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 specified limit.
The nominal value of the high voltage of this receiver is about 30.4 kV at zero beam current (minimum
brightness) under 175-245V AC power source.
The high voltage must, under any circumstances, not exceed about 36kV.
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.
Picture tube high voltage anode cap
High impedance and high voltagh meterChassis
Picture tube ground
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 characteristics which would affect X-RAY
RADIATION protection. For safety, parts replacement should be carried out only after referring to the
"PRODUCT SAFETY NOTICE" below.
PRODUCT SAFETY 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-RAYRADIATION.
2
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.
l The CPU mainly operates data transmissions and also generates clock signal.
l The CPU also controls all sub-IC chips, making them work.
(2). I2C Bus Application in this TV unit
SDA
SCL
SDA
SCL
SDA
SCL
In this TV unit, ICU1 is the main chip while ICU2, IC101 and other chips are regarded as sub-chips.
2.1 ICU1 (CPU) controls the functions of IC101 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 ICU2 via the I2C bus.
SAFETY PRECAUTION
1. High voltage of 27-32kV 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 to keep 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 film resistor) 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 pin power outlet.
Check and adjust all the customer controls such as BRIGHTNESS, CONTRAST and COLOUR to obtain natural
color or B/W picture.
3
AUTOMATIC DEGAUSSING :
Input Terminals (Video),
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.
LOCATION OF CONTROLS AND SWITCHES
Front View (Front Configuration)
(2)Groups 2 of Audio/Video Input
Terminals (Video), (Audio), (L/Mono),
S-VIDEO
AUDIO
R
3
AUDIO
2
VIDEOL/MONO
:
SUPER WOOFER
MENU
Button
Rear View (Back Configuration)
ON
OFF
Headphone Jack
(3.5mm Dia, 16ohm)
MENU
SUPER WOOFER 8
EXT. SPEAKER 8
+
R
AUDIO(MONITOR)AUDIOVIDEOVIDEO
R
INT.
EXT.
MENU
L
Standby
(Red)
Super Woofer Out Terminals
Main Speakers Output Terminals
+
L/MONOL/MONO
R
Power
(Green)
Speaker Switch (EXT/INT)
(1)Group of Audio/Video
(Audio), (L/Mono),(R)
(Monition) Tv Out Terminals
(Video), (Audio), (L/Mono),(R)
4
Remote Control Unit
There are 38 buttons on the remote control. 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.
*16-17 (FOR GERMAN STEREO ONLY)
*19-36 (FOR TELETEXT ONLY)
1. NUMBER (0-9) BUTTONS
2. PROGRAM (UP/DOWN) BUTTONS
3. AV BUTTON
4. TV BUTTON
5. STANDBY BUTTON
6. PERSONAL PREFERENCE BUTTON (PP)
7. SOUND MUTING BUTTON
8. STATUS BUTTON
9. VOLUME (UP/DOWN) BUTTONS
10. MENU BUTTON
11. RED (PICTURE MENU) BUTTON
12. GREEN (SOUND MENU) BUTTON
13. YELLOW (OTHER MENU) BUTTON
14. CYAN (INSTALL MENU) BUTTON
15. WHITE (TIME MENU) BUTTON
16. STEREO/MONO & DUAL I/II BUTTON
17. EFFECT BUTTON
18. SWAP BUTTON
19. SUBTITLE BUTTON
20. TXT. BUTTON
21. MIX. BUTTON
22. CANCEL BUTTON
23. HOLD BUTTONSIZE BUTTON
24. SIZE BUTTON
25. REVEAL BUTTON
26. TIME BUTTON
27. SUBCODE BUTTON
28. DIGIT ENTRY (0-9) BUTTONS
29. PAGE NUMBER UP / DOWN BUTTONS
30. PREVIOUS BUTTON
31. TOP/FLOP/SIMPLE BUTTON
32-35. COLOR BUTTONS
36. WHITE (INDEX) BUTTON
37. SERVICE BUTTON
28
29
37
16
17
21
20
24
23
19
11
12
13
14
15
10
22
18 31
30
26 27
25
32
33
34
35
36
5
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
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 5 pieces of screw (A) used in fixing the antenna jack plate on the back cabinet.
