Motorola Sse 5000 6881094c12 A Manual

6881094C12-ANovember 11, 2004
Troubleshooting Charts: DC Supply Failure9-7
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 Ye sYe s
Ye sYe s
Ye s Ye s
Ye s
Ye s Ye s 3
Check
700-800: E6, C15,
C16, C17, and D2
VHF: E6, C6,
C8, and D2 Voltage
= V2?*Components
OK? Check R503,
D501, C509,
C510, and C508Replace
Problem
Component
Replace
700-800: U505
VHF: U1
Replace
Problem
Component Components
OK?
Check Voltage
at TP7
Check Voltage
at...

November 11, 20046881094C12-A
9-8Troubleshooting Charts: Display Failure
9.5 Display Failure—Page 1
MAEPF-27505-C
End Replace
LCD Display
Check integrity
of B700 2.775 V

6881094C12-ANovember 11, 2004
Troubleshooting Charts: Display Failure9-9
Display Failure—Page 2
MAEPF-27506-B
Ye s No
No Yes
Ye s
No
No No
No
Ye s
Ye sYe s 1
Problem
Resolved?
Problem
Resolved?
Problem
Resolved? Check
REG_SEL
at J301, pin 6 Check RESET
at J301, pin 6
Verify Signal
Path Integrity
and correct Verify Signal
Path Integrity
and correct Verify Signal
Path Integrity
and correct
Check CS at
J301, pin 3
3 V = V2?* V = V2?*
End
EndEnd
V = V2?*
* per Standard Bias Table
* per Standard Bias Table
*...

November 11, 20046881094C12-A
9-10Troubleshooting Charts: Display Failure
Display Failure—Page 3
MAEPF-27507-B
Low-
Level Pulses
Present? Check Active
Low Status on
both RESET
and CS Use an oscilloscope to check for
a low-level (0V) pulse occurrence
during power-on initialization period.
Use an oscilloscope to check for
either a low-level (0V) pulse or 
high-level (0-V2) occurrence during
power-on initialization period.No
Ye sNo Ye s 3
Signal
present
at appropriate
level?
Replace
Display Check J301,...

6881094C12-ANovember 11, 2004
Troubleshooting Charts: Volume Set Error 9-11
9.6 Volume Set Error
MAEPF-27401-B
No
No
No
Ye sYe s
Ye s Volume
Set  Error
Using  a  voltmeter,
measure  voltage  at
U507  pin  1,  when  volume
knob  is  all  the  way  on.
The  value  should  be  V2* Voltage
Functional? Replace
U501
Verify  connections
and  control  top/PTT
flex  connections
Volume
check  OK?
Refer
 to  
VOCON  RX
  Audio  flowchart Verify
 operation
of  volume  knob
using  Button  Test
flowchart
ReplaceU507...

November 11, 20046881094C12-A
9-12Troubleshooting Charts: Channel Select Error
9.7 Channel Select Error
MAEPF-27402-A
Replace
Housing
Assembly
Verify
 operation
of  channel  knob
using  Button  Test
flowchart
Signals
check  good  at  U1
on  the  controls
flex  assy.? Verify
 codeplug
programming  with
RSS.  If  codeplug
checks  OK,  then
replace  U1.
By
 studying  the
adjacent  table  against
the  channel  numbers
that  have  errors,  one
signal  may  be  determined
to  be  in  error.   Verify
logic...

6881094C12-ANovember 11, 2004
Troubleshooting Charts: Button Test9-13
9.8 Button Test
MAEPF-27399-A
EndButtons
correct?
Check signal
path integrity of
button in question Button Test
Place radio in Test Mode.
Press To p Side Button
(Monitor) so display reads
CH TEST. This places the
radio in button test mode.
Then, press the green
(display) button to verify 
codes display as shown
 in the Button Table at right
No Ye sThis chart relates to a failure in the button functions.
Basic Failure modes are as...

November 11, 20046881094C12-A
9-14Troubleshooting Charts: Top/Side Button Test
9.9 Top/Side Button Test
Use RSS
to enable
button
Replace
U501
Replace
Housing
Assembly
Verify connections
and control top/PTT
flex circuit and
repair as necessary Using RSS,
verify problem
button is enabled
for function
Levels
correct?Verify physical
operation of
buttons
Buttons
OK? Button
check OK?
Buttons
Enabled?Using a voltmeter, measure the voltage at
U504 pin 3 while depressing the following
buttons: 
- Display 
- To p...

6881094C12-ANovember 11, 2004
Troubleshooting Charts: VCO TX/RX Unlock 9-15
9.10 VCO TX/RX Unlock
MAEPF-27398-A
VCO TX/RX
unlock
11.0Vdc or
drifting?3V at TP5? Ye s
Ye s
Ye s
Ye s Ye sNo
No
No No
Ye s
Ye s Frequency
detected?
VCO locked? No
Ye sNo
5V at TP3?
Check
VOCON board
Check parts 
around BJT. If
OK, replace BJT Check control
voltage at
TP243Check parts
around U1. If
OK, replace U1
Aux. line
4 high for TX
or low for RX?
No FET
drain voltage
0V?Check parts
around FET. If
OK, replace FET
No BJT...

November 11, 20046881094C12-A
9-16Troubleshooting Charts: VOCON TX Audio
9.11 VOCON TX Audio—Page 1
MAEPF-27396-O
Inject a 200 mV
rms 1.0 kHz tone
to the test box
Audio In portRepair connections
and/or replace flex
and microphone Connections
OK?
Problem
with Mic path
components? No Problem
found.
End
Replace
appropriate
component
Is FM
deviation approx.
3.0 kHz?
Connect an
RLN4460A audio
test box (or equivalent)
to the radio side
connector Radio has no
Transmitter Deviation
(VOCON Evaluation)
Inspect...