Panasonic TC-14Z88RQ User manual

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Table Of Contents
COVER
1 Safety Precautions
1.1 General Guide Lines
1.2 Leakage Current Cold
Check
1.3 Leakage Current Hot
Check (Fig. 1)
1.4 X-Radiation
1.5 GP3 Chassis Block
Diagram
2 Service Hints
2.1 Service Position for E-
Board
2.2 Factory Mode Adjustment
2.3 Adjustment for White
Balance
2.4 Adjustment for CRT CUT
OFF
2.5 Adjustment Procedure
2.6 PAL Colour
2.7 Adjustment
3 Conductor Views
4 Schematic Diagram
4.1 A BOARD
4.1.1 A BOARD (1 / 5)
4.1.2 A BOARD (2 / 5)
4.1.3 A BOARD (3 / 5)
4.1.4 A BOARD (4 / 5)
4.1.5 A BOARD (5 / 5)
4.2 L BOARD
4.2.1 L BOARD (1 / 2)
4.2.2 L BOARD (2 / 2)
5 Part Location
6 Replacement Parts List
6.1 Replacement Parts List
Service Manual
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ORDER NO. MTV0308269C3
Colour Television
●TC-14Z88RQ
GP3 Chassis
Specifications
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Power Source : AC AUTO 110-240V, 50/60 Hz
Power
Consumption : 61W
Aerial Impedance : 75Ωunbalanced
Coaxial type
Receiving System : 17 Systems
Receiving
Channels :
VHF 1-11 PAL B (Australia& N.Zealand)
1-12 PAL/SECAM D
1-12 NTSC M JAPAN
2-12 PAL/SECAM B, G
2-13 NTSC M U.S.A.
UHF 21-69 PAL G I/SECAM B, G, K1
28-69 PAL G (Australia)
13-56 PAL D
13-52 NTSC M JAPAN
14-69 NTSC NTSC M U.S.A.
CATV S1-S41 (Hyper)
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)
Video/ Audio Terminals :
RAV In Video In 1 Vp-p 75Ω
Audio In Approx. 400mVrms
Monitor Out Video Out 1 Vp-p 75Ω
Audio Out Approx. 400mVrms
High Voltage : 24.5kV± -1.5
at zero beam current
Picture Tube : A34KQW42X
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34cm (14 inches)
Measured diagonally,
90° deflection
Audio Output : 5.0W
Dimensions : Height : 356.0 mm
Width : 459.0 mm
Depth : 379.5 mm
Mass : 10.1 kg (Net Wt.)
Specifications are subject to change without notice.
Mass and dimensions shown are approximate.
© 2003 Matsushita Electric Industrial Co., Ltd. All rights reserved. Unauthorized copying and distribution is a violation of law.
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Service Manual
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ORDER NO. MTV0308269C3
Colour Television
●TC-14Z88RQ
GP3 Chassis
Specifications
Power Source : AC AUTO 110-240V, 50/60 Hz
Power
Consumption : 61W
Aerial Impedance : 75Ωunbalanced
Coaxial type
Receiving System : 17 Systems
Receiving
Channels :
VHF 1-11 PAL B (Australia& N.Zealand)
1-12 PAL/SECAM D
1-12 NTSC M JAPAN
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2-12 PAL/SECAM B, G
2-13 NTSC M U.S.A.
UHF 21-69 PAL G I/SECAM B, G, K1
28-69 PAL G (Australia)
13-56 PAL D
13-52 NTSC M JAPAN
14-69 NTSC NTSC M U.S.A.
CATV S1-S41 (Hyper)
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)
Video/ Audio Terminals :
RAV In Video In 1 Vp-p 75Ω
Audio In Approx. 400mVrms
Monitor Out Video Out 1 Vp-p 75Ω
Audio Out Approx. 400mVrms
High Voltage : 24.5kV± -1.5
at zero beam current
Picture Tube : A34KQW42X
34cm (14 inches)
Measured diagonally,
90° deflection
Audio Output : 5.0W
Dimensions : Height : 356.0 mm
Width : 459.0 mm
Depth : 379.5 mm
Mass : 10.1 kg (Net Wt.)
Specifications are subject to change without notice.
Mass and dimensions shown are approximate.
© 2003 Matsushita Electric Industrial Co., Ltd. All rights reserved. Unauthorized copying and distribution is a violation of law.
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1.1 General Guide Lines
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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 26.0kV 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 byanyone 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 leakagecurrent checks to prevent the customer from being exposed to shock hazards.
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1.2 Leakage Current Cold Check
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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
MΩand 20 MΩ. When the exposed metal does not have a return path to the chassis, the reading
must be infinite.
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1.3 Leakage Current Hot Check (Fig. 1)
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1. Plug the AC cord directly into the AC outlet. Do not use an isolation transformer for this check.