3. Loosen the 9 pieces of screw (B) used in fixing the back cabinet to the front cabinet; then remove the back
cabinet.
Screws(B)
Screws(A)
Fig.2
METHOD OF REMOVING MAIN CHASSIS (see Fig. 3 & 4)
After removing the back cabinet, proceed the following procedures accordingly.
1. To avoid electric shock hazard, discharge the highFig.3
voltage potential from the picture tube anode
several times by short-circuiting the positive anode
of the picture tube with its ground before detaching
the high-voltage anode cap.
2. Unsolder and detach the ground wire of the picture
tube from the picture tube socket board.
3. Detach the picture tube socket board.
4. Detach the high-voltage anode cap.
5. Unplug Socket F, U, V, A, B, K or X and P.
6. Take out the chassis from the chassis holder.
High-volotage anode cap
Picture tube socket board
Screws(B)
6
METHOD OF REMOVING PICTURE TUBE (see Fig. 4)
MAIN CHASSIS PC BOARD
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 the lugs 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" at
Page 2 & 3 of 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 electric shock 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.
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
VRC2
VRC1
E-W CORRECTION PC BOARD
7
T902
VR 501
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 of 50V Ceramic type except those listed below. The unit of measure for capacitor is
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 supply circuit.
(1) To avoid electric shock hazard, never touch the "HOT" and "COLD" circuit simultaneously.
(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 the
same 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.
8
TEST EQUIPMENT :
EQUIPMENTSPECIFICATION
High Impedance VoltmeterHaving an impedance of at least 100 Kohm.
OscilloscopeVolt sensitivity over 10mV input impedance over 1
Sweep/Marker GeneratorOutput adjustable to at least 0.1 volts rms.
Colour Bar GeneratorWith functions: BAR/DOT/SQUARE/SYSTEM
Power Supply
AC/DC VoltmeterHigh sensitive (better use digital voltmeter)
Isolation Transformer
ProbeLow-capacitance / High impedance.
Mohm, below 10PF.
SELECT/VIDEO OUTPUT TERMINAL/CROSS-
HATCH/S-VIDEO OUTPUT TERMINAL functions and
green or red purity signal.
Source such as a battery or a well regulated and isolated
DC bias supply. (Adjust 0-20V)
Voltage adjustable type having capacity of more than
200 watts.
FM/AM Signal GeneratorNational ; 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 125V (CE-6401/6418/6409/7405)/ 124V(or)140V (CE-7406)/ 145V (CE-8608)/
115V (CE-8616) POSITIONS.
1. Check the AC line voltage supplied is AC220V +-5% 50 Hz.
2. Turn in an active channel, adjust BRIGHTNESS and CONTRAST controls to obtain a normal picture.
3. Connect test point (C523) on the MAIN CHASSIS PCB with high impedance DC voltmeter.
4. Adjust VR501 (on the MAIN PCB) for B+ 125V +/-0.3V (CE-6401/6418/6409/7405)/ 124V(or)140V +/-
0.3V(CE-7406)/ 145V +/-0.3V(CE-8608)/ 115V +/-0.3V(CE-8616) voltage reading.
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 below 35KV.
d. Adjust the BRIGHTNESS Control to both extremes to ensure the high voltage does not
exceed the limit of 34Kv under any circumstances.
FS CIRCUIT CHECK:
a. Push the Power Switch on and adjust all controls for normal operation.
b. Temporarily connect a 18Kohm resistor across R908 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.
9
FOCUS ALIGNMENT :
Tune in an active channel or Phillips Pattern. Adjust the Focus control on the FLYBACK
TRANSFORMER (T902) for well defined scanning lines in the center area on the screen.
SCREEN VOLTAGE (VG2) ADJUSTMENT
Apply a FULL BLACK signal with a colour bar signal generator.
Connect oscilloscope to measure pin of R132, R133 or R134 (Vbcmp) on the main board. Vbcmp means
DC-level of the black current measurement pulse.
