Dokorder 7700 Service Manual
DOKORDER
SERVICE
sM,
1977.3
MANUAL
1004-00
rnoder 77OO
TECHNICAL
DESCRIPTION
PROCEDURES
AND
sEcroN
ADJUSTMENT
1
D
bokorder,
5430 ROSECRANS AVENUE, I-{WNDALE, CALIF.
r-rE\]
26.1 1, 3-CHON4E,
<)\JK-YO CO.,
Kr
NISHI-ROKUGO, OTA-KU,
lnc.
90260
r--trE).
TOKYO,
U.S.A.
JAPAN
TABLE
OF CONTENTS
1. GENERAL
1 1
Amplifier
1-2 Tape
Power
1-3
2. SERVICE
DESCRIPTION
Circuitry
Transport
Supply Circuitry
Mechanism
DATA
1
2
21 Mechanical
Electrical
2-2
PARTS
3.
3-1 Outer Parts
3-2 lnner Parts
4. REMOVAL
4-1 Front
4-2
4-3 Top
5. ADJUSTMENT
5-1
5-2
5-3 Reel
5-4 Brake Mechanism
5-5 Tape
5-6 Wow/Flutter g
6. ADJUSTMENT
6-1
6-2 Adjustment Procedures
7. MAINTENANCE
-1
7
7-2 Lubrication
7
3
B. TECHNICAL
8-1 Solenoid
8-2 Capstan Drive
9. SCHEMATIC
LOCATION
OF
OUTER
Panel
Panel
Amp
and Bottom Boards
PARTS
-MECHANTCAL-
Auto
Pinch
Shut-off
Roller
Motor
Speed
Switch
Drive Mechanism
Torques
-ELECTRTCAL-
Adjustable
Parts Location
.
Cleaning
Demagnetizing
DESCRIPTION
Drive Circuit
Circuit
DIAG RAM
.
3-4
...
.
6-'11
.12-20
21
....22-31
5
g
../
y)
Note
This Service Manual
Section 1:
Section 2: Exploded
Section 3:
Descriptions
and
Patterns,
consists of three
circuitry,
of
maintenance,
views, and
schematics and
plus
sections:
operating
technical
parts
list.
parts
data.
lists
procedures,
printed
for
and methods of adjustments
Circuit
boards.
v
1.
GENERAL
DESCRIPTION
The Dokorder
noid operation
1.1
AMPLIFIER
1.
The convenience
phone
AMP Circuit
2. 4-separate
3' 2-stepped
position
the
1-2 TAPE
TRANSPORT
Model
7700 is
facility. Designed
CIRCUITRY
features
and Level Meter
of the
Equalizer
Normal
Special
permit
Switch
switch
(button
(button
MECHANISM
controls
Equalizer
-track,2-channel,2-speed
a
for high dependability
7700's
of the
subtle input/output
is equipped
is illustrated
Switch
out)
in)
amplifier
AMP
to
below.
Circuit
level
use for
tape deck
and electrical
circuit
such
built
in.
adjustments.
the several
equipped
performance.
as the Monitor
type
of tapes.
Scotch
Maxell
#212
#UD-35
with 3-motor,
Their
Switch. Mic
The relation
Type of
Tape
or equivalents
or equivalents
features:
AMp
between
3-heacl
and sole-
Circuit, Head-
the
tapes
and
1. The convenience
trol,
tape
travel
counter are
2. fhe tape transport
ward, rewind,
mode.
High
3.
dependability
powerconsumption
4. Especially high
(Phase-Locked
PLL
5. Newly designed
1-3 POWER
1.
2.
primary
The
the
reel motor
mode.
the secondary
On
illuminating
circuit
and capstan
play
speecl-accuracy
high-torque
SUPPLY CIRCUITRY
winding of the
drive in the fast winding mode.
pilot
the
features
offers
or record).
proven
is
and heat up in the solenoid
Loop)
7700's
of the
positive,
Auto Stop convenience,
an
solenoid
a
and the
by using newly
surprising
and
System in capstan
Servo
outer-rotor eddy-current
power
transformer
the
side,
motor.
transformer also offers
lamps, while the
latter
tape
transport such as
mechanisms themselves
and
releases the
locked
improved
and its control transistors.
wow/fluttel
motor drive.
motor is used
provided
is
while
the
two windinqs for
rectified
is
and then
the all-electronic operation buttons,
(s)
to
dependable.
