Panasonic TX-29FX20R Manuale utente
ORDER NO. MTV0601420CE
Colour Television
TX-29FX20R
GP41 Chassis
SPECIFICATIONS
Specifications
1
Power Source : AC SINGLE 220-240V, 50/60 Hz
Power Consumption : 98W
Aerial Impedance : 75 unbalanced
Coaxial type
Receiving System : 17 Systems
Receiving Channels :
VHF 2-12 PAL / SECAM B,K1
0-12 PAL B (AUST)
1-9 PAL B (N.Z)
1-12 PAL/SECAM D
1-12 NTSC M (JAPAN)
2-13 NTSC M (U.S.A)
UHF 21-69 PAL G,H,I / SECAM G,K,K1
28-69 PAL B (AUST)
13-57 PAL D,K
13-62 NTSC M (JAPAN)
13-69 NTSC M (USA)
CATV S1-S20 (OSCAR)
1-125 (U.S.A CATV)
C13-C49 (JAPAN)
S21-S41 (HYPER)
Z1-Z37 (CHINA)
5A, 9A (AUST)
Video / Audio Terminals :
DVD
Y1.0Vp-p, 75
PB 0.7Vp-p, 75
PR 0.7Vp-p, 75
AV 1,2,3
Video In 1Vp-p, 75
Audio In Approx. 0.5V, 47k
Monitor Out
Video Out 1Vp-p, 75
Audio Out Approx. 0.5V, 1k
Intermediate Frequency :
Video 38.0 MHz
Sound 31.5 MHz (D, K, K1)
32 MHz (I)
32.5 MHz (B, G)
33.5 MHz (M)
Colour 33.57 MHz (PAL)
33.6 MHz (SECAM)
33.75 MHz (SECAM)
34.42 MHz (NTSC)
High Voltage : 31.0kV ±1.0
at zero beam current
Picture Tube : A68LZU185X-E
67.6cm (29 inches)
Measured diagonally,
90° deflection
Audio Output : 16.0W
Dimensions : Height : 578 mm
Width : 786 mm
Depth : 508 mm
Mass : 43 kg (Net Wt.)
Specifications are subject to change without notice. / Mass
and dimensions shown are approximate.
2006 Matsushita Electric Industrial Co., Ltd. All rights reserved.
Unauthorized copying and distribution is a violation of law.
1. Safety Precautions
1.1. General Guide Lines
2
1. It is advisable to insert an isolation transformer in the AC supply before
servicing this hot chassis.
2. When servicing, observe the original lead dress, especially the lead
dress in the high voltage circuits. If a short circuit is found, replace all
parts which have been overheated or damaged by the short circuit.
3. After servicing, see to it that all the protective devices such as
insulation barriers, insulation papers, shields and isolation R-C
combinations, are properly installed.
4. When the receiver is not to be used for a long period of time, unplug
the power cord from the AC cord outlet.
5. Potential, as high as 32.0kV is 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 thoroughly familiar with
the precautions necessary when working on high voltage equipment.
Always discharge the anode of the picture tube to the receiver chassis
before handling the tube. After servicing make the following leakage
current checks to prevent the customer from being exposed to shock
hazards.
1.2. Leakage Current Cold Check
1. Unplug the AC cord and connect a jumper between the two prongs on
the plug.
2. Turn on the receiver’s power switch. / Measure the resistance value,
with an ohmmeter, between the jumper AC 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 4 M and 20
M . When the exposed metal does not have a return path to the
chassis, the reading must be infinite.
1.3. Leakage Current Hot Check (Fig. 1)
1. Plug the AC cord directly into the AC outlet. Do not use an isolation
transformer for this check.
2. Check a 2 k non-inductive resistor and an AC/DC current meter, in
series with each exposed metallic part on the receiver in turn and an
earth such as a water pipe.
3
The current from any point should not exceed 0.7 mA peak AC or 2 mA
DC. In the case of a measurement being outside of these 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.
Fig. 1
1.4. X-Radiation
Warning:
The potential sources of X-Radiation in TV set are the EHT section and the picture tube. When using a
picture tube test jig for service, ensure that jig is capable of handling 32.0kV without causing X-
Radiation.
Note: It is important to use an accurate periodically calibrated high voltage meter.
1. Set the brightness to minimum.
2. Use the remocon to get into Service Mode.
3. Measure the EHT. The meter reading should indicate 31.0±1.0kV. If the
meter indication is out of tolerance, immediate service and correction
is required to prevent the possibility of premature component failure.
4. To prevent the possibility X-Radiation, it is essential to use the
specified picture tube, if service replacement becomes necessary.
1.5. GP41 Chassis Block Diagram
2. Service Hints
2.1. Service Position for E-Board
1. Remove the back cover.
2. Stand the TV set as shown in Fig. 2.
3. Remove the A-Board from the TV set by pulling the main board out as
shown in Figure 2.
