Rx Rf - Nokia RH-57 Series Troubleshooting Manual

Nokia Customer Care

Rx RF

The following Rx RF Troubleshooting table indicates the test points to probe when
troubleshooting the Rx RF. It is recommended that you follow the steps in order. See
Figure 18 on page 28 for an illustration of the test points.
Step # Part
R1 L802R (Top
side of the
PWB)
R2 L906L
R3 C903L
R4 Z901-R-Bot-
tom, N901-
Pin16
R5 C906R
R6 C912B/R914R
R7 R912B/R911L
R8 R9056T,
L909L, L901T,
R910B
R9 R902B
* 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 18.
Issue 1 07/2004
Table 14: Rx RF Troubleshooting
Typical
Value/
Function
Frequency
HP85024A
RF-IN -25dBm/
881.52MHz
LNA-In -35dBm/
881.52MHz
LNA-Out -13/-31dBm
881.52MHz
RF Filter Output -18/-35dBm
Mixer-In 881.52MHz
Mixer-out -5/-21dBm
183.6 MHz
IF Output to +1.5/-15dBm
N700 183.6MHz
L.O Input to -2.5dBm
N901 1065.12MHz
VR4 2.7V dc
Rx-SW1 H.G = 2.7V
L.G = 0V
©2004 Nokia Corporation
Troubleshooting - RF
Typical
Value
Comments
Frequency
Prod Probe
-42dBm Input Connector reference
881.52MHz level
-42dBm Test Duplexer insertion Loss
881.52MHz (Without DC Block)
-29/-45dBm Test LNA gain ~ 13dB
881.52MHz
-30/-45dBm Test RF Filter Insertion loss
881.52MHz (Without DC Block)
-23/-38dBm Test Output on Downcon-
183.6MHz verter on N901
-12/-29dBm Test Alfred output to Yoda
183.6MHz IF-IC (N700)
-18dBm Test VCO output to Alfred
1065.12MHz (N901) Levels are for Chan-
nel 384
Power supply to Alfred
(N901)
LNA gain control, on the
Alfred side, High Gain >
2.5V dc
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