Panasonic TX-21AT1P User manual

ORDER No. 03-SM-004
Service Manual
Colour Television
TX-21AT1P
Z8T Chassis
SPECIFICATIONS
Power Source: 220-240V a.c., 50Hz
Power Consumption: 48W
Stand-by Power
Consumption: 0,8W
Aerial Impedance: 75Ωunbalanced, Coaxial Type
Receiving System: PAL B/G, PAL D/K ,PAL-60
SECAM B/G, SECAM D/K
M.NTSC (AV)
NTSC(AVonly)
Receiving Channels:
VHF E2-E12 VHF H1-H2 (ITALY)
VHF A-H (ITALY) VHF R1-R2
VHF R3-R5 VHF R6-R12
UHF E21-E69 CATV (S01-S05)
CATV S1-S10 (M1-M10) CATV S11-S20 (U1-U10)
CATV S21-S41 (HYPERBAND)
Intermediate Frequency:
Video/Audio
Video 38,9MHz
Audio 32,4MHz, 33,4MHz
Colour 34,47MHz (PAL),
34,5MHz (SECAM),
34,65MHz (SECAM)
Terminals:
AV1 IN Video (21 pin) 1V p-p 75Ω
Audio (21 pin) 500mV rms 10kΩ
RGB (21 pin) 0,7V p-p 75Ω
AV1 OUT Video (21 pin) 1V p-p 75Ω
Audio (21 pin) 500mV rms 1kΩ
AV FRONT Audio (RCAx1) 500mV rms 10kΩ
Video (RCAx1) 1V p-p 75Ω
High Voltage: 27kV ± 1kV
Picture Tube: A51ERF135X71 51cm
Audio Output: 1 x 5W RMS, 1 x 10W MPO
8ΩImpedance
Headphones: 8ΩImpedance
Accessories
supplied : Remote Control
2 x R6 (UM3) Batteries
Dimensions:
Height: 476mm
Width: 524mm
Depth: 473mm
Net weight: 22kg
Specifications are subject to change without notice.
Weights and dimensions shown are approximate.
NOTE: This Service Manual should be used in conjunction with
the Z8 Technical guide.

CONTENTS
SAFETY PRECAUTIONS ......................................................................................................................................................... 2
SERVICE HINTS ...................................................................................................................................................................... 3
ADJUSTMENT PROCEDURE AND SELF-CHECK .................................................................................................................. 4
WAVEFORM PATTERN TABLE............................................................................................................................................... 5
ALIGNMENT SETTINGS .......................................................................................................................................................... 6
BLOCK DIAGRAMS.................................................................................................................................................................. 7
PARTS LOCATION................................................................................................................................................................. 10
REPLACEMENT PARTS LIST................................................................................................................................................ 11
SCHEMATIC DIAGRAMS....................................................................................................................................................... 17
CONDUCTOR VIEWS ............................................................................................................................................................ 20
SAFETY PRECAUTION
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 28kV 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 a 2kΩ10W 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 previous measurements.
6. The potential at any point should not exceed
1,4 Vrms. 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.
HOT CHECK CIRCUIT
a.c. VOLTMETER
WATER PIPE
(EARTH)
TO INSTRUMENT'S EXPOSED
METALLIC PARTS Fig. 1.
2k
Ω
10 Watts
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 28kV 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:
27kV ± 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.
2

SERVICE HINTS
How to remove the rear cover
1. Remove the 5 screws as shown in Fig.2.
LOCATION OF CONTROLS
Screws
Screws
Fig.2.
3
Fig. 3
Y
-Board
E-Board Focus Screen

ADJUSTMENT PROCEDURE
Item / Preparation Adjustments
+B SET-UP
1. Receive a Greyscale signal.
2. Set the controls :
Brightness Minimum
Contrast Minimum
Volume Minimum
Confirm the following voltages.
B1 3,3 ± 0,3V B13 -16 ± 1V
B2 190 ± 10V B14 27,5 ± 1,5V
B3 16 ± 1V B15 28 ± 1,5V
B4 10 ± 1V B16 13 ± 1V
B8 5 ± 0,3V B17 8 ± 1V
B11 127 ± 10V B18 5 ± 0,3V
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.
Set Contrast on maximum, set Brightness on center, switch
on AV mode.
Enter Service mode. Set Sub-Brightness to 31. Select Ug2
Test. Press "+" and adjust screen Vr till sharp vertical line is
visible and LED switches off. Then reduce screen Vr till LED
is just switched on.
SELF CHECK
Self-check is used to automatically check the bus lines and hexadecimal code of the TV set.To enter Self-Check mode, press
the STATUS button on the remote control and at the same time press the down (-/v) button on the customer controls at
the front of the TV set. To exit Self Check, switch off the TV set at the power button.
OPTION 1 E0
OPTION 2 02
If the CCU
p
o
r
ts have been checked and found to be incorrect or not located then " - - " will a
pp
ear in
p
lace of "O.K.".
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.
• VICI (Visual Interactive Computer Information)
These C.D.'s contain multimedia documentation providing quick access to service information.
Part No. TZS7EZ006, TZS7EZ005, TZS8EZ001 & TZS9EZ001
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.
4

