Special components are used in this television set which are important for safety. These parts are identified on the schematic
diagram by the symbol . It is essential that these critical parts are replaced whit the manufacturers specified replacement
parts to prevent X-ray radiation, shock, fire or other hazards. Do not modify the original design whitout manufacturers permission.
An Isolation Transformer should always be used during the servicing of a
receiver whose chassis is not isolated from the AC power line. Use a
transformer of adequate power rating as this protects the technician from
accidents resulting in personal injury from electrical shocks. It will also
protect the Receiver from being damaged by accidental shorting that may
occur during servicing.
When servicing, observe the original lead dress, especially in the high
voltage circuit. Replace all damaged parts (also parts that show signs of
overheating.)
Always Replace Protective Devices, such as fishpaper, isolation resistors
and capacitors, and shields after servicing the Receiver. Use only
manufacturers recommended rating for fuses, circuit breakers, etc.
High potentials are present when this Receiver is operating. Operation of
the Receiver without the rear cover introduces danger from electrical shock.
Servicing should not be performed by anyone who is not thoroughly familiar with the necessary precautions when servicing high-voltage equipment.
Extreme care should be practiced when Handling the Picture Tube. Rough
handling may cause it to implode due to atmospheric pressure (14.7 lbs
per sq. in). Do not sick or scratch the glass or subject it to any undue
pressure. When handling, use safety goggles and heavy gloves for
protection. Discharge the picture tube by shorting the anode to chassis
ground (not to the cabinet or to other mounting hardware). When
discharging, connect cold ground (i.e. dag ground lead) to the anode with
a well insulated wire or use a grounding probe.
Avoid prolonged exposure at close range to unshielded areas of the picture
tube to prevent exposure to X-ray radiation.
The Test Picture Tube used for servicing the chassis at the bench should
incorporate safety glass and magnetic shielding. The safety glass provides
shieldinf for the tube viewing area against X-ray radiation as well as
implosion. The magnetic shield limits X-ray radiation around the bell of the
picture tube in addition to restricting magnetic effects. When using a picture
tube test jig for service, ensure that the jig is capable of handling 31kV
without causing X-ray radiation.
Before returning a serviced receiver to the owner, the service technician
must thoroughly test the unit to ensure that is completely safe to operatore.
Do not use a line isolation transformer when testing.
Mechanical Replacement Parts List ....................................................... 35
Electrical Replacement Parts List .......................................................... 36
Warning !
It is essential that these critical parts are replaced with
the manufacturers specified replacement parts to prevent X-ray radiation, shock, fire or other hazards.
- 2 -
ABOUT LEAD FREE SOLDER (PbF)
This model uses lead free solder (PbF).
CAUTION:
TC-20KL03A / TC-29KL03A
• Pb free solder has a higher melting point than standard solder; typically thmelting point is 50
- 70°F (300 - 400°C) higher . Please use a high temperature soldering iron. In case of the
soldering iron with temperature control,please set it to 700 ± 20°F (370 ± 10°C).
• Pb free solder will tend to splash when heated too high (about 1100°F/ 600°C).
When soldering or unsoldering, please completely remove all of the solder on the pins or
solder area, and be sure to heat the soldering points with the Pb free solder until it melts
enough.
- 3 -
TC-20KL03A / TC-29KL03A
Operating Instructions
CLICK HERE TO SEE THE COMPLETE OPERATING INSTRUCTIONS
- 4 -
TC-20KL03A / TC-29KL03A
Feature Summary
Model: TC-20KL03A / TC-29KL03A
Chassis: MX5ZB
Country: Brasil
System: 3 systems (PAL-M/PAL-N/NTSC) (PAL-M 50hZ)
Power Source: AC Automatic Voltage Selection 110-240 V AC, 60Hz
Memory: 125 positions
TV Tuning Range: 181 channels (TV / CATV)
Language (OSD): Portuguese, Spanish and English
Audio System: Stereo
Vertical Magnetic field: -0.1 ±0.03 (BRASIL)
Color temperature: (High Light) x=0.270 ±0.010, y=0.275 ±0.001, Y=155 (nit)
1- Set the “OFF TIMER” to 30 minutes.
