned
residual leads before soldering.
4. Whenever replacing with a new high wattage resistor (such as oxide metal filmresistor) on any of the circuit boards,
keep the body of the resistor 10 mm above the circuit board.
5. Keep all connecting wires away from the components of high voltage or high temperature.
6. This receiver is designed to operate at AC 175-245V~50/60Hz, NEVER connect to DC supply or any other power
sources.
7. The main chassis of this receiver is perfectly isolated.
INSTALLATION AND SERVICE ADJUSTMENTS
GENERAL INFORMATION:
Normally, this receiver have been thoroughly checked and adjusted before leaving the factory; therefore it should
operate normally and produce perfect color and B/W pictures upon installation. However, several minor adjustments
may be required according to the practical situation.
This receiver is packed in a cardboard carton during transportation. Carefully draw it out from the carton and remove
all packing materials.
Plug the receiver's power cord into a convenient 175-245V 50/60Hz AC two pinsor three pins power outlet.
Check and adjust all the customer controls such as BRIGHTNESS, CONTRAST and COLOUR to obtain natural color or
B/W picture.
AUTOMATIC DEGAUSSING :
A degaussing coil is mounted around the picture tube so that external degaussing after moving the receiver is
normally unnecessary, providing the receiver is properly degaussed upon installation. The degaussing coil operates for
about 1 second after the power to the receiver is switched ON. If the set is moved or faced in a different direction, the
power switch must be switched off at least one hour in order that the automatic degaussing circuit operates properly.
And then the receiver turned it again.
Should the chassis or parts of the cabinet become magnetized to cause poor colour purity, use an external degaussing
coil. Slowly move the degaussing coil around the faceplate of the picture tube, the sides and front of the receiver and
slowly withdraw the coil to a distance of about 2 meters before disconnecting it from AC source. If colour shading still
persists, perform the “COLOUR PURITY ADJUSTMENT” and “CONVERGENCE ADJUSTMENTS” procedures as
mentioned later.

4
Remote Handset Operation
Top View of Remote Control
HOW TO OPERATE REMOTE CONTROL
There are 27 buttons on the remotecontrol. It operates with infra-red beam which is not affected by noise or other
interferences. Make sure strong light never strikes on the infra-red receiver; otherwise, it would obstruct the remote
control working normally with the TV unit.
Do not drop or expose it to high temperature.
*4 (FOR NICAM/ GERMAN STEREO ONLY) *15-27 (FOR TELETEXT ONLY)
1. SOUND MUTING BUTTON
2. NUMBER (0-9) BUTTONS
3. STATUS (RED) BUTTON
4. NICAM BUTTON
5. PERSONAL PREFERENCE (GREEN) BUTTON (PP)
6. MENU BUTTON
7. VOLUME (UP/DOWN) BUTTONS
8. STANDBY BUTTON
9. DIGITSELECTBUTTONS
10. TV/AV BUTTON
11. PREVIOUS (YELLOW) BUTTON
12. ANALOG BUTTON
13. SLEEP (BLUE) BUTTON
14. PROGRAM (UP/DOWN) BUTTONS
15. CANCEL BUTTON
16. SUBCODE BUTTON
17. STOP BUTTON
18. REVEAL BUTTON
19. TV/TXT. BUTTON
20. INDEX BUTTON
21. MIX. BUTTON
22. SIZE BUTTON
23. DIGIT ENTRY (0-9) BUTTONS
24-27.COLOUR BUTTON
HOW TO DISASSEMBLE REMOTE CONTROL HAND UNIT (see Fig. 1)
1. Remove the battery cover and loosen the screws.
2. Open one side of the back cabinet to take it away from the front cabinet.
Fig. 1
REVEAL
SUBCODE
PP
AV
STOP
CANCEL
VOL
P
P
VOL
STATUS
NIACM ANALOG
SIZE
INDEX
SLEEP
MIX
TV/TXT
RECALL
+
+
-

5
METHOD OF REMOVING BACK CABINET(see Fig. 2)
Attn.: Before disassembling the back cabinet, first draw the power cord plug of the receiver from AC outlet.
1. Disconnect the antenna cable from the antenna terminal.
2. Loosen the 5pieces of screw (A) used in fixing the antenna jack plate on the back cabinet.
3. Loosen the 9pieces of screw (B) used in fixing the back cabinet to the front cabinet; thenremove the back cabinet.
Screws(B)
Screws(B)
Screws(A)
Fig.2
METHOD OF REMOVING PICTURE TUBE(see Fig. 4)
After taking out the chassis holder (main chassis), proceed the following procedures accordingly:
1. Turn the receiver down and let the screen of the picture tube face downward, and put it on a soft cushion.
2. Loosen the 4 pieces of nut used in fixing the picture tube on the front cabinet, remove the degaussing coil; then use
two hands to hold the edges of the picture tube tightly and draw it out.
3. Detach the ground wire of the picture tube which is attached to thelugs of the picture tube with springs.
Fig.4
SUGGESTION: Before servicing the chassis, please read through “X-RAY RADIATION PRECAUTION",
"SAFETY PRECAUTION" and "PRODUCT SAFETY NOTICE" atPage 2& 3of this manual.
GENERAL ADJUSTMENT INSTRUCTIONS
This receiver is transistorized and special care should be taken when servicing. If not necessary, do not attempt any
adjustments because the requirements of the procedures are very stringent. Read the following matters before
attempting any adjustments.
An isolation transformer should be used during any dynamic service to avoid possible electricshock hazard.
The test equipment specified or their equivalent is required in having proper alignment. Using unsuitable equipment,
which do not meet these requirements, may result in improper alignment.
Correct matching of the equipment is essential. Failure of using proper matching will result in responses which cannot
show the true operation of the receiver.
Excessive signal by using a sweep generator can cause the receiver circuit overloaded. Overloading should be avoided
to obtain a true response curve. Insertion of markers by using the marker generator should not cause the response
curve distorted.

