No 5.2 a to AVCP, Bias | LG Electronics TL-AT130M specs

SECTION3 ELECTRICAL

ELECTRICAL TROUBLESHOOTING GUIDE

(4) No 5.2 A (TO AVCP, BIAS)

(5) No 10V

No 5.2V

Is D106 normal?

YES

Is Q153 normal?

YES

NO

NO

Replace D106.

Replace Q153.

No 10V

NO

Is D109 normal?

YES

Is Q170 normal?, Is there about			NO
13.5V at Q107 Base?
13.5V at Q107 Base?

YES

Replace D109

Check/ Replace

Q107, ZD103

Is there voltage (about 0V)	NO
at Q157 collector.
at Q157 collector.

YES

Check/

Replace Q156

Replace Q157.

Check/ Replace

D155, D156, D157/\.

3-3

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LG Electronics TL-AT130M service manual No 5.2 a to AVCP, Bias

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 No Video in EE Mode No Video in EE ModeC Circuit 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 No cassette tape loading SYSTEM/KEY Circuit Auto StopAuto Stop 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 Opener Lid Fig. A-5-2 Arm Assembly Pinch Fig. A-5-3Lever T/up Fig. A-5-4 Arm T/up Fig. A-5-5 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 Chassis Bottom Chassis Top GreasingGear Sector Gear Cam Base Loading Gear Drive Gear AY, P2 & P3 Lever, F/R, Base, TensionBase, Tension 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 RUN Date NSP Not Service PartParts Section 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