4
Fig. 2
2.2. Adjustment for White Balance
Preparation:
1. Receive the white balance pattern and aging should have been
performed over 30 minutes.
2. Set the picture menu to DYNAMIC NORMAL.
3. Degausse the CRT face.
4. Fix the CRT colour analyzer receiver unit to CRT face.
Adjustment of Low Light.
1. Adjustment Sub Bright, so that Y = 6.5 ± 1.0 nit.
2. Adjustment R-CUT OFF, so that X = 0.247 ± 0.005 nit.
3. Adjustment G-CUT OFF, so that Y = 0.273 ± 0.005 nit.
Adjustment of High Light
1. Adjustment Sub Bright, so that Y = 150 nit.
2. Adjustment R-Drive, so that X = 0.261 ± 0.003 nit.
3. Adjustment B-Drive, so that Y = 0.267 ± 0.003 nit.
2.3. Adjustment for CRT CUT OFF
Preparation:
1. Connect the oscilloscope probe to (GREEN CATHODE) on L Board.
2. Screen VR min.
3. Set the data Sub Bright, Bright.
4. In service Mode at “Bright” dac press [5] in factory mode to enter
vertical line and adjust by volume down or up button.
5. Adjust “Screen VR” to set voltage as in table 1.
5
2.4. Adjustment Procedure
2.4.1. +B Voltage
Item / preparation
1. Operate the TV set.
2. Set control as follows :
Brightness ........... minimum
Contrast ............... minimum
Adjustment procedure
1. Confirm the DC voltage at the indicated test points, as follows :
TPA 15 : 3.35 ± 0.2V
TPA 16 : 141 ± 2V
TPA 17 : 8.2 ± 0.3V
TPA 18 : 1.9 ± 0.2V
TPA19 : 5.2 ± 0.2V
TPA20 : 220 ± 15V
2.4.2. High Voltage
Item / preparation
1. Receive the crosshatch pattern.
2. Set to 0 Beam.
Screen VR .......... minimum
Contrast .............. minimum
Adjustment procedure
6
1. Connect a DC voltage meter to TPA 16 and confirm the +B voltage is
141.0 ± 2V.
2. Connect a high frequency voltmeter to heater and confirm that voltage
reads 6.3 ± 0.24 (VRMS).
3. Normalize the brightness and contrast.
2.5. Adjustment
Before Colour Purity, Convergence and White Balance
adjustment are attempted,
V. Height, H. Centre and Focus adjustments must be completed.
Colour Purity
1. Set the Brightness and Contrast controls to their maximum positions.
2. Operate the TV set for 60 minutes.
3. Fully degausse the picture tube by using an external degaussing coil.
4. Apply a crosshatch pattern signal and adjust the static convergence
magnets to the approximately correct position.
5. Receive a black and white signal.
6. Set the control as follows: / Red................minimum /
Green.............minimum / Blue...............minimum / Press the Shipping
button on the remote control twice to select CRT Adjustment Mode to
select low light.
7. Loosen the clamp screw for the Deflection Yoke A in Fig. 10 and move
the Deflection Yoke as close to the purity magnet as possible.
8. Adjust the purity magnetic rings so that a vertical green field is
obtained at the centre of the screen.
Fig. 6
9. Slowly push the Deflection Yoke and set it where a uniform green field
7
is obtained.
Fig. 21
10. Re-adjust the Low Light controls to their correct settings and make
sure that a uniform white field is obtained.
11. Tighten the clamp screw A in Fig. 10.
Convergence
1. Apply a crosshatch pattern signal and Normalize Contrast control to
the maximum positions.
2. Adjust Brightness until the grey position of the crosshatch pattern just
becomes black.
3. Adjust the Red and Blue line at the centre of the screen by rotating the
R-B static.
Fig. 8
4. Adjust Red and Blue with Green line at centre of the screen by rotating
(RB)-G static convergence magnetic rings.
5. Lock convergence magnets with silicone sealer.
6. Remove the DY wedges and slightly tilt the Deflection Yoke vertically
8
and horizontally to obtain the good overall convergence.
Fig. 9
7. Fix the Deflection Yoke by reinserting the DY wedges. Refer to Fig. 10.
8. If purity error is found, repeat “Colour Purity” adjustment.
Fig. 10
Fig. 11
9
Notes:
1. Wedge A, B and C should be inserted following the sequence of 1, 2
and 3 shown in Fig. 11.
2. The wedges should be set 120° apart from each other.
3. Be certain that three wedges are firmly fixed and the Deflection Yoke is
tightly clamped in place. / Otherwise the Deflection Yoke may shift its
position and cause a loss of convergence and purity.
3. Conductor Views
4. Schematic Diagram
10
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