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8-2-3 Tx Lock Failure
TR LOCK FAILURE
CW TEST MODE
CHECK TX POWER
AND TX FREQ
TX VCO RUNS
RF SIGNAL IS
FOUND AT C541
PLL CONTROL
DATAS COME TO U502
AT TP(V
0.2V AT CH-5)
8-9
HRF3
NO
YES
YES
FROM BMC
YES
CHECK V
tune
=2.0+/-
tune
YES
OK
YES
1. CHECK VCC OF U502
NO
2. CHECK WORKING OF TX VCO
CIRCUIT
NO
CHECK BIAS OF PIN21,22 OF
CHECK PATTERNS BETWEEN U502
NO
U11(PMB5720) OF LOGIC PART
1. CHECK 10.368MHz SIGNAL
2. CHECK VCC 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)
AND
Trouble Shooting
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Table of Contents
Troubleshooting
