SPECIFICATIONS
Power Source: |
220-240V a.c., 50Hz |
Power Consumption: |
39W |
Stand-by Power |
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Consumption: |
2.9W |
Aerial Impedance: |
75Ω unbalanced, Coaxial Type |
Receiving System: |
PAL I, PAL-525/60 |
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M.NTSC |
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NTSC (AV only) |
Receiving Channels: |
UHF E21-E68 |
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CH01-CH99 (L (IRISH) MODELS) |
Intermediate Frequency: |
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Video/Audio |
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Video |
39.5MHz |
Audio |
33.5MHz |
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32.95MHz (NICAM) |
Colour |
35.07MHz (PAL) |
Terminals: |
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AV1 IN |
Video (21 pin) 1V p-p 75Ω |
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Audio (21 pin) 500mV rms 10kΩ |
RGB (21 pin)
Audio (RCA x 1) 500mV rms 10kΩ
Video (RCA x 1) 1V p-p 75Ω
ORDER No. SM-02008
Colour Television
TX-14B4T TX-14B4T/B TX-14B4TL TC-14B4R TC-14B4R/B
Z-185 Chassis
AV1 OUT |
Video (21 pin) |
1V p-p 75Ω |
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Audio (21 pin) |
500mV rms 1kΩ |
Picture Tube: |
A34EAC01X06 34cm |
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High Voltage: |
26.5 ± 1kV |
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Audio Output: |
2.5W |
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(Music Power) |
8Ω Impedance |
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Headphones: |
8Ω Impedance |
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Accessories |
3.5mm |
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supplied : |
Remote Control |
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2 x R6 (UM3) Batteries |
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Dimensions: |
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Height: |
342mm |
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Width: |
366mm |
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Depth: |
376mm |
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Net weight: |
9.6kg |
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Specifications are subject to change without notice. Weights and dimensions shown are approximate.
CONTENTS |
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SAFETY PRECAUTIONS.......................................................................................................................................................... |
2 |
SERVICE HINTS ....................................................................................................................................................................... |
3 |
ALIGNMENT PROCEDURE AND OPTION SETTINGS............................................................................................................ |
4 |
WAVEFORM PATTERN TABLE ............................................................................................................................................... |
5 |
BLOCK DIAGRAMS .................................................................................................................................................................. |
6 |
PARTS LOCATION ................................................................................................................................................................... |
7 |
REPLACEMENT PARTS LIST .................................................................................................................................................. |
8 |
SCHEMATIC DIAGRAMS ....................................................................................................................................................... |
14 |
CONDUCTOR VIEWS............................................................................................................................................................. |
16 |
SAFETY PRECAUTIONS
GENERAL GUIDE LINES
1.It is advisable to insert an isolation transformer in the a.c. supply before servicing a hot chassis.
2.When servicing, observe the original lead dress in the high voltage circuits. If a short circuit is found, replace all parts that have been overheated or damaged by the short circuit.
3.After servicing, see that all the protective devices such as insulation barriers, insulation papers, shields and isolation R-C combinations are correctly installed.
4.When the receiver is not being used for a long period of time, unplug the power cord from the a.c. outlet.
5.Potentials as high as 27.5kV are present when this receiver is in operation. Operation of the receiver without the rear cover involves the danger of a shock hazard from the receiver power supply. Servicing should not be attempted by anyone who is not familiar with the precautions necessary when working on high voltage equipment. Always discharge the anode of the tube.
6.After servicing make the following leakage current checks to prevent the customer from being exposed to shock hazard.
LEAKAGE CURRENT COLD CHECK
1.Unplug the a.c. cord and connect a jumper between the two prongs of the plug.
2.Turn on the receiver’s power switch.
3.Measure the resistance value with an ohmmeter, between the jumpered a.c. plug and each exposed metallic cabinet part on the receiver, such as screw heads, aerials, connectors, control shafts etc. When the exposed metallic part has a return path to the chassis, the reading should be between 4M ohm and 20M ohm. When the exposed metal does not have a return path to the chassis, the reading must be infinite.
