Panasonic TX-21AT1P Service Manual ▷ View online
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 (
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
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
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
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.
only manufacturers' specified parts.
17
1
8
1
9
CONDUCTOR VIEWS
FOR MODEL TX-21AT1P
E - BOARD TNP8EE011
6
5
2
1
F
8
A
B
C
D
E
3
4
7
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
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
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
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
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
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