Synthesizer Test Points; Receiver Troubleshooting; Introduction To Rx Troubleshooting; Gsm Rx Chain Activation For Manual Measurements / Gsm Rssi Measurement - Nokia RM-132 Service Manual & Parts Manual

RM-132; RM-133
RF Troubleshooting and Manual Tuning Guide

Synthesizer test points

Measure
VCTXCO output voltage
RFCLKEXT
VCTXCO AFC voltage
Measure
VCO G7500
Measure
VCO supply voltage
Measure
VCO control voltage
RF ASIC N7505
C7516, C7511, R7501,
R7511

Receiver troubleshooting

Introduction to Rx troubleshooting

Rx can be tested by making a phone call or in the local mode. For the local mode testing, use Phoenix service
software.
The primary Rx troubleshooting parameter RSSI (Receiving Signal Strength Indicator). For GSM RSSI
measurement, see

GSM Rx chain activation for manual measurements / GSM RSSI measurement

(page 7–12), and for the same measurement in WCDMA, see
In GSM, the input signal can be either a real GSM signal or a CW (Continuous Wave) signal, which is 67.771
kHz above the carrier frequency.
In WCDMA, the input signal can be either a real WCDMA signal or a CW signal, which is 1 MHz above the carrier
frequency.
For service tool usage instructions, refer to section Service Tools and Service Concepts.

Related information

• WCDMA Rx chain activation for manual measurement (page 7–12)
Issue 1
RF ASIC N7505
G7501 pin 3
C7507
RF ASIC RF ASIC
N7505 N7500
G7501
RF ASIC RF ASIC
N7505 N7500
L7515 C7509
RF ASIC RF ASIC
N7505 N7500
C7516 C7510
RF ASIC N7500
C7510, C7512, R7503,
R7504
COMPANY CONFIDENTIAL
Copyright © 2006 Nokia. All rights reserved.
RF ASIC N7500 Expected Result
G7500 pin 3 38.4MHz 800 mVpp
38.4MHz 500 mVpp
C7505 1V
Expected
Result
3526,4 MHz
Expected
Result
2.8V
Expected
Result
1 to 3 V
WCDMA RSSI measurement (page
Nokia Customer Care
7–13).
Page 7 –11