Nokia NPC-1 Series Troubleshooting Instructions page 29

PAMS Technical Documentation
Power control loop
Basically, the power detection is done with the Power detector module and power con-
trol is done inside the SAFARI. Power detection is similar for both bands, except that
both bands have their own coupler.
Is PWRDET vs.
output power OK?
See chart below.
Y
Is DAC value vs.
PWRDET (mV) OK?
The detected voltages are illustrated in the following table and diagram:
Table 3: Typical detected voltages at power levels PL2...PL10
800A
Pout
PL dBm
2 25.5
3 21.5
4 17.5
5 13.5
6 9.5
7 5.5
8 -
9 -
§0 -
Note: DAC values may vary about +- 20%
Note: TXPWRDET is the difference between TX on burst and off burst.
Issue 1 10/01
Figure 13: Fault tree: Power control loop
Check VR2 and
N
RFTEMP .
Check C930, C931
and PWRDET
module.
N
Check UEM
(BaseBand)
TXPWRDET
dac mV
559 1475
388 1023
234 618
140 371
81 215
45 120
- -
- -
- -
ãNokia Corporation
Troubleshooting Instructions
Note !
See PWRDET vs. Output
power curve
800D
Pout TXPWRDET
dBm dac
27.3 671
23.3 465
19.3 281
15.3 168
11.3 98
7.3 54
3.3 31
-0.7 15
-4.7 5
NPC-1
Mv
1771
1228
742
445
258
144
82
40
14
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