TM 5-6675-319-14
Table 9-5. DIRECT/GENERAL SUPPORT TROUBLESHOOTING - Cont
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
—
4.
PMT METER READING DOES NOT VARY WHEN SENSITIVITY CONTROL IS ADJUSTED - Cont
( b ) I f c o n t i n u i t y i s n o t p r e s e n t , r e p l a c e m e r c u r y s w i t ch
(paragraph 9-20. 16).
Step 3.
Check continuity of PMT SENSITIVITY adjustment potentiometer.
( a ) I f c o n t i n u i t y e x i s t s , p r o c e e d t o s t e p 4.
(b) If continuity does not exist, replace PMT SENSITIVITY
adjustment potentiometer (paragraph 9-20.30) .
Step 4.
Check continuity of cable between -1
switch S109.
( a ) I f c o n t i n u i t y e x i s t s , p r o c e ed
( b ) I f c o n t i n u i t y d o e s n o t e x i s t,
Step 5.
Check output of -1 kV power supply.
kV power supply and mercury
to step 5.
r e p a i r c a b l e.
If output is not correct, replace -1 kV power supply (paragraph
9 - 2 0 . 1 4 ) .
5. EXPOSURE LAMP LIGHTS IN TEST AND MANUAL MODES ONLY. PRINTS ARE UNEXPOSED IN
MANUAL AND AUTOMATIC.
Step 1.
Check output of VDSF-2 CRT blanking circuit.
( a ) I f o u t p u t i s c o r r e c t , p r o c e e d t o s t e p 2 .
( b ) I f o ’ . t p u t i s i n c o r r e c t , r e p l a c e p r i n t e d c i r c u i t c a r d V D S F - 2
(paragraph 9 - 20 . 21).
9-114
