Components Between The Digital Board And The Frequency Synthesizer - Tait TM9100 Service Manual

Figure 9.6

Components between the digital board and the frequency synthesizer

FCL TOP CAN
If the supply for the charge pump is correct, check the reference frequency
Task 8 —
Reference
input from the FCL to the PLL.
Frequency
1.
2.
3.
4.
TM9100 Service Manual
© Tait Electronics Limited August 2005
Measure the reference frequency at pin 8 of IC503 (see
pin 8 of IC503: 13.012 ± 0.002 MHz and 1.1 ± 0.2 V
If the signal is correct, go to
Check IC503 (see Figure
Determine if the fault has been removed. If it has, go to
on page 147. If it has not, the FCL is suspect; go to
for FCL" on page 215.
pp
Task 9. If it is not, go to
9.2). Replace IC503 if it is suspect.
Frequency Synthesizer Fault Finding
VIAS FOR
MEASUREMENTS
Figure 9.2).
Step 3.
"Final Tasks"
"Power Supply
183