6
The AC power line voltage should be accurately kept during alignment.
During the process of alignment, the AC voltage should be kept in the range from 215V to 225V (50Hz).
Do not attempt to connect or disconnect any wire while the receiver is in operation. Make sure the power cord is
unplugged before replacing any parts in the receiver.
Unless specified, start adjustments after the receiver is turned on for at least 30 seconds.
CHASSIS'S TOP VIEW
VR 501
MAIN CHASSIS PC BOARD
T901
NOTICE:
1. Resistor
All resistors are of 1/8W Carbon Film type except those listed below. The unit of measure for resistor is OHM
(K = 1,000 ohm, M = 1,000,000 ohm).
CARBON FILM RESISTOR
CARBON COMPOSITION RESISTOR
METAL OXIDE RESISTOR +5%
METAL OXIDE RESISTOR +2%
FUSIBLE RESISTOR
NON-INFLAMMABLE RESISTOR
PTC THERMISTOR
VARIABLE RESISTOR
2. Capacitor
All capacitors are of50V Ceramic type except thoselisted below. The unit of measure for capacitor is
FARAD (F) (UF = 0.000001 F, PF = UUF = 0.000001 UF)
CERAMIC CAPACITOR
TANTALUM CAPACITOR
POLYESTER FILM CAPACITOR
POLYPROPYLENE FILM CAPACITOR
ELECTROLYTIC CAPACITOR
TRIMMER CAPACITOR
METAL POLYESTER FILM CAPACITOR
3. Unit of Measure: UH
4. Test Point
5. Marking of Ground Wire
: Ground wire of chassis (COLD)
: Ground wire of external wire (HOT)
6. Voltage Measurement
The voltages at all points should be measured with a digital multi-meter, and the measuring conditions are as
follows:
Power Source: AC220V 50Hz
Receiving Signal: Color Bar Signal
All Control Buttons: in Normal Position
7. Waveform
The numeral in the small circle represents the number of waveform, refer to the waveform table.
8. It is easy to locate a connection point in the direction as indicated by arrow (↗).
9. The schematic diagram in this manual is drawn according to the original design. It may be slightly different from the
actual circuit of the receiver because of any change in the circuit subject to no prior notice.
Notice: This circuit has a transformer to isolate the power supply circuit from the majority of the other circuit, and
they can be identified in the schematic diagram by marking with "HOT" and "COLD”. Please note the
followings .All circuits are "COLD" except power supplycircuit.
(1) To avoid electric shock hazard, never touch the "HOT" and "COLD" circuit simultaneously.

7
(2) Never short-circuit the "HOT" and "COLD" circuit to prevent the fuse or other components from burning.
(3) Never connect any measuring equipment such as oscilloscope to both the "HOT" and "COLD" circuit at thesame
time to prevent the fuse from burning. Also, connect the ground of the measuring equipment to the ground of the
circuit being tested.
(4) Never fail to unplug the power cord of the receiver before taking out the chassis.
TEST EQUIPMENT :
EQUIPMENT SPECIFICATION
High Impedance Voltmeter Having an impedance of at least 100 Kohm.
Oscilloscope Volt sensitivity over 10mV input impedance over 1
Mohm, below 10PF.
Sweep/Marker Generator Output adjustable to at least 0.1 volts rms.
Colour Bar Generator Withfunctions: BAR/DOT/SQUARE/SYSTEM
SELECT/VIDEO OUTPUT TERMINAL/CROSS-
HATCH/S-VIDEO OUTPUT TERMINAL functions
and green or red purity signal.
Power Supply Source such as a battery or a well regulated and
isolated DC bias supply. (Adjust 0-20V)
AC/DC Voltmeter High sensitive (better use digital voltmeter)
Isolation Transformer Voltage adjustable type having capacity of more
than 200 watts.
Probe Low-capacitance / High impedance.
FM/AM Signal Generator National ; MODEL : VP8177A
B+ VOLTAGE ADJUSTMENT
Notice: (A) B+ voltage closely relates to the picture tube's positive high voltage.
(B) To prevent it from producing excessive hazardous X-RAY RADIATION, ensure that B+ voltage must be
adjusted to at the 108VPOSITIONS.
1. Check the AC line voltage supplied is AC220V +-5% 50 Hz.
2. Turn in an active channel, adjust BRIGHTNESS and CONTRAST controls to obtaina normal picture.
3. Connect test point (C506) on the MAIN CHASSIS PCB with high impedance DC voltmeter.
4. Adjust VR501 (on the MAIN PCB) for B+ 108V +/-0.3V voltage reading.
VCO IF ADJUSTMENT:
(1) In AV mode, disconnect the solder link( P1 ) on main chassis board.
(2)Connect an Oscilloscope Measure pin 1of IC201.
(3)Does not apply signal to Tuner & Power on TV.
(4) Access service mode, then selects PIF VCO item adiustment setting date = 80
(5)Adjust the VCO coil (L204) so that the pin 1of IC201 voltage is DC 2.5V and the waveform
(see Fig.6)
(6)Press Factory handset [PP] key to finish.
(7) Turn off TV set and connect the solder link( P1 ) on main chassis board.
(1) Press Factory handset [PP] key to finish.
5V 5V
2.5V 2.5V