end in
any mode
place
the deck
are rugged and
when
the tape reaches its
operating
control
electronic solenoid control system that
characteristics
are realized
by using
most advanced
for reel drive.
two
latter
100 V
taps
is used for the reel motor
5.6 V and 14 V x 2. The
to
used
54 V. The
and
power
the amplifiers, solenoid, PLL
former is used
drive in the
former is used
pause
con-
(fast
in the stop
reduces
rec/play
for-
the
for
for
2. SERVICE
DATA
2-1 MECHANICAL
Record/Playback System
Tape Width
Reel
Size
Motor
Head
Tape
Speed
Wow and
Fast
Motor
Brake Torque
Flutter
Winding
Torque
Time
weight
Dimension
2-2 ELECTRICAL
Equalization
Frequency
Bias
)
ll
)
to Noise
Separation
Leakage
Ef{iciency
Response
Response
Recording
Ratio
(Overall)
Mic
L ine
DIN
Line
DIN
Frequency
(Playback
Frequency
(Overa
One-channel
Signal
Crosstalk
Channel
Bias
Erase
Distortion
Meter Calibration
lnput
Output
Headphone
Circuit Complement
Power Consumption
Power Requirement
4 track 2 channel stereophonic
Standard
7-inch or smaller
Three
outer-rotor
Three
!1
Playback
0.13o/oat
100 sec
Hold-back
Take-up torque
FFlREW
600 - 800
35
17-314"
NAB
130 KHz
.19
50
o
9.5
50
o
Normal
Special
o
9.5 cm/sec
Normal
Special
TOOHzll
500
Better
Better
Better than
Better
Less than
Better
Less than
0 dB
-58
-20
30
OdB
260
2mW
34 transistors,
75W
U.S.A.
Universal
1/4 inch tape
(one
(1
erase, 1 rbcord, 1
19
.5o/oat
(RMS)
19 cm/sec
for 7-inch reel
tention
hold-back
lbs
(H)
+1
cm/sec
Hz
100
-
cm/sec
7.5 KHz
Hz
-
1
cm/sec
9
30
30
35
35
11
Hz
than 50 dB
than
than
-25
than 65
3% at
IOOHz
at
10 KO
dB
220 K9
dB
mV 80
47KQ
mV 47 KS)
type
type
for
cm/sec
PLL
DC servomotor
reels)
playback)
(7-1
l2ipsl
(7
112ipsl
(1800-foot
2 speed
type
(playback)
(playback)
tention
(1.8
gr
X 16-718"
KHz
(7
l12ipsl
l!
oa,
(3
3/4
(1-1
Hz
-
Hz
-
(3-3/4
Hz- 12KHz
Hz
-
15 KHz+5dB
dB,
dB, 7.5
46 dB
50 dB at
40 dB at 1 KHz
dB
dB at
1
0
KQ
8Q
29 diodes,
117 V
100 V,117V,125V,20OV,220V,24O
kg.cm)
2.4
-
(W)
Hz
1o1
ips)
13
dB
ips)
12
KHz
20
20 KHz
ips)
12 KHz
+5
KHz
(Playback)
(Overall)
1 KHz
1 KHz
KHz
dB
0
dB output
(load
imPedance)
5
(60
Hz)
X 6 3/4"
t3
13
t3dB
13
dB at 9.5 cm/sec
.5%at
,!1
tape, 60
85
150
30
(30
(50
(35
(35
gr 110 gr
gr
gr
at 9.5 cm/sec
(450
(
(D)
13
100
-
100
-
-'1
100
-
,0.20%
1 5 KHz
-
dB
dB
dB
at 19 cm/sec
at 0 dB output
(P.8.
FET
output
level
VR-Max)
,2
at 0 dB
output
level
lC,2
for capstan, two 6
(3
9.5 cm/sec
Hz)
(255 t30 g.cm)
g.cm)
g.cm)
90
dB
Hz, 15
Hz, 15
Hz, 1.5- 12
00
Hz,
(7'1
(3-314
level
level
1
LED,
3/4 ips)
(3-3/4
20
-
20 KHz
-
7.5 - 12
/2ipsl
ips)
PUT
KHz
pole
ips)
t5
t5
KHz15
15
KHz
(50/60
V
induction
dB)
dB)
dB)
dB)
Hz)
al
v
Y/
V'
v
Specs
are subject
to
change
withor-rt
notice.
3.
