Rx Rf - Nokia RH-77 Troubleshooting Manual

2118 (RH-77)
RF Description and Troubleshooting

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
Step # Part
R1 L802R (Top
side of the
PWB)
R2 L906L
R3 C903L
R4 Z901-R-
Bottom,
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
Page 26
27 for an illustration of the test points.
Table 14: Rx RF Troubleshooting
Typical
Value/
Function
Frequency
HP85024A
RF-IN -25 dBm/
881.52 MHz
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
©2005 Nokia Corporation
Nokia Customer Care
Typical
Value
Comments
Frequency
Prod Probe
-42 dBm Input Connector reference
881.52 MHz 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
183.6MHz Downconverter on N901
-12/-29dBm Test N2302 output to N700
183.6MHz IF-IC
-18dBm Test VCO output to N2302
1065.12MHz Levels are for Channel 384
Power supply to N2302
LNA gain control, on the
N2302 side, High Gain >
2.5V dc
Figure 18.
Company Confidential Issue 01 04/2005