Sony WM-23 - Section 2: Adjustments and Measurement; Mechanical Adjustments and Measurement; Precautions for Adjustment; Torque Measurement

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SECTION 2
7 7 ADJUSTMENTS
2-1. MECHANICAL ADJUSTMENTS AND |
MEASUREMENT
-WM-11D/23. WM-11D/23_
2-2. ELECTRICAL ADJUSTMENTS
Playback Head Azimuth Adjustment Tape Speed Adjustment
PRECAUTION power supply voltage :3Vdc
7
SPEED
CONTROL
knob
:
center
click
Procedure:
|
Procedure:
Clean
the
following
parts
with
a
denatured-
|
1.
Mode:
playback
alcohol-moistened
swab:
Torque
Measurement
Mode: playback
| speed checker
LFM-30
rubber belts
>) ae VTVM digital frequency
‘ ef gecm z 6.3 kHz, -10dB test tape . counter
ren
aoe
0.3-0.72oz~inen)
|
SON
|
WS-48A
|
Demagnetize
the
playback
head
with
a
head
Fast
Forward
50
—75g°cm
(3
kHz,
OdB)
CQ-201B
demagnetizer.
|
and
Rewind
(0.69
—
1.0
ozeinch)
,
|
1.5
—4.5
g¢cm
re
not
use
a
magnetized
screwdriver
for
the
ae
ener
CQ-102B
en
SEAMS
adjustments.
,
,
|
HEADPHONES
After
the
adjustments,
apply
suitable
locking
|
:
iis
i
2.
Turn
the
adjustment
screw
for
the
maximum
compound
to
the
parts
adjusted.
Tape
Tension
Measurement
|
J
|
output
levels.
If
these
levels
do
not
match,
turn
The
adjustments
should
be
performed
with
the
|
Meter
|
Meter
Reading
the
adjustment
screw
where
both
of
output
rated
power
supply
voltage
unless
otherwise
CQ-403
More
than
110g
(3.88
0z)
noted.
Specification:
levels match together within 1 dB.
Speed checker Digital frequency counter —
L-CH Frequency difference between the beginning
peak and the end of the tape should be within 1%
Head Height Adjustment (30 Hz).
1.
Prepare
an
adjustment
cassette
as
shown
below.
Rees
Location:
R-CH
Screw peak RV601
position adjustable resistor
L-CH R-CH |
peak peak
>
3. Phase Check
Mode: playback
C-90
test
tape
tape
cassette
Cut
out
hatched
P-4-A063
|
oscilloscope
portions.
(6.3 kHz,
-10 dB)
—
L-CH
322
2. In record mode and viewing from the front,
adjust the head heights to eliminate tape curl
and tape twist at arrowed portions.
HEADPHONES Adjustment Location:
| Screen pattern
in phase 45° 90° 135° 180°
—__—_y————_ 7
good wrong
Sees heey 4. After the adjustment, lock the screws with Head Azimuth adjustment screw
Shim, head height adjustment locking compound.