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3.3.1.3 PLL Operation is Abnormal
The procedure for resolving the problem caused by Phase Locking Loop(PLL) operation is
as follows:
If PLL fails, a call can be connected but there is noise while calling.
Is DUTY of FOI signal steady?
No
Yes
Is REFERENCE
clock selection MMC selected?
No
Yes
Is the REFERENCE
clock normal?
No
Yes
Is 2 kHz norma?
No
Yes
Start
Check if the corresponding channel
signal of highway TX is generated.
Set the REFERENCE clock.
Check the REFERENCE clock of
TEPRI board, main board and
MP10/11 board.
- If REFERENCE clock sometimes
shakes, TEPRI line is abnormal.
- If REFERENCE clock does not
shake, repair the VCO circuit.
MP10/11: Composed of U23, U24,
and Y1.
- MP10/11: Check PINT2 of U22.
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