Sony TC-630 User manual

: Power Requirements:
Tape Speeds:
Reel Size:
Track System:
Frequency F.esponse:
(NAB}
Wow and Flutter:
(NAB)
Power Output:
Signal-to-Noiss Ratio
Harmonic Distortion:
Recording Level Indication:
Tone Con*rob:
Inputs:
Canadian Model!
E Model
US Model
AEP Mode!
UK Model
STEREO
TAPECORDER
SPECIFICATIONS
85W (100 VA), 117 volts
(USA, Canada Mode!) :
B5W, 100, 110, 117, 125, 220 & 240 volts
{E, AEP, UK Model)
(Voltage selector provided in the set)
AC 60H: (USA, Canada Made!)
AC 50 or 60 Hz (E, AEP, UK Model)
{Convertible with power frequency selector
and capstan sleeve}
19 cin/s. 9.5 cm/s and 4.8 cnvs
TA ips, 3% ips and 1% ips
7 inches or smaller
4-track stereophonic or monephonic
30.22,000 Hzat 19¢em/s, 7% ips
30~13,000Hzat 9.5cm/s, 3% ips
30~ 10 000Hzat 4.8cm/s, 17% ips
Less than 0.09% at 19cm/s, 7% ips
Less than 0.12% at 9.5cm/s, 3% ips
Less than 0.16% at 4.8crv/s, 17/5 ip?
15W (max:mum) per channel
40'N (dynamic power) with both channels
Better than 50 dB
Less than 1.2% (at normal recording level
Less than 0.5% iin working as an amplifier)
Two VU meters
Two separate controls for bass and treble
Low impedance micropkone inputs:
-72 dB (0.2 mV)
High impedance auxiliary inputs:
-22 dB (0.06V)
High impedance tuner inputs:
-22 dB (0.06V)
Phonograph inputs: -52 dB {2 mV)
Outputs:
Recording Time:
(vzith 1,800 ft tape)
Semiconductors:
Heads:
Dimensions:
Weight:
Line outputs: 0 dB (0.775¥),
Load impedance 100ki2
Speaker outputs (for external):
Load impedance 822
Speaker outputs (for lid}:
Load impedance 162
Headphone outputs (for monitoring):
Load impedance 82
Headphone outputs (for listening):
Load impedance 82
4-track stereo
1.5 hrs at 19cm/s, 7% ips
3hrsat 9.5cm/s, 3% ips
Gtrsat 48cm/s, 1% ips
4-rack mono
Shrsat 19¢em/s, 7% ips
6hrsat 9.5crm/s, 3% ips
t2hrsat 4.8cmvVs, 17: ios
Transistor: 40 pcs.
Diode: 7 pes,
Record: PP 30-2902A
PP 102-2902
Serial No. 124701 and tater}
Playbac::: RP30-2902
RF102-2902
(Serial No. 124701 and later)
Erase: E&18-2902A
454(w!
x
506
tn)
x
294
'd)
mm
177/,
(w)
x20
(h}x11°/,
(d)
inches
21 kg, 46 tb 3 oz
SONY
SERVICE
MANUAL