LEAKAGE CURRENT HOT CHECK
1.Plug the a.c. cord directly into the a.c. outlet. Do not use an isolation transformer for this check.
2.Connect a 2kΩ 10W resistor in series with an exposed metallic part on the receiver and an earth, such as a water pipe.
3.Use an a.c. voltmeter with high impedance to measure the potential across the resistor.
4.Check each exposed metallic part and check the voltage at each point.
5.Reverse the a.c. plug at the outlet and repeat each of the above measurements.
6.The potential at any point should not exceed
1.4V rms. In case a measurement is outside the limits specified, there is a possibility of a shock hazard, and the receiver should be repaired and rechecked before it is returned to the customer.
X-RADIATION WARNING
1.The potential sources of X-Radiation in TV sets are the high voltage section and the picture tube.
2.When using a picture tube test jig for service, ensure that the jig is capable of handling 27.5kV without causing X-Radiation.
NOTE: It is important to use an accurate periodically calibrated high voltage meter.
HOT CHECK CIRCUIT
a.c. VOLTMETER
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WATER PIPE |
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2kΩ 10 Watts |
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(EARTH) |
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TO INSTRUMENT’S EXPOSED
METALLIC PARTS
Fig. 1.
1.Set the brightness to minimum.
2.Measure the high voltage. The meter should indicate 26.5kV ± 1kV.
If the meter indication is out of tolerance, immediate service and correction is required to prevent the possibility of premature component failure.
3.To prevent any X-Radiation possibility, it is essential to use the specified tube.
2
SERVICE HINTS
How to remove the rear cover
1. Remove the 10 screws as shown in Fig.2.
SCREWS |
SCREWS |
Fig.2.
LOCATION OF CONTROLS
Y-Board
E-Board |
Focus |
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Screen |
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Fig.3. |
3
ALIGNMENT PROCEDURE AND OPTION SETTING
Entering SERVICE mode
Service mode is entered by selecting the “mute” remote key and local “down” simultaneously with the sharpness DAC set to
Minimum and programme position 99 selected. |
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Service mode 2 is selected by pressing the Recall remote key while in service mode 1. |
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Service mode navigation |
:cycle through the service items available. |
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- Up /Down remote keys |
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- -/+ remote keys |
:Decrement/Increment the values within range. |
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- TV/AV |
:Store the current data. |
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- 0 – 7 digit keys |
:Toggle bits 0-7 in option byte (service mode 2). |
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Order |
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Item |
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Range |
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1 |
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Cut off (VG2) |
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LED ON , LED OFF |
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2 |
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Vertical slope |
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0-63 |
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3 |
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Vertical Shift |
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0-63 |
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4 |
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Vertical amplitude |
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0-63 |
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5 |
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Horizontal shift |
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0-63 |
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6 |
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Red Cut |
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0-63 |
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7 |
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Green Cut |
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0-63 |
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8 |
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Red Drive |
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0-63 |
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9 |
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Green Drive |
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0-63 |
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10 |
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Blue Drive |
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0-63 |
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11 |
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AGC |
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0-63 |
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12 |
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Sub-Colour |
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0-63 |
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13 |
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Sub-Brightness |
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0-63 |
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Sub-Colour: Set sub-colour to 16.
Sub-Brightness: Set sub-colour to 33.
G2 alignment: Before entering into service mode, recall the nominal picture setting :remote key “N”. From this setting, increase brightness by 11 steps and reduce sharpness to minimum.
Tune a colour bar signal on Prg 99 and enter into SVC mode. In SVC mode , select “G2” item and press – or + remote key to control software disable vertical deflection. The user must then adjust G2 voltage on FBT, to find the point where LED is ON. Press – or + remote key to return to normal SVC mode.
White balance: - Select a dark picture and adjust Red Cut and Green Cut to the desired colour temperature.
-Select a bright picture, set Blue Drive to 32 and adjust Red Drive, and Green Drive to the desired colour temperature.
4
CIRCUIT BLOCK DIAGRAM
8 |
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