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Motorola Astro Xts5000 Detailed 6881094c31 E Manual

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Page 121

November 16, 20066881094C31-E
5-30Troubleshooting Charts: VOCON RX Audio (for kit NNTN5567)
VOCON RX Audio—Page 2
MAEPF-27395-O
Make sure that you look at
all solder contacts. Check
resistors and capacitors
associated with this check. If
all look fine, then replace U502.
Make sure that you look at
all solder contacts. Check
resistors and capacitors
associated with this check. If
all look fine, then replace U503.
Signal
Present? Check Preamp
Output Signal
at C530
No
No
No
No
No Ye s
Ye s
Ye sYe s Ye s 1...

Page 122

6881094C31-ENovember 16, 2006
Troubleshooting Charts: RX RF5-31
5.14 RX RF—Page 1
Frequency OK?
VHF: 44.85 MHz
UHF R1/R2: 73.35 MHz
700-800: 109.65 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 
at TP12 (700-800) or
 TP15 (VHF) or TP455 (UHF R2) on side 2
No
No
Yes Yes Poor RX
sensitivity or
no RX audio
Check
RXLO
Replace
bad part
Remove cable
assembly,...

Page 123

November 16, 20066881094C31-E
5-32Troubleshooting Charts: RX RF
RX RF—Page 2
Q501-c
= 5.0 Vdc?No
No
No
YesYes Yes
Repair
Defects Visual
examination 
OK?Check Voltage
Regulator U1
Q501-e
= 3.7 Vdc?No
YesReplace
Q501
Replace
Q502 Remove SH501 (UHF R1
& 700-800) or SH502  
  (VHF and UHF R2), 
inspect 2nd LO VCO Signal
Present? Measure 2nd LO at TP501 
(UHF R1 & 700-800) or 
   TP18 (VHF and UHF Range 2)
on PCB side 2 
No
No
Yes Yes
LO Freq.
OK?
VHF: 42.6 MHz
UHFs: 71.1 MHz
700-800:
107.4 MHz
Measure
RXCK,...

Page 124

6881094C31-ENovember 16, 2006
Troubleshooting Charts: RX RF5-33
RX RF—Page 3
TP502
= 0 Vdc?No
No
YesYes
Repair
defects Measure RF levels at first preselector
filter and compute filter loss.
VHF & UHF2: TP401, TP9
UHF: TP13, U401-3
700-800: TP13, D401-3
No
Yes Loss < 3 db?
Measure RF levels at LNA
and compute LNA gain.
VHF & UHF2: TP9, TP12
UHF: U401-1, TP402
700-800: D401-3, TP402
Measure RF levels at second preselector
filter and compute filter loss.
VHF & UHF2: TP12, TP451
UHF: TP402, TP403
700-800:...

Page 125

November 16, 20066881094C31-E
5-34Troubleshooting Charts: RX RF
RX RF—Page 4
Ye s Fbit
< 1.2 MHz?Measure
tuning voltage
(Vt) at R512
No
No
No Ye s Ye s
Vt= 3 Vdc?
Repair
defects
Replace
Varactor D501Replace
Abacus
U500Repair
defects
Visual
examination
OK?
4
Visual
examination
OK? Remove SH501,
inspect
components
No
Ye s5
5No
Ye s
Remove SH501,
inspect clock
oscillator circuit at
U500-19, 20Vt = 0 Vdc?
5 Clock
synthesizer
MAEPF-27473-O 

Page 126

6881094C31-ENovember 16, 2006
Troubleshooting Charts: RX RF5-35
RX RF—Page 5
dac1 = dac2? Measure prselector filter
tuning voltage dac1 and dac2.
VHF & UHF2: None, TP29
UHF R1: TP401, TP405
700-800: TP401, TP405
No
Yes Is unit
VHF or UHF2?
No Yes
Replace IF filter.
VHF & UHF2: FL451
UHF R1: FL490
700-800: FL403Repair
defects
68
Visual
inspection
OK? Remove IF filter shield. Check IF
filter and LC matching networks.
VHF & UHF2: SH451
UHF R1: SH403
700-800: SH403
No
Yes
VHF/UHF: Check discrete
preselector...

Page 127

November 16, 20066881094C31-E
5-36Troubleshooting Charts: TX RF (VHF and UHF Range 2)
5.15 TX RF (VHF and UHF Range 2)—Page 1
TX
power OK? Place XCVR and VOCON
into the analysis fixture.
Key up. Measure RF
power at antenna port
Ye s
No
Ye sNo No or low
TX power
Check
FGU Frequency
OK?
No
Ye sCheck
FGU Level
about
-3 dBm?Check coaxial
connector and
cable assembly
Measure RF level
at Q107 pin 2 Use a spectrum analyzer
and high-impedance RF
probe. Measure TXRF
at C016
Level about
+15 dBm?NoNo
Ye s
Ye sLevel...

Page 128

6881094C31-ENovember 16, 2006
Troubleshooting Charts: TX RF (VHF and UHF Range 2) 5-37
TX RF (VHF and UHF Range 2)—Page 2
MAEPF-27420-C
RAWB+
about
7.2 Vdc? Measure
RAWB+
at Q107-drain
No
No
No
YesYes Yes
Check
continuity V.gate
about 2 to
3 Vdc?Check
continuity
DC bias is OK,
control is OK,
RFIN is OK,
PA has low gain
Replace
Q107NoYesMeasure RF
level at
pin 6 of Q107 Is unit
VHF or 
UHF R2?
No
YesRemove SH10
1and check for
parts off pad Level
about
+35 dBm?
Replace U102. For VHF and
UHF Range 2, check...

Page 129

November 16, 20066881094C31-E
5-38Troubleshooting Charts: TX RF (VHF and UHF Range 2)
TX RF (VHF and UHF Range 2)—Page 3
INT > 5 Vdc? Vgate at TP111
is low (< 4 Vdc)
Measure INT 
at TP104
Yes
No
No
YesYesNoReplace
Q108
INT is low.
Measure VLIM
at TP119
PCIC is
programmed.
Measure TEMP
at R124Bad PCIC
Replace U104 VLIM
about 2 to
3 Vdc?
No
Yes Measure
RFIN at
TP101TEMP
< 1.0 Vdc at
25C?
RFIN is low, INT
is low, bad PCIC,
replace U104TP101
< 0.5 Vdc?Low output power,
RFIN is high, check
RF detectors and
op...

Page 130

6881094C31-ENovember 16, 2006
Troubleshooting Charts: TX RF (UHF R1/700-800 MHz) 5-39
5.16 TX RF (UHF R1/700-800 MHz)—Page 1
TX
power OK? Place XCVR and VOCON
into the analysis fixture.
Key up. Measure RF
power at antenna port
Ye s
NoNo
Ye s
Ye sNo No or low
TX power
Check
FGU Frequency
OK?
No
Ye sCheck
FGU Level
about
-3 dBm?Check coaxial
connector and
cable assembly
Measure RF level
at driver amp
outlet, C107. Use a spectrum analyzer
and high-impedance RF
probe. Measure TXRF
at TP11
RF level OK?...
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