Onkyo TA-630D User manual

SERIAL NO. 3055
ONKYO. SERVICE MANUAL
y
STEREO CASSETTE
TAPE DECK
Model TA-630D
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ONKYO.
AUDIO
COMPONENTS

TA-6300
SPECIFICATIONS
Track Format: 4 track, 2 channels
Erase System: AC erase
Tape Speed: 4.8 cm/sec
Wow & Flutter: 0.048% (WRMS)
Fast Forward and
Rewind Time: 90 sec (C-60)
Frequency Response: 30 ~ 15,000 Hz Normal tape
30 ~ 18,000 Hz CrO, tape
30 ~ 18,000 Hz FeCr tape
Signal-to-Noise Ratio: 68 dB (FeCr tape; Dolby NR in,
Dolby Level)
Transistors: 40
SCR: 1
Ic: 4
Diodes: 25 diodes, 3 LED
Input Terminals: = ( Microphone jacks 2
Minimum input level 0.3 mV
Input impedance 50 kQ
|opsmen mic impedance
200 2 ~ 50k
Line in jacks 2
Minimum input level 50 mV
Input impedance 50 kn
DIN Jacks 1
Minimum input level
0.1 mV/kQ
Input impedance 5 kQ
FEATURES
High Quality Long Life “S & S’’ Sendust Head
Onkyo’s recently developed “S & S’’ Sendust head (made
from a highly robust silicon/iron/aluminum alloy of out-
standing magnetic properties) plays a very big role in
achieving the high quality of sound reproduction in the
TA-630D. Extended frequency response (20 Hz ~ 18,000
Hz with chrome tapes) and an exceptionally wide dynamic
range make your recordings sound professional-like.
Built-in Accu-Bias Control
Optimum bias level is essential for really top grade record-
ings. But since the magnetic characteristerics of different
types of tape vary from brand to brand, the conventional
bias settings are only approximates. The Onkyo TA-630D
Accu-Bias control eliminates the “‘approx”, and ensures
you of superb results with every tape used, especially in
the high frequency region.
Dolby NR System with Switchable MPX Filter
Now a regular feature in all high grade cassette tape decks,
the Dolby NR system eliminates. much of the annoying
tape hiss from your recordings. And by also incorporating
the Dolby circuit in a highly reliable single-chip 2-channel
monolithic IC, outstanding channel balance is achieved.
Furthermore, a built-in MPX filter removes the pilot signal
from FM broadcasts for brilliant high quality recordings.
Built-in Dolby FM Decorder
With the TA-630D you will be right up to date for record-
ing of the increasingly popular Dolby FM broadcasts. No
need for an extra adaptor, or a new tuner/receiver
especially designed for Dolby FM. The improved S/N ratio
makes noise practically non-existent.
Output Jacks: Line out jacks 2
Standard output level
0.775 V (0 VU)
Optimum load impedance
over 50 k2
DIN Jack 1
Standard output level
0.775 V (0 VU)
Optimum load impedance
over 50k
Headphones 8 2 ~ 2002
PLL Servo DC
For U.S.A. and Canada —
AC 120V/60 Hz
For other countries
AC 110/120/220/240 V 50/60 Hz
or 240 V 50 Hz.
Power Consumption: 13 W
Motor:
Power Supply:
Dimensions: 418(W) x 158(H) x 297(D) mm
16-1/2” x 6-1/4” x 12”
Weight: 6 kg (13.2 Ibs)
Accessories: Pin-Pin type connecting cords... 2
* Specifications and design are subject to modification
without prior notice for product improvement.
* Cabinet Composition: Embossed viny! over metal.
Timer Switch for Automatic Recording or Morning Alarm
By simply connecting up to an audio timer, the TA-630D
will record those “not-to-be-missed” programs even in
your absence. Or then you may wish to substitute your
morning alarm with some of your favorite symphonies and
recording artists.
One-Touch Rec Muting for Clean Editing
This simple switch will make a big difference to your tape
recording and editing. Since tape transport will continue
in a “no-signal” recording mode, the interval between tunes
will be completely silent. Editing out of commercials will
also be swift and clean-cut.
