Nokia RH-41 Series Troubleshooting Instructions page 32

RH-41
Troubleshooting Instructions
Power control loop
Basically, the power detection is done with the Power detector module and power con-
trol is done inside the Taco. Power detection is basically 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:
800A
Pout
PL dBm dac
2 24.8 712
3 21.6 512
4 18.5 340
5 14.5 239
6 10.5 180
7 6.5 141
8 - -
9 - -
§0 - -
Note: DAC values may vary about +- 20%
Note: TXPWRDET is the difference between TX on burst and off burst.
Page 32
Check VR2 and
RFTEMP. Check
N
C930, C931, and
PWRDET module.
Check UEM
N
(baseband)
Figure 14: Fault tree: Power control loop
800D
TXPWRDET Pout
mV dBm
1984 27.3
1437 23.3
961 19.3
686 15.3
510 11.3
415 7.3
- 3.3
- -0.7
- -4.7
Nokia Corporation
CCS Technical Documentation
TXPWRDET
dac Mv
779 2201
476 1312
284 759
171 462
98 271
56 151
30 84
14 46
5 16
Confidential
Note! See PWRDET vs
Output power curve
1900D
Pout TXPWRDET
dBm dac mV
27.3 702 1980
23.3 431 1198
19.3 262 730
15.3 158 445
11.3 88 253
7.3 50 148
3.3 26 79
-0.7 14 44
-4.7 6 20
Issue 2 09/2003