WAVEFORM PATTERN TABLE
CONDITIONS:
Contrast: MAX
Brightness: MID
Colour: MID
Sharpness: MID
5

ALIGNMENT SETTINGS
To access Service Mode select program position 99 and set sharpness to minimum.
Press “MUTE” button on remote control and at the same time press the "V" button on the customer controls at the front of
the TV, this will place the TV set into Service Mode.
Press ∧/ ∨ buttons to step up / down through the functions.
Press + / - buttons to alter the function values.
Press “STR” button on the customer controls at the front of the TV after each adjustment has been made to store the
required values.
To exit Service Mode press “N” button.
Alignment Function Setting indication
Note: All setting values are approximate Settings / Special features
1. Cut off (Ug2) LED ON/OFF LED to be just ON
2. Vertical slope V-SLO 029 Optimum setting.
3. Vertical Position V-POS 035 Optimum setting.
4. Vert. Amplitude V-AMP 054 Optimum setting.
5. Horizontal Shift H-CTR 034 Optimum setting.
6. Horizontal Parallelogram H-PAR 035 Optimum setting.
7. Horizontal Bow H-BOW 025 Optimum setting.
8. R-Cut R-CUT 008 Optimum setting.
9. G-Cut G-CUT 008 Optimum setting.
10. R-Drive R-DRV 039 Optimum setting.
11. G-Drive G-DRV 031 Optimum setting.
12. B-Drive B-DRV 031 Optimum setting.
13. AGC AGC 028 Optimum setting.
14. Sub Colour S-COL 015 Optimum setting.
15. Sub Brightness S-BRI 026 Optimum setting.
16. Horizontal Width EW-WD 049 Optimum setting.
17. EW Parabola EW-PR 009 Optimum setting.
18. EW Upper Corners EW-UC 037 Optimum setting.
19. EW Lower Corners EW-LC 051 Optimum setting.
20. EW Trapezoid EW-TP 022 Optimum setting.
To access Option Bytes input remote code "FA" followed by key 5(14 hex) or to access from Service Mode press "Status
button" on remote control.
(numerical keys 0-7 to change value, TV/AV button to store on remote control):
Option Byte 1 Option Byte Table Option Byte 2 Option Byte Table
Bit No. Value Functions Bit No. Value Functions
0 0 French model
0
1
NO
YES 0 0 Sound AI 0
1
NO
YES
1 0 Irish model
0
1
NO
YES 1 1 CATS 0 1
YES
NO
2 0 NICAM 0
1
NO
YES 2 - - - - - - - -
3 0 A2 Stereo 0
1
NO
YES 3 - - - - - - - -
4 0 Tuner manufacturer
0
1
MACO
ALPS 4 - - - - - - - -
5 1 E-W circuit 0
1
NO
YES 5 - - - - - - - -
6 1 Q-linkQ-link 00
11
NONO
YESYES 66 - -- - - -- - - -- - - -- -
7 1 TOP TEXT
0
1
YES
NO 7 - - - - - - - -
6

VIDEO & MONO AUDIO BLOCK DIAGRAM
AUDIO OUT 44
Q3102
Q3101
+
SP
-
D372
D371
D370
Q351
9 8
7
3
2
1
IC351
Y-BOARD
CRT
3
2
Y
2
1
3
2
E8
1
E-BOARD
SOUND TRAP
X
602
Q3104
1 AUDIO OUT
2 AUDIO IN
6 AUDIO IN
7 B IN
19 VIDEO OUT
11 G IN
15 R IN
20 VIDEO IN
3 AUDIO OUT
AV 21 PIN SCART
Q602
Q601
3
AUDIO OUT 8
5AUDIO IN
IC251
AUDIO OUTPUT IC
1
E7
V
A
IF2
IF1
51 R OUT
52 G OUT
53 B OUT
VIDEO EXT 42
VIDEO IN 40
VIDEO OUT 38
B IN 48
G IN 47
R IN 46
28 AUDIO OUT
QSS OUT 35
24 IF2
JK3101
X102 23 IF1
IC601
UOC
TUNER
7
HEADPH