Turn the CONTRAST and BRIGHTNESS controls to normal positions.
Turn the SCREEN VR anti-clockwise to get the minimum value.
Then turn the SCREEN VR clockwise slowly to get the reading of the DC-level at the RGB-output is 3.3V.
ATTN.: CE-7407 of SCREEN VOLTAGE adjustment reading of the DC-level at the RGB-output is 3.3V or
Screen Voltage is about DC 400V.
HORIZONTAL POSITION ADJUSTMENT
a. Receive the Phillips Pattern. Apply a crosshatch signal.
b. Set the contrast and colour to their minimum, and the brightness to its maximum.
c. Adjust (H-SHIFT) to move the picture at the center.
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.
VERTICAL ADJUSTMENT
Apply a crosshatch signal.
Adjust (V-SLOPE) to obtain half picture.
Adjust (V-S.CORR) to obtain a linear picture.
Adjust (V-SHIFT) to move the picture at the center.
Adjust (V-AMPL) 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.
PICTURE WIDTH AND PINCUSHION DISTORTION ADJUSTMENT :
a. Perform this adjustment after the B+ volts and the Hor. CENTER adjustment are completed.
b. Receive a Phillips Pattern.
c. Set the contrast and colour to the minimum, and the brightness to the maximum.
d. Adjust the H. WIDTH Control (VRC2) for the horizontal width so that the white flags on the left and
right of the pattern just hide.
e. Adjust the DPC Control (VRC1) to correct the vertical line on left and right straight.
f. Readjust the WIDTH Control (VRC2) for the precision.
DELAY AGC ADJUSTMENT :
Apply a 60dbu level with standard colour bar signal to the antenna input.
Connect the probes of the high impedance DC voltmeter to C156.
Adjust (AGC-ADJ) to get the reading of 4 - 5V till obtaining a clear picture.
Apply a white balance alignment signal with the white balance checker.
Adjust brightness and contrast suitable for the adjustment.
Adjust (R-GAIN), (G-GAIN) and (B-GAIN) to obtain a 9300 K colour temperature.
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 partLocations
1.Antenna Terminal Back Cabinet
2. AV input TerminalsFront / Back Cabinet
3. AV output Terminals Back Cabinet
3.Enclosure ScrewsBack Cabinet
4. S-Video SocketsFront Cabinet
5. Ext. Speaker TerminalsBack Cabinet
SOUND IF ALIGNMENT (BG-38.9MHz)
a. Apply IF signal (38.9 MHz, 10mV) to Pin 1 of D socket.
b. Set a signal generator to colour bar and dual transmission with internal modulation of 3 KHz on channel
1 and 1 KHz on channel 2.
c. Connect oscilloscope to pin 15 of ICF1 (TDA3857).
d. Align the 38.9MHz coil (LF4) for minimum picture contents.
a. Set transmitter to dual sound mode and off the main sound modulation.
b. Adjust (LF5) 5.74MHz tank coil to minimum THD.
c. Set transmitter to BG mono sound mode, connect the dual vertical input of the oscilloscope to RF17
(MAIN SOUND) 5.5MHz and RF15 (SUB SOUND) 5.74MHz.
d. Adjust (LF6) 5.5MHz tank coil to minimum THD.
e. Change the sound to D/K system, adjust (LF7) 6.5MHz tank coil to minimum THD.
f. Re-align LF6 and LF7 to minimum THD both.
GERMAN STEREO FILTER COIL (LF8)
a. Set a signal generator to colour bar, stereo sound mode and off the main sound modulation (5.5 MHz
signal).
b. Connect the oscilloscope to Pin 5 of ICF2.
c. Adjust FILTER COIL (LF8) for the maximum reading on the oscilloscope (envelope waveform) with
the minimum distortion.
11
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-GAIN) and (B-GAIN) to provide only a green raster.
Advance the GREEN bias control (G-GAIN) 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. 9 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.
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 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 for a 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 area of 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 adjustments c,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 :
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 remove the 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.
