Sony TC-366 User manual

Set using ISO screws
SPECIFICATIONS
Power Requirements: AC %/60 Hz, 100V, 110V, 117V, REC/PB connector
125V, 220V and 240V, 20W Impedance: 10k2
Track System: Four-track stereo and mono Maximum sensitivity: -33d B (17mV)
Reel Size: 7” (18cm) maximum Outputs: Two LINE OUTputs
? Tape Speed: 71/ ips, 334 ips and 17% ips Impedance: 100kQ or more
(19 cm/s, 9.5 cm/s and 4.8 cm/s) Output level: OdB (0.775V)
; Recording Time: Fane apeed 4track 4track with 100k? load
(with 1,800 ft tape) stereo mono REC/PB connector
714 ips(19cm/s) 1.5hrs 3hrs Impedance: 100k load
3% ips(9.5em/s) Shrs 6 hrs Output level: -2~-6 dB (1,.62~0,385V)
1% ips (4.8cm/s) 6 hrs 12 hrs HEAD PHONE output
Frequency Response: 20~25,000 Hz at 744 ips (19cm/s) Impedance: 82 load
30~17,000 Hz at 3% ips (9.5cm/s) Output level: -28 dB (30m)
30~9,000 Hz at 1% ips (4.8 cm/s) Semiconductors: 27 transistors and 4 diodes
< Signal-to-Noise Ratio: 52 dB or better (at peak level recording) Dimensions: 1676 (W) x 8546 (H) x 14346" (D)
Flutter and Wow: 0.09% at 7!/, ips (19 cm/s) (416 x 210 x 376 mm)
0.12% at 334 ips (9.5 cm/s) Weight: 22 Ib 8 oz (10 kg)
0.17% at 1% ips (4.8 cm/s)
Recording Bias Frequency: Approx. 160 kHz
Inputs: Two MIC inputs
Impedance: 6002
Maximum sensitivity: - 72 dB (0.19 mV)
Two AUX inputs
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TABLE OF CONTENTS
Title _Page_
SPECIFICATIONS. .........ceeeccccccceeeeesseeseeseseeeeeeeereeees 1
1. GENERAL DESCRIPTION ...... ccc eee 2:
2. BLOCK DIAGRAM .........:cc:cceeeeeeseseeeeesscceeeeeenesees 2
3. CABINET — TOP VIEW — o..iceceecccceeeeeeeeeeee 3
4. CABINET — SIDE VIEWS — ouu..c.ce cc eeeseeeeeeeeeeee 3
5. CHASSIS ~— TOP VIEW —
6. CHASSIS — BOTTOM VIEW — wu. eeeeee 4
7. DISASSEMBLY .............0:
8. SCHEMATIC DIAGRAM
9. MOUNTING DIAGRAM
9-1. Record Amplifier Circuit Board ......... 9~10
9-2. Playback Amplifier Circuit Board ...... 11) ~12
9-3. Bias Oscillator Circuit Board... ee 13
9-4, Power Supply Circuit Board ....... eee 14
10. LEVEL DIAGRAM uu... eeeccccce eee ceteeeeree anne ane eeaeees 15
1.
GENERAL
DESCRIPTION
The
SONY
Model
TC-366
which
is
the
one-
motor,
three-head
stereo
deck
type
tape
recorder
equips
with
the
following
features,
Tape Tension Regulator
The
machine
can
operate
always
under
the
stable
tape
running
by
the
tape
tension
regulator
which
quickly
responds
to
the
subtle
change
of
tape
tension,
so
that
the
tape
tension
regulator
can
reduce
the
wow
and
flutter
extremely.
14. ELECTRICAL PARTS LIST
15. EXPLODED VIEW
Title Page
11. MECHANICAL ADJUSTMENT. ................ 16 ~ 24
12. ELECTRICAL ADJUSTMENT ................. 25~39
13. CONVERSION TO DIFFERENT
POWER LINE FREQUENCY
15-1. Packing
15-2. Cabinet — top view —
15-3. Amplifier Chassis — top view (1) «++ 46
15-4. Amplifier Chassis — top view (2) — 47~48
15-5. Head Deck — top view —_ «--.- 49~ 50
15-6. Chassis — top view (1) — -.:--ee eee SI~ 52
15-7. Chassis — top view (2) — .---+ 53 ~ 54
16. HARDWARES oo eesessececcsscecesssesecessessrstseeeneens 55
Hardware Nomenclature .........eeeeeeeeeeeeees 55
Automatic Shut-off Mechanism
When threading the tape, the shut-off lever is
held by the threaded tape in operating position.
If tape runs out or breaks, the shut-off lever swings
outward and activates the automatic shut-off mecha-
nism. As a result, the function selector knob can
return to the STOP position without setting it
manually.
Note: When threading the tape, make certain that there
is no slack in the threaded tape, otherwise the
function selector knob will not be set at the desired
2.
BLOCK
DIAGRAM
position.
Quy
Qm
Qua
Qua
Qos
ag
Tehet
AME
BIAS.
OSC
Mx
sey
ay
nee
a
A
ic
"
iF
:
V\\
EHX
\
MIG
Ss
i)
——
RH
Sias-e
I
en OX
H
ll
REC/PB
i
Connec'
Soa
©
LINE
OUT
—
LINE
AMP
—
Qho
On
ME
IE
—o5V]]
Heapprione
——
PLAYBACK
AMP
—
To
Toot
Q393
3
VOLTAGE
REGULATOR
="
as
AC
(NPUT
|
50,
B0Hz
Q304
O05

