No sound in REC Mode | LG Electronics TL-AT130M manual

SECTION3 ELECTRICAL

ELECTRICAL TROUBLESHOOTING GUIDE

(3) No sound in REC Mode.

NO sound in REC Mode.

YES

Sound is not recorded.

YES

Is Playback O.K.?

YES

NO

Refer to "No sound in PB Mode,".

Is the Audio signal applied to the IC301 Pin 76?

YES

Does the Audio waveform appear

at the IC301 Pin 7?

YES

Is 5V applied to the FL401

Pin 2?

YES

NO

NO

NO

Check the path of Line Audio.

Is the “High” signal applied to the

IC301 Pin 10?

YES

Check the IC501 Pin 96

(Audio Mute “H”).

NO

Check the CLK/Date line and

replace the IC301

Is 3.0~4.5V applied to the Emitter					Check the line of the 5V
of the Q481?					Power Circuit.
				NO
YES				NO

Does the Erase signal
appear at the FL401 Pin 6?
				NO
YES




Is the Voltage level of the IC301					Replace the FL401 or the
Pin6 850mVp-p?					Q405.
				NO
				NO

Check the Audio R/P/E connector and Head.

3-10

Image 20

LG Electronics TL-AT130M service manual No sound in REC Mode

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 Video is unstable in PB mode PB modeWhen the drum moter stop Servo Circuit When the capstan motor stops Capstan motor stops C Circuit No Video in EE ModeNo Video in EE Mode 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 EE Mode No sound in PB Mode No sound in EE 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 No Key display OSD CircuitNo 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 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 Gear Assembly Rack F/L Fig. A-2-5 Holder Assembly CST Fig.A-2-2Bracket Assembly L/D Motor Fig. A-2-4 Arm Assembly F/L Fig. A-2-6 Arm Assembly CleanerBase Assembly A/C Head Head F/E Fig. A-3-2 Brake Assembly T Fig. A-4-1 Brake Assembly RS Fig. A-4-2Arm 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 Brake Assembly Capstan Lever F/R Fig. A-6-3 Gear Sector Fig. A-7-3 Lever Tension Fig. A-7-5Lever Spring Fig. A-7-6 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 Loading Fig. A-9-1 Arm Assembly Idler Fig. A-9-3 Arm Assembly IdlerBase Tension Fig. A-9-2 Base Tension Base Loading Deck Mechanism Adjustment Mechanism Alignment Position Check Fig. C-1 Checking Torque Test Equipment/ Fixture Test ConditionsMechanism Condition Torque Gauge 600g.cm ATG Cassette Torque Meter SRK-VHT-303 Guide Roller Height Adjustment Audio/Control A/C Head Adjustment Adjustment Procedure/DiagramsHead Assembly Head Base Value Adjustment Precise Adjustment Azimuth adjustmentAdjustment Procedure Adjustment Diagram 1KHZ 7KHZ Adjustment after Replacing Drum Assembly Video Heads Check the Tape Travel after Reassembling Deck Assembly Check before starting repairs Required Maintenance Scheduled 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 Nono Is the Belt ok? Front Loading Mechanism Cassette does not load Exploded Views Moving Mechanism A11 Parts Section NSP Not Service PartRUN Date Description Specification Assembly Section RemarksLOCA.NO Description Specification Remarks Screw LOCA.NO Description Specification Remark BATTERY,LITHIUM Electrecal sectionBuzzer Capacitor LOCA.NO Description Specification Remark NP0 TS Coil Diode Digitron FilterFuse Holder R121 0RD1800F608 R3G6 0RD1800F608 R553 0RD2200F608 R610 0RD2701F608 LOCA.NO Description Specification Remote Controller Receiver RemarkSwitch RESISTOR,DRAWING Transformer VaristorTAL Zener Diode