Sony ta 177r

Page 1

SERVICE MANUAL
INTEGRATED STEREO AMPLIFIER

TA-I'I'IR

Now: TA-177R is an integrated stereo amplifier unit in FH-150R.

1. 2'8 OPERATION
1-1. TC9176PIIC203)

TC9176P is an IC served as electronic volume.
This IC is capable of controlling the attenuation
from 0 dB to -76 dB at intervals of 2 dB.

L-CH 0UT1
L-CH IN 1
L-CH IN 2
srnoae 6

DATA 0

R-CH IN 2

x
9'} v v
(D
H R-CH OUT 2
GND
@ CLOCK

J) V35
R-CH OUT1

N

x I

a

/R-CH IN 1
\

a

J 0ND

*{

a Pin Functions
IN 2 OUT 2 IN 1 OUT 1
@ R-CH our l, @ L-CH OUTl *GD-% «9 l.:9__°/°_ {5 2
Output pin for ID dB step attenuator. 005 GB
The signal applied to L/R-CH IN I attenuates 8 I
steps from 0 to -70 dB at intervals of 10 dB. >-00- ._or O-t
-2ua - mus
@ R-CH lN l, @ L-CH IN I
Input pin for 10 dB step attenuator. i an? $062:
@ R-CH our 2, ® L~CH our: H
Output pin for 2 dB step attenuator. -saB 40:;
The signal applied to L/R-CH [N 2 attenuates 5
steps from 0 to -8 dB at intervals of 2 dB 0-1 ,H
-BdB -lOdB
@ R-CH IN 2, ® L-CH 1N2
Input pin for 2 dB step attenuatori >-o/o-- >-o/o-t
-oo ~5068
attenuator 2 E
The attenuator is composed of the resistors and
the analog switches m?
Attenuator l attenuates 10 dB steps from 0 to
770 dB and attenuator 2 attenuates 2dB steps
t-o/o--
from 0 to 8 dB. -7uaB
Total attenuation is 2 dB steps from 0 to -76 dB. E menu), 1
.Ta
GND

-TA-1 -