3. CABINET — TOP VIEW —
X-34720-38
panel assy, reel
X-34720-47
cabinet ass’y, slant ~
X-34720-21
reel table ass’y,
X-34720-22
take-up
ree! table ass‘y, supply ——
_X-34720-40
cover ass’y, head
3-472-252
escutcheon, jack
X-34720-41
knob ass’y,
function selector
3-472-264
knob, speed selector
1-514-655
Switch, power on/off
X-34720-39
panel ass’‘y, amp.
X-34720-42
knob ass’y, REC
”
level
control
1-507-282-1171
jack, headphone
X-34720-42
1-507-251-13 : 7 knob ass’'y, REC
jack, MIC level control
4. CABINET — SIDE VIEWS —
Left Side View Right Side View
1-507-142-13
jack, AUX IN
1-534-487-22 7
cord, power
@P4x10
terminal,
ground
3-4 72-405
label,
specification
bdo
connector,
1-509-064-13S
rec.
/p.b.
voltage selector
1-507-142-13
Jack, LINE OUT

3-472-149
idler (A), driving
-184 (50Hz)
$472_485 (60Hz)
motor pulley
Y-20410-12-7 |
counter, tape index
8-826-629-24
head, erase; EF 18-2902A
8-824-629-20
head, record; RP102-290.
171-514-641 |
switch, noise suppress
1-222-306
resistor, variable; 100k
1-524-062-12
VU meter
171-222-305
|
1-222-305
resistor, variable; 20k
6. CHASSIS — BOTTOM VIEW —
1-441-607 1-117-036
transformer,
power
capacitor,
MP
(1.5
+
O.5uF,
250V)
-11 (white)
1508-396 93 (yellow)
joint, terminal
1-533-006
holder, fuse
1-532-096-11__
fuse, 0.8A
X-34724-23-1
mounted circuit board,
power supply .
-11 (white)
109-367 94 (yellow)
joint, terminal
1-514-643
switch, muting
(S105, 205)
X-34724-22-1
1-518-093-21 mounted circuit
X-34724-24-1
i
mounted
circuit
:
board,
playback
amp.
lamp, pilot board, record amp.
3472-156
pulley, fast-forward
X-34720-03
flywheel ass‘y with
capstan shaft
8829-129-20
head, playback; PP102-2902
3-472-124
pinch roller
X-34720-02
deck ass’y, head
3-472-224
chassis, amp.
171-222-306
resistor, variable; 100kQ
resistor, variable; 20k
3-472-227
side plate (A),
amp. chassis
8-832-624-09
motor, 1C-624H1
1-514-644
switch, equalizer
(S101, 201, 302)
X-34724-21-1
mounted circuit
board, bias osc.