TABLE OF CONTENTS
When
ordering
replacement
parts,
use
PART
NUMBERS
listed
in
Parts
Lists
or
shown
in
EXPLODED
VIEWS.
-
.
Parts
List
reference
numbers
should
not
be
used.
All screws in this service ) manual are Phillips type (cross. recess type) unless
otherwise indicated,
(-}: slotted head ©
Section Title Page
Specifications: sass. s2ce-5 sss ceeveasbes cesses ate Slee vig See A echen relee 1
1. OUTLINE
lehs. Block: Didgramy: <<i3 sth stedeicesteisid shaven atte eden erica Nitec masiceeeat 3
122: Cabinet: Top Views ccs secs 2c. ccc cde eeed ao at Se ae 4
1-3. Cabinet Side Views (AEP, UK) .0..... ccc cece ceccenee ener centnereteeeeeees 4
14. Cabinet Side Views (USA, Canada) 0... cccceceeeeeeeeeeeeeeeereee 5
1-5. Cabinet Side View (E) oo... ccecccesscccescccecesceseecsecceceessererssasaeecs 5
14. Chassis Side Views (USA, Canada) ........cececcceccccecceeecee sense cseecesseees 6
1-72. 2Ghassis: Tope Mid we cok2sckes2ecenisahedansece scsecsoseasavennes pdeetbnetunctneetoisgochestonet 6
1-8. Chassis Bottom View (AEP, UK) oo... .cccccccccccccccccceeseeceecesseeeeeceerees 7
1-9. Chassis Bottom View (E, USA, Canada) 0... ccceeeseeeeterreeeeees 7
2.
DISASSEMBLY
i
ccckciteid
Seis
heen
atin
te
ieee
seenens
8
3. MAINTENANCE: 2o.c22ccctescclndesstevicaciaideeek ti hnieniicn ween ins 9
4. ADJUSTMENTS
4-1. Mechanical Adjustments .......... cc ccccseeceecereeeeeeeeneeesererecessnneeaeeneereses 1]
4-2. Adaptation to Different Power Line Frequency ...........c.0. cere 15
4-3. Electrical Adjustments 0.0... cceccsseceeesssseecesseneeeeees ceteaeenerenneneeners 16
5. DIAGRAMS
S-1. Wiring Diagram (E) .0.........csescsssceeeccseceeeeseeteeceeeneeceeeceentserecsereenseees 19
5-2. Wiring Diagram (USA, Canada).......ccecceeeereesesseteectertertteeene 22
5-3. Mounting Diagrams ...........:cccsce cscesseeeeeeceseseneneceenaneeeseeseateesaeenaereess 25
Record Amp Circuit Board — Conductor Side -— oe 25
Trap & Dummy Coil Circuit Board — Conductor Side -............. 26
Bias OSC Circuit Board — Conductor Side — ........ ce eeeeseeeseeeees 25
Playback Amp Circuit Board — Conductor Side — «0... eee aT
Power Amp Circuit Board — Conductor Side — o....eeeeeeeeeeee 28
5-4. Schematic Diagram ........... cece ceeecseeceeeecee seeseeseecneecennnnanaeenesereeeeees 29
$-5. Level Diagrams ..................csceeceesesceneeeecetsccesssneesaeeeneneneeneseceeceeeeaereess 32
6. EXPLODED VIEWS
6-1. Control Chassis — Top View — ..........ccccccesescesseeeecenneseseeessesonensooeeee 33
6-2. Chassis — Bottom View — .2...cceescececssecteccenessteesaeeceesesenecserensneeeee 34
6-3. Amp Chassis — Top View — ........ecsccccessrsececssreeeseeeseesessceeseesesesseses 35
6-4. Head Deck — Top View — .........ccessceescssseserecereeceneencseceeercensceeecees 37
6-5. Head Deck — Top View — Serial No. 124, 701 and later............ 38
6-6. Chassis — Top View — ......ccsccsscescesesseesessseseneeseneesessseeesseeseseeees 39
6-7. Cabinet — Top View — .........ccesccsssesseersececsrecessaceereeseseseeseesereeerees 41
6-8. Speaker Box — Top View — ....ccccsccccecersssseresseeesnesseesseerseeseeseneens 42
7, ELECTRICAL PARTS LIST oun... ccc secceceeeeensecseneeseeenaseceeeesesscneeeeee 43
8.
HARDWARE
oo...
.ccccc
cece
ceeccccscccceccensscecsenssceneesesssescecsenssenetseceeseseseranees
ree
47

