TM 55-4920-390-13&P
i) If no, check waveforms as follows, using oscilloscope and referring to Table 6-4, Waveform Chart. At Test Point
2, if waveform is abnormal, check trigger circuits Q9 thru Q13.
k) Check operation of Strobex from external signal as follows. Turn " ernier" on rear of hand-held lamp full CCW
V
(oscillator off), apply +1 volt RMS sine wave at 20 Hz. to the signal input cable ("+" to pin A and "-" to B),
depress trigger.
I) Observe waveformat Test Point 4 and compare with Table 6-4, Test Point 4. If it appears faulty, check signal
amplifier section, Q4 thru Q7. Repair as required.
TABLE 6-4. WAVEFORM CHART
These waveforms are to be expected under the following conditions:
a) 28 VDC applied to Strobex.
b) "Vernier" on rear of hand-held lamp to off.
c) "Multi-turn Dial" on rear of hand-held lamp set to 350.
d) Trigger on hand-held lamp pulled.
e) 1 VRMS 20 Hz. sine wave in.
6-8
