Toshiba SD-33VB, Service Manual

Page: 107 / 197

4-16
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 ) 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