POWER SUPPLY & DEFLECTION BLOCK DIAGRAM
64
D003
D002
MB 5
V
TU2 33
V
TUNER
D1205
8V
5V
D554
D552
31
IC852
31
IC851
HEATER
G1
TO RGB
INPUTS
6
5
E8
3
1
E5
6
5
Y
2
E-BOARD
Q552
D403
+5V
D601
+8V
D606
+190V
D603
Q603
+5V
STANDBY
E1 16
D553
Q401 Q402
D402
D401
D559
T552
FBT
61
3 5 8
10
9 4
6
4
2
1
E4
D752
HOT
D557
D556
Q551
D510
D501
T553
Q501
Q753
D851
F851
D751
D701
V+ 22
V- 21
HOUT 33
FBI/SCO 34
PROT 36
IBL 50
BCL 49
39 VP 14 VCC 20 AVL/EW 54 VDDA 56 VDDC 61 VDDP
IC601
UOC
2 5
3
7 1
VERTICAL
OUTPUT
IC451
Q752
Q751
Q702
Q701
IC251
9
AUDIO
OUTPUT
Q852
D852
Q851
D853
F852 F853
1
2IC702
6IC701
5
S1
S4
S5 S3
P1
B2
T802
P2 B1 S2
D805
D806
D811
D813
D804
D812
21
IC802
R804
1
4
5
3
IC801
POWER
SUPPLY
IC601 PIN 1
POWER ON/OFF
R1205
Q1204
5V STANDBY
R1202
13
IC1201
1
IC1202
3
8
IC1103
EAROM
VCC
IC1104
REMOTE IN
~
D1201
~
+
Q1201
D1202
D801
E3 21
Line
Filte
r
E2
~
D802
~
+
RL801
1
3 4
2
T801
S1S2
P1
P2
S801
F801
2
1
D350
Q351
9
8
7
5
IC351
Y-BOARD
CRT
3
1
Y
3
8
Mains In
Degauss Coil

CONTROL BLOCK DIAGRAM
CRT
5
Y
2
Y-BOARD
IC351
7
8 9
D350
IC601
1 STANDBY
UOC
REM IN 64
Q1102
X
601
2 SCL 3 SDA
6 KEYSCAN
8 SLOW SW
11 MUTE2
27 AGC
XTAL 59
XTAL 58
IBL 50
BCL 49 FBL 45
PROT 36
D1107
Q1107
D1104
+5V
STANDBY
AV 21 PIN SCART
16 FAST SW
8 SLOW SW
SWITCHING
MATRIX
Q1109
D1106
Q1110
Q1204
Q1201
RL801
TUNER
SDA
SCL
IC1103
EAROM
5
SDA
IC1104
REMOTE IN
T552
IC251
AUDIO
OUTPUT
3 MUTE
6
SCL
3FBT
Q255
Q253
5
E8
E-BOARD
2
E1
3 4
Q603
Q401 Q402
Q-LINK OUT 63
Q-LINK IN 62
Q1106 Q1103
Q1104 Q1105
10 Q-LINK
AGC
5
9

PARTS LOCATION
NOTE:
The numbers on the exploded view below
refer to the exploded view section of the
Replacement Parts List.
16 20
3 7
5
13
6
19
18
11
17
15
1
14
4
2
10 8
12
9
10

