Sony TC-188SD User manual

Mode!
E
Model
SPECIFICATIONS
GENERAL
Frequency
Response:
DOLBY
NR
OFF
Power
Requirements:
110V,
120V,
220V,
240V
ac,
50/60
Hz
With
Ferri-Chrome
cassette
20—16,000
Hz
(NAB)
Power
Consumption:
11W
30—15,000
Hz
+3dB
(NAB)
Dimensions:
Approx.
440
(w)
x
145
(h)
x
290
(d)
mm
30—15,000
Hz
(DIN)
17
1/4
(w)
x
53/4
(h)
x
113/g
(d)
inches
With
chromium
dioxide
cassette
20—16,000
Hz
(NAB)
30—15,000
Hz
+3dB
(NAB)
|
30—15,000
Hz
(DIN)
TAPE
RECORDER
SECTION
With
regular
cassette
Track:
4-track
2-channel
stereo
20—14,000
Hz
(NAB)
Fast
Forward
30—13,000
Hz
(DIN)
Rewind
Time:
Approx.
90
seconds
with
Sony
cassette
C-60
Wow
and
Flutter:
0.08%
WRMS
(NAB)
+0.2%
(DIN)
S/N
Ratio:
DOLBY
NR
OFF
Weight:
Approx.
6.3
kg,
13
Ib
140z
*
‘Dolby’
and
the
double-D
symbol
are
the
trade
marks
of
With
Ferri-Chrome
cassette
Dolby
Laboratory
Inc.
Noise
reduction
system
manufac-
58
dB
at
peak
level
(NAB)
tured
under
license
from
Dolby
Laboratory
Inc.
56
dB
(DIN,
1975
rev.)
*0dB=0.775V
| |
48
dB
(DIN,
old)
With
chromium
dioxide
cassette
54
dB
at
peak
level
(NAB)
SAFETY-RELATED
COMPONENT
WARNING!!
DOLBY
NR
ON
Improved
by
5dB
at
1
kHz,
10dB
COMPONENTS
IDENTIFIED
BY
SHADING
ON
THE
sbove’s
Kuz
SCHEMATIC
DIAGRAMS
AND
IN
THE
PARTS
LIST
ARE
CRITICAL
TO
SAFE
CPERATION.
REPLACE
THESE
COMPONENTS
WITH
SONY
PARTS
WHOSE
PART
NUMBERS
APPEAR
AS
SHOWN
IN
THIS
MANUAL
OR
IN
SUPPLEMENTS
PUBLISHED
BY
SONY.
7
—
Continued
on
next
page
—
®
AANUAL
667
a
Sees
GR
kets
cont
nee
A
ase
2
seni

T=SGoU
Total
Harmonic
Distortion:
Bias
Frequency:
Inputs:
Outputs:
1.3%
105
kHz
MIC
(two
phone
jacks)
Sensitivity:
0.2
mV
(-72
dB)
Impedance:
for
low-impedance
microphone
LINE
IN
(two
phono
jacks)
Sensitivity:
0.06V
(-22
dB)
Impedance:
100
kQ
REC/PB
(connector)
Input
impedance:
less
than
10kQ
LINE
OUT
(two
phono
jacks)
Normal
level:
0.435V
(-5dB)
Load
impedance:
100
k2
suitable
load
impedance
more
than
10kQ
HEADPHONES
(binaural
jack)
Load
impedance:
for
low-impedance
headphones
REC/PB
(connector)
Output
impedance:
less
than
10k
0dB=0.775V

“L-L
MIC
REC/PB
$305
ANE
3
SI0l=
5
INPUT
SELECT
|
101-3
>
REC
MUTE
2)
r
>}
RV
101
i
el
5305-3
FORWARD
‘
REC
LEVEL
Se
'
LINE
AMP
BUFFER
AMP
>
;
Z|
D
FAST
F
Q105,
106
Q107
hm
L.
Rewind?
CNJ201-1
©
[LINE
OUT
INVYSVIG
WO01E8
5
\
3603
MUTING
“%
eta
PRESSING
DOLBY
NR
ONE
OF
FUNCTION
CIRCUIT
B+
\
BUTTONS
Q108~112
[HEADPHONE
101
RV103
METER
AMP
3|£
38
REC
LEVEL
a113
S10!-3
=
ae
S101-1
|
np
a
PLAYBACK
R-CH
aa
of
HRP
==
co
C4)
ME
101
sa
eet
D101
>
S
PLAYBACK
E
—
RECORD
.
—_
EQ
D301,
302
B+
Bren
R-CH
SERVO
AMP
CIRCUIT
HE
Saige
Q601~603
Q302
D303,
304
T301
e
R-CH
IS
OMITTED
/
308,
309

