TABLE 4-2. TROUBLESHOOTING CHART (Continued)
Symptom
Corrective Action
step
Probable Cause
9
c.
Defective Schmitt trigger 1A3U2 and
c.
(cont'd)
output amplifier circuit W1A3Q1
d.
Defective klystron 1V1
d.
Diagnose only. Return to depot for
repair.
10
CW Operation: Meter CAL
a.
Defective RF attenuator probe 1W1 5
a.
Diagnose only. Return to depot for
functioning but dB error
repair.
functioning
b . Defective power set probe 1W9
b.
Diagnose only. Return to depot for
repair.
c.
Diagnose only. Return to depot for
c. Defective detector 1Z1
repair
Diagnose only. Return to depot for repair.
11
according to specifications
No internal pulse
a.
Replace Modulator MD-1075/URM
12
a.
Defective Modulator MD-1075/URM
modulation
b.
Replace 1A3 (see paraegraph 4-d.)
R e p l a c e cable
c.
c.
Defective video cable C147363
d.
Broken wire on Pushbutton Board Assy
1A3
e.
Defective switch 1A3S1
e.
Replace Modulator MD-1075/URM
13
No internal square wave
a.
a.
Defective Modulator MD-1075/URM
modulation
b. Defective amplifier circuit (1A3Q1)