
June 15, 2005
6815854H01-A
5-62
Troubleshooting Charts:
Flowcharts
5.6.51 RFPA Power Control—No or Low TX RFPA_CNTRL (700–800 MHz)—Part 1 of 2
For each flowchart step in which reference is made to a note, be sure to refer to that specific note
(located on page 63 of this flowchart) for guidance in performing the actual troubleshooting
procedure.
Figure 5-49. RFPA Power Control—No or Low TX RFPA_CNTRL (700–800 MHz)—Part 1 of 2
Read General
Notes before
proceeding, Read
specific notes as
indicated
START
Remove Q0954.
Proper power
restored?
(Note 1)
Remove D0950.
Proper power
restored?
(Note 2)
Yes
No
U0956-3, pin 10
~ 1.5V?
No
Yes
Repair/replace
defective parts or
see
Controller
GPIO section
Repair/replace
defective parts
No
VCC3 present at
U0963, pin 5?
(Note 3)
VCC5 present at
U0963, pin 1?
No
See
Controller
VCC5 section
Yes
Remove R0974.
VCC3 present at
U0963, pin 5?
(Note 4)
Yes
Repair/replace
defective parts
Repair/replace
U0963
No
No
Repair/replace
defective parts
Yes
Yes
A
TP0955 voltage
~ 1.5V?
Repair/replace
defective parts
Yes
A
Remove D0951.
Proper power
restored?
(Note 5)
Repair/replace
defective parts
Yes
No
VFORWARD buffer
functioning properly?
(Note 6)
U0959 functionally
properly?
(Note 7)
No
Repair/replace
defective parts
Yes
Repair/replace
defective parts or
see
Controller
GPIO section
No
MAEPF-27927-O
Go to
Controller
GPIO Section
No
Yes
Summary of Contents for XTL 1500
Page 1: ......
Page 5: ...iv June 15 2005 6815854H01 A This page is intentionally left blank ...
Page 19: ...xviii List of Figures June 15 2005 6815854H01 A This page is intentionally left blank ...
Page 25: ...June 15 2005 6815854H01 A xxiv CommercialWarranty Notes ...
Page 35: ...June 15 2005 6815854H01 A xxxiv Model Numbering Charts and Specifications Notes ...
Page 49: ...June 15 2005 6815854H01 A 2 12 Product Overview Controller Section Notes ...
Page 161: ...June 15 2005 6815854H01 A 4 36 Troubleshooting Procedures Power Amplifier Procedures Notes ...
Page 225: ...June 15 2005 6815854H01 A 5 64 Troubleshooting Charts Flowcharts Notes ...
Page 429: ...8 2 Flex Cable Pin Out Lists Flex Cables June 15 2005 6815854H01 A Notes ...
Page 441: ...June 15 2005 6815854H01 A Glossary 10 Notes ...
Page 451: ...Index x June 15 2005 6815854H01 A This page is intentionally left blank ...