HP 4262A User Manual

-12vis
Measure
voltage
at
AOTP4
with
YES
Measure
voltages
at
A9TP5
and
|
NO
out
of
range.
1s
voltage
across
ASCS
more
|
NO
Check
A9C5,
ASCR2,
voltmeter.
Is
it
within
+11.95
A9TPS.
Are
they
within
the
than
4Vdc
?
Ti,
etc.
to +12. 05vdc ? following ranges ?
-12. 15V thru -11. 85V (A9TP5) YES
+4.85V thru +5. 15V (A9TP6)
YES
l
Does
voltage
at
A9U3
pin
6
|
NO_|
Check
A9U3,
A9R10-
NO
change
when
A9RS
is
RIl1,
C9,
etc.
Do
the
following
dc
voltages
exist
adjusted?
at A9TP3 when DC BIAS switch is
operated?
+1.425 thru 1.575V (1.5V) YES
Can
voltage
at
A9TP4
be
set
§YES
|
Adjust
at
ASTP4
to
+12V
+2.09
thru
2.31V
(2.2V)
to
+11.
95
to
+12.
05Vde
by
0.
05vde
with
AGR6.
Then
+5.7
thru6.3v
(
6V
)
NO
adjusting
A9R6
(+12V
ADJ.)?
perform
all
adjustments
for
<o
Does
voltage
at
A%Q3
base
Check
A9Q2,
etc.
42624,
OME
change
when
A9RS
is
ALL ARE FAULTY ARE [ adjusted ?
FAULTY
Check
ASR12
YES
L
NO
Check
A9U4,
ete.
thru
ASRIT.
Check Q3, ASR4,
ete.
Is voltage across A9C4 more | YES | Does voltage at ASUZ pin 6 YES
than 16Vde ? change with A9R6 adjustment ? —-L Check Q2, ASRZ, etc. ]
NO
l
5V
is
out of range: Is voltage at A9TP1 more | NO_| Check CRI, CR2,
Check
A9U2,
A9R5-R7,
ASCS,
than
6.
0Vde
?
A9C1-C3,
etc.
NO AICS, etc.
YES l
Does voltage at A9U1 pin 6 No Check A9U81-.m:9\9c't7‘;
Is
voltage
at
ASTP1
more
|
YES
chz.mge
when
A9R6
is
CR3,
A9R8-R9,
etc.
than
6.
0Vdc
?
Check
ASCRI1,
A9C4,
T1
]
Note
adjusted?
NOI
If
the
symptom
of
the
trouble
is
an
excessive
YES—{
ripple (more than 30mVpp for +12V and -12V, NO
Check
T1,
F1,
81,
line
module
and
50mVpp
for
+5V),
the
cause
of
failure
power
cal;le,
ete.
’
may
be
located
in
error
voltage
amplifier
Does
voltage
at
ASQL
base
Check
A9Q1,
etc.
(ASU1,
Q1,
Q3;
A9U2;
ASU3,
Q2,
Q4)
or
the
change
when
ASRS
is
filter
capacitors.
H
poor
voltage
regulation
adjusted
?
(dc output voltage changes over §.05 volts)
is occuring, the trouble may be in ASUL, U2 YES I
or U3,
Check Q1, ASRI,
ete.
Figure 8-27. A9 Power Supply Board Troubleshooting Tree.

HP 4262A Specifications

General

Brand	HP
Model	4262A
Category	Measuring Instruments
Language	English