Onkyo TA 2044 Service Manual
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Page 1
ONKYO
TA72044
SERIAL N0. 3166
SERVICE MANUAL
STEREO CASSETTE
TAPE DECK
MODEL TA-2044
Black and silver models
UDN, UDC, UD 120v AC, 60Hz
UGV, UG 220v AC, sonz
UW 120 or 220v Ac, 50/60Hz
UQA, UQB 240v Ac, 50Hz
SAFETY-RELATED COMPONENT WARNINGII SPECIFICAT|ON$
COMPONENTS IDENTIFIED BY MARK A ON
THE SCHEMATIC DIAGRAM AND IN THE PARTS Traék Format: 4 tracks, 2 channels
LIST ARE CRITICAL FOR RISK OF FIRE AND Erasmg System: AC erase
ELECTRIC SHOCK. REPLACE THESE COM- Tape Speed: 4.8 cm/sec. (1-7/8 Lps.)
PONENTS WITH ONKYO PARTS WHOSE PARTS W°w& Flutter: 0.04%(WRMS)
NUMBERS APPEAR AS SHOWN IN THIS MANUAL. Frequency Resxvonse: 20-16000 Hz
MAKE LEAKAGE-CURRENT 0R RESISTANCE
MEASUREMENTS TO DETERMINE THAT
EXPOSED PARTS ARE ACCEPTABLY IN;
SULATED FROM THE SUPPLY CIRCUIT BEFORE
RETURNING THE APPLIANCE TO THE
CUSTOMER.
ONKYO®
Alllllll BflMPflNlNISI
Signal-lo-Noise Ratio:
Input Jacks:
(SO-15,000 Hz i 3 dB)
(normal position tape)
20-17,000 Hz
(Cm-16,000 112 i 3 dB)
(high position tape)
20- 19,000 Hz
(SO-17,000 Hz i 3dB)
(metal positiOn tape)
60 dB (metal position tape,
Dolby NR out)
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.
Line IN: 2
Minimum input level: SOmV
Input impedance: 50 kohms
Page 2
TA-2044
Outputs: Line OUT: 2
Std output level: SOOmV (0 dB)
Opt load impedance:
over 50 kohms
Headphone Jack: 1
Opt load impedance:
8 -- 200 ohms
Motors: DC servo motor: 1
DC motor: 2
Heads: Rec/pb head: Special Hard
Permalloy
Erase head: Ferrite
Semiconductors: TR: 57 Diodes: 36 IC: 9
LED: 10
Power Consumption: 27 watts
Dimensions: 435(W) x 112(H) x 371(D) mm
(171/8 X 4-3/8 x 14-5/8)
Weight: 6.0 kg. (13.2 lbs.)
Specifications and external appearance are subject to change
without notice because of product improvements.
SERVICE PROCEDURES
1. Replacing the lamps
This unit used the lamps listed below.
Circuit No. Parts No. Description
PL-902 210149 PL14V 0.06A W3.0
PL-901 210165 PL14V ISOmA
Caution; Before replacing the lamps. be sure to unplug
the power supply cable.
. Instruction resistance measurement
Connect the insulating-resistance tester between the
plug of power supply cord and chassis.
Specifications; D model 500 V 3.3 i 0.33 MB
G/W models 500 V more than 10 M9
. Replacing the Hall [Cs
Cautions: As the position of leg of DN6838 and DN838
differ, use the same Hall IC when replacing.
DN6838 (222558! DN838 (222470)
Cut Printed side
1
5mm t
l 9427190251 3mm
Holder 6
snmsoi 73 V
Cut
Jumper lead
NATD-1755
._2_
FEATURES
Microcomputer Controlled Multi-Program System
A highly efficient microcomputer is used to provide a wide
range of programmable functions. The song location
function rapidly winds tape directly to the beginning of
any particular song on a cassette up to nine songs away
from the present location in either direction. A repeat
function repeatedly plays a particular song or the section
of a cassette between the [000] tape connter point and
either the beginning or end of the cassette up to ten times.
Theres also an automatic music search function that plays
about the first eight seconds of each song in the forward
or reverse direction.
Auto Space Rec 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-2044
will automatically switch to the REC-PAUSE mode. To
continue recording, simply press the PLAY button. This
function is convenient for temporarily interrupting record-
ing, editting tape during dUbbing and inserting unrecorded
sections long enough for the automatic continuous song
location function to detect.
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.
2-Motor Tape Transport with Separate Head Assembly
Motor
The tape transport system, along with the heads, determines
the level of performance of a cassette deck. To guarantee
extremely stable and accurate tranSport the TA-2044
uses a DC servo controlled capstan motor. This motor is
frequency or instantaneous changes in load. A highly
reliable, simple drive transmission system and precision
vertical cassette holder further enhance overall accuracy
and stability. As a result, wow and flutter is under 0.04%.
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
Along with standard Dolby B NR, the TA-2044 also 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 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.