Sony TC-377 User manual

Power Requirements:
Power Consumption:
Bias Frequency:
Track System:
. Reel Size:
Tape Speed:
Frequency Response:
19 cm/s (71/2 ips):
s ips):
9.5 cm/s (33/4 ips):
19em/s (74
19cm/s (74/, ips):
19 cm/s (if, ips):
9.5 cm/s (3% ips):
4.8 cm/s (1% ips):
Signal-to-Noise Ratio:
Distortion:
Wow and Flutter:
SONY-00124
AEP
Model
—
_..
AUS
Model
USA
Model
STEREL
SPECIFICATIONS
AC 120V, 60Hz (Canada, USA)
AC
100V,
110V, 117V,
125V,
220V,
240V,
50/60
Hz
{E)
AC 110V, 127V, 220V, 240V,
50/60 Hz (AEP, AUS)
38W (Canada, USA)
48w (AEP, E, AUS)
Approx. 160 kHz
Four
track
two
channel
stereo
and
mono
7" maximum
19 cm/s (71/2 ips)
9.5 cm/s (35/4 ips)
48 cm/s (17 ips)
SPECIAL (SONY SLH tape)
NAB . DIN
20~30,000
Hz
30~24,000
Hz
30~25,000 Hz +3dB
30~20,000Hz.—=—-—.—«c
40~16,000
Hz
NORMAL (Standard tape)
NAB DIN
20~25,000
Hz
30~20,000
Hz
30~20,000
Hz
+3dB
.
30~17,000
Hz
40~
13,000
Hz
30~9,000 Hz
NORMAL SPECIAL
52
dB
or
better
55
dB
or
better
1.2%
.
19
cm/s
(71/2
ips):
0.09%
(RMS)
weighted
9.5
em/s
(334
ips):
0.12%
(RMS)
weighted
4.8
cm/s
(17
ips):
0.17%
(RMS)
weighted
Inputs:
Two
MICROPHONE
inputs
Impedance: fow impedance
Maximum sensitivity: -72dB (0.2 mV)
Two LINE !Nputs
Impedance: 100kQ :
Maximum sensitivity: -22dB (0.06V)
REC/PB connector (AEP, E, AUS)
Input impedance: 3.8k2 —
Outputs: Two LINE OUTputs
;
Load
impedance:
more
than
10kQ
Output
level:
OdB
(0.78
V)
with
100kQ
load
REC/PB connector (AEP, E, AUS)
Output impedance: 3.3kQ
HEADPHONE output
Load impedance: 8%
Semiconductors:
23
transistors,
5
diodes
Record
Head:
RF140-2902
(7029/1
kHz)
Playback
Head:
PF
140-4202
(1k2/1
kHz)
Erase
Head:
£F18-2902A1
(1.6k0/160
kHz)
Motor:
1C-624H1
(induction
motor)
Dimensions: 418 (w) x 210 (h) x 392 (d) mm
16Y> (w) x 85/16 (h) x 15716 (d) inches
Weight: 10.6kg, 23Ib 60z (Canada, USA)
11.5kg, 25 lb 6oz (AEP, E, AUS)
"SERVICE
MANUAL

TABLE OF CONTENTS
Section Title , Page
SPeCiICALION - S.csesegccscessciseassousececcadececectetasveabiacsesses . oeenecs osTue Genta tusbeaconteensaets 1
1 OUTLINE
Pets BlOCK: “Diagrai <c.pscse cise cc descsedicesetccvassscconscudesaesocce ov cdsicecccvssessbeseotoaded . 3
1=2:, External “Views ..scccccccsssesissiceccscsecseseossecdseseoseecacacdbicssscceocececsvesecsedeces 4
1-35. “Int€rnial ViCWS» “asicesisioss sesacsetaceadsccssecesscsctesdesascsvcocssdsscecudsosveveucuuuccest 5
2 DISASSEMBLY oo... ds diag taibaieaca es eiheecleiuana tne etaeae: 6
3 ADJUSTMENTS
3-1. Mechanical Adjustments shdbbds Waddedeeesdeesewe site iebebeedhds ces enbwce eave eats 9
3-2. Electrical Adjustments/Measurements ...........scssecececcsecceecceecscaconeees 16
3-3. Power Frequency Adaptation oc. icceesesssssecesssessssececssensececsesones 28
4 DIAGRAMS |
4-1, Level Diagrams waccecccccsccecsccceccccceceselecsescscscssceseseeccecusessersucerseacesasaves 29
4-2. Schematic Diagram 31
4-3. Mounting Diagrams . 33
4-3-1. Tape Select Switch Circuit Board 33
4-3-2. Power Supply Circuit Board oo... eee cesecesegeceseseteseceeeneeees 33
4-3-3. Bias Osc Circuit Board .oo...eeececececccecececececenecececerocseeneenceeees 34
4-3-4. Record Amp Circuit Board ........cecesssescerererecerersseeseeseees 35
4-3-5. Playback Amp Circuit Board ......ssssscsscsceeesseensensceteeescsens 36
5 EXPLODED VIEWS
5-1, Cabinet — top VicW ~ wieciccsccscsecsesssessesensececesseesecesestsssseecseeneeseeees 37
5-2. Head Deck — top view — 38
5-3. Amplifier Chassis — top view — 39
5-4. Chassis — top View — oiiecccccceccseceesensseserececececeecsneetes ane 41
Dede: - PACKING cccs2 sbveccweseasseSeannd svadsscouade susesdatwued doinds tances teteets cotooiauacesteseaane 43
6 ELECTRICAL PARTS LIST oui ceccccssceessesssccecssneecesseeteseseeneesans 44
7 HARDWARE. cain sccsiccsssecusteevecccusss laccaventicesstsccddcscvetesentesdsitvevscsutesacevaceouense 47
Hardware Nomenclature ooo... ccceescssscecssscceeseessscectenensecesnceecsccesceeseneaee 47
When ordering replacement parts, use PART NUMBERS listed in
Parts. List.or shown in EXPLODED VIEW.
. Parts List reference numbers should not be used.

