Alcatel SP-R5200 Operations & Installation Manual page 91

8-4-3 Tx Lock Failure
TX LOCK FAILURE
CW TEST MODE
CHECK TX POWER
AND TX FREQ
TX VCO RUNS
RF SIGNAL IS
FOUND AT C541
PLL CONTROL
DATS COME TO U502
FROM BMC
CHECK V
AT TP (V
0.2V AT CH5)
Trouble Shooting
BRF3
NO
YES
YES
YES
tune
=2.0+/-
tune
OK
YES
1. CHECK VCC OF U503
NO
3. CHECK WORKING OF TX VCO
CIRCUIT
NO CHECK BIAS OF PIN 21, 22 OF
CHECK PATTERNS BETWEEN
NO
U502 AND U5 (PMB5725)OF LOGIC
1. CHECK 10.368MHz SIGNAL
2. CHECK VCO OF U502 (PMB4220)
NO
3. CHECK PIN8(V=0.7±0.2V) OF
U502 (PMB4220)
4. CHECK PIN9 (V=1.4±0.2V) OF
U502 (PMB4220)
OK
U502 (PMB4220)
PART
8-26