Troubleshooting Flow Chart For Receiver - Motorola M11URD6CB1_N Service Manual

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