JVC AV-28EH1SUG Schematic

SCHEMATIC DIAGRAMS

COLOUR TELEVISION

5217220037

AV-28EH1SUG

CD-ROM No.SML200309

No.52172

2003/7

AV-28EH1SUG

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 tester (4)Os c illo scope sweeping time

(5)Voltage values

Sin ce th e vo l tage val ue s of si gn a l cir cuit va ry to s ome exte nt according to adjustments, use them as reference values.

: Original setting position when shipped

:DC 20k :H :V

:Others

:All DC voltage values

20µS/div 5mS/div

Sweeping time is specified

3.INDICATION OF PARTS SYMBOL [EXAMPLE]

In the PW board

:R1209

R209

Type

No indication

MM PP

MPP

MF TF BP

TAN

(3) Coils

No unit Others

(4)Power Supply

Respective voltage values are indicated

(5)Test point

:T est point

(6)Con necti ng method

:Ceramic capacitor

:Metalized mylar capacitor :Polypropylene capacitor :Metalized polypropylene capacitor

:Metalized film capacitor :Thin film capacitor :Bipolar electrolytic capacitor :Tantalum capacitor

:As specified

:B1

:9V

:Connector

:Receptacle

:B2 (12V)

:5V

:Only test point display

:Wrapping or soldering

4.INDICATIONS ON THE CIRCUIT DIAGRAM

(1)Resistors

Resistance value No unit :[

K M

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

Type No indication OMR MFR MPR UNFR FR

Composition resistor 1/2 [W] is specif ied a s 1/2S or Co mp.

(2)Capacitors

Capacitance value

1 or higher :[pF]

less than 1 Withstand voltage

No indi cation :DC 50[V] Others :DC withstand voltage [V] AC indicated

Electrolytic Capacitors

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

]

:[K

]

:[M ]

:Carbon resistor :Oxide metal fil m r esistor :Meta l film resistor :Metal plate resistor :Uninflammable resistor :Fusible resistor

:[µF]

:AC withstand voltage [V]

(7)Ground symbol

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

5.NOTE FOR REPAIRING SERVICE

This model's power circuit is partly di fferent 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 subject to change for improvement without any notice.

NOTE Due improvement in performance, some part numbers show in th e circui t diagram ma y not agree with those indi cate d in the par t list. When ordering parts, please use the numbers that appear in the Parts Li st.

No.52172

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