Sony TC-580 User manual

Power
Requirements:
Power
Consumption:
Track System:
Reel Size;
Tape Speed:
Recording Time:
(with 1,800 ft, tape)
Frequency
Responsa:
Signal-to-Noise
Ratio:
Flutter
and Wow:
AC 160 V, 110 V, 120 V, 127 V, 220 V or 240 V
50/60 Hz
90W
4-track stereophonic and monophonic
7” (18 em) maximum
7/2 ips, 3 344 ips, 1 7/8 ins
{19 cm/s, 9.6 cm/s, 4,8 cm/s)
Tape speed
7 % ips (19 em/s} 1.5 bes
3% ips (9.5 cm/s) Shrs
(with SONY SLH tape}
20~ 30,000 Hz at 7 1/2 ips (19 cm/s)
20~ 20,000 Hz at 3 3/4 ips (9.5 cm/s}
(with standard tape)
20~ 25,000 Hz at 71/2 ips (19 emis}
30~ 17,000 Hz at 3 3/4 ips (9.5 cm/s}
30~ 9,000 Hz at 1 7/8 ips (4.8 cm/s}
56 dB (with SLH tape}
53 d8 (with standard tape)
0.06 % at 7 1/2 ips (19 om/s}
0.10 % at 3. 3/4 ips (9.5 cm/s)
0.20% at 1 7/8 ips (4.8 cm/s}
SPECIFICATIONS
4-track stereo 4-track mono
3hrs
6 hrs
Recording Bias
Frequency:
Inputs:
Outputs:
‘Overalt
Distortion:
Semiconductors:
Dimensions:
Weight:
Approx. 160 kHz ,
Two MIC inputs .
impedance:
Maximum sensitivity:
Two AUX inputs
impedance:
Maximum sensitivity:
REC/PB connector
Impedance:
Input level:
Two LINE Outputs
Load impedance:
Output level:
HEADPHONE Output
Load impedance:
Output level:
1.2%
low impedance
0.2 mV (—72 cB}
100 kQ,
0.06 V (~22 dB)
10kQ
17.4 mV (33 dB)
100 k&2
0:775 V (0 d8)
BQ
12.6 mV (-36 dB) at
1 of level switch
31 mV {28 dB) at
2 of level switch
45 transistors, 1 integrated circuit, 27 diodes
17 ew) x8 Ve
(446 x 225 x 460 mm)
43 tb (19.5 kg}
(H} x18 1/8" (0)
ON Ye
SERVICE MANUAL

TABLE OF CONTENTS
Section Title Page
Specifications... ...-..-% 1
4. GENERAL DESCRIPTION
1-1, Block Diagram... . . - 3
1-2, Major Parts Locations . 4~5
1-3, Switch Location. . . . . 6
2. DISASSEMBLY
2-1, Cabinet Removal ... . 7
2-2, Head Deck Removal. . . 8
2-3. Record Equalizer Circuit Board
Removal... ...----005 8
2-4, Reverse Switch Circuit Board
Removal ........--- a5
3. ADJUSTMENT PROCEDURES
3-1, Mechanical Adjustments... .. . 9~18
3-2, Electrical Adjustments .... . . 19 ~ 32
4. DIAGRAMS
4-1. Schematic Diagram
4-1-1, Audio Amp. and Bias OSC
Circuit... 2... 055. 1 BBN 84
4-1-2, System Control Circuit ..... - 35~ 36
4-2. Mounting Diagram
Be ae
Section Title Page
4-2-1, Record Amp. Circuit Board . . . . 37~ 39
4-2-2, Record Equalizer Circuit Board . . 40~ 41
4-2-3, Playback Amp. Circuit Board . . . 42~ 44
424, Bias OSC Circuit Board ...... 45~ 47
4.2.5. Servo Control Circuit Board. . . . 48
42-6. Relay Circuit Board... ..... 49—~ 51
4-2-7. Power Supply Circuit Board. . . . S2~ 54
42-8. ESP Circuit Board... .....- 55 —~ 56
4-2-9, Reverse Switch Circuit Board . . . 57
4-3. Level Diagram. .....- 204s 58
5. ELECTRICAL PARTS LIST...... 59~ 64
6. EXPLODED VIEWS
6-1. Packing .....- Sidh Ad ES 65
6-2. Cabinet - top view—....,. . 66
6-3. Head Deck — top view~ .... . 67~ 68
6-4. Amplifier Chassis — top view — . . 69-~~70
6-5. Chassis — top view —(1) .....71
6-6. Chassis — top view - (2) .....72
6-7. Chassis — top view -(3) ... - . 73
6-8. Chassis — bottom view — .....74
7. HARDWARES........ (ae Bob dS
Hardware Nomenclature .... . rarer at)

SECTION 1
GENERAL DESCRIPTION
BLOCK DIAGRAM
V1.
sor0yy
joy
109AH
‘A000
44
804-9020
tw) ic Nie
Nem
LOLD
Ee eer |
inz~ OMe)
ONIHOLIMS:
0
|
aeov
|
ty
4n0
hit
9060
209d
00.
prousyes
VEE
9095
tosiva|
plovelos
UITIOWHINIE
OLS
't4
wi
ow
NIL
0g
23
coer
a
MOHD
dT
908
‘201
6010
1H
F
1
oN
2011010
by.
Sa
dole
238
ane OW
Lt xv
35