12
DEFLECTION YOKE
RUBBER
WEDGES
PURIIY AND
CONVERGENCE
MAGNET ASS Y
33 mm
(1-5/16 )
TEMPORARY
MOUNTING
30
30
RUBBER WEDGES
LOCATION
Figure 8
30
DEF.YOKE
RUBBER WEDGE
ADHESIVE
4-POLE MAGNETS
PURITY MAGNETS
6-POLE
MAGNETS
CONVERGE MAGNET ASSEMBLY
BLU RED
BLU
RED
4-Pole Magnets Movement
Center Convergence by Convergence Magnets
R
G
B
R
G
B
ADJUST THE ANGLE
(VERTICAL LINES)
ADJUSTMENT OF MAGNETS
Figure 9
ROTATE TWO TABS
AT THE SAME TIME
(HORIZONTAL LINES)
BLU
RED
/
RED
BLU
/
6-Pole Magnets Movement
FIXED
GRN
Incline the Yoke up (or down)Incline the Yoke right (or left)
Circumference Convergence by DEF Yoke
Fig .10 Dot movement Pattern
13
FACTORY ADJUSTMENT MODE:
General
All available options are devided over 4 option bytes, which can be set in the service menu. To activate
the service menu, RC-5 code 58 with system address7 should be transmitted to the system. When the
Service menu is activated, pressing the Status-key will bring up option byte 0. The menu left/right keys
will change the value of the option byte down or up respectively. Pressing the Menu Up key will bring up
the next option byte, option byte 1.
Note, that the four option bytes are not part of the overall service menu carrousel or even part of an own,
“option byte” carrousel. When the last option byte has been entered and menu up is pressed, the first item of
the service menu will be activated again. Pressing menu-down, when any of the option bytes 1..3 is active
will bring up the previous option byte. Pressing menu-down when option byte 0 is present, will bring up the
last item in the service menu carrousel.
Note, that the option bytes are represented in binary notation and that the Least Significant Bit (LSB, bit 0)
is the most right-hand bit.
Note, that bits marked as reserved are used by other members of the
CTV27X family of TV control systems.
In case the user should forget the password that has been entered, there is a “built-in” password,
that will always work: 759.
Option byte 0
bit 7bit 6bit 5bit 4bit 3bit 2bit 1bit 0
Opt StoreUp Opt
Auto store
up
(1..99)
1=Auto
store
starts at
program 1
0=Autostore
starts at
program 99
Table 5.1 Option byte 0 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 1 low. 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 be 0
Option Byte 0 adjustment setting are 10000001.
The following options are available in option byte 0.
Opt Standby Opt TunerOpt
FColorOn
Forced
Color
on
1=Auto
Color killing
disabled
0=Auto
Color killing
enabled
reserv. Standby after
power on
-1=Al. ways
goto standby
after power
on
0=power on
mode depends
on last status
UV1316tuner
type
1=UV1316M
K2
0=Old
UV1316
Logo
reserv. Display
Logo
-1=displ
ay
0=don’t
display
Opt
Stereo
Simple
Stereo
1=prese
nt
0=not
present
14
Option byte 1
bit 7
bit 0
Opt SChannels
Op Chan Table
used
Video Chip
reserved
not used
not used
Channel Table
bit 5
Opt Pall
Opt PalDK
NTSC-BG
NTSC-M
SECAM-DK
SECAM-BG
PAL-I
PAL-DK
PAL-BG
The following options are available in option byte 1:
not
bit 6bit 5bit 4bit 3bit 2bit 1
Opt
TDA884X
S-channels
-1=TDA884X -1= S-channels
- -
included
0= S-channels
not included
Table 5.2 Option byte 1 definitions
In option byte 1, the bits 0 and 1 form a number between 0 and 3.
bit 1 bit 0
Op Chan Table
Not used for VST tuners
0 0CCIR
0 1 UK
1 0 OIRT
1 1 Illegal
Table 5.3 Option byte 1, bits 0 and 1 determine channel table
Note, that when a VST tuner is installed, the option bits for
Channel Table have no meaning.
