TM 5-6675-318-14
Table 4-24. DIRECT/GENERAL SUPPORT TROUBLESHOOTING - Cont
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
20. 2D FIX BUT NOT 3D FIX.
Set up the equipment to track a satellite in accordance with paragraphs 4-6.2
and 4-6.3.
While the satellite is being tracked, enter code 50 to display
r e c e i v e r s t a t u s.
(a) If receiver status indicates a constant 1 or 4, repl ace dual
s a t e l l i t e r e c e i v e r b o a r d ( p a r a g r a p h 4 - 2 0 . 4 ) .
(b) If receiver status varies between 1, 4 and A, check reference
oscillator frequency in accordance with malfunction 19.
21. VOLTMETER DOES NOT INDICATE INTERNAL BATTERY VOLTAGE.
Step 1.
Check voltage at pins 20 and 21 on connector J13 with external power
a p p l i e d.
Voltmeter should indicate 14 V.
(a) If 14 V was indicated, proceed to step 2.
(b) If 14 V was not indicated, replace the power supply board
(paragraph 4 - 20 . 2).
Step 2.
Disconnect external power supply and check internal fuse.
(a) If fuse was not defective, proceed to step 3 .
( b ) R e p l a c e d e f e c t i v e i n t e r n a l f u s e .
Step 3.
Check internal battery voltage.
Voltmeter should read at least
10.5 V.
4-201
