Power Supply For Fcl; Fault-Diagnosis Stages - Tait TM9100 Service Manual

9.8

Power Supply for FCL

Indications of a fault in the FCL will have been revealed by the initial checks
Fault-Diagnosis
Stages
in
Loop" on page
input from the FCL to the PLL will imply that the FCL is suspect. Fault
diagnosis of the FCL is divided into four stages:
The checking of the power supply is given in this section in
The remaining three stages are covered in
to
measurement points for diagnosing faults in the FCL are summarized in
Figure
TM9100 Service Manual
© Tait Electronics Limited August 2005
"Initial Checks" on page 170
181. In the latter case a fault with the reference frequency
check power supply
check VCXO and TCXO outputs
check signals at TP501 and TP502
check VCXO and CODEC circuitry
"VCXO and CODEC Circuitry"
9.14.
and the PLL checks in "Phase-locked
"VCXO and TCXO Outputs"
respectively. The test and
Frequency Synthesizer Fault Finding
Task 34 below.
215