MAJOR PARTS LOCATION
‘o S a. -_ = fe) J
rs
1-2.
SECTION 1
OUTLINE
BLOCK DIAGRAM
1-1.
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(Canada)
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SONY-00124/DRUCK1

SECTION 2
DISASSEMBLY
1-3. INTERNAL VIEWS
2-1. BIN
Chassis
Front
CA
ET
REMOVAL
function selector
head cover nob
“B3x14
W3
mm
dia—.
,
W3
mm
dia
:
function
selector
head
cover
pin
knob
X-34720-27-0 PAUSE button
A}
ass‘y,
tention
1-514-231-11
:
:
F
RECORD
VOLUME
am
ise
¥
switch,
micro;
bias
ose
($108)
.
(Turn
clockwise.)
wae
]
knob
RK
aa
©
ae
ornament,
screw
RK
3x14
1-5
tay
o
-00
ide
MONITOR
washer,
nylon;
3.2mm
dia
‘
139-12
switch,
lever
slide;
:
B3x14
ornament,
screw
1-514-0
(L-CHANNEL)
(S103)
washer,
nylon;
3.2
mm
dia
switch, micro; auto
shut-off
(S1
70)
W3
mm
dia
1-514-640-00
jack
insulating
washer
switch,
lever
slide;
MONITOR
(R-CHANNEL) ($104)
1-514-655-31 (E)
1-514-472-21 (AEP, AUS)
1-516-655-71 (Canada, USA)
1-514-641-00 aa? "+ switch, seesaw, POWER (S109)
switch, lever slide; en ioe a lide; - :
MIC
ATT
(S117)
TAPE
SELECT
{S102}
Bes
RK
4x50
RK
4x50
Chassis
Rear
;
.
1-117-034-
Be
ae
Qe
a
:
ob
capacitor,
i
i
a
a
eae
ee
(C707)
retaining
washer
"2
Oe
washer
1-117-036-22
.
cabinet
rubber washer
capacitor,
1.5
pF
+0.5
uF
250V
metalized
poner
(C707)
(AEP, AUS, E.
1-44 1-997-11 (USA)
1-441-944-11 (AEP, AUS)
1-442-068-00 (Canada)
1-441-959-00 (E)
transformer, power (T7017)
X-35180-53-1
complete circuit board,
power supply
Gum-(6
RK 4x45 RK 4x4
8-832-624-22 (AEP, AUS, E, USA) |
8-832-624-27
{Canada}
retaining
washer
motor,
1C-624H1
‘
retaining washer
LEVEL
ADJUST
.
cabinet
1-514-643-00
1-514-644-00
switch,
rotary;
muting
switch,
rotary;
equalizer
(S101)
(S107)
ha
back
cover
X-35180-52-1 (Canada, USA)
X-35181-52-1 (AEP, AUS, E)
complete circuit board,
playback amp A
X-35180-54-1 (Canada, USA)
X-35181-53-1 (AEP, AUS, E)
complete circuit board,
bias ose
X-35
180.
51-1
(Canada,
USA}
rubber
foot
stopper
X-35181-51-1 (AEP, AUS, E) : : : ?
complete
circuit
board,
‘
:
a
oe
record
amp
:
i :
rubber
foot
(P 4x25 ,
ao
SOs
ee
ey
SONY-00124/DRUCK2

SONY-00124/DRUCK3
2-2. HEAD DECK REMOVAL
P 3x6—_,¢
SW 3mm dia___,._,
W3mm dia——>"
head holding plate ass’y
P 3x6
SW 3mm dia
W3mm dia
PAUSE stroke
adjusting plate
CAUTION
(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 will 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
transistor Q601 will be broken.
(3) When removing PAUSE button, turn it clock-
wise.
(4) Turn on the power switch after being certain
that the motor fan does not touch anything.
7 | head deck ass’y