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)86() 757
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',2'(' 0$ $7$
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',2'(' 65$7
',2'(' 65$7
',2'(' 65$7
',2'(' 667
',2'(' 667
',2'(' 667
',2'(' 667
',2'(' (5$9
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',2'(' 65$7
',2'(' 07=-7$
',2'(' 65$7
',2'(' 667
',2'(' 65$7
',2'(' (89
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',2'(' 7965+)9
',2'(' 79658$0/)$
',2'(' 65$7
',2'(' 07=-7$
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3+272&283/(5' 6)+$3
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',2'(' 0$7%7$
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',2'(' $89
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3+272&283/(5' 6)+$3
',2'(' 65$7
',2'(' 65$7
',2'(' 07=-7'
',2'(' 58/)$
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',2'(' 667
',2'(' 65$7
',2'(' 667
',2'(' 07=-7'
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75$16,67256
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60&$5%5 (5-*(<-9   .
60&$5%5 (5-*(<-9   
60&$5%5 (5-*(<-9   
60&$5%5 (5-*(<-9   
60&$5%5 (5-*(<-9   .
60&$5%5 (5-*(<-9   .
60&$5%5 (5-*(<-9   
60&$5%5 (5-*(<-9   
60&$5%5 (5-*(<-9   
60&$5%5 (5-*(<-9   
60&$5%5 (5-*(<-9   
60&$5%5 (5-*(<-9   
60&$5%5 (5-*(<-9   
60&$5%5 (5-*(<-9   .
60&$5%5 (5-*(<-9   .
60&$5%5 (5-*(<59  
60&$5%5 (5-*(<-9   .
60&$5%5 (5-*(<-9   .
60&$5%5 (5-*(<-9   .
60&$5%5 (5-*(<-9   .
&$5%215 (5'67-7   .
60&$5%5 (5-*(<-9   .
60&$5%5 (5-(1)9   .
0(7$/5 (523.)   .
60&$5%5 (5-*(<-9   
60&$5%5 (5-*(<-9   
60&$5%5 (5-*(<-9   .
60&$5%5 (5-*(<-9   
60&$5%5 (5-*(<-9   
60&$5%5 (5-*(<-9   
60&$5%5 (5-*(<-9   .
60&$5%5 (5-*(<-9   .
60&$5%5 (5-*(<-9   .
60&$5%5 (5-*(<-9   .
&$5%215 (5'67-7   
60&$5%5 (5-*(<-9   .
60&$5%5 (5-*(<-9   .
60&$5%5 (5-*(<-9   .
60&$5%5 (5-*(<-9   .
60&$5%5 (5-*(<-9   .
60&$5%5 (5-*(<-9   .
60&$5%5 (5-*(<-9   
0(7$/5 (5*6-3   
60&$5%5 (5-*(<-9   
60&$5%5 (5-*(<-9   .
60&$5%5 (5-*(<-9   .
60&$5%5 (5-*(<-9   .
60&$5%5 (5-*(<-9   .
60&$5%5 (5-*(<-9   .
60&$5%5 (5-*(<-9   .
&$5%215 (5'67-7   .
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60&$5%5 (5-*(<-9   .
)86,%/(5 (54+-53   5
60&$5%5 (5-*(<-9   
0(7$/5 (5*6-3   .
60&$5%5 (5-*(<-9   .
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281'5 (5)=.5   5
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&$5%215 (5'67-7   .
&$5%215 (5'67-7   .
&$5%215 (5'67-7   .
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&$5%215 (5'67-7   .
