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