JVC AV-29V514/B Section Troubleshooting, Self Check Functions Outline, Self Check Items

Page 31

SECTION 5

TROUBLESHOOTING

5.1SELF CHECK FUNCTIONS

5.1.1 OUTLINE

This model has self check functions given below. When an abnormality has been detected, the SUB POWER is turned off and POWER

LED

flashes to inform of the failure. An abnormality is detected by the signal input state of the control line connected to the

microcomputer.

5.1.2

SELF CHECK ITEMS

Check item

Details of detection

Method of detection

State of abnormality

B1 over-current protection

An over-current on the low B1

The

main

microcomputer

When an abnormality has been

line is detected.

detects the possible abnormality

detected, the SUB-POWER is

at 24-msec. intervals and judges

turned

off.

While

the

SUB-

CRT neck broken protection

Operation of CRT neck

the results in every 16 time. Of

POWER is being turned off, the

protection circuit.

the 16 times, if NG is detected

POWER key

on

the

remote

more than 9 times, it is judged

control

unit

is

not

operational

that there is an abnormality.

until the power cord is

disconnected

and

connected

again.

5.1.3 SELF CHECK INDICATING FUNCTION

When an abnormality has been detected at about 5 seconds after the power was turned on, the SUB POWER is turned off immediately and the POWER LED flashes.

	After about	Detection of
	5 seconds	an abnormality
Power on	Start of	Flashing LED
Port	detection
		SUB-POWER OFF

[ INDICATION BY THE POWER LED]

Item	LED flashing intervals

B1 over-current protection / CRT neck broken protection	0.3 seconds

(No.YA139)1-31

Image 31

Contents AV-29V514/B Table of ContentsItems Contents SpecificationAlternate Check Method Section PrecautionSafety Precautions Leakage Current CheckFeatures Section Specific Service InstructionsFunctions „ Remote Control Unit Output Terminal „ Front Panel Controls„ Rear Terminal VIDEO-1 Input Terminal Component VIDEO-2 Input TerminalPin no Pin name Remark Main CPU Main PWB IC701 PIN FunctionSection Disassembly Main PWB Speaker FBT Procedure for Replacing Memory IC Replacement of Memory ICSetting item Setting content Setting value Factory Setting Value „ Setting of System Constant SETLanguage Thai Tint „ Setting of Basic FunctionsPower Edit / ManualTransistors, diodes, variable resistors, etc Replacement of Chip ComponentHow to install Chip parts Resistors, capacitors, etc Soldering IronAdjustment Items Section AdjustmentAdjustment Preparation Presetting Before AdjustmentFront Control PWB ASS’Y 2/2 Adjustment LocationsMethod of Setting Notes Basic Operation in Service MenuService Menu Items Basic Operation in Service Menu HOW to Enter Service MenuMHz Service Menu Flow ChartDelay Point Adjustment ProcedureFocus Adjustment If Circuit AdjustmentsComponent White Balance Video Circuit AdjustmentsWhite Composite White BalanceSUB SUB BrightContrast PAL Colour SUB ColourSecam Colour SUB Tint Audio SettingPAL V. Slope Deflection Circuit Adjustments„ Compress OFF SlopePAL H. Position HeightPAL V. Height Ntsc V. HeightTrapezium Side PINPAL Side PIN Ntsc Side PINParallel Corner PINPAL Corner PIN Ntsc Corner PINSelect Picture Features Ntsc Trapezium PIN PAL Trapezium PINVSM VSM Preset SettingPreset „ Video 2 SET ComponentPurity and Convergence „ Purity Adjustment „ Dynamic Convergence Adjustment „ Static Convergence AdjustmentSelf Check Items Section TroubleshootingIndication by the Power LED Self Check Functions Outline32 No.YA139 WPC