User Guide
Table Of Contents
- Amendment Record Sheet
- Copyright
- Warnings and cautions
- For your safety
- Care and maintenance
- ESD protection
- Battery information
- Company Policy
- Nokia 1680c; Nokia 1681c Service Manual Structure
- 1 General Information
- 2 Service Tools and Service Concepts
- 3 Baseband Troubleshooting Instructions
- General baseband troubleshooting
- SIM related faults
- User interface
- Audio troubleshooting
- Audio troubleshooting using phoenix
- Check microphone using "Hp microphone in Ext speaker out" loop
- Check earpiece using "Ext microphone in Hp speaker out" loop
- Check IHF & ringing tone function using "Buzzer"
- Check vibra function using "Vibra control"
- Earpiece fault
- IHF/ringing tone fault
- Microphone fault
- Headset earpiece fault
- Headset microphone fault
- 4 RF Troubleshooting Instructions
- 5 Camera Module Troubleshooting (Only for RM-394/RM-395)
- 6 System Module
- Glossary

PWB outline
Figure 111 PWB outline
RF description
Frequency band, power and multi-slot class
The requirement leads to the specification in the table below:
Table 16 Frequency bands and TX power class
System Frequency band TX power class
GSM900 Tx: 880 – 915 MHz 4 (33dBm)
Rx: 925 – 960 MHz
GSM1800 Tx: 1710 – 1785 MHz 1 (30dBm)
Rx: 1805 – 1880 MHz
Table 17 Multi-slot class
Multislot Class
GPRS MSC 10 (4Dn/2Up), sum=5
E-GPRS MSC 6 in DL, max. 3Dn
RM-394; RM-395; RH-118
System Module
Issue 1 COMPANY CONFIDENTIAL Page 6 –19
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