TM 11-5821-333-30
6-20. OPERATIONAL CHECK. Continued
ACTION
RESPONSE
Step 3. REFERENCE RT SELF-TEST
Set ref rt FUNCTION switch to Z-A then TEST.
Ref rt display reads:
"---- - -
for 3s
E
- for 2s
8 8 8 8 8 f o r 7 s
Good for 8s
If not, replace reference rt. If still bad, go to
troubleshooting schematic 1.
Step 4. REFERENCE RT FREQUENCY LOAD TEST
a. Set ref rt
a. No response.
FUNCTION: LD
b. Load the following frequencies into the pre-
b. Each frequency loads correctly,
sets shown.
If not, ref rt is bad.
PRESET
FREQUENCY (kHz)
1
35875
2
39975
3
47175
4
55000
5
55700
6
72000
CUE
87600
c. Set ref rt
FUNCTION: SQ ON
PRESET: MAN
d. Press .../TlME key on ref rt.
Step 5. REFERENCE RT RF OUTPUT TEST
a. Remove jumper WI from J10 and J11.
b. Connect DMM rf probe to J10 using setup
shown in figure 640. Set DMM to read dB, 50
ohm reference.
c. No response.
d. Ref rt display reads 00 .
If not, ref rt is bad.
a. No response.
b. No response.
6-166