7. DISASSEMBLY
7-1. Reel Panel Removal
knob, instant stop g ®B 3x14
}
\
~
@
el
ee
Cover
ass’y,
head
se
>
S:
DNR,
®B 3x14 (black) |
ee
g | pin, head ¢
W 3 \
washer, jack insulating ZA]
knob ass‘y, REC
level control a
knob ass’y, function selector
vs
ye
Q ©8 3x14
W3¢
pring, function
selector knob
W3o
felt, level
control knob
cabinet ass’y, slant
7-2. Chassis and Bottom Cover Removal
chassis ass’y
i
@B 4x45
cabinet ass’y, slant
sher, cabinet
washer,
cabinet;
special
a me eae
washer, cabinet
washer, cabinet; special
bottom cover
(slant type) _
_- stopper, rubber foot
oe
foot,
rubber
§——
ep
4x25
CAUTION
(on cabinet reassembling)
(1) Be sure that the tab of the reel panel is inserted
in the hole of the amp. chassis as shown in Fig.
7-1.
(2) When attaching the cabinet to the chassis, be
certain that the reel tables, the jacks and the
switches are set correctly in the respective holes
of the reel panel, and then fix the four screws
alternately.
(3) When attaching the reel panel to the cabinet, it
is convenient to attach tentatively the two level
meters to reel panel with adhesive tape.
screw
®B 4x45
Ssw3
W3¢
chassis,
amp.
WP 3x6
Fig. 7-1 Reel panel removal
plate, instant stop
stroke adjusting
retainer, wire
WP 3x6—__.¢
CAUTION
(on repairing)
(1) Never put the machine upside-down on the hard
plate with the head cover removed, or the pin of
the tape shifter, the shut-off arm pin, the tension
arm and others shall be bent by the weight of the
machine.
If it is necessary to put the machine upside-down
put it on a soft cloth with the head cover
attached.
(2) Do not short-circuit B* circuit to ground, or the
transistor Q304 will be broken.
(3) When removing the instant stop knob, turn it
clock wise.
(4) Turn on the power switch after being certain that
the motor fan does not touch anything.
7-3. Head Deck Removal
| a
\
deck, head

-TC-366 TC-366
8. SCHEMATIC DIAGRAM
Qos 286870
Cra I é $302 /
3o~200? [7c i
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GND Riva. 27K Sere aT ~ EFIG-2902A
At Er a Rita 56K 10K C1s2 0.0022 a gm, (1.8KQ/I60KHz)
AUX & Gio Rigs . Y ee area aS TX Ena
INPUT TtooP /
-22dB
-
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(HOOKS) Qios 256871 Qi 286870 | Dioi 1722 ‘Nate
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¢
i
we
an
al
(1)
The
positions
of
the
switches
in
this
schematic
are
shown
5.8 820K : in the following table.
! : ; 5) J 103
ran i - eee ivR 5K(B) LINE OUT
Pe
Saas
ial
TR
&
.
,
fae
Cy
CK
:
call
sae
a
,
Switch
No.
Description
hee
nek
. .
,
I
$101,201,302
|
Equalizer
Switch
19
cm/s
PP102- 2902 if : | $102, 202 Monitor Switch Tape
4.5KQ/ VkHe) Riso Ol | $103, 203 Noise Suppress Switch OFF
. : P ; : : I S104, 204 Record Switch OFF
aes Rife $105, 205 Muting Switch OFF
76
OD
|
Rup
150K
506-3
CTT
S106,
206
Tape
Selector
Switch
Normal
O
CO
a
me
$301
Bias
ON/OFF
Switch
OFF
176 82K “o—o
7 A: a CE DE DOR REET. $303 Power Switch ON
N30 S304 Automatic Shut-off Switch
a 5 $305 Frequency Change Switch
S306 Bias Timing Switch
(2) Voltage values are measured with a voltmeter (20 kQ/V)
in playback mode. Voltage values in parentheses are for
record mode,
Voltage variations may be noted because of normal pro-
duction tolerances.
(3) The resistors marked @ are semi-fixed resistor.
(4) The letters (A) or (B) which is suffixed to resistance value
indicates its characteristics.
Q303 28D28
Q304 286870 3020-2 | tay
Raw 47 | 25-5.) Qg05 286870 rT ;
Le RDB
AUX
INPUT
«Raa
56K
___IBOK
an1280870 |
Rage | Raa | Crag, 0.0088
H10K__| 8.2K F Rage .3.3K
~~ Qan9286870 210286870
Y Rasp 220
rm
Rasa 10K?
~ 4
V7
Big 2902 Cag |
(4.5KS/Ikttz) 5 ae || {6
| 33
C235
0.0033
é
H
es
Rog
BS
fy
R247
2.2K
F
Pa
0.033
L_[!5ok
ae
Cad
1.§u*0-5u
@ 2 of 520-3