TC-188SD
|
2-1.
REMOVAL
SECTION
2
DISASSEMBLY
Top
Case
and
Bottom
Cover
Removal
Top
Case
Removal:
@-—@
Bottom
Plate
Removal:
@,
@
top
case
Oo
case
Screws,
@BW4x22
3)
case
screws,
®BW4x22
|
i
i
”
six
screws,
BV3x6
Vv
77
bottom
plate
Cassette
Lid
Removal
cassette
lid
|
A
cassetre
holder

TC-188SE
Deck
Mechanism
Removal
deck
mechanism
7)
Remove
the
record
link
plate.
@
Remove
cord.
PSW3x6
Cassette
Holder
Removal
Remove
four
retaining
rings
and
a
screw.
er
;
screw,
retaining
rings,
E
2.5
PTPWH
2.6x6
retaining
ring,
E
2.5
retaining
ring,
:
E2.5

TC-188SD
|
VU
Meter
Lamp
Removal
1)
Release
the
claws.
Panel
Removal
Pull
off
knobs.
©
é——
BV
3x6
(3)
@
Remove
tape.
—
:
lamp
Te
as
J
meter
escutcheon
(Part
No.
1-518-273-00)
a
[P<
meter
cover

|
TC-188SD
SECTION
3
ADJUSTMENTS
3-1.
MECHANICAL
ADJUSTMENTS
PRECAUTION
Clean
the
following
parts
with
a
denatured-
alcohol-moistened
swab:
record/playback
head
pinch
roller
erase
head
rubber
belts
capstan
idlers
Playback
Back
Tension
Torque
Adjustment
—
Playback
Mode
—
Use
type
CQ-102A
cassette
torque
meter.
Demagnetize
the
record/playback
head
with
a
head
demagnetizer.
(Do
not
bring
the
head
demagnetizer
close
to
the
erase
head.)
Do
not
use
a
magnetized
screwdriver
for
the
supply
reel
spindle
adjustments.
After
the
adjustments,
apply
a
suitable
locking
compound
to
the
parts
adjusted.
Ey
5.
The
adjustments
should
be
performed
with
the
rated
power
supply
voltage
unless
other-
wise
noted.
Change
the
hooking
position.
back
tension
fever
Tape
Path
Adjustment
—
Playback
Mode
—
1.
Make
an
adjustment
cassette
as
shown
below.
Specification:
2.5—3.5
g-cm
(0.035—0.048
oz-inch)
OE):
—
C-120
oS
Cut
out
hatched
tape
cassette
portions.
2.
In
playback
mode
and
viewing
from
the
front,
adjust
the
head
heights
to
eliminate
tape
curl
and
tape
twist
at
arrowed
portions.
erase
head
record/playback
3-513-237-01
(t=0.1)
3-513-237-11
(t=0.2)
Shim,
head
height
adjustment
screwdriver

Pinch
Roller
Pressure
Adjustment
—
Playback
Mode
—
Hook
the
pinch
roller
with
a
spring
scale.
Pull
the
spring
scale.
Slowly
return
the
pinch
roller
and
read
the
spring
scale
just
when
the
pinch
roller
starts
to
rotate.
pinch
roller
Shut-off
Time
Measurement
Specification:
Within
six
seconds
PAUSE
Timing
Adjustment
—
PAUSE
Mode
—
pinch
roller
ee
)
Bend
up
or
down.
Bend
here
and
adjust
the
position
of
pinch
roller
so
that
the
rotations
of
pinch
roller
and
reel
spindles
stop
at
the
same
time
when
slowly
de-
pressing
PAUSE
button.

Motor
Switch
(S602)
Position
Adjustment
Timing
Switch
(S601)
Position
Adjustment
—
Stop
Mode
—
—
Stop
Mode
—
Loosen
adjustment
screw
and
adjust
the
Loosen
the
screws
and
adjust
position
of
the
position
of
the
switch
for
the
specified
clearance
switch
bracket
as
marked
B
in
figure
below.
between
the
switch
leaves.
After
the
adjustment,
tighten
the
screws.
After
the
adjustment,
tighten
and
lock
the
screw
with
a
suitable
locking
compound.
motor
switch
(S602)
5.5—6.5mm
(7/32—VY%q")
timing
switch
(S601)
adjustment
screw
brake
release
lever
Contacts.
switch
bracket
Forward
Torque
Adjustment
—
Playback
Mode
—
Use
type
CQ-102A
cassette
torque
meter.
tension
arm
adjustment
plate
change
the
hooking
position
(Approx.
3g-cm/one
step)
Specification:
28—50
g-cm
(0.39—0.69
oz-inch)