-SECTION 3
ADJUSTMENTS
3-1. MECHANICAL ADJUSTMENTS
Precaution:
Do not use magnetized screwdriver for adjust-
‘ments, - oh Oe mS
After adjustments, apply locking paint to the
adjusted parts. —
Tension Regulator Adjustment
STOP mode
1. Loosen the adjusting screw and adjust so that
the clearance shown is 8 mm (5f6”) after
having been turned reel table counterclockwise
by hand. ,
supply reel table
tension regulator
adjusting screw. arm pin
tape guide
tension regulator pe g}
‘arm eh
locus drawn
by pin movement 7.5~8mm erase head
2. Tape should be in contact with tension regu-
lator pin uniformly at beginning and end
portion of it.
tension regulator pin
tape
tension regulator arm
SONY-00124/DRUCK4
Tension Regulator Back-tension Adjustment
FWD and FF modes :
This adjustment should be done after Tension
Regulator Adjustment. o
Use 7” reel tape.
in FWD mode 45~ 559g ;
: (1.59 ~ 1.94 oz)
in FF mode 15~ 20g
(0.53 ~ 0.71 oz)
stud ‘
“spring
@ é ' tension regulator
f tension gauge
arm pin :
Adjust by changing the spring hook position.
If necessary, adjust by bending the stud or perform
the tension regulator adjustment again.
Pinch Roller Pressure Check Pinch Roller Stroke Adjustment
STOP mode 1. .
1. Remove head deck: ass’y. (See “HEAD DECK 2:
REMOVAL?” on page 7) .
2.
Put
dummy
capstan
into
capstan
bearing
and
be
sure
that
the
‘clearance
between
pinch
levers
3,
@®
and
is
approx.
0.5mm
(1/64").
pinch lever
Remove head deck (See page 7).
Loosen adjusting screw @ so that pinch roller
shaft comes in contact with retractive lever at
position @) in STOP mode.
Fix adjusting screw @ while pushing the joint
lever in the direction shown by arrow.
4.. Put the dummy capstan into the capstan
bearing and be sure that pinch roller shaft
moves by approx, 3~4 mm (1/g~4/32") on the
surface of retractive lever when function
selector knob is changed from STOP to FWD.
5. Be sure that the washer on pinch roller shaft
does not come in contact with © position
when function selector knob is changed slow-
ly from FWD to FF.
capstan
pinch lever (A)
retractive lever
head deck —back view—
3. . Be sure that the tension gauge indicates 800~
1,000 g (1 lb 12 0z~21b 30z) when the pinch
roller is detached from capstan in FWD mode.
adjusting screw @)
joint lever
800 ~ 1,000g
(1/b 1202 ~21b 302)
retractive lever
head deck —back view—
pinch roller shaft
©
Bias Switch Position Adjustment
: Peay : (] '
Loosen
two
screws
and
adjust
by
positioning
the
.
Oe
ieee
switch.
;
yf
i
é 2 ~w) beer
Switch
should
be
turned
ON
in
FWD
mode,
i
il
sd
pl
seid
and with function selector knob: changed slowly aid 3~4mm (e~%fs2")
from FWD to STOP, record levers are released after
the switch turns OFF.
lin FWD mode) fin STOP mode)
(bias ose switch
$108)
Head deck bottom view.

7H
+
PAUSE Adjustment : . Capstan Idler Position Adjustment
STOP
mode
Me oc
This adjustment should be done after tension
regulator adjustment.
FWD mode
. motor. pulley 48cem/s (17 ips)
to be flush :
g 9.5cem/s (34 ips)
To contact = ee = “ aa
1. Adjust screw @® so that the distance between
? at center SJ oe ee
the end of PAUSE pull rod and PAUSE stroke
adjusting plate is 4~5mm (%2"~3/6") in
STOP mode.
ef . flywheel
ese
19cm/s_ to be some
(71/2 ips) Clearance
ty
Be sure that the clearance between pinch roller
i}
i
|
i
and
capstan
is
more
than
{
mm
(1/32)
when
aay
pulling
the
PAUSE
lever
in
FWD
mode,
and
-|
i
|
1mm
(Yea)
PAUSE
button
is
not
locked
when
pulling
it
|
|
|
in
STOP
mode.
1
|
3.
Adjust
screw
(B)
so
that
the
clearance
between
|
|
tension
regulator
arm
and
PAUSE
leaf
spring
aa
0
is
2~3
mm
(1/,")
in
STOP
mode.
Brake
should
|
|
|
fic
tie
z
sy
work,
when
pulling
the
PAUSE
lever
in
FWD
|
c
Pie
leler
Be
a
mode. : i | loosening the screw. ©
| ae
screw
4~5mm
i
ij
After
adjustment,
capstan
idler
should
not
come
(h2~he”)
PAUSE
pull
rod
in contact with flywheel and 60 Hz motor pulley in
; STOP mode and the clearance between capstan idler
and 50 Hz motor pulley is more than 3mm (}/g") in
i STOP mode.
capstan idler
|
i
f
i
t
“Idler Arm (C) Stroke Check —
FWD mode
At 4.8 cm/s (17/g ips) tape speed:
PAUSE stroke Head deck bottom view.
adjusting plate
tension regulator
PAUSE lever arm
Shut-off Mechanism Adjustment
STOP
mode
leo
pet
Sl
Hi
1
is
more
than
0.6
mm
(1/4"
iS
aes
ee
ee
|
50Hz
|
clearance
is
more
than
0.6mm
(
Yea")
_|
earance
i
r
(%4")
1
|
L
sot
|
Speed Selector Cam Position Adjustment 1. Loosen two screws (A) and adjust by position- 2. Adjust screw (@) so that the clearance between | | some clearance
FWD mode ing the shut-off lever holding plate ass’y so that shut-off levers (B) and (H) is 0.3~0.6mm } ;
Loosen the screw and adjust to locate the idler the shut-off mechanism is locked when the (444") in STOP mode.
clearance between the shut-off arm end and
head deck is 6mm (15/64”), and shut-off
mechanism is released completely when it is
(64).
arm pin in the stopper slot (2) shown, at 19 cm/s
tape
speed,
.
clearance .
capstan
idler
cabinet
a
head
deck
7mm
(3/64)
(bottom
view)
shut-off
lever
(H)
adjusting
screw
@
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
i
|
|
|
|
. ~ scrape flutter filter roller
adjusting screw @: lock
y
i
i
equalizer | 6mm SSS }
:
i
ne
adjusting screw { .
; dler arm pa | | Scrape Flutter Filter Roller Check
/
of
idler
arm
(C}
ass’y
shut-off
lever
holding
FWD
mode
|
| plate ass’y _ At 4.8cm/s (17/g ips) tape speed
|
shut-off
mechanism
:
.
To
contact
the
tape
sufficiently.
|
release |
—11— : : 2 ve — 12—
SONY -00124/DRUCKS.

