LG Electronics TL-AT130M service manual Check before starting repairs

Page 56

MAINTENANCE/INSPECTION PROCEDURE

1. Check before starting repairs

The following faults can be remedied by cleaning and oil- ing. Check the needed lubrication and the conditions of cleanliness in the unit.

Check with the customer to find out how often the unit is used, and then determine that the unit is ready for inspec- tion and maintenance. Check the following parts.

Phenomenon

Inspection

Replace-

ment

 

 

 

 

 

 

 

 

Color beats

Dirt on Full-Erase Head

o

 

 

 

 

 

 

Poor S/N, no color

Dirt on Video Head

o

 

 

 

 

 

 

Vertical or

Dirt on Video Head

o

Horizontal jitter

Dirt on tape transport system

 

 

 

 

 

 

 

Low volume,

Dirt on Audio/Control Head

o

Sound distorted

 

 

 

 

 

 

 

 

Tape does not run.

Dirt on Pinch Roller

o

Tape is slack

 

 

 

 

 

 

 

 

In Review and

Clutch Assembly D35

o

Unloading (off mode),

torque reduced

 

the tape is rolled up

 

 

 

 

loosely.

Cleaning Drum and

Fig. C-9-3

 

transport system

 

 

 

 

 

NOTE

If locations marked with o do not operate normally after cleaning, check for wear and replace.

See the EXPLODED VIEWS at the end of this manual as well as the above illustrations and see the Greasing (Page 4-21, 22) for the sections to be lubricated and greased.

F/E Head

Video Head

Fig. C-9-1 Top View

A/C Head

Pinch Roller

Belt Capston

Clutch

Assembly D35

Fig. C-9-2 Bottom View

* No. (1)~(12) Indicates the Tape Path to be traveled from Supply Reel to Take-up Reel.

(3) F/E Head

(6) Base Assembly P3

 

(7) A/C Head

(5) Drum Assembly

(8) P4 Post

(10) Pinch Roller

(Video Head)

 

(4) Base

(11) Take-up Guide Post

 

Assembly P2

 

(2) Tension Post

(9) Capstan Shaft

(1) Supply Reel

 

 

(12) Take-up Reel

Fig. C-9-3 Tape Transport System

4-19

Page 55 Page 57
Image 56
Page 55 Page 57
Contents KEY Table of Contents Summary Front RearIndicator Panel VCR Function IndicationTerminal Signal Levels IN/OUT DescriptionSummary Critical Parts Replacing Time Table Cabinet & Main Frame Exploded Views Cabinet & Main Frame Section Parts list Cabinet and Main Frame SectionPacking Accessory Section Parts list Packing & Accessory SectionPG Adjustment Connection chart of PG adjustmentPower CircuitSMPS No 5.3 a No 24No 5.2 a to AVCP, Bias Video is unstable in PB mode PB modeWhen the drum moter stop Servo CircuitWhen the capstan motor stops Capstan motor stopsC 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 CircuitNo sound in REC Mode No sound in REC ModeAuto Stop SYSTEM/KEY Circuit Auto StopNo cassette tape loading No Key display OSD CircuitNo OSD display No F.OSD displayElectrical 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.BOARDMechanism Top View Bottom View Part Fixing TypeDrum Assembly Fig. A-1-1 Drum MotorPlate Top Fig. A-2-1 Fig. A-2-4Gear 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-2-6Arm Assembly CleanerBase Assembly A/C Head Head F/E Fig. A-3-2Brake 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-4-4Lever 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-6-3Gear Sector Fig. A-7-3 Lever Tension Fig. A-7-5Lever Spring Fig. A-7-6 Just lift the Plate Slider upGear 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-8-4Base Loading Fig. A-9-1 Arm Assembly Idler Fig. A-9-3 Arm Assembly IdlerBase Tension Fig. A-9-2 Base Tension Base LoadingDeck Mechanism Adjustment Mechanism Alignment Position Check Fig. C-1Checking Torque Test Equipment/ Fixture Test ConditionsMechanism Condition Torque Gauge 600g.cm ATG Cassette Torque Meter SRK-VHT-303Guide Roller Height Adjustment Audio/Control A/C Head Adjustment Adjustment Procedure/Diagrams Head Assembly Head BaseValue Adjustment Precise Adjustment Azimuth adjustmentAdjustment Procedure Adjustment Diagram 1KHZ 7KHZAdjustment after Replacing Drum Assembly Video Heads Check the Tape Travel after Reassembling Deck AssemblyCheck before starting repairs Required Maintenance Scheduled MaintenanceMaintenance Procedure CleaningGear 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 ScrewLOCA.NO Description Specification Remark BATTERY,LITHIUM Electrecal sectionBuzzer CapacitorLOCA.NO Description Specification Remark NP0 TS Coil DiodeDigitron FilterFuse HolderR121 0RD1800F608 R3G6 0RD1800F608 R553 0RD2200F608 R610 0RD2701F608 LOCA.NO Description Specification Remote Controller Receiver RemarkSwitch RESISTOR,DRAWINGTransformer VaristorTAL Zener Diode
Top Page Image Contents