Comtech EF Data CST-5000 - Manual (Page 115)

Maintenance CST-5000 C-Band Satellite Terminal
6–4 Rev. 9
Table 6-3. Fault Isolation (Continued)
Fault Possible Problem and Action
D/C LOCK Down converter lock fault.
Check for loose connections at P10, P11, and P4. Also, check all RF coaxial connectors
on the D/C synthesizer and D/C before replacing the modules. Once the problem has
been corrected, the transmitter must be turned back on.
Note: Not available in single synthesizer option.
IF LOCK IF Lock fault.
Check for loose connections at P9 and P4. Also, check all RF coaxial connectors on the
IF Local Oscillator module. If all connections are good, replace the IFLO module. Once
the problem has been corrected, the transmitter must be turned back on.
IF TUN IF Tuning fault.
Check for loose connections at P9 and P4. Also, check all RF coaxial connectors on the
IFLO module. If all connections are good, replace the IF local oscillator module. Once
the problem has been corrected, the transmitter must be turned back on.