Power Supply; Tcxo Circuitry Under The Cdc Top Can - Tait TM9100 Service Manual

If the FCL is suspect, first check that the 3V power supply is not the cause
Task 34 —

Power Supply

of the fault.
1.
2.
3.
Figure 9.15

TCXO circuitry under the CDC TOP can

IF TOP CAN
TM9100 Service Manual
© Tait Electronics Limited August 2005
If not already done, remove the main-board assembly from the chassis
and place the radio in CCTM.
Measure the supply +3 0
V
is adjacent to the
CDC TOP
via adjacent to CDC TOP can: 3.0 ± 0.3 V DC
If the voltage is correct, go to
page 218. If it is not, the 3V regulator IC603 is suspect; go to
of "Power Supply Fault Finding" on page
VIA FOR MEASURING 3 V DC SUPPLY
at the via shown in Figure
AN
can.
"VCXO and TCXO Outputs" on
158.
Frequency Synthesizer Fault Finding
9.15. The via
Task 3
217