Teac TASCAM 32 - Sync Relay

head
which
is
operating
as
reproduce
head
during
circuit
muting
as
shown
in
Fig.
and
cause
degrading
of
the
sound
quality
1-16(B).
The
SYNC
relay
on
and
off
timing
(SN).
To
prevent
this,
three
bias
traps
con-
depends
on
R363, C354,
and
by
C354,
R361
sisting
of
a
choke
coil
and
two
capacitors
respectively,
of
the
SYNC
relay
drive
circuits
(L101,
C136,
C101,
etc.)
including
Q202.
(This
part
of
the
circuit
is
14.
The
on
and
off
timings
of
the
SYNC
relay
now
shown
in
Fig.
1-16(A)).
are
so
adjusted
as
to
prevent
switching
noise
OPERATION OF
OUT
SELECT
SW.
INPUT
SYNC
REPRO
(SYNC SW. ON REPRO SW. ON
OUTPUT
|Omsec
300msec
'
i
1
'
:
1
\
'
\
|
1
ON
meleg
1
1
i
SYNC
RELAY
a
10Omsec
‘
!
t
Fig. 1-16 (B). SYNC Relay Operation Timing Chart
LEVEL (dB)
OdB=1V
U METER
;
|
Vv
€
F INPUT VR
INE |
ott
LINE
OUT
% TO VU METER
(INPUT)
-20
PHONES
/
uid!
(SYNC)
OUT (2/2) (REPRO)
— 30
—40
OUTPUT VR
oe
INPUT
RI56
a
SYNC RI22
ulolti72)
REPRO
RIZO
-60
-70
REPRODUCE
-80
Fig. 1-17. Level Diagram
76