2- Press simultaneously RECALL key on the remote control and VOL(-) button on the unit.
After some seconds, the expression “CHK” should appear on the superior right side of the screen. (To change the
memory data, to press MUTE and e VOLUME(_) simultaneously still with OSD in the way “CHK1”. The key “4” it
moves forward in the memory, and the key “3” it retreats in the memory
Note: To alter in the way CHK1 for the CHK2, CHK3 or CHK4 mode, press the key “2” to move forward and the
key “1” to retreat, as illustrated below.
TO EXIT SERVICE MODE AND RETURN TO THE NORMAL MODE:
Press the “NORMAL” key on the remote control unit or turn off the TV.
CHK1 - OPTIONS
Being in the way CHK1, it will be possible to adjust the options below:
To select the option, type “4” to move forward
and “3” to retreat.
After having selected the wanted option, adjust
it pressing the “VOL(_)” or “VOL(+)” keys.
Press “0” to memorize the adjustment.
- 6 -
TC-20KL03A / TC-29KL03A
CHK2 - VCJ ADJUSTMENTS
In the CHK2 mode is possible to adjust the items of the table.
Note:
T o select the option, type “4” to move forward and “3” to retreat.
After having selected the wanted option, adjust it pressing the “VOL(_)”
or “VOL(+)” keys.
Press “0” T o memorize the adjustment.
CHK3 - PINCUSHION ADJUSTMENTS
In the CHK2 mode is possible to adjust the items of the table.
Note:
T o select the option, type “4” to move forward and “3” to retreat.
After having selected the wanted option, adjust it pressing the “VOL(_)”
or “VOL(+)” keys.
Press “0” T o memorize the adjustment.
In the CHK2 mode is possible to adjust the items of the table.
Note:
T o select the option, type “4” to move forward and “3” to retreat.
After having selected the wanted option, adjust it pressing the “VOL(_)”
or “VOL(+)” keys.
Press “0” T o memorize the adjustment.
To obtain a horizontal line without vertical sweeping, press the “5” key
when the OSD indicates the marked mode. To return to the “CHK4”
mode, press “5” again.
CHK5 - STEREO ADJUSTMENTS
- 7 -
CHK4 TABLE
MEDIUM VALUES
ITEM
R-CUT
G-CUT
S-BRT
SUB CONTRAST
R-DRIVE
G-DRIVE
B-DRIVE
RGB CONTRASTE
T ABELA CHK5
VALORES MÉDIOS
ITEM
INPUT LEVEL
LB SEPARATION
HB SEPARATION
TC-20KL03A
29
26
26
21
26
31
33
7
TC-20KL03A
40
10
27
TC-29KL03A
33
25
25
21
27
31
35
11
TC-29KL03A
41
9
28
TC-20KL03A / TC-29KL03A
ADJUSTMENTS
TEST AND MEASUREMENT EQUIPMENTS
To do all these electrical adjustments, the following equipment is required:
• Dual-Trace Oscilloscope
Voltage Range: 0.001 V to 50 V/Div.
Frequency Range: DC to 50 MHz
Probes: 10:1, 1:1
• NTSC Video Pattern Generator
• DVM (Digital Volt Meter)
• MTS/SAP Signal Generator
• (TV Multi-Channel Sound Modulator (U.S.A.))
• Plastic Tip Driver and Non-Metal Driver
• Isolation Transformer (Variable)
• Degaussing Coil
• White Pattern Generator
• Audio Generator
- 8 -
ADJUSTMENTS
ITEM / PREPARATIONPROCEDURE
TC-20KL03A / TC-29KL03A
1- RF AGC ADJUSTMENT
1. Supply a color bar pattern and adjust the RF input signal
of to 69 dB.
