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HP 654A - Replaceable Parts

HP 654A
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à
MANUAL
CHANGES
MODEL
654A
TEST
OSCILLATOR
-hp-
Part
Number
00654-90002
I
New
or
Revised
Item
ERRATA:
Page
6-6,
Table
6-1,
Chassis
Mounted
Components
and
Assemblies.
Add
Part
No.
5061-0735
TUNER
ASSEMBLY
(consists
of
Cl
A,
C1B,
Cl
C
and
MP14).
Add "
Part
of
5061-0735"
to
CIA,
B,
C
and
MP14.
ADDENDA:
CHANGE
1
FOR
SERIAL
NUMBERS
0951A01701
AND
ABOVE.
Pages
6-3
and
6-4,
Table
6-1,
and
Page
7-7/7-8,
Schematic
No.
2.
Add
A2CR25,
1902-0222
Diode
Breakdown
14
V.
Delete
A2R70.
Add
A2CR26,
1902-0554
Diode
Breakdown
10 V.
Delete
A2R73.
Change
R61
and
R62
to
factory
selected
parts,
40.2
SZ
0698-3262.
CHANGE
2
FOR
SERIAL
NUMBERS
0951A02261
AND
ABOVE.
Page
4-4,
Paragraphs
4-38
through
4-40.
Replace
with
the
following:
4-38.
The
regulated
power
supply
provides
all
voltages
required
by
the
test
oscillator
circuits.
The
power
supply
consists of
a +
31
V
series
regulated
supply
and
a
-
26
V
series
regulated
supply.
Each
supply
is
referenced
to
a
6.2
V
zener
diode,
CR16
and
CR20
respectively.
4-39.
The +
31
V
and
-
26
V
series
regulated
supplies
each
contain
an
IC
which
compares
a
portion
of
the
output (
pin
2)
with
the
reference
voltage,
6.2
V.
For
a +
31
V
or
-
26
V
output,
R40
and
R41
are
adjusted
to
provide
62
V
at
pin
2
of
the
IC.
When
the
output
voltage
changes
due
to
loading,
the
voltage
at
pin
2
of
the
IC
changes
and
the
IC
drives
Ql,
Al
02
and
Al
Q3
to
correct
the
output
voltage.
4-40.
Both
supplies
have
a
current
limiting
capability.
When
the
output
current
of
either
supply
exceeds
330
mA,
the
current
limiting
transistor (
04
for
the
positive
and
07
for
the
negative
supply)
begins
to
conduct
and
drives
the
regulating
circuit.
The
output
voltage
is
then
reduced
until
the
load
causing
excessive
current
is
removed.
Page
5-12,
Figure
14.
Replace
the
location
of
Al
adjustment
as
follows.
A3R7e
0
,
MI
1 o
00
Al
Al
R40
El
A1M41
'
(5.3
--
o
o
42R4
42R3
•
A2TP2
Page
5-13,
Paragraph
5-45.
Replace
Steps
b
and
c
with
the
following:
b.
Adjust
Al
R40
1+
30
V
adjust)
for
31, ±
02
V.
c.
Connect
the
dc
voltmeter
to
the
power
supply
negative
output (
Al
pin
13).
Adjust
Al
R41 (- 25
V
ADJUST)
for
26
V ±
0.5
V.
Page
5-20.
Delete
the
last
sentence
in
b
and
all
of
Step
c.
Refer
to
Paragraph
5-78
when
troublshooting
the
power
supply.
Page
5-22,
Paragraph
5-78.
In
the
NOTE,
change
the
capacitor
numbers
to "
C14"
and "
C15"
and
the
rating
to "
400
V".
Page
6-2,
Table
6-1.
Replaceable
Parts.
Replace
the
Al
assembly
parts
list (-
hp-
Part
No.
00654-66501)
with
the
Al
assembly (-
hp-
Part
No.
00653-66507)
listed
on
Page
2
of
this
Change
Sheet.
Page
6-6,
Table
6-1.
Under "
Chassis
Mounted
Components"
change
the
part
numbers
and
descriptions
of
the
following:
01,
1854-0063,
TSTR:Si
NPN,
2N3055
02,
1853-0305,
TSTR:Si
PNP,
2N5875
Page
7-7/7-8.
Replace
Al
circuit
diagram
with
the
following:
250
sui7.r
((nagi-66507)
4
Si
V
1018K
CR11
6.2V
Page
7-11,
Figure
7-5.
Replace
Al
Component
Locator
with
the
following:
2
NC
15
•
-
CR
I
I-
-
RIO -
t 4
•
- C l 5
—
—
Ci4
—
-
CRI-
-
CP2
-- -
CR5-
--CA3 -
-
C6
-
- R
it)
-
-
R6
-
-
R43
-
-C3-
-
Re-
-
RH-
-
R12-
-ces-
-CR.9 -
-R27--
H
-
CR20-
P72
•
3'7
,9
eiret2
71,13
L .
ro
114
7
00653 -
66507
-CR4-
0'0:1
-CRI2-
-
R5--
IC
6(
73
-c
e-
-
RS?- -
CP26-
C2
—C22
--
- C
R6
--
(A!)
-
R3-
-
R2
Ci9 —
-
CR22-
-
CR23-
-
R39 —
-C
R25 -
—
C21-
3
96
Th
28
April
1975
Supplement
A
for
00654-90002

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