1-2. MAJOR PARTS LOCATIONS
Cabinet — Top View —
X-34970-26 X-34970-46 X-34970-26
ree! table ass'y knob assy, ree! table assy
| AUTO REV i
| | X-34970-81-1
X-34970-42 _ree/ panel ass‘y,
cabinet assy complete
X-34970-47 L
cover ass‘y, head ~~ i X-34970-45
X-34970-46
R
|
button
ass’y,
REC
knob assy, TT 3-497-195
TAPE SPEED ———— button, REW
1-514-867 3-497-196
switch, lever (S108) ~~ —-— button, FF
TAPE SELECT $497.192
1-514-768 fe) 1 ————- button, STOP.
switch, lever (S7 “ee _ a
HEADPHONE
LEVEL
sa
en
fener
REV
3-497-193
1-507-282
jack,
binaural;
Me
at
button,
FWD
HEADPHONE (J104) X-34970-50
S102)
1507-281 | 1102)
jack, MIC :
R(J202) —--—>
X-34970-50
knob assy, volume
control; AUX (L)
X-34970-50
knob ass‘y, volume —--—-----— st |
control; MIC (L) '
1-524-082-1171 omteas _
meter, VU (L)
|
|
i
i
Cabinet — Side Views —
171-509-359
connector, REC/PB
(J705)
3-497-237 _t
terminal, ground 4
1-507-142
jack, phono;
AUX IN
(J101, 201)
(S103, 203)
knob ass‘y, volume
—~ control; AUX (R)
—- 1-514-866 switch, lever; power (S603)
X-34970-50
| i a KNOB ass’'y, volume
| control, MIC (R)
i : i 1524-08 2-11
\
meter,
VU
(R)
[ree eee ee SOG) 1-514-836
a S705) switch, lever; MONITOR
iz
1-509-427
__ socket, power
voltage selector
(VS601)
171-509-341
_.. connector, AC
OUTLET |C/VJ601}
171-533-048
i—~ holder, fue

Chassis — Top View —
171-514-706
switch, leaf;
PLAY-FF,STOP
(S613)
171-514-707
switch, leaf;
PLAY-FF,STOP _
(S620)
1-454-075
solenoid, plunger
{(PM601); PINCH ROLLER
1-514-864
microswitch,
AUTO SHUT-OFF (2)
(S618)
8-828-629-20
head, record/erase
(ERP102-2902)
8-829-142-20
head, playback
(PP 102-4202)
1-222-497
resistor, variable;
30 kQ1(D), R131
(AUX-L)
1-514-864.
microswitch, PLAY, FF-STOP
S614 (upper)
S605 (lower) 171-514-633
_. switch, lever; AUTO
REV (S617)
1-514-864
microswitch, PLAY-FF,STOP
~S610 (upper)
S602 (lower)
1-5 14-864
microswitch, PLAY-FF, STOP
S604 (upper)
S612 (lower)
1-514-864
. microswitch, AUTO (7)
SHUT-OFF (S609)
Y¥-20410-12-9
counter, tape index
8-828-629-20
head, record /erase
(ERP102-2902)
8-829-142-20
head, playback
(PP 102-4202)
1-222-497
resistor, variable;
30 kQQ.(D), R231
(AUX-R)
3-497-207
pinch roller
1-222-498
resistor, variable;
10 kX2(D), R135
(MIC-L)
1-222-498
resistor, variable;
10 kS2(D), R235
(MIC-R)
Chassis — Bottom View —
8-836-624-07
motor, UC-624K
X-34970-65
mounted circuit
board, power
supply
1-454-074
solenoid, plunger,
DIRECTION CHANGE
(PM603)
1-441-729
transformer, power
8-836-624-07
motor, UC-624K
X-34970-66
mounted circuit
board, relay
X-34970-68
mounted circuit
board, servo contro!
X-34970-67
——— mounted circuit
board, ESP
X-34970-62
—. Mounted circuit
board, record equalizer
TOE
i
X-34970-61
mounted circuit
board, record
amp.
X-34970-64
mounted circuit
board, bias osc
X-34970-63
mounted circuit
board, playback amp.

1-3. SWITCH LOCATION
S614 (upper side)
PLAY,FF-STOP switch (4)
S605 (lower side)
PLAY,FF-STOP switch (2)
|
S613
PLAY-FF,STOP—
switch (3)
S620
PLAY-FF,STOP __.
S610 (upper side)
PLAY ,FF-STOP switch (3)
—..- S602 (lower side }
PLAY,FF-STOP switch (1)
S604 (upper side)
PLAY-FF,STOP switch (1)
S612 (lower side)
switch (4)
S618
AUTO SHUT-OFF ——
switch (2)
$607 =
FF switch (1)
S619 (upper side)
FWD-REV switch (2)
S601 (lower side)
FWD-REV switch (1)
PLAY-FF,STOP switch (2)
_. S609
AUTO SHUT-OFF switch (7)
_ 8615
PLAY switch (2)
__ S616
PLAY switch (3)
___ S608
PLAY switch (1)
S606
~— STOP switch
S617
——“" FF switch (2)

SECTION 2
DISASSEMBLY
2-1. Cabinet Removal
-x——-—~- head cover
SONY,
\Neaeee 4
® B3x8 |
(Black) :
cere! panel
@®B3x 10
Go (Black)
volume control ———x | 5 ! OB3x 10
knob . , f (Black)
(4 pes.)
O-<——ornamental washer
“——— ree! pane! washer
rubber washer
/
/
/
‘ \
\ @ RK 4x 50
washer
cabinet
t
os
|
ee washer
GO Ph 4x14