SECTION 1
OUTLINE
BLOCK DIAGRAM
1-1.
SOE~ 1080
duv
2
ry)
431d
are
JNOHAVIH
Sra
1g
eIV
dW
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J
°°
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oul]
——
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dV
02
8
23H
dWnv
aud
L160
anit
e
FdvL
:
61Z~E1Z0
Ztz
°k8Z0
602~L0Z0
p
907
‘S0ZD
bo.
Had
Jdky
er
anit
we
HIAIEG
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ow
Homu
ne
we
eo
8
GYOI3Y
wenn
ONOHd
oY
x¥
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0110
NILSIT
4
At
ZOE
“OED
Py
Hz
YOLVTNIISO
f~<
3NOHdOVIH
©
.
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nee
xP
ae
YOLINOW
YOLIINNOI
8d/934
gaiig
ote
sil
601~2010
ag
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ed
¥3MOd
dINY
JNIT
zounos
|
ds
1x3
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dwvaud
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Inns
ONOHd
H9-1

CABINET TOP VIEW
1-3.
CABINET
SIDE
VIEWS
(AEP,
UK)

14. CABINET SIDE VIEWS (USA, Canada)
1-5. CABINET SIDE VIEWS (E)

t-6. CHASSIS SIDE VIEW (USA, Canada)
1-514-520
switch, slide; SP
SELECTOR (S108, 208)
1-7, CHASSIS TOP VIEW
1-§14-416
switch, TAPE SPEED &
equalizer (S103, 203, 301)
1-222:209
resistor, 200k 92 (C);
variable (R135, 235)
1-514-519
switch, rotary; INPUT
SELECTOR (S102, 202}
1-222-202
resistor, 50KQ (AJ, variable
w/switch (R136, 236)
1222-119
resistor, 200KQ (A);
variable w/switch (R651)
1-514-449
switch, rotary; SOS
‘S3
03}
1-221-916
resistor 50k (A;
variable (R302, 304, 402, 404,
1-222-208
resistor, 100KQ;
variable (R342}
1-221-916
resistor, 50k2 (Al;
variable (R308, 408)
1-514-520
switch, slide;
SP SELECTOR (S108, 208)
1-514-515
switch, rotary; MODE
selector (S109, 209)
1-516-037 (USA)
1-514-852 (AEP, UK)
1-§14-225 {E, Canada}
switch, lever; POWER ‘S305)
1-516-037 (USA)
1-514-325 (AEP, UK)
1-514-325 (E, Canada}
switch, lever; POWER
AMP (5306)

1-8. CHASSIS BOTTOM VIEW (AEP, UX)
1-514-416
switch, rotary; TAPE
SPEED & equalizer
(S103, 203, 301)
X-34510-55-1
;
complete
circuit
board
--—
fog
power
amp
.
1-533-026-11
holder, fuse; 3P
X-34518-53-1
X-34510-52-1 a
:
complete
circuit
board,
complete circuit board,
playback
amp
Sis
OSC
-.
;
Auch
Bi
1-514-518
;
oan
:
pre
aaty
8
are
yane
-
switch,
rotary,
INPUT
i
:
-
,
:
)
SELECTOR
(S102,
202)
X-34510-51-2
complete
circuit
board,
secord
amo
1-9.
CHASSIS
BOTTOM
VIEW
(E,
USA,
Canada)
171-514-4135
switch, rotary; TAPE
SPEED & equal zer
($103, 203, 301)
X-34510-55-1
cumplete circuit board,
povrer amp
X-34514-53-1 (Ej
X-34514-52-1 (USA, Canada)
complete circuit boar?
bias osc
X-34510-52-1
complete circuit board,
playback amp
1-514-519
switch, rotary; INPUT
SELECTOR (S102, 202)
X-34510-51-2 (E} :
X-34514-51-1 (USA, Canada} -
complete circuit board,
record amp

SECTION 2
DISASSEMBLY
2-3. Handle Grip Removal
Knob and Head Cover Removal
2-1.
ornamental screw
head cover ass’y
handle grip
speed selector
knob ass‘y
mode selector
knob ass‘y
instant stop button
ass’y
2-4. Cabinet Removal
Reel Panel Removal
2-2,
screw @P 3x8
screw, omnamen tal
Ly
cabinet ornamental wesher