FF and REW Torque Adjustment
FF and REW modes
Adjust by changing the position of leaf spring to
obtain the specified values on torque meter. (Read
the values when driving idler is forced to stop the
motion.)
3 FF idler
leaf spring
driving idler
in REW mode in FF mode
1,000~1,400g-cm
(14~18 oz-cm)
{Reel Table Height Adjustment
FWD, REW & FF modes
1. Adjust the height of reel table by adding or
' removing the adjusting washers (@ ‘ ) so
‘that tape does.not come in contact with reel
flange in FWD, REW & FF modes.
2. Perform tension regulator back-tension adjust-
ment on page 9 and FWD torque adjustment. ©
approx,
35mm (13/3”)
ial = en
— rer
‘lower adjusting washer.
1,000~1,400 g-cm
(14~18 oz-inch)
FWD Torque Adjustment
Adjust
FWD
torque
by
turning
the
screw.
200~ 240 g.cm
(2.8~3.3 oz.inch)
torque meter
FF and Driving Idler Height Adjustment
STOP mode
supply —
reel table
<F
© nylon washer
take-up
reel table
SONY-00124/DRUCK6
se ane (6.96~10.4 oe.inch)
torque .
Brake Adjustment
STOP mode
take-up brake
torque
ciation
© |
j
400~550
g.cm
direction
C
(5.56~7.65
oz.inch]
ef
wastes
1,600
~2,200
g.cm
(22.2 ~30.6 oz.inch}
2) take-up brake
adjustment in the
direction shown
hae
1,000~1,800
g.cm
(13.9~25
o2.inch)
take-up reel table \
supply by arrow C.
reel table } strong
(C>4—— lever
{ weak
WHat
Adjust the supply brake torque by
expanding or contracting the pitch
of the spring.
brake lever ip
1) Adjust by: eng the |
: i Trew. i
tension regulator arm ; aa own Win ( ve enna
MR ~%h").
(S) lever al
3) take-up brake torque adjustment in the
direction shown by arrow D.
e@ When the meter reading is more than
the specified value, bend the ‘lever
in the direction shown by arrow.
© When the meter reading is less than the
specified value, cut off one turn of
the spring end and hook the ‘spring. .
7.5~8mm (5/6”)
in STOP mode
After having performed the tension
regulator adjustment on page 9, make
the supply brake torque adjustment.
Tape Slack Check
Place the machine in vertical position and thread
tape
with
7”
reel.
Be
sure
not
to
slack
the
tape
in
the
following
REW conditions.
|
peor end portion of REW — STOP
tape (Fig. A)
7” reel | beginning of
tape
FF beginning of Pull PAUSE lever in
| tape FWD mode at 19 cm/s
(7/2 ips),
STOP
FWD — STOP
at 4.8 cm/s (17/g ips)
(Fig. C)
beginning of ©
tape
7" reel
FWD (4.8cm/s)
STOP

