Onkyo TA 2033 Service Manual

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ONKYO SERVICE MANUAL

STEREO CASSETTE
TAPE DECK
MODEL TA-2033
UDN, UDC, UD 120v AC, 6on
UGV, UG 220v AC, SOHz
UW 120 or 220v AC, 50/60Hz
UQA, UQB 240v Ac, 50Hz

SAFETY-RELATED COMPONENT WARNING

COMPONENTS IDENTIFIED BY MARK f3 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 APPEARAS SHOWN IN THIS MANUAL.

MAKE LEAKAGE-CURRENT 0R RESISTANCE
MEASUREMENTS TO DETERMINE THAT
EXPOSED PARTS ARE ACCEPTABLE INSU-
LATED FROM THE SUPPLY CIRCUIT BEFORE
RETURNING THE APPLIANCE TO THE
CUSTOMER

ONKYO
Alllllll IIIIMPIINHIIS

SPECIFICATIONS

Track Format:
Erasing System:
Tape Speed:

Wow & Flutter:
Frequency Response:

4 tracks, 2 channels
AC erase

0.045% (W RMS)

20- l S ,000 HZ
(30-14300 Hz i 3 dB)
(normal position tape)
20-16, 000 Hz
(SO-15,000 Hz i 3 dB)
(high position tape)

21 71 7,000 Hz
(3046,000 Hz 3 3 dB)
(metal position tape)
Signal-to-Noise Ratio:
Dolby NR out)

4.8 cm/sec. (1~7/8 i.p.s.)

TA72033

SERIAL NO. 3167

60 dB (metal position tape,

A noise reduction of 10 dB
above 5 kHz and 5 dB at 1 kHz
is possible with Dolby B NR,

A noise reduction of 20 dB at
5 kHz is possible with Dolby

C NR.

Input Jacks: Mic Jacks: 2

Minimum input level:

0.3 mV/600 ohms
Input impedance: 5 kohms

Line IN: 2

Minimum input level:

50 mV

Input impedance: 50 kohms

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TA72033

Outputs: Line OUT: 2
Std output level: 500 mV
500 mV (0 dB)
Opt load impedance:
Over 50 kohms
Headphone Jack: 1
Opt load impedance:
8-200 ohms
Motor: DC servo motor: 1
Heads: Rec/PB head:
Special Hard Permalloy
Erase head: Ferrite
Semiconductors: TR: 44 Diodes: 33
1C: 9 LED: 9
Power Consumption: 24 watts
Dimensions: 418(W) x 112(H) x 270(D)mm
(16-1/2" x 4-3/8" x 10-5/8")
Weight: 4.5 kg. (9.9 lbs.)

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

SERVICE PROCEDURES

1. Replacing the lamp
This unit used the lamp listed below.

Circuit No. Parts No. Description
PL-lOl 210090 PL14V 150m

Caution; Before replacing the lamp. Be sure to unplug the
power supply cable.

2. Instruction resistance measurement
Connect the insulating-resistance tester between the plug of
power supply cord and chassis.
Specifications: D model

G/W models

500V 3.3 t 0.33Mf2
500V more than lOMSt

3. Replacing the Hall 1C8
Cautions: As the position of leg of DN6838 and DN838
differ, use the same Hall IC when replacing.

IDN6339 (222558) DNBEE (222470)

Cut
0
5mm
l suznoo
Hold:

Printed side
i
25 3mm
7 i
SN27tDOl73 V

Ju mper lead

NA TD-1771

DNBSB

Cut

-2

FEATURES

Special Hard Permalloy Head Designed for Metal Tapes
The special process used to obtain the extra hard permalloy
head surface ensures greater resistance to wear and a better
saturation flux density in order to take full advantage of
high performance metal tapes. The hyperbolic shape also
improves head-to-tape contact.

MicrocomputerControlled Full-Logic Operation

The TA-2033 employs full logic operation with micro-
computer control in which separate solenoids are used for
the FF, REW, PLAY and AMCS modes to assure excellent
reliability.

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

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 (approximately) 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.

Dolby B and C Noise Reduction

Along with standard Dolby B NR, the TA-2033 laso has the
even more effective Dolby C NR system. Dolby C NR
reduces tape background noise by 20 dB at 5 kHz, 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 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 Space Ree Mute Button

Press this button while youre making a recording to auto-
matically enter a blank section of tape about five seconds
long. Once the blank section has been entered, the
TA-2033 will automatically switch to the REC-PAUSE
mode. To continue recording, simply press the PLAY
button. This function is convenient for temporarily
interrupting recording, editting tape during dubbing and
inserting unrecorded sections long enough for the auto-
matic continuous song location function to detect.

Semi-Automatic Tape Selection

The TA-2033 automatically senses when a normal position
cassette is inserted and sets the tape selector to the normal
position for you.

Full Auto-Stop Mechanism

Tape transport is automatically halted when the end of a

cassette is reached to safeguard both tapes and the tape
_ transport from undue strain.