Option Byte 1 adjustment setting are 01010000.
Option byte 2
Option byte 2 is used entirely to set the available color and sound standards.
Note, that the available systems set here must match the installed Xtal’s for the video one-chip and sound
traps.
bit 7bit 6
Opt
NtscBG
Opt
NtscM
bit 4bit 3bit 2bit 1bit 0
Opt
SecamDK
Opt
SecamBG
Opt
PalBG
Not
used
1=present
0=not
present
1=presen
t
0=not
present
-1=present
0=not
present
1=present
0=not
present
1=presen
t
0=not
present
1present
0=not
present
1=present
0=not
present
Table 5.4 Option byte 2 definitions
Option Byte 2: 1. Adjustment setting are 01000001 for PAL-BG and NTSC-M.
2. Adjustment setting are 01000011 for PAL-BG/DK and NTSC-M.
3. Adjustment setting are 01011011 for PAL/SECAM-BG/DK and NTSC-M.
15
Option byte 3
bit 7
bit 6
bit 5
Opt Nr Of AV
Opt Blueback
Opt VhfH
Opt 24Hr
VHF-L band
The following tables show the options in the last of the option bytes.
reserve
d
-
Bits 5 and 6 form a pair to indicate the number of available AV (external) sources.
bit 4bit 3bit 2bit 1bit 0
Opt VhfLOpt Vid
Mute
Blue
background
VHF-H
band
Video mute
if
Chan.
change
1=blue
background
0=no blue
1=present
0=not
present
1=present
0=not
present
1=mute
0=no mute
background
Table 5.5 Option byte 3 definitions
bit 6bit 5
24 hr
clock
1=24 hour
0=AM/PM
OptNrOfAV
00 No external source
01 AV-1 only
10 AV-1 and AV-2
11 AV-1 and AV-2 and S-VHS
Table 5.6 Option byte 3, Number of AV sources
Option Byte 3 adjustment setting are 01111111 for AV-1 and AV-2 and S-VHS.
Option Byte 3 adjustment setting are 01011111 for AV-1 and AV-2.
Cathode drive level adjust (CL-ADJ)
For variation of the cathode drive level at he CRT three IIC bits CL2, 1,0 are added. The table below gives a
survey of the cathode drive levels:
CL-ADJ
Variation Cathode Drive
057V
163V
270V
377V
484V
591V
699V
7107V
Measuring conditions:
Brightness are set to their nominal value. As test signal is used a black field with white block. The measured
cathode drive voltages have a tolerance of +/- 3V.
16
7 Service and Factory mode
Factory mode
When the service contact (pin 35) of the microprocessor is shorted to ground for 250 ms but not longer
than 500 ms, CTV272V2 will show the service menu. In the service menu, configuration and geometry
parameters can be modified (service alignment), using the remote or local keyboard. In service mode, the
EVG-bit of the video one-chip is cleared to 0, to avoid RGBOUT blanking when the vertical deflection fails,
for easier repair. To indicate that the service menu is active, CTV272V2 will display the following OSD
message:
CTV272V2
VERSION XX.YY
H-PARAB. 33 09-63
Figure 7.1 Service menu OSD
The OSD shows the identification of the TV system CTV272V2 and it’s version number in XX.YY
format. An example of a version number is 00.04.The lowest line shows one of the alignment parameters.
This is also the position on which the parameters will be shown when the service menu is active. There
will only be one alignment parameter active at any given time. The alignment parameter consists of it’s
name (refer to chapter on the service menu for details), it’s current value and the range in which the value
can be altered.
When the short circuit lasts longer than 500 ms, CTV272V2 will enter Factory mode. The continuous
update via the I2C bus and OSD’ s are suppressed. A factory computer can then write to the non-volatilememory. When a command from the local or remote keyboard is received, all devices are updated and the
processor stops again. In this way, all non I2C bus controlled outputs of the microprocessor can still be
controlled.