Memory Rewind for Rapid Replay
After presetting the tape counter and memory rewind at a
particular section of the tape, a simple push of the rewind
rewind button will return the tape back to that point quick-
ly and accurately, saving considerable time and bother.
Separate 3-Way Bias and Equalization Selectors
The TA-630D is designed to handle all major types of
cassette tapes available on the market today. And in com-
bination with the Accu-Bias control, optimum bias levels
are assured for every tape used.
Full Auto-Stop Mechanism .
Full automatic stop at the end of the tape safeguards both
tapes and tape transport from undue strain.
The TA-630D is also equipped with an electronically con-
trolled full auto-stop mechanism to ensure that no strain
whatsoever is applied to either tape or tape transport
system.

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TA-630D
EXPLODED VIEW
EXPLODED VIEW-PARTS LIST
REF.
NO.
1
i)
Nn & W
PARTS NO.
243095
243096
210045
16449542
210034
210035
25040047
25040054
25045046
5148031
27110066
27115027A
27115027B
27170023-1
280379
834130122
831430082
27210104
16449121
27267024A
27267025A
DESCRIPTION
NIND-0500S95, VU meter
NIND-0500S96, VU meter
0.1A, 6.3V, VU meter lamp
NAPL-542, Peak indicator p.c.b.
RMS-6V-50, Accu. indicator lamp
RMS-6V-50, Rec. indicator lamp
NLS-111-2715-L23P, Power
switch (N)
NLS-121-2725-L29, Power
switch (U)
HLJ0264-01-070, Stereo
headphone jack
N16RGC2KB25, Accu. control
variable resistor
Front bracket
Side bracket (N)
Side bracket (U)
Bottom board
Leg
3STS+12BQ, Tapping screw
3STW+8 BQ(BC), Tapping screw
Front panel
Front panel ass’y
Guide (A)
Guide (B)
REF.
NO.
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
NOTE:
PARTS NO.
27267007
28198506
28198510
27300148
28320229
28320226
28320227
28320225A
28320228
28320256
28320224A
28320223A
28320222A
28320220A
28320221A
28184022
838440109
27300088
27300089
27300091B
870052
801173A
DESCRIPTION
Guide (PUSH)
Facet
Facet
Window for counter
Knob, lever
Knob (R)
Knob (L)
Knob (OUT)
Knob, push
Knob, volume
Knob, push
Knob, lever
Knob, lever
Knob, lever
Knob, lever
Top cover
4TTB+10C (BC)
Cassette cover
Cassette plate
Cover
Washer
Decorative screw
N: U.S.A. model
U: Universal model

COMPONENT LOCATION
TA-030D
(1)
(18)
(16)
(17)
(8)
@)
(2)
(12)
\
Go | O® ©
COMPONENT LOCATION-PARTS LIST
U.S.A. model Universal model
REF. PARTS NO DESCRIPTION REF. PARTS NO DESCRIPTI
NO. NO. ON
1 16449538 NAAF-5 38, Rec. and Pb. amplifier 1 164495 38 NAAF-5 38, Rec. and Pb. amplifier
p.c.b. p.c.b.
2 16481569 NASW-469, Mic. jack p.c.b. 2 16481569 NASW-469, Mic. jack p.c.b.
3 16449543 NASW-543, Memory rewind and 3 16449543 NASW-543, Memory rewind and
accu. switch p.c.b. accu. switch p.c.b.
4 16449540 NASW-540, Dolby FM p.c.b. 4 NASW-540A, Dolby FM p.c.b.
5 16449539 NAPL-5 39, Dolby NR indicator 5 164495 39 NAPL-539, Dolby NR indicator
p.c.b. p.c.b.
6 16449542 NAPL-542, Peak indicator p.c.b. 6 16449542 NAPL-S42, Peak indicator p.c.b.
