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4-3-4. AUDIO R/P HEAD (ACE HEAD)
HEIGHT ADJUSTMENT,
AZIMUTH ADJUSTMENT AND
HORIZONTAL POSITION ADJUSTMENT
(1) Hight/azimuth adjustment (See Fig.4-3-5)
1) Refer to section 4-3-3, complete the GUIDE ROLLER
adjustment, and perform the AUDIO R/P HEAD ad-
justment.
As the audio R/P head assembly (ACE HEAD) has
been temporarily adjusted before shipment, do not
rotate screws unnecessarily.
2) Mark screw
, screw
proof marker so that their original positions can be
known even after the screws are rotated.
Marking screws
and
enable the adjustment mentioned later to be per-
formed easily.
3) Play the alignment tape (NTSC:VHJ-0005, PAL:VHJ-
0008), and observe the audio output waveform using
an oscilloscope.
Loosen screw
in the counterclockwise direction to
decrease the audio output level. Then tighten it in the
clockwise direction until the maximum level. Tighten
further in the clockwise direction to decrease the
level, and loosen in the counterclockwise direction
until the maximum level.
4) Rotate screw
in the same direction by the same
degree as screw
in step 1. (Check visually accord-
ing to the mark made.)
5) Play the alignment tape (NTSC:VHJ-0006, PAL:VHJ-
0009), rotate screw
waveform (temporary azimuth adjustment).
6) Perform the adjustments in 3) to 5) again.
7) Perform fine adjustments using screw
Perform the same adjustments as 3), and if screw
was adjusted by more than 30 degrees, perform the
adjustment in step 4) again, and then perform fine
adjustments.
8) Play the alignment tape (NTSC:VHJ-0006, PAL:VHJ-
0009), rotate screw
waveform (actual azimuth adjustment).
Marking
, and bracket with a water-
in the same direction will
, and maximize the audio output
.
, and maximize the audio output
Audio R/P head
assembly (ACE head)
Fig.4-3-5
(2) Horizontal position adjustment (See Fig.4-3-6)
1) Play the alignment tape (NTSC: VHJ-0006, PAL: VHJ-
0009).
2) Press the tracking buttons (tracking + and tracking –
) simultaneously and set the tracking to the centre.
3) Using an oscilloscope, observe the waveform of the
video head output.
4) Loosen the two fixed screws on the audio R/P head
(ACE head) by between 20˚ and 30˚ anticlockwise.
5) Using a slotted screwdriver, adjust the position of
the audio R/P head (ACE head). At the position where
the amplitude of the envelope waveform is at its
maximum at the tracking centre, tighten the fixed
screw on the audio R/P head (ACE head). When you
do this, check that the envelope waveform changes
equally whether the tracking is shifted by pressing
the tracking button in the plus or the minus direction.
6) Play the alignment tape (NTSC: VSJ-1001 PAL: VHJ-
0052) and check that the amplitude of the envelope
waveform is at its maximum at the tracking centre. If
not, repeat steps 1) to 6).
7) Refer to the electrical adjustments section of the
service manual, and adjust the switching position of
the servo circuit.
NOTE
:
1. When you press the tracking buttons (tracking + and
tracking – ) simultaneously, the tracking is reset to the
tracking centre. When the tracking is at the tracking
centre, the message "TR - : - " will appear in place of the
clock display on the front panel. If you keep pressing
the tracking – button the messages "TR -: " and "TR - -: "
will appear, while if you keep pressing the tracking +
button, the messages "TR : -" and "TR : - - " will appear.
2. STEP 6) applies only the model with the model for REAL
TIME and the EP (LP) PLAYBACK function.
After resetting the tracking to
the tracking centre, set the en-
velope waveform to maximum.
Screw
–30–
Slotted
screwdriver
Screw
Audio R/ P head assembly
Fig.4-3-6
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