Tektronix 7834 - Page 25

7844
/
R ,
R7903
AND
7904
TRANSFORMER
REPLACEMENT
Reference
:
7844
/ R
Service
Manual
P /
N
070-1676-01
R7903
Service
Manual
P /
N
070-1464-00
7904
Service
Manual
P / N
070-1195-00
7904
Service
Manual
B26
&
Up P
/ N
070-2390-00
The
power
transformer
,
P /
N
120-0742-00
,
previously
used
in
the
above
instru
ments
,
has
been
replaced
by P
/ N
120-1250-00
.
The
only
change
is
that
on
the
+5
volt
light
winding ,
instead
of
increasing
wire
size ,
an
extra
wire
was
added
.
These
wires
are
terminals
# 4
and #
16
,
and
are
now 3
large
tinned
copper
wires
.
It
is
difficult
to
connect
these
wires ,
as
the
holes
are
small ,
but
with
care
it can
be
done
.
Below
are
drawings
which
should
help
in
wiring .
2
el
ORANGE
1500v
IB
ORANGE
CROWN
16
15
14
13
12
Door
+130
V
12
+34 V
གཙཀ་
བ
།
18
21
20
3
Blue
Black
4:17
V
COMMON
B
1177
lig
17
1
llllllll
:
54V
6.7V
io
9
7
6
5
wet
BLACK
000
1
©
COMMON
LICHTSLOGI
5V
Jualdade
leal
3
+
7V
8
20
6.3
V
RMS
INSUL
FOR
3KV
DCW
21
--John Eaton
58/511
,
Ext
.
6902
C
-11
June 27 , 1980
Issue 10-13