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rs)
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—
9. MOUNTING DIAGRAM
Record Amplifier Circuit Board
9-1.
Record Amplifier Circuit Board
9-1.
— Component Side —
— Conductor Side —
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10. LEVEL DIAGRAM
10-1. Record
OdB=0.775V, f= kHz
~bdB (0.38V)
dB
(7.75mV)
~bIdB
{0.775mV) (9695 nv)
-19-—W
Qior (201) = Q102(202) Qio3 (203) Qi04 (204) + Q105 (208)
ee
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NU
IS >
\
—— RH
10-2. Playback
OdB = 0.775V, f= 1kHz
0dB
(0.775V)
~15dB
(0.138V)
Qtos(20s) __ Q107(207) Gros (208) Q109 (209) oun Qa (an)
@
A LINE QUT
1 © ‘iooke
a NOISE
SUPPRESS
9 f] HEADPHONE
: cooly
®
22-]5 22

11. MECHANICAL ADJUSTMENT
In
case
the
parts
described
in
the
table
below
are
rdassembled
or
replaced,
the
following
adjustments
and
checks
are
necessary.
Adjusting or Checking Item
Tape Shifter Position Adjustment (See page 19)
Instant Stop Adjustment (See page 20)
Bias Timing Switch Check (See page 20)
Record Releasing Rod Adjustment (See page 23)
Head Deck
Capstan Idler Position Adjustment (See page 21)
Tape Speed Adjustment (See page 24)
Reel Table Height Adjustment (See page 21)
Reel Table e Take-up Back-tension Adjustment (See page 21)
FWD Torque Adjustment (See page 21)
ee :
Deiving
tdlet
FF
&
REW
Torque
Adjustments
(See
page
23)
FF & Driving Idler Height Adjustments (See page 23)
Tension
Regulator
Arm
Tension
Regulator
Adjustment
(See
page
17)
Tension Regulator Arm Tension Regulator Back-tension Adjustment
Felt (See page 18)
FF & Driving Idler Height Adjustments Gii8) FWD Torque Adjustment
Instant Stop | 1-19 FF & REW
/
7 Adjustment Torque
1-13) Reel Table Height 7 | Adjustments
Adjustment ~
G13» Tension Regulator Back- ~ =
tension Adjustment
G11 Take-up Back-tension
Adjustment
Reel Table Height Adjustment
i v, Z Ea isis ( - GID Brake Adjustment
A 4 i ; : 7 '
Gib poreh Reguiatoy Ss ; ; = man \ Bias Switch Position
Adjustment
~G41-22) Flywheel Brake Check
“G1-2d) Tape Speed Adjustment
Capstan Idler
Position Adjustment
Idler Arm (C) ~
Stroke Check
Record Releasing ~~ P é
( (41-4 Pinch Roller Stroke &
Rod Adjustment
—~——“" Height Adjustments
| Gr | " 11-5 ) Pinch Roller Pressure Check
;
:
1-6
|
Tape
Shifter
a
Scrape
Flutter
Filter
Roller
1
Position
:
;
ey
;
Check
Adjustment
Bias
Timing
Switch
Position Adjustment
Fig. 11-1 Adjusting parts location (1)
— 16 —