2-2. Head Deck Removal
L: Remove the FWD and REV lamps.
2: Remove the five screws shown in Fig. 2-2. Lift
off the head deck.
lamp~-— lamp
(for REV) (for FWD)
Fig. 2-2. Head deck removal
2-3. Record Equalizer Circuit Board Removal
= © PSW3x 8
Fig. 2-3. Record equalizer circuit board removal
Note: After reattaching, make the equalizer switch (S107)
position adjustment (See page 15).
2-4. Reverse Switch Circuit Board Removal
reverse switch e ® PSW3x6
circuit board
|
Fig. 2-4. Reverse switch circu/t board removal
Note: Pay attention not to cut the head lead wires.
CAUTION:
1
Install the playback and bias osc. circuit boards,
after the levers are perfectly hooked to the holes
of the slider of the slide switches.
2) The lead wire of microswitch has a connector,
which is connected to the other lead wire with a
special jig.
If the lead wire is cut or the connector is damajed,
solder the lead directly to the microswitch terminal
with an insulating tape wound around the terminal.
3
Never put the unit upside down on the hard plate
with the head cover removed.The pin of the tape
shifter, the shut-off arm pin, the tension armand
others will be bent because of the weight of the
unit. If it is necessary to put the unit upside down,
put it ona soft cloth with the head cover attacied.
4
When replacing the chassis, cut threads on it wih a
hexagon tapping screw.
Part No.
*7-685-146-31 (for 3 mm dia.)
@P3xs
*7-685-159-04 (for 4 mm dia.)
@®P4x8

SECTION 3
ADJUSTMENT PROCEDURES
3-1. MECHANICAL ADJUSTMENTS
(3-1-18) REC lock pull (3-1-12) brake torque
(3-1-4)
PLAY,
FF-STOP
switch
(S605,
614)
rod
adjustment
adjustment
(3-1-5)
PLAY,
FF-STOP
switch
(S602,
610)
position
adjustment
pa
\
ate \ iL position adjustment
(3-1-3) brake solenoid (PM602)}
(3-1-8) reel table height
position adjustment
adjustment
(3-1-8) reel table height —__ v : pry ie arm bracket position
adjustment
Tents
a7
adjustment
(3-1-20) PLAY-FF,STOP switch —
_(3-1-1) PLAY-FF,STOP (S604, 612)
(S613, 620) adjustment
position adjustment
(3-1-6) pinch roller ae
solenoid (PM601} ~
position adjustment
_-— capstan bearing position adjustment
(See page 21)
(3-1-9) servo control circuit ——~
board position adjustment tape contact check of
scrape filter roller
(3-1-19) equalizer switch (S107)
position adjustment
Wi
(3-1-21) PLAY switch (S615, 616)
position adjustment
/ \
(3-1-2) AUTO SHUT-OFF switch X
(S609, 618) position adjustment (3-1-14) pinch roller
pressure adjustment
wh
(3-1-13) direction change
stopper adjustment
Fig. 3-1. Adjusting parts locations (1)
(3-1-10]) FWD and REV back
tension torque adjustment —
(3-1-11) FF and REW back tension ———
torque adjustment ‘
(3-1-16) FWD-REV switch
(S601, 619) position :
adjustment "
_(3-1-15) direction switch joint
rod stroke adjustment
7
(3-1-18) REC lock pull
8
(3-1-17) record button
rod adjustment
block adjustment
Fig. 3-2. Adjusting parts locations (2)

(10 -FWD, REV, FF,
ape threaded, hold.
3-1-1,
PLAY-FF, STOP Switch (S604, 612) Position
Adjustment
Make the following adjustments by loosening
the two microswitch holding screws, See Fig. 3-3.
After that, apply lock paint to them.
1. STOP mode (Lock arm B is locked)
Make sure that the actuator of microswitch is
perfectly pushed with the plate spring as shown
in Fig. 3-3.
2. FWD or REV mode (Lock arm B is released.)
The actuator of microswitch should not be
pushed by the plate spring at all.
STOP to FWD (or REV) mode
8604 ‘should be released approximately one
second after S612 is released.
— $604
PLAY—FF, STOP switch (omer — S612
tock arm (B)
release
Fig. 3-3. PLAY-FF, STOP switch (S604, 612)
position adjustment
3-1-2.
Adjustment
1. Make sure that the bent portion of the actuator
pin is positioned vertically against the chassis.
If.necessary, adjust by bending the base of the
pin.
2. Loosen the two microswitch holding screws.
Adjust the position of the microswitch so that
the switch is turned ON by the actuator pin at
the position shown in Fig. 34.
3. Apply lock paint to the screws.
AUTO SHUT-OFF Switch (S609, 618) Position
4105
0~0.5mm ,
Note:
Adjust for both AUTO SHUT-OFF switch in
the same way.
AUTO SHUT-OFF switch (S609)
Tighten screw here.
(0~1/64")
/ | Adjust by bending here,
actuator pin |e
actuator pin
Fig. 3-4. AUTO SHUT-OFF switch (S609, 618)
3-1-3.
1,
Fig. 3-5.
position adjustment
Brake Solenoid (PM602) Position Adjustment
Turn OFF the power. Unhook either end of the
spring and loosen the four solenoid holding
screws. See Fig. 3-5.
Push the solenoid shaft to the full with a hand
in the direction shown by the arrow. Adjust the
position of the solenoid so that the clearance
between the timing lever and the lock lever is
0 to 0.5 mm (1/64”). Make this adjustment
perfectly otherwise an unusual noise is produced
because of the vibration of the brake lever.
Hook the spring again and turn ON the power.
Change the mode from FWD (REV) to STOP
and vice versa several times. Make sure that the
unusual noise is not produced. Adjust the
position of the solenoid, if necessary.
Apply lock paint to the screws,
brake solenoid
(PM602)
timing lever
0~0.5mm ,
(0~1/64")
spring
Brake solenoid {(PM6O2) position
adjustment