PARTS LOCATION
OUTER
3-1
Push Button,
20
Push Button,
21
Operate
22
23 Ope.
24
25 Ope.
26 Level
Button,
Ope. Button, Stop
Button,
Meter
PARTS
Metal,
Red, Rec.
Button,
FF
Plav
(141-1004-00)
Front View
EO,
Speed,
SW
(556-0038-80)
Rec.
(556-0037-80)
REW
&
(556-0035-80)
(556-0036-80)
Monitor,
(556-0009-00)
Pause
(556-0013-83)
SW
Panel
Ass'y, Deck
1
Panel Ass'y, Amp
2
Board
3 Side
4 Top
Bottorn
5
Foot Ass'y
6
Head Cover
7
Counter
8
Turn
9
Dressing
1O
Pinch Roller
11
Tape
12
Tape Guide(R), Tension
13
Switch,
14
Switch.
15
Switch,
16
Switch,
17
18 Switch,
Push Button, Metal,
19
Control
27
Jack. Mic
28
Jack, Headphone
29
30 Cup
{551-0018-02)
(551-0013-90)
Board
(551-00'10-00)
Board
(880-0019-00)
{880-0016-00)
(143-31
Table Ass'y
Washer,
(523-0029-00)
Guide(L), Tension Arm
Push, Power
EO.
Push,
Push,2-station Speed
Push,
2-station,
Pause
Push,
Metal
Knob,
(135-5001-00)
(532-0021-00)
Washer
(880-0017-00)
(880-0018-00)
02-00)
(810-001
Pinch Roller
Arm
(131-1018-80)
(131-1014-00)
Select
Rec.
{131-1016-00)
Power
(556-0001-00)
{135-5002-00)
1-00)
(555-0050-02)
(558-0020-00)
(558-0021-00)
Monitor
&
(131-1017-00)
(556-0030-02)
SW
(131-1019-80)
or
(131-10i5-00)
fiililfi1
tiilltill
Back View
Back
60
AC Cord with
61
Holder,
62
Fuse,
Jack, 4-Pin
63
Terminal,
64
Socket,
65
Board
F
use
1.5
DIN
A
GND
(551-0019-03)
(162-1001-00)
Plug
1135-7001-00)
(138-1003-00)
(1
35-5008-00)
(135-1001-00)
(136-6003-00)
(551-0020-00)
or
3.2
INNER PARTS
Front
View
31
Solenoid,
32 Linkage, Brake
33
Stopper,
34 Linkage,
35 Bracket, Brake
36 Guide,
37
Spring,
38 Solenoid,
39
Spring,
40 Arm,
41 Arm,
42 Shaft,
Brake,
DC-24V 48
(525-0025-00)
Brake
Linkage
Brake
Solenoid
(533-0082-00)
Brake
Linkage
(541-0007-05)
Brake
Pinch
Roller
Pressure
Pinch Roller Drive
Pinch Roller
Pinch Roller
(541-0010-01
43 Arm, Auto Shut-Off
44 Switch,
45 Bearing,
46 Dressing
4-l Head Base
48 PC Board
49 Tension
50
51
52
53
54
55
56 Switch
57 Chassis(A),
Micro,
Capstan
Plate,
Ass'y
Ass'y
Arm Ass'y
Arm Ass'y
Tension
Motor,
Pulley,
Belt, Capstan
Belt, Counter
PC Board
PC Board
Ass'y
Ass'y
Ass'y, Operate
Amp.
Auto Shut-Of
1522-OO1O-O2)
Tape Lifter
(830-001
(PCM-365A),
No.3
Drive
Drive
(PCM-3978),
(PCM-3954),
(512-001
(1
ohm
1 6-2002-00)
(528-0008-00)
(525-0027-00)
(528-0009-00)
Pressure,
(525-0032-00)
(521-0025-05)
(525-OO24-O4\
(Left)
DC-24V
)
(525-0029-00)
(131-3001-00)
f
(521-0029-00)
1-00)
Head
Connect
1840-0016-00)
(Right) (840-0018-00)
(523-0031-04)
1524-OoO7-O2l
(524-0006-00)
Rec. & Pause
(821-0019-00)
LED
(820-0016-00)
1-83)
15 ohm
(1
(831-0004-00)
(821'0020
1 6-2003-00)
00)
**-
'**
Power Transformer
66
Resistor,
67
Resistor,
Resistor, Wirewound, 200
68
Resistor,
Motor,
69
Motor, Capstan
70
PC Board
71
PC Board Ass'y
72
PC Board Ass'y
73
PC Board Ass'y
74
Arm,
75
Flywheel
76
PC Board Ass'y
77
PC Board Ass'y
78
79 Chassis(A),
Chassis
Chassis(B),
80
Wirewound,
Wirewound,
Wirewound, 150
(113-1002-00)
Reel
Flywheel
(114-5001-00)
(PCM-4118),
Ass'y
(PCM-361C),
(PCM-417C),
(PCM-4138),
Support
{523-0030-01 )
(PCM416E),
(PCM4464),
Power
(B),
Power
Amp.