In factory mode, the setmaker’ s logo can be set, if the optional memory bank 1 is present. In this memory
bank 40 bytes are available for the logo text. The characters for the logo text are NOT packed, like the
characters for the program names. Any of the characters as described in the chapter on the user interface
can be used. The logo text will be printed in two lines, the first line has a maximum of 20 characters, the
second line has a maximum of 16 characters. If both lines are to be used, the upper line has to be filled out
with ‘ Space’ characters. There is no New Line character available, this will be inserted automatically
after 20 characters have been read from the non-volatile memory.
The logo text can be ‘ ended’ by either filling the remainder of the 40 bytes with spaces, or by inserting
an EOL (End-Of-Logo) character. When the software reads an EOL character, the logo text will be
regarded as finished.
The service line of the microprocessor is also used as a “ write protect” line for the non- volatile
memory. Any of the non-volatile memory IC’s used can either be connected to this line or have their write
protect pin (if applicable) fixed to ground. Prior to any write access to the non-volatile memory, the
microprocessor will pull the service pin low.
17
Service Alignment
The service menu can also be activated by sending RC-5 code 58 with system address 7. When the
service menu is activated, the Menu Up/Down keys will select the next item, while the Menu Left/Right
keys will change the value of the item currently on screen. The following alignments can be set.
- Hotel Mode :Maximum Volume HM VOL setting is 00 0-63
- Hotel Mode :Initial ProgramHM INI-P setting is 00 0-99
3 Horizontal shift 1)H-SHIFT setting is 34 0-63
2 E-W width 1)H-WIDTH setting is 31 0-63
1 E-W parabola 1)H-PARAB setting is 31 0-63
8 E-W corner 1)H-CORNER setting is 31 0-63
9 E-W trapezium 1)H-TRAP setting is 31 0-63
5 Vertical slope 1)V-SLOPE setting is 25 0-63
6 Vertical amplitude 1)V-AMPL setting is 41 0-63
4 Vertical S-correction 1)V-S.CORR setting is 12 0-63
7 Vertical shift 1)V-SHIFT setting is 36 0-63
Red Red gainR-GAIN setting is 31 0-63
Green Green gainG-GAIN setting is 31 0-63
Blue Blue gainB-GAIN setting is 31 0-63
White Cathode drive level adjustCL-ADJ setting is 02-04 0-7
Size IF-PLL adjust 2)IF-PLL/AFC setting is 02 0-3
Reveal AGC adjust )AGC-ADJ setting is 02-07 0-63
Time Y-delay system 3)Y-DELAY setting is 04 0-8
CANCEL VSD alignment 5)VSD setting is 00 0-1
PP Stereo balanceSTER BAL setting is 24 0-49
- VHF-L step size A4)VHFL A setting is 78 0-128
- VHF-L step size B4)VHFL B setting is 18 0-128
- VH F L step size C4)VHFL C setting is 06 0-128
- VHF H step size A4)VHFH A setting is 39 0-128
- VHF H step size B4)VHFH B setting is 09 0-128
- VHF H step size C4)VHFH C setting is 03 0-128
- UHF step size A4)UHF A setting is 26 0-128
- UHF step size B4)UHF B setting is 06 0-128
- UHF step size C4)UHF C setting is 02 0-128
- VHF-L delay time A4)VHFL A DL setting is 40 0-128
- VHF-L delay time B4)VHFL B DL setting is 40 0-128
- VHF-L delay time C4)VHFL C DL setting is 40 0-128
- VHF-H delay time A4)VHFH A DL setting is 40 0-128
- VHF-H delay time B4)VHFH B DL setting is 40 0-128
- VHF-H delay time C4)VHFH C DL setting is 40 0-128
- UHF delay time A4)UHF A DL setting is 40 0-128
- UHF delay time B4)UHF B DL setting is 40 0-128
Mute UHF delay time C4)UHF C DL setting is 40 0-128
1) 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.
18
2) The TDA884x supports an alignment free IF-PLL.
The required IF- frequency can be set by adjusting the IF- PLL value according the table below:
IF-PLL value IF- Frequency
0 58.75 MHz
1 45.75 MHz
2 38.90 MHz
3 38.00 MHz
3) This setting should be repeated for any of the possible color standards in the TV – system, since this
parameter is recalled or set, depending on the currently selected color standard.