8
0 Incorrect Waveform
0 Correct Waveform
(Fig. 5) (Fig. 6)
AGC DELAY ADJUSTMENT:
(1)Tune the strongest station in yourarea.
(2) Access service mode, then selects RF AGC item adiustment setting is about = 24 in the range (00 TO 3F).
(3)The snow just disappears from the screen.
WHITE BALANCE ADJUSTMENT:
(1)Tune in a active channel and warm up the set for 15 minutes.
(2)Rotate the screencontrol fully counter clockwise .
(3) Access service mode,and press 'MUTE' button.
(4)Rotate the screen control gradually clockwise until the first horizontal line appears on the
screen.
(5)Set the [ CUT OFF --- R,G, B, ]items. Component level to get a white horizontal line .
(6)Press [MUTE] key against, Set the Brightness and Contrast controls at normal position,
Colour control to the minimum level.
(7) Set the[ Green Gain& Blue Gain] items to maintain a good white balance at the brightest part of the screen.
Set the brightness and contrast controls to maximum and minimum. Observe the screen white balance , if it is not
proper in high brightness or low brightness condition , Set the [CUT OFF --- R,G, B] items or [Green Gain& Red
Gain] items, in order to maintain a good white balance in both low and high luminance conditions.
B-Y, R-Y ADJUSTMENT (SECAM) ONLY :
(1)Set colour System [AUTO ] or [SECAM].
(2)Receive SECAM colour bar signal.
(3)Set the Brightness and Contrast controls at normal position, Colour control to the minimum.
(4) Set the[ Secam B-Y & Secam R-Y ] items to maintain a good white balance at the brightest part of the screen.
HIGH VOLTAGE CHECK:
CAUTION : There is no HIGH VOLTAGE ADJUSTMENT on this chassis.
a. Connect an accurate high voltage meter to the second anode of the picture tube.
b. Turn on the receiver and set the BRIGHTNESS, COLOUR and CONTRAST Controls to the minimum (zero
beam current).
c.High voltage will be measured below30.5 KV.
d. Adjust the BRIGHTNESS Control to both extremes toensure the high voltage does not
exceedthe limit of 34KVunder any circumstances.
FS CIRCUIT CHECK:
a. Push the Power Switch on and adjust all controls for normal operation.
b. Temporarily connect a 18Kohm resistor acrossR919 on the Main Chassis PC Board. Raster and sound will
disappear.
c. The receiver must remain in this state even after removing the resistor. This is the evidence that the Fail
Safe circuit is functioning properly.
d. To obtain a picture again, temporarily push the power switch off and allow the Fail Safe circuit move than
30 seconds to reset. Then push the power switch on to produce a normal.
FOCUS ALIGNMENT :
Tune in an active channel or Phillips Pattern. Adjust the Focus control onthe FLYBACK
TRANSFORMER (T901) for well defined scanning lines in the center area on the screen.
HORIZONTAL ADJUSTMENT
a. Receive the Phillips Pattern. Apply a crosshatch signal.
b. Set the contrast and colour to theirminimum, and the brightness to its maximum.
c. Adjust (H-POSITION 50/60) to move the picture at the center.
Adjust (H-SIZE 50/60) to move rightful highpicture.
ATTN.: These settings should be done with separate test signals with a 50 Hz and a 60 Hz field frequency. These
parameters are stored in separate groups for 50 Hz and 60 Hz and are recalled or set, depending on the field
frequency of the currently received program.

9
VERTICAL ADJUSTMENT
Apply a crosshatch signal.
Adjust (V-SCORRECTION) to obtain a s-correction picture.
Adjust (V-LINEARITY 50/60) to obtain a linear picture.
Adjust (V-POSITION 50/60) to move the picture at the center.
Adjust (V-SIZE 50/60) to obtain rightful high picture.
ATTN.: These settings should be done with separate test signals with a 50 Hz and a 60 Hz field frequency. These
parameters are stored in separate groups for 50 Hz and 60 Hz and are recalled or set, depending on the field
frequency of the currently received program.
SAFETY PRECAUTION :
Dielectric voltage withstand test :
The following accessible parts should be stressed for a period of one second on each complete appliance before it
leaves the factory.
The test potential voltage not less than 3500V, 50Hz should be applied for 1 second between both blades of the
attachment plug cap. and the following parts :
Name of part Locations
1. Antenna Terminal Back Cabinet
2. AV input Terminals Front / Back Cabinet
3. AV output TerminalsBack Cabinet
3. Enclosure Screws Back Cabinet
4. S-Video Sockets Front Cabinet
5. Ext. Speaker Terminals BackCabinet
COLOUR PURITY ADJUSTMENT
Note: Before attempting any color purity adjustments, the receiver should be turned on for at least 30 minutes.
(see Figure 8). A few rubber wedges should be available for use whenever necessary during the
process of color purity adjustment.
a. Demagnetize the picture tube and cabinet using an external degaussing coil.
b. Turn the CONTRAST and BRIGHTNESS controls to maximum.
c. Adjust RED and BULE bias controls (R-CUT OFF) and (B-CUT OFF) to provide only a green raster.
Advance the GREEN bias control (G-CUT OFF) is necessary.
d. Loosen the clamp screw holding the yoke and slide the yoke and slide the yoke backward to provide
vertical green belt (zone)in the picture screen.
e.Remove the rubber wedges.
f. Rotate and spread the tabs of the purity magnet (See Fig. 9around 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.
g. Move the yoke slowly forward or backward until a uniform green screen is obtained. Tighten the clamp
screw of the yoke temporarily.
h. Check the purity of the red and blue raster by adjusting the(CUT OFF) bias controls.
i. Obtain a white raster, referring to"CRT GREY SCALE ADJUSTMENT (White Balance Adjustment).
j. Proceed with convergence adjustment.
CENTER CONVERGENCE ADJUSTMENT :
Note : Before attempting any convergence adjustments, the receiver should have operated for at least fifteen minutes.
a. Receive crosshatch pattern with a colour bar signal generator.
b. Adjust the BRIGHTNESS and CONTRAST controls fora well defined pattern.
c. Adjust two tabs of the 4-Pole magnets to change the angle between them (See Fig.9) and superimpose red and
blue vertical lines in the center areaof the picture screen (See Fig. 10).
d. 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. 10).
e. Adjust two tabs of 6-Pole magnets to superimpose red and blue line with green one. Adjusting the angle affects
the vertical lines and rotating both magnets affects the horizontal lines.
f. Repeat adjustmentsc,d,e, keeping in mind red, green and blue movements because 4-Pole magnets and 6-Pole
magnets mutual affection and make dot movement complex.
CIRCUMFERENCE CONVERGENCE ADJUSTMENT :

