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  9. Technics RS-M226 User manual

Technics RS-M226 User manual

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ORDER
NO.
ARD82060161C8-11
Service
Manual
Cassette
Deck
Soft-Touch
Cassette
RS-M226
Deck
with
Dolby
B-C
NR
(ee
Sied
Silver
Face
This
is
the
Service
Manual
for
the
}
|
following
areas.
a)
oe
For
all
European
areas
|
except
United
Kingdom.
|B)
eee
For
United
Kingdom.
|
DC
[porev
8-c
nm
Please
use
this
service
manual
for
the
RS-M226.
(Discard
the
service
manual
prepared
for
the
order
No.
ARD82050142C8-11.)
RS-M24
MECHANISM
SERIES
Specifications
Track
system:
4-track
2-channel
stereo
recording
and
playback
Inputs:
MIC;
sensitivity
0.25
mV,
applicable
microphone
r.
a
ety
impedance
4002—10kQ—
gee
SReees
Ones
LINE;
sensitivity
60
mV,
input
impedance
more
Wow
and
flutter:
0.048%
(WRMS),
+0.14%
(DIN)
er
.
ce
ae
eee
:
ut
lev
m
impedan
Frequency
response:
Metal
tape;
20—18,000Hz
ae
less
ia
23
ko
Dia
ee
aos
30—
17,000
Hz
(DIN)
HEADPHONES;
output
level
80mV
(82)
CrOz
tape;
20—18,000Hz
applicable
headphone
impedance
8
2—600
Q
30—
16,000
Hz
(DIN)
Bias
frequency
:
80
kHz
Normal
tape;
20
17,000Hz
Motor:
Electrical
DC
governor
motor
30
—
15,000Hz
(DIN)
Heads:
2-head
system
1
MX
head
for
rec/playback
Signal-to-noise
ratio:
Dolby
C
NR
in;
75dB
(CCIR)
1
double-gap
ferrite
head
for
erasure
Dolby
B
NR
in;
67 dB
(CCIR)
Power
requirements:
[DB]
---
AC
220
V,
50-60
Hz
NR
out:
57dB
(for
all
European
areas
except
United
Kingdom.)
(signal
level=max.
input
level
A
weighted,
CrO
eee
gnal
level
=max.
input
level
A
weighted,
CrO2
;
(only
for
United
Kingdom.)
type
tape)
Power
consumption:
12W
Fast
forward
and
Dimensions:
43.0
cm(W)
x
10.9cm(H)
X
23.3
cm(D)
rewind
time:
Approx.
90
seconds
with
C-60
cassette
tape
Weight:
4
Okg
Specifications
are
subject
to
change
without
notice.
*
‘Dolby’
and
the
double-D
symbol
are
trademarks
of
Dolby
Laboratories.
Technics
Matsushita
Electric
Trading
Co.,
Ltd.
P.O.