2. Check a 2 kΩnon-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.
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 returnedto the customer.
Fig. 1
,
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1.4 X-Radiation
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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 26.0kV 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 24.5±-1.5kV . 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.
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1.5 GP3 Chassis Block Diagram
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2.1 Service Position for E-Board
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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.
Fig. 2
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2.2 Factory Mode Adjustment
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●How to set :
To set the Factory mode, press Volume 0 dac on the TV and Timer Setting 30 min. on the remote
control and press Volume (-) Down button on the TV together press recall on the remote control.
CHK should appear on right of TV screen.
To movefrom CHK1 to CHK2 mode, etc. please follow below rotation :
●
●To Set Self-Check :
Press the Volume Down button on TV then press the Off Timer button on remote control.
●
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2.3 Adjustment for White Balance
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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. Degauss 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 = 7.0 ± 1.0 nit.
2. Adjustment R-CUT OFF, so that X = 0.238 ± 0.010 nit.
3. Adjustment G-CUT OFF, so that Y = 0.229 ± 0.010 nit.
Adjustment of High Light
1. Adjustment Sub Bright, so that Y = 155 nit.
2. Adjustment R-Drive, so that X = 0.263 ± 0.010 nit.
3. Adjustment B-Drive, so that Y = 0.273 ± 0.010 nit.
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2.4 Adjustment for CRT CUT OFF
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Preparation:
1. Connect the oscilloscope probe to TPL5.
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” until 1-H Line appears.
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2.5 Adjustment Procedure
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Item / Preparation Adjustment Procedure
+B Voltage Confirm the DC voltage at the indicated test points, as follows :
1. Operate the TV set. TPA 10 : 141.0 ± 2.0V
2. Set control as follows : TPA 8 : 8 ± 1V
Brightness ........... minimum TPA 9 : 5 ± 1V
Contrast .............. minimum TPA 21 : 175 ± 15
RF AGC
1. Receive a colour bar signal at an RF
level of 69 +1-2 dBU with 75Ω
loaded.
1. Select “RF AGC” indication in CHK2, on Screen by remote control at
factory mode.
2. Connect digital multimeter to RF
AGC at Tuner. 2. Set RF AGC by using remote control Volume (+) or Volume (-) button until voltage AGC at Tuner reaches 2.6 ± 0.1V at TPA 15 (Tuner point).
3. Increase RF signal strength by 2dB, confirm AGC at Tuner voltage drop.
High Voltage
1. Receive the crosshatch pattern. 1. Connect a DC voltage meter to TPA 12 and confirm the +B voltage is 141.0
± 2.0V.
2. Set to 0 Beam.
Screen VR .......... minimum 2. Connect a high frequency voltmeter to heater and confirm that voltage reads
6.0 ± 0.24 (VRMS).
Contrast .............. minimum
3. Normalize the brightness and contrast.
Item / Preparation Adjustment Procedure
NTSC TINT COLOUR
Connect a short jumper between TPA 10
and TPA 20.
Press Main Menu and set system to use
AV-NTSC (3.58 MHz).
DYNAMIC ................. Normal
ChannelCLR Set ..... STD
1. Adjust Sub-Tint so that No. 2, 3 and 4 becomes level waveform is similar to
Fig. 3.
2. Confirm phase at Tint is changes more than ± 30 by Tint control.
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3. Confirm that colour level is maximum when colour DAC is adjusted to
maximum position.
Note: Use remote control only when adjusting user mode to Sub-Tint.
Fig. 3
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2.6 PAL Colour
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1. Receive the PAL B/G studio colour bar pattern and adjust local frequency at the best tuned
position.
2. Pic Menu: Dynamic Normal, Confirm Contrast - 63, Sub Contrast - 21.
3. Channel colour set --------- STD
4. “CHK2” and press digit key “5” (AKB OFF) also confirm OSD become blue colour.
5. Connect TPA 10 to TPA 20.
6. Set (A) to 1.9 ± 0.1V by BRT (CHK2) at measurement point TPL 2 Fig. 4.
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2.7 Adjustment
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1. Connect oscilloscope probe to TPL 2 (G OUT) with 10kΩseries resistor and adjust Contrast so
that (B) as in Fig. 4 is 2.60 ± 0.05V.
2. Adjust “Sub Colour” so that waveform as in Fig. 4 (1) 2.3 ± 0.2V.
3. Connect oscilloscope probe to TPL 1 (R OUT) with 10kΩseries resistor and confirm waveform
as in Fig. 5 is (2) 2.3 ± 0.2V.
4. Take out jumper TPA 10 and TPA 20.
5. Press digit key “5” (AKB ON) and confirm the OSD become white colour.
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 degauss the picture tube by using an external degaussing coil.
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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 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.
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