SECTION 3
MAINTENANCE
3-1. Lubrication
The
following
parts
of
the
tape
transport
mechanisin
require
lubrication
after
two
thousand
hours
of
operation
or
once
a
year,
whichever
occurs
first.
Lubrication
is
important
to
insure
proper
operation
of
the
equipment.
Motor:
Motor
requires
4
or
5
drops
of
SONY
Oil
(ight
machine
oil).
Fig.
3-1
Motor
lubrication
Capstan:
Capstan
requires
2
or
3
drops
of
SONY
Oil (light machine oil).
Pinch
Roller:
Pincn
Roller
requires
2
or
3
drops
of
SONY Oil (light machine oil).
Idler:
Idlers
require
lubrication
only
if
they
become
noisy.
Use
no
more
than
one
drop
of
SONY
Oil
(light
machine
oil).
CAUTION
if the cil is spilled on the rubber
whee! or the belt. wipe *t 11
immediately with denatured
alcohol.
3-2. Cleaning
The
following
parts
must
be
cleaved
wiih
a
lintless
cloth
moistened
with
denatured
alcohol
for
optimum
performance.
—
capstan
pinch roller
fly wheel
idlers
tape 24.8
heods
This
cleaning
is
importait
for
the
tape
threading
path
to
prevent
i
ress
of
positive
drive
x.
cupstan,
dropouts,
wew
ard
flutter,
cr
coor
freavency
response.
Fig. 3-2 Lubrication
9

as
“1C-630 _
eee
ee tea,
.
TC-6
SECTION 4
ADJUSTMENTS
+1. MECHANICAL ADJUSTMENT
Rewind
Idler
Adjustment
Pinch
Roller
Shaft
Height
Adjustment
in
REWIND
mode
in
FORWARD
mode
If
bs't
does
not
rur:
smoothly,
adjust
;
Yay
by
bending
up
or
down
with
pliers.
pinch
roller
snaft
17~17.4mm
rewind lever
~
(*3h4~'"A6")
——— head deck
Do not make scratch.
(fror? view)
so Suomi resleable 1. When adjusting roughly 2. When adjusting accurately
Adjust by bending with pliers Adjust to obtain 17~17.4 mm (*3h4~ M6)
moving up or down as shown below. by loosening the screw and moving the
shaft up or down.
Capsta iti j
pstan idler Position Adjustment After fastening the screw, apply lock paint.
in STOP mode at the speed of 4.8 cm/s (174 ips)
Adjust by bending
with pliers. {
. Pinch roller up & down cam
RP
screw
approx. 0.4~2mm
ax (ha~Sha")
pinch roller up & down cam
(top
view)
cy
wired
(Bottom
sited
(top
view)
C2
7
|
Bias
Shut-Off
Switch
(S304)
Position
Adjustment
Adjustment
locations
in
FORWARD
mode
Correct
the
eatas
be
cae
ais
FAST
FORWARD
Lever
Position
Adjustment
PTI
in
FAST
FORWARD
mode
hohe
microswitch
ON position
Adjust by bending up or down with pliers.
Loosen the screws shown and adjust the switch position.
(side view)
(top view)

———
Capstan Idler Slip Check
in FORYIARD mode at the speed of 4.8 cm/s (17/s ips)
capstan idler
motor pulley
idler inclines when flywheel is finger-stopped.
If idler slips, clean the :urface of idler with denatured
alcotol.
Instant Stop Lever Adjustment
in
FORWARD
mode
without
capstan
sleeve
attached
instant
stop
lever
| Vi
Loosen the screw and adjust
the position of adjusting plate.
pinch lever
(top view)
Automatic
Shut-Off
Switch
Adjustment
shut-o/f position
aw a
2mm
ie
actuetor
actuator guide
Loosen the screws and adjust by siliding micraswitch holder.
| (side vieww)
flywheel
Motor Pulley Height Adiustment
in FORWARD mode at the speed of 4.8 cm/s (17% ips)
Capstan Idler Height Adjustment
in STOP mode at the speed «of 19 cm/s (7'4 ips)
take-up reel table
take-up idler \
to
be
adjusted
by
finger-pusihing
up
or
down
(side view] ; d
Loosen the screws and adjust the height of mgtor pulley so
that take-up idter makes contact with the pulley as shown.
(side view}
Take-up Idler Height Adjustment
in FAST FORWARD mode
take-up reel table
Adjust by bending this crank
motor pulle
P e up or down with pliers.
(side \->w)
t
the
bottom
side.
.
Spore
eee”
Adjustment
locations
Shifter
Adjustment
;
in
FORWARD
mode
Head
Deck
Position
Adjustment
In
forward
mode,
there
should
be
the
clearance
of
0.4~1.0mm
(Yea~
ha)
in
FORWARD
mode
as
shown.
In
fast
forward
mode,
tape
should
not
contact
heads.
pinch
lever
Make
the
adjustment
with
sleeve
attached
to
capstan
and
without
sleeve.
Loosen
the
screw
and
adjust
by
positioning
shifte.
Loosen the screws and adjust the position cf head deck.
(top view)
04~1.0mm
($4364)