Box
288,
Central
Osaka
Japan
RS-M226
CONTENTS
ITEM
PAGE
ITEM
PAGE
LOCATION
OF
CONTROLS
BLOCK
DIAGRAM
cercccrcereecerceeetecereeeeeeneaeeetenans
9
AND
COMPONENTS
-oeeccccceeeeteeteeteseeeeseeeeeees
2
SCHEMATIC
DIAGRAM
-rcccceeeereeccectcececeeeeeeeess
13
DISASSEMBLY
INSTRUCTIONS
3
-+-trr-srsrse
sere
2
CIRCUIT
BOARDS
AND
MEASURMENT
AND
WIRING
CONNECTION
DIAGRAM
-+++++ee-++0+
15
ADJUSTMENT
METHODS
---eeccceerreeeteteet
teres
3
MECHANICAL
PARTS
LOCATION
-orrrereeeceertee:
18
ELECTRICAL
PARTS
LOCATION
crveersrcteeeteete
8
CABINET
PARTS
LOCATION
-orerreecccterrreeteenteees
22
LOCATION
OF
CONTROLS
AND
COMPONENTS
7
Headphones
Jack
(phones)
Tape
Counter
(tape
counter)
Power
Switch
[power
(push
on)]
Recording
Indicator
(rec)
Eject
Button
(eject)
Input
Select
Button
{input
select
(Mlinee
=
mic)|
Cassette
Holder
FL
(fluorescent
level)
Meter
|
XX
___|
@
Input
Level
Controis
[input
level(L
->
R)]
Gar
Selector
{tape
select
(NormaleCrOzeMetal)|
Fast
Forward/Cue
Button
(ff/cue
(PP
)])
Dolby
Noise
Reduction
Select
Counter
Reset
Button
Switch
[Dolby
NR
(2
Be
=
@)]
{counter
reset)
Rewind/
Review
Button
[rew/rev
(
44
)]
Microphone
Jacks
[mic
(lefteright)]
Dolby
Noise
Reduction
Switch
(Dolby
NR
(2
oute™
in)}
en
ene
enn
&
7—
AC
Power
Voitage
Select
Switch
=
ae
SE
5
|
Play
Button
Record
Button
—
fl
|
(play-
2(>)]
iree-&
(O)]
(cae
“P|
——-
{
eo
4-4
|
i
Stop
Button
Pause
Button
[stop
(m)]
(pause
(11)]
L
Line
Output
Jacks
[LINE
OUT
(LeR)]
——
Line
Input
Jacks
[LINE
IN
(L@R)]
DISASSEMBLY
INSTRUCTIONS
*
The
head
azimuth
can
be
adjusted
by
removing
the
cassette
lid.
|
Fig.
1
Power
supply
(D)
circuit
Flat
Record/
playback
connection
wire
iRecord/playback
=p
‘connection
ss
\
iwire
A
circuit
(F
board
Fig.
5
—2—
RS-M226
Procedure
To
remove
——
.
;
Shown
in
fig.
——
.
1
Case
cover
*
2
screws
1
+
3
screws
(Slide
in
direction
of
arrow)
Bottom
cover
+
Pull
out
the
flat
cable
from
connector
Power
supply
circuit
*
2
Screws
board
*
Cord
clamper
+
Pull
out
the
switch
rod-C
+
2
red
screws
Front
panel
FPR]
WM]
WWWWWw
FL.
meter
unit
+
Meter
cover
and
meter
filter
+
Pull
out
the
FL
meter
unit
+
3
red
screws
*
Pull
out
the
switch
rod-E
+
Pull
out
the
flat
cable
from
connector
[4]
*
Pull
out
the
socket
+
As
shown
in
fig.
3,
push
the
claw
in
the
direction
of
arrow
(®,
{lift
the
main
circuit
board
in
the
direction
of
arrow
@.
+
Remove
the
record/playback
connection
wire
in
the
direction
of
arrow
@)
while
lifting
the
main
circuit
board
in
the
direction
of
arrow
@
as
shown
in
fig.
3.
17
2-4>5->6
Main
circuit
board
+
Cassette
lid
1324-57
Mechanism
unit
*
4
red
screws
»*
Pull
out
the
counter
reset
lever
17
2-45-78
Cassette
holder
Se
gee”
OSA
A
ATPRILOHY:
So
°
«ie
(TPO
(TPO
|
geelrpatecny
TRB
/TP7\
\
a
A
\
!
IU
J
dein
14°
|
VRS
vR6e
*
ay.
veay:
a
APIN
J
pea
N,
‘
*
ye
swe
~
XN
Tape
speed
adjustment
VR
\
/
TP6
\
K
P
Fig.
1
NOTES:
Keep
good
condition,
set
switches
and
controls
in
the
following
positions,
unless
otherwise
specified
@
Make
sure
heads
are
clean
e
Tape
selector.
Normal
position
@
Make
sure
capstan
and
pressure
roller
are
clean
@
Input
selector:
Line
in
©
Judgeable
room
temperature:
20
+5°C
(68
+
9°F
)
®@
Input
level
controls:
Maximum
®
Dolby
NR
switch:
OUT
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.
