Pin 16, 40, 55, 58, 87? | LG Electronics TL-AT130M specification

SECTION3 ELECTRICAL

ELECTRICAL TROUBLESHOOTING GUIDE

(2) When the Y(Luminance)signal doesn’t appear on the screen in PB Mode.

Is 5V applied to the IC301

Pin 16, 40, 55, 58, 87?

Is the I2C Bus signal applied

to the IC301 Pin 23, 24?

YES

NO

NO

Check the line of the 5.3VA

Line. (Power Circuit)

Check the System Circuit. (Refer to

‘SYSTEM I2C BUS Trouble Shooting’)

Does the normal RF signal	NO
Does the normal RF signal
appear at the IC301 Pin74?
appear at the IC301 Pin74?

YES

Is the V.H.S/W "H" about 3.4V to the IC301 Pin11 ?

YES

Is V.H.S/W "H" about 3.4V at the IC301 Pin 11?

YES

Clean the Drum.

NO

NO

NO

Check the System Circuit.

(IC501 Pin 23)

Check the V.H.S/W level. (Check R304, R305)

Replace the IC301.

Does the Y(Luminance) RF signal	NO
appear at the IC301 Pin 17?
appear at the IC301 Pin 17?

YES

NO

Is the Y(Luminance) Video waveform

showed up at the IC301 Pin 41?


Check the path of the Y(Luminance)	YES
RF signal.(Check the Q301)
RF signal.(Check the Q301)


Check the path of the Y(Luminance)	YES
RF signal.(Check Q302, Q303)
RF signal.(Check Q302, Q303)

YES

Replace the IC301.

3-7

Image 17

LG Electronics TL-AT130M service manual Pin 16, 40, 55, 58, 87?, Clean the Drum Check the System Circuit IC501 Pin

Contents

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