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
GSM Rx chain activation for manual measurements / GSM RSSI measurement
, and for the same measurement in WCDMA, see
WCDMA RSSI measurement (page 7–13)
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)
RM-132; RM-133
RF Troubleshooting and Manual Tuning Guide
Nokia Customer Care
Issue 1
COMPANY CONFIDENTIAL
Page 7 –11
Copyright © 2006 Nokia. All rights reserved.