®
Playback
frequency
response
Condition
+
Playback
mode
*
Tape
selector
--
Normal
position
Equipment
*VTVM
+
Test
tape---
*
Oscilloscope
QZZCFM
ony
fig.
3.
Test
equipment
connection
is
shown
in
ITEM
MEASUREMENT
&
ADJUSTMENT
Playback
frequency
response
chart
RS-M226
@
Playback
gain
Condition
*
Playback
mode
*
Tape
selector
-»Normal
position
Equipment
*VTVM
*
Test
tape--:
*
Oscilloscope
QZZCFM
@
Erase
current
Condition
*
Record
mode
*
Tape
selector
--
Metal
position
Equipment
«VTVM
*
Oscilloscope
2.
Place
UNIT
into
playback
mode
aig
100
hee
7
+6d8
3.
Playback
the
frequency
response
test
rade
Se
-
ee
are
$hc8
tape
(QZZCFM)
sae
m@annuiaeal
4
Measure
output
level
at
315Hz,125kHz
|
#8
:
2H
haa
8kHz, 4kHz,
1kHz,
250Hz,
125Hz
and
=
|7
288
ial
248
63Hz.
and
compare
each
output
level
4
erie
q
foe
“To
408
with
the
standard
frequency
315
Hz.
at
eG
oon
|
eas
r
ai
This
*
rivets
LINE
OUT
200Hz
500
Hz
GkHz
10kHz
5.
Make
measurement
for
both
channels
,
6
Make
sure
that
the
measured
value
is
Fig.
9
within
the
range
specified
in
the
frequency
response
chart
(shown
in
fig.
9).
1
Test
equipment
connection
is
shown
in
fig.
3.
2.
Playback
standard
recording
level
portion
on
test
tape
(QZZCFM
315Hz),
and
using
VTVM
measure
the
output
level
at
LINE
OUT
3.
Make
measurement
for
both
channels
Standard
value:
455mV+1dB
[around
280
mV:
at
test
points
TP3
(L-CH)
and
TP4
(R-CH)]
Adjustment
RQ
tf
measured
value
is
not
within
standard,
adjust
VR3
(L-CH),
VR4
(R-CH)
(See
fig.
1
on
page
3).
After
adjustment.
check
“Playback
frequency
response’
again
Test
equipment
connection
1s
shown
in
fig.
10.
Press
the
record
and
pause
buttons
1
2
3.
Set
the
tape
selector
to
metal
position
4
Read
voltage
on
VT
VM
and
calculate
erase
current
by
following
formula
Erase
current
(A)
=
Voltage
across
both
ends
of
R124
1
(Q)
Standard
value:
155+15mA
(Metal
position)
5.
If
measured
value
is
not
within
standard,
adjust
as
follows
Adjustment
1.
Open
the
point
(A)
and
short
the
point
(B)
on
the
main
circuit
board
in
the
wiring
connection
diagram
(See
page
15).
2.
Make
measurement
for
erase
current
3.
Make
sure
that
the
measured
value
is
within
the
erase
current
of
140
mA
to
170mA
4.
If
it
is
beyond
the
value,
carry
out
the
following
adjustments
*
If
the
erase
current
is
less
than
140
mA,
short
the
point
(A)
*
{f
the
erase
current
is
more
than
170
mA,
open
the
points
(A)
and
(B)
©
Overall
frequency
response
Condition
*
Record/playback
mode
*
Tape
selector
--
Normal
position
--CrOQ.
position
--Metal
position
*
Input
level
controls
---
MAX
Equipment
*VTVM
*
AF
oscillator
*
ATT
*
Oscilloscope
*
Resistor
(60002)
*
Test
tape
(reference
blank
tape)
---QZZCRA
for
Normal
“+
QZZCRX
for
CrOz
*-QZZCRZ
for
Metal
Note
:
Before
measuring
and
adjusting,
make
sure
of
the
playback
frequency
response
(For
the
method
of
measurement.
please
refer
to
the
playback
frequency
response}
Overall
frequency
response
adjustment
by
recording
bias
current
Note
1:
On
RS-M226.
overall
frequency
response
1S
adjusted
with
tape
selector
set
at
Normal
Note
2:
Recording
equalizer
is
fixed
1.