2. Connect the digital multimeter in TPA15.
2- VIF DETECTOR OUTPUT LEVEL
CONFIRMATION
3- BUZZING CONFIRMATION
(AUDIO CIRCUIT)
1. Connect the oscilloscope with a 7kHz filter between
TPA41 and ground or between the speakers terminals
2. Adjust the sound to the maximum..
3. BALANCE: CENTER
SURROUND: OFF
AVL: OFF
SOUND MENU : DIALOGUE
ADJUSTMENT:
1. Select RF AGC in the CHK2 service mode.
2. Adjusts "RF AGC" pressing VOL(+) or (-) until obtaining
2.2±0.1V in TPA20.
3. Increase the input level by +2 dB and confirm that the
voltage decrease.
CONFIRMATION:
1. Install the chassis in the VIF calibration JIG and tune in a
63 dBU colorbar sign (75W open).
2. To connect the oscilloscope in TPA33.
3. To confirm that the output video sign is 1.05 ± 0.15 Vp-p
in TPA 33.
CONFIRMATION:
1. Supply a colorbar signal channel 2, with local frequency
adjusted and the AFC turned on (Channel with sound
bearer and without modulation).
2. Assure that the width in the buzzing waveform is smaller
than 500 m Vp-p.
4- ANODE AND HEA TER VOL T AGE CONFIRMA TION
1. Supply a crosshatch signal.
2. Adjust the bunch current in zero. (0 beam).
3. Adjust “SCREEN VR” and “CONTRAST” to minimum.
CONFIRMATION
1. Connect a voltage meter between TPA12 and ground.
Confirm that the voltage +B is within a range of 140.5V±
1.5V
2. Connect a high frequency voltage meter (VRMS.) among
the heater, and confirm that the voltage is as below:
3. Connect the high voltage meter in the CRT anode pin,
and confirm that the high voltage is within a range of [A].
CRT[A] KV
29”30,5 ~ 27,6
20”27,2 ~ 25,0
- 9 -
TC-20KL03A / TC-29KL03A
ADJUSTMENTS
ITEM / PREPARATIONPROCEDURE
5- PAL COLOR OUTPUT SIGNAL ADJUSTMENT
1. Supply a color bar signal and adjust the local frequency.
2. Adjust “IMAGE” to DYNAMIC NORMAL, “CONTRAST” to
63 and “SUB-CONTRAST” to 21.
3. Adjust the “COLOR FOR CHANNEL” level to NORMAL.
4. Set the CHK2 service mode option, press “5” on the remote
control unit and confirm that OSD becomes blue (AKB
turned off).
5. Connect a short circuit jumper between TPA10 and TP A20.
6. Adjust [A] for 2.3 ± 0.2V through the BRIGHT control
variation in the test point TPL2.
7. Confirm:
CRT20”29”
RGB Contrast7 DAC9 DAC
{354}1719
8. Fix G-DRIVE GAIN, R-DRIVE GAIN and B-DRIVE GAIN
data in 1FH or 31 DAC.
R-DRIVE GAIN: [SLV(8A), SUB (16)]
G-DRIVE GAIN: [SLV(8A), SUB (17)]
B-DRIVE GAIN: [SLV(8A), SUB (18)]
6- NTSC SUB-TINT CALIBRATION
CALIBRATION:
1. Connect the oscilloscope in TPL2 (G-OUT) with a 10KΩ
resistor and adjust CONTRAST, so that the [B] waveform
it is 2.6±0.1V according to fig. 1.
2. Adjust SUB-COLOR to obtain 2,45±0.1V in [D]
according to fig. 1.
3. Connect the oscilloscope in TPL1 (R-OUT) with a 10KΩ
resistor and confirm that the [C] waveform it is 2.45±0.1V
according to fig. 2.
4. Remove the jumper between TPA10 and TPA20, press
the key 5 (AKB ON) and confirm that OSD becomes
white.
