Onkyo TARW 99 Service Manual

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TA-RW99

SERIAL No. 3220

ONKYO SERVICE MANUAL

STEREO CASSETTE
TAPE DECK

MODEL TA-RW99

Black and silver models
UDN, UDC, UD 120V AC, 60Hz
UG 220V AC, 50Hz
UW 120 or 220V AC, 50/60Hz
UQA, UQB 240V AC, SOHz

SAFETY-RELATED COMPONENT WARNING

COMPONENTS IDENTIFIED BY MARK 3. ON
THE SCHEMATIC DIAGRAM AND IN THE PARTS
LIST ARE CRITICAL FOR RISK OF FIRE AND
ELECTRIC SHOCK, REPLACE THESE COM-
PONENTS WITH ONKYO PARTS WHOSE PARTS
NUMBERS APPEAR AS SHOWN IN THIS MANUAL.

MAKE LEAKAGE-CURRENT OR RESISTANCE
MEASUREMENTS TO DETERMINE THAT
EXPOSED PARTS ARE ACCEPTABLY [Ni
SULATED FROM THE SUPPLY CIRCUIT BEFORE
RETURNING THE APPLIANCE TO THE
CUSTOMER.

ONKYOQ
AIIIIIII IIIIIII'IIIIIIIIS

SPECIFICATIONS

Track System: 4-track, 2-channel stereo
Erasing System: AC erase

Tape Speed: 4.8 cm/sec (1-7/8 ip.s.)
Wow and Flutter: 0.05% (WRMS)

Frequency Response:

S/N Ratio:

Input Jacks:

20 -15,000Hz (Normal)
(30 7 14,000Hz :3dB)
20 - 16,000Hz (High)
(30 - 15,000Hz idB)
20 - 17,000Hz (Metal)
(30 7 16,000Hzi3dB)
Dolby NR out: 58dB (metal
position tape)
A noise reduction of 10dB above
5 kHz and SdB at lkHz is possible
with Dolby B. A noise reduction
of 20dB at SkI-Iz is possiblewith
Dolby C.
Line IN: 2

Input sensitivity: 60mV

Input impedance: 50 kohms
Microphone Jack: 1

Input Sensitivity: lmV

Input impedance: 5,6 kohms
DIN Jack: 1

Input sensitivity: OrlmV/

l kohms
Input impedance: 2.2 kohms

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TA-RW99

Line OUT: 2
Standard output level: 500mV
(OdB)
Optimum load impedance:
over 50 kohms
Headphone Jack: 1
Optimum load impedance: 8
to 200 ohms
DIN Out Jack: 1
Standard output level: 500mV
Optimum load impedance:
over 50 kohms
DC servo motor: 2
DC motor: 2
Rec/PB: Special Hard Permalloy
X 2
Erase head: Ferrite X 1
AC220V/50Hz, 120/220V,
50/60Hz, 120V/60Hz or
240V/50Hz
30 watts
435(W) X 1120-!) X 334(D)mm
(17-1/8 X 4-7/16 X 134/4)
6.5 kg (14.3 lbs.)

Outputs:

Motors:

Heads:
Power Supply:

Power Consumption:
Dimensions:

Weight:

I Specifications and external appearance are subject
change without notice because of product
improvements.

0 Models for use with only an AC 120V power supply
are not equipped with a DIN terminal.

SERVICE PROCEDURES

Instruction resistance measurement

Connect the insulating-resistance tester between the plug
of power supply cord and chassis.

Specifications; 500V more than 10MB

T-2 High Speed Adjustment

Operating the mechanism (PLAY/STOP) with TP7T2
grounded is liable to cause damage to the mechanism.
Thus, follow the procedure outlined below for T72 high
speed adjustment.

. Confirm that the mechanism is in the STOP mode.

. Mount the test tape in T~2 and press thePLAY button.
. Ground TP-T2 (high speed mode selected).

. Adjust the speed (using the R793 potentiometer).

. Disconnect TP-T2 from ground.

. Press the STOP button.

O'NUIAUJNH

Adjustment of light reversal sensor

Adjustment of quick reverse sensor is made using a TDK
AD 120 tape. The voltage between Pin 2 (red lead) of
socket P712 (for TAPEvl) or P713 (for TAPE72) and
ground:

Insert a TDK AD 120 tape into TAPE-l and move the
magnetic section of the tape in the FWD direction.
Adjust the potentiometer R12 (20 kohm) on the relay
PCB which follows the TAPEil mechanism, until the

voltage is between 2V and 2.5V.
Adjustments are made in the same manner for TAPE2
using R22 (20 kohm).

FEATURES

Two Auto-Reverse Tape Compartments

Because this deck has two auto-reverse tape compartments,
it is possible to make a non-stop copy of both sides of a
cassette using this deck alone, A high speed dubbing mode
is also provided to cut dubbing time in half.

Endless Auto-Reverse Relay Playback

When the reverse mode is set to repeat, both cassettes are
played back alternately until the stop button of the
compartment currently being used for playback is pressed.

Dolby B and C Noise Reduction

Along with standard Dolby B NR, this deck also has the
even more effective Dolby C NR system. Dolby C NR
reduces tape background noise by 20dB at SkHz, about
3 times more than Dolby B NR. In addition to its wide
band noise reduction, Dolby C NR uses a sliding band
technique that varies the bandwidth of noise reduction
according to the input level. thereby avoiding noise
pumping. Dolby C NR also has an anti-saturation
effect to reduce the chance of tape saturation in the high
range. All these features combine to eliminate the adverse
effects on tape sound that other noise reduction systems
can cause.

Auto Music Control System (AMCS)

Tape compartment 1 is equipped with the AMCS function
which automatically plays the first 10 seconds of every
song on a cassette in the current direction of playback.
To stop AMCS and resume normal playback from tha
point, just press the play button. This is very useful when
copying cassettes, too.

Direct Song Location

This deck is equipped with a direct access function that
winds the tape in either compartment directly to the
beginning of any song up to 15 songs away from the
present location in either direction.

Search Dubbing Function

If the search dubbing button is pressed during a 10
second AMCS playback interval or the normal playback
mode of the tape 1 holder while the tape 2 holder is in
the dubbing pause mode. the cassette in the tape 1 holder
is rewound to the beginning of the current song and
dubbing is automatically started.

Many Other Useful Features

In addition to the above-mentioned features, this deck
also has a mic mixing capability, an auto space rec mute
button, fully automatic tape selection and easy-tO-read
peak level meters.