Motorola ASTRO XTS 5000 - Page 103

November 16, 2006 6881094C31-E
5-12 Troubleshooting Charts: DC Supply Failure
DC Supply Failure (for kit NNTN5567) —Page 3
MAEPF-27393-C
Voltage
= 5.0V+/-5%?
Check Voltage
at pin 5 of
U505 (VOCON)
No No
NoNo
No No
No
No
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
3
Check E6,
C6, C8, and D2
Voltage
= V2?*
Components
OK?
Check R503,
D501, C509,
C510, and C508
Replace
Problem
Component
Replace U1
on RF Boar d
Replace
Problem
Component
Components
OK?
Check Voltage
at TP7
Replace
U2
Check Voltage
at TP5
Check
700-800: D1, E5,
C12, C13, and C14
VHF: E5, C3, C4,
C5, and D1
Check Voltage
at TP3
Replace
U3
End
Replace
U1
Voltage
= 5.0V+/-5%?
Replace
Problem
Component
Voltage
= V2?*
Components
OK?
Replace
Problem
Component
Check
E7, C9, C10,
C11, and D13
Components
OK?
* per Standard Bias Table
* per Standard Bias Table