LG Electronics TL-AT130M Value Adjustment, Precise Adjustment Azimuth adjustment, 1KHZ 7KHZ

Page 54

DECK MECHANISM ADJUSTMENT

5-2. Confirm that the tape passes smoothly between the Take-up Guide and Pinch Roller(using a mirror or the naked eye).

1)After completing Step 5-1.(Preliminary Adjustment), check that the tape passes around the Take-up Guide and Pinch Roller without folding or curling at the top or bottom.

(1)If folding or curling is observed at the bottom of the Take-up Guide then slowly turn the Tilt Adjustment Screw(C) in the clockwise direction.

(2)If folding or curling is observed at the top of it then slowly turn the Tilt Adjustment Screw(C) in the counterclockwise direction.

NOTE:

Check the RF envelope after adjusting the A/C Head, if the RF waveform differs from Fig. C-5-4, performs Precise Adjustment to flat the RF waveform.

5-3. Precise Adjustment (Azimuth adjustment)

Test Equipment/ Fixture

Connection Point

Test Conditions

Adjustment Point

(Mechanism Condition)

 

 

 

 

• Oscilloscope

• Audio output jack

• Play an Alignment Tape

• Azimuth Adjustment Screw(A)

• Alignment Tape(SP)

 

1KHz, 7KHz Sections

• Height Adjustment Screw(B)

•Screw Driver(+) Type 5mm

Adjustment Procedure

1)Connect the probe of the oscilloscope to Audio Output Jack.

2)Alternately adjust the Azimuth Adjustment Screw(A) and the Tilt Adjustment Screw(C) for maximum output of the 1KHz and 7KHz segments, while maintaining the flattest envelope differential between the two frequencies.

1KHZ

 

7KHZ

 

 

 

A:Maximum

B:Maximum

Fig. C-5-4

6. X-Value Adjustment

Purpose: To obtain compatibility with the other VCR(VCP) Models.

Test Equipment/ Fixture

Connection Point

Test Conditions

 

Adjustment Point

(Mechanism Condition)

 

 

 

 

 

 

 

 

 

 

• Oscilloscope

• CH-1: PB RF Envelope

• Play an Alignment Tape

 

Groove at the

• Alignment Tape(SP only)

• CH-2: NTSC: SW 30Hz

 

 

 

Left

Base A/C

• Screw Driver(+) Type 5mm

PAL: SW 25Hz

 

 

 

 

 

• Head Switching Output

 

 

 

 

Test Point

 

 

Right

 

• RF Envelope Output Test

 

 

 

Point

 

 

 

 

 

 

 

 

Adjustment Procedure

Adjustment Diagram

 

1) Release the Automatic Tracking to run long enough for

X-Value Adjustment Hole

 

tracking to complete it’s cycle.

Fixed Screw

 

2) Loosen the Fixed Mounting Screw and move the Base

 

 

 

Assembly A/C Head in the direction as shown in the dia-

Azimuth Adjustment

Tilt Adjustment Screw(C)

gram to find the center of the peak that allows for the max-

Screw(A)

 

imum waveform envelope.

 

Height Adjustment Screw(B)

This method should allow the 31µm Head to be centrally

 

 

located over the 58µm tape track.

 

 

3) Tighten the Base Assembly A/C Head mounting Screw.

 

 

 

Connection Diagram

OSCILLOSCOPE

 

 

 

RF ENVELOPE OUTPUT TEST POINT

 

 

HEAD SWITCHING OUTPUT TEST POINT

CH-1 CH-2

 

 

4-17

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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 When the drum moter stop Video is unstable in PB modePB mode Servo CircuitWhen the capstan motor stops Capstan motor stopsNo 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 CircuitNo sound in REC Mode No sound in REC ModeSYSTEM/KEY Circuit Auto Stop No cassette tape loadingAuto Stop No OSD display No Key displayOSD Circuit 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-2-4Bracket 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-2-6Base Assembly A/C Head Arm AssemblyCleaner Head F/E Fig. A-3-2Arm 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-4-4Arm 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-6-3Lever Spring Fig. A-7-6 Gear Sector Fig. A-7-3Lever Tension Fig. A-7-5 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 Tension Fig. A-9-2 Base Loading Fig. A-9-1 Arm Assembly Idler Fig. A-9-3Arm Assembly Idler Base Tension Base LoadingDeck Mechanism Adjustment Mechanism Alignment Position Check Fig. C-1Mechanism Condition Checking TorqueTest Equipment/ Fixture Test Conditions Torque Gauge 600g.cm ATG Cassette Torque Meter SRK-VHT-303Guide Roller Height Adjustment Head Assembly Audio/Control A/C Head AdjustmentAdjustment Procedure/Diagrams Head BaseAdjustment Procedure Adjustment Diagram Value AdjustmentPrecise Adjustment Azimuth adjustment 1KHZ 7KHZAdjustment after Replacing Drum Assembly Video Heads Check the Tape Travel after Reassembling Deck AssemblyCheck before starting repairs Maintenance Procedure Required MaintenanceScheduled Maintenance CleaningGreasing 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 ScrewBuzzer LOCA.NO Description Specification Remark BATTERY,LITHIUMElectrecal section CapacitorLOCA.NO Description Specification Remark NP0 TS Coil DiodeFuse DigitronFilter HolderR121 0RD1800F608 R3G6 0RD1800F608 R553 0RD2200F608 R610 0RD2701F608 Switch LOCA.NO Description SpecificationRemote Controller Receiver Remark RESISTOR,DRAWINGTAL TransformerVaristor Zener Diode
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