TABLE 4-2. TROUBLESHOOTING CHART (Continued)
Step
Probable Cause
Symptom
Corrective Action
16
f.
Defective FM INT RANGE ADJ
Replace 1A3 (see paragraph 4-6d.)
f.
(cont'd)
potentiometer 1A3R17
17
No external FM operation
a.
Replace 1A3 (see paragraph 4-6d.)
Defective amplifier circuitry (1A3Q1
a.
and associated circuitry or 1A3U2)
b. Defective switch 1A3S1
b. Replace 1A3 (sea paragraph 4-6d.)
c.
Replace 1A3 (see paragraph 4-6d.)
c.
Broken wire on Pushbutton Board Assy
1A3
18
No internal sync undelayed
Defective Modulator MD-1075/URM
Replace Modulator MD-1075/URM (see
output
19
No delayed rf pulses
Defective Modulator MD-1075/URM
Replace Modulator MD-1075/URM (see
20
No external sync operation
Defective Modulator MD-1075/URM
Replace Modulator MD-1075/URM (see
with sine waves
21
No external sync operation
Defective Modulator MD-1075/URM
Replace Modulator MD-1075/URM (see
with pulses