42. ADAPTATION TO DIFFERENT POW
LINE FREQUENCY (AEP, E)
From 50 Hz to 60 Hz
ER
Set the power frequency selector switch to 60 Hz
and remove the capstan sleeve.
From 60 kz to 50 Hz
Set the power frequency selector switch to 50 Hz
and put on the capstan siseve.
selectcr switch
Power frequency selector switch
__. power frequency
capstan sleeve
remove | puton
for GO Hz for 3D Hz
capstan
Capstan sleeve

43. ELECTRICAL ADJUSTMENTS
C603 BIAS ADJ {(L-CH}) = R121 5k (8) REC LEVEL ADJ (L-CHi
C604 BIAS ADJ {(R-CH] LIQt REC EZ ADS (L-CH)}
fig ag
£303 DUMMY
COIL ADJ
(L-CH)
£304
DUMMY
COIL
ADJ
{R-CH]
L201 REC EQ ADJ {(R-CH})
R221 5k82 (8) REC LEVEL ADJ {R-CH)
Fig. 4-3-1 Adjustment location
zenith sdjusting screw,
rec. head
azimuth adjusting
screw, 9.0, head
azimuth adjusting screw, rec. head
height adjusting screw, ec, head
Fig. 4-3-3 Adjusting screws
&: wrong
b: good
Fig. 4-32 Adjustment location Fig. 4-3-4 Core setting of L101 (L201)