Make
connections
as
shown
in
fig.
12.
-
24
dB
signal
through
LINE
IN.
Place
the
set
in
record
2.
Input
a
1
kHz.
mode
Erase
head
Record
mode
=!
vM
Oscilloscope
Fig.
10
Overall
frequency
response
chart
(Norma!)
50Hz
100Hz 200Hz
300
Hz
500Hz
LkHz
2kHz 4kHz
8kKHZ10kHz
Record/playback
!
head
TP]
(L-CH)
TP2
(R-CH)
R1
(t-CH)
R2(R-CH)
Ground
3.
Fine
adjust
the
attenuator
to
obtain
0.4V
LINE
OUT
output.
+
Make
sure
that
the
input
signal
level
is
24+4dB
with
0.45V
output
voltage
Fig.
11
VRQ
(L-CH)
VR10
(R-CH)
LINE
VIVM
——
For
overall
frequency
response
measurement
oscilloscope
VTVM
FVM
oscscoe
arse
ears
bias
current
measurement.
Fig.
12
RS-M226
ITEM
MEASUREMENT
&
ADJUSTMENT
Set
the
tape
selector
to
Normal,
and
load
the
test
tape
(QZZCRA)
Adjust
the
attenuator
to
reduce
the
input
signal
level
by
20dB
Adjust
the
AF
oscillator
to
generate
50Hz,
100
Hz,
200Hz,
500Hz,
1
kHz,
4kHz,
8kHz
and
10
kHz
(ooo
signals,
and
record
these
signals
on
the
test
tape
Playback
the
signals
recorded
in
step
6,
and
check
if
the
frequency
response
curve
is
within
the
limits
shown
in
the
overall
frequency
response
chart
for
normal
tapes
(fig.
11).
(If
the
curve
is
within
the
charted
specifications,
proceed
to
steps
8,
9
and
10.)
If
the
curve
is
not
within
the
charted
specifications,
adjust
as
follows,
Adjustment
(A):
When
the
curve
exceeds
the
overall
frequency
response
chart
specifications
(fig.
11)
as
shown
in
fig
13.
fe
ee
+6dB
+
one
=
t
ct
—4dB
—t—4—f
ett
608
rae
1
—
gap
VkH2
2kHz 4kHz
8kHz1OkHz
Fig.
13
1)
Increase
bias
current
by
turning
VR9
(L-CH)
and
VR10
(R-CH).
(See
fig.
1
on
page
3.)
Repeat
steps
6
and
7
to
confirm
NO
(Proceed
to
steps
8.
9
and
10
if
the
curve
1S
now
within
the
charted
specifications
in
fig.
11.)
3)
If
the
curve
still
exceeds
the
specifications
(tig.
11),
increase
bias
current
further
and
repeat
steps
6
and
7
8.
Switch
the
tape
selector
to
CrO:.
change
test
tape
to
QZZCRX,
and
record
50Hz.
100Hz.
200
Hz,
500Hz,
1
kHz,
4kHz,
8kHz,
10kHz
and
12.5
kHz
signals
the
signals
and
check
if
the
curve
is
within
the
limits
shown
in
the
overall
frequency
response
chart
for
CrO»
tapes
(fig.
15).
9.
Switch
the
tape
selector
to
Metal.
change
test
tape
to
QZZCRZ,
and
Then,
playback
Adjustment
‘B):
When
the
curve
falls
below
the
overall
frequency
response
chart
specifications
(fig
11)
as
shown
in
fig.
14,
4
Ti+
408
re)
ttt
+
208
>
HOB
3
—150B
Toy
~
208
i
=
H
4dB
Pree
teed
+t
tt
eae
roy
|
8
dB
LkH2
2kHz
4kHz
8kHz10kHz
as,
|
oe
i
+4
54B
Fig.
14
1)
Reduce
bias
current
by
turning
VR9
(L-CH)
and
VR10
(R-CH).
2)
Repeat
steps
6
and
7
to
contirm
(Proceed
to
steps
8.
