Onkyo TA 2058 Service Manual

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OM-3230
STEREO CASSETTE
TAPE DECK
MODEL TA-2058
Black and silver model
UDN, UDC, UD 120V Ac, 60Hz
uc 220v AC. SOHZ
uw 120 or 220v AC. 50/60Hz
UQA, UQB 240v AC SOHZ
SPECIFICATIONS
SAFTY-RELATED COMPONETN WARNINGI! Track Format: 4 tracks, 2 channels
COMPONENTS IDENTIFIED BY MARK A UN Erasing System: AC erase
THE SCHEMATIC DIAGRAM AND IN THE PARTS Tape Speed: 4.8 cm/sec- (1-7/8 inst)
LIST ARE CRITICAL FOR RISK OF FIRE AND W0w&Fluttex: 0.045%(WRMS)
ELECTRIC SHOCK. REPLACE THESE COM- Frequency Response: 20'17,000Hz (30-16,000Hz i3dB)
PONENTS WITH ONKYO PARTS WHOSE PARTS (normal position tape)
NUMBERS APPEAR AS SHOWN IN THIs MANUAL 20-18,000Hz (30-17,000Hz :3dB)

(high position tape)
2049,0001-12 (30718,000Hz :3dB)
(metal position tape)
Signal-to-Noise Ratio: 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.
Input Jacks: Mic jacks: 2
Input sensitivity: 0.6mV/600
ohms
Input impedance 5.6 kohms
Line IN: 2
Input sensitivity: 60mV
Input impedance 50 kohms

ONKYO
Std output level: SOOmV (OdB)
Optimum load impedance:
Illlllll BBMPIIIIIIIIS
Headphone Jack: 1

MAKE LEAKAGE-CURRENT OR RESISTANCE
MEASUREMENTS TO DETERMINE THAT EX-
POSED PARTS ARE ACCEPTABLY INSULATED
FROM THE SUPPLY CIRCUIT BEFORE RETURN-
ING THE APPLIANCE TO THE CUSTOMER

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TA2058

Optimum load impedance:

8-200 ohms
Motors: DC servo motor: 1
DC motor: 2
Heads: REC/PB heads: Special Hard
Permalloy
Erase head: Ferrite
Power Supply: AC 120V/60HZ
Power Consumption: 34 watts
Dimensions: 435(W) x 112(H) x 360 (D)mm
(17-1/8" x 4-3/8"x14-1/8")
Weight: 6.1 kg. (13.4 lbs.)

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

SERVICE PROCEDURES

1. Replacement of power supply cord

There are two power supply cord outlets on the strainrelief.
Insert them in prescribed direction to ensure safety. AS-UC-
3 (UD<120V> model) should be inserted lengthwise and
other types of cords should be inserted horizontally.

Power Supply Cord Power Supply Card

t [I

3
length wise Horizontal
directian direction

2. Instruction resistance measurement

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

Specifications; 500V more than 10M!)

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

Circuit No. Part; No. Description
Mechanism 24606173 SOmA, 14Vi Lamp
184b

PL901 210090 lSOmA, 14V. Lamp
PL902 210190 60mA, 14V. [amp

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

FEATURSE

Three Heads with Special Hard Permalloy

For Superior Metal Tape Performance

Having three heads means you can monitor the actual
recorded signal as you record instead of rewinding the tape
to check your recording afterward. The 3-head system also

has the advantage of making possible the use of separate
record and playback gaps, each optimized for its own task.
The special hard permalloy head formulation boasts the
high saturation flux density and abrasion resistance needed
for true metal tape compatibility.

Preset Automatic Accubias

Different brands of cassette tape can exhibit slight varia-
tions in playback frequency response even when recorded
at exactly the same bias level. Automatic Accubias tailors
the recording bias to the magnetic characteristics of any
cassette tape. The Auto Accubias preset knob allows you
to choose from five different frequency response positions
(-2, -l, 0, +1, +2) before the adjustment takes place.
The 0 setting results in flat playback response. If you wish
to boost high frequencies (when recording electronic music,
for example) choose + 1 or + 2; choose - l or v 2 to
attenuate them. This system combines maximum
flexibility with ease of operation.

Dual Sensor Real Time Tape Counter

The tape counter circuit measures the speed of both tape
reels and compares them by microcomputer to provide
precise readings of remaining time. This dual sensor
technique eliminates small errors in time calculations
caused by slight variations in tape thickness between
different manufacturers to give the most accurate time
indications possible

2-Motor Tape Transport with Separate Head Assembly
Motor

The tape transport system. along with the heads, is the
most important factor affecting the basic performance of
a cassette deck. To assure extremely stable and accurate
transport, this unit uses a DC servo-controlled capstan
motor. This motor is unaffected by fluctuations in the
power supply voltage and frequency and instantaneous
changes in load. A highly reliable simple drive transmission
system and precision vertical cassette holder further en-
hance overall accuracy and stability. As a result, wow and
flutter is under 0.045%. In addition, separate DC motors
drive the reel tables and head base and the head assembly is
constructed to move silently with no annoying clicks.

Dolby B and C Noise Reduction, and Dolby HX PRO
Along with standard Dolby B NR, this unit 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 band width of noise reduction
according to the input level, thereby avoiding noise "pump-
ing. 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.
This deck also features Dolby HX PRO which helps prevent
tape saturation and thereby allows you to record tapes con-
taining a wider dynamic range.

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