10
a. Loosen the clamping screw of the deflection yoke to allow the yoke to tilt.
b. Put a wedge as shown in Fig.8 temporarily. (Do not removethe cover paper on the adhesive part of the wedge).
c. Tilt front of the deflection yoke up or down to obtain better convergence in circumference. (See Fig.10).
Push the mounted wedge into the space between the picture tube and the yoke to hold the yoke temporarily.
d. Put another wedge into bottom space and remove the cover paper to stick.
e. Tilt front of the yoke right or left to obtain better convergence in circumference. (See Fig. 10).
f. Keep the yoke position and put another wedge in either upper space. Remove the cover paper and stick the
wedge on picture tube to hold the yoke.
g. Detach the temporarily mounted wedge and put it in another upper space. Stick it on the picture tube to fix the
yoke. After fixing three wedges, recheck overall convergence.
h. Tighten the screw firmly to hold the yoke tightly in place. Stick 3 adhesive tapes on wedges as shown in Fig. 8.

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DEFLECTION YOKE
PURIIY AND
CONVERGENCE
MAGNET ASS Y
RUBBER
WEDGES
33 mm
(1-5/16 )
TEMPORARY
MOUNTING
RUBBER WEDGES
LOCATION
RUBBER WEDGE
ADHESIVE
4-POLE MAGNETS
PURITY MAGNETS
6-POLE
MAGNETS
ADJUST THE ANGLE
(VERTICAL LINES) FIXED
CONVERGE MAGNET ASSEMBLY
Figure 9
ADJUSTMENT OF MAGNETS
ROTATE TWO TABS
AT THE SAME TIME
(HORIZONTAL LINES)
BLU RED
BLU BLU
BLU
RED
RED
RED
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
Fig .10 Dot movement Pattern
GRN
/
30 30
30 DEF.YOKE
Figure 8
/
R
G
B
R
G
B
FACTORY ADJUSTMENT MODE:

12
HOW TO ACCESS THE SERVICE MODE
1. First press the VOLUME "-" button in the TV set until thevolume turn to zero.
2. Keep pressing this button, then press the "status" button on the remote contol,then you can access the service mode.
Use the [MENU], [CH UP],[CH DOWN], [VOL UP]or [VOL DOWN]button to highlight the item to set ,which is
displayed in red. Other items are displayed in white.
3. Finally, press the 'PP' button to log out of the service mode.
Attention:
(1) In case the user should forget the password that has been entered, there is a “built-in” password,
that will always work:512.
(2) The data marked with “#” are not allowed to change.
nPress [MENU] to display the Service 1 MENU.
nPress [CHANNEL UP OR DOWN] to select the highlighted item, then [VOL DOWN],or
[VOL UP] to increase or decrease the setting, The data is written to EEPROM.
nTB1238AN Adjustment Items
Rf AGC: Selects RF AGC adjustment setting is 24 in the range 00to 3F.
V SC: Selects vertical s-correctionadjustment setting is about 08 in the range 00 to 0F.
H Position50: Selects horiztion position 50 adjustment setting is 10 range 00 to 1F.
V POS 50: Selects vertical position 50 adjustment setting is 04 in the range 00 to 07.
V Size 50: Selects vertical size 50 adjustment setting is 17 in the range 00 to 3F.
V Linearity50: Selects vertical linearity 50 adjustment. Setting is0B in the range00 or 0F.
H Position60: Selects horiztion position 60 adjustment setting is 0F range 00 to 1F.
V POS 60: Selects vertical position 60 adjustment setting is 04 in the range 00 to 07.
V Size 60: Selects vertical size 60 adjustment setting is 16 in the range 00 to 3F.
V Linearity60: Selects vertical linearity 60 adjustment. Setting is0Ain the range 00 or 0F.
Brightn Max: Selects brightness maximum adjustment . Setting is 58 in the range from 00 to 7F.
Bright Min: Selects brightness minimum adjustment. Setting is 28 in the from 00 to 58.
Sub Tint: Selects sub tint adjustment setting is 50 in the from 00 to 7F.
PIF VCO: Selects PIF VCO adjustment setting is 80 in the from 00 to FF.
nPress [MENU] to display the Service 2 MENU.
Service 1
RF AGC 24
V SC 08
H Position 50 10
V Position 50 04
V Size 50 17
V Linearity 50 0B
H Position 60 0F
V Position 60 04
V Size 60 16
V Linearity 60 0A
Bright Max 58
Bright Min 28
Sub Tint 50
PIF VCO # 80
Service 2
Logo CONTEC
RGB Contrast 30
Sub Contrast 06
Secam B-Y 08
Secam R-Y 07
Time #0B
PREFM #00
PRE NICAM #00
PRE LINE IN #00
DRAG MULTIPE #0C
DRAG BASE #04
Hi Voltage #FF
Bus Off #01
VCO Coarse #00
VCO Fine L1 #00