9
and
10
if
the
curve
is
now
within
the
charted
specifications
in
fig
11)
3)
If
the
curve
still
falls
below
the
charted
specifications
(tig.
11),
reduce
bias
current
further
and
repeat
steps
6
and
7
50Hz
100Hz
200Hz
Overall
frequency
response
chart
(CrO2,
Metal)
PTT
1kHz
2kHZ
4kHz
uly
\12.5
KHz
kHz
0
Fig.
15
record
50Hz.
100Hz,
200Hz,
500Hz.
1
kHz,
4kHz,
8kHz,
1OKHz
and
12.5
kHz
signals
playback
the
signals
and
check
if
the
curve
1s
within
the
limits
shown
in
the
overall
frequency
response
chart
for
metal
tapes
(tig.
15).
positions.
*
Read
voltage
on
VTVM
and
caiculate
bias
current
by
following
formula:
Bias
current
(A)
=
Value
read
on
VTVM
(V)
10
(Q)
Then,
10.
Confirm
that
bias
currents
are
approximately
as
follows
when
the
tape
selector
is
set
at
different
around
350A
(Normal
position)
around
450zA
(Cr02
position)
around
700A
(Metal
position)
\
measured
at
TP1
(L-CH)
and
TP2
(R-CH)
@®
Overall
gain
Condition
:
+
Record/playback
mode
*
Tape
selector
seanee
Normal
position
*
Input
level
controls
---
MAX
*
Standard
input
level;
MIC
«+--+
—72+4dB
LINE
IN---
—-24+4dB
Vv
position.
ATT
to
LINE
IN.
A
0.45V.
Using
test
tape,
make
recording.
P
OUT
on
VTVM
becomes
0.45V.
Test
equipment
connection
is
shown
in
fig.
16.
ace
UNIT
into
record
mode,
and
tape
selector
to
normal
Supply
1
kHz
signal
(—24
dB)
from
AF
oscillator,
through
djust
ATT
until
monitor
level
at
LINE
OUT
becomes
layback
recorded
tape,
and
make
sure
the
value
at
LINE
AF
oscillator
LINE
IN
Record/playback
head
Test
tape
Fig.
16
Record
mode
Test
tape
Playback
mode
ytym
Oscilloscope
RS-M226
ITEM
MEASUREMENT
&
ADJUSTMENT
Equipment
:
7.
if
measured
value
is
not
0.45V,
adjust
VR5
(L-CH),
VR6
+*VTVM
_
+
AF
oscillator
(R-CH)
(See
fig.
1
on).
*ATT
*
Oscilloscope
8.
Repeat
from
step
(2)
+
Resistor
(600
2)
»
Test
tape
(reference
blank
tape)
-+-QZZCRA.
for
Normal
@
Fluorescent
meter
.
Test
equipment
connection
is
shown
in
fig.
16.
Condition:
.
As
shown
in
fig.
17,
connect
the
collector
of
Q8
and
peak
reset
terminal.
*
Tape
selector
.
Supply
1kHz
signal
(—24
dB)
to
the
LINE
IN
Normal
position
jack,
then
press
the
record
button.
+
Input
level
controls
--»
MAX
_
Adjust
the
ATT
so
that
the
output
level
at
LINE
OUT
jack
becomes
0.45
V
(The
input
level
at
Equipment:
;
this
condition
is
termed
the
standard
input
Connection
+
VTVM
*
AF
oscillator
level)
uN
cord
*
ATT
.
Adjustment
at
"—20dB"
A.
Adjust
the
ATT
so
that
input
level
is
—20dB
below
standard
recording
level
B.
Adjust
VR7
so
that
the
—20dB
segment
>
lights
up
in
the
—20
+
1dB
range
(L-CH
Ly
ONLY)
(See
fig.
18)
SUTETTTTTTETT
TTT
ET
HTT
5.
Adjustment
at
“OdB":
20
(Fak)
6
©
4+
20+
2
00-68:
A.
Adjust
the
ATT
so
that
the
output
level
at
Fig.
18
LINE
QUT
jack
becomes
0.45V.
