HP 5334B Service Manual page 184

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
C w C )
Q1 (B)
Q l
(c)
QI(E)
4 2 (8)
Q2(c)
Q2(E)
Q3(B)
Q 3 K )
Q3(E)
Q4(W
Q4(C)
Q4(E)
Q 5 W
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