Sony TC-458 - Amp Section

1-1.
BLOCK
DIAGRAM
SECTION 1
OUTLINE
— Amp Section —
L
CH
LINE
R-CH
is
not
shown.
REC
VOL
CNI901-7
n
ime) ||! 2
4901
[RECHPB|
REC LEVEL
CNI902
(E)
PH9OT LB
LINE AMP
0404, 0405
$301 $904
PLA YBACK 9 Bet
BIAS OSC
MUTING (OFF)
BIAS OSC
0351, 0352
BIAS
Q301: Acts as a dummy
load for the bias osc
BIAS TRAP C302 circuit in the playback
mode,
§=> RH901
METER LEVEL [VU METER |
R427 VU METER
HEADPHONE/
METER AMP
Q406
PLAYBACK
01
[BEADPHONE:
4
—
EQUALIZER
is
Vf}
¥903
$303-3
|
MUTING
0403
LINE
OUT
VOL
LINE
OUT
77.
R429
yyy»)
CNJ901-3
$301
record/playback
......
record
Z
$303
TAPE
SPEED.......
19
$701-2
MONITOR..........
TAPE
WT.
$904
bias
osc
muting
......
OFF
—
System
Control
Section
—
:
SOLENOID
DRIVER
sensing
nets
;
POLE
$901
Bs
(Pont
808
s
Te
bats
P-FLOP
SOLENOID
a
EA
ROR
TION
a
(REVERSE
MODE)
pus02
|
PM901
0)
0601,
Q602
HEAD
ROTATION
S805
—
_-_|-o—™
moTor
SOLENOID
a
RY6O1
{
©
ROTATION
>
OFF
Th
REVERSE
RELAY
T
|
REVERSING
on
©
SENSING
¢—°——
ae
oko
o™
CIRCUIT
POLE
or
°
$903
TT
ei
\
SHUT-OFF
s
|
|
b
REGULATOR
E
MOTOR
STOP
DETECTOR”
|
m4
Ot
NO
roy
!
Ol
J
r
Q2
~
05
-
FLIP-FLOP
INTERMITTENT
{TENSION
.
CONTROL
REGULATOR
Q12,
Q13
ae
$801
(OVENSC
sarecseias
Se
hose
ee
STOP
=O
$804
sensing
pole......-----.--
STOP
SERVO
F
$805
playback...
..--+-0000
sToP
CONTROL
AMP
me
nee
$901,
902
head
rotation
detector.....-
playback
C651,
Q901
$903
shut-off
........-0205005
OFF
(no
tape
loaded)
SYSTEM CONTROL
CIRCUIT BOARD (2)
0601 ~ 608: SYSTEM CONTROL
CIRCUIT BOARD (1)
Qi ~ 16: