Motorola Astro Xts5000 Detailed 6881094c31 E Manual

November 16, 20066881094C31-E
4-8Troubleshooting Procedures: Power-Up Self-Check Diagnostics and Repair (Not for Field Use)
Notes 

Chapter 5 Troubleshooting Charts
This section contains detailed troubleshooting flowcharts. These charts should be used as a guide in 
determining the problem areas. They are not a substitute for knowledge of circuit operation and 
astute troubleshooting techniques. It is advisable to refer to the related detailed circuit descriptions in 
the theory of operation sections prior to troubleshooting a radio.
5.1 List of Troubleshooting Charts
Most troubleshooting charts (see Table 5-1) end up by pointing to...

November 16, 20066881094C31-E
5-2Troubleshooting Charts: Main Troubleshooting Flowchart
5.2 Main Troubleshooting Flowchart
MAEPF-27403-A
Start
Is TX
Deviation
OK? Go to
TX RF
flowchart
Go to 
VOCON
RX Audio
flowchartReceive 
Audio?
Good
SINAD?
Buttons
Functional?
EndGo to either
Display Failure or
Power-Up Failure
flowchart
See Button
Test flowchartError
Messages on
RSS? Ye s
Ye s
Ye sYe s
Ye s
Ye s
Ye s
Ye s
Ye sNo
No
No
No
No
NoNo
No
No Good
power-up
Self-Test?Error
Message?Display
Model?
See Table...

6881094C31-ENovember 16, 2006
Troubleshooting Charts: Power-Up Failure5-3
5.3 Power-Up Failure—Page 1
MAEPF-27389-C
Radio
Power-Up
Failure
Remove
R528 (VOCON)
Replace U301
(Flipper) and
place R528 
back on boardFixed?
Place R528
back on board
Probe
32.768 kHz
Clock at R316
Signal
Present?
Is
VOCON Board
NNTN4563, NNTN4819,
or NNTN4717
kit? Signal may appear
for a very short period
of time (50 ms). Use
an oscilloscope with
trigger to capture signal. 
Verify integrity
of C308 and
C309
Remove
Shield
SH101...

November 16, 20066881094C31-E
5-4Troubleshooting Charts: Power-Up Failure
Power-Up Failure—Page 2
MAEPF-27390-A
Investigate
Clock Buffer
Components and
Isolate ProblemThis signal may
contain harmonics
and, therefore, may
not appear as a 
perfect sinewave.
Signal may
appear for a very
short period of
time (50ms). Use
an oscilloscope
with trigger to
capture signal.
Refer Board to
Service Depot for
Reflash, Patriot,
SRAM, and
FLASH AnalysisInvestigate
16.8 MHz
Reference
Oscillator Probe
16.8 MHz
Signal at...

6881094C31-ENovember 16, 2006
Troubleshooting Charts: Power-Up Failure5-5
Power-Up Failure (for kit NNTN5567)—Page 1
 
2
No
Components
OK?
Ye s
Check For
32.768 kHz
Signal on
R545Replace
Problem
Component
Signal
Present?NoReplace R513
And RetestNo
Signal
Present?
Ye s
Ye s
No
No
No Ye s
Ye sYe s Follow DC
Supply
Failure
FlowchartEnd
Check For
32.768 kHz
Signal on
R543Problem
Solved?
Signal
Present?Replace U512
End Problem
Solved?
Follow DC
Supply
Failure
Flowchart 

November 16, 20066881094C31-E
5-6Troubleshooting Charts: Power-Up Failure
Power-Up Failure (for kit NNTN5567)—Page 2
1
Probe
16.8 MHz
Signal at R459Signal may
appear for a very
short period of
time (50ms). Use
an oscilloscope
with trigger to
capture signal.Note: All components noted on this
chart are VOCON components.
Investigate
16.8 Mhz
Reference
Oscillator No
No Signal
greater than
600mV?
Ye s
Ye s
No
No Ye sYe s Check
16.8 MHz
Signal at
C450
Signal
greater than
600mV?The signal may
contain harmonics...

6881094C31-ENovember 16, 2006
Troubleshooting Charts: DC Supply Failure5-7
5.4 DC Supply Failure—Page 1
NOTE:Since the failure of a critical voltage supply might cause the radio to automatically power 
down, supply voltages should first be probed with a multimeter. If all the board voltages 
are absent, then the voltage test point should be retested using a rising-edge-triggered 
oscilloscope. If the voltage is still absent, then another voltage should be tested using the 
oscilloscope. If that voltage...

November 16, 20066881094C31-E
5-8Troubleshooting Charts: DC Supply Failure
DC Supply Failure—Page 2
MAEPF-27392-B
Check R763,
L703, C717, 
and CR700
Check Voltage
at R560Replace
Problem
Component
Voltage
= V2?*Replace
U501
(GCAP II) Check R502,
C506, L502,
and D503 Voltage
= 3.77V+/-5%?
Voltage
= 1.85V+/-5%?Components
OK?ReFLASH
HOST C
Code
Fixed?
End Components
OK?
Check Voltage
at R501Replace
Problem
Component Check Voltage
at B502
(VOCON)
No
Ye sYe s
Ye s
Ye s
Ye sYe s
NoNo
No No 1
2
32 No
* per...

6881094C31-ENovember 16, 2006
Troubleshooting Charts: DC Supply Failure5-9
DC Supply Failure—Page 3
MAEPF-27393-C
Voltage
= 5.0V+/-5%? Check Voltage
at pin 5 of
U505 (VOCON)
No No
No No
No No
No
No YesYes
YesYes
Yes Yes
Yes
Yes Yes 3
Check 700-800:
E6, C15, C16,
C17, and D2
VHF and UHF R2: 
E6, C6, C8,
and D2 Voltage
= V2?*Components
OK? Check R503,
D501, C509,
C510, and C508Replace
Problem
Component
Replace
700-800: U505
VHF and 
UHF R2: U1
Replace
Problem
Component Components
OK?
Check Voltage
at TP7...