Technics RS-M215 - Measurement and Adjustment Methods; Head Position Adjustment; Head Azimuth Adjustment; L-ch;R-ch Output Balance Adjustment

RS-M215
N
D
ADJUSTMENT
M
ETHODS
NOTES:
Keep good
condition,
set
switches
and
controls
in
the
following
positions,
unless
otherwise
specified.
M
EASU
REM
ENT
A
@
Make
sure
heads
are
clean.
@
Tape
selector:
Normal
position
©
Make
sure
capstan
and
pressure
roller
are
clean.
®
Input
selector:
Line
in
ADJUSTMENT
PARTS
LOCATION
@
Judgeable
room
temperature:
20
+5°C
(68+9°F)
@
input
level
controls
:
Maximum
@
Dolby
NR
switch:
OUT
MEASUREMENT & ADJUSTMENT
Tape speed adjustment VR
Screw (A)
®
Head
position
(The
head
adjusting
plate
is
provided
to
adjust
the
tape
Head Adjusting Plate
adjustment touch of the head in cue or review mode.) Capstan ud
Condition:
1.
Press
the
playback
button
and
pause
button
—
a
*
Playback
and
pause
mode
2.
Measure
the
space
between
the
pressure
roller
and
the
Rs
capstan. (fe
Pressure Roller
Standard
value:
0.5+0.3mm
ve
Q
Space
(adjustable)
3.
If
the
measured
value
is
not
within
the
standard
value,
untighten
screw
(A),
and
slide
the
head
adjusting
plate
in
the
direction
of
arrow
(B)
for
adjustment
@
Head
azimuth
L-ch/R-ch
output
balance
adjustment
adjustment
1.
Make
connections
as
shown
in
fig.
4.
Condition:
* Playback mode
“VTVM. Os cilloscope
Playback mode
Small
hole
Equipment
2.
Playback
the
8kHz
signal
from
the
test
tape
(QZZCFM).
Fig.
4
*VTVM__
+
Oscilloscope
Adjust
screw
(B)
in
fig.
5
for
maximum
output
L-ch
and
Record/olavbadk
Please
use
non
metal
type
screwdriver
when
*
Test
tape
(azimuth)
R-ch
levels.
g
head
you
adjust
tape
speed
accuracy
on
this
unit.
»
QZZCFM
When
the
output
levels
of
L-ch
and
R-ch
are
not
at
maximum
at
the
same
time,
readjust
as
follows.
A
3.
Turn
the
screw
shown
in
fig.
5
to
find
angles
A
and
C
(points
where
peak
output
levels
for
left
and
right
channels
sue)
Fig.
1
are
obtained).
Then,
locate
the
angle
B
between
angles
A
Fig.
5
and
C,
i.e,
2
point
where
L-ch
and
R-ch
output
levels
come
Leh
peak
level
poh
peak
level
together
at
maximum.
(Refer
to
figs.
5
and
6.)
fi
-s <>
L-ch/R-ch phase adjustment
4. Make connections as shown in fig. 7.
5.
Playback
the
8kHz
signal
from
the
test
tape
(QZZCF™M).,
Adjust
screw
(B)
shown
in
fig.
5
so
that
pointers
of
the
two
VTVMs
swing
to
maximum
and
a
waveform
as
illustrated
in
Fig.
6
fig.
8
is
obtained
on
the
oscilloscope
>
wo exe
——_—>
ANGLE
Record/playback
Playback
mode TE
Fig. 7
Vertical Horizontal
Fig. 8
@
Tape
speed
Tape
speed
accuracy
Record/playback
head
LINE OUT 3
Condition:
1.
Test
equipment
connection
is
shown
in
fig.
9.
of)
*
Playback
mode
2.
Playback
test
tape
(QZZCWAT
3,000Hz),
and
supply
P|
_
=}
fo
i
Equipment: playback signal to frequency counter Test tape 'lavback mes Digital electronic counter
3.
Measure
this
frequency.
Fig.
9
* Digital electronic counter or
frequency
counter
4.
On
the
basis
of
3,000Hz,
determine
value
by
following
*
Test
tape
---
QZZCWAT
formula:
Tape
speed
accuracy
=
f -- 3,000
3,000
Take measurement at middie section of tape
VR1 R202
VR2 VR201 hic
x 100(%) where, f = measured value
Refer
to
@
Fluorescent
meter
at
page
6.
Standard value: +1.5%
Fig. 2
Adjustment method
1. Playback the test tape (middle).
2.
Adjust
so
that
frequency
becomes
3,000
Hz.
3.
Tape
speed
adjustment
VR
shown
in
fig.
1.