TC-188SD
Fast
Forward
and
Rewind
Torque
Adjustment
—
Fast
Forward
and
Rewind
Modes
—
Use
type
CQ-201A
cassette
torque
meter.
Bend
the
spring
for
the
torque
of
55—95
g-cm
(0.77—1.3
oz-inch).
fly
wheel
"A
Bend
to
right
or
left.
spring
10
Muting
Switch
(S603)
Position
Adjustment
—
Stop
Mode
—
Loosen
the
adjustment
screw
and
adjust
the
position
of
the
switch
as
specified.
muting
switch
(S603)
7.0—1.5mm
to
contact
adjustment
screw
button
lock
plate

Vv
3-2.
ELECTRICAL
ADJUSTMENTS
Note:
The
adjustments
should
be
performed
in
the
order
given
in
this
service
manual.
The
adjustments
should
be
performed
for
both
L-CH
and
R-CH.
Switches
should
be
set
as
follows
unless
other-
wise
specified.
DOLBY
NR
switch:
OFF
EQ
switch:
NORMAL
BIAS
switch:
NORMAL
BIAS
and
EQ
switch
settings
in
accordance
with
tape
used
are
as
follows.
[tape
|
BlASswitch
|
EQswitch
Standard
Record
Supply
the
standard
input
level
signal
to
the
LINE
IN
jack
and
set
the
REC
LEVEL
control
to
obtain
the
standard
output
level.
Standard
Input
Level
:
0.77mV
|
0.25
V
input
level
(-60dB)
|
(-104B)
Standard
Output
Level
-HEAD-
load
impedance
|
100k2
50k2
0.44V
39mV
0.44V
output
level
REC/PB
100
k2
17mV
(-33
dB)
(-5
dB)
(-26
dB)
(-5
dB)
==
14
|
TC-188SD
Tape
Speed
Adjustment
Procedure:
Mode:
Playback
speed
checker
LFM-30
or
digital
frequency
counter
test
tape
WS-48
(3kHz,
0dB)
LINE
OUT
Adjust
RV602
to
obtain
the
specified
values
below.
Specification:
Frequency
difference
between
beginning
and
end
of
tape
should
be
within
0.7%
(20
Hz).
Adjustment
Location:
-
RV602
If
correct
tape
speed
cannot
be
obtained
by
adjusting
RV602,
Solder
CG)
or
(2).
servo
amp
board
601
®D
oT
Vi0
VIO
@-
Solder
portion
Tape
speed

TC-188SD
Record/playback
Head
Azimuth
Adjustment
Playback
Level
Adjustment
Procedure:
Procedure:
1.
Mode:
Playback
1.
Mode:
Playback
test
tape
P-4-A81S
VTVM
oo
cae
(6.3
kHz,
-10
dB)
(333
H
VTVM
100k2
|
7
z,
OB)
LINE
OUT
LINE
OUT
2.
Turn
the
adjustment
screw
for
the
maximum
0.55V
(-3
dB)
level
and
set
it
to
the
mechanical
mid
position
between
L-CH
and
R-CH
peak
position.
Adjust
RV102
(L-CH)
and
RV202
(R-CH)
to
obtain
0.55
V
(-3
dB)
VIVM
reading.
2.
Assure
that
the
LINE
OUT
level
does
not
change
when
the
mode
is
changed
from
play-
L-CH
back
to
stop
several
times.
peak
eb
sae
Specification:
LINE
OUT
level:
0.52—0.58V
R-CH
within
0.5
dB
(-2.5
—-3.5
dB)
adjustment
Peak
rr
Level
difference
between
channels:
Screw
shel
ae
Tce
less
than
0.5dB
3.
Mode:
Playback
Adjustment
Location:
test
oy
P-4-A81S
RV102
(L-CH)
RV202
(R-CH)
(6.3kHz,
-10dB)
L-CH
100k2
oscilloscope
te
&
O&
en
Ya
€
io
.
Sar
ae
ee
Oo
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ete
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3
Negecdiaameuats
ane
peer
whe
~
Lr
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ik
Bie
“3
a
ror
al
ea
we
“
LINE
OUT
Screen
pattern
in-phase
45°
90°
ade
180°
ed
good
wong
Adjustment
Location:
adjustment
screw