Pinch Roller Stroke & Height Adjustments
aI
11-2 ) Shut-off Mechanism Adjustment
Pinch Roller Pressure Check
Fig. 11-2. Adjusting parts location (2)
11-1. Tension Regulator Adjustment
— in STOP mode —
(1) Adjust the adjusting screw so that the clearance
shown is 8.5mm (114,") after having been turned
the reel table counterclockwise with hand.
(2) After the adjustment, apply lock paint to the
screw.
reel table, supply
screw, adjusting pin, tension regulator arm
arm, tension
regulator
©
guide, tape
locus drawn +~--->
a
fo) C7 head, erase
by the pin
movement 8.5mm
(4452")
Fig. 11-3 Tension regulator adjustment
—17—
pin, tension regulator
tape
-arm, tension regulator
Be sure that the tape comes in
contact with the tension regulator
arm pin uniformly at the begin-
ning and the end of the tape
as shown.
Fig. 11-4 Tension regulator adjustment
11-2. Shut-off Mechanism Adjustment
— in STOP mode —
(1) Loosen the two screws A and adjust by posi-
tioning the shut-off lever holding plate as’y so
that the shut-off mechanism is locked whei the
clearance between the shut-off arm and thehead
deck is 6mm (1544"'), and the shut-off m:cha-
nism is released completely when it is | mm
(/ea"’ ).
(2) Adjust the screw B so that the cleaance
between the shut-off levers (B) and (H) is
0.3~0.6mm (444’) in STOP mode.
(3) After the adjustment, apply lock paint t» the
screws.

deck, head
(back view)
1mm (%a") arm, shut-off
lever
(H),
shut-off
screw
A,
adjusting
screw B , adjusting
lever (B),
shut-off
plate ass’y, shut-off
lever holding
shut-off mechanism
ye
release
~~
lock
Fig.
11-5
Shut-off
mechanism
adjustment
11-3. Tension Regulator Back-tension Adjustment
In FWD & FF modes
use a 7"' tape
in FWD mode .........-
Bae ~559
(1.586 ~ 1.940 oz)
in FF mode ..........0
wi 15 ~20 9
(0.53 ~0.71 oz)
stud
spring
/
Adjust by
changing |
the position
Fig.
11-6
Tension
regulator
back-tension
adjustment
pin, tension regulator arm
(1) Make the tension regulator adjustment.
(2) Adjust by changing the hooking position of the
spring to obtain the specified values on the
tension gauge at the beginning and the end of
the tape as shown in Fig. 11-6.
If it is not obtained the specified values, adjust
by bending the stud or perform the tension
regulator adjustment.
11-4. Pinch Roller Stroke & Height Adjustments
(1) Remove the head deck (See page 6).
(2)
Adjust
the
screw
@
so
that
the
pinch
roller
shaft
comes
in
contact
with
the
retractive
lever
at
the
position
(A)
shown
in
Fig.
11-8,
in
STOP
mode.
(3) Fix the screw @) while pushing the joint lever
in the direction shown with arrow in Fig. 11-7.
(4) Put the dummy capstan x into the capstan bear-
ing and be sure that the pinch roller shaft moves
by
approx.
3~4mm
(14
~5/2")
on
the
surface
of the retractive lever when the function selector
knob is changed from STOP to FWD.
(S) Be sure that the washer for the pinch roller shaft
does not come in contact with the part indicated
with 4 on the retractive lever when the function
selector knob is changed slowly from FWD to
FF,
(6) After the adjustment, apply lock paint to the
screw.
screw (1), adjusting
lever, joint
lever, retractive
head deck — back view —
Fig. 11-7 Pinch roller stroke adjustment
—18—