13
nPress [CHANNEL UP OR DOWN] to select the highlighted item, then [VOL DOWN],or [VOL UP] to
increase or decrease the setting, The data is written to EEPROM.
nTB1238AN Adjustment Items
Logo-----: Selects logo adjustment setting is thirteen characters.
RGB Contrast: Selects RGB contrast adjustment setting is 30 in the range 00to 3F.
Sub Contrast: Selects sub contrast adjustment setting is about 06 in the range 00to 0F.
SECAM B Y: Selects secam B-Yadjustment setting is08 range 00to 0F.
SECAM R Y: Selects secam R-Yadjustment setting is 07 in the range 00to 0F.
Time: Selects time of station tuningadjustment setting is 0B in the range 00to 1F.
PRE FM: Selects pre-FM adjustment. Setting is 00 in the range 00or 1F.
PRE NICAM: Selects pre-NICAM adjustment . Setting is00 in the range from 00to 1F.
PRE LINE IN: Selects pre-line in adjustment. Setting is 00 in the from 00to 0F.
DRAG MULTIPE: Selects drag multipe of AFT adjustment setting is 0Cin the from 00to 0F.
DRAG BASE: Selects drag base of AFT adjustment setting is 04 in the from 00to 0F.
Hi Voltage: Selects X-RAY protection leveladjustment. Setting is FF in the from 00to FF.
Bus Off: Selects I2C bus controladjustment setting is 01 in the from 00to 01.
VCO Coarse L1: Selects VCO coarse L1adjustment setting is 00.
VCO Fine L1: Selects VCO fine L1 adjustment setting is 00.
nPress [MENU] to display the Service 3 MENU.
Attn.: There is no ADJUSTMENT on this chassis.
nPress [MENU] to display the Service4 MENU.
nPress [CHANNEL UP OR DOWN] to select the highlighted item, then [VOL DOWN],or [VOL UP] to
increase or decrease the setting, The data is written to EEPROM.
nTB1238AN Adjustment Items
HPOS OSD: Selects OSD horizontal position adjustment setting is 14 in the range 00to FF.
VPOS OSD: Selects OSD vertical position adjustment setting is about 01 in the range 00to 3F.
HPOS TXT: Selects teletext horizontal position adjustment setting is 40 range 00to FF.
VPOS TXT: Selects teletext vertical position adjustment setting is 0Cin the range 00to 3F.
TXT CONTRAST: Selects screen adjustment setting is 2Ain the range 00to 3F.
G2 Adjust: Selects screen adjustment setting is 00 in the range 00to 01.
Mix Value: Selects sharpness maximum adjustment. Setting is3F in the range00 or FF.
Sync Value: Selects synchrours timing valueadjustment. Setting is 55 in the from 00to FF.
Service 3
H Size 50 --
Parabola 50 --
Trapezium 50 --
H Size 60 --
Parabola 60 --
Trapezium 60 --
Corner --
H EHT --
V EHT
--
Service 4
option 0 #80
Option 1 #19
Option 2 #98
Option 3 #C6
Option 4 #21
option 5 #86
option 6 #3C
HPOS OSD 14
VPOS OSD 01
HPOS TXT 40
VPOS TXT 0C
TXT CONTRAST 2A
G2 Adjust 00
Mix Value 3F

14
Option byte 0
The following options are available in option byte 0:
bit 7 bit 6 bit 5 bit 4 bit3 bit 2 bit1 bit 0
NTSC Comb
SW (N-com) H-out stop (H-STP) Forced ID ON (FID) ABL Gain ID sensitivity switching(id sw)
ABL start point
0 = ON
1 = OFF 0 = Normal 1 = H-out stop
& low RGB
output
0 = Normal
1 = Killer on
Fixed System
(This function
doesn’
t work on
Auto1 & Auto2
mode.)
00: -0.74V
01: -0.64V
10: -0.37V
11: -0.12V
0:normal mode
1:low mode
(This function
works on only for
NTSC mode.)
00: -0.01V
01: -0.11V
10: -0.3V
11: -0.45V
Preset: OFF Preset: Normal
Preset: Normal Preset: -0.37V Preset: Normal Preset: -0.01V
Table0Option byte 0 definitions
Option Byte 0 adjustment setting are80hex.
Option byte 1
The following options are available in option byte 1:
bit 7 bit 6 bit 5
bit 4 bit 3 bit 2 bit 1 bit 0
S-Video
RF NTSC -Stereo (Balance)
Secam function
Super Sense STV8203 Custom
Logo
0 = AV1
1 = AV2 0 = OFF
1 = ON -
0 = OFF
1 = ON 0 = OFF 1 = ON 0 = OFF 1 = ON 0 = OFF 1 = ON 0 = OFF 1 = ON
Preset: OFF
-
Preset: OFF Preset: ON Preset: OFF
Preset: ON
Preset: ON
Table 1Option byte 1 definitions
The setmaker’s logo can only be displayed if memory bank 1 is present. If this bank is present, displaying the
logo can disabled by setting bit 0high. If the memory bank is present and bit 1 is set, then the logo will be
displayed for 15 seconds, after a cold start only.
NOTE: If no text is defined for the logo in memory bank 1, this option should always be1
Option Byte 1 adjustment setting are 19hex.
Option byte 2
The following options are available in option byte2:
bit7 bit6 bit5 bit4 bit3 bit2 bit1 bit0
PIF overmod Secam adj IF freq AFT ON BGP P Ym enb
0 = OFF
1 = ON 0: Normal
1: Secam black
level alignment
mode
000: 58.75MHz
001: 45.75MHz
010: 39.5MHz
011: 38.9MHz
100: 38MHz
101: 34.47MHz
110: 33.95MHz
111: 33.9MHz
0: Normal
1: AFT Mute
off
0: Normal
1: 1.5us 0: 0~0.8V TV more than 0.8V OSD
1: 0~0.8V TV
0. 8~2.4V Half Tone
more than 2.4V OSD
Preset: ON Preset: Normal Preset: 100 Preset:
Normal Preset: 0 Preset: 0
Table 2Option byte 2 definitions
Option Byte 2adjustment setting are 98hex.

