Audio/Control (A/C) Head Adjustment; Preliminary Adjustment - LG LGXBR342 Service Manual

DECK MECHANISM ADJUSTMENT

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

Purpose: To insure that the Tape's Audio and Control Tracks pass accurately over the
head in exact alignment in both the Record and Playback Modes.
5-1. Preliminary Adjustment (Height and Tilt Adjustment)
Perform the Preliminary Adjustment, when there is no Audio Output Signal with the Alignment Tape.
Test Equipment/ Fixture
• Blank Tape
• Screw Driver (+) Type 5mm
Adjustment Procedure/Diagrams
1) Adjust the A/C Head Base Assembly 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 the Tape Curling or
Folding.
3) If Folding or Curling occurs adjust the Tilt Adjustment
Screw (C) while the Tape is running to resemble Fig. C-
5-3.
Fig. C-5-1
X-Value Adjustment
Hole
Fixed Screw
Azimuth Adjustment
Screw (A)
A/C Head Assembly
Fig. C-5-2
Test Conditions (Mechanism Condition)
• Play the blank tape
A/C Head Base
Tilt Adjustment
Screw (C)
Height Adjustment
Screw (B)
• Tilt Adjustment Screw (C)
• Height Adjustment Screw (B)
• Azimuth Adjustment Screw (A)
4) Reconfirm the Tape Path after playback of approximate-
ly 4~5 seconds.
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.
A/C Head
4-16
Adjustment Point
Tape
P4
Tape
0.2~0.25mm
Fig. C-5-3