jotron TR-7750C - Page 79

Jotron AS| TR7750C: Operators Manual  ERROR CONDITIONS AND CORRECTIVE ACTIONS
Page 6-3
P/N: 84748 (pre_F)
6V
Failure on 6V
regualtor on mod
module
LO lock detect
Synthesizer is out
of lock
LO level
The LO level is
below 0dBm
Mod module
TX alarm
Action:
Replace -
TX unit (LRU)
Modulator module
(LRM)
Probable cause:
Defective
synthesizer circuits
/ VCO / TCXO
Action:
Replace -
TX unit (LRU)
Modulator module
(LRM)
Probable cause:
Defective
synthesizer circuits
/ VCO / TCXO
Action:
Replace -
TX unit (LRU)
Modulator module
(LRM)
Probable cause:
Defective 6V
regulator
modulator board
Figure 6.1-2, Transmitter Modulator module, errors and corrective actions