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HITACHI HT-464
ADJUSTMENTS
1. Tracking force adjustment
(2) Remove
the sensor holder.
Bring the tone arm
(1)
Remove the stylus cover and disengage the
from the arm rest to the innermost part of the
rest hook.
platter.
(2}
Set the anti-skating knob to "0" and adjust
the tone
arm's
balance
using
the
balance
weight.
(3)
Secure the balance weight by hand, rotate
only the scale ring and set the ring's "0" to
the index line.
(4)
Rotate the balance weight gently and align
the index line with the number (2 g with this
unit) corresponding
to the designated track-
ing force of the cartridge used.
. Anti-skating adjustment
Align the number (2 g with this unit) corresponding
to the designated tracking force of the cartridge used
with the reference line.
. Stylus height adjustment (Fig. 8)
Place the record on the platterd and set the arm lifter
button to UP. Now remove the cap and adjust the
stylus
height
adjust
screw
with
an_
ordinary
screwdriver so that the distance from the record sur-
face to the stylus tip is between 6 and 9 mm.
. Stylus descent position adjustment
Use a 30 cm record or a HITACH test record (HT-5,
stock No. 2561081) for this adjustment.
(1) Remove the cap. (Refer to Fig. 9)
(2) Perform the auto-in operation and check the
stylus descent position.
Adjust
the
stylus
descent
position
adjust
screw
with an ordinary screwdriver.
When
this position is too far inside the record, rotate
the screw to the left, and when too far out-
side, rotate the screw to the right. Rotating
the screw through a half-turn causes the des-
cent position of the stylus to change about 1.5
mm,
Repeat (2) and (3), and adjust to the position
in Fig. 10. When adjusting with the HITACH
HT-5 test record (side A), adjust to about 15
counts at the 30 cm position. When
the de-
scent position of the stylus is adjusted on this
unit, the return position is simultaneously ad-
justed.
. Speed adjustment (Fig. 11)
When the stripes of the strobo appear to flow and are
resistors (R52, 53) in the following way.
. Return sensitivity adjustment (Fig. 11)
Adjust as follows when replacing the CdS01 and DO3
or when the return circuit is malfunctioning.
(3
s
Note: Take care not to damage the CdS surface
when removing the sensor holder.
(3) Place the sensor holder which has been removed
in a dark box (or a bag which does not admit any
light).
Connect a DC voltmeter with the @ side to the
R20 terminal of the control P.W.B.
and the ©
side to the R21 ground.
(5) Return
the tone arm
to the arm
rest position
again, secure it and then set the power switch to
ON.
(6) Rotate R20 slowly and adjust for a DC voltmeter
reading of between 2.1 V and 2.2 V.
(7) After adjustment, first secure the sensor holder
to the unit plate and mount
it, following the
removal procedure in reverse.
(Note: Insert the holder firmly.)
(8) Set the record size selector knob to 30 cm, allow
the stylus to trace the grooves for the auto-in ad-
justment on the HT-5 HITACHI test record (side
A), and adjust the descent position of the stylus
to the count 15 position.
(9) Allow
the stylus to trace the grooves
for the
return sensitivity check on the HT-5 record (side
B) and check that there is no return.
(10) Allow the stylus to trace the grooves
for the
return sensitivity check on the HT-5 record (side
A), and check the return at between count 5 and
9
: Adjustment of stylus tip position
(Overhang adjustment) (Fig. 12)
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