Table
8-12.
Oscillaror Section Nonnal Voltages
(see Notes
1,
2,
3)
8-423. Troubleshooting of the faults listed in paragraph 8-422 is discussed in the following paragraphs.
VOLTAGE POINT
C3/R3
CR5/C13
CwC)
Q1 (B)
Ql
(c)
QI(E)
42 (8)
Q2(c)
Q2(E)
Q3(B)
Q3K)
Q3(E)
Q4(W
Q4(C)
Q4(E)
Q5W
Q5(C)
Q5(E)
Q9(B)
Q9(C)
Qg(E)
NOTES
8-424. NO OUTPUT. This is usually easy to repair by simple signal tracing. Localized fault finding (to actual
defective component) can be somewhat more difficult if the problem is in the main oscillator circuit
(Ql,
Q2,
and
AGC).
If the fault appears to be the oscillator section and does not yield to normal troubleshooting tech-
HP
5334B
-
Service Manual
8-64
1.
All voltages taken with
12V
oscillator supply.
2.
Voltages are approximate and will vary slightly from unit-to-unit.
3.
All ac voltages are sine waves except
Q2(E)
and
Q3(E).
4.
This dc voltage may be measured with a standard dc voltmeter. All other voltages should be measured with an
oscilloscope and high impedance probe to minimize circuit loading.
5.
Waveform is
-+
.06V.
6.
Waveform is slightly flattened on the bottom.
7.
This is the
ACC
voltage. Value shown is nominal with the oscillator operating. If the oscillator is not oscillating,
the
AGC voltage will be
=
+
2.5V.
8.
Measure both ac and dc voltages with an oscilloscope and a high impedance probe to minimize circuit loading.
9.
AC
voltage at
Q9(C)
measured with
50i2
load on the output.
REMARKS
Note
8
Notes
4
and
7
Note
4
Note
8
Note
4
Note
8
Note
4
Note
8
Notes
4
and
5
Note
8
Note
4
Notes
4
and
6
Note
4
Note
4
Note
4
Note
8
Notes
8
and
9
Note
8
Note
8, 9
Note
8, 9
Note
8
NORMAL
AC
(p-p)
1
to
4
0
1
0
0.9
0
2.7
0.06
2.7
0
2.4
0
0
0
2.7
0
2.8
2.8
5.1
2.5
VOLTAGES
DC
-1.5
6.3
0.75
.
5.5
0.03
2.7
5.6
2
5.6
11.8
4.9
6.3
10.3
5.6
3.1
11.8
2.6
2.8
11.8
1.9
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