shaft, pinch roller
lever, retractive
: 3~4mm (1h ~5/2")
Fig. 11-8 Pinch roller stroke adjustment
(7)
Loosen
the
pinch
roller
height
adjusting
screw
shown
in
Fig.
12-1
and
adjust
by
moving
the
shaft
upwards
or
downwards
to
obtain
the
values
specified
in
Fig.
11-9.
pinch roller
+
in FWD mode
22mm £0.46mm
(5564")
in STOP mode 7
less than 13mm (33/6q'')
'
1
Fig.
11-9
Pinch
roller
height
adjustment
* Dummy Capstan
As
the
pinch
roller
stroke
adjustment
and
the
pinch
roller
pressure
check
require
the
dummy
capstan,
make
it
as
follows;
Prepare a flywheel ass’y (for TC-366) and remove the
capstan shaft (dummy capstan) from the flywheel ass’y by
patting the head of the capstan shaft with the hammer,
taking care not to bend the shaft. Flywheel Ass’y
Part No.: X-34720-03
11-5. Pinch Roller Pressure Check
— in STOP mode —
(1)
Put
the
dummy
capstan
x
into
the
capstan
bearing
and
be
sure
that
the
clearance
between
the
pinch
levers
(A)
and
(B)
is
approx.
0.5mm
(164).
pinch lever (B)
dummy capstan
pinch lever {A}
lever, retractive
head deck — back view —
Fig. 11-10 Pinch roller pressure check
= ee
Be sure that the tension gauge indicates 800 ~ 1,000 g
(1 lb 12 0z~21b 3 .0z) when the pinch roller is
detached from the capstan in FWD mode.
800 ~ 1,000 g
{1 lb 120z~2Ib 3oz)
Fig. 11-11 Pinch roller pressure check
11-6. Tape Shifter Position Adjustment
— in STOP mode —
head, record
Adjust by positioning the lug.
Fig. 11-12 Tape shifter position adjustment
11-7. Speed Selector Cam Position Adjustment
— in FWD mode —
Adjust
the
screw
to
locate
the
idler
arm
(c)
pin
at
the
center
position
between
the
two
stopper
slots
shown,
at
19cm/s
tape
speed.
cabinet.
switch
equalizer
screw, adjusting
slot, stopper pin, idler arm (c)
Fig.
11-13
Speed
selector
cam
position
adjustment

11-8.
Instant Stop Adjustment
— in STOP mode —
leaf spring, instant
ZAR
a Ss
3mm (%")
lever, instant stop
(1) Be sure that the tension regulator adjustment has
been made.
(2) Adjust the screw@ so that the distance between
the top of the instant stop pull rod and the
instant stop stroke adjusting plate is 4~5Smm
(*42 ~ 3/6") in STOP mode.
(3) Be sure that the clearance between the pinch
roller and the capstan is more than 1 mm(344")
when pulling the instant stop lever in FWD mode,
and the instant stop knob is not locked when
pulling it in STOP mode.
(4) Adjust the screw so that the clearance
between the tension regulator arm and the
instant stop leaf spring is 3 mm(14”) in STOP
mode.
(5) After the adjustment, apply lock paint to the
SCIeEWS.
11-9. Bias Switch Position Adjustment
(1) Loosen the two screws and adjust by positioning
the switch.
(2) Be sure that the switch is in ON position in
FWD mode, and when the function selector
knob is changed slowly from FWD to STOP,
the record knob is released after the switch is
in OFF.
in STOP mode
in FWD mode
switch, bias
(S301)
Fig. 11-15 Bias switch position adjustment
screw (8), adjusting
4~5mm (342 ~ ay
=i
pull rod, instant stop
screw @ adjusting
@
if
plate, instant stop stroke adjusting
arm, tension regulator
Fig. 11-14
Instant stop adjustment
11-10. Bias Timing Switch Position Adjustment
— in FWD mode —
Loosen the two screws and adjust by positioning
the switch.
in modes except FWD mode: 0.5~ 0.7 mm (\ea")
in FWD mode: To contact sufficiently
deck, head
PPS LLL SL Lf ff
rod, record releasing
meter, VU switch, bias timing
(S305)
Fig.
11-16
Bias
timing
switch
position
adjustment
11-11. Idler Arm (C) Stroke Check
— in FWD mode at 4.8cm/s (1% ips) tape speed —
with 50 Hz use: more than 0.6mm (1/64")
with 60 Hz use: some Clearance
idler, capstan
Fig.
11-17
Idler
arm
(C)
stroke
check
— 20 —