3-1-4, PLAY,FF-STOP Switch (S605, 614) Position
Adjustment
1, Place the unit in the FF ‘or REW mode, to ener-
gize the brake solenoid. Check to see that the
actuator of microswitch is perfectly pushed
with the plate spring and also that the no
clearance between the microswitch and the plate
spring is obtained as shown in Fig. 3-6.
If necessary, adjust the position of the micro-
switch by loosening the two switch holding
screws,
2. Apply lock paint to the screws.
Note:
Be careful not to turn OFF the microswitch with
the solenoid energized, as the thermistor (Pth601) on
‘the relay circuit board will be damaged because of an
unusual current.
PLAY, FF—STOP switch
(me — S605
upper — $614.
plate spring
Fig. 3-6. PLAY, FF-STOP switch (S605, 614)
position adjustment
3-1-5. PLAY,FF-STOP Switch (S602, 610) Position
Adjustment
1. Place the unit in the FF or REW -mode, to
energize the brake solenoid, Check to see that
the actuator of microswitch is perfectly pushed
with the timing lever as shown in Fig. 3-7.
If necessary, adjust the position of the micro-
switch by loosening the two switch holding
screws.
2. Apply lock paint to the screws.
“ fever
actuator
a
fe)
PLAY, FF—STOP switch
‘upper ~ $610)
tower — S&02:
PLAY, FF-STOP switch {S602, 610}
position adjustment
screw
Fig. 3-7.
3-16. Pinch Roller Solenoid {PM601) Position
Adjustment
1. Loosen the three solenoid holding screws
shown in Fig, 3-8.
2. Place the unit in the FWD or REV mode
to energize the solenoid. Adjust the position of
the solenoid so that the clearance between the
pinch roller pressure adjusting plate and the
plunger solenoid drive arm is 0.5 mm(1/64")
to 1 mm (3/64"). Tighten the screws. The
solenoid shaft should be attracted straight on
the line and in parallel with the solenoid.
3. Apply lock paint to the screws.
sorew
Adjust by positioning.
pinch rolier solenoid
{PM601)
plunger solendid _ pinch roller pressure
drive arm adjusting plate
Fig. 3-8. Pinch roller solenoid (PM601) position
adjustment :
3-1-7, Lock Arm Bracket Position Adjustment
1, Make sure that the clearance between the lock
arm (A) and the lock arm (B) is 0.5 ~1 mm
(1/64 ~ 3/64") in the FWD (or REV) mode.
In the STOP mode the clearance between the
lock arm (A) and the lock arm (B) should be
approximately 1 mm (3/64"), See Fig. 3-9.
2. Loosen the two lock arm bracket holding screws,
if necessary. See Fig, 3-9.
3. Adjust the position of the lock arm bracket.
Tighten the screws.
4. Apply lock paint to the screws.
—Ti=

screw 3. Make sure that the tape speed changes definite- F
tock arm (A) —— lock arm bracket ly, when the TAPE SPEED switch is slowly
changed to the 4.8 cm/s, 9.5 cm/s and }9 cm/s
positions, Readjust the position of the servo
control circuit board, if necessary.
4. Apply lock paint to the screws.
*) f | servo controf
5 @ = citcuit board
{ba 4 WV | (under chassis}
< Cr
ey mode FWD mode S|, | h
Fig. 3-9. Lock arm bracket position adjustment
TAPE SPEED| ][® 0) I
knob
©
3-1-8. Reel Table Height Adjustment
|
|
|
|
1, Use a7 inch reel, |
2, Thread the tape along the tape path. Place the
unit in the FWD mode. If the tape touches
either flange of the reel, adjust the reel table
height by loosening the two set screws with an
allen wrench. Here the both upper and lower
Fig. 3-11. Servo control circuit board position
adjustment
3-1-10, FWD and REV Back Tension Torque
clearances between the tape and the reel flange Adiusement
should be the same.
Note:
3. Tighten the set screws. Instructions in{ are applied to the REV back
tension torque adjustment.
7” ree! 1. Place a 7” reel with string wound several turns
x counterclockwise [clockwise] onto the FWD
{ih a [REV] supply seel table, Tie the string to the
7
aN
spring
scale.
‘
i * same cleat eae. 2. . Measure the back tensions by pulling the 0 to
‘reel
table
‘i
.
400
g
(14
oz)
spring
scale
at
approximately
9.5 cm/s (3-3/4 ips) speed in FWD [REV]
set screw : mode. See Fig. 3-12.
It should be 200 to 240 g.cm (2.78 to 3.32 02.
inch).
Fig. 3-10. Reel table height adjustment
ee 3. Adjust the slider of R609 by loosening the
3-19. Serve Control Circuit Board Position screws, if necessary.
Adjustment
puil a scale
1. Loosen the two servo control circuit board
holding screws shown in Fig. 3-11. Set the tape
speed switch to the 9.5 cm/s (3-3/4 ips) position
(center).
0
to
400
g.cm
(8.5 oz-inch}
2. Thread the tape along the tape path. Place the soring’scale
unit in the PWD mode. Adjust the position of
the servo control circuit board together with the
heat sink so. thatthe TAPE. SPEED is ‘ i
9.5 cm/s. Tighten the screws. Fig. 3-12. FYWD and REV back tindion torque
adjustment
-12-