MMS
(The
input
level
at
this
condition
is
termed
vesveseeaserisesisaasssersaseesecsese
FOB)
the
standard
input
level.)
t
SHMUOOUUQUAOUUATOL
AUT
A
UAV
ALT
AT
LAUUHT
TUT
.
Adjust
VR8
so
that
the
+1dB
segment
20
(ER)
pee
nae
-2+*0+2
00-628
lights
up
in
the
00.2
dB
range
of
the
Fig.
19
*
Record
mode
Fig.
17
standard
input
level
(See
fig.
19).
CC
Repeat
twice
between
steps
5
and
6
above.
i
.
Adjust
ATT
and
check
that
all
segments
light
SS
ITTULTUUEUUMTUUATUUUTOULCUUUU
TDCI
vt
Pus
vrs
PIVTINERYELULASEAS
EASE
SOEEEEY
ET
up
when
an
input
signal
level
is
increased
to
20
bah
airs
shee
eat
10
dB
higher
than
the
standard
input
level
(See
ee
Fig
20.
sc
a
fig.
20).
©
Dolby
NR
circuit
Dolby
circuit
frequency
response
check
Condition:
@
Check
of
the
Dolby-B
type
encoder
characteristics
*
Record
mode
.
Make
connections
as
shown
in
fig.
21.
*
Dolby
NR
switch
-+-
IN/OUT
.
Set
the
unit
to
the
record
mode.
(NR
select
switch
is
OUT.)
*
Dolby
NR
select
switch
.
Apply
a
1
kHz
signal
to
LINE
IN.
++B/C
.
Adjust
the
ATT
so
that
the
output
level
at
TP3
(L-CH)
and
TP4
(R-CH)
is
12.3
mV.
*
Input
level
controls
MAX
.
The
output
level
at
pin
14
should
be
0dB.
Equipment:
.
Set
the
NR
select
switch
to
B,
and
make
sure
that
the
output
signal
level
at
pin
14
of
IC3
(L-CH)
and
*VTVM
—
*
AF
oscillator
IC4
(R-CH)
is
+6dB+2.5dB.
*
ATT
*
Oscilloscope
.
Set
the
NR
select
switch
to
OUT,
and
adjust
the
frequency
to
5kHz.
The
output
signal
level
at
pin
*
Resistor
(600
Q)
14
should
be
OdB.
;
.
Set
the
NR
select
switch
to
B
and
make
sure
that
the
output
signal
level
at
pin
14
of
IC3
TP3
(L-CH)
(L-CH)
and
IC4
(R-CH)
is
8dB+2.5¢B.
re
©
Check
of
Dolby-C
type
encoder
characteristics
9.
Repeat
steps
1-5
above.
10.
Set
the
NR
select
switch
to
C
and
make
sure
that
the
output
signal
level
at
pin
14
of
IC3
;
(L-CH)
and
IC4
(R-CH)
is
11.5dB+2.5dB.
fate
{ite
(L-CH)
2
11.
Set
the
NR
select
switch
to
OUT
and
adjust
Ica
(R-CH)
EN
ere
the
frequency
to
5kHz.
The
output
signal
at
Fig.
21
pin
14
should
be
OdB.
9-
.
Set
the
NR
select
switch
to
C
and
make
sure
that
the
output
signal
level
at
pin
14
of
IC3
(L-CH)
and
IC4
(R-CH)
is
8.5dB+2.5dB.
RS-M226
ELECTRICAL
PARTS
LOCATION
Q14,
15
5-Core
flat
cable
White
line
aa
=
Connector
[4]
ree
(Flat
Cable
connecter)
Open
the
lid
of
connector
G]
in
the
direction
of
the
arrow
as
shown
above,
and
extract
the
5-Core
flat
cable
to
disconnect.
REPLACEMENT
PARTS
LIST
Important
safety
notice
Components
identified
by
A
mark
have
special
characteristics
important
for
safety.
When
replacing
any
of
these
components,
use
only
manufacturer’s
specified
parts.
Ref
No.
Part
No.
|
Part
Name
&
Description
Ref No.