&@ 100kN remsior
noies $ After ce adpouments, apply lock paint to the parts adjusted 7. Bus voltages acrow the heeds viv '
;
‘
)
should
be
read
L
Refore
making
the
adjustments,
be
sure
to
clean
tre
heads
wath
chth
of
swad
dampened
with
denatured
acobol
&
The
folowing
test
equipment
is
to
be
umd
for
the
adjuster
tt:
pars
heal
ootex:
tose
19
alg
an
,
M
as
folinm.
and
to
demagner
the
record
and
playback
heads
mth
a
head
deragnenier
SONY
HE-2)
@
audw
sgnal
generator
: 7
14
volts
at
9S
cas
(3%
3
2.
The
adjustments
should
be
made
uv
numencal
order.
tz
atweruator
6002
12
volts
a¢
4.6
ons
(1%
ips)
rv
The
adjustments
ould
be
mode
at
F2
ems
17%
upss
tape
speed
except
the
item
3.
&
SONY
adjustment
wpe,
-19F1
&
119-2
~
:
yoack
Head
Azimuth
1G
kHz,
3rd
tone
of
SONY
adjust-
VTVM
and
100kqQ
resistor
in
PLAYBACK
playback
hehead
azimuth
:
Retna
ae
ment
tape,
J-19-F2
parallel
with
LINE
OUT
jack
adjusting
scscrew
MONITOR
switch:
TAPE
See
F
Fig.
4-3-3.
Pl
ey
Level
Adjust-
|
400
Hz,
Ist
tone
of
SONY
adjust-
;
;
L-CH:
RCH:
eae
and
Level
Meter
|
ment
tape,
J-19-F2
VTVM
and
100k2
resisto?
in
PLAYBACK
i
Ries
Rees
(20k2;
B)
R185 R285 (5k2; B)
parailel with LINE OUT jack
See F Fig. 4-3-2.
Calibration
MONITOR
switch:
TAPE
R-CH:
2ka (B)
See F Fig. 4-3-2.
|
SONY
adiustment
tape,
J-19-F2
3.
Playback
Equalizer
|
MONITOR
switch:
TAPE
:
|
1
Adjustment
(1)
19
ems
£7'4
ips)
VIVM
and
100k
resistor
ia
|
|
|
|
|
H
ol
ee,
eee
parallel
with
LINE
OUT
jack
|
PLAYBACK
LCH: Rk163 RCH: R263
3k2 (B)
See FFig. 4-3-2.
i
et
:
SONY
adjustment
tape;,
J-9-F1l
a
(2)
9.5
cm/s
(3%
ips)
MONITOR
switch:
TAPE
4.
Bias
Trap
Coil
VTVM
to
test
point
and
ground
—
LCH:
oe
as
L302
BIST
nES
Gow
Frig.
45-1.
See page 25, TP)
record
heaad
height,
zenith
and
RECORD
azimuth
addjusting
screw
See
|
Fig.
4-3-3.
VTVM
and
100kq
resistor
in
5.
d
Height
|
1
kHz,
-60
dB
(0.78
mV)
to
MIC
ee
a
Bet
:
parallel
with
LINE
OUT
jack
Adjustment jack
INPUT SELECTOR:: MIC
record heaad azimuth adjusting
VTVM
and
100kn
resistor
in
RECORD
screw
eas
parallel
with
LINE
OUT
jack
See
|
Fig.
4-3-3.
15 kHz, -90 dB (24.5ysV) to MIC
jack
INPUT SELECTOR’: MiC
6. Record Head Azimuth
Adjustment
LCH: Creo3 RCH: C604
RECORD
|
30—200pF
i
See
Fig.
4-3-1.
VTVM
and
100kq
resistor
in
parallel
with
LINE
OUT
jack
Fs
1
kHz,
60
dB
(0.78
miV)
to
MIC
jack
INPUT
SELECTOR’:
MIC
f° 7. Record Bias Adjustment | ja
|
L-CH:
R121
R-CH:
R221
VTVM
and
100ka
resistor
in
RECORD
5k
(B)
parallel
with
LINE
OUT
jack
See
Fig.
4-3-1.
1 kHz, -60 dB (0.78 mnV) to MIC
jac
§. Record Level Adjustr:ent
INPUT SELECTOR?: MIC H
L-CH:
ae
R-CH:
L201
VTVM and 100ka resistorin | RECORD -8/1.45 mH
parallel
with
LINE
OUT
jack
See
Fig.
4-3-1.
Ik,
20
kHz,-90
dB
(224.5nV)
to
MIC
jack
INPUT SELECTORR: MIC
9. Record Equalizer
Adjustment
VTVi
to
test
point
at
mode
at
mode
RECORD
LCH:
Lse
RCH:
L303
10.
Dummy
Coil
Adjustment
(See
page
25,
TP)
See
Fig.
4-3-1.
Bea
Adjust the screw to obtain maximum reading on VTVM.
ye wn
[ed
MOA f wpe
Mee NS
Wn we
. ee
1.
2.
Deviation against the level at 400 Hz of 3rd tone
beiit vad aaay Dae il
Tne
SOS
twitch
and
the
NOISE
SUPPRESS
tentcn
whould
be
set
m
OFF
pounon.
a
VIVE
erase
bead
appida.'420
Procedures and Remarks
Adjust Risé (L-CH) and R266 (R-CH) to obtain 0dB(0.775V) on VTVM.
Adjust R1g5 (L-CH) and R2gs (RCH) so that pointers of level meters stay at 0 VU (100%).
7kHz | 40Hz | tz
+2.042 dB
+3,0+2 dB
6th
| 200Hz | Hz | soHz | Hz