FWD back tension -
adi. hs
Set this slider ~~
at center position
REV back j
adj. He ROSOP “FF and REW back
tension torque adj.
Fm a
Back tension torque adjusting parts location
Fig. 3-13.
3-1-1171. FF and Rewind Back Tension Torque
Adjustment
Note: :
Instructions in [ ] are applied to the REW back
tension adjustment.
1. Place a 7” reel with string wound several turns
counterclockwise [clockwise] on the hub onto
the FWD [REV] supply reel table. Tie the
string to the spring scale.
ic)
Measure the back tension by pulling the 0 to
400 g (14 0z) spring scale at approximately
9.5 cm/s (3-3/4 ips) speed in FF [REW]
mode. See Fig. 3-12. It should be 60 to
80 g.cm (0.83 to 1.1 oz inch).
3i Adjust the slider of R608 by loosening the
screw, if necessary.
3-1-12. Brake Torque Adjustment
This adjustment should be performed for both
supply and take-up sides.
Note:
Instructions in [| ] are applied to the take-up
brake torque adjustment.
iB Place the unit in the STOP mode.
Place a7. reel with string wound several turns
counterclockwise [clockwise] on the hub onto
nN
brake le ver.
H ae
on
900~ 1200 g. cm ax.
(12.5~ 16.7 oz. inch)
}
plate spring
oe
5
|
ye
stopper
1°(§
Pepe |
the reel table. Tie the string to a spring scale.
3; Pull the scale in the direction shown by the
red arrow, making sure that the string does
not touch either flange of the reel. The reel
table will rotate counterclockwise [clockwise].
Take a reading only when the reel table is in
steady motion.
4. The scale reading should be 900 g.cm (12.5 oz.
inch) to 1,200 g.cm (16.7 oz.inch).
o Rewind the string by turning the reel clockwise
[counterclockwise].
6. Turn string several times clockwise [counter-
clockwise] on the hub onto the reel table.
7. Pull the scale in the direction shown by the
black arrow, making sure that the string does
not touch either flange of the reel.
The reel table will rotate clockwise [counter-
clockwise]. Take a reading only when the reel
table is in steady motion.
8. The scale reading should be 300 g.cm (4.17 oz.
inch) to 400 g.cm (5.55 oz.inch)
9. If the satisfied results are not obtained, idjust
by changing the hooking position of spring.
Specification:
Brake Torque of Supply Reel
in clockwise turning..... 300—400g.cm
(4.17—5.55 ozinch)
in counterclockwise turning ........
900—1,20) ¢-cm
(12.5—16.7 ozinch)
Brake Torque of Take-up Reel
in clockwise turning..... 900—1,20)g. cm
(12.5—-16.7 o2in ch)
in counterclockwise turning ........
300—4008.cm
(4.17—5.55 ozinch)
brake lever
G00 ~ 7200 g- cm
(12.5 ~ 16.7 oz- inch)
300~ 400 9. cm on hoy) 300~ 400 g- cm
(4.17~
5.55
a
a
=
ya
j
Ss
(4.17~
5.55
oz.
inch}
wea K F eho
{ ‘ Pee’: 4 reel table
spring
\
L
spring
Cents
strong brake adjusting g
arm
Fig. 3-14. Brake torque adjustment
pay ee

3-1-13. Direction Change Stopper Position
Adjustment
1, Loosen the stopper holding screw.
2. Place the unit in the FWD (or REV) mode.
Adjust the position of the direction change
stopper so that the clearance between the
stopper and the tape direction change lever is
4 mm. (3/32).
3, - Change the mode from FWD to REV and vice
versa scveral times. Make sure that the position
of the pinch roller changes when the mode is
changed.
4. Apply lock paint to the screws.
pinch roller
REV mode
direction ‘direction
change stopper (L) change stopper (R)
4mm (5/32") 4 mm (5/32")
in REV mode in FWD mode
Fig. 3-15. Direction change stopper position
adjustment
3-1-14. Pinch Roller Pressure Adjustment
at Make a loop in a piece of string and attach the
0 to 1,600 g (3 Ib 8 oz) spring scale around the
base of the pinch roller shaft. See Fig. 3-16.
Pull the scale. The pulling direction should be
aligned with the pinch roller shaft and the
capstan. Check the reading when the pinch
roller just stops rotating. It should be 1,200 to
1,400 g (42 to 49 oz ). If necessary, change the
hooking position of the spring.
Adjust by changing the hooking position.
strong
i(
weak
14
REV mode FWD mode
spring scale
Fig. 3-16. Pinch roller pressure adjustment
3-1-15. Direction Switch Joint Rod Stroke Adjustment
1. Piace the unit in the STOP mode, Push the tip
of the direction switch lever slowly in the
direction shown by the arrow in Fig. 3-17 as
far as the slide switches ‘on the playback and the
bias ose. circuit boards are changed. (Do not
move the position of switch).
2. Push the REV button. Make sure that the tip of
the lever is pushed moreover by 0.5~ 1] mm
(1/64 ~3/64") in the direction shown by the
arrow by the solenoid.
3. Change the mode from the FWD to REV and
vice versa several times and make sure that the
slide switches are changed perfectly.
4, Change the position of direction switch joint
rod to the direction change lever if necessary.
05~1mm _,
(1/64~ 3/64")
be
1 Change position of
joint rod.
itch joint rod
Remove direction switch joint rod‘
by bending here. 4
direction
switch fever
Fig. 3-17. Direction switch joint rod stroke
adjustment