11-12. Capstan Idler Position Adjustment
— in FWD mode —
4.8 cm/s (17, ips)
to be flush
9.5cem/s (33/,ips)
:
arse
eee
“
19cm/s
To
be
some
clearance
(7/
ips)
7 idler, capstan
pulley, motor
To contact at
the center.
motor
7mm (3%4")
Adjust the height ,
of the idler by loosening
the screw.
Fig. 11-18 Capstan idler position adjustment
After the adjustment, be sure that the capstan idler does
not come in contact with the flywheel and the motor pulley
in STOP mode with 60Hz use and the clearance between
the capstan idler and the motor pulley is more than 3 mm
(14") in STOP mode with 50 Hz use.
11-13. Reel Table Height Adjustment
— in FWD, REW & FF modes —
(1) Adjust the height of the reel table by loosening
the screw so that the tape does not come in
contact with the reel in FWD, REW & FF modes.
(2) Perform the back-tension and torque adjust-
ments.
(3) After the adjustment, apply lock paint to the
screw.
approx.35mm
(134)
-— ee
screw, adjusting
Fig. 11-19 Reel table height adjustment
— 21
11-14. Take-up Back-tension Adjustment
— in REW mode —
@ Adjust by turning the screw.
©
O
5G)
O
1 | in REW mode
| 70 ~80g-cm (0.974 ~ 4.11 02-inch)
Fig. 11-20 Take-up back-tension adjustment
After the adjustment, perform the FWD torque
adjustment and apply lock paint to the screw.
11-15. FWD Torque Adjustment
— in FWD mode —
Adjust the FWD torque by
turning the screw.
reel
200~ 240 g.cm
(2.8~3.3 oz-inch)
7
torque meter
Fig. 11-21 FWD torque adjustment
After the adjustment, check the take-up back-tension torque
and apply lock paint to the screw.
11-16. Scrape Flutter Filter Roller Check
— in FWD mode at 4.8cm/s (1% ips) tape speed —
To contact with the tape sufficiently
roller, scrape flutter filter |
Fig. 11-22 Scrape flutter filter roller check

