Fcl Circuitry Under The Vcxo Bot Can - Tait TM9100 Service Manual

If the VCXO output is correct, check the TCXO output as follows:
Task 36 —
TCXO Output
1.
2.
3.
4.
5.
Figure 9.17

FCL circuitry under the VCXO BOT can

CAN FOR
DIGITAL
BOARD
220 Frequency Synthesizer Fault Finding
Use the oscilloscope probe to check the TCXO output at the
test point (see Figure
TCXO output at TP504 test point: clipped sine wave of 1.0 ± 0.2 V
If the signal is correct, go to
page 221. If it is not, go to
The TCXO circuitry under the
can.
CDC TOP
Locate and repair the fault in the TCXO (XL500 and associated
components) (see Figure
Confirm the removal of the fault and go to
TP502" on page 221. If the repair failed, replace the main-board
assembly and go to "Final Tasks" on page
CDC BOT CAN
9.16). The signal is
SYN RX OSC
"Signals at TP501 and TP502" on
Step 3.
can is faulty. Remove the
CDC TOP
9.15).
"Signals at TP501 and
147.
© Tait Electronics Limited August 2005
504
TP
and should be:
pp
SYN BOT CAN
TM9100 Service Manual