cm
1-16, FWD-REV Switch (S601, 619) Position
Adjustment
Loosen the two screws.
Place the unit in the REV mode to energize the
direction change solenoid,
Adjust the position of the microswitch so that
the actuator is perfectly pushed with the joint
plate, Tighten the screws,
Apply lock paint to the screws,
[aes f
direction solenoid
PME03
FWD-REV switch
screw coe — S619
Jower — S601
pluhger
Joint plate
Fig. 3-18. FWD/REV switch (S601, 619) position
adjustment
3-1-17, Record Button Block Adjustment
i
See Fig. 3-19, Place the unit in the STOP mode.
Check to see that the clearance between the
REC button block and the record arm holder
is 0.5 (1/64") to 1 mm (3/64”). If necessary,
adjust the position of the REC arm holder by
loosening the screws.
Make sure that the slide switches (S103, 104)
on the bias circuit board are perfectly switched,
when the REC button is locked, Readjust the
clearance between the REC button block and
the REC arm holder, if necessary.
Apply lock paint to the screws.
REC button block—__,)
(1/64~ 3/64")
(When the REC
button released}
record arm holder
REC switch
eerewy: (S103, 104)
bias ose circuit board
Fig. 3-19. Record button block adjustment
~15—
3-1-18. REC Lock Pull Rod Adjustment
a)
b)
c)
no clearance
in STOP mode + ry
Place the unit in the STOP mode. Turn the split
nut clockwise until the tip of the REC lock pull
tod is in contact with the REC lock rod.
Moreover, turn the split nut slowly one or two
times after the tip of the pull rod is in con-
tact with the REC lock rod. Press the nut by
using a pliers.
Make sure the followings.
Lock the REC button in the STOP mode. The
REC button is released when the FWD or REV
button is pushed.
Lock the REC button slowly in the STOP mode,
The REC lamp. lights before the button is
locked.
Lock one of the two REC buttons in the STOP
mode, The button is released when another is
locked.
Apply contact cement to the nut.
split nut
L-
@
spring.
™!
(2)
|, --—~ REC lock pull rod
|_-REC lock rod
J
‘
44
Fig. 3-20. REC lock pull rod adjustment
3-1-19. Equalizer Switch (S107) Position Adjustment
1 Loosen the two screws as shown in Fig. 3-21,
Set the tape speed switch to the 9.5 cm/s
(center) position.
Move the screws so that the equalizer switch is
set at the 9.5 cm/s (center) position,
Change the tape speed switch to the 4.8 cm/s,
9.5 cm/s and 19 cm/s positions and vice versa
several times. Make sure that the equalizer
switch is ‘definitely changed.
Apply lock paint to the screws,

equalizer switch screw A (or screw B) in Fig. 3-23. Make sure
! 1 $107 that the switch is not turned ON by the play of
H { the FWD button.
screw
2.
Apply
lock
paint
to
the
screws
A
and
B.
FWD or REV button
— ©
VU meter {L-CH) S615!
S616
} PLAY switch
Fig. 3-21. Equatizer switch (S107) position
adjustment
screw B
1. @T ttor S616)
3-1-20. PLAY—FF, STOP Switch (S613, 620} C=
Position Adjustment dae
{for S615}
i. Place the unit in the STOP mode. See Fig. 3-22.
Fig. 3-23. PLAY switch (S615, 616} position
Make sure that the distance between the
adjustment
plunger joint plate and the leaf A of the leaf
switch is 0 to 0,5 mm (1/64"), and also that the 3-1-22 Adjustments after Head Replacement
leaves A and B are in contact with each other
completely. If necessary, adjust the switch For FWD Direction
position by loosening the screws.
2, Place the unit in the FWD (or REV) mode, to
energize the pinch roller solenoid. Make sure
that the leaves A and C are perfectly in contact
with each other,
When replacement of more than two heads are
required, leave one of them unrémoved for the refer-
ence of adjustments. Do not remove all the heads at
the same time.
3. Apply lock paint to the screws. A} Playback Head Replacement
1. Replace the playback head by removing the
angle adjusting screws, See Fig. 3-26.
Do not move the height and zenith adjusting
sctews.
PLAY—FF, STOP switch
—_—_—
2. Play back the alignment tape (J-19-A2),
Make the azimuth and angle adjustments.
See page 23.
3. Paint the head core with black ink as shown in
plunger————~ Fig. 3-24.
joint plate
record/erase playback
Sead head
0~0.5 mi
(0~ 1/64}
Fig. 3:22. PLA Y-FF, STOP switch (S613, 620)
. position adjustment
3-1-21. PLAY Switch (S615, 616) Position
Adjustment
core
I.
-
Make
sure
that
$615
(S616)
is
turned
ON
when
geil
|
seetace
2
p
tape
the FWD (or REV) button is pushed and also : 4 ' height :
that it is. turned OFF when the button is zenitir” adjusting
released. If necessary, adjust the position of adjusting screw — Strow
PLAY switch 8615 (or $616) by loosening the Fig. 3-24. Head zenith and height adjustment

