Onkyo TA 2090 Service Manual

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SERIAL NO. 3191

ONKYO SERVICE MANUAL

STEREO CASSETTE
TAPE DECK

MODEL TA-2090

SAFETY-RELATED COMPONENT WARNINGII

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 INi
SULATED FROM THE SUPPLY CIRCUIT BEFORE
RETURNING THE APPLIANCE TO THE
CUSTOMER.

AIIIIIII IIIIMPIIIIIIIIS

SPECIFICATIONS

Track Format:
Erasing System:
Tape Speed:

Wow & Flutter:
Frequency Response:

Signal-to-Noise Ratio:

Input Jacks:

4 tracks. 2 channels
AC erase
4.8 cm/sec. (1-7/8 i.p.s)
0,02% (WRMS)
207718.000Hz (25,; 7 ,OUOHZ i 3dB)
(normal position tape)
207720.000Hz (2549,000Hz i 3dB)
(high position tape)
20- 22,000Hz (25721,000Hz : 3dB)
(metal position tape)
60dB (metal position tape, Dolby
NR out). A noise reduction of 10dB
above SkHz and SdB at (Hz is
possible with Dolby B NR.
A noise reduction of 20dB at SkHZ is
possible with Dolby C NR.
A noise reduction of 30dB is possible
with dbx NR.
Micjacks: 2
Input sensitivity: 0.3mV/600 ohms
Input impedance: 5 kohms
Line IN: 2
Input sensitivity: 60mV
InpUt impedance: 50 kohms
DIN In Jack: 1
' put sensitivity: 0.1mV/l; kohm
[11 impedance: 2.7 kohnis

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TA72090

Outputs: Line OUT: 2
Std output level: 1100mV (odB)
Optimum load impedance: over 10
kohms
Headphone Jack: 1
Optimum load impedance: 8A-200
ohms
DIN Out Jack: ]
Standard output level: llOOmV
(at OdB)
Opt load impedancezover 10 kohms
Motors: Brushless DD rnotor 1 DC motors: 2
Heads: Rec/PB: Sendust combination
Erase: Dual gap ferrite
Semiconductors: TR7|30 Diodes:68 IC238 LED:33
Power Consumption: 47 watts
Dimensions: 450(W) x 100(H) x 392(D) mm
(17-11/16 x 3-15/16 x 15-7/16)
Weight: 9 kgi(19.81bs.)

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

SERVICE PROCEDURES

1. Instulation resistance measurement

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

Specifications;500 V more than 10 MO

2. Replacing the lamps
This unit used the lamps listed below.

Circuit No. Parts No. Description
Mechanism © 24606173 50mA,l4V.Lamp
PL701 210090 lSOmA, 14V. Lamp

CAUTION:Before replacing the lamps, be sure to unplug
the power supply cable.

FEATURES

3-Head Configuration

Having three heads is a must for all serious recordists be-
cause it allows monitoring the just-recorded signal while
the recording is in progress. Another advantage is that the
recording and playback head gap widths can be optimized
for their respective tasksr To further enhance performance,
the recording and playback heads are made of Sendust.

3 Motors with Direct-Drive Capstan Motor

Tape is driven by a brushless direct-drive motor. A second
motor drives the reel tables and a third motor moves the
head assembly up and down. This lowers wow and flutter
to an insignificant 0.02% (WRMS).

Real Time Tape Counter

The electronic tape counter shows either the elapsed time
during playback or recording or the time remaining until
the end of the cassette in minutes and seconds,

Dolby B and C NR, dbx NR and Dolby HX Pro

This unit has all three of the most frequently used noise
reduction systems, Dolby B NR, Dolby C NR and bdx NR,
to meet all kinds of recording needs. This deck also has
Dolby HX Pro to help prevent tape saturation and allow a
tape to contain a wider dynamic range.

Fully Automatic ACCUBIAS
To fine tune the recording bias to the optimum point.
simply put the deck in the rec/pause standby mode and
press the ACCUBIAS button.

Multiple Mode Display for Six Deck Operating Modes

The head block position and tape speed are each shown in
a graphic format by a total of six LEDs to permit quick
confirmation of the current deck mode.

Auto Music Control System (A.M.C.Si)

The AMCS automatically locates the beginning of every
song on a cassette in either the forward or the reverse
direction. When the forward AMCS button is pressed
during the play mode, the tape is rapidly wound to the
beginning of the next song and the first 10 seconds (ap~
proximately) is played. Then the tape is rapidly wound
forward to the beginning of the next song and about 10
seconds is played again. This process continues Until the
PLAY button is pressed to cancel AMCS operation and
return to normal playback. When the reverse AMCS bUtton
is pressed during the play mode, this process is performed
in the reverse direction.

Bright Fluorescent Peak Hold Level Meters

The colorful left and right peak hold level meters react
instantaneously to changes in signal level and a peak-hold
system maintains peak readings for a second to make sure
you dont miss potentially harmful input signals when
setting the recording level,

Single Song, Whole Side and Block Repeat Modes

With this deck. you have a choice of three ways to play a
tape repeatedly: (1) Single repeat for one song: (2) Full
repeat for an entire cassette side: (3) Block repeat for a
section of the cassette between the [0:00] counter reading
and any other counter reading.

Auto Space Rec Mute Button
This button lets you insert unrecorded sections five seconds
in length with one touch simplicity.

Remote Control Unit Connector

With an optional remote control unit (such as the RC-ST),
this unit can be controlled even while you are relaxing in
your favorite chair. All transport modes are included:
record, play, fast forward, rewind, stop and pause,