7 210043 RMS-6V-50, Deck illumination 7 210043 RMS-6V-50, Deck illumination
lamp lamp
8 3504012 UL125V103M, UL capacitor 8 3500052 PME271Y510CEE, IS capacitor
9 25040047 NLS111-2715-L23P, Power switch 9 25040054 NLS-121-2725-L29, Power switch
10 250008 ST-3312, DIN socket (Lever section)
11 25045025 NPJ-4PRBL03, Input/output 25065064 Power switch (Wiring section)
terminal 25065065 Power switch (Switch section)
12 25045046 HLJ0264-01-070, Stereo 10 250008 ST-3312, DIN socket
Headphone jack 11 25045025 NPJ-4PRBLO3, Input/output
13 253099 AS-UC3, Power supply cord terminal —
14 230240 NPT-641D, Power transformer 12 25045046 HLJ0264-01-070, Stereo
15 27120129B Back panel headphone jack
16 27180027 Spring 13 253083 Power supply cord
17 27140180A Lever (A) 14 2320242 NPT-641ADGO, Power
18 27180022 Spring transformer
19 244008 Deck ass’y 15 27120140 » ~~ Back panel
20 27300098 Shielded plate 16 27180027 Spring
21 270025 SR-3P4, Streinrelief 17 27140180A Lever (A)
18 27180022 Spring
19 244008 Deck ass’y
20 27300098 Shielded plate
25030018 PA-125, 3P inlet
25050021 X-17240, Voltage selector
250227 PS plug
252016 0.3AT, AC fuse

“A-630D
CIRCUIT DESCRIPTION
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4.7K
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Ke oo SKS BK a oN SWITCHING bone ior 2
1. Accurate Bias Circuit
Optimum bias current varies according to the type of tape
being employed. Too little bias current will result in
increased distortion, while too much bias current will result
in deterioration of the frequency response. For this reason,
the TA-630D has been equipped with an Accu Bias Control
(front panel) which permits optimum bias currents to be
set accurately for different tapes.
A major feature of the TA-630D is the Accu-Bias circuit
which permits optimum bias adjustments for every
individual cassette tape used, thereby ensuring recordings
of very flat frequency responses.
1. Insert a blank tape into the cassette compartment, and
set the Tape Selectors accordingly.
2. For Accu-Bias adjustments, the Dolby NR switch must
always be in the Out position.
3. When starting at the beginning of a new tape, press the
> > FF key to advance the tape by 20 ~ 30 in the
Tape Counter. (This will ensure optimum bias adjust-
ment). |
4. Press the m= Pause key, and then the @ Rec and >
Play keys to prepare the deck for recording mode.
. Press the Memory push-button (On position).
. Reset the Tape counter to 000.
. Press the Accu-Bias push-button (On position). The
Accu-indicator lamp will consequently light up.
8. Turn the Accu-Bias Adjust control to the ‘0’ (click-
stop) position.
9. Check that the meter pointers deflect across to around
the 0 VU position. Since the internal oscillator
generates alternate 400 Hz and 10 kHz (-—20 VU)
signals.
10. Release the @# @ Pause key, and record for a count
of 5 to 10.
11. Press the << Rew key. The tape will rewind back to
000 and stop automatically.
12. Press the » Play key to playback the tape.
13. Turn the Accu-Bias Adjust control around in either
direction to find the position where the meter pointers
again swing back and forth with minimum amplitude.
This adjustment will now correspond to the optimum
bias setting for that particular tape.
14. Leaving the Accu-Bias Adjust control in the adjusted
position, press the Accu-Bias push-button a second
time to disengage the Accu-Bias circuit. Now proceed
with the regular recording.
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NASW-543_-
During recording: Q611, C610 ~ C612, R631, R632 and
R634 constitute a 10 kHz CR oscillator circuit, while
Q614, C615 ~ C617, R644, R645, and R647 constitute a
400 Hz oscillator circuit. By using a non-stable multi-
vibrator, Q612 and Q613 switch the 10 kHz and 400 Hz
signals back and forth at approximately 2 second intervals
(Q613 is turned OFF when Q612 is turned ON, and vice
versa). When Q612 is turned ON, the collector voltage
drops, resulting in Q615 being cut OFF. And since Q613
has already been cut OFF, Q616 will be turned ON,
resulting in the 10 kHz signal passing out through the
ACCU OSC output. When Q613 is then turned ON, Q612
is cut OFF immediately, resulting in the 400 Hz signal
appearing at the output. These output signals (alternate
10 kHz and 400 Hz signals of equal levels) are then passed
to the recording amplifier (Q111) prior to being recorded
on tape.