Flywheel Brake Check
REW mode
, take-up
reel table
Be sure that flywheel brake
comes in contact with fly-
wheel in REW mode.
flywheel .
Tape Speed Adjustment
1. Playback SONY speed check tape (SPC-47)
at 19 cm/s (7% ips) tape speed in horizontal
position. "Read digital frequency counter
connected to LINE OUT jack. -
2. If the counter reading is out of 3,960~
4,040 Hz, replace with the motor pulley with
identification mark shown below.
(As for part No. of motor pulley, refer to page
28.) ;
SONY speed check tape SPC-47
no signal 4kHz ee) signal
4 min. 2.5 min. 26 nae
“deviation -3% -2% -1% 0 +1% +2% 43%
frequency , 3980 4020
on counter 3880 3920 “3960 _, 4000 4040 4080 4120
identification mark #2 +7 70.5 80 -0.5 -1 -2
on motor pulley
19cm/s (7 1f ips)
Deviation (%)
Variation
Limit (%)

3-2. ELECTRICAL ADJUSTMENTS/
MEASUREMENTS
Precaution:
I...Clean- the. following parts with an alcohol
: moistened swab:
record head
. playback head
pinch roller
rubber belts
erase head idlers
capstan tape guides
2. Demagnetize record head and playback head
with a head demagnetizer.
3. Do not use magnetized screwdriver for adjust-
ments,
4. After adjustments, apply locking paint to the
adjusted parts.
5, Adjustments should be performed in the order
given in this service: manual.
6. Adjustments and. measurements should be
performed for both L-CH and R-CH with rated
' power supply voltage unless otherwise specified.
Test Equipment/Tools Required:
audio oscillator (af osc)
VTVM
400 Hz bandpass filter
attenuator (6002)
non-magnetic screwdriver
wow meter
distortion meter
oscilloscope
resistOrs ......... 6002 (4W), 3002 (AW)
10k2 (4W), 100k2 (4W)
SONY test tape
J-19-F]
"CEP EER z
ever esi] 10] 0] v0] 10] “i0] “io 0
blank tape (completely erased with bulk eraser)
| SONY super 150 ,
SONY SLH
Note: When connecting the measuring equip-
ments to the input or the output jack
of the machine, take the impedance
matching correctly.
| mon wl
Rated Output Level!
(Load impedance)
Rated Input Level
{Input Impedance)
MICRO- {| -60 dB, 0.78 mV
PHONE (6002) LINE
LINE | -10dB,0.25v | OUT
IN (10k)
RECORD VOLUME control should be set as follows
unless otherwise specified.
LINE RECORD VOLUME
Position to obtain 0dB (0.78 V) LINE OUTput for
1kHz, -10dB (0.25V) LINE INput with MIC
RECORD VOLUME set to the minimum position
and MONITOR switch set to SOURCE position.
MIC RECORD VOLUME
Position to obtain 0dB (0.78 V) LINE OUTput for
1kHz, -60dB (0.78mV) MICROPHONE input
with LINE RECORD VOLUME set to minimum
position and MONITOR switch set to SOURCE
OdB, 0.78V
(100k)
position.
af osc
VTVM
70kQ. (for
©
|
.attenuator
LINE
IN
only)
199
kQ.
ze)
“O—=o O =
stood? = Fe
[ |
60022 WicROPHONE ‘LINE OUT
1 kHz, -60 dB (0.78 mV)
LINE IN
1 kHz, -10 dB (0.25V)
Note on replacing the heads:
1. Erase Head Removal
When removing the erase head from the
head deck, remove the two screws shown
with 4.
(Do not remove the three screws shown
below x)
. Record or P.B. Head Removal
When removing the record or the p.b. head,
remove the respective angle adjusting screws.
(Do not turn the screws saree the angle
adjusting screws.)
angle
adjusting
screws
playback
head
record head
erase
head
angle
adjusting
screws

record head
A. Tape Guide (left) Adjustment
tape guide {(L)
lock
screw
35°
playback head
_, record head —
Procedure:
Thread a tape and place unit in playback mode.
Loosen the lock screw and align the upper edge
of the erase head core and that of the tape by
turning tape guide (L).
Turn tape guide (L) clockwise by approx-
imately 35 degrees from the position obtained
in the preceding step so that the upper edge
of the tape is approximately 0.05 mm (2 mil)
lower than the upper edge of the erase head
core,
Fix the tape guide with the lock screw.
Adjustment Location:
zenith adjusting
screw -
zenith adjusting
screw
B. Record and Playback Head Preadjustment
(Rough adjustment for Playback Head Angle
Adjustment and Playback Head Azimuth Adjust-
ment) :
Note: This adjustment and the following adjustments (Play-
tape guide {Lj
* ae see
back Head Angle Adjustment and Playback Head
Azimuth Adjustment) should be repeated alternately
several times.
tape guide (R)
erase head record head Playback head
= [= S )
0.025 mm
Procedure:
if Align the upper edges of record and playback
head cores and that of the tape by evenly
turning the record and playback head height
adjusting screws.
Turn record and playback head height adjusting
screws clockwise by approximately 15 degrees
so that the upper edges of record and playback
head cores are 0.025 mm (1 mil) lower than
that of the tape and memorize the angle of
turns.
Turn zenith adjusting screws by the same angle
of turns to the same direction of record and
playback head height adjusting screws.
Thread SONY tape super 150 or PS-2 and place
- unit in playback mode at 19 cm/s (7% ips).
Make the tape loose a little by pushing the
tension regulator arm pin in the direction
shown by arrow and then adjust playback head
and record head zenith adjusting screws to
obtain the reflection of light as shown.
tension regulator
arm pin
reflection
of light

