TX-21AT1P - Panasonic TV Service Manual (repair manual). Page 17

 

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. 
 

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. 
 

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. 

Components identified by     

 mark have special characteristics 

important for safety. When replacing any of these components, use 
only manufacturers' specified parts.