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&$5%215 (5'67-7   .
&$5%215 (5'67-7   
&$5%215 (5'67-7   
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&$5%215 (5'67-57   5
&$5%215 (5'67-7   
&$5%215 (5'67-7   .
&$5%215 (5'67-7   .
60&$5%5 (5-*(<-9   
60&$5%5 (5-*(<-9   
60&$5%5 (5-*(<-9   .
60&$5%5 (5-*(<-9   .
60&$5%5 (5-*(<-9   .
60&$5%5 (5-*(<-9   .
60&$5%5 (5-*(<-9   .
60&$5%5 (5-*(<-9   .
60&$5%5 (5-*(<-9   .
60&$5%5 (5-*(<-9   .
60&$5%5 (5-*(<-9   
60&$5%5 (5-*(<-9   
60&$5%5 (5-*(<-9   
60&$5%5 (5-*(<-9   
60&$5%5 (5-*(<-9   
60&$5%5 (5-*(<-9   
60&$5%5 (5-*(<-9   
60&$5%5 (5-*(<-9   
60&$5%5 (5-*(<-9   
60&$5%5 (5-*(<-9   .
60&$5%5 (5-*(<-9   .
60&$5%5 (5-*(<-9   0
60&$5%5 (5-*(<-9   .
60&$5%5 (5-*(<-9   .
60&$5%5 (5-*(<-9   .
60&$5%5 (5-*(<-9   
60&$5%5 (5-*(<-9   .
60&$5%5 (5-*(<-9   .
60&$5%5 (5-*(<-9   .
60&$5%5 (5-*(<-9   .
60&$5%5 (5-*(<-9   .
60&$5%5 (5-*(<-9   .
60&$5%5 (5-*(<-9   .
60&$5%5 (5-*(<-9   .
60&$5%5 (5-*(<-9   .
60&$5%5 (5-*(<-9   .
&$5%215 (5'67-7   
60&$5%5 (5-*(<-9   .
60&$5%5 (5-*(<-9   .
&$5%215 (5'67-7   
60&$5%5 (5-*(<-9   .
60&$5%5 (5-*(<-9   .
60&$5%5 (5-*(<-9   
60&$5%5 (5-*(<-9   .
60&$5%5 (5-*(<-9   .
60&$5%5 (5-*(<-9   .
60&$5%5 (5-*(<-9   .
60&$5%5 (5-*(<-9   
&$5%215 (5'67-7   
60&$5%5 (5-*(<-9   
60&$5%5 (5-*(<-9   
60&$5%5 (5-*(<-9   
60&$5%5 (5-*(<-9   
60&$5%5 (5-*(<-9   
&$5%215 (5'67-7   
60&$5%5 (5-*(<-9   .
60&$5%5 (5-*(<59  
60&$5%5 (5-*(<-9   .
60&$5%5 (5-*(<-9   .
60&$5%5 (5-*(<-9   .
60&$5%5 (5-*(<-9   .
60&$5%5 (5-*(<-9   .
&$5%215 (5'67-7   
60&$5%5 (5-*(<-9   .
60&$5%5 (5-*(<-9   
60&$5%5 (5-*(<-9   
60&$5%5 (5-*(<59  
&$3$&,7256
(/(&7& (&$&0% 9 )
60&$3& (&-9)+= 9  Q)
60&$3& (&-9)+= 9  Q)
(/(&7& 60*&907 9 )
(/(&7& 60*+907 9 )
(/(&7& (&$+0% 9  )
60&$3& (&89+'&; 9 S)
60&$3& (&89+'&; 9 S)
60&$3& (&-9%+. 9  Q)
60&$3& (&-9%+. 9  Q)
60&$3& (&-9%+. 9  Q)
&(5$0,&& (&.5+=) 9  )
(/(&7& (&$&0% 9  )
(/(&7& (&$&+*% 9 )
(/(&7& 60*&907 9 )
(/(&7& (&$90% 9  )
(/(&7& (&$+0% 9  )
(/(&7& (&$++*( 9  )
60&$3& (&-)%+. 9  Q)
60&$3& (&-)%+. 9  Q)
(/(&7& (&$(0% 9  )
&(5$0,&& (&.5+.% 9  Q)
60&$3& (&-9)+= 9  Q)
60&$3& (&89+=); 9  Q)
&(5$0,&& (&. '.%3 .9 Q)
60&$3& (&89+.%; 9 S)
(/(&7& (&$&0% 9  )
60&$3& (&89+&&; 9  S)
(/(&7& (&$++*% 9 )
),/0& (&49+-/ 9  Q)
(/(&7& (&$+05% 9  )
(/(&7& (&$+0% 9  )
(/(&7& ((8)&+% 9  S)
),/0& (&4%-) 9 Q)
60&$3& (&89+-&; 9 Q)
(/(&7& (&$90% 9 )
&(5$0,&& (&.5+.% 9  S)
&(5$0,&& (&.5+.% 9  S)
(/(&7& (&$&05% 9  S)
),/0& (& +-9% 9  Q)
),/0& (&4)-=+ 9  Q)
(/(&7& (&$*+*5% 9  Q)
),/0& (& )-%% 9  Q)
(/(&7& (&$90% 9 )