2. Tape Curl Adjustment
tension regulator
arm pin
capstan
tape guide (L) tape guide (R} bearing
EH
wron
9 screws good
tape 4
A
tape guide tape guide
Procedure:
1.
Thread SONY tape super 200 (thin tape) and
place unit in playback mode at 4.8 cm/s
(17/g ips) tape speed.
Be sure that the tape comes in contact with
two tape guides exactly as shown.
a) If tape is curled at tape guide (L), adjust by
bending tension regulator arm pin with
fingers.
b) If tape is curled at tape guide (R), loosen
two capstan bearing holding screws and
adjust by adding or removing the mylar
spacer,
Note: After adding or removing the mylar
spacer (0.1 mm thick), perform play-
back head zenith adjusting screw. (See
“Record and Playback Head Preadjust-
ment” on page 17.)
aD
mylar spacer
3. Playback Head Angle Adjustment
Control/Switch Setting:
TAPE SELECT switch: NORMAL
TAPE SPEED selector: 7% ips (19 cm/s)
MONITOR switch: TAPE
Procedure:
1. Mode: playback
J-19-F1 .
(1st tone 10kHz)!
LINE OUT
Adjust angle-adjusting screws for maximum
VTVM reading.
Apply back-tension by holding lightly the
supply reel table, reproducing the alignment
tape, and then adjust the angle of the head
by loosening two angle-adjusting screws so that
VTVM reading on both L-CH and R-CH does
not rise. -
Note: Unless playback head is installed at
correct angle, VTVM reading will rise.
angle adjusting screws
playback head
— 18 —

4. Playback Head Azimuth Adjustment
Control/Switch Setting:
TAPE SELECT switch:
TAPE SPEED selector:
MONITOR switch:
‘NORMAL
7% ips (19 cm/s)
TAPE
Procedure:
1. Be sure that playback head is fixed sufficiently
to head deck with holding screw as shown
below and tape path adjustment has been made.
2. Mode: playback
J-19-F1
(1st tone 10kHz)
LINE OUT
Adjust azimuth adjusting screw for maximum
VTVM reading.
Note: If azimuth angles of L-CH and R-CH
are not the same, set the screw midway
between two screw positions.
Adjustment Location:
azimuth adjusting screw
holding screw
playback head
5. Playback Head Phase Check
Control/Switch Setting:
TAPE SELECT switch:
TAPE SPEED selector:
MONITOR switch:
Procedure:
1. Mode: playback _
J-19-F1
{1st tone 10kHz}
J-19-F1
(3rd tone 400Hz)
L-CH
NORMAL
7% ips (19 cm/s)
TAPE
oscilloscope
100k
LINE OUT
On the On the oxsitoscore
208 |
(4008) (4008) | good
p wrong
Note:
If
necessary,
finely
adjust
the
playback
head
azimuth
adjusting
screw.

6. Playback Output Level Adjustment and 7. Playback Equalizer Adjustment
Level Meter Calibration Control/Switch Setting:
TAPE SELECT switch: NORMAL
. TAPE SELECT switch:- NORMAL ‘TAPE SPEED selector: 7% ips (19 cm/s)
TAPE SPEED selector: 7% ips (19 cm/s) MONITOR switch: TAPE
MONITOR switch: _ TAPE
Control/Switch Setting:
Procedure:
Procedure: 1. Mode: playback
‘
:
k
J-19-F7
:
Moder
playbae
3rd
tone,
400
Hz
J-19-F 1
(2nd tone, 400 Hz)
—
:
LINE
OUT
Memorize VTVM reading.
LINE OUT ,
2. Mode: playback
: J-19-F7
Adjust R316, R416 for 0 dB (0.78V) VIVM 4th tone, 10 kHz
reading.
Adjust R327, R427 for 0 reading on RECORD
LEVEL meters.
Change TAPE SELECT switch to SPECIAL
"
UT
and
be
sure
that
VITVM
reading
is
-2
dB~
LINE
O
-3 dB (0.62~0.55V). Adjust R313, 413 to obtain the same VTVM
reading as in step 1.
Adjustment Location:
Playback the following tones and make sure
: R316. R327 that each tone output level deviation against
playback amp circuit board L-CH L-CH 3rd tone is as follows.
Frequency
(Hz)
Deviation
242dB
=o
from 3rd 0+2dB | 0+2dB
tone
(400Hz)
a
2,.542dB
|
4.5£2dB
Adjustment Location:
R416 R427
R-CH R-CH
= 20S

