IEC 30 Series - Page 45

SECTION 5
Table 5-1. Troubleshooting Guide (Continued)
Symptom/Step
Possible Cause
Remarks
m.
AM or FM on output. 1.
Power supply ripple.
See step 20.
2.
Frequency cont rol oscillations.
See step 19.
3.
Current control oscillations.
See step 18.
4.
Misadjusted R203 (F34).
6. FREQENCY
CALIBRATION
IMPROPER
a.
Large freqency
error in specific
FREQ mult
position.
1.
2.
Faulty C1 through C4.
Faulty S2 contact.
b.
Large freq. error
in all FREQ mult
positions.
1.
2.
Q4 open drain.
VLS faulty (C25 shorted)
See step 16.
3.
Misadjusted R5 or tuning assy
alignment.
out of
4.
IC4
faulty.
5. Frequency Control faulty.
See step 19.
6.
Current Control faulty.
See step 18.
7. INSUFFICIENT
FREQ RANGE
a.
<..1000: 1 VCG
1.
Misadjustment of R205 and R1.
2. Failure in frequency control section.
3. Misadjustment of R5, or tuning assembly
out of mechanical alignment.
b.
< 1000:1 Sweep
1.
Misadjustment of R205 and R1.
2.
Failure in frequency control section.
3.
Misadjustment of R5 or R210, or tuning assembly
out of mechanical alignment.
c.
<.. 1000: 1 Dial Range
1.
Misadjustment of R205 and R1.
2.
Misadj ustment of R5 or tuning assembly
out of mechanical alignment.
3.
Failure in frequency control section.
See step 19.
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