Panasonic TX-21JT2P User Manual

SPECIFICATIONS
ORDER No. SM-03002
Colour Television
TX-21JT2P TX-21JT2P/B
Z-M3L Chassis
Power Source: 220-240V a.c., 50Hz
Power Consumption: 60W
Aerial Impedance: 75 unbalanced, Coaxial Type
Receiving System: PAL-B/G, DK , PAL-525/60
SECAM B/G, D/K M.NTSC NTSC (AV only)
Receiving Channels:
VHF E2-E12 VHF H1-H2 (ITALY) VHF A-H (ITALY) VHF R1-R2 VHF R3-R5 VHF R6-R12 UHF E21-E68 CATV (S01-S05) CATV S1-S10 (M1-M10) CATV S11-S20 (U1-U10) CATV S21-S41 (HYPERBAND)
Intermediate Frequency: Video/Audio
Video 38.9MHz, 34MHz Audio 32.9MHz, 33.16MHz, 33.4MHz Colour 34.47MHz (PAL)
34.5MHz, 34.65MHz (SECAM)
Video/Audio Terminals:
AV1 IN Video (21 pin) 1V p-p 75
Audio (21 pin) 500mV rms 10k
RGB (21 pin)
Audio (RCAx1) 500mV rms 10k Video (RCAx1) 1V p-p 75
AV1 OUT Video (21 pin) 1V p-p 75
Audio (21 pin) 500mV rms 1k
High Voltage: 29kV ± 1kV
Picture Tube:A51QAE320X47P 51cm
Audio Output: 3W (Music Power)
8 Impedance
Headphones: 8 Impedance
3.5mm
Accessories supplied : Remote Control
2 x R6 (UM3) Batteries
Dimensions:
Height: 482mm Width: 506mm Depth: 484mm
Net weight: 20kg
Specifications are subject to change without notice. Weights and dimensions shown are approximate.
CONTENTS
SAFETY PRECAUTIONS ......................................................................................................................................................... 2
SERVICE HINTS....................................................................................................................................................................... 3
ALIGNMENT SETTINGS .......................................................................................................................................................... 4
WAVEFORM PATTERN TABLE............................................................................................................................................... 5
BLOCK DIAGRAMS.................................................................................................................................................................. 6
PARTS LOCATION................................................................................................................................................................... 7
REPLACEMENT PARTS LIST.................................................................................................................................................. 8
SCHEMATIC DIAGRAMS....................................................................................................................................................... 12
CONDUCTOR VIEWS ............................................................................................................................................................ 17
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 30kV 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 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 1,4Vrms. 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
ΩΩΩΩ
2k
10 Watts
TO INSTRUMENT'S EXPOSED METALLIC PARTS
Fig. 1.
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 30kV 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. 29kV ± 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.
WATER PIPE
(
EARTH)
2
SERVICE HINTS
How to remove the rear cover
1. Remove the 5 screws as shown in Fig.2.
SCREWS
LOCATION OF CONTROLS
SCREWS
Fig. 2.
AV Board
Main Board
CRT Board
Focus
Screen
3
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
1
2
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
Item
Cut off (VG2)
Vertical slope
LED ON , LED OFF
Range
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
DY
FB401
+B
2
1
H.DRV+B
180V
3
6
F
F
E-2
AC220-240V
50Hz
CRT
V801
PELAY
RY501
HV
D501, D502
D503, D504
S
1
4
7
8
UP
TV/AV
DOWN
BLOCK DIAGRAM
11
IF
1
7
BUFFER
Q602
V.OUTPUT
IC401 TDA8357J
STR
FUNCTION
7
KEY_IN
IF2
24
IF1
23
6
7
OUTA
INB
INA
2
1
21
22
V-
V+
RF_AGC
H.OUTPUT
Q401
H.DRIVE
Q405
33
H_OUT
J801
8
7
VOC(3)
VI(1)
VIDEO AMP
IC801 TDA6107Q
B_OUT
6
11
8
9
VOC(2)
VOC(1)
VI(2)
VI(3)
213
525351
G_OUT
R_OUT
180V
6VDD
42
R_IN
CVBS/Yin
474648
G_IN
B_IN
T502
D529, D532
D533, D534
28
35
EXT.A.IN
AUDIO_OUT
6
AT+5.6V
J701
Q601
1
8
AT3.5V
BUFFER
2
3
T501
6
12
14
+B
SOUND+B
17
1
8V REG. IC
3
5V REG. IC
IC502 KIA7808API
P.CON+8V
12
J702
FRONT VIDEO
11715
18
1
3
IC501 KIA7805API
P.CON+5V
1
J703
2
FRONT AUDIO
TU001
SCL SDA BPL AGC
5
4
SPEAKER
SDA3SCL
MICON/CHROMA
IC101 TDA9361_401-61
P.CON+5V
SDA5SCL
EEPROM
IC199
S-24C16AFJA-TB-01
VCC 14
AM-OUT 44
X101
12MHz
X_TAL
Vp1
59
39
Vddp
3.3V(A)
VDD
LED1
2
10
D101
54
56
61
IR
64
1
X_TAL
58
6
AT3.5V
OS101
P.CON+8V
J1001
7
HEADPHONE_JACK
6
SOUND+B
342
5
NC
1 2
4
1
+
-
SP351
6
SOUND AMP
IC1001
AN7523
E-1
PARTS LOCATION
NOTE:
The numbers on the exploded view below refer to the mechanical section of the Replacement Parts List. This diagram is used for representative purposes only.
12
3
7
15
13
14
9
1
2
6
11
5
10
16
4
8
7
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