15
Option byte 3
The following options are available in option byte3:
bit 7 bit 6 bit 5 bit 4 bit3 bit 2 bit1 bit 0
1238 setting
WPS
(white Peak
Suppressor)
Blanking
SW (BLK) CW SW Market France
set
S-Video in
Mute Logic
Surround
process
0: OFF
1: ON 0: ON 1: OFF 0:BLK ON 1:BLK OFF
0:Auto
1:4.43MHz 0: OFF 1: ON 0: OFF 1: ON 0: OFF 1: ON 0: OFF 1: ON
Preset: OFF
Preset: ON
Preset: OFF
Preset: Auto
Preset: OFF
Preset: ON
Preset: ON
Preset:
OFF
Table3Option byte 3definitions
Option Byte 3adjustment setting areC6hex.
Option byte 4
The following options are available in option byte4.
bit 7 bit 6 bit 5 bit 4 bit3 bit 2 bit1 bit 0
Woofer
precess Audio processor
Volume L_R
Zwelton
Selected
RGB S-Video AV2 AV1
0: Off
1: On 0: Off 1: On 0: Off 1: On 0: Off 1: On 0: Off 1: On 0: Off 1: On 0: Off 1: On 0: Off 1: On
Preset: Off Preset:
Off Preset: On Preset: 0
Preset: 0 Preset: 0 Preset: 1 Preset: 1
Table4Option byte 4definitions
Option Byte 4adjustment setting are21hex.
Option byte 5
The following options are available in option byte5.
bit 7 bit6
bit 5 bit 4 bit3 bit2 bit1 bit 0
-Nicam EHT protect
Option Language Treat Table
-0: Off
1: On 0: Off 1: On Language Treat Table
-Preset: 1
Preset: 1
Table 5 Option byte5definitions
Option Byte 5adjustment setting are86hex.
In option byte 5, the bits 0,1and 2form a number between 0 and 7.
bit 3
bit 2
bit 1
bit 0
Op Language Treat Table
Option teletext character
0 0 0 0 English, French, Swedish, Turkish, German, Portuguese, Italian & Rumanian
0 0 1 0 Polish, French, Estonian, Czech, German, Serbain, Lettish & Rumanian
0 1 0 0 English, French, Swedish, Czech, German, Portuguese, Lettish & Rumanian
0 1 1 0 English, French, Swedish, Turkish, German, Portuguese, Lettish & Rumanian
Table 5.1 Option byte 5definitions
Option byte 6The following options are available in option byte 6.
bit 7 bit 6 bit 5 bit 4 bit3 bit 2 bit1 bit 0
MN IDK BG POWER ST TEXT
0: Off
1: On 0: Off 1: On 0: Off 1: On 0: Off 1: On 0: Off 1: On 0: Off 1: On
Preset: 0 Preset: 0 Preset: 1 Preset: 1 Preset: 1
Table 6Option byte 6definitions

16
Option Byte 0 adjustment setting are3Chex.
Specifications:
Model Refer to the Back Plate of the TV unit
Power Rating Refer to the Back Plate of the TV unit
Power Consumption
(at 220V 50Hz) Refer to the Back Plate of the TV unit
CRT 14” (370mm)
90°Deflection Angle
21” (540mm)
90°Deflection Angle
Tuning System Voltage Synthesizing Style
Antenna Impedance 75 Ohm, Unbalanced
Color System PAL/ SECAM/ NTSC3.58/ NTSC4.43 (option)
System Channel
VHF UHF CATVSystem (RF) (option)
PAL B/G
PAL D/K
SECAM B/G
SECAM D/K
CCIR
CHINA
CCIR
OIRT
2 – 12
1 – 12
2 – 12
1 – 12
21 – 69
13 – 57
21 – 69
21 – 69
X-Z+2, S1–S41
Z-1–Z-38
X –Z+2, S1 –S41
---
Video/Audio Input Terminals
Video Input: RCA type -1Vp-p, 75 Ohm
S-Video: Y/1.0V, 75 Ohm
C/0.3V, 75 Ohm
Audio Input: RCA type –400mV
Monitor Output Terminals Video Output: RCA type -1Vp-p, 75 Ohm
Audio Output: RCA type –400Mv
Audio Output: Main Speaker: 1.5+1.5W(FOR 14”) ; 3+3W(FOR 21”)(option)
Attn.: All designs and specifications are subject to change without any prior notice; dimensions and net
weight are of approximate values.
Do not attempt to fix or disassemble the unit; otherwise, you may be electrically shocked or it would
catch fire easily.

