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Tektronix TM 515 - Page 66

Tektronix TM 515
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PRIMARY
Transformer
primary
power
arrives
via
F102,
S102,
S103,
S104
and
the
line-selector
block
P100
or
P200
.
S703
and
S104
are
chassis-mounted
thermal
cut-outs
that
in-
terrupt
primary
power
when
internal
temperatures
rise
above
a
sate
level
.
When
the
in-
strument
cools,
S103
and
S104
will
close
and
com-
plete
the primary
circuit
.
C100
shunts
line
tran-
sients
to
the
neutral
side
of
the
line
.
P100
is
wired
to
place
the
primary
win-
dings
in
parallel
for
nominal
110
V
line
voltage
operation
.
P200
is
wired to
place
the
primary
windings
in
series
for
220
V
nominal
line
voltage
operation
.
120
V/220
Vac
DETAILED
BLOCK
DIAGRAM
T1
25
Vac
WINDINGS
Five
secondary
windings
supply
raw
ac
power
~
25
Vac
across
pins
13A
and
B
of
each
compartment
.
Each
winding
is
shunted
at
the
connector
to
suppress
noise
.
+33
.5
V
and
-33
.5
V
SUPPLIES
Each
supply
is
referenced
to
the
grounded
center-tap
of
a
secondary
winding
.
Diode
bridge
_
CR112
supplies
rectified
do
in
each
polarity
.
C111
and
C112
+
C121
&
C122
tiller
the
do
before
ii
goes
to
each
of
the
compartments
.
8120
and
R122
provide
discharge paths
for
the
tllter
caps
when
power
is
removed
.
+33
.5
V
is
con-
nected
in
parallel to
pins
12A
and
B
of
each
compartment
.
-33
.5
V
is
connected
in
parallel
to
pins
8A
and
B
.
Pins
9A
and
B
are
all
connected
and
returned
to
frame
ground
.
17
.5
Vac
WINDING
Thi$
secondary
winding
supplies
raw
ac
power
across
pins
5A
and
B
of
each
compartment
in
17
.5
Vac
parallel
.
This
supply shares
loading
with
the
+11
.5
V
supply
.
+11
.5
V
SUPPLY
This
supply
is
developed
across
the 17
.5
Vac
winding
by
rectifier
diodes
CR130
and
CR132,
noisereduction
caps
C131
and
C132,
filter
caps
C135
&
C133
and
bleeder
resistor
8135
.
The
supply
is
provided
at
pins
2A
and
B
of
each
compartment
in
parallel
.
Pins
3A
and
B,
and
4A
and
B
of
each
compartment
provide a
return
to
the
center-tap
of
the
winding,
isolated
above
ground
by
8130
.
This
supply
shares
the
load
with
the 17
.5
Vac
supply
.
25
Vac
WINDINGS
+33
.5
V
Ground
-33
.5
V
+11
.5
V
Ground
Five
secondary
windings
supply
raw
ac
power
~
25
Vac
across
pins
1A
and
B
o1
each
compartment
.
Each
winding
is
shunted
at
the
connector
to
suppress
noise
.
2o2o-io

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