TM 11-5821-333-30
6-20. OPERATIONAL CHECK. Continued
ACTION
RESPONSE
Step 19. RT-1477 FRONT PANEL TEST
Presets:
REMOVE THE FRONT PANEL FROM ANY KNOWN GOOD RT-1476, (USE THE REF RT IF ANOTHER RT IS NOT
AVAILABLE. )
INSTALL THE RT-1477 FRONT PANEL (INCLUDED IN MAINTENANCE GROUP) ON THE RT CHASSIS.
SET TEST ADAPTER–
SET REF RCU–
S5: OFF
FUNCTION : OFF
S6: OFF
PRESET: MAN
TAKE CTRL (S9) : RCU
IFM-RF PWR: OFF
SQ/CLK (S11) : OFF
MODE: SC
PTT (S13) : OFF
DC: OFF
CONNECT:
-TEST CABLE W2 FROM J1 OF RT-1 477 TO J1 OF TEST ADAPTER
-TEST CABLE W1 FROM J2 OF RT-1477 TO J2 OF TEST ADAPTER (REMOVE AND SET
ASIDE TEST CABLE W12)
a. Set
b. Set
test adapter DC switch to ON.
a.
ref rcu FUNCTION switch to TEST.
b.
c. Set ref rcu–
FUNCTION: SQ ON
IFM-RF PWR: LO
d. Set ref rcu IFM-RF PWR switch to H1.
e. If ref rcu is C-11466A, go to step 20c.
f. Connect ECCM fill device to FILL connector
of RT-1477 front panel.
c.
d.
e<
f.
No response,
Ref rcu display reads:
"------“ for 3s
“ E
-” for 2s
4’8888 8“ for 7s
“Good” for 8s
If not, replace RT-1477 front panel. If still bad,
go to troubleshooting schematic 18.
Test lamp 5 is lit.
Test lamp 10 is not lit.
If these lamps are not lit correctly, replace
RT-1477 front panel. If still bad, go to trouble-
shooting schematic 18.
Test lamp 5 is lit.
Test lamp 10 is lit.
If these lamps are not lit correctly, replace
RT-1477 front panel. If still bad, go to trouble-
shooting schematic 18.
No response.
No response.
6-178
