Panasonic TX-W32R4DP / NN-A720MB / NN-A750WB / NN-A750CB / NN-A850WB / NN-A850CB / NN-A880WB Service Manual ▷ View online
HOW TO MOVE THE CHASSIS INTO SERVICE POSITION
1.
Remove the bead clamper from the mains lead and affix,using back cover screw, into top right-hand cabinet rib (A),
shown in
shown in
Fig.4.
2.
Hold and lift the rear of the E-PCB chassis and gently pull the chassis toward you, as shown in
Fig.4.
3.
Release the respective wiring clips and rotate the chassis vertically through 90
°
, anti-clockwise.
4.
Locate the base of the chassis frame into the hole (B), shown in
Fig.6.
5.
Clip the chassis frame onto the bead clamper, shown in
Fig.5.
6.
After servicing replace the bead clamper and ensure all wiring is returned to its original position before returning the
receiver to the customer.
receiver to the customer.
Fig.4.
Fig.5.
Fig.6.
(B)
4
(A)
ADJUSTMENT PROCEDURE
Item / Preparation
Adjustments
+B SET-UP
1. Receive
a
Greyscale
signal.
2. Set the controls :-
Brightness
Minimum
Contrast
Minimum
Volume
Minimum
1.
Set the +B voltage up as follows:-
Adjust R811 so that B2 shows 148V±1V.
Adjust R811 so that B2 shows 148V±1V.
2.
Confirm the following voltages.
B9
B9
5
± 0,25V
B10
5
±
0,25V
B5
12 ±
0,5V
B11
33 ±
1,5V
B4
16 ± 1V
B7
8
±
0,5V
B12
26 ± 1V
B8
5,5 ±
0,5V
B3
41 ± 1,5V
B13
15 ±
1V
B1
200 ± 10V
B14
-15 ±
1V
CUT OFF / Ug2 Test
1.
Receive a Greyscale signal.
2.
Degauss the tube externally.
3.
Set the TV into Service Mode 1.
4.
Select Cut off mode.
To adjust Cutoff connect an oscilloscope to the Blue
cathode, adjust "cutoff" value using the "Yellow" and "Blue"
buttons until the black level is 160V±5V press "STR" to store
the value. Remove the oscilloscope.
Select Ug2 adjustment and adjust the screen VR until the
display shows "O.K."
cathode, adjust "cutoff" value using the "Yellow" and "Blue"
buttons until the black level is 160V±5V press "STR" to store
the value. Remove the oscilloscope.
Select Ug2 adjustment and adjust the screen VR until the
display shows "O.K."
FACTORY SETTINGS
To return customer settings to factory settings and clear owner ID of all information input by the customer, enter Self-Check
mode. Press the down (-/v) button on the customer controls at the front of the TV set, at the same time pressing the STATUS
button
mode. Press the down (-/v) button on the customer controls at the front of the TV set, at the same time pressing the STATUS
button
on the remote control. To exit Self Check, switch off the TV set at the power button.
Self Check is also used to automatically check the bus lines and hexadecimal code of the TV set.
If the CCU ports have
been checked and found to be incorrect or not located then " - - " will appear in place of "O.K.". For more in-depth TV
diagnostics use the
diagnostics use the
LUCI
interface as listed below.
Service Aids
To aid in the service of our current chassis there are a number of Service Aids which have been made available.
•
LUCI
interface kit (Linked Utility Computer Interface)
Part number: TZS6EZ002
This contains interface and cables for connecting TV service connector and a PC as well as diagnostic software. As new
models are introduced upgrade software will become available.
This contains interface and cables for connecting TV service connector and a PC as well as diagnostic software. As new
models are introduced upgrade software will become available.
•
VICI
(Visual Interactive Computer Information)
These C.D.'s contain multimedia documentation providing quick access to service information.
Part No. TZS7EZ006 & TZS7EZ005
1.
Part No. TZS7EZ006 & TZS7EZ005
1.
Service Manuals
2.
Instruction Books
3.