[+242 dB dB | +0.542 dB | dB
[42.522 dB | +1082 8 |
Set the REC VOL controls (R135 & R235) to minimum.
Adjust to obtain minimum reading on VTVM.
Turn the three screws (height, zenith and azimuth adjusting) so that the record head will be
visually horizoatal.
Set the MONITOR switch to TAPE.
Turn the height adjusting screw to obtain maximum reading on VTVM.
Memorize the number of turns.
Turn
the
zenith
and
azimuth
adjusting
screws
the
same
number
of
turns
of
height
adjusting
screw.
Follow
the
steps
3
ard
4
to
obtain
maximum
reading.
Set the MONITOR switch to TAPE position.
Turn
the
azimuth
adjusting
screw
to
obtain
maximum
reading
on
VTVM.
Within
one
turn
of
the
screw,
the
maximum
reading
should
be
obtained.
If
not,
repeat
the
adjustment
as
in
the
item
5.
Set the MONITOR switch to TAPE position.
Turn
the
trimmer
capacitors
counterclockwise
and
set
them
in
minimum
capacitance
positicr.
Recording
the
signal,
turn
the
trimmer
capacitor
(C603,
L-CH)
clockwise
slowly
until
the
VIVM
reads
the
maximum
vaiue,
Continue
to
turn
the
capacitor
until
the
VTVM
reads
a
value
0.5
dB
below
the
maximum
reading.
Read
the
VI'VM
reading.
Adjust the trimmer capacitor (C604, R-CH) in the same way.
Make
sure
that
the
reading
of
L-CH
is
the
same
as
the
one
reading
in
the
step
4.
If
not,
follow
the
steps
2-6
again.
Set the MONITOR switches (S105 & S205) to SOURCE position.
Feeding
the
signal,
slide
the
REC
VOL
controls
(R135
&
R235)
so
that
the
level
meter:
indicate
0
VU
(100%).
Record the signal on a blank tape.
Set the MONITOR switches (S105 & S205) to TAPE position.
Adjust R121 (R221) so that VTVM indicates 0 dB (0.775V).
Set the MONITOR switches (S105 & S205) to TAPE position.
Record
an
|
kHz
signal
of
-90
dB
(24.5uV)
ona
blank
tape
and
read
the
VTVM
reading.
Record
a
20
kHz
signal
of
-90
dB
(24.5yV)
and
adjust
Lioi
(L201)
so
that
VTVM
reading
ts
the
same
as
the
one
of
|
kHz
signal.
Note:
Two
peaks
appear
during
turning
L101
(L201).
Take
the
peak
where
the
core
is
“bd”
position
shown
in
Fig. 4-3-4.
Set the REC VOL controls (R136 & R238) to minimum.
Kead the VTVM readings of both channels.
Set the machine in L-CH RECORD mode.
Adjust
L304
so
that
VTVM
reading
is
the
same
as
the
one
reading
in
the
step
2.
Set
the
machine
in
RCH
RECORD
mode
and
adjust
L303
in
the
same
way.

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7. Switch posivons are as per the foltowing table:
Description
! Sam 2 a.
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Thos
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switch
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speaker
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1
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Voltage
values
are
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2
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2.
All
resistors
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capacitors
are
rated
in
Nand
pF
reszectivety
PLAYBACK
and
RECORD
modes
st
the
speed
of
7%
Ips
ON(E,
AEP,
UK)
OF
F
{USA
Consda)
4
motels
untess
otherwese
specified.
{19
mA}.
Variabons
may
be
noted
due
t
normel
pro-
|
ONIE.AEP.UK)
OFF
(USA
Canada)
ara
ee.
@uction
tolerances.
Voltage
values
in
RECORD
mods
are
;
ON
(E,
AEP,UK)
OF
F
(USA,
Canada?
4.
Reustor
whose
rating
value
is
suffixed
with
the
letter
(N)
in
parentheses.
Shoal
alg
cla
x4
3
z
ert
13 low noae resator.