Motorola SSETM 5000 - Manual (Page 124)

November 11, 2004 6881094C12-A
9-20 Troubleshooting Charts: RX RF
9.13 RX RF—Page 1
Frequency OK?
UHF: 73.35 MHz
Inject a standard FM test signal
into the antenna port. Use CPS to
ensure that attenuator feature is
disabled. Use a spectrum analyzer
and high-impedance RF probe to
measure the IF signal on side 2.
No
No
Yes
Yes
Poor RX
sensitivity or
no RX audio
Check
RXLO
Replace
bad part
Remove cable
assembly, measure
insertion loss
Visual
inspection
OK?
No
Yes
Bad antenna connector.
Replace chassis
(connector is not
serviceable)
Loss
< 0.2 db?
Replace
cable assembly
No
Yes
Inspect coaxial
antenna connector
and cable assembly
Measure RF
input level
at TP02
Measure RF levels at TP02
and TP13 ,
compute SW_FL loss
RF level
about
-47 dBm?
No
Yes
SW_FL
loss < 2 dB?
Check
SW_FL
Yes
No
IF
level about
-38 dBm?
1
2
3 kHz FM deviation,
1 kHz rate, -47 dBm
MAEPF-27470-B