TM 5-3610-257-14
Table 3-6. DIRECT/GENERAL SUPPORT TROUBLESHOOTING - Cont
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
3.
EXPOSURE DRIFTS OR DEVIATES FROM INITIAL PHOTOTUBE CALIBRATION.
Step 1.
Check for defective 2D21 thyratron tube.
(a)
If 2D21 is not defective, proceed to step 2.
(b)
Replace defective tube (paragraph 3-20.2).
Step 2.
Check for defective OB2 regulator tube(s).
Replace defective tube(s) (paragraph 3-20.2).
4.
FLASH CYCLE IS ERRATIC.
Step 1.
Check for defective 2D21 thyratron or OB2 regulator tube(s).
Replace defective tube(s) (paragraph 3-20.2).
Step 2.
Check for defective internal bulb or loose calibration wedge.
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