Panasonic TX-21CK1 / TX-28LK1P / TX-25LK1P / TX-28LK1C / TX-25LK1C / TX-28SK1C Service Manual ▷ View online
SCHEMATIC DIAGRAMS FOR MODEL
TX-21CK1
(Z8 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.
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.
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CONDUCTOR VIEWS FOR TX-21CK1
E - BOARD TNP8EE011
TRAN'S
DIODES
D1106
A2
Q253
B4
D002
E4
D1107
A3
Q255
B5
D003
E4
D1201
A3
Q401
E4
D260
B4
D1202
A3
Q402
E4
D261
B4
D1205
A3
Q501
D3
D262
B4
D3101
E5
Q551
D1
D401
E4
Q552
E3
D402
E3
I.C.'S
Q601
D6
D403
E4
IC251
B4
Q602
E6
D501
C4
IC451
E3
Q603
E6
D502
D4
IC601
D6
Q851
B3
D510
E3
IC801
C2
Q852
B3
D551
E3
IC802
C3
Q1101
D5
D552
D2
IC851
D4
Q1102
A3
D553
E2
IC852
D4
Q1107
A2
D554
E3
IC1102 D5
Q1109
A3
D555
E3
IC1103 B5
Q1110
A3
D556
D1
IC1104 A2
Q1201
B3
D557
D1
IC1105 B6
Q1204
A3
D559
E2
IC1201 A3
Q2001
B7
D601
E6
IC1202 A3
Q2002
B7
D603
E6
IC2001 B5
Q2003
B7
D606
E6
Q2004
B7
D801 B2
T.P.'S
Q3104
E4
D802
B2
TP1
A3
Q3105
E6
D803
C2
TP2
E2
Q3106
E6
D804
C3
TP3
E3
D805
B3
TP4
E3
D806
B3
TP5
B7
D807
C3
TP6
E3
D808
C2
TP8
A3
D809
C2
TP10
B7
D810
B3
TP13
E3
D811
B2
TP14
B4
D812
C2
TP15
B3
D813
B2
TP16
C4
D814
C3
TP17
D4
D851
C4
TP18
D4
D852
B4
TP19
E3
D853
B4
TP20
E7
D1101
B5
TP21
D5
D1104
A1
TP22
E2
TPE11
B1
1
2
3
4
5
6
7
A
B
C
D
E
20
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