JVC AV-16N71/VT, AV-20N41/BK Schematics

SCHEMATIC DIAGRAMS

COLOUR TELEVISION

AV-20N41 AV-16N71

AV-20N41/BK AV-16N71/VT

CD-ROM No.SML200111

BASIC CHASSIS

CONTENTS

NOTE ON USING CIRCUIT DIAGRAMS SEMICONDUCTOR SHAPES BLOCK DIAGRAM CIRCUIT DIAGRAMS PATTERN DIAGRAMS

2-1 2-2 2-3 2-5 2-13

No.51924

Nov. 2001

STANDARD CIRCUIT DIAGRAM

NOTE ON USING CIRCUIT DIAGRAMS

1.SAFETY

The components identified by the symbol and shading are critical for safety. For continued safety replace safety critical components only with manufactures recommended parts.

2.SPECIFIED VOLTAGE AND WAVEFORM VALUES

The voltage and waveform values have been measured under the following conditions.

(1)Input signal : Colour bar signal

(2)Setting positions of each knob/button and variable resistor

(3)Internal resistance of test er

:DC 20k

(4)Oscilloscope sweeping time

20µS/div

5mS/div

:Others

Sweeping time is specified

(5)Voltage values

:All DC voltage values

Since the voltage values of signal circuit vary to some extent according to adjustments, use them as reference values.

3.INDICATION OF PARTS SYMBOL [EXAMPLE]

In the PW board

:R1209

R209

4.INDICATIONS ON THE CIRCUIT DIAGRAM

(1)Resistors

Resistance value No unit :[

]

:[K

]

Rated allowable power No indication :1/ 16 [W] Others :As specified

Type No indication

:Carbon resistor

OMR

:Oxide met al fil m resistor

MFR

:Metal film resist or

MPR

:Metal plate resistor

UNFR

:Uninflammable resistor

:Fusible resistor

Composition resistor 1/2 [W] is specified as 1/2S or Comp.

(2)Capacitors

: Original setting position when shipped

5.NOTE FOR REP AIRING SERVICE

This model's power circuit is par tly different in the GND. The difference of the GND is shown by the LIVE : ( ) side GND and the ISOLATED(NEUTRAL) : ( ) side GND.Therefore, care must be taken for the following points.

(1)Do not touch the LIVE side GND or the LIVE side GND and the ISOLATED(NEUTRAL) side GND simultaneously. If the above caution is not respected, an electric shock may be caused. Therefore, make sure that the power cord is surely removed from the receptacle when, for example, the chassis is pulled out.

(2)Do not short between the LIVE side GND and ISOLATED(NEUTRAL) side GND or never measure with a measuring apparatus measure with a measuring apparatus ( oscilloscope, etc.) the LIVE side GND and ISOLATED(NEUTRAL) side GND at the same time. If the above precaution is not respected , a fuse or any parts will be broken.

Since the circuit diagram is a standard one, the circuit and circuit constants may be subjec t to chang e for improvement withou t any notice.

NOTE Due improvement in performance, some part numbers show in the circuit diagram may not agree with those indicated in the part list. When ordering parts, please use the numbers that appear in the Parts List.

Type

:Metalized mylar capacitor

:Polypropylene ca pacitor

MPP

:Metalized polypropylene capacitor

:Metalized f ilm capacitor

:Thin film capacitor

:Bipolar electrolytic capaci tor

TAN

:Tantalum capacitor

(3)Coils

No unit

Others

:As specified

(4)Power Supply

:B1

:9V

:5V

Respective voltage values are indicated

(5)Test point

:T est po int

:Only test point display

(6)Connec ting method

:Connector

:Wrapping or s oldering

:Receptacle

(7)Ground symbol

:LIVE side ground :ISOLATED(NEUTRAL) side g round :EARTH ground :DIGITAL ground

:[M ]

Capacitance value

1 or higher :[pF]

less than 1

:[µF] Withstand voltage No indication :DC 50[V]

Others :DC withstand voltage [V] AC indicated

:AC withstand voltage [V]

Electrolytic Capacitors

47/50[Example]:Capacitance value [µF]/withstand voltage[V]

No indication :Ceramic capacitor

:B2 (12V)