IEC 30 Series - Page 44

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SECTION 5
Table 5-1. Troubleshooting Guide (Continued)
Symptom/Step
Possible Cause
Remarks
5.
OUTPUT WAVE-
FORMS
IMPROPER
a.
Time nonsymmetry
at all dial fre-
quencies
( 41.
rv,
SlI ).
b.
Time nonsymmetry
at low dial
frequencies
( 41,
rv,
JlJ ).
c.
Amplitude,
nonsymmetry.
d.
All waveforms
clipped.
e.
Sine and Triangle
waveforms clipped.
1.
R18, R205
or R1 misadjusted.
2.
Current control problems.
1.
R18
misadjusted.
2.
Current control problems.
3.
Leaky Q2 or Q3 (collector to base).
4.
Leaky CR58 or Q4.
5.
Shorted or leaky CR4. CR5, CR8 or CR9.
1.
R54
misadjusted.
2. VLS faulty.
Output amplifier faulty.
See step 18.
See step 18.
See step 16.
See part 14.
Misadjusted R29.
1.
Sine
shaper or sine amplifier faulty.
2.
Sine
shaper calibration.
VLS faulty.
Leaky components: CR9. CR8, CR4. CR5, CR58,
Q2 (C to B) or Q3 (collector to base).
C1, C2, C3, C4, or C5.
1. Output amplifier trouble.
2.
Open
C52, C54, C56, or C57.
Variable pulse rise and fall
excessive (F33, F34).
1.
Improper triangle input level, amplitude
f.
Sinewave only
clipped.
g.
Squarewave
clipped.
h.
Nonlinear triangle
in all FREQ MULT
positions.
i.
Nonlinear triangle
in specific FREQ
MULT positions.
See step 21.
See step 16.
j.
Excessive over-
shoot or ringing on
squarewave.
See step 14.
k.
Excessive rise and
fall times on
variable pulse.
See step 24.
1.
Excessive sine
See step 4.
distortion.
symmetry, time symmetry, or linearity.
2. Sine shaper calibration improper.
3. Sine shaper faulty. See step 21.
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