'HVFULSWLRQ&FW5HI 3DUWV1XPEHU 'HVFULSWLRQ&FW5HI 3DUWV1XPEHU
&(5$0,&& (&.5+.% 9  S)
(/(&7& (&$90% 9 )
&(5$0,&& (&. '.%3 .9 Q)
&(5$0,&& (&.5+0' 9  Q)
(/(&7& (&$&0% 9  )
60&$3& (&-)%+. 9  Q)
60&$3& (&-9%+. 9  Q)
),/0& (&49+-/ 9  Q)
),/0& (&49+-/ 9  Q)
60&$3& (&89+-&; 9 Q)
(/(&7& (&$+0% 9  )
(/(&7& (&$+05% 9  )
60&$3& (&-)%+. 9  Q)
60&$3& (&-9%+. 9  Q)
60&$3& (&-9%+. 9  Q)
60&$3& (&-9%+. 9  Q)
),/0& (&49+-/ 9  )
),/0& (&49+-/ 9  Q)
60&$3& (&89+.%; 9 Q)
(/(&7& (&$&0% 9  )
(/(&7& (&$+05% 9  )
60&$3& (&89+*&* 9  S)
60&$3& (&-9)+= 9  Q)
60&$3& (&89+-&; 9 S)
60&$3& (&89+*&* 9  S)
),/0& (&4%+-) 9  Q)
),/0& (&4%+-) 9  Q)
),/0& (&4%+-) 9  Q)
60&$3& (&-<%+. 9  Q)
60&$3& (&-<%+. 9  Q)
60&$3& (&-)%+. 9  Q)
(/(&7& 60*&907 9 )
(/(&7& 60*&907 9 )
60&$3& (&-9)+= 9  Q)
(/(&7& 60*&907 9 )
60&$3& (&-9)+= 9  Q)
(/(&7& (&$&0% 9  )
(/(&7& 60*&907 9 )
(/(&7& 60*&907 9 )
(/(&7& 60*+907 9 )
(/(&7& (&$+05% 9  )
(/(&7& (&$+0% 9  )
60&$3& (&89+-&; 9  S)
60&$3& (&-9%+. 9  Q)
60&$3& (&-<%+. 9  Q)
(/(&7& (&$+0% 9  )
60&$3& (&-9)+= 9  Q)
(/(&7& (&$++*% 9  )
),/0& (&4%+-) 9 Q)
),/0& (&4%+-) 9  Q)
),/0& (&43-= 9  Q)
),/0& (&43-= 9  Q)
(/(&7& (&$+0% 9 )
),/0& (& )-%% 9  Q)
60&$3& (&-9)+= 9  Q)
60&$3& (&-9)+= 9  Q)
(/(&7& (&$-0% 9  )
&(5$0,&& (&.5+.% 9  S)
&(5$0,&& (&. 1$0( 9  Q)
&(5$0,&& (&. 1$0(& 9 Q)
),/0& (&48$0/$ 9  Q)
&(5$0,&& (&. +38 9  Q)
&(5$0,&& (&. +38 9  Q)
&(5$0,&& (&. +38 9  Q)
(/(&7& (&26*$%% 9  )
(/(&7& (&$++*% 9 )
&(5$0,&& (&.5+.% 9  S)
&(5$0,&& (&.5$.%3 .9 Q)
&(5$0,&& (&. '-%1 N9  S)
&(5$0,&& (&. '.%3 N9  Q)
(/(&7& (&$&+*( 9  )
&(5$0,&& (&. +38 9  Q)
),/0& (&4%+.) 9 Q)
(/(&7& (&$&0% 9  )
&(5$0,&& (&.5+.% 9  S)
60&$3& (&-9)+= 9  Q)
(/(&7& (&$90% 9 )
(/(&7& (&$&0% 9  )
60&$3& (&-9)+= 9  Q)
(/(&7& (&$++*% 9 )
(/(&7& (&$9+*% 9  S)
60&$3& (&-9)+= 9  Q)
60&$3& (&89+-&; 9 S)
(/(&7& 60*&907 9 )
60&$3& (&-9)+= 9  Q)
60&$3& (&89+-&; 9 S)
60&$3& (&89+-&; 9 S)
(/(&7& (&$&0% 9  )
),/0& (&49+-/ 9  Q)
(/(&7& 60*&907 9 )
(/(&7& 60*&907 9 )
60&$3& (&-9)&= 9  Q)
(/(&7& 60*&907 9 )
(/(&7& (&($+18% 9  )
(/(&7& 60*&907 9 )
60&$3& (&-9)+= 9  Q)
60&$3& (&89+.%; 9 Q)
60&$3& (&89+.%; 9 Q)
60&$3& (&89+.%; 9 Q)
60&$3& (&89+.%; 9 Q)
60&$3& (&89+.%; 9 Q)
60&$3& (&89+.%; 9 S)
60&$3& (&89+.%; 9 S)
(/(&7& (&($+18% 9  )
7(50,1$/6$1'/,1.6
$97(50,1$/-. 7-%
6&$5762&.(7-. 7-%(
&5762&.(76 7-6&
6:,7&+(6
6 ,7&+6 (6%6%
6 ,7&+6 (945
6 ,7&+6 (945
6 ,7&+6 (945
6 ,7&+6 (945
6 ,7&+6 (945
5(/$<6
5(/$<5/ '-'0


