Teac A-450 - FREQUENCY & VOLTAGE CONVERSION

QIOl 2SA72I1(T) @102_ 2SC1327(T) Q103 28¢1327(T.s)
IPLAY -44dB PLAY -55dB)
9.IV RIO3 56k REC -31dB REC -41dB Ri44 560
R102
aie f clos cue DOLBY B TYPE PROCESSOR
C104
470P
5
7yRIO4
47k
z
/35V(DT)
470/16v.
R
100
mv
(-17.8dB)
at
test
point
ia
7 8 9
cio2
Se
h262
om
Seon
Sa
WO/I6V(DT)
VR404
20kAx2
R14 100k
Clio
R108 68(U)} 100710V
Ri2! 47k
Lio!
1.2mH
101 tice’. ‘eit Quo 2S¢828(S)
33/10V 4.7 kl)
6 ,
tie
Ru2
RUB
7248 rt 8201) 6801) C136
=>
107
i6v
lL
<>
R/P
HEAD
_
R
<4
=
PLAY»
REC
@
5780
Be
214
|
PHONES
JIO3
JIO4—A
OQ
ine
we
2
saad
=
q
@
RCH
.]
2
JI04-B
l i
u1o2 :
402 page
g R120 2.7k
'vVR403 100k
RIGI 22k
VR401 50kax2 2
VR402 5OkAx2
DOLBY FM!
LGAL__o
€404 10/25V
L103 1OmH
R128 2.7k
R129 12k
C135 RI64._-3.3k
C137 10/16V
C13) 47/6.3V
7
cli8 0.0068/50V
(0.7)
Ci? O.012tu)
C126 0.47/35V
2
P03
Q401 2SK30A(Y) | QI04 2SC644(T)
eae
R308
100k
;
{a
$401
MUTING- SW
(PLAY LE VER)
D302
ERASE HEAD
C305 1000/16V =
(2w) FR2-02
361
R307 470
C306 1000/16V
¢307
363
2.2/25v 0:
€303 1000/35V €304 1000/25V
R301 560(3w)
C301 47/25V
1000/35V
R356 3.3k
R362 33k
PAUSE LEVER
S
re REED sw {5
$109 AUTO STOP SOLENOID sno
R-CH
1
BRAKE LEVER
CAPSTAN ac goov MIOL VU
MOTOR ———— ee
0.033
+
120
b
-
NOTES
FUSE
0.54
a
°
/
/
1.
ALL
RESISTORS
ARE
4
WATT,
5%,
UNLESS
MARKED
OTHERWISE.
OQ OQ |"? Q vu vu RESISTOR VALUES ARE IN OHMS (k= 1,000 OHMS, M= 1,000,000 OHMS).
AC POWER IN [Power] PLIO3 = PLIO2 PLIO! ALL CAPACITOR VALUES ARE IN MICROFARADS (p=PICOF ARADS).
TAPE RUN REC DOLBY ~) G) . SCHEMATIC DIAGRAM SHOWN FOR LEFT CHANNEL EXCEPT FOR
5 a
SOME OF THE COMPONENTS.
. DC VOLTAGES WERE MEASURED DURING PLAY MODE.
SIGNAL LEVELS (dB) WERE MEASURED WITH INPUT AND OUTPUT
CONTROLS AT SPECIFIED POSITION.
. READING IN dB REFERENCED TO 0d8=0.775V.