8. Playback S/N Ratio Check 9. Record Head Azimuth and Track Position
Control/Switch
Setting:
Adjustment
TAPE SELECT switch: NORMAL Control/Switch Setting:
TAPE SPEED selector: 7¥%ips(19 cm/s) | TAPE SELECT switch: NORMAL
MONITOR switch: TAPE TAPE SPEED selector: 7% ips (19 cm/s)
MONITOR switch: | TAPE
LINE RECORD
1. Mode: playback , VOLUME control: See page 16
Procedure:
1-19-F1 Procedure:
2nd
tone
400Hz
1.
Mode:
record
af osc
blank tape
LINE OUT
VIVM reading should be 0 dB (0.78V). If not,
make playback output level adjustment again.
With no tape threaded, keep on pushing shut-
off lever with finger.
Mode: playback
LINE OUT
Adjust azimuth adjusting screw for maximum
VTVM reading. ,
Note: If the maximum value of L-CH and
R-CH outputs can not be obtained at
; the same angle, adjust the screw mid-
Be sure that VIVM reading is less than -48 dB way between two screw positions.
(3 mV). (That value should not be fallen more
than 1 dB from the maximum value.)
LINE OUT
Note:
S/N
ratio
may
change
by
reversing
the
:
sense
of
motor
leads.
.
Supply
a
1
kHz
signal
of
-10dB
(0.24
V)
into
R-CH LINE
IN
jack
and
record
the
signal
on
the
blank
tape.
Adjust
the
height
adjusting
screw
for
maximum
VTVM
reading
and
memorize
the
angle
of
turns
of
the
screw.
Turn the zenith adjusting screw by the same
angle of turns obtained in preceding step 4.
After the adjustment, check-tape path adjust-
ment on page 17 again.
Adjustment Location:
zenith adjusting screw record head
height adjusting screw azimuth adjusting screw

10. Record Head Phase Check 11. Trap Coil Adjustment
Control/Switch Setting: Control/Switch Setting: .
TAPE SELECT switch: NORMAL TAPE SELECT switch: NORMAL
TAPE SPEED selector: 7% ips (19 cm/s) TAPE SPEED selector: 7% ips (19 cm/s)
MONITOR
switch:
TAPE
|
_
MIC
RECORD
LINE RECORD VOLUME control: MIN
VOLUME control: See page 16 x : (fully counterclockwise)
Procedure: , Procedure:
1. Make the playback head phase check on 1. Connect a VTVM across the check point and
page
19
first.
-
:
ground
as
shown.
;
2. Mode: record ‘ : (RECORD AMP CIRCUIT BOARD)
af osc : : VTVM
€) ; blank tape
attenuator
OQ
, Q104
LINE IN (L) and (R) =
1,5kHz, -10dB (0.25V)__—-—
——~
100
ka
oscilloscope
LINE OUT
(L and R)
2.. Place unit in record mode without tape.
3. Adjust L104, L204 to obtain the minimum
| Ai | Cte tens baie Sees si oe . ai a
; ? Adjustment Location:
azimuth :
adjusting ZF (0)
screw
in-phase —_ within 30°
Note: If necessary, finely adjust record head
azimuth adjusting screw.
record amp
circuit board
— 22°—

12. Record Bias Adjustment
13. Record Level Adjustment
Control/Switch Setting:
TAPE
SELECT
switch:
NORMAL
TAPE
SPEED
selector:
7%
ips
(19.cm/s)
Control/Switch Setting:
TAPE
SELECT
switch:
NORMAL
TAPE
SPEED
selector:
7%
ips
(19
cm/s)
MONITOR
switch:
TAPE
MONITOR
switch:
TAPE
LINE
RECORD
LINE
RECORD
VOLUME
control:
See
page
16
VOLUME
control:
See
page
16
Procedure:
1.
af osc
*
fe)
Procedure:
1.
Be
sure
that
trap
coil
adjustment
has
been
Mode:
record
made.
blank tape
2. Mode: record
af osc
€)
blank
tape
attenuator
,
es
O
LINE IN --
1 kHz, -10 dB (0.25V) ~.—— 7
--
LINE IN
1kHz,
-100B
(0.25V),
.—~
-
VTVM
-
LINE OUT
Adjust
R128,
R228
for
0dB
(0.78V)
VTVM
reading.
3.
Be
sure
that
VTVM
reading
is
0
dB
(0.78V)
when
changing
MONITOR
switch
from
TAPE
to
SOURCE
position
and
the
pointer
of
RECORD
LEVEL
meter
stays
at
“0”.
LINE OUT
Turn
the
bias
adjusting
trimmer
capacitors
C503,
C504
counterclockwise
for
maximum
VTVM
reading
and
then
turn
the
capacitor
counterclockwise
so
that
VTVM
reading
drops
0.5
dB
from
the
maximum
value.
;
4.
When
TAPE
SELECT
switch
is
changed
to
SPECIAL
with
MONITOR
switch
to
SOURCE,
VTVM
reading
should
decrease
approx.
1.5
dB.
4.
After
the
adjustment,
be
sure
that
voltage
across
tecord
head
is
approximately
14V
on
VTVM
and
it
decreases,
as
TAPE
SPEED
-
selector
is
changed
to
3%ips(9.5.cm/s)
and
then 17/g ips (4.8 cm/s).
Adjustment Location:
Adjustment Location:
LINE OUT
level
bias
level
;
clockwise
“=
coun
terclockwise
C504
R-CH
record amp
R228 circuit board
Als)
RCH
a
bias osc
circuit board
Da ee