During playback: The recorded signals are passed via a
playback equalizer amplifier, a preamplifier, and a line
amplifier. The 400 Hz signal is passed via the R623/C 629
low-pass filter and Q609, on to the meter drive circuit.
The 10 kHz signal, on the other hand, is passed via the
C632/R628 high-pass filter and Q610, on to the Accu Bias
Level VR (coupled to the front panel Accu Bias Control)
before being mixed in the meter drive circuit. Then
optimum bias is selected for that particular tape by adjust-
ing the Accu Bias Control to make the levels of the 400 Hz
and 10 kHz signals equal.
2. Timer Start
(1) Set the time of the timer unit plugged into the AC
mains.
(2) Press the record key and/or the play key, and also the
pause key. Then turn the power switch on.
(3) The power supply will thus come on at the preset time.
(4) C701 will consequently be changed up via R702, result-
ing in Q701 being turned ON some 4 seconds later.
(5) Q702 will therefore turn OFF.
(6) The signal will pass via S701 and C702, on to the gate
of Q704.
(7) Q704 will thus be turned ON.
(8) The charge on C707 will then be discharged through
solenoid and Q704, which is thereby activated.
(9) The pause key is releassed by this solenoid action,
resulting in the start of the recording, or playback,
mode.

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5703 5702
REW COUNTER
Q701,970 945(K)
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3. Memory Rewind
(1)
(2)
(3)
(4)
(5)
(6)
(7)
(8)
(9)
(10)
Press the reset button to return the counter to 000.
Then press the memory button.
Then commence operation in playback or record
modes, but not rewind.
After reaching any desired position on the tape, press
the rewind key.
Since the deck is now in memory rewind mode, S703
and S704 will be ON. And when the tape exceeds the
original starting position (counter at 999) the counter
switch $702 will also turn ON.
The voltage at point (3) in the circuit diagram will
then increase from 0 to 12V, this signal being applied
to the gate of Q704 via R707 and C703.
Q704 will thus be turned ON.
The charge on C707 will then discharge via the
solenoid and Q704, thereby activating the solenoid.
The depressed keys are thus relased by the activated
solenoid.
Upon completion of the C707 discharge, Q704 will
be turned OFF. C707 will the commence to charge
up again via the SOL701 solenoid to be prepared for
subsequent operations.
MECHANICAL OPERATIONS
1. Drive System
Play Drive
Direct flywheel drive via flat belt passing around the
motor pulley.
Take-up reel driven by an angled belt passing around
the motor pulley and a tension pulley.
Note that because the motor and tension pulleys rotate
in opposite directions, the belt is also passed around an
intermediate pulley.
FF and REW Drive :
The flywheel driven by a flat belt passing around the
motor pulley, presses against an idler which in turn
drives the reel bases.
Q703_DN838__
Q704
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5704
PAUSE
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4. Auto Stop
(1)
(2)
(3)
(4)
(5)
(6)
(7)
(8)
Motor Pulley
A magnet connected to a counter, which in turn is
connected to the take-up reel via a counter belt, is
rotated during tape transport.
This rotating magnet consequently results in the
generation of square wave output signals from the
Q703 Hall IC (4).
These signals are rectified by D701 and D702,
smoothed by C706, and then applied to the gate of
Q704 (5) which is thus kept at a negative potential.
Once the tape stops, the Q703 output signals will
cease.
C706 will thus be charged up via R714, R713, R710,
and R709, resulting in an increase in voltage. -
Q704 will consequently turn ON if the gate (5)
potential exceeds 0.6V (approx.)
The charge on C707 will then discharge via Q704 and
the solenoid. The solenoid is thus activated, releasing
the depressed keys, and bringing tape transport to a
halt.