shifter arm (tL)
After the ink dried, run the tape in the FWD
direction for 20 to 30 seconds. Watch the ink
on the core fading away. When the same wide a-
mount of the faded away part cannot be
obtained at every point, turn the zenith and
height adjusting screws in the direction shown
by the arrows. See Fig. 3-24.
Repeat this step several times until the satisfied
result is obtained. After the. adjustment clean
the core with a soft cloth dampened with de-
natured alcohol.
For the record head tracking adjustment, con-
nect a VTVM and a 100 k& resistor in parailel
with the LINE OUT jack, deliver the 1 kHz
signal (—60 dB) to the MIC jack. Set the
MONITOR switch to the TAPE position. Place
the unit in a normal stereo record mode.
Turn the record head zenith and height adjust-
ing screws in the same amount of the same di-
rection so that the same maximum output can
be obtained at both channels.
Play back the alignment tape (J-19-A2), and
make the playback azimuth adjustment again.
Make the playback level and equalizer adjust-
ments. See page 23 and 24.
Apply lock paint to the adjusting screws,
Record/Erase Head Replacement
Remove the azimuth adjusting screw and the
head holding screw (with spring). Replace the
head with the mounting plate. Do not move the
zenith and height adjusting screws.
Make the. record head azimuth adjustment.
See page 25,
9
Paint the record/erase head cores with ink as
shown in Fig. 3-24.
After the ink dried, run the tape in the FWD
direction for 20 to 30 seconds, Watch the ink on
the core fading away, When the ink does not
fade away in the same wide amount at’ every
point, turn the zenith and height adjusting
screws in the direction shown by the arrows.
See Fig. 3-24. Repeat this step several times
until the satisfied result is obtained. After
adjustment clean the cores with a soft cloth
dampened with denatured alcohol.
Make the record head azimuth adjustment again.
See page 25.
Make the record head track adjustment. See
page 25.
Make the record bias adjustment, overall fre-
quency response and erase ratio Measurement.
Make sure that the positioning relation between
the head core and the tape is correct, See
Fig. 3-25,
Apply jock paint to the adjusting screws,
For REV Direction
The tape guide (4), which is used for the REV
tape path adjustment, should not be adjusted in the
head replacement. d
The adjustments after playback and record /erase head
replacement are the same in procedure as in the FWD
head replacement,
tape
guide
(2)
for
FWD.
tape
guide
(3)
tape
guide
(4)
for
REV
faee
pute
(8)
ee
ceii
recordferose
playback
al
La,
\
playback
head
record
Stee
tape
guide
am
ine
a
7
ma
‘
_aeshifter
arm
*]
0.5
min!
es
ES
10.025
5
ld
|
re
Fig.
3-25.
Head
adjustment
-17-

Checks After Mechanical Adjustment
1. Torque Check
FWD, REV torque ... more than 200g. cm
(2.78 oz. inch)
FF, REW torque more than 100 g. cm
(1.39 02. inch)
FWD, REV back tension
200 — 240 g. cm*
(2.78—3.32 oz. inch)
FF, REW back tension
(0,83—1.1 02. inch)
* : adjustable
After making adjustments, clean the following
parts with a soft cloth dampened with denatured
alcohol; head core, tape guide, pinch roller,
scrape filter roller, brake contact part of the
reel table.
Tape Contact Check of Scrape Filter Roller
a) ‘Thread a 7-inch tape along the tape path and set
the tape speed switch to the 4.8 cm/s position.
b) Run the tape, Make sure that the scrape filter
roller is rotating. Stop the roller by fingers.
Make sure that the roller starts rotating again
when taking off the fingers from the roller,
If necessary, adjust the position of the scrape
filter roller by loosening the screw.
Wow and Flutter Measurement
Make measurements at the beginning and the
end of the tape. The measurement may be done
with the unit set to either FWD and REV
mode.
*At 19 cm/s (7-1/2 ips) and 9.5 cm/s (3-3/4 ips)
tape speed
Steps
qa)
Connect a wow meter and a 100-kQ resistor in
parallel with the LINE OUT jack.
(2) Set the MONITOR switch to TAPE,
(3) Play back the alignment tape indicated below.
(4) Make sure that the satisfied result is obtained
on the wow meter,
rrr |
tape speed | specification remarks
19 cm/s less than Play back SONY
(7-4 ips) 0.12 % alignment tape
9.5 cm/s
(3-% ips)
(RMS) WS-19-7
less than
0.15 %
(RMS)
Play back SONY
alignment tape
WS-9-7
*At 4.8 cm/s (1-7/8 ips) tape speed
Steps
(1) Set the record volume controls to the position
specified in Precaution (8) on page 19.
(2) Connect a wow meter and a 100-kQ resistor in
parallel with the LINE OUT jack.
(3) Set the MONITOR switch to TAPE.
(4) Deliver a 3-kHz signal of -60 dB (-10 dB) to the
MIC (AUX) jack,
(5) Record the signal on the blank tape.
(6) Make sure that the satisfied result is obtained
on the wow meter.
Specification less than 0,40 % (RMS)

