Onkyo TA 630 DM Service Manual

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SERlAL NO. 3085

ONKYO, SERVICE MANUAL

STEREO CASSETTE

TAPE D ECK
Model TA-63ODM

TABLE OF CONTENTS

item Page
Specifications 2
Features 2
Block diagram 3
Exploded view 4
Component location 5
Circuit description 6
Mechanical operation 7
Disassembling instructions 8
Mechanism adjustment procedures 9
Electrical adjustment procedures 10
Service guide 12
Mechanism-exploded view 13
Printed circuit board View )5
Schematic diagram 17
PC board-parts list 19
Packing procedures 20

ONKYO®
Alllllll BIIMPIINENIS

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SPECIFICATIONS

4 track, 2 channels

AC erase

4,8 cm/sec . _

0.055% (WRMS)fl NE v1 WI}.
hiVE> 0.00 1°

Track Format:
Erase System:
Tape Speed:
Wow & Flutter:
Fast Forward and
Rewind Time: 90 sec (060)

Frequency Response: 30 ~ 15,000 Hz Normal tape

(30 ~ 14,000 Hz : 3 dB)

30 ~ 18,000 Hz C10, tape

(30 ~ 17,000 Hz t 3 dB)

30 ~ 20,000 Hz Metal tape

(30 ~18.000 Hz 1 3 dB)
Signal~to-Noise Ratio: 60 dB (Metal tape; Dolby NR out)

A noise reduction of 10dB above

5 kHz and 5 dB at 1 kHz is possible

with the Dolby NR IN

Transistors: 40

SCR: 1

1C: 4

Diodes: 25 diodes, 3 LEDs

Input Terminals: Microphone jacks-2
Minimum input level: 0.3 mV
Input impedance: 50 km
Optimum mic impedance:
200 S2 ~ 50 km

Line in jacks~2
Minimum inpUt level: 50 mV
Input impedance: 50 km

FEATURES

High Quality Long Life "S & S" Sendust Head

Onkyos recently developed S & S Sendust head (made
from a highly roubust sillicon/iron/aluminum alloy of out»
standing magnetic properties) plays a very big role in
achieving the high quality of sound reproduction in the
TA-63ODM. Extended frequency response (20 Hz ~ 18,000
Hz with chrome tapes) and anexceptionally wide dynamic
range make your recordings sound professional-like.

Builtin Acou-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-630DM
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-630DM 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 es-
pecially designed for Dolby FM. The improved S/N ratio
makes noise practically non-existent.

DIN lacks-1
Minimum input level:
0.1 mV/kn
Input impedance: 5 kn
Line out jacks»2
Standard output level:
0.775 V (0 VU)
Optimum load impedance:
over 50 k9
DIN Jack-l
Standard output level:
0.775 V (0 VU)
Optimum load impedance:
over 50 kn
Headphones: 8 Q ~ 200 51
Motor: PLL Servo DC
Power Supply: AC 120V/60 Hz
Power Consumption: 13 W
Dimensions: 418(W) x 158(H) >< 297(D) mm
164/2 x 6-1/4"x12"
6 kg (13.2 lbs)
Pin-Pin type connecting cords , 2

Output Jacks:

Weight:
Accessories:

* Specifications and design are subject to modification

without prior notice for product improvements.

* Cabinet Composition: Embossed vinyl over metal.

Timer Switch for Automatic Recording or Morning Alarm
By simply connecting up to and audio timer, the TA-
630DM 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 times
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~630DM 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-630DM is also equipped with and electronically
controlled full autostop mechanism to ensure that no
strain whatsoever is applied to either tape or tape transport
system.