Technical Information
•
TASMIN
(Technically Advanced System for Multimedia Interactive Notes)
As well as providing a first step towards more interactive training this product also achieves quick access to Technical
Information.
Information.
VDP
O.K.
TUN
O.K.
E2
O.K.
MSP
O.K.
DPL
O.K.
PCB
O.K.
Cab
O.K.
Sum
Factory use only
OPTION 1
00
OPTION 2
21
OPTION 3
02
OPTION 4
09
OPTION 5
B1
OPTION 6
A9
5
NOTE: Self Check should only be used when refurbishing the TV set and not during normal repair work.
WAVEFORM PATTERN TABLE
6
Video Out
IC601 Pin 59
IC601 Pin 59
2V
64
µ
s
B - Out
E8 Pin 4
E8 Pin 4
64
µ
s
4.6V
64
µ
s
2V
H - Pulse
Base Q503
Base Q503
VFLB
IC451 Pin 3
IC451 Pin 3
1V
20ms
B - Out
IC601 Pin 39
IC601 Pin 39
275
mV
64
µ
s
64
µ
s
3V
H - Out
IC601 Pin 50
IC601 Pin 50
Vert Out
IC601 Pin 31
IC601 Pin 31
20ms
0.7V
13
µ
s
3.7V
SCL
IC1201 Pin 3
IC1201 Pin 3
R - Out
E8 Pin 5
E8 Pin 5
64
µ
s
4.6V
HFLB
IC601 Pin 13
IC601 Pin 13
64
µ
s
6.2V
R - Out
IC601 Pin 37
IC601 Pin 37
64
µ
s
275
mV
G - Out
IC601 Pin 38
IC601 Pin 38
275
mV
64
µ
s
Vert Drive
IC451 Pin 2
IC451 Pin 2
20ms
57V
HFLB
IC701 Pin 8
IC701 Pin 8
64
µ
s
1.5V
G - Out
E8 Pin 3
E8 Pin 3
64
µ
s
4.4V
SVM Out
IC601 Pin 34
IC601 Pin 34
88mV
64
µ
s
H - Out
IC701 Pin 5
IC701 Pin 5
30mV
64
µ
s
ALIGNMENT SETTINGS
(The figures below are nominal and used for representative purposes only.)
Alignment Function
Settings / Special features
Horizontal Position
H-Pos
061
Optimum setting.
Vertical Position
V-Pos
005
Optimum setting.
Horizontal Amplitude
H-Amp
055
Optimum setting.
Vert. Amplitude
V-Amp
054
Optimum setting.
EW-amplitude
E/W-Amp1
-128
Optimum setting.
EW-amplitude
E/W-Amp2
006
Optimum setting.
Trapezium-comp
Trapez-1
047
Optimum setting.
Trapezium-comp
Trapez-2
-128
Optimum setting.
Vertical Linearity
V-Lin
006
Optimum setting.
Vertical Symmetry
V-Sym
002
Optimum setting.
DVCO
DVCO
-005
Receive a PAL Colour Bar Pattern. For
DVCO alignment press "Blue" button, wait
until the colours are changing slowly and
press "STR".
DVCO alignment press "Blue" button, wait
until the colours are changing slowly and
press "STR".
Cut-off DC
Cut-off
0171
Ug2 Test
Ug2
055
O.K.
To adjust Cutoff connect an oscilloscope to
the blue cathode, adjust "cutoff" value
using the "Yellow" and "Blue" buttons until
the black level is 160V±5V press "STR" to
store the value. Remove the oscilloscope.
Select Ug2 adjustment and adjust the
screen VR until the display shows "O.K."
the blue cathode, adjust "cutoff" value
using the "Yellow" and "Blue" buttons until
the black level is 160V±5V press "STR" to
store the value. Remove the oscilloscope.
Select Ug2 adjustment and adjust the
screen VR until the display shows "O.K."
Highlight
Lowlight
High
0902
0777
0864
Low
0117
0132
0112
Optimum setting.
Sub-Brightness
Sub-Brightness
255
Optimum setting.
7
Black Level
160V±5V
GND
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