TM 11-6625-3053-14
ITEM
MALFUNCTION
CHECKS/CORRECTIVE ACTION
5. RK5837 Klystron tube check.
a) Remove instrument dust cover (para 6-20).
b) Remove klystron cover and socket by following klystron tube
removal procedure step c). Do not remove the tube (para 6-30).
c) Allow the tube to cool for 30 minutes in this state.
d) Using the digital multimeter set to 10 ohm range, measure the
resistance between pins 2 and 4 of the tube.
Resistance should be between 1 and 2 ohms in the cold state.
If the filament is open, or does not measure between 1 and 2
ohms in cold state, replace klystron RK5837 (para 6-26).
10
Filament voltage faulty, cannot be alined.
1. Check AR1.
a) Remove instrument dust cover if on (para 6-20).
b) Remove high voltage cover if on (para 6-22).
c) Deenergize sig gen.
d) Set sig gen controls as in para 2-4.
e) Set multimeter to 10 VDC range.
f)
Energize multimeter and sig gen.
g) Measure the voltage between test pin 11 of the card and pin 1 of
AR1 on A2A2 card assy.
Voltage should be greater than 9 VDC.
If correct voltage is obtained, replace A2A2AR1.
If incorrect voltage is obtained, go to check 2 below.
2. Check R5.
a) Measure voltage between test pin 11 and the positive terminal of
C1 or C2 on the A2A2 card assy.
Voltage should be between 9 V and 11 VDC.
If correct voltage is obtained, replace A2A2R5.
If incorrect voltage is obtained, go to check 3 below.
3. Check filament input rectifier and filter.
a) Set multimeter to 50 VAC range.
6-61
