User Guide

RH-48
Troubleshooting - RF CCS Technical Documentation
Page 26 ©2003 Nokia Corporation Confidential Issue 1 11/2003
Rx RF
The following Rx RF Troubleshooting table indicates the test points to probe when trou-
bleshooting the Rx RF. It is recommended that you follow the steps in order.
* The R, L, T, and B values at the end of the part names indicate the Right, Left, Top, and Bottom side
of the part respectively in Figure 17.
Rx RF Troubleshooting
Step # Part* Function
Typical Value/
Frequency
HP85024A
Typical Value
Frequency
Prod Probe
Comments
R1 L802R (Top
side of the
PWB)
RF-IN -25dBm/
881.52MHz
-42dBm
881.52MHz
Input Connector reference level
R2 L906L LNA-In -35dBm/
881.52MHz
-42dBm
881.52MHz
Test Duplexer insertion Loss
(Without DC Block)
R3 C903L LNA-Out -13/-31dBm
881.52MHz
-29/-45dBm
881.52MHz
Test LNA gain ~ 13dB
R4 Z901-R-Bot-
tom, N901-
Pin16
RF Filter
Output
Mixer-In
-18/-35dBm
881.52MHz
-30/-45dBm
881.52MHz
Test RF Filter Insertion loss
(Without DC Block)
R5 C906R Mixer-
out
-5/-21dBm
183.6 MHz
-23/-38dBm
183.6MHz
Test Output on Downconverter on
N901
R6 C912B/R914R IF Output
to N700
+1.5/-15dBm
183.6MHz
-12/-29dBm
183.6MHz
Test Alfred output to Yoda IF-IC
(N700)
R7 R912B/R911L L.O Input
to N901
-2.5dBm
1065.12MHz
-18dBm
1065.12MHz
Test VCO output to Alfred (N901)
Levels are for Channel 384
R8 R9056T, L909L,
L901T, R910B
VR4 2.7V dc Power supply to Alfred (N901)
R9 R902B Rx-SW1 H.G = 2.7V
L.G = 0V
LNA gain control, on the Alfred
side, High Gain > 2.5V dc