Alcatel SP-R5200 Operations & Installation Manual page 90

8-4-2 Rx Lock Failure
RF LOCK FAILURE
CW TEST MODE
OS CILLATES
(FREE RUN)
RF SIGNAL IS
FOUND AT C541
PLL CONTROL
DATAS COME TO U502
FROM BMC
CHECK V
AT TP (V
0.2V AT CH5
8-25
BRF2
RX VCO
YES
YES
YES
tune
=2.0+/-
tune
YES
OK
2. CHECK VCC OF U502
NO
3. CHECK WORKING OF RX OSC
CIRCUTT
CHECK BIAS OF PIN 21, 22 OF
NO
CHECK PATTERNS BETWEEN
NO
U502 AND U5 (PMB5725 OF LOGIC
1. CHECK 10.368 MHz SIGNAL
2. CHECK VCC OF U502 (PMB4220)
NO
3. CHECK PIN7(V=0.7±0.2V) OF
U502 (PMB4220)
4. CHECK PIN9 (V=1.4±0.2V) OF
U502 (PMB4220)
U502 (PMB4220)
PART)
Trouble Shooting