(1
1 1-1021-00)
1200 ohm
600 ohm
(533-0020-02)
Supply
Supply
(512-00'l
20W
15 W
10 W
ohm
W
10
ohm
Capstan
Capacitor,
Control
Bias OSC
Operate SW
Amp.
(533-0048'01)
(533-0049-00)
2-00)
1871-0012-00)
\3O2-122O-8O)
{302-6018-90)
{302-2018-90)
(302-1518-90)
(861-0003-00)
Motor
Reel Motor
(161-1034-00
(851-0008-00)
(851-0009-00)
(821-0021-O0)
)
4.1 FRONT P
4. REMO\/AL
OF
OUTER
PARTS
Referring
1.
remove
and
counterclockwise
Holding
2.
pinch
wise screw
washer
@
the dressing
anO
@
h
s
aft.
NOTE:
Remove
3.
front
then
arrow
NOTE:
When
care
panel
remove the
the illustration
in
When mounting the
the steps
two screws
the front
pliers
with
@
securing
Then
roller
lose
to
@
turning
panel
described
@
securing
panel.
washer
withdraw
posts
or
stitl,
pinch
extract
from the
the
nYlon washer.
the
anA
them
itself
shows.
should
Also,
Fig. 4-1.
to
head cover
roller
@
withdraw the
and
washer.
pinch
the
extracting
not
four
screws
by
washer
cup
rubber
tive
on the screw securing
head cover
turning them
by
@
box driver.
counterclock-
turn
roller dressing
screw together
nylon
pinch
pinch
roller,
securing the
@
counterclockwise;
moving it as the
by
panel,
front
Take note that
above.
fitted on the
be
bottom
the
note that
shoutO
@
right side of the
the
O
with
washer
roller
take
reverse
part
conduc-
f itted
be
of
front
(e)
aI
F-a
Fig.4-1
panel.
This is
grounding
for
the
front
panel.
AMP
4-2
Withdraw
1.
Remove
2.
clockwise.
NOTE:
When
3.
NOTE:
TOP
4.3
Remove
1.
To remove
2.
them
With the
3.
turning
4. When
those
PANEL
control
the two
Take care
meters.
mounting the
knobs-RECORD
screws
remove the
Then,
not
amp
Fit and tighten
fitted in the
panel
holes. Take
right
upper
the
AND BOTTOM
black-painted
the six
botrom
the
counterclockwise.
FOOT ASS,YS
it counterclockwise,
the
top and
bottom
mounting the
securing
(BS-3
four screws
to lose
panel,
screws
the
holes on
note that
of the
side
BOARDS
screws
board,
remove
Then
dismounted,
then
bottom
board;
LEVEL CONTROLS
above and
X 6)
(BS-4
washer
nylon
the
reverse the
steps
only after
panel
amp
the
conductive
the
panel
amp
(RS-3
X
four screws
remove
the
FOOT ASS'YS
the
remove
remove the
boards, take
different
are
they
(BS-3
X
that
15)
when'removing
described
checking
that
and
(see
4-1. 3 above)'
that secure
6)
screw
the
bottom
care
in size
PLAYBACK LEVEL
and
X
below the
18)
secure
above'
to see that
level
the
washer
rubber
the top
X
{RS-3
board
i4)
themselves'
(RS-3
X
itself'
not to confuse
finish.
and
amp
the
the
meters
should be
board.
securing
securing
8)
two
the
level
panel.
record
are also
the
meters
screws
indicator
fitted correctly
fitted
the two
bottom
the
securing
screws
CONTROLS.
