Rfpa Power Control-No Vgbias (380-470 Mhz And 450-520 Mhz); Figure 5-33. Rfpa Power Control-No Vgbias (380-470 Mhz And 450-520 Mhz) - Motorola ASTRO Digital XTL 5000 Detailed Service Manual

Troubleshooting Charts: Flowcharts
5.6.31 RFPA Power Control—No VGBIAS (380–470 MHz and 450–520 MHz)
START
Read General
Notes before
proceeding. Read
specific notes as
indicated
No/low
Q5503 pin 7
VGBIAS1?
No
No/low
Q5503 pin 6
VGBIAS2?
No
Figure 5-33. RFPA Power Control—No VGBIAS (380–470 MHz and 450–520 MHz)
6881096C74-B
Remove U0960.
Yes
TP0937 voltage
2.6-2.8 V?
No
Remove U0960.
Yes
TP0939 voltage
2.6-2.8 V?
No
Remove U0960.
TP0941 voltage
2.0-2.2 V?
No
Yes
Repair/replace
U0960
Yes
Yes
5-45
Repair/replace
U0959. If problem
still not fixed, see
IC communication
in CONTROLLER
section.
May 25, 2005