Nokia 3155 Rf Description And Troubleshooting page 49

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for the presence of the 19.2MHz signal.
2
8
Table 14 includes the descriptions and values for VCTCXO test points from
Test
Description
Point
1 VR3
2 AFC voltage
3 OSC IN to UHF PLL
4 F_REF_RX, clock reference to the N7100
5 CLK19M2_TIKU, clock reference to Tiku
6 CLK19M2_GPS, clock reference to the
GPS subsystem
ISSUE 1 07/2005
VCTCXO
7
4
3 5
Figure 41: VCTCXO test point output values
Table 14: VCTCXO Test Point Output Values
©2005 Nokia Corporation
3155/3155i (RM-41), 3152 (RM-61)
RF Description and Troubleshooting
1
6
Value
2.8V
1 to 3 Volts (adjustable with the AFC slider
on the RF PDM Control in Phoenix)
1.2V for PDM 0
0V for PDM -1024
2.4V for PDM 1024
~ -9dBm
~ -9dBm
~ -9dBm, and ~2 dB less on the other side
of R7204 (located adjacent to the D2800)
~ -9dBm
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Figure 41.
Page 49