Sansui B 77 Service Manual

Page 2

B77

1. BLOCK DIAGRAM

Fig, 2-5

Aiflno 37

Fig 2-2 5' E-v-E m
I' [Z RESET
0' E E CLOCK
our 2 E :31 CLOCK ENABLE
~e' E QCARRV our
.7. IE ES
3' E @4' OUT
GND [0' 35

Top mew

CARRY OW-I-l-

Power Amp Indicator Drive Amp
IWIIIII Peak Level Indicator
0 [ Run e
'59 fly 9 nlClZL Spectrum Analyzer
Dinamic Drive Circuit +8
(a n0: 1!
\ Spectrum 3
\ 5
. Analyzer 85. 1| I 3 Fe
l 30H: n ' ® ® 5,:
L , 3 1:
mm \ s S 55
\ NH 3
\ / (r R Speakers SW 2 L g 5 E
r - slay nCso Ice 3.2?"
G 1' ' Speaker now ® cm:
2 ~ 0
Counter
-B
_ 4" Clock
Protector Phone (H1 @
(D no" G d
T (335
DC Servo Circuit +9 , OSC Circuit
2. BLOCK DIAGRAM OF IC
2-1. MSM4017 2-2. TA7318P
5 *r' 7 3' '9 our v9 HOLD
Fig. 2-1 Fig. 2-4 (99) g) (H
r-V_! I
'NPUT OUTPUT
omens _ (/4 Pmr Holds DC
may Guam 1: compressor Amp 2 L
CLOCK o I ¢ 4
CLOCK ESAELE CARRY our R _ Delects 3: 1/4 Power Hmd a DC a R
Es D D INPUT Circuit Compressor Am»L mam
C? <3?
v5 HOLD
(R)
°" 6 2 8 4' 2-3. N JM4558
NJM 45580