Motorola ASTRO XTS 5000 Detailed Service Manual page 88

6-20
6.21 RX RF—Page 1
Poor RX
sensitivity or
no RX audio
Inject a standard FM test
signal into the antenna port.
Use a spectrum analyzer and
high-impedance RF probe to
measure the IF signal at
TP12 on side 2
Frequency =
109.65 MHz?
Yes
IF
level about
-38 dBm?
No
Measure RF
input level
at TP02
RF level
about
-47 dBm?
Yes
Measure RF levels
at TP02 and TP13,
compute SW_FL loss
SW_FL
loss < 2 dB?
Yes
2
April 15, 2002
3 kHz FM deviation,
1 kHz rate, -47 dBm
No Check
RXLO
Yes
1
Inspect coaxial
No
antenna connector
and cable assembly
Check
No
SW_FL
Troubleshooting Charts: RX RF—Page 1
Visual
No
inspection
OK?
Yes
Remove cable
assembly, measure
insertion loss
No
Loss
< 0.2 db?
Yes
Bad antenna connector.
Replace chassis
(connector is not
serviceable)
Replace
bad part
Replace
cable assembly
MAEPF-27470-O
68P81094C31-O