Sony ta n 902 service manual

Page 1

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MICROFILM

SPECIFICATIONS

Continuous RMS power output
AI 20 Hz - 20 kHz
130 + 130 watts (8 ohms)
200 + 200 watts (4 ohms)
According to DIN 45500
130 + 130 watts (8 ohms)
200 + 200 watts (4 ohms)
Mono 400 watts (8 ohms)
Power bandwidth (IHF)
5 Hz - 80 kHz
Slew rate 120 Vly sec (8 ohms)
Harmonic distortion Less than 0.1% (8 ohms)
W med Mimi Less than 02% (stereo 4 ohms. mono 8
ohms)
Intermodulation (IM) distortion
(60 (42:7 m: 4.1, at rated output)
Less than (11% (8 ohms)
Less than 02% (stereo 4 ohms, mono 8
ohms)
Frequency response DC - 100 kHz :3 dB (DIRECT INPUT)
5 Hz , 100 kHz :2 dB (C COUPLED
INPUT)
Signal-lonoise ratio Greater than 120 dB (short-circuited
input, 8 ohms)
110 dB (8 ohms, 78 IHF)
Less than 30W (8 ohms, A network)
50 (8 ohms, 1 kHz)

Residual noise
Damping factor

Inputs Sensitivity 13 v
(For ratedoulpul) impedance 50 k ohms
Outputs SPEAKER terminals

Accept speakers of 4 , 16 ohms in
stereo and 8 , 16 ohms in mono

General
System Prepower stage
1st : Bootstrapped double cascade
FET differential amp

2nd: Bootstrapped cascode differen-
tial amp with current-mirror load
3rd: Emitter follower SEPP output
Power stage
No NFB loop, pure-complementary
SEPP output in class A (non-
switching type) operation
Power supply
Powerful large power transformers
installed in L and Ft channels
independently

Power requirements 220 V ac, 50/60 Hz
Power consumption 320 watts
Dimensions

Approx. 480 x 155 x 485 mm (w/h/d)
(191- x 12 x 19]: inches)
including proiecting parts and controls

Weight Approx. 28 kg (12 lb 11 02), net

315 kg (14 lb 5 oz), in shipnng
canon

-Continued on page 2-

SAFETV-RELATED COMPONENT WARNINGI!

COMPONENTS IDENTIFIED BY SHADING AND MARK

A ON THE SCHEMATIC DIAGRAMS AND INTHE
PARTS LIST ARE CRITICAL TO SAFE OPERAIION.
REPLACE THESE COMPONENTS WITH SONV PARTS
WHOSE PART NUMBERS APPEAR AS SHOWN IN THIS
MANUAL OR IN SUPPLEMENTS PUBLISHED BY SDNVL

I STEREII POWER AMPLIFIER

SONY;

ébBir

Page 2

TA-N902

Unit :
430

HFI

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o FEATUR ES

Amplifier makes possible Direct sound through direct
connection

The TA-N902 permits direct connection of high quality
digital sound sources such as PCM or CD eliminating
the need for a preamplifier. This feature enables you to
enjoy the best possible sound, with minimum impair-
ment of tone quality.

Operation is simple. Set the INPUT SELECTOR switch to
VARIABLE, connect a PCM processor or CD player
directly to the VARIABLE lNPUT terminals, and adjust
the sound volume and balance using the AI'l'ENUATOFl
controls. The tone quality is much better compared to
operation with a preamplifier.

No NFB loop power stage, achieved by a combination of
Hi-iT power transistors and a distortion reduction circuit
By a combination of HiAfT power transistors and a distor-
tion reduction circuit (a circuit to control the driving
voltage so as to improve linearity for reducing distortion,
producing class A operation without cut-off in almost all
operating areas of the output transistors), the distortion
factor of the power stage itself is improved by almost a
full digit compared with that of the conventional power
stage.

The N FB loop from the power stage to the voltage ampli-
fying stage can be eliminated, resulting in a significant
reduction in TIM (Transient lntermodulation Distortion)
and freeing the voltage amplifying stage from any
Speaker load reaction.

mm

OPERATION switch to select stereo amplifier or
monaural amplifier mode:

The TA-N902 is usable either as a stereo amplifier or a
monaural amplifier. if the OPERATION switch is set to
monaural amplifier mode, a large output power of 400 W
(8 ohms) can be obtained. You can enjoy powerful
dynamic sound by connecting two TA-NQOZs, one to the
left and one to the right channel.