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LG Electronics TL-AT130M 5. Audio/Control (A/C) Head Adjustment

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DECK MECHANISM ADJUSTMENT

5. Audio/Control (A/C) Head Adjustment

10.9

Purpose: To insure that the tape passes accurately over the Audio and Control Tracks in

exact alignment of the both Record and Playback Modes.

Test Equipment/ Fixture

• Blank Tape

• Screw Driver(+) Type 5mm • Play the blank tape

Test Conditions (Mechanism Condition)

Adjustment Point

• Tilt Adjustment Screw(C)

• Height Adjustment Screw(B)

• Azimuth Adjustment Screw(A)

Fig. C-5-1

A/C Head Base

Fig. C-5-2

Height Adjustment

Screw(B)

Tilt Adjustment

Screw(C)

Azimuth Adjustment

Screw(A)

X-Value Adjustment

Hole

Fixed Screw

Fig. C-5-3

A/C Head Tape

Tape

0.2~0.25mm

P4

5-1. Preliminary Adjustment (Height and Tilt Adjustment)

Perform the Preliminary Adjustment, when there is no Audio Output Signal with the Alignment Tape.

1) Initially adjust the Base Assembly A/C Head as shown

Fig. C-5-1 by using the Height Adjustment Screw(B).

2) Play a blank tape and observe if the tape passes accu-

rately over the A/C Head without tape curling or folding.

3) If folding or curling is occured then adjust the Tilt

Adjustment Screw(C) while the tape is running to resem-

ble Fig. C-5-3.

4) Reconfirm the tape path after Playback about 4~5 sec-

onds.

NOTE

Ideal A/C head height occurs when the tape runs between

0.2~0.25mm above the bottom edge of the A/C Head core.

