TX-15PM30T, TC-21X3, TX-21X3T - Panasonic TV Service Manual (repair manual)

Model
TX-15PM30T TC-21X3 TX-21X3T
Pages
28
Size
2.37 MB
Type
PDF
Document
Service Manual
Brand
Device
TV / MX-7
File
tx-15pm30t-tc-21x3-tx-21x3t.pdf
Date

View Panasonic TX-15PM30T / TC-21X3 / TX-21X3T Service Manual online

Service Manual
Colour Television
  
TX-15PM30T
    
MX-7 Chassis
Specifications
Power Source : AC AUTO 110-240V, 50/60Hz
Video / Audio Terminals :
FAV In :  Video In 1 Vp-p 75           
Power Consumption : 69W
Audio In Approx, 400mVrms
RAV In : Video In 1 Vp-p 75           
Aerial Impedance:75    unbalanced
Audio In Approx, 400mVrms
 Coaxial type
Monitor Out :Video Out1 Vp-p 75        
Audio OutApprox, 400mVrms
Receiving System : 17 System
Receiving Channels :
High Voltage : 27.5 kV ( +/- 1.0 )
VHF
2-2 
(PAL/SECAM B,K1)
 at zero beam current
0-12  (PAL B AUST)
1-9
(PAL B N.Z)
Picture Tube : A36LTN194X
1-12  (PAL/SECAM D)
36cm (15 inches)
1-12  (NTSC M JAPAN)
Measured diagony, 90  deflection
2-13 (NTSC M U.S.A)
 
UHF
21-69 (PAL G,H,I/SECAM G,K,K1)
28-69 (PAL B AUST)
Audio Output : 2W x 2 = 4W
13-57 (PAL D,K)
13-62 (NTSC M JAPAN)
       
14-69 (NTSC M U.S.A)
CATV
S1-S41(OSCAR)
Dimensions :  Height  : 373.5 mm
1-125 (U.S.A CATV)
Width  : 485.0 mm
C13-C41(JAPAN)
Depth  : 380.0 mm
S21-S41 (HYPER)
Z1-Z37   (CHINA)
Mass : 12.5 kg
Intermediate Frequency :
Video
38.0 MHz
Specifications are subject to change without 
Sound
31.5 MHz (D,K) / 32.5MHz (B,G)
notice.Mass and dimensions shown are approxi
32.0 MHz (I) / 33.5MHz (M)
mate.
Colour
33.57 MHz (PAL)
33.6 MHz (SECAM)
33.75 MHz (SECAM)
34.42 MHz (NTSC)
Panasonic
             ORDER NO. MTV0008150C3
c
 
 
°
Contents
.Safety Precautions ........................................................................................ 2
.MX-7 Chassis Block Diagram .................................................................... 4
.Service Hints ................................................................................................. 5
.Adjustments ...................................................................................................7
.Conductor Views ........................................................................................... 13
.Schematic Diagrams .................................................................................... 15
.Parts Location ............................................................................................... 18
.Replacement Part List ................................................................................. 19 
 
This service literature is designed for experienced repair technicians only and is not designed for use by the
general public. It does not contain warning cautions to advise non-technical individuals of potential dangers in
attempting to service a product. Product powered by electricity should be serviced or repaired only by 
experienced professional technicians. Any attempt to service or repair the product or products dealt with in this
service literature by anyone else could result in serious injury or death.
WARNING
!
Safety Precautions
General Guide Lines
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 circuits 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 28.5kV. 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.
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 metal-
lic cabinet part on the receiver, such as screw heads, aerials, connectors, control shafts, ect. When the 
exposed metallic part has a return path to the chassis, the reading should be between 4 Mohm and 20 
Mohm.When the exposed metal does not have a return path to the chassis, the reading must be infinite.
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 kohm 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.
The current from any point should not exceed 0.7 mA peak AC or 2mA DC. In the case of a measure-
ment 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
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 28.5kV
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 27.5(+-1.0)kV. 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 specifield picture tube, if
    service replacement becomes necessary.
MX-7 Chassis Block Diagram
Service Hints.
 Service Position for E-Board
1. Remote the back cover.
2. Stand the TV set as shown in fig. 7.
3. Remove the A-Board from the TV set by pulling the main board out as shown in figure 7.
Fig.7
Factory mode adjustment :
How To Set : To set the Factory mode, press Volume 0 dac on the TV and Timer Setting 30min
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 move from CHK1 to CHK2 mode, etc, please follow below rotation :
To Set Self-Check : Press the volume down button on TV than press the off timer button on
   remote control.                   
Pull out this way
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 to DYNAMIC NORMAL.
3. Degause 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 = 6.3 +- 1.0nit.
2. Adjust R-CUT OFF, so that X = 0.235 +- 0.01nit.
3. Adjust G-CUT OFF, so that y = 0.235 +- 0.01nit.
Adjustment of High Light.
1. Adjust Sub Bright, so that Y = 390 nit.
2. Adjust R-Drive, so that X = 0.259 +- 0.01nit.
3. Adjust B-Drive, so that y = 0.259 +- 0.01nit.
Adjustment for CRT CUT OFF.
Preparation :
1. Connect ocilloscope probe to TPL7.
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.
 
