Is the EE signal normal? | LG Electronics TL-AT130M specs

SECTION3 ELECTRICAL

ELECTRICAL TROUBLESHOOTING GUIDE

(3) When the C(Color) signal doesn't appear on the screen in PB Mode

Is 5V applied to the IC301

Pin 16, 40, 55, 58, 87?

Is the Color Rotary signal applied to

the IC301 Pin 10?

YES

NO

NO

Check the line of the 5.3VA

Line. (Power Circuit)

Check the Color Rotary Circuit. (IC501 pin 98)

Is Color Rotary "H" about

1.6V?

YES

NO		Check the Color Rotary level.
		(Check the R302, R303)
		(Check the R302, R303)

Does the Color signal appear at

the IC301 Pin 71?

YES

Replace the IC301.

NO	Does the X301(4.43MHz) or
	Does the X301(4.43MHz) or
	X302(3.58MHz) oscillate?

YES

Does the Color signal appear at the IC301 Pin 61?

YES

Check the circuit of the

IC301 Pin 35, 62.

NO

NO

NO

Replace the X301 or the X302.

Check the Color Pass. (Check the Q304)

Replace the IC301.

(4) When the Video signal doesn't appear on the screen in REC Mode.

Is the EE signal normal?

NO

Check EE Mode.

Is 5V applied to the IC301	NO		Check the line of the 5.3VA
Pin 16, 40, 55, 58, 87?			Line.(Power Circuit)
Pin 16, 40, 55, 58, 87?			Line.(Power Circuit)

YES

Does PB Mode operate

normally?

YES

Does the RF signal appear at

the IC301 Pin 12?

YES

Does the REC RF signal appear at

the IC301 Pin90?

YES

Check the Drum &

Drum Connector

NO

NO

NO

Check PB Mode.

Is the REC 'H' signal (about 4V)applied to the IC301 Pin 30?

YES

Check REC Luminance

Pass & Color Pass.

Check the circuit of the

IC301 Pin 90, 92, 94

NO

YES

YES

Check the System of REC 'H' (the IC501 Pin 30 / the D301)

Replace the IC301.

3-8

Image 18

LG Electronics TL-AT130M service manual Is 5V applied to the IC301 Pin 16, 40, 55, 58, 87?, Is the EE signal normal?

Contents

KEY Table of Contents Summary Front Rear Indicator Panel VCR Function Indication Terminal Signal Levels IN/OUT Description Summary Critical Parts Replacing Time Table Cabinet & Main Frame Exploded Views Cabinet & Main Frame Section Parts list Cabinet and Main Frame Section Packing Accessory Section Parts list Packing & Accessory Section PG Adjustment Connection chart of PG adjustment Power CircuitSMPS No 5.3 a No 24 No 5.2 a to AVCP, Bias When the drum moter stop Video is unstable in PB modePB mode Servo Circuit When the capstan motor stops Capstan motor stops No Video in EE Mode No Video in EE ModeC Circuit Clean the Drum Check the System Circuit IC501 Pin Pin 16, 40, 55, 58, 87? Is the EE signal normal? Is 5V applied to the IC301 Pin 16, 40, 55, 58, 87? No sound in PB Mode No sound in EE Mode No sound in PB ModeNo sound in EE Mode Audio Circuit No sound in REC Mode No sound in REC Mode SYSTEM/KEY Circuit Auto Stop No cassette tape loadingAuto Stop No OSD display No Key displayOSD Circuit No F.OSD display Electrical Block & Circuit Diagrams Power Block Diagram Power Clrcuit Diagram Audio Block Diagram C Block Diagram V Circuit Diagram Electrical Block & Circuit Diagrams System Block Diagram Electrical Block & Circuit Diagrams System Clrcuit Diagram Jack Clrcuit Diagram KEY-BOARDCLRCUIT Diagram Electrical Printed Circuit Diagrams KEY 1 P.C.BOARD KEY 2 P.C.BOARD Jack P.C.BOARD Mechanism Top View Bottom View Part Fixing Type Drum Assembly Fig. A-1-1 Drum Motor Plate Top Fig. A-2-1 Fig. A-2-4 Bracket Assembly L/D Motor Fig. A-2-4 Gear Assembly Rack F/L Fig. A-2-5Holder Assembly CST Fig.A-2-2 Arm Assembly F/L Fig. A-2-6 Base Assembly A/C Head Arm AssemblyCleaner Head F/E Fig. A-3-2 Arm Assembly Tension Fig. A-4-3 Brake Assembly T Fig. A-4-1Brake Assembly RS Fig. A-4-2 Reel S / Reel T Fig. A-4-4 Arm Assembly Pinch Fig. A-5-3 Opener Lid Fig. A-5-2Lever T/up Fig. A-5-4 Arm T/up Fig. A-5-5 Brake Assembly Capstan Lever F/R Fig. A-6-3 Lever Spring Fig. A-7-6 Gear Sector Fig. A-7-3Lever Tension Fig. A-7-5 Just lift the Plate Slider up Gear Assembly P2 Fig. A-8-1/ Gear Assembly P3 Fig. A-8-2 Base Assembly P2 Fig. A-8-3/ Base Assembly P3 Fig. A-8-4 Base Tension Fig. A-9-2 Base Loading Fig. A-9-1 Arm Assembly Idler Fig. A-9-3Arm Assembly Idler Base Tension Base Loading Deck Mechanism Adjustment Mechanism Alignment Position Check Fig. C-1 Mechanism Condition Checking TorqueTest Equipment/ Fixture Test Conditions Torque Gauge 600g.cm ATG Cassette Torque Meter SRK-VHT-303 Guide Roller Height Adjustment Head Assembly Audio/Control A/C Head AdjustmentAdjustment Procedure/Diagrams Head Base Adjustment Procedure Adjustment Diagram Value AdjustmentPrecise Adjustment Azimuth adjustment 1KHZ 7KHZ Adjustment after Replacing Drum Assembly Video Heads Check the Tape Travel after Reassembling Deck Assembly Check before starting repairs Maintenance Procedure Required MaintenanceScheduled Maintenance Cleaning Greasing Chassis Bottom Chassis TopGear Sector Gear Cam Base Loading Gear Drive Lever, F/R, Base, Tension Gear AY, P2 & P3Base, Tension Mechanism Troubleshooting Guide Auto Stop PLAY/CUE/REV Nono Is the Belt ok? Front Loading Mechanism Cassette does not load Exploded Views Moving Mechanism A11 NSP Not Service Part RUN DateParts Section LOCA.NO Description Specification Remarks Description SpecificationAssembly Section Remarks Screw Buzzer LOCA.NO Description Specification Remark BATTERY,LITHIUMElectrecal section Capacitor LOCA.NO Description Specification Remark NP0 TS Coil Diode Fuse DigitronFilter Holder R121 0RD1800F608 R3G6 0RD1800F608 R553 0RD2200F608 R610 0RD2701F608 Switch LOCA.NO Description SpecificationRemote Controller Receiver Remark RESISTOR,DRAWING TAL TransformerVaristor Zener Diode