PAGE NO. 1 MAGNUM CTV-2120 TXT Time: 15:51:19 09/05/2005 (YHL) Bill of Material Listing (BM41) Model Number: CE-5429 21" CTV (FRONT CABINET :01-02046XXX-XX) Parent Code: VS-5429TST-05 Last Update ECN : DEC-18378 Level Part Number D e s c r i p t i o n Ls ECN C/O Qty UOM R e m a r k s ----- ----------- --------------------- ------ --- --- --- ------------- MODEL VS-5429TST-05 PAL BG/DK SECAM AC220V STTXT-1PG,MONO,FRONT AV IN,BACK SCART,100CH W/ ’SAMS ST
UNG’ CRT.
1 # CU-5429TST-02 COMMON PARTS UNIT - ’MAGNUM’ W/CE 1.0000 ST .2 01-73190-00 FUSE COVER CH 1.0000 PC .2 02-0104100A-00 TERMINAL PIN - (L=26.9MM X ID=2.2MM) 2.0000 PC FOR R523 .2 02-62054-07 HEAT SINK MR-0464 1.0000 PC FOR Q902 & IC301. .2 02-980390BC-00A HEAT SINK MR-0464 1.0000 PC FOR Q501. .2 04-39750-10 M 3 X 10 B/H (+) MACHINE SCREW HK 4.0000 PC 1 PC FOR Q501.
1 PC FOR IC600. 1 PC FOR Q902. 1 PC FOR IC301.
.2 05-63050-00 M3 NUT CH 4.0000 PC FOR EACH MANCHINE SRREW. .2 06-00302-00 M3 SPRING WASHER CH 4.0000 PC FOR EACH MACHINE SCREW. .2 20-60203-00 EYELET 2 X 3 HK 7.0000 PC 3 PCS FOR T901.
4 PCS FOR T501.
.2 20-70103-01 EYELET 1.5X3MM WITH COPPER-PLATE. 4.0000 PC 2 PCS FOR L903
2 PCS FOR L904
.2 50-30526-07 PNP TRANSISTOR - 2SA608KG-NP-AA0 JP 1.0000 PC Q0503 .2 50-30737-08 TRANSISTOR 2SA1013-O JP 1.0000 PC Q0507 .2 50-40706-06 TRANSISTOR 2SC1923-O MR-0465 JP 1.0000 PC Q0101
ATTN.: B,C,E PIN IS DIFFERANCE.
.2 50-40750-06 TRANSISTOR 2SC2655-Y JP 1.0000 PC Q0502 .2 50-40764-01 TRANSISTOR (BUILT-IN RESISTOR - 22K) RN 1203 JP 1.0000 PC Q0803 .2 50-AG00547B-01 TRANSISTOR BC547B NPN TYPE. HK 1.0000 PC Q0504 .2 50-AI001015-02 TRANSISTOR 2SA1015-Y 3.0000 PC Q0202 Q0204 Q0805

PAGE NO. 2 MAGNUM CTV-2120 TXT Time: 15:51:19 09/05/2005 (YHL) Bill of Material Listing (BM41) Model Number: CE-5429 21" CTV (FRONT CABINET :01-02046XXX-XX) Parent Code: VS-5429TST-05 Last Update ECN : DEC-18378 Level Part Number D e s c r i p t i o n Ls ECN C/O Qty UOM R e m a r k s ----- ----------- --------------------- ------ --- --- --- ------------- CONT.> CU-5429TST-02 COMMON PARTS UNIT - ’MAGNUM’ W/CE 1.0000 ST .2 50-DY001015-01 TRANSISTOR TYP:A1015Y MR-0469 CH 1.0000 PC Q0603 .2 50-DY001815-01 TRANSISTOR TYP:C1815Y MR-0469 CH 7.0000 PC Q0201 Q0203 Q0211 Q0601 Q0801 Q0802 Q0804 .2 51-02004-40 ZENER DIODE - GZA12X (11.40 - 11.95V) PACKAGING : TAPE TYPE CH 1.0000 PC D0904 .2 51-02023-40 ZENER DIODE CH05W5.1 - 5.1V 0.5W (4.97-5.18V) CH 1.0000 PC D0220 .2 51-02060-56 ZENER DIODE 4A2 (3.6V, 0.5W) CH 1.0000 PC D0815 .2 51-02082-05 ZENOR DIODE BZX79C 5V6 5.6V MR-0469 HK 1.0000 PC D0506 .2 51-02088-05 ZENOR DIODE BZX79C 6V8 6.8V MR-0469 HK 1.0000 PC D0504 .2 51-02089-05 ZENOR DIODE BZX79C 9V1 9.1V MR-0469 HK 1.0000 PC C0925
ATTN: THE POSITIVE POLE CONNECTED TO THE GROUND.
.2 51-03058-41 DIODE 1N4007 CH 4.0000 PC D0515 D0516 D0517 D0518 .2 51-03071-05 DIODE BYV95B HK 1.0000 PC D0507 .2 51-03075-68 RECTIFIER DIODE - FR154 HK 3.0000 PC D0508 D0510 D0511 .2 51-03079-71 RECTIFY DIODE. TYPE: FR104 MR-0469 HK 4.0000 PC D0301 D0302 D0501 D0903 .2 51-08001-23 DIODE 1N4148 IT 15.0000 PC D0201 D0205 D0206 D0207 D0224 D0225 D0226
D0502 D0503 D0505 D0520 D0603 D0801 D0809 ATTN:DIODE CONNECTED TO R835 ON THE BOTTOM SIDE,
AND THE POSITIVE PIN CONNECTED TO C807.
.2 52-A1220EJ12-AP 22 OHM 1/6W +-5% CARBON FILM RESISTOR (RT13A TYPE) 1.0000 PC R0503 .2 52-A1270EJ12-AP 27 OHM 1/6W +-5% CARBON FILM RESISTOR (RT13A TYPE) 1.0000 PC R0102 .2 52-A1750EJ12-AP 75 OHM 1/6W +-5% CARBON FILM RESISTOR (RT13A TYPE) 2.0000 PC R0107 R0202 .2 52-A2100EJ12-AP 100 OHM 1/6W +-5% CARBON FILM RESISTOR (RT13A TYPE) CH 10.0000 PC R0106 R0207 R0209 R0217 R0218 R0219 R0234
R0250 R0823 R0834
.2 52-A2150EJ12-AP 150 OHM 1/6W +-5% CARBON FILM RESISTOR (RT13A TYPE) CH 1.0000 PC R0235 .2 52-A2220EJ12-AP 220 OHM 1/6W +-5% CARBON FILM RESISTOR (RT13A TYPE) CH 2.0000 PC R0213 R0237