by
turning
above and
on the
FOOT ASS'YS
below
LEDs are
screw that
board
the top
them
at its
counter-
the
correctly
the amp
in
secures
turning
by
center
board
level
by
with
3-2
INNER
PARTS
Front View
31 Solenoid,
Linkage,
32
33 Stopper,
Linkage,
34
Bracket,
35
Brake
Guide,
36
Solenoid,
Pinch
Pinch
Pinch
Auto
Arm,
Switch,
Brake
Pressure
37 Spring,
38
39 Spring,
40 Arm,
41 Arm,
42 ShaIt,
43
44
45 Bearing,
Dressing
46
4-l Head
48
49
50
51
52
53
54
55
Base
PC Board
Tension
Tension
Pulley,
Capstan
Belt,
Counter
Belt,
Board
PC
Board
PC
56 Switch
57 Chassis(A).
DC-24V
Brake,
(525-0025-00)
Brake
Brake Linkage
Brake Solenoid
(533-0082-00)
Brake
Linkage
(541-0007-05)
Pinch Roller
(528-0008-00)
(528-0009-00)
Pressure,
(541-0010-01
Roller Drive
(525-0032-00)
Roller
(521-0025-05)
Roller
Shut-Off 825-OO24-O4)
Auto Shut-Off
Micro,
Capstan
Arm
Arm
Motor,
Ass'y,
\522-OO1O-O2)
Plate, Tape
Ass'Y
Ass'y
Ass'y
Ass'v
Amp.
Lifter
(830-001
(PCM-365A),
(Left)
Ass'v
(Right)
Ass'y
(523-0031-04)
No.3
Drive
1524-OOO7-O2)
Drive
{524-0006-00)
(PCM-3978),
{PCM-395,4),
Operate {820-0016-00)
(512-0011-83)
(1
48 ohm
(525-0027-00)
1 6-2002-00)
DC-24V
)
(525-0029-00)
(131-3001-00)
(521-0029-00)
1-00)
Connect
Head
(840-0016-00)
(840
0018'00)
&
Rec.
(821-00i9-00)
LED
15 ohm
Pause
(1
1 6-2003-00)
(831-0004-00)
(821-0020-00)
v
?.'-
v
View
Back
ffiir:t:rj':::.. : :-
*T*-
:'. .:.:ii.::':::l:;.=?:@
-:;..
Q9(B)
*-l
€re1
I
I
u-
Transformer
Power
66
Resistor.
67
Resistor,
Resistor,
68
Resistor.
Reel
Motor,
69
70
71
72
73
74
75
76
77
78
CaPstan
Motor,
PC Board
PC Board
PC Board
PC Board
Flywheel Support
Arm,
Flywheel
PC Boarcl
PC Board
79 Chassis(A),
(B),
Chassis
(B),
chassis
8o
(1
Wirewound,
Wirewound,
Wlrewound,
Wirewound,
1 3-1 002-00)
{1
(1
14-5001'00)
(PCM-4118),
Ass'y
(PCM-361C),
Ass'y
(PCM'417C),
Ass'y
Ass'v
{PCM-4138),
(523-0030-0
(PCM-416E),
Ass'y
(PCM-446Ai,
Ass'v
Power
Supplv
Power
Supplv
(512-0012-oo)
AmP.
1-00)
1 1-102
20
ohm
1200
600 ohm
200 ohm
150 ohm
15
10
10
Capstan
Capacitor,
Control {851-0008-00)
Bias
(533-0020-02)
i
)
Operate
Amp
(533-0048-01)
(533-0049-00)
W
\3O2-122O-8OI
(302-6018-90)
W
(302-2018-90)
W
(302-1518-90)
W
Motor
Reel
(851-0009-00)
OSC
(821-0021-00)
SW
{871-0012-00)
(861-0003-00)
Motor
(161-1034-00)
u,
5.1
AUTO SHUT.OFF
a.
Specification
When the
auto shut-off
the microswitch
point
of more than
the
tape travel
off)
outside
b.
Adjustment
Adjust
point
at the
of the
the mounting
@
Reference
c.
Refer
d.
Special Tools and/or
N one
to
Fig.5
e. Preparation
Remove
the head cover
f. Procedure
(1)
Check
the on/off
(2)
lf
the on/off
mount
screws
g.