16
NOTES

SCHEMATIC DIAGRAMS FOR MODEL
TX-21AT1P
(Z8T CHASSIS)
NOTE
1. RESISTOR
All resistors are carbon ¼W resistor, unless marked otherwise.
Unit of resistance is OHM (Ω) (k=1,000, M=1,000,000)
2. CAPACITORS
All capacitors are ceramic 50V unless marked otherwise.
Unit of capacitance is µF unless otherwise stated.
3. COIL
Unit of inductance is µH, unless otherwise stated.
4. TEST POINT
Test Point Position
5. EARTH SYMBOL
Chassis Earth (Cold)
Line Earth (Hot)
6. VOLTAGE MEASUREMENT
Voltage is measured by a d.c. voltmeter.
Measurement conditions are as follows:
Power source a.c. 220V-240V, 50Hz
Receiving Signal Colour Bar signal (RF)
All customer controls Maximum position
7.
Indicates the Video signal path
Indicates the Audio signal path
These schematic diagrams are the latest at time of printing and are subject to change without notice.
REMARKS
a. Do not touch the hot part, or the hot and cold parts at the same time, as you are liable to a shock hazard.
b. Do not short circuit the hot and cold circuits as electrical components may be damaged.
c. Do not connect an instrument, such as an oscilloscope, to the hot and cold circuits simultaneously as this may cause
fuse failure. Connect the earth of the instruments to the earth connection of the circuit being measured.
d. Make sure to disconnect the power plug before removing the chassis.
NOTE
1. The Power Supply Circuit contains a circuit area, which uses a separate power supply to isolate the earth connection.
The circuit is defined by HOT and COLD indications in the schematic diagram. All circuits, except the Power Circuit, are
COLD.
IMPORTANT SAFETY NOTICE
Components identified by mark have special characteristics
important for safety. When replacing any of these components, use
only manufacturers' specified parts.
17

18

19

CONDUCTOR VIEWS FOR MODEL TX-21AT1P
E - BOARD TNP8EE011
65 21
F
8
A
B
C
D
E
3
47
TRAN'S D510 B6 D1107 F6
Q253 E4 D551 A6 D1201 F6
Q255 E4 D552 B7 D1202 F6
Q401 A4 D553 A6 D1205 F5
Q402 A4 D554 B6 D3101 A4
Q501 B6 D555 A6
Q551 C8 D556 B8
Q552 A5 D557 C8 I.C.'S
Q601 B2 D559 A6 IC251 E4
Q602 A2 D601 A2 IC451 A5
Q603 A2 D603 A2 IC601 B2
Q701 B5 D606 A1 IC701 C5
Q702 C5 D701 C5 IC702 C4
Q751 C6 D702 B5 IC801 D7
Q752 C7 D703 C5 IC802 D6
Q753 C7 D704 B5 IC851 B4
Q851 E5 D705 B5 IC852 C4
Q852 E6 D706 B5 IC1103 D3
Q1102 F5 D751 C6 IC1104 F7
Q1103 B3 D752 C7 IC1201 F5
Q1104 B3 D753 C6 IC1202 F5
Q1105 B3 D754 C6
Q1106 B3 D755 C6
Q1107 F7 D801 E7 T.P.’S
Q1109 F6 D802 E7 TP1 F5
Q1110 F6 D803 D7 TP2 A7
Q1201 E6 D804 D6 TP3 A6
Q1204 F6 D805 D6 TP4 B6
Q3101 D1 D806 E6 TP5 D1
Q3102 D1 D807 D6 TP6 A6
Q3104 A3 D808 D7 TP8 F5
D809 C7 TP10 E1
DIODES D810 D6 TP13 B6
D002 A5 D811 D7 TP14 E5
D003 A5 D812 D6 TP15 E5
D260 E4 D813 D7 TP16 D4
D261 E4 D814 D6 TP17 B4
D262 E4 D851 D4 TP18 B4
D401 A5 D852 E5 TP19 A5
D402 A5 D853 E5 TP20 A1
D403 A4 D1101 D3 TP21 C3
D501 C5 D1104 F8 TP22 A7
D502 B5 D1106 F6 TPE11 D8
20