Troubleshooting Tree - HP 3300A Technical Manual

Model 3300A
SYMPTOM
Half of sine wave clipped on both channels.
Loss of square wave symmetry at lowest
range.
No oscillation on X.1 and X.01 RANGE; dial
at 1.
+20 volts ok when oven cold, high when
oven hot.
Slow symmetry drift.
Table 5-4. Troubleshooting Aid (Cont'd)
Check A14Q5 and A14Q7.
The synthesizer waveform is symmetrical about 10 volts at the base of
A14Q5 and at the corresponding junctions along the voltage divider
R10 to R15 and R25 to R20.
Inoperative oven, open thermal fuse.
Check A11Q8.
Check A11Q1, A11Q2.
Check A14CR21, A14CR20, A11Q6, A11Q7.
Figure 5-8. Troubleshooting Tree
5-9
POSSIBLE CAUSE
Section V