Motorola Astro Digital Mobile Radio Xtl5000 Detailled 6881096c74 B Manual

							6881096C74-BMay 25, 2005
Troubleshooting Charts: Troubleshooting Tables 5-11
Table 5-4.  XTL 5000 Receiver Troubleshooting Table (VHF Band)
SymptomCheck SectionTroubleshooting ProcedureComponent
Poor Sensitivity Front-end • Check 2.85 V on pin 4 and 0 V 
on pin 5 of U3250• U3250.
• Check transistors Q3250, 
Q3252 VCE levels. Levels 
should be
~ 5 V• Q3250, Q3252 (only Q3252 in 
STD mode).
• Using a RF probe, check for 20 
dBm on TP6771• FGU section.
• Verify that all Front-end 
components are well soldered• Visual inspection of soldering.
Back-end • Check for VCE level of 8 V at 
IF amplifier• Q3401.
• Verify that ABACUS is well 
soldered• Visual inspection of U3000 
leads soldering.
Check ABACUS for:
• Reference clock 16.8 MHz
• Synthesizer frequency 
107.4 MHz or 111.9 MHz• R3822.
• C3846.
Poor Reception Back-end Check ABACUS DC voltages:
• 2.7-3 V on pins 1, 2, 6, 9, 14, 
17, 40
• 5 V at on 39• U3000.
• Check Second Local Oscillator 
for voltage of 0.5-4.7 V • U3000 pin 38.
• Check second IF for 2.25 MHz • C3047. 
						

							May 25, 20056881096C74-B
5-12Troubleshooting Charts: Troubleshooting Test Points
5.4 Troubleshooting Test Points
The following figures show the location of the main board test points for measuring voltages and 
viewing waveforms.
Figure 5-1.  Main Board Test Points—Top Side (for Mid Power)
Figure 5-2.  Main Board Test Points—Bottom Side (for Mid Power)
MAEPF-27802-O
ID7
ID6 ID5 ID3ID4
ID2ID1 ID0
MAEPF-27801-O 
						

							6881096C74-BMay 25, 2005
Troubleshooting Charts: Board ID Jumper Configuration 5-13
Figure 5-3.  Main Board Test Points—Top Side (for High Power)
Figure 5-4.  Main Board Test Points—Bottom Side (for High Power)
5.5 Board ID Jumper Configuration
The following jumper table (Table 5-5 on page 5-14) is provided for troubleshooting and determining 
what board revision you have. This can be helpful in the event a jumper was placed incorrectly or 
was removed during a repair and the radio is not functioning correctly.
This table provides two types of information:
• RF band of the radio
• Overall revision of the main board and controller section
TP0400 TP0401
TP0402 TP0403
TP0407
TP0408TP0409
TP0410
TP0411
TP0412TP0413
TP0414
TP0415
TP0950 TP0500
TP0420 TP0200TP0419
TP0418TP0206 TP0204
TP0203TP0205 
						

							May 25, 20056881096C74-B
5-14Troubleshooting Charts: Flowcharts
The table indicates what the logic levels are, as well as how they correlate to the placement or 
removal of a jumper to accomplish the logic level. This is because some of the board ID resistors are 
on Pull-Up I/O pins and some are on Pull-Down I/O pins. Therefore, the placement or removal of a 
resistor for a Pull-Up I/O is the opposite of what must be done for the placement or removal of a 
resistor for a Pull-Down I/O.
Refer to the troubleshooting testpoints chapter for a general idea of where the board ID pins are 
located. Refer to the board layout for the exact location with respect to all nearby components before 
attempting to place or remove any jumpers.
5.6 Flowcharts
This section contains the troubleshooting flowcharts that can help you isolate a problem in your 
radio.Table 5-5.  Board ID Jumper Configuration
Board ID2
R0103
Pull-UpBoard ID1
R0102
Pull-UpBoard ID0
R0101
Pull-Up
Band
0 = NP 0 = NP 0 = NP  700 / 800_35W
0 = NP 0 = NP 1 = Place  VHF_50W
0 = NP 1 = Place 0 = NP  UHF_40W
0 = NP 1 = Place 1 = Place  UHF_R2_45W
1 = Place 0 = NP 0 = NP  UHF_R1_100W
1 = Place 0 = NP 1 = Place  VHF_R1_100W
Board 
ID7
R0125
Pull- 
DownBoard ID6
R0110
Pull- 
DownBoard ID5
R 0 111
Pull- 
DownBoard ID4
R0123
Pull- 
DownBoard ID3
R0104
Pull-UpCon-
troller700-800 
MHzVHF1
50WUHF1
40WUHF2
45W
0 = Place 0 = Place 0 = Place 0 = Place 0 = Place  Reserved
0 = Place 0 = Place 0 = Place 0 = Place 1 = NP  Reserved
0 = Place 0 = Place 0 = Place 1 = NP 0 = Place  Reserved REV0/
REVA
0 = Place 0 = Place 0 = Place 1 = NP 1 = NP  Reserved
0 = Place 0 = Place 1 = NP 0 = Place 0 = Place  Reserved Reserved Reserved Reserved Reserved
0 = Place 0 = Place 1 = NP 0 = Place 1 = NP  REV0 REV0 Reserved Reserved Reserved
0 = Place 0 = Place 1 = NP 1 = NP 0 = Place  REVA NA Reserved Reserved Reserved
0 = Place 0 = Place 1 = NP 1 = NP 1 = NP  REVA NA NA REV0
0 = Place 1 = NP 0 = Place 0 = Place 0 = Place  REVB REVA REV0 REVA
Note: NP = Not Placed 
						

