Rfpa Power Control-No Or Low Tx Rfpa_Cntrl (700-800 Mhz)-Part 2 Of 2; Rfpa Power Control—No Or Low Tx Rfpa_Cntrl (700–800 Mhz)—Part 1 Of 2 - Motorola ASTRO Digital XTL 5000 Detailed Service Manual

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 66 of this flowchart) for guidance in performing the actual troubleshooting
procedure.
START
Read General
Notes before
proceeding, Read
specific notes as
indicated
Remove Q0954.
Proper power
restored?
(Note 1)
No
Remove D0950.
Proper power
restored?
(Note 2)
No
U0956-3, pin 10
~ 1.5V?
Yes
No
TP0955 voltage
~ 1.5V?
A
Yes
Figure 5-51. RFPA Power Control—No or Low TX RFPA_CNTRL (700–800 MHz)—Part 1 of 2
6881096C74-B
Repair/replace
defective parts or
Yes
see
Controller
GPIO section
Yes
Repair/replace
defective parts
VCC3 present at
No
U0963, pin 5?
(Note 3)
Yes
Repair/replace
defective parts
Repair/replace
defective parts
A
Remove D0951.
Yes
Proper power
restored?
(Note 5)
No
VFORWARD buffer
Yes
functioning properly?
(Note 6)
No
Repair/replace
defective parts
No
VCC5 present at
U0963, pin 1?
Yes
Remove R0974.
VCC3 present at
U0963, pin 5?
(Note 4)
No
Repair/replace
defective parts
Go to
Controller
GPIO Section
Yes
U0959 functionally
properly?
(Note 7)
No
Repair/replace
defective parts or
see
Controller
GPIO section
See
No
Controller
VCC5 section
Yes
Repair/replace
defective parts
Repair/replace
U0963
MAEPF-27927-O
May 25, 2005
5-65