4) VST tuners only.
5) VSD alignment, when there is no vertical deflection, the remaining horizontal line can be used for
simplified Vg2 alignment
0: Vertical scan active (normal operation)
1: Vertical scan disabled
6) Stereo balance (STER BAL) setting is adjusted separation of German Stereo.
a. Set a signal generator to colour bar, stereo sound mode and off the main sound modulation (5.5
MHz signal).
b. Connect the high impedance voltmeter to L speaker output.
c. Adjust STER BAL for the maximum reading (unit of dB) on the voltmeter of the stereo separation.
Table 7.1 Basic service alignments
When a VST tuner is used, the search tuning algorithm uses three different step-sizes when
searching a transmitter (refer to VST tuning for details). These step-sizes are called Step A, Step B and
Step C. Step A is the largest step (approximately 1 MHz), Step C is the smallest step (approximately
62.5 kHz). Measured in frequency, these steps should be approximately equal for all three bands.
However, the tuning voltage applied to the tuner results in different frequencies for each band.
Therefore, the step-sizes should be set for each step in each band individually. Note, that the software
will not set default values, after a new non-volatile memory is installed. If a UV1315 VST tuner is used,
the following values for the step-sizes will give good tuning results:
Step Value
VHF-L A 78
VHF-L B 18
VHF-L C 06
VHF-H A 39
VHF-H B 09
VHF-H C 03
UHF A 26
UHF B 06
UHF C 02
Table 7.2 Possible step-sizes for UV1315 VST tuner
19
For different tuners it may be necessary to obtain different values. In order to stabilize the tuner, the
tuning algorithm will wait for a certain time after each step. This time is the tuning delay time, which
can be set for each step-size in each band. The delay time set in the non-volatile memory is directly
measured in milliseconds. The tuning algorithm itself has an update time of 40 ms, so it is useless to set
the delay times to less than 40 ms. Also, for the UV1315 tuner, 40 ms is a value, which will produce
good search tuning results. For different tuners it may be necessary to obtain different values.
The four option bytes can also be changed via the service menu. These are however not part of the
service parameter carrousel, as shown in the previous table. The following table shows the OSD for the
four option bytes.
Notation is in binary format, so that it is easy to see which option bits are set. Refer to the optionsection for a detailed description of the option bytes.
Table 7.3 Option bytes
Each of the option bytes can also be “ stepped to” by means of the Menu Up key, provided the first
option byte is at that moment on screen. Pressing Menu Up when the last option byte is active, will step
to “ Horizontal shift”. Using Menu down is also possible when the option bytes are on screen, to step
back through the option bytes. If option byte 0 is active when Menu Down is pressed, will step back to
UHF delay time C.
When a new non-volatile memory is installed, it’s contents may have random values, which do not
fit in the range, as set by table 7.1. The software will also not check on this situation and set
appropriate default values. It is up to the service engineer or the factory to bring the service
alignment values into range. Once the values have been set to a proper, in range value, it is no
longer possible to set a value out of range. The software will check on ranges, when the alignment
values are changed.
Hotel Mode
Hotel mode can only be set from within the service menu. The reason for this is that a separate
menu with a security code is never safe enough. It is always possible, that either willingly or by
accident hotel customers activate the Hotel Mode Menu and change any of the settings. The service
menu however can only be activated by a special remote control device or by activating the service
pin of the micro-controller.
The parameters that set Hotel Mode are always the first two items in the service menu. Therefore,
a hotel technician, setting hotel mode in the service menu does not need to know all the details about
the TV alignments. The hotel technician only needs to know that the first two parameters can safely
be set and that the service menu should be left after the necessary settings have been made.
When Hotel Mode is active, the micro-controller will not be able to write any of the settings in the
system into the non-volatile memory. The only settings that can be written are the Maximum
Volume and the Initial Program of hotel mode. The Installation menu is not available in hotel mode.
