Synthesizer test points
Measure RF ASIC N7505 RF ASIC N7500 Expected Result
VCTXCO output voltage G7501 pin 3 G7500 pin 3 38.4MHz 800 mVpp
RFCLKEXT 38.4MHz 500 mVpp
VCTXCO AFC voltage C7507 C7505 1V
Measure RF ASIC N7505 RF ASIC N7500 Expected Result
VCO G7500 G7501 3526,4 MHz
Measure RF ASIC N7505 RF ASIC N7500 Expected Result
VCO supply voltage L7515 C7509 2.8V
Measure RF ASIC N7505 RF ASIC N7500 Expected Result
VCO control voltage C7516 C7510 1 to 3 V
RF ASIC N7505 RF ASIC N7500
C7516, C7511, R7501, R7511 C7510, C7512, R7503, R7504
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 7–13), and for the same measurement in WCDMA, see WCDMA RSSI measurement (page 7–14).
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.
See also
• WCDMA Rx chain activation for manual measurement (page 7–13)
RM-91; RM-92
Nokia Customer Care RF Troubleshooting and Manual Tuning Guide
Page 7 –12 COMPANY CONFIDENTIAL Issue 1
Copyright © 2006 Nokia. All rights reserved.
To Next Page
Loading...