Fig. 1
A = 2.3 ±0.2Vo-p
B = 2.4±0.1V
D = 2.45±0.1V
Fig. 2
A = 2.3 ±0.2Vo-p
C = 2.45±0.1V
NTSC 3.58 COLOR SYSTEM CALIBRATION
1. Connect the oscilloscope in TPL2 (R-OUT) with a 10KW
resistor.
2. Supply a Rainbow signal (NTSC 3.58 MHz) through
VIDEO IN.
3. Adjust IMAGE to DYNAMIC NORMAL.
4. Adjust COLOR FOR CHANNEL to NORMAL.
5. Set the CHK2 service mode option, press 5 on the
remote control unit and confirm that OSD becomes blue
(AKB turned off).
6. Connect a short circuit jumper between TPA10 and
TPA20.
7- MTS CALIBRATION
1. Connect the RMS voltage meter through the JIG filter in
TPA44.
2. Connect the RF generator in the tuner terminal.
3. Adjust AVL to ON.
1. Adjust [C] for 5.0±0.2V through the BRIGHT control
variation (CHK2) according to fig. 1.
2. Adjust the NTSC SUB-TINT level according to fig. 1
positions 2, 3 and 4.
3. Remove the jumper.
4. Press 5 and confirm that OSD becomes white (AKB
turned on).
Fig. 1Fig. 2
ADJUSTMENT:
1. Supply the signal through RF antenna input.
VIDEO: 100 IRE FLAT FIELD , 30% of modulation.
AUDIO: 300 Hz , 100% of modulation, monoaural (70 ±
5dB, open, 75W, P/S 10dB) 75 µs with pre-enfasis OFF.
2. Adjust INPUT LEVEL (CHK5) to obtain 106 ± 6 mVrms
in the RMS voltage meter.
- 10 -
ADJUSTMENTS
ITEM / PREPARATIONPROCEDURE
TC-20KL03A / TC-29KL03A
8- MTS CALIBRATION
STEREO SEPARATING ADJUSTMENT
1. Connect the oscilloscope in TPA42.
2. Connect the RF generator in the tuner terminal.
3. Adjust AVL to ON.
9- PROTECTION CIRCUIT (SHUTDOWN)
OPERATION
1. Supply a CROSS-HATCH signal.
2. Adjust CONTRAST and BRIGHT controls to minimum.
2. Adjust V-AMP-60Hz (CHK3) so that, in the Fig.2, be:
CRT->
C,D
A,B
3. MEMORIZE in EEPROM.
20
1.9 ~ 2.2
1.5 ~ 2.3
29
1.5 ~ 2.0
1.5 ~ 1.6
CALIBRATION:
1. Press 5 (AKB OFF) and confirm that OSD becomes blue.
2. Connect the oscilloscope in TPL7 and adjust BRT to obtain
130V as in the Fig. 1 below.
3. Adjust the SCREEN to obtain in the color analyzer
Y = 1.0 +1.0
-0.5
4. Press 5 (AKB OFF) and confirm that OSD becomes blue.
white.
Fig. 1
- 12 -
EEPROM MEMORY MAPS
Observation:
*/XX : Data subjects to alterations in the calibration process (values no fixed).
@: Data of channels
[A-M] : Corresponds to the specification of specific production of each model.
: Fixed data (it doesn't alter in the calibration process)
SUB-ADDRESS
00:Any larger value than 63H will select the channel 0.
01:Bit 1, Bit 2, Bit 3, Bit 5, Bit 6 should be fixed to 0
2:Bit 4, Bit 5, Bit 6 should be 0 and Bit 7 should be 1.
N = AA = ON / 55 OFF (ADJUST: PRESET)
O = AA = ON/ 55 OFF (CLOSED CAPTION)
P = 0 – ENGLISH / CHINESE
1 – SPANISH / PORTUGUESE / ENGLISH
2 – ENGLISH / TAGLISH
3 – ENGLISH
TC-20KL03A / TC-29KL03A
[G] - STEREO
00 – NICAM STEREO (TDA9875)
01 – AV STEREO (TDA9859)
02 – US STEREO
03 – AV STEREO (TDA9870)