TM 11-5821-333-30
6-20. OPERATIONAL CHECK, Continued
ACTION
RESPONSE
Step 15. REFERENCE RCU TEST. Continued
u. Set ECCM fill device–
Function: ON
Select: T1 or T2
v. On ref rcu, press H-Ld.
w. Set ref rcu FUNCTION switch to LD.
x.
Set ECCM fill device select switch to any hop-
set.
y.
Press ref rcu LOAD (H-Ld) key.
z. On ref rcu, press STO (Sto/ENT).
aa. On ref rcu, press 1.
ab. Turn ECCM fill device off and disconnect
from ref rt.
ac. Set ref rcu—
FUNCTION: Z-A
MODE: SC
ad. Set DMM to measure resistance. Connect
DMM probes to J1-G(+) and TP24(-).
ae, Set ref rcu FUNCTION switch to LD.
af. Load these frequencies one after another
into PRESET 1 of the ref rcu:
31250
78950
46000
u. No response.
v.
Ref rcu display reads:
“LOAd” then “Hid t“
If not, ref rcu is bad.
w. No response.
x.
No response.
y,
Ref rcu display reads “ LOAd” and “ HFnnn”
(n = 0-9). If not, ref rcu is bad.
z. Ref rcu display reads “Sto “ .
If not, ref rcu is bad. —
aa. Ref rcu display reads “Sto 1 “.
If not, ref rcu is bad.
ab. No response.
ac. Ref rcu display reads ‘(Good”.
If not, ref rcu is bad.
ad. DMM reading is less than 5 ohms. If not, re-
place reference rcu. If still bad, go to trouble-
shooting schematic 11.
ae. No response.
af. Each frequency loads correctly. If not, ref rcu
is bad,
6-175