After C707 has completely discharged, Q704 will
turn OFF. C707 will then recommence to charge up
again via the R714 solenoid in order to be ready for
the next auto-stop operation. This charge up time is
approximately 3 seconds.
Tension Pulley
Middle Pulley
h
Reel, supply
Reel, take-up
Idler lever
Flat belt

TA-O300D
2. Auto-Stop
When tape transport stops, the counter pulley driven by
a round belt passing over the reel base, and the 12-polar
ring magnet connected to the counter pulley, also stop.
This is detected by the Hall IC, resulting in the activa-
tion of the auto-stop circuit. The solenoid plunger is
consequently pulled in, thereby moving the stop plate,
and releasing the depressed keys.
3. Memory Rewind
When the counter returns to 999 during rewind mode,
and the solenoid thereby activated, a pin inserted in
the core of the solenoid acts against the stop plat, there-
by releasing the depressed key.
The position of this pin is determined by the timer lever.
Consequently, only the stop plate is moved.
Although the timer lever is also coupled to the pause
key, it will not be moved unless the play key is also
depressed. The timer lever is held in check by the
selector lever.
4. Timer Start
When the record key (and/or play key) and pause key
are pressed, the selector lever is moved forwards. And
since the timer lever is coupled to the pause key, the pin
is moved away from the stop plate, but is in contact
with the operation plate. When the power supply is
turned on, and the solenoid activated, the operation
plate is moved across to the lock plate (which holds the
pause key in the pause position), thereby releasing the
lock.
DISASSEMBLING INSTRUCTIONS
1. Removal the cassette door
Press the STOP/EJECT key to open the cassette door, then
lift the door up and out to remove as illustrated below.
2. Removal the front panel
Remove four screws which hold the top cover to side
bracket and lift the top cover up. Pull out the input,
output and adjust knobs.
Pull out six lever knobs. Remove six screws which hold
the front panel to the front bracket.
Timer lever
Selector lever
Wg Play
J oon ion
plate
Stop
Operation plate
Stop
plate
biay
and
Pause
switch
to ON position.
3. Removal the cassette chassis
(1) Remove the top cover and front panel.
(2) Remove a screw which hold the shileded plate to deck
bracket (L).
(3) Remove four screws which hold the deck bracket to
the front bracket. |
(4) Remove two screws which hold the deck bracket to
the top of front bracket.
(5) Remove the spring from the recording lever (A).
4. Replacing the take-up and supply reel
(1) Remove a screw which hold the door arm (L) to the
cassette chassis.
(2) Remove a screw which hold the door arm (R) to the
cassette chassis.
(3) Remove two spring from the door arm (R).
(4) Remove the mylar washer to remove the reel.
Note: Once the mylar washer been removed, it cannot be
used again. Replace with a new washer.
5. Replacing the motor
(1) Remove two screws which hold the muting switch to
motor bracket.
(2) Remove two belts from the motor pulley and hang to
pin.
(3) Remove two screws (B).

TA-0350D
6. Replacing the belts
6-1. Motor belt (motor pulley—tension pulley)
1) Remove two screws (A).
2) Remove the belt with a pair of tweezers.
6-2. Counter belt
1) Remove two screws which hold the auto-stop
p.c.b. to counter bracket.
2) Remove the belt from the counter pulley.
3) Open the cassette door and remove the belt from
the take-up reel with a pair of tweezers.
6-3. Motor belt (motor pulley—flywheel)
1) Remove three screws (C).
2) Remove the belt.
7. Replacing the flywheel
(1) Remove two screws (A).
(2) Remove two belts from the motor pulley and hang
the belt to pin.
(3) Remove three screws (C).
(4) Remove the flywheel.
MECHANISM ADJUSTMENTS
1.
Door
speed
adjustment
_
@®
3 turms
Arm, door
2. Play torque adjustment
Strong
+10gr.—cm
Play torque adjustment
Adjust the torque by
changing the position of
arrow mark.
Spring
Fast
Door speed adjustment
Adjust the door speed by Late
bending this spring.