130V
0V
Adjustment Procedure
Item / Preparation
Adjustment Procedure
+B Voltage
1. Operate the TV set.
Confirm the DC voltage at the indicated test points,
as follow : 
2. Set control as follow :
TPA 12 : 141.2 +- 0.8V
TPA 21 : 215 +- 15V
    Brightness ..... minimum
TPA 11 : 8 +- 1V
    Contrast ........ minimum
TPA 10 : 5 +- 1V
RF AGC
1. Receive a colour bar signal at an
1. Select “RF AGC” indication in CHK 2, on Screen 
    RF level of 75dBU with 75         
    by remote control at factory mode.
    loaded.
2. Connect digital multimeter to RF AGC
2. Set RF AGC by using remote control volume (+) 
    at Tuner.
    or volume (-) button until voltage AGC at Tuner
    reach 2.7 +- 0.1V.
3. Increase RF signal strenght 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 141.2 +- 0.8V.
2. Set to 0 Beam .
2. Connect a high frequency voltmeter to heater and
    Screen VR ..... minimum
    confirm that voltage reads 6.0+- 0.24 (VRMS).
    Contrast ....... minimum
3. Normalize the brightness and contrast.
   
       
Item / Preparation
Adjustment Produre
Connect a short jumper between TPA 10
1. Adjust Sub-Tint so that No.2,3 and 4 becomes
and TPA 20.
    level waveform is similiar to Fig. 10.
Press Main Menu and Set system to 
2. Confirm phase at Tint is changes more than
Use AV-NTSC (3.58MHz).
    +/- 30 by Tint control.
DYNAMIC ....... Normal
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.
 
0.5a
a
7  8  9  10
1  2  3   4  5    6
Fig. 10
Pal Colour
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. Connect TPA 10 to TPA 20.
5. Set (A) to 2.3 +- 0.2V by BRT (CHK2) Fig. 1.
Adjustment
1. Connect oscilloscope probe to TPA 31 (G OUT) with 10k series resistor and adjust Contrast so
    that (B) as in Fig.1 is 2.8 +- 0.1V.
2. Adjust ‘Sub Colour’ so that waveform as in Fig.1 (1) 2.5 +- 0.1V.
3. Connect oscilloscope probe to TPA 32 (R OUT) with 10k series resistor and confirm waveform as in 
    Fig.2 is (2).2.7 +- 0.4V
Fig. 1
Fig. 2
B
1
 A
2
 A
 0V
Before Colour Purity, Convergence and White Balance adjustment are attempted, 
V. Height, H. Centre and Focus adjustments must be completed. 
Colour Purity
Convergence
1. Set the Brightness and Contrast controls to
  1. Apply a crosshatch pattern signal and
their maximum postions.
 Normalize Contrast control to the
2.  Operate the TV set for 30 minutes.
      maximum positions.
3.  Fully degauss the picture tube by using an
  2. Adjust Brightness until the grey position of
 external degaussing coil.
      the crosshacth pattern just becomes black.
4.  Apply a crosshatch pattern signal and adjust
  3. Adjust the Red and Blue line at the centre of
 the static convergence magnets to the 
      the screen by rotating the R-B static 
 approximately correct position.
5.  Receive a black and White signal.
6.  Set the control as following:
Red ................ minimum
Green ............. minimum
Blue ............... minimum
Press the Shipping button on the remote control
twice to select CRT Adjustment Mode as per
Fig. 16 to select low light.
7. Loosen the clamp screw for the deflection yoke
A in Fig. 24 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 cntre of the screen.
                                  Fig.22
 4. Adjust Red and Blue with Green line at 
        
     centre of the screen by rotating (RB) -G
     static convergence magnetic rings.
 
5. Lock convergence magnetic with silicne 
    sealer.
 6. Remove the DY wedges and slightly tilt the
     
     deflection yoke vertically and horizontally to
     obtain the good overall convergence.
 Fig.20
9.  Slowly push the deflection yoke and set it where
 a uniform green field is obtained.
10. Re-adjust the Low Light controls to their correct set-
 tings and make sure that a uniform white field is 
 obtained.
 7. Fix the deflection yoke by re-inserting the DY
11. Tighten the clamp screw A in Fig. 24.    
      wedges.Refer to Fig. 24.
 8. If purity error is found, repeat “Colour
     Purity” adjustment.
Slide magnetic tabs toward or away from
each other.
R-B Static
Convergence Magnet
Vertical
Convergence
Red & Blue
Horizontal
Convergence
Red & Blue
  Rotate both magnetic rings together.
                             
R-B Static
Convergence Magnet
 
 Vertical
Horizontal
 
 
 
RGB
R
G
B
R
G
B
 
   BGR
   
 
BGR
Purity Magnet            Green Field
Colour Purity
 
   Green
 
Uniform
green
Fig. 21
Fig. 23

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