Part
No.
Part
Name
&
Description
ELECTRICAL
PARTS
E7
QuS1961S
Flat
Cable
Connector
E8
QJUT1090
Pin
Terminal-A
E1
QWY4122Z
Record/Playback
Head
(Test
Point)
E2
QWY2138Z
Erase
Head
EQ
SJT777
Pin
Terminal-B
E3
(AC
Power
Cord)
[D]
A
RJA23ZC
AC
Power
Cord
E10
NO39
Heat
Sink
[For
all
European
areas
except
United
Kingdom.}
([B)A
QFC1205M
AC
Power
Cord
E11
QJS1923TN
9
Pin
Socket
{For
United
Kingdom.]
E12
QJT1054
Contact
4
QSiFLOO6F
FL
Meter
E13
QJS1921TN
3
Pin
Socket
5
QJP1921TN
3
Pin
Post
E14
A
QTF1054
Fuse
Holder
6
QJP1923TN
9
Pin
Post
BLOCK
DIAGRAM
Recording
System(L-CH
ONLY)
RS-M226
INPUT
SELECT
SWITCH
=_>—
>
~
LINE
LINE
<—»®
MIC
$2-4
$2.2
LEVEL
CONTROL
a
oT>
|
©
pr
sts]
Ly
Pp
VR5
RECORDING
FOAM
GAIN
ADJUSTMENT
VR
MICROPHONE
AMP
RECORD/PLAY
BACK
HEAD
=
§
VR10
BIAS
Y-
CURRENT
@)
)
ADJUSTMENT
VR
Metal
>
e
(6)
J
x
$6-3
Cro,
[-—}
O ©
TAPE
SELECT
is
Se
oe
Ee
5
0
fo
SWITCH
Normal
07
RECORD
INDICATOR
a
ERASE
HEAD
|
Metal
-O
6-1
cro,
O
|
!
|
|
|
|
|
Le
BIAS
OSC
Playback
System
(L-CH
ONLY)
RECORD/PLAYBACK
HEAD
1C1
PLAYBACK
EQ
AMP
PLAYBACK
GAIN
ADJUSTMENT
a
MUTING
FF/REWIND
CONTROL
|
MUTE
i
r
FF/REWIND
CR
NETWORK
MUTING SWITCH
(70ys)
|
|
|
L
Cro,
Normal
©
O
Metal
O
S6-2
i
TAPE
SELECT
SWITCH
Power
Supply
System
1C7
a
METER
&
HEADPHONES
AMP
Th
VOLTAGE
REGULATOR
DOLBY
NR
SECTION
103-6
FL
METER
SECTION
IC8
Q15
VOLTAGE
REGULATOR
NOTE:
*
Dolby
NR......
OFF
°
(mmm
)
this
arrow
indicates
the
flow
of
the
recording
signal.
¢
(<>)
)
this
arrow
indicates
the
flow
of
the
playback
signal.
MUTING
CONTROL
Q11—13
FL
METER
FILAMENT
(\
D13—16
|
RECTIFIER
CAPSTAN
MOTOR
T
HEADPHONES
(2)
~~
V
METER
&
HEADPHONES
RS-M226
DOLBY
SYSTEM
(L-CH
ONLY)
LINE
OUT
Dolby-B
Encode
MIC.
MIC
IN
AME
Ic3
section
to
check
the
frequency
Mien
tiie
iit
NE6S4N
response
of
the
Dolby
circuit
in
the
O
HEADPHONES
AMP
A +
vRi
Ics
illustration.
