Technics RS-M226 - Head Position Adjustment

RS-M226
ITEM MEASUREMENT & ADJUSTMENT
@
Head
position
(The
head
adjusting
plate
is
provided
to
adjust
the
tape
Screw
(A)
adjustment
touch
of
the
head
in
cue
or
review
mode)
Capstan
Condition 1 Press the playback button and pause button
* Playback and pause mode 2. Measure the space between the pressure roiler and the (B)
capstan
Head Adjusting Plate
Pressure Roller
Standard value: 0.5+0.3mm
Space (adjustabte)
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 Fig. 2
@ Head azimuth L-ch/R-ch output balance adjustment LINE QUT
adjustment 1. Make connections as shown in fig. 3. merpeu/ paynael
Condition
+ Playback mode : _ os sill
: Playback the 8kHz signal from the test tape (QZZCFM) Playback mode VIVM Oscilloscope
Equipment
:
abe
;
;
i
Ve
2
Oaslotone
ene
(B)
in
fig.
4
for
maximum
output
L-ch
and
Fig.
3
* Test
tape
(azimuth)
When
the
output
levels
of
L-ch
and
R-ch
are
not
at
c
pees
Mint
~
Q2ZCFM
maximum
at
the
same
time,
readjust
as
follows
Turn
the
screw
shown
in
fig.
4
to
find
angles
A
and
C
(points
where
peak
output
levels
for
left
and
right
channels
are
obtained).
Then,
locate
the
angle
B
between
angles
A
Screw
(B)
Fig.
4
and
C,
i.e.,
a
point
where
L-ch
and
R-ch
output
levels
come
together
at
maximum.
(Refer
to
figs.
4
and
5.)
ee
Roh
peak
level
L-ch/R-ch phase adjustment
4 Make connections as shown in fig. 6.
5. Playback the 8kHz signal from the test tape (QZZCFM)
Adjust screw (B) shown in fig. 4 so that pointers of the two
VTVMs swing to maximum and a waveform as illustrated in
fig. 7 is obtained on the oscilloscope
Oscill
VIVM| illoscope
Playback {ine :
mode Qyt Vertical Horizontal Fig. 6
@
Tape
speed
Tape
speed
accuracy
Record/playback
head
Condition
1
Test
equipment
connection
1s
shown
in
fig.
8.
eae
*
Playback
mode
2.
Playback
test
tape
(QZZCWAT
3,000Hz2)
at
middle
section
eo]
and
supply
playback
signal
to
frequency
counter.
Test
tape
Payback
mode
Digital
electronic
counter
3
Measure
this
frequency
Fig.
8
4.
On
the
basis
of
3.000Hz.
determine
value
by
following
formula
LINE OUT
Equipment
* Digital electronic counter or
frequency counter
* Test tape --- QZZCWAT t -- 3.000
Tape speed accuracy = 3000 x 100(%) where. f -. measured value
f
| Standard value: +1.5%
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.
Tape speed fluctuation
Make measurements in same manner as above (beginning, middle and end of tape), and determine the
difference between maximum and minimum values and calculate as follows
: f:—fe
Tape speed fluctuation = 3 00. 100 (%) f: = maximum value, f» = minimum value
Standard value: Less than 1%
Note:
Please use non metal type screwdriver when you adjust tape speed accuracy on this unit.