VU
Meter
Calibration
Procedure:
1.
Mode:
Standard
record
(See
page
11.)
af
osc
O
attenuator
14
O-—=-O
LINE
OUT
LINE
IN
0.44V
(-5
dB)
333.Hz,
0.25V
(-10dB)
2s
VU
meter
reading:
0
VU
Adjust
the
pattern
connection.
Specification:
When
the
LINE
IN
level
is
adjusted
to
make
0
VU
indication,
VTVM
reading
should
be
0.44V
(-5
dB).
Adjustment
Location:
‘
¢
€
+
ge”
8,
fn
ef
ez
rs
oe
ee
2
¢
4
a
ser
t+
&
CQ
ck
t,
aS
%
%
185
285
TC-1885D
Record
Bias
Adjustment
Procedure:
1.
Mode:
Standard
record
(See
page
11.)
af
osc
blank
tape
SONY
CS-10
10k
attenuator
O
St1,00
0
LINE
IN
5
ieee
7.7mV
(-40dB)
2.
Mode:
Playback
—
vrei
100
k22
[7]
im
LINE
OUT
Adjust
C153
(L-CH)
and
C253
(R-CH)
to
make
10kHz
and
1
kHz
signal
output
levels
equal.
Level
difference
between
the
two
output
levels:
OdB+1dB
Adjustment
Location:
C253
(R-CH)
C153
(L-CH)
4)
t
w
a's
of
atict,
7
.
an
gfe
-pher
as,
Pa
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ry
at
ee
2
tose
t
a
a
pv:
3
ee
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on
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bas
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at
as
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te
ne
Record
Level
Adjustment
Procedure:
1.
Mode:
Standard
record
(See
page
11.)
blank
tape
;
SONY
CS-1
af
osc
C$-20
CS-30
10k2
attenuator
O
ETE
|
O-——O
O
(1G
00
O
LINE
IN
333Hz,
0.25
V
(-10dB)
2.
Mode:
Playback
recorded
portion
VTVM
LINE
OUT
Adjust
RV103
(L-CH)
and
RV203
(R-CH)
to
obtain
0.44V
(-5
dB)
VTVM
reading.
3.
Change
the
blank
tape
to
CS-20
and
CS-30,
and
perform
the
same
record
and
playback
pro-
cedure.
Measure
LINE
OUT
level.
Specification:
SONY
tape
CS-10
CS-20
CS-30
Adjustment
Location:
0.41-0.46V
(-4.5
—-5.5
dB)
0.37—-0.52V
(-3.5
—-6.5
dB)
RV103
(L-CH)
RV203
(R-CH)
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ee
ben
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ep
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tess
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*
19
kHz
Filter
Adjustment
Procedure:
DOLBY
NR
switch:
ON
Mode:
Standard
record
(See
page
11.)
_
af
osc
LINE
OUT
LINE
IN
19
kHz
+20Hz,
0.25V
(-100B)
Adjust
the
pattern
connection
for
a
minimum
reading
on
VT
VM.
Adjustment
Location:
connect
132
133
;
232
(L-CH)
C539
(R-CH)
Me
C
«
:
,
aA
«
&
”
ua
“oe
“ee
'
oes

4-7.
MOUNTING
DIAGRAM
—
Conductor
Side
—
Repiacement
Semiconductors
For
replacement,
use
semiconductors
except
in
|
).
Q101-103,
105,
109).
0201-203.
205,
209
}
2SC632A
(2SC631A)
Q104,
106—108,
110—113
Q204,
206-208,
210-213
-:
2SC634A
(2SC633A)
0303,
601,
602
c
B
|
E
a
C B
QO302:
2801475
2SC1760
2801761
Cc
&
D101,201:
1T22A
(1T22)
D102,
104).
oes
Boe
ae
181555
(1$2076)
D103,
203:
17T22A
D301—304)
.
D308
309
f
10E2
(1GE1)
D307,601:
181555
(1T40)
cathode
“
anode
D305:
EGBO1-21
(EQA01-21R)
cathode
D306:
SLP24B
(LED)
cathode
anode
cathe.
»
anode
weap
Note:
@
®
@
@
۩
6
iy
parts
extracted
from
the
component
side.
parts
extracted
from
the
conductor
side.
#:
part
mounted
on
the
conductor
side.
Color
code
of
sleeving
over
the
end
of
the
jacket.
Readings
are
taken
under
no-signal
conditions
with
a
VOM
(20
kQ/V).
|
4
;
4
ae
4.
AC
voltage
readings
indicated
by
~*
in
the
bias
oscillator
:
Bt
pattern.
:
signal
path.
(GRY)
eo
record/FORWARD
FORWARD
circuit
are
taken
with
a
VTVM.
102
602
103
102
601
60l
iN
HO
,12
109
209
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number
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no
:
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because
thy
3
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are
seldom
required
for
routine
service.
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screws
are
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recess)
type
unless
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spriny.
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lock
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amp
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leaf;
muting
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1-224-630-00
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variable
4702
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3-643-979-11
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Screw,
motor
5
3-542-461-00
®
Lock
Plate,
button
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