NE652N
LINE
IN
5
()
q
O
oO
C
RECORD
AMP
MPX
FILTER
(2)
HEADPHONES
JACK
METER
HEADPHONES
LINE
OUT
Q8,
9
PEAK
HOLD
O
SET/RESET
UI
+4
H.F—O—O—0O
>
IS
YMd
A0/0/8
O—D—_5—O—©
3
HIGH
PASS
FILTER
im
N
Dr
[2
ae
O)—©)
S)—®)
(©)
Le
>
©
DOLBY
NR
CIRCUIT
FREQUENCY
RESPONSE
HEADPHONES
Pee
1kHz:
+6dB+2.5dB
JACK
Ty
5kHz:
+
8dB+2.5dB
Dolby-B
Decode
VR5
Q8,
9
PEAKHOLD
SET/RESET
METER
HEADPHONES
LINE
OUT
ddNS
YMd
AsO/0/8
x
POWER
ON/OFF
SWITCH
~~
&£
HIGH
PASS
FILTER
PB
EQ
AMP
Refer
to
Item
©
“Dolby
NR
circuit”
of
the
measurement
and
adjustment
Dolby-C
Enca
LINE
IN
(G
O
E
MPX|
METER
HEADPHONES.
LINE
OUT
(G
Spectra
skewing
networ!
LS
Low
level
stage
integrating
filter
Anti-satur:
Low
level
stage
high
pass
filter
REC
EQ
AMP
Dolby-C
Deca
METER
HEADPHONES
LINE
OUT
Spectral
skewing
network
Low
level
stage
integrating
filter
PB
EQ
Low
level
stage
high
pass
filter
Anti-Saturation
filta
RS-M226
LINE
OUT
METER
&
HEADPHONES
AMP
HEADPHONES
JACK
~~
Q8,
9
PEAK
HOLD
SET/RESET
FL
METER
DRIVE
FL
METER
YN)
—~___
$4
an
|
!
|
|
|
Ste)
LINE
OUT
©
&
HEADPHONES
HEADPHONES
AMP
JACK
—vV,
Q8,
9
PEAKHOLD
SET/RESET
POWER
ONIOFF
~1.
SWITCH
C200
RS-M226
DOLBY
SYSTEM
(L-CH
ONLY)
Dolby-B
Encode
Refer
to
Item
©
“Dolby
NR
circuit”
of
the
measurement
and
adjustment
AMP
section
to
check
the
frequency
MIC
IN
Ic3
babahietes
NE654N
response
of
the
Dolby
circuit
in
the
vRi
Ics
illustration.
NE652N
LINE
IN
(1)
q
O
O
e
RECORD
g
;
MPX
FILTER
a
i
NeTER
SS
es
l
@
HEADPHONES
(4)
+
>
<2)
LINE
OUT
ar<d
G)
N
ee
cE
all
@
Yl
BUFFER
AMP
<6
|
i
(4)
3
G)
(6)
HIGH
PASS
FILTER
DOLBY
NR
CIRCUIT
FREQUENCY
RESPONSE
Sy
ddNS
YMd
©
Low
level
stage
integrating
filter
Low
level
stage
high
pass
filter
TT)
i
>=
o—o—o-4
1kHz:
+6dB+2.5dB
VR5
REC
EQ
AMP
5kHz:
+
8dB+2.5dB
=
Dolby-B
Decode
IC3
1c5
NE654N
NE652N
METER
HEADPHONES
LINE
OUT
IddNS
YMd
Z|
~~
&
HIGH
PASS
FILTER
Low
level
stage
integrating
filter
PB
EQ
AMP
Low
level
stage
high
pass
filter
rd
Refer
to
Item
©
“Dolby
NR
circuit”
of
the
measurement
and
adjustment
section
to
check
the
frequency
response
of
the
Dolby
circuit
in
the
illustration.
Dolby-C
Encode
MIC
IN
MIC
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IC3
NE654N
VR1
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NE652N
HIGH
LEVEL
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MPX
FILTER
High
level
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High
level
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Low
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Low
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—
Dolby-C
Decode
Ic3 1c5
HIGH
LEVEL
NE654N
NE652N
STAGE
High
level
stage
signal
High
level
stage
high
pass
filter
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High
level
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OUT
High
level
stage
main
chain
signal
TddNS
YMd
XK
4sd0/0/8
High
level
stage
side
chain
network
Spectral
skewing
network
Low
level
stage
side
chain
network
Low
level
stage
integrating
filter
Low
level
stage
high
pass
filter
Anti-Saturation
filter
LOW
LEVEL
STAGE