9-2
6880905Z99-O
June, 2000
Troubleshooting
GTX LTR/Privacy Plus 800 MHz Mobile Service Manual
Troubleshooting Charts
Start
Is K9.1 0V
Is DET_AUDIO
Check
Check RX_IN
<-
>-50dBm
Check
Check
Check
Check LO_INJ
<0dBm
>0dBm
Check
Check IF
<-35dBm
>-35dBm
Is <-38dBm
Is DC
Replace
Is <-48dBm,
Replace
RF input level is -47dBm.
Is <-35dBm
Check
Is <-20dBm
Check
Is <-22dBm
Check
All the levels indicated have
No
Yes
Yes
Yes
No
No
No
Replace
Yes
Yes
No
Yes
No
DC circuit.
logic circuit.
Rx/Tx switch.
synthesizer
controller
circuit.
Y5201.
Q5201.
Y5202.
U5211.
Q5301.
level.
level
on L5401.
present on
R5302.
Circuit.
present at
AC level
0.2Vrms,
1KHz?
End
Y5202-3?
Y5202-1?
45.1MHz, present
at U5211-5?
No
at Q742-C?
50dBm
a tolerance of 10%.
NOTE:
level.
Is
present at
RF_REG_5V
Q5230-E?
Yes
Yes
Yes
Y5201-3?
present on
prsent on
FL5204?
present across
No
No
B
Troubleshooting Flow Chart
for Receiver
R5302?