Note
(1)
Replace the dismounted
in
front
the
(2)
Load
the
completely by
off the tape travel
5. ADJUSTMENT
SWITCH
pushed
is
@
lswitches
(0.32
clicks again
on)
inch) outside
(0.56
of the microswitch
page
2 on
parts
deck in
M-12.
required
panel.
of the microswitch
check
and
play
in FF
upward,
at the
of
(switches
inch)
by
the spec,
again
contact with head
mode
and check
REW
or
mode,
@
8
position
of more
tape travel
1
or section
lnstruments
position
position
@.
panel
and does not come into
tape
and set
setting
urrn
clicks
mm
and
than 14 mm
position.
position
and front
does not meet
the
the deck
automatically at the tape end.
-MEGHANICAL-
lvlount(auto shur-011 swirch2Tape
\^@r/
61
;*
(up"cu,a"
Travet Posrtion
qls
gently
moving
adjust the
that the auto shut-off
if the
checking that
the auto shut-off
position
cover.
tape
of the
travels
the
microswitch
moves freely
arm
normally.
auto
shut-off arm returns
=
Dressing Plate
arm by hand.
by loosening
through
Then
take
up
two
hole
the
the tape
shut
to
a
z
?,
5.2 PINCH
2.1
STROKE ADJUSTN/IENT
ROLLER
a. Specification
Stroke of
plunger
b. Adjustment
Adjust
the stroke adjusting nut
c. Reference
Refer to Fig.5-2
d.
Special
A open end wrench
e. Preparation
Remove
head
Fix
sticking tape.
Procedure
f.
(1)
(2)
g.
Note
(i
(2)
Tools
and/or lnstruments required
front
the
cover).
the auto shut-off
Push
it
Adjust
(0.16
Loosen
)
After
play
the
pulls
and returns.
nut
the
0.18 inch).
-
lock
the
the stroke has been
DRIVE MECHANISM
THE
OF
4
4.5 mm
-
(0.16
@.
or section 2
(4
mm).
panel (including
arm ON by a
and
stop
ro that the
@
nut
@
page
on
buttons alternately
first
adjusted.
PINCH
0.18
-
M-20.
pinch
roller and
operating
and then
fix
inch).
piece
proceed
the
ROLLER
of
several
stroke of
with
nut
@
PRESSURE
Fis.5-2
mark the
times,
plunger
the
f-(2).
step
with
the
@Pressure
position
(indicated
lock nut
SOLENOID
@roct<
Solenoid
of
ur
tt.'.n
@,
Pinch
solenoid
the
is
)
@
paint-lock
lusting
Pressure Spring
Roller Drive Arm
plunger
from
4
to
it.
Nut
@
4.5 mm
a.
as
?
b
2-2
PINCH
ROLLER
a. Specification
tQ"l
1
ks
'5
Adlustment
b.
Adjust the
Reference
c.
Refer to
d. Special
A open
(4
Preparation
e.
Remove the front
and
Fix
stickinq tape.
Fig.
Tools andlor lnstruments
end wrench
kql'
head cover).
auto
the
f. Procedure
(1)
Read
balance
(2)
Adjust the
g
Note
(1)
(2)
(3)
precision
Use a
Loosen lock
Fix
the
PRESSURE
Pg
pressure
5-3
adjusting
or
section
panel
shut-off
pressure
the
when
the
pressing
spring
nut first before attempting
adjusting
nut
2 on
(4
mm) and spring
(including
arm ON
indicated
pinch
roller loses
force
balance
nut @ with the
@.
page
M-20.
required
pinch
by a
on the spring
contact
pinch
of the
with a scale of up
lock nut
balance
roller
piece
with the
roller by
step
of
f-(2).
@
Capstan
Fig.5-3
capstan and the
turning
the
4 kg
to
and then
graduated
Shaft
Capstan
Bearing
nut
@
paint-lock
and
in
pinch
@,
steps
it.
Pinch Roller
roller stops
if nec.ssaty.
of 50
\Pinch
g
or less.
Roller Arm
revolving
5-3 REEL
MOTOR
a. Speci{ication
Hold-back
Take-up
Adjustment
b.
Adjust the
the
Tension
Torque 150
wirewound resistor
hold-back
tension.
c. Reference
Refer to
d.
Special
A spring
(6
Preparation
e.
Remove the back and top
Fig.
5 4, 5-5 or section
Tools and/or
balance
cm in diameter).
(200
Fix the auto shut-off
ng taPe.
sticki
f. Procedure
Hold-back
f-i.
(1
Mount the 7-inch
)
with
in
(2)
Set
balance
tension
piece
a
Fig.
(A).
