Nokia 5510 - Page 43

PAMS Technical Documentation RF Troubleshooting
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Measure TX
power on "ANT"
Power > 30.5 dBm
in 50 ohm.
Measure TX
power on "Pout".
Power ~ 8 dBm in
500 ohm
Measure TX
power on "Pin".
Power ~ -25 dBm
in 500 ohm
No
Measure TX
power unbal T504
Power ~ -30 dBm
in 500 ohm
With Osc check:
VTX = 2.7V +
discretes around
T504
Check POGO
pins, C593, L510
Yes
Measure TX
power on
GSM_Tx. Power ~
8 dBm in 500 ohm
With Osc on
RXTX switch
check: Vc1 = 0V,
Vc2 = 2.7V
Yes
Check L515
(Coupler)
Check RXTX
switch
Yes
Check Hagar +
Serial bus
With Osc on PA check:
Vpctrl GSM900. Vpctrl
~ 1.7Vpp (see figure ?)
Yes
Check PA N502
Yes
With osc on TX
buffer check:
TXBUF = 2.7V
No No
Yes
No
Measure TX
power "TX buffer
input"
No No No
Yes
Check V601,
V602 + discretes
around
Yes
No
Check Z503
Yes
No
With Osc check
TXC (see figure
below)
With Osc check
"Vpctrl" ~ "TXC"?
Yes
No
Check V503 +
discretes around
No
No