Adjustment Procedure/Diagrams

A/C Head Assembly

Contents

Main 2 CAUTION BEFORE SERVICING THE UNIT, READ THE SAFETY PRECAUTIONS IN THIS MANUAL. TIME LAPSE VCR SERVICE MANUAL APRIL, 2006 Printed in Korea TABLE OF CONTENTS SECTION 1 SUMMARY SECTION 2 CABINET & MAIN FRAME SPECIFICATIONS FRONT REAR INDICATOR PANEL VCR FUNCTION INDICATION TERMINAL SIGNAL LEVELS CRITICAL PARTS REPLACING TIME TABLE CRITICAL PARTS DESCRIPTION SECTION2 CABINET & MAIN FRAME EXPLODED VIEWS 1. Cabinet and Main Frame Section Cabinet & Main Frame Section Parts list Page 2. Packing & Accessory Section NOTE SECTION2 CABINET & MAIN FRAME EXPLODED VIEWS Packing Accessory Section Parts list ELECTRICAL ADJUSTMENT PROCEDURES 3-2 1. Power Circuit(SMPS) (1) No 5.3 A (2) No 9V No 5.3V No 12V (3) No 24 V 3-3 (4) No 5.2 A (TO AVCP, BIAS) (5) No 10V No 5.2V No 10V 3-4 2. SERVO CIRCUIT (1) Video is unstable in PB mode In PB mode (2) Drum motor stops When the drum moter stop (3) Capstan motor stops 3-5 When the capstan motor stops 3-6 3. Y/C CIRCUIT (1) No Video in EE Mode No Video in EE Mode (2) When the Y(Luminance)signal doesnt appear on the screen in PB Mode. 3-7 Is 5V applied to the IC301 Pin 16, 40, 55, 58, 87? Replace the IC301. 3-8 (3) When the C(Color) signal doesn't appear on the screen in PB Mode Is 5V applied to the IC301 Pin 16, 40, 55, 58, 87? Does the Color signal appear at the IC301 Pin 71? (4) When the Video signal doesn't appear on the screen in REC Mode. Is the EE signal normal? 4. AUDIO CIRCUIT (1) No sound in EE Mode No sound in EE Mode. No sound. Replace the IC301 (2) No sound in PB MODE No sound in PB Mode. No sound. (3) No sound in REC Mode. NO sound in REC Mode. Sound is not recorded. Check the line of the 5V Power Circuit. Replace the FL401 or the Q405. 3-11 5. SYSTEM/KEY CIRCUIT (1) AUTO STOP *Caution : Auto stop can occur because Grease or Oil is dried up Auto Stop (2) No cassette tape loading No cassette tape loading Is there REG. 12V at PMCQ1 Pin8? (2) No F.OSD display. 3-12 (3) No Key display No F.OSD display. No OSD display. Page Page Page Page Page Page Page Page Page Page Page Page Page Page DECK MECHANISM PARTS LOCATIONS DECK MECHANISM DISASSEMBLY DECK MECHANISM ADJUSTMENT MAINTENANCE/INSPECTION PROCEDURE SECTION 4 MECHANISM CONTENTS DECK MECHANISM PARTS LOCATIONS 4-1 Top View T:Top, B:Bottom Part Fixing Type 1. Drum Assembly (Fig. A-1-1) 1-1. Drum Motor Fig. A-1 (Fig. B-1) Fig. A-2 4-4 2. Plate Top (Fig. A-2-1) 3. Holder Assembly CST (Fig.A-2-2) 4. Opener Door (Figure. A-2-3) 5. Bracket Assembly L/D Motor (Fig. A-2-4) 6. Gear Assembly Rack F/L (Fig. A-2-5) 9. Arm Assembly Cleaner (Fig. A-3-1) 10. Head F/E (Fig. A-3-2) 11. Base Assembly A/C Head (Fig. A-3-3) Fig. A-3 (Fig. A-3-1) Fig. A-4 12. Brake Assembly T (Fig. A-4-1) 13. Brake Assembly RS (Fig. A-4-2) 14. Arm Assembly Tension (Fig. A-4-3) 15. Reel S / Reel T (Fig. A-4-4) 4-7 Fig. A-5 16. Base Assembly P4 (Fig. A-5-1) 17. Opener Lid (Fig. A-5-2) 18. Arm Assembly Pinch (Fig. A-5-3) 19. Lever T/up (Fig. A-5-4)/ Arm T/up (Fig. A-5-5) (Fig. A-5-2) Page 4-9 Fig. A-7 24. Gear Drive (Fig. A-7-1)/ Gear Cam (Fig. A-7-2) 25. Gear Sector (Fig. A-7-3) 26. Plate Slider (Fig. A-7-4) 27. Lever Tension (Fig. A-7-5) 28. Lever Spring (Fig. A-7-6) Fig. A-8 29. Gear Assembly P2 (Fig. A-8-1)/ Gear Assembly P3 (Fig. A-8-2) 30. Base Assembly P2 (Fig. A-8-3)/ Base Assembly P3 (Fig. A-8-4) (Fig. A-8-2) Fig. A-9 31. Base Loading (Fig. A-9-1) 32. Base Tension (Fig. A-9-2) 33. Arm Assembly Idler (Fig. A-9-3) Tools and Fixfures for Service Purpose:To determine if the Mechanism is in the correct position, when a Tape is ejected. 1. Mechanism Alignment Position Check 4-14 Cassette Torque Meter (SRK-VHT-303) Torque Gauge (600g.cm ATG) 3. Checking Torque Test Equipment/ Fixture Checking Method Fig. C-3-2Fig. C-3-1 Test Conditions (Mechanism Condition) 4.Guide Roller Height Adjustment 5. Audio/Control (A/C) Head Adjustment 4-17 Purpose: To obtain compatibility with the other VCR(VCP) Models. Connection Diagram Fig. C-5-4 6. X-Value Adjustment Adjustment Procedure 5-3. Precise Adjustment (Azimuth adjustment) Adjustment Procedure Adjustment Diagram 7. Adjustment after Replacing Drum Assembly (Video Heads) Checking/Adjustment Procedure Connection Diagram Waveform Fig. C-7 8. Check the Tape Travel after Reassembling Deck Assembly. 1. Check before starting repairs Fig. C-9-3 Tape Transport System Fig. C-9-2 Bottom View * No. (1)~(12) Indicates the Tape Path to be traveled from Supply Reel to Take-up Reel. Fig. C-9-1 Top View 2. Required Maintenance 3. Scheduled Maintenance 4. Supplies Required for Inspection and Maintence 5. Maintenance Procedure 5-1) Cleaning 4-21 5-2) Greasing NOTE:Greasing Points Page Page Page Page Page Page 1. Front Loading Mechanism Section 2. Moving Mechanism Section(1) OPTIONAL PART 4-29 A01 A03 3. Moving Mechanism Section(2) OPTIONAL PART 4-30 A11 A12 SECTION 5. REPLACEMENT PARTS LIST NSP : Not Service Part MECHANICAL SECTIONRUN DATE : 2004.05.01 - 5-2 - Packing & Accessory Section Cabinet & Main Frame Section - 5-3 - Electrecal section - 5-4 - - 5-5 - - 5-6 - - 5-7 - - 5-8 - - 5-9 - - 5-10 - - 5-11 - - 5-12 - - 5-13 -