TM 11-6625-3053-14
ITEM
MALFUNCTION
CHECKS/CORRECTIVE ACTION
5
4. Check beam current per Alinement step 4.
(cont'd)
a) If the beam current measures between 18 and 21 mA, go to
check 5 below.
b) If beam current higher or lower, aline beam cur- rent per
alinement step 4. If beam current cannot be alined, go to T/S
item 10.
c) If no beam current, check klystron tube per T/S item 11.
5. Check Power Set Probe output per Alinement step 6.
a) If -7 dBm obtained reconnect P2 To J2 and go to check 6 below.
b) If you measure little or no power out at P2, or you cannot obtain
the -7 dBm output, deenergize sig gen and remove the Power Set
between center conductor of P2 and the outer shell of P2.
Resistance should measure between 45 and 55 ohms.
if resistance is not within these limits, replace the POWER SET
probe assy.
Recheck for the -7 dBm output at P2 per aline- ment step 6.
6. Check the Leveling Attenuator Assembly.
a) Deenergize sig gen POWER. Disconnect P1 from J1.
b) Attach an adapter SMA male to type N female to J1. Connect a
thermistor mount to the type N connector and an ext power meter
to the thermistor mount.
c) Set sig gen to initial settings of para 2-4 and energize sig gen and
ext power meter. Wait 2 mins and set MODULATION switch to
CW.
d) Measure rf output at J1 with the external power meter.
This time, you should read -9 dBm with the POWER SET control
in the same position in which you 'obtained the -7 dBm as in check
5 above.
6-54