PAGE NO. 3 MAGNUM CTV-2120 TXT Time: 15:51:19 09/05/2005 (YHL) Bill of Material Listing (BM41) Model Number: CE-5429 21" CTV (FRONT CABINET :01-02046XXX-XX) Parent Code: VS-5429TST-05 Last Update ECN : DEC-18378 Level Part Number D e s c r i p t i o n Ls ECN C/O Qty UOM R e m a r k s ----- ----------- --------------------- ------ --- --- --- ------------- CONT.> CU-5429TST-02 COMMON PARTS UNIT - ’MAGNUM’ W/CE 1.0000 ST .2 52-A2330EJ12-AP 330 OHM 1/6W +-5% CARBON FILM RESISTOR (RT13A TYPE) CH 1.0000 PC R0252 .2 52-A2430EJ12-AP 430 OHM 1/6W +-5% CARBON FILM RESISTOR (RT13A TYPE) CH 1.0000 PC R0902 .2 52-A2560EJ12-AP 560 OHM 1/6W +-5% CARBON FILM RESISTOR (RT13A TYPE) CH 1.0000 PC R0225 .2 52-A3100EJ12-AP 1 KOHM 1/6W +-5% CARBON FILM RESISTOR (RT13A TYPE) CH 10.0000 PC R0103 R0105 R0222 R0223 R0226 R0243 R0248
R0505 R0838 R0856
.2 52-A3100FJ12-AP 1 KOHM 1/4W +-5% CARBON FILM RESISTOR (RT14 TYPE) CH 3.0000 PC R0302 R0307 R0314 .2 52-A3220EJ12-AP 2.2 KOHM 1/6W +-5% CARBON FILM RESISTOR (RT13A TYPE) CH 4.0000 PC R0212 R0224 R0233 R0236 .2 52-A3220FJ12-AP 2.2 KOHM 1/4W +-5% CARBON FILM RESISTOR (RT TYPE) CH 1.0000 PC R0915 .2 52-A3270EJ12-AP 2.7 KOHM 1/6W +-5% CARBON FILM RESISTOR (RT13A TYPE) CH 1.0000 PC R0502 .2 52-A3270GJ12-AP 2.7 KOHM 1/2W +-5% CARBON FILM RESISTOR (RT15 TYPE) 1.0000 PC R0901 .2 52-A3330EJ12-AP 3.3 KOHM 1/6W +-5% CARBON FILM RESISTOR (RT13A TYPE) 5.0000 PC R0205 R0215 R0216 R0506 R0833 .2 52-A3470EJ12-AP 4.7 KOHM 1/6W +-5% CARBON FILM RESISTOR (RT13A TYPE) CH 1.0000 PC R0204 .2 52-A3560EJ12-AP 5.6 KOHM 1/6W +-5% CARBON FILM RESISTOR (RT13A TYPE) CH 3.0000 PC R0104 R0511 R0514 .2 52-A3680EJ12-AP 6.8 KOHM 1/6W +-5% CARBON FILM RESISTOR (RT13A TYPE) CH 1.0000 PC R0608 .2 52-A4100EJ12-AP 10 KOHM 1/6W +-5% CARBON FILM RESISTOR (RT13A TYPE) CH 12.0000 PC R0221 R0268 R0524 R0801 R0803 R0827 R0828
R0829 R0837 R0908 R0910 R0922
.2 52-A4150EJ12-AP 15 KOHM 1/6W +-5% CARBON FILM RESISTOR (RT13A TYPE) 2.0000 PC R0507 R0855 .2 52-A4220EJ12-AP 22 KOHM 1/6W +-5% CARBON FILM RESISTOR (RT13A TYPE) 8.0000 PC R0238 R0504 R0618 R0841 R0842 R0844 R0851
R0852
.2 52-A4220GJ12-AP 22 KOHM 1/2W +-5% CARBON FILM RESISTOR (RT15 TYPE) 1.0000 PC R0843 .2 52-A4220GJ12-AX 22 KOHM 1/2W +-5% CARBON FILM RESISTOR (RT15 TYPE) CH 1.0000 PC R0528 .2 52-A4300EJ12-AP 30 KOHM 1/6W +-5% CARBON FILM RESISTOR (RT13A TYPE) 1.0000 PC R0203 .2 52-A4330EJ12-AP 33 KOHM 1/6W +-5% CARBON FILM RESISTOR (RT13A TYPE) CH 1.0000 PC R0208 .2 52-A4390FJ12-AP 39 KOHM 1/4W +-5% CARBON FILM RESISTOR (RT14 TYPE) 1.0000 PC R0303