14. Dummy Coil Adjustment
Control/Switch Setting:
TAPE SELECT switch:
TPAE SPEED selector:
MONITOR switch:
LINE RECORD
VOLUME control:
NORMAL -
7% ips (19 cm/s)
TAPE
‘See page 16
Procedure:
1. Mode: stereo record
’ af osc
“s
oO
blank tape
LINE IN a a
20kHz, -30d8 (25mV) cae
LINE OUT (L, R)
Memorize VTVM readings.
Set L-channel (R-channel) only
mode,
in record
Adjust L502.(L501) with non-magnetic screw-
driver, taking care not to break the core, so
that VTVM reading is the same as that obtained
' in step 2.
Adjustment Location:
L502
for L-CH
L501
for R-CH
bias ose circuit board
15. Erase Ratio Measurement
Control/Switch Setting:
TAPE SELECT switch:
TAPE SPEED selector:
MONITOR switch:
.LINE RECORD
VOLUME control:
NORMAL
7% ips (19 cm/s)
TAPE
See page 16
Procedure:
1. Mode: stereo record
af osc
=) attenuator
oo
1000
oO O
LINE IN
400 Hz, OdB (0.78V)
blank tape
2. Rewind half of the recorded part.
3. Mode: stereo record (erase)
rewound portion
no input signal
4. Mode: playback
recorded
portion
400 Hz bandpass
100k. filter
LINE OUT
Specification:
Recorded Signal VTVM Reading
level difference: greater
| erased portion | | erased portion | than 65 dB

16. Overall Frequency Response Measurement 17. Overall S/N Ratio Measurement .
Control/Switch Setting:
TAPE SELECT switch: NORMAL and
SPECIAL
Control/Switch Setting:
TAPE SELECT switch: NORMAL and SPECIAL
TAPE SPEED selector: 7% ips (19 cm/s)
TAPE SPEED selector: 7% ips(19 cm/s) MONITOR switch: TAPE
3% ips (9.5 cm/s) MIC RECORD
and 17/s ips (4.8 cm/s) VOLUME control: See page 16
MONITOR switch: TAPE.
-LINE RECORD Procedure:
VOLUME control: See page 16 1. Mode: record
c af osc
Procedure:
,
blank
tape
eh
1.
Mode:
record
Ye
_
SONY
SLA
af
ose
:
‘plank
tape
ols
attenuator
SONY super 150
Q ‘ius SONY SLH
*Ho00% ;
oO
MICROPHONE
1kHz, -60dB (0.78mvV)
LINE IN
1 kHz, ~-300B {25mv) eee
Mode: record
blank tape
LINE OUT
MICROPHONE
no signal input
2. Level Deviation from 1 kHz signal.
(for both SPECIAL and NORMAL)
ex SO0Hz | 100Hz | SkHz | 7kHz aeons
ex speed
[semis | [semis | £3 dB
+ need
9.5 cm/s a a P
+5 +1
peter —
Note: When recording signal on SONY tape
“super 150”, set TAPE SELECT switch
to NORMAL and on SONY SLH tape,
to SPECIAL.
3. Mode: playback
recorded
portion
LINE OUT
Specification:
Recorded
VTVM
Reading
Signal
NORMAL
SPECIAL
1kHz level difference: | level difference:
greater than greater than
no signal 45 dB 47 dB
Note: When recording signal on SONY tape
“super 150”, set TAPE SELECT switch
to NORMAL and on SONY SLH tape,
to SPECIAL.

18. Overall Distortion Measurement.
Control/Switch Setting:
TAPE SELECT switch:
TAPE SPEED selector:
MONITOR switch:
LINE RECORD
VOLUME control:
Procedure:
1. Mode: record
af osc
19. Cross-talk. Measurement
(between channels)
NORMAL
7% ips (19 cm/s)
TAPE
Control/Switch Setting:
TAPE SELECT switch:
TAPE SPEED selector:
MONITOR switch:
LINE RECORD |
VOLUME control: ©
NORMAL
7% ips (19 cm/s)
TAPE
See page 16
See page 16
Procedure:
1. Mode: stereo record
blank tape
L-CH LINE I.
. N
cd 400 Hz, OdB (0.78 V)
O
O
blank tape
“LINE IN
1kHz, -10dB {0.25 V)
2. Mode: playback
recorded
portion
distortion
R-CH
LINE
IN
no
signal
Mode: playback
LINE OUT
Specification: less than 1.5%
400 Hz bandpass
100k. filter
wn
LINE OUT
(L, R)
Specification:
Playback ~ VTVM Reading
L-CH (400 Hz) level difference:
R-CH (no signal) greater than 48 dB