11-17. Brake Adjustment
— in STOP mode —
supply brake direction A
torque he cot se saste le
direction B
500~750 g.cm
(6.96~10.4 oz.inch) take-up brake direction C
x torque
1,000~1,800 g.cm
(13.9~25 oz.inch)
400 ~550 g.cm
(5.56~7.65 oz.inch)
Beni
1,600
~
2,200
g.cm
direction
D
(22.
2~30.6
orn
reel table, supply
Adjust the supply brake torque by
expanding or contracting the gap
of the spring.
\e
8.5mm (1142") /
in STOP mode
After having performed the tension
regulator adjustment,
supply brake torque adjustment.
11-18. Tape Slack Check
Place the machine in vertical position
and thread the tape with 7"' reel.
7" reel
FF
STOP
7" reel
FWD (4.8cm/s}
|
STOP
Fig. 11-24 Tape slack check
(Fig. C)}
2) take-up brake
adjustment in the
direction shown
reel table, take-up with C
Ragin } strong
gw sey. See
| weak
@ Adjust by bending
the lever.
p
lever
(A),
S
f
brake
4)
Adjust
by
turning
the
-
spring
screw
so
that
the
distance
shown
with
is
3~4mm
Y
(h~4ho").
After the adjustment, ap-
lever
ply
lock
paint
to
the
screw.
3) take-up brake torque adjustment in
the direction shown with D
@ When the meter reading is more than
the specified value, bend the lever
in the direction shown with arrow.
@ When the meter reading is less than the
specified value, cut off one turn of
the spring end and hook the spring.
Fig. 11-23 Brake adjustment
(1) When changing the function selector knob slowly
from REW to STOP at the end of the tape, be
sure not to slack the tape (See Fig. A).
(2) When changing the function selector knob from
FF to STOP at the beginning of the tape, be
sure not to slack the tape (See Fig. B).
(3) When pulling the instant stop knob in FWD
mode at the beginning of the tape, be sure not
to slack the tape.
(4) When changing the function selector knob from
FWD to STOP at the beginning of the tape at
the 4.8cm/s (1% ips) tape speed, be sure not to
slack the tape (See Fig. C).
2 99.

11-19. FF & REW Torque Adjustments
— in FF &R EW modes —
Adjust the position of the leaf spring to obtain the specified values
on the torque meter.
(Read the values when the driving idler is forced to stop the
motion.)
idler, FF
spring, leaf
idler, driving
y x in FF mode
in REW mode \ i 1,000 ~ 1,4009:cm
1,000 ~ 1,400g-cm a (14 ~ 18 oz-inch)
(14 ~ 18 02-inch)
Fig. 11-25 FF & REW torque adjustments
11-20. FF & Driving Idler Height Adjustments
— in STOP mode —
reel table,
supply
Adjust the heigh
Fig. 11-26
nylon washer
reel table, Part No. thickness
take-up
3-425-197-01 0.13mm
3-425-197-11
3-425-197-21
© washer, nylon
t of the idler by adding or removing the nylon washer.
FF & driving idler height adjustments
11-21.
Record
Releasing
Rod
Adjustment
—
in
STOP
mode
—
rod, record releasing
: na Part No. L (length)
05~ 1mm (Yea ~ 364")
{ rod, record fever lock
3-472-240-02 150mm
3-472-240-11 150.5mm
rod, record releasing
deck, head
3-472-240-21
lever {D), record
Be
sure
that
the
clearance
between
the
record
lever
lock
rod
and
the
record
lever
(D)
is
0.5
~
1mm
(1%4
~
364").
If not, replace the record releasing rod or bend the record
lever (D).
Fig. 11-27 Record releasing rod adjustment
|
|
=

11-22. Flywheel Brake Check
— in REW mode —
Be sure that the flywheel brake comes
in contact with the flywheel.
fly wheel
Fig. 11-28 Flywheel brake check
11-23. Tape Speed Adjustment
(1) Playback the SONY speed check tape (SPC-47) at 19 cm/s
(741A ips) tape speed in horizontal position.
(2) If the counter reading is out of 3,960~4,040 Hz, replace with
the motor pulley with identifying mark shown below.
(As for Part No. of the motor pulley, refer to page 40.)
deviation -3% -2% -1% iy +1% +2% 43%
frequency 3980 4020
on
counter
3880 3920
3960
4000
4040 4080
47120"
4160
IN
Fos
FED,
oS.
oe
Ae
4
identifying mark +3 +2 +1 40.5 0 -0.5 -7 -2 -3
on motor pulley
SONY speed check tape SPC-47
no signal 4kHz ye 0 signal
4min ~ > 25min. 26 min.
Fig.
11-29
Tape
speed
adjustment
Standard
19cm/s(7 14 ips) | 9.Scm/s(334 ips) | 4.8cm/s(17% ips)
Deviation (%) £1.5
Variation
1
Limit
(%)
— 24 —