TX-14B4T, TX-14B4B, TX-14B4TL, TC-14B4R, TC-14B4B — Panasonic TV Service Manual (repair manual)

Model
TX-14B4T TX-14B4B TX-14B4TL TC-14B4R TC-14B4B
Pages
14
Size
1.68 MB
Type
PDF
Document
Service Manual
Brand
Device
TV / Z-185 CHASSIS
File
tx-14b4t-tx-14b4b-tx-14b4tl-tc-14b4r-tc-14b4b.pdf
Date

View Panasonic TX-14B4T / TX-14B4B / TX-14B4TL / TC-14B4R / TC-14B4B Service Manual online

                                   Colour Television
TX-14B4T
TX-14B4T/B
TX-14B4TL
TC-14B4R
TC-14B4R/B
 Z-185 
Chassis
SPECIFICATIONS
Power Source:
220-240V a.c., 50Hz
Power Consumption:
39W
Stand-by Power
Consumption:
2.9W
Aerial Impedance:
75
 unbalanced, Coaxial Type
Receiving System:
PAL I, PAL-525/60
M.NTSC
NTSC (AV only)
Receiving Channels:
UHF E21-E68
   CH01-CH99 (L (IRISH) MODELS)
Intermediate Frequency:
Video/Audio
Video
39.5MHz
Audio
33.5MHz
32.95MHz (NICAM)
Colour
35.07MHz (PAL)
Terminals:
AV1 IN                         
Video (21 pin) 1V p-p 75
                                      
Audio (21 pin) 500mV rms 10k
                                     
RGB (21 pin)
                                      
Audio (RCA x 1) 500mV rms 10k
                                      
Video (RCA x 1) 1V p-p 75
AV1 OUT                       Video (21 pin)
1V p-p 75
                                      Audio (21 pin)
500mV rms 1k
Picture Tube:
              
A34EAC01X06 34cm
High Voltage:
26.5
 ± 
1kV
Audio Output:
2.5W
(Music Power)
8
 Impedance
Headphones:
 8
 Impedance
3.5mm
Accessories
supplied :
Remote Control
2 x R6 (UM3) Batteries
Dimensions:
Height:
342mm
Width:
366mm
Depth:
376mm
Net weight:
9.6kg
Specifications are subject to change without notice.
Weights and dimensions shown are approximate.
ORDER No. SM-02008
CONTENTS
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 
2k
 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.
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.
HOT CHECK CIRCUIT
a.c. VOLTMETER
WATER PIPE
(EARTH)
TO INSTRUMENT’S EXPOSED
METALLIC PARTS
Fig. 1.
2k
 10 Watts
2
SERVICE HINTS
How to remove the rear cover
1. Remove the 10 screws as shown in Fig.2.
LOCATION OF CONTROLS
3
Fig.2.
SCREWS
SCREWS
Fig.3.
Screen
Y-Board
Focus
E-Board
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.
Service mode 2 is selected by pressing the Recall remote key while in service mode 1.
Service mode navigation
- Up /Down remote keys                                        :cycle through the service items available.
- -/+ remote keys                                                   :Decrement/Increment the values within range.
- TV/AV                                                                  :Store the current data.
- 0 – 7 digit keys                                                    :Toggle bits 0-7 in option byte (service mode 2).
Order
Item
Range
1
Cut off (VG2)
LED ON , LED OFF
2
Vertical slope
0-63
3
Vertical Shift
0-63
4
Vertical amplitude
0-63
5
Horizontal shift
0-63
6
Red Cut
0-63
7
Green Cut
0-63
8
Red Drive
0-63
9
Green Drive
0-63
10
Blue Drive
0-63
11
AGC
0-63
12
Sub-Colour
0-63
13
Sub-Brightness
0-63
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
Page of 14
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