Onkyo TA 2050 Service Manual

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SERIAL NO. 3076

ONIIYO. SERVICE MANUAL

STEREO CASSETTE
TAPE DECK
MODEL TA-2050

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TABLE OF CONTENTS

Item Page

Specifications

Electrical adjustment procedures
Exploded View

Features

Service procedures

Precautions

Mechanism operation
Mechanism adjustments
Mechanism exploded view

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Printed circuit board View 9
Schematic diagram 11
Printed circuit board-parts list 14
Block diagram 15
Circuit description 15
Componeni location 17
Packing procedures 18

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SPECIFICATIONS

Track System :
Recording System :
Erasing System :
Tape Speed :

Wow and Flutter :
Frequency Response :

Signal -to-Noise Ratio :

Input Jacks:

4-track, 2-channel stereo
AC bias
AC erase
4.8 cm/sec.
0.045% (WRMS)
20 - 17,000 Hz
(30 - 16,000 H2 2 3 dB)
(normal position tape)
20 - 18,000 Hz
(30 - 17,000 Hz 1 3:38)
(high position tape)
20 - 19,000 Hz
(30 -18,000 Hz 1 3 d8)
(metal position tape)
Dolby NR out, 60 dB
(metal position tape)
A noise reduction of 10 dB
above 5 kHz and 5 dB at
1 kHz is possible with the
Dolby NR in
Microphone Jacks : 2
Minimum input level :
0.3 mV/600 9
Input impedance : 5 k9
Optimum mic impedance :
600 f2 - 50 k0
Line In : 2
Minimum input level :
50 mV
Input impedance : 50 k9

Outputs :

Motor :

Heads :
Components :

Power Supply :
Power Consumption :
.aDimensions :

Weight :
Accessories :

Line Out : 2
Output level :
350 mV (at 0 dB)
Optimum load impedance:
over 50 kn
Headphone Jack : I
8 52/ 200 S2
PLL DD motor (capstan)
+ DC motor
Special hard permalloy heads
TR :53 Diodes :29 IC :6
LED : 4
AC 120 V/GO Hz,
220 V/50 Hz, 120/120 V
50 [60 Hz, 240V/50 Hz
35 W
418(W)x120(H)x 270(D)mm
16-1/2" x 4-3/4" x 10-5/8"
6.4 kg (14.1 lbs.)

.Pin-type connecting cords : 2

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

ELECTRICAL ADJUSTMENT PROCEDURES

PRECAUTIONS
1. Tape required:

2. Instrument required:

(1) Blank tape (1) AC VTVM
MAXELL UD-XL/l (Normal) (2) Frequency counter
UD-XL/ N (High) (3) AF oscillator
MX (Metal) (4) Attenuator
(2) Test tape
VICTOR VTT-658 10 kHZ.-15 dB 3. The switches and controls should be set as follows
TEAC MTT-1 11 3 kHz,-10 dB unless otherwise specified.
MIT-150 Dolby level calibration Tape selector switch : Normal
tone. Dolby NR switch 1 Out
Accubias adjust : Center
1. PLAY BACK MODE ADJUSTMENT
1-1 Head azimuth adjustment
PROCEDURES : VTVM
1) Play the 10 kHz portion of the test tape 47 kg) (7)

VTT-658 back. Adjust the head azimuth 51m
adjusting screw for maximum V.T.V.M. read. -' --va_fj.e
2) If the peak output reads of the right and left :1 TP 2
channels are different, set the screw to obtain ' '
the mechanical center between the peaks.
3) After adjustment, lock the screw with bond.