This also means, that programs that have been cleared, prior to setting hotel mode, can not be
returned. The lock status of programs will be ignored. Also, in the Others menu, the Password item
is not available when hotel mode is ON. Effectively, this means that locked programs are unlocked
when hotel mode is on.
20
Any of the analog settings (volume, balance, brightness, contrast etc.,) can be changed, but these
changes will only have effect as long as the TV is switched on. After going to standby, or powering
down and up, the settings from the non-volatile memory will be recalled. Therefore, analog settings
that the system should start up with should be set and stored as Personal Preset prior to setting
hotel mode itself.
Hotel mode will be activated, as soon as the value for the maximum volume (HMVOL) is set to a
value unequal to 0. The maximum value the analog volume can have is 63, which in normal
operating conditions is visualized by a bargraph, in the most right position. Every dash in the
bargraph corresponds to 4 increments in volume. The value for the maximum volume can be set
from 0 to 63 and is wrapped around from 0 to 63 with the Menu Left key or wrapped around from
63 to 0 with the Menu Right key. This feature can be used to help setting the maximum volume to an
acceptable value.
First, make sure the maximum volume is set to 0, which also means hotel mode is off. Set the
volume level to an acceptable maximum value, by means of the Sound menu or the Volume + local
or remote key. The activate the service menu and start setting the maximum volume by using the
Menu Left key. The will start the maximum value at the value of 63 and sets hotel mode active.
Continue decrementing the maximum volume, until the volume at the loudspeakers starts to
decrease. This is then the maximum level that can be set by the hotel customer. Another way of
setting the maximum volume is just by setting a value, without the help of any audible effects.
The initial program is the number of the program. That the TV set will power up with, either from
power down or standby. For all versions of the CTV27xxx package, the maximum number that can
be set here is 99, also for versions that have less than 99 programs. Care should be taken to select
an existing program at this location, because the system will bring value in range if necessary. The
initial program in that case is then unequal to the one set at Initial Program.
When factory alignment is performed, this can either be done by a factory computer or by hand by a
factory technician. In the first case, the microprocessor will have to be put in factory mode, so the
factory computer will be able to write to the non-volatile memory without any problems. Make
sure however, to write 0 in the HM VOL service parameter to allow analog setting to be written
into the non-volatile memory.
In the second case, the factory technician must make sure, that the service parameter HM VOL
(Hotel Mode maximum Volume) is set to 0. If this is not the case, also the alignment parameters
will NOT be written into non-volatile memory, even though the new setting are written the
corresponding components (e.g. video one-chip) of the system! If alignment parameter are changed
while the hotel mode is active, powering the system down and up will restore the previous
parameters as recalled from non-volatile memory.
21
8
1
2
6
3
5
8
3
2
6
3
3
4
3
4
2
3
C
Y
7
22
9
0
1
CIRCUIT DIAGRAM (REMOTE CONTROL)
CAUTION:
The international hazard symbols and shaded area in the schematic diagram and parts list
designate component which have special characteristics important for safety and should
be replaced only with the types identical to those in the original circuit or specified in the
parts list. The mounting position of replacement parts should be identical to the originals.
Before replacing any of these components, read carefully the "PRODUCT SAFETY
NOTICE" at Page 2. Do not degrade the safety of the receiver through improper servicing.
Notice: The part number must be used when ordering spare parts In order to facilitate order
processing, be sure to include the model number and description.
*
mark are for 'THOMSON' 29" SUPERFLAT CRT - A68EGD049X70 WORLD WIDE.
*
mark are for 'TOSHIBA' 29" PERFECTLY FLAT CRT - A68LQP356X03(Z).
*
mark are for 'FORTUNE' 29" SUPERFLAT CRT - 73SX732Y22-DC01
ELECTRICAL COMPENONTS LIST
23
SYMBOL NO. PART NUMBERPART DESCRIPTIONSYMBOL NO. PART NUMBERPART DESCRIPTION
Monitor Output Terminals Video Output: RCA type - 1Vp-p, 75 Ohm
Audio Output: RCA type – 400Mv
Audio Output: Main Speaker: 4+4W; Woofer: 4.5W (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.
34
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