HP 6296A - Page 6

' Page
3
·-HP
P/N.06296-90001
changes - continued
CHANGE
·1
Jaif:..
page 6-5, change
C500
from
10,000
uF
to
~,000
uF,
HP
P/N
0180-1929. ·
CHANGE
2
On
the
component
location
drawing (schematic
apron)
make
the following changes:
a.
Interchange
collector
(C)
and
emitter
(E)
designations
for
transistor
Q853
on
the lower
right
hand
side
of drawing.
b.
Remove
TP21
designation
from
R205
on
center
left
hand
side
of
drawing.
The
TP21
designation
at
the bottom of
R310
is
unchanged.
c.
TP19
(bottom
center)
should point
to
bottom of
R300.
d
•.
Interchange
locations
of
Q401
and
CR809
at
bottom
left
of
drawing.
Electrical
connections remain
the
same.
CHANGE
3
.-
The
serial
number
prefix
of
the instrument
has
been changed
from
6D
to
70.
the
parts
list
and
on
the schematic,
make
e following changes:
Add
new
resistor
402,
600
ohm,
5
W,
HP
P/N
0811-1860
across
R309
(
150
ohm)
•
Change
TSO
1
to
HP
P
/N
9100-2184.
On
the
schematic, the primary
of
bias
trans-
former
T801
should be connected as
shown
in
the following sketch
for
115
Vac
operation.
For
230
Vac
operation,
the
jumpers between
lugs 1
and
3,
and
2
and
4
must
be
removed,
and
lugs 2
and
3
connected together. In ad-
dition,
a
new
power
transformer,
TSOO,
must
be
installed
in accordance with Option 18.
TIOI
•
3
CHANGE
4
Make
the following changes
in
the
parts
list:
Add
new
diode
CR603,
1N485B,
HP
P/N
1901-
0033.
Change
R313
to
1
k,
5%
(selected)
1/2
W,
HP
P/N
0686-1025.
Change
R707
to
2
W,
I.R.C.
Type·BWH,
HP
P/N
0811-1674.
Change
R601
to
422
ohm,
1/4
W,
HP
P/N
0698-
11590.
Change
R870
to
5 k
pot,
HP
P/N
2100-1824.
Change
R871
to
750
ohm,
11,
HP
P/N
0757-
0420.
Delete
R872.
Add
new
Zener diode
VR800,
4.22
V,
HP
PIN
1902-3070.
Q-1
the schematic,
delete
·R872
in
the meter
circuit
and
connect
VR800
in
its
place.
The
anode
of
VRSOO
goes
to
base
of
Q850
and
cathode goes
to
+15.4
V
reference.
Also,
connect
CR603
across
VR600
in
the
reference
circuit.
The
anode of
CR603
goes
to
+S
and
the cathode goes
to
+9.4
volts.
CHANGE
5
1lle
serial
number
prefix
of
the
instrument
has
been
changed
from
7D
to
7M.
In
the
parts
list,
delete
S1
(switch/indicator,
ON/OFF)
and
replace
with a
separate
toggle
switch
and
pilot
light
as follows:
51, toggle switch, Carling,
2FA53-73-SKI,
HP
P/N
3101-0984.
DS1,
pilot
light,
Neon,
Sloan,
HP
P/N
1450-0048. .
Schematic connections
to
the
new
switch
and
pilot
light
remain the
same
except
that
the
two
are
physcially
separate.