							6881096C74-BMay 25, 2005
Troubleshooting Charts: Flowcharts5-15
5.6.1 Poor RX Sensitivity or No RX Audio (136–174 MHz)—Part 1 of 2
Figure 5-5.  Poor RX Sensitivity or No RX Audio (136–174 MHz)—Part 1 of 2

	




 
  
  
!#!$%%
&
  () * 
+
,+ -+./
 
  
  
!	#!#
!$%%
&
0+ !
 -,+
 %(1/ 
23 !
 -,+
%(1/
& 3
+*+  
+/- /(
&
0+ 	  


 
45 
6
3 7 
	
&
0+ 
 !6
  8
* 
6
5 
2 6
5  0+ 	  

2
 
45 
(   
+ /-
/(
6
  8 * 6
5 
3 7 
	
&
,+ -+./5 
  8 *  6 
						

							May 25, 20056881096C74-B
5-16Troubleshooting Charts: Flowcharts
5.6.2 Poor RX Sensitivity or No RX Audio (136–174 MHz)—Part 2 of 2
Figure 5-6.  Poor RX Sensitivity or No RX Audio (136–174 MHz)—Part 2 of 2

	



 


 





 
 !#
$%&()*
+,  -
 ( 
-) 
 .
/ 0  1
-
2- 	&()
$3*  
--#4 5-6
 !# 
7 / 
.8 # # -
5 -) 
$(# )(*
5-6  !#
 	
$)8# + +* / .  #9)
 
 !#
$%()*
$(# )(*
5-6 
- / .
 - &:
;&&: ;&4
5-6  <
-)  
						

							6881096C74-BMay 25, 2005
Troubleshooting Charts: Flowcharts5-17
5.6.3 RX IF—Poor SINAD or No Audio (136–174 MHz)
Figure 5-7.  RX IF—Poor SINAD or No Audio (136–174 MHz)

	


 	
 

  	
 
! #$%
&#  (
) !*
  +
  , 
 ( -
!.   
 /	  ( -
!.   
 /
)& 
0 (!.
& 1 #!.% &
)!  #
 
! 2324#$
 !  ( )
!*   +
, 

 .
   &
564	
  	
+
, 

 .
   &
	
  	
+
,  )& 
0 (!.
& 1 #!.% &
)! $7 # ( 8/
$!  .   
 !
	
)* 
	 -* 0!!.
%*
-* 9  #
%(!. 17 &
%!!. %*
#  #!. #& :;# %#<
:;# %#< 
						

							May 25, 20056881096C74-B
5-18Troubleshooting Charts: Flowcharts
5.6.4 RX Back-End—Poor SINAD or No Audio (136–174 MHz)—Part 1 of 3
Figure 5-8.  RX Back-End—Poor SINAD or No Audio (136–174 MHz)—Part 1 of 3

	


 
  


  
  !#$%
%
%
%% %
& 
& & 
&  & 
(!
!$
(
 ) *+,-
 .+			
/0$

(
 ) +,-
 .+			 
1! 2$ # 0! 3
 /+	4  
5 
60# 
17+			2 ! ) 608 
 0 
#6!(
)50
# 
60#
	+
 9( 
! 497:
4
! /3;7:
++

 
 	+
$
%
& 
&  $
%
+ %
 ? 	8>
=!0 #$$!0 6!( 0A!!
! ,  0 .+			
 !0=
& 

#= !0
 0!
3 
/
& % 
#
BA!!
;$8 
 !0=
% 6A
)#!
97:
?
@ 6 4 @
6 .4  6 
C/ 5
1A  )( DD4
#6!(
5)A2$
& 
8 
 !0=/08 
(  (#
.+		 ) !A !4
8 ) 6  A
 ) ,
 ! .+		4
0 ) !0= 
						

							6881096C74-BMay 25, 2005
Troubleshooting Charts: Flowcharts5-19
5.6.5 RX Back-End—Poor SINAD or No Audio (136–174 MHz)—Part 2 of 3
Figure 5-9.  RX Back-End—Poor SINAD or No Audio (136–174 MHz)—Part 2 of 3
 


  
	
 


		
 
 
 
	
 
	  ! #
$ %

 	 
   $
  


	

&	
  $
 ( 	
	 	
	
  
 
)
*+,-.
./0,- 
						

							May 25, 20056881096C74-B
5-20Troubleshooting Charts: Flowcharts
5.6.6 RX Back-End—Poor SINAD or No Audio (136–174 MHz)—Part 3 of 3
Figure 5-10.  RX Back-End—Poor SINAD or No Audio (136–174 MHz)—Part 3 of 3







	
 	

 

  

   


 !


  

	
 	

 
  	# 
#$%$
 
	

	 

&$( (
() 
(%	

(%(#% 
 
* *(
	$*+
 ,%%$
 (
,
$$
 
 %#	
%$(%
$

	% *(
	$*+
 	(
#( (
,
$$


-
.,

#$*
&$( 
* 
$ 
	$* #
%$
 (%(#%/0


) 
 ,%%$
 

,%	(* (
,
$$
 
 
 	
 !

	% *(
	$*+
 	(
#( (
,
$$

	(

 12-345536!