3-2, ELECTRICAL ADJUSTMENTS Output side
L-CH LINE
: L-CH PB amp. OUT jack
Precaution: 4
Before making adjustment, make sure to read
the following carefully.
(1) Equipment to be required are as follows: R-CH PB amp.
Audio oscillator (AF OSC)
Attenuator (ATT)
VTVM Nair
Oscilloscope LINE OUT jack
Digital frequency: counter (6) Input and output levels are specified as follows,
SONY alignment tape
unless otherwise specified.
*J-19-A2 (for head azimuth and angle adj.)
*J-19-F2 (for 19cm/s level and equalizer adj.) Normal input level MICRO—
*J-9-F1 (for 9.5 cm/s level and equalizer adj) PHONE AUX IN
sence? (for tape speed adj.) Signal source impedance 3002 10k2
Exod restore Input signal level -60dB ~104B
600 2, 300 2, 10 kM, 100 k2 (0.775 mV) (0.245 V)
Normal output leve)
(2) SONY alignment tapes contain the following
information in the sequence indicated. LINE OUT
Load resistor 100 kQ
ef «fo fe fe [om fw [om Output level 0 dB (0.775 V)
7s Rin 10
sagp, | fouls | acoso a ae a ee (7) The switches should be set to the following
Sau _[ soni | 400 ne [Sette evs | 2000) BOM: position, unless otherwise specified: “
ee ioup [bas -30u8 ftom | tous | 1008] - lod
S047 Taite 0a
*TAPE SPEED 19cm/s (7% ips)
: *TAPE SELECT —— NORMAL
(3) Make sure to demagnetize the record/erase and *AUTO REV ———— NON REV
playback heads with a soft cloth dampened
with denatured alcohol. (8) The record volume controls should be set to
the followi sition, unless oth speci-
(4) Make sure to demagnetize the record/erase and fied Oe ARs pene
playback heads by using a head demagnetizer.
*MIC volume control (In using the MIC jack)
(5) Equipment Connection Turn the AUX volume controls fully counter-
Input side clockwise, set the MONITOR switch to
audio SOURCE and deliver a 1 KHz signal of —604B
Oscillator “CH MIC or L-CH (0.775 mV) to the MIC jack. Adjust the MIC
AUX IN jack volume controls so that the VTVM reads
dB (0.775 V).
*AUX volume control (In using the AUX IN jack)
Turn the MIC volume controls fully counter-
clockwise, set the MONITOR switch to
SOURCE and deliver a | kHz signal of
~10 dB (0.245 V) to the AUX IN jack.
600 22
RCH miCor Adjust the AUX volume controls so that the
AUX IN jack VTVM treads 0 dB (0.775 V).
Input Rx
MIC 02 (9) The adjustments. should be. performed in the
AUX IN 10.KQ. sequence, unless otherwise specified.
—19—

zenith adjusting
zenith
adjusting
;
screw
agate
B
screw
FWD
azimuth
adjusting
azimuth
adjusting
REC/ERASE
4
screw
screw
|
REV
neag
height
adjusting
m
angle
adjusting
REC/ERASE
SCrEW
~
screw
head
azimuth
adjusting
height
adjusting
screw screw
height
adjusting
|_
azimuth
adjusting
FWD
screw
screw
k
: F
ers
angle
adjusting.
height
adjusting
screw
Screw.
sees
A
:
nee
:
woe
REV
zenith
adjusting
aes
:
2
=
angle
adjusting
playback
screw
:
oe.
,
S
ve
:
a
screw
hase
zenith
adjusting
screw
Fig.
3-26.
Adjusting
parts
location
(7)
tape
speed
adj.
vo/tmeter
A
48cm/s
9.5cm/s
19
cm/s
(R905)
(R901)
Set
at
DC
50~250
V
range.
reverse
time
adj.
(R717)
:
ESP
adj.
checking
point
for~
ae,
adj.
capstan
bearing
1)
position
adj.
|
=
=
|
-
:
|
,
'
servo
control
©
checking
point
for
circuit
board
ESP
adj.
Fig.
3-27.
Adjusting
parts
tocation
(2)
trap
coil
adj.
playback
level
adj.
bias
leakage
adj.
“Tro7
(,)
1508
(R)
record
bias
adj.
R317. «R316
~—«L
401
(R)
L301
(L)
/
/
Ci12.
C810
C511
C513
(REV-L)
(FWD-L)
\
/
/
(REV-L)
(FWD-L)
(FWD-R)
(REV-R)
~~
\
/
y
oO
9.5
cm/s
playback
}
R321
(L)
a
(
equalizer
adj.
ae
C509
\
REV
bias
Peete
frequency
ad
f.
R320
——~~
R128
}
(REV-L}
a
LL
(REV-L)
R319
ss
Bee
ee
BAGG
J
R127
19
cm/s
(FWD-L)
a
Wee
oat)
Se
RN
Oe
|B
/FWD-L)
|
record
eve
J
playback
-
4
R419
|
.
a
t
mlKG
g
Se
t:
at
eEoaS
goo7
"adj.
equalizer
adj.
Wn_R}———
2
(gk
;
oe
eae
——
]
(FY/D-R}
(FWD-R)
|
R420
——
R228
Cee
2
Y
(REV-R)
-
~
ae
9.5
om/s
playback
|
pypy
(RJ
Ra17
“R416
|
RASA
(R)
ABSA
IL)
L503
L504
1506
~
L805
equalizer
adj.
(REV-R]
(EWD-R)
~~
(FWD-R)
(FWD-L)
(REV-L)
(REV-R)
oo
VU
meter
playback
level
calibration
dummy
coil
adj.
adj.
Fig. 3-28. Adjusting parts location (3)