Current
consumption
(motor)
Mechanism
specifications
Playback:
80
—
120
mA
1)
Tape
speed:
4.8cm/sec.
(3kHz
+10Hz,
—OHz)
Recording:
80
—
120
mA
Use
a
standard
test
tape,
MTT-111
Fast
forward:
100
—
180
mA
(3kHz)
or
equipment.
Rewind:
105
—
180
mA
2)
Wow
and
Flutter:
Less
than
0.048%
(WRMS)
Auto-Stop
3)
Take-up
torque:
35
—
70
gr-cm
Playback-Stop:
90—110mA
4)
F.F.
torque:
55
—
130
gr-cm
Rewind-Stop:
280
—
380
mA
|
5)
Rewind
torque:
55
—
130
gr-cm
F.F.-Stop:
280
—
380
mA
6)
Rewind
time:
Less
than
90
sec.
(use
a
C-60
cassette tape)
7) Automatic shut-off
time:
Less
than
5
sec.
8)
Timer
start
time:
3.5
sec.
—
7
sec.

PTA-630D
ELECTRICAL ADJUSTMENT PROCEDURES
PRECAUTIONS
1. Tape required: 3. The switches and controls should be set as follows unless
(1)
Blank
tape
:
otherwise
specified.
MAXELL
UD-XL/I
(Normal)
Accu
bias
adjust
control:
Center
UD-XL/II
(CrO2)
Accu
bias
switch:
Off
SONY
Duad
(FeCr)
Tape
selector
bias
switch:
Normal
Tape selector equalizer switch: Normal
(2)
Test
tape
Dolby
NR
switch:
Out
VICTOR
VTT-658
10
kHz,
—15
dB
Input
selector
switch:
Line
TEAC
MTT-111
3
kHz,
—10
dB
Output
level
control:
Maximum
MTT-150
—
Dolby
level
calibration
Input
level
control:
Maximum
tone. FM de-emphasis switch: 25 psec.
2. Instrument required:
(1) AC VTVM
(2) Frequency counter
(3) AF oscillator
(4) Attenuator
1. PLAYBACK MODE ADJUSTMENT 1-4. VU meter adjustment
1-1. Head azimuth adjustment PROCEDURES:
PROCEDURES: 1) Play the test tape MTT-150 back.
1) Play the 10 kHz portion of the test tape VTT-658 ) Aflests to che Doloy mark Co s3aB) ae
back. Adjust the head azimuth adjusting screw for meter
maximum V.T.V.M. read.
2) If the peak output reads of the right and left 1-5. Playback frequency response adjustment
channels are different, set the screw to obtain the Connect the AC VTVM to the TP-103 and TP-104 test
5) Mechanica center petween the Pee bond point. Play the test tape VIT-658 back.
J Ww ne. Adjust the voltage to 150 mV with R133 and R134.
VTVM
47 kQ VTVM
=
Unit
Feo
j
a7
KO
mee =
Line Out
TP-103, TP-104
1-2. Tape speed adjustment
PROCEDURES:
}
JUSTMENT
Play
the
3
kHz
portion
of
the
test
tape
MTT-111
back,
2°
RECORDING
MODE
ADJU)
Adjust
the
tape
speed
adjusting
semi-fixed
resistor
in
2-1.
Bias
coil
trap
coil
adjustment
the
motor
for
3,000
to
3,010
Hz
counter
indication.
1)
Set
the
tape
deck
in
the
recording
mode
of
opera-
FREQUENCY
COUNTER
tion.
7
2)
Set
the
Bias
selector
switch
to
CrO,
position.
3)
Connect
the
AC
VTVM
to
TP-105
and
TP-106
test
point.
4)
Adjust
L111
and
L112
for
minimum
VTVM
read.
Line Out
1-3. Playback output adjustment
PROCEDURES:
1) Play the test tape MTT-150 back, adjust R 135 and
R136 for 775 mV V.T.V. M. read. |
2) Proceed both for the left and right channels in the
same manner.
VTVM
47 kQ
-_ Unit OE
TP-103, TP-104
10