5-5
the deck in
gently
of string
the arrow in
indicated figures on the spring
(3)
Loosen lock screw
on the
O
position
balance indicates
f-2. Take-up torque
(1)
Mount
the slide
of
(Playback)
7-inch reel on the
the
TOROUES
+30
(255
110 gr
gr
85
(450
gr
lnstruments
(Playback)
play
in the
F ig.
g.
q)
7-inch small-hub
and
boards.
arm ON
reel on
attached to
mode and
direction
5
5
securing
@
cm)
(150
R-2
page
on
2
required
by a
left
the
pull
indicated
(A)
and read the
balance.
the slide ring
R-2 in Fig. 5-4 and
ring so that the spring
85
g 110
(255
9
right turntable with a
g.
cm)
for
ohm)
M-22.
reel
piece
turntable
it, as shown
the spring
adjust the
g.
130).
cm
by
ning
@stioe
Screw---
@Lock
lncrease{--
Fig.5-4
of
--->Decrease
"Moror
chasis
/^-\-i
\ t)---< )
\,fo
F ig.5-5
piece
of
string
attached to
,
q\
4.^/
\\\//
tlo \ /
\\ \ / /
\ L-/ ,,',
it. as shown
oo\.,"
Fig.
in
5-5
(B).
(2)
Set the
Fig.5-5
N ote
(1)
The hold-back tension
therefore,
(2)
When the
deck in
(B)
and check that the take-up
there is no
adjustment
play
mode and
both
in
need
has
adjust,
to
been completed,
pull
the spring balance
torque
the FF and
but do check
paint-lock
gently
is nearly 150
REW modes are
that the
hold-back tension
Iock t.t.*
the
in the direction
(450
g
g.cm).
determined
(E.
indicated by the arrow
fixed wire-wound resistor;
by a
g.
is 90
cm.
in
'!L
5.4
BRAKE
4 1 BRAKE
a. Specification
-
1.5
drum
mm
1
brake
b. Adjustment
Adjust the
R eferen ce
c-
Refer to
d.
Special
None
Pre
e.
Remove
and
F
sticking
f.
Proced u re
(1)
(2\
(3)
g.
Note
When the
Fig.5-6 or section 2 on
Tools
parati
on
the
head cover).
ix the
auto shut-off
tape.
Push
several
brake
Push the
space
(Moving
Keeping
brake
brake
adjustment
MECHANISM
BAND
(0.04
@
set
and/or lnstruments
the
times and
band
between rhe
the bracket
the tape
band
drum
0.06
-
and the brake
position
front
play
of the
panel
and
check the
(4).
play
button
deck in the
contacts the
@
anO the
@
has been
brake band
inch) space
band
@.
bracket
page
required
(including
ON by
arm
stop buttons
movement
once again
@
directin
in
the
stop
inside
band
brake
completed,
between
@.
M-16.
pinch
roller
piece
a
alternately
of the
loosen the two
and
and the
of arrow
mode,
of the
is also uniform.
@
paint-lock
the
of
brake drum
will
@
push
the
brake band
the two
@
t
+
@
Drum
@Brake
Fis.5
6
lock_screws
@
increases
linkage ()
brake
guide
lock screws
securing
@
will be from
the space
(5)
uniformly
@
the
1.5
1 to
@)
downward
and that
bracket
(0.04
mm
hand, check
by
the space
Brake'Linkage
@
to
@
0'06
-
between the
L
?
that the
inch).
that the
4-2 STROKE
a. Specification
plunger
Stroke
of
b. Adjustment
Adjust
c.
d.
Special
N one
Preparation
e.
and
sticking
the set
Reference
Refer to
Tools
Remove
head cover).
Fix the
Fig.5 7 or section
the
auto shut-off
tape.
f. Procedure
(1)
Push the
check the
and
(2)
Loosen
OF
position
and/or
front
play
two
BRAKE
1 - 1.5
of the
lnstruments
panel
arm
and stop
stroke of the
lock ,.r.*,
SOLENOID
(0.04
mm
brake
page
2 on
required
(including
ON
buttons
brake solen.id
and adjust
@
0.06
-
solenoid
M-16.
pinch
by a
alte
inch).
roller
piece
nately
the
O.
oi
plunger
position
F iq.5-7
@
of the
{indi"ut.O
solenoiO
@
Fig.5-7).
in
to that the
@
Screws
@Lock
operating stroke
L
L
o{
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