HP 203A - Page 67

Appendix
C
Model
203A
№
MANUAL
BACKDATING
CHANGES
MODEL 203A
VARIABLE
PHASE
FUNCTION
GENERATOR
Manual
Serial
Prefixed:
1201J-
-hp-
Part
No.
00203-99002
This
manual
backdating
sheet
makes
this
manual
applicable
to
earlier
instru-
ments.
Instrument-component
values
that
differ
from
those
in
the
manual,
yet
are
not
listed
in
the
backdating
sheet,
should
be
replaced
using
the
part
number
given
in
the
manual.
Instrument
Serial
Prefix
Make
Manual
Changes
Instrument
Serial
Prefix
Make
Manual
Changes
425-00770
and
below
1,
2, 3,
4
12011-02534
and
below
sm, ти, am
10193 and below
CHANGE
#1
Current
Part
No.
for
Transistor
A2Q3,
A2Q4,
A2Q7
and
A2Q8
is
1853-0016,
2N3638
and
is
a
recommended
replace-
ment
for
Part
No.
1853-0009,
2N274.
If
either
one
of
these
transistors
is
replaced
with
the
current
2N3638,
the
other
three
should
also
be
replaced
and
inductors
1,1
and
L2
replaced
with
a
56
ohm
resistor,
-hp-
Part
No.
0687-5601.
This
recommended
change
is
to
improve
phase
stability
at
high
temperatures.
CHANGE
#2
Change:
32and
83
to
HP
Part
No.
3101-0100
and
3101-0033,
respectively
(Page
6-10,
Table
6-1
and
Page
6-15,
Table
6-2).
|
Change:
W1
to
HP
Part
№.
8120-0078
(Page
6-10,
Table
6-1
and
Page
6-16,
Table
6-2).
| Miscellaneous Parts Change
Change: HP Part No, 1251-2357 (connector, power) to 1251-
0148
(Page
6-11,
Table
6-1
and
Page
6-14,
Table
6-2).
Change: HP Part No. 1400-0084 (Body, fuseholder) to 1400-
0110 (Page 6-11, Table 6-1 and Page 6-14, Table 6-2).
Add:
Nut,
retaining
for
1400-0110,
HP
Part
No.
1400-0111
(Раве
6-11,
Table
6-1
and
Page
6-14,
Table
6-2).
Add:
Knob,
fuseholder
black
for
1400-0110,
HP
Part
No.
ан
(Раве
6-11,
Table
6-1
and
Page
6-14,
Table
6-2).
Change: НР Part №. 00203-00211 (Panel, front) to 00203-
00201
(Page
6-11,
Table
6-1
and
Page
6-16,
Table
6-2).
Change: HP Part No. 00203-00212 (Panel, rear) to 00203-
00202 (Page 6-11, Table 6-1 and Page 6-16, Table 6-2),
Change: HP Part №. 00203-00213 (Panel, front) to 00203-
00203
(Page
6-11,
Table
6-1
and
Page
6-17,
Table
6-2),
Change: HP Part No. 00203-00214 (Panel, front) to 00203-
00204
(Page
6-11,
Table
6-1
and
Page
6-17,
Table
6-2),
Delete C4 C5 and thru C10
Add
C4
A,
B
0150-0119
С:
fxd,
cer,
2
x
0.
1uf
+20%,
250vdcw
Add
C5
thrn
C10
Not
assigned