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
Figure 45 RX I/Q signals...................................................................................................................................... 4–15
Figure 46 GSM 900 RF controls window............................................................................................................ 4–16
Figure 47 GSM900 tarnsmitter troubleshooting .............................................................................................. 4–17
Figure 48 TX I/O signal........................................................................................................................................ 4–18
Figure 49 VC1, VC3 signals .................................................................................................................................. 4–18
Figure 50 TXP signal............................................................................................................................................ 4–19
Figure 51 TXC signals at PCL5 ............................................................................................................................. 4–19
Figure 52 TXC signals at PCL19........................................................................................................................... 4–20
Figure 53 GSM 1800 RF controls window.......................................................................................................... 4–21
Figure 54 GSM1800 transmitter troubleshooting ............................................................................................ 4–22
Figure 55 TX I/O signal........................................................................................................................................ 4–23
Figure 56 VC1, VC2, VC3 signals .......................................................................................................................... 4–23
Figure 57 TXP signal............................................................................................................................................ 4–24
Figure 58 TXC signals at PCL0 ............................................................................................................................. 4–24
Figure 59 TXC signals at PCL15........................................................................................................................... 4–25
Figure 60 GSM850 RF controls window............................................................................................................. 4–26
Figure 61 GSM850 receiver troubleshooting .................................................................................................... 4–27
Figure 62 850 RX I/Q signal waveform.............................................................................................................. 4–28
Figure 63 GSM 1900 RF controls window.......................................................................................................... 4–29
Figure 64 GSM1900 receiver troubleshooting .................................................................................................. 4–30
Figure 65 1900 RX I/Q signal waveform............................................................................................................ 4–31
Figure 66 RX measurements point of the control voltages to FEM N7700.................................................... 4–32
Figure 67 Measurement points at the RX SAW Filters – Z7600/Z7602 ........................................................... 4–32
Figure 68 RX I/Q signals...................................................................................................................................... 4–33
Figure 69 GSM 850 RF controls window............................................................................................................ 4–34
Figure 70 GSM850 transmitter troubleshooting .............................................................................................. 4–35
Figure 71 TX I/O signal........................................................................................................................................ 4–36
Figure 72 VC1, VC3 signal.................................................................................................................................... 4–36
Figure 73 TXP signal............................................................................................................................................ 4–37
Figure 74 TXC signals at PCL5 ............................................................................................................................. 4–37
Figure 75 TXC signals at PCL19........................................................................................................................... 4–38
Figure 76 GSM 1900 RF controls window.......................................................................................................... 4–39
Figure 77 GSM1900 transmitter troubleshooting ............................................................................................ 4–40
Figure 78 TX I/O signal........................................................................................................................................ 4–41
Figure 79 VC1, VC2, VC3 signals .......................................................................................................................... 4–41
Figure 80 TXP signal............................................................................................................................................ 4–42
Figure 81 TXC signals at PCL0 ............................................................................................................................. 4–42
Figure 82 TXC signals at PCL15........................................................................................................................... 4–43
Figure 83 VCXO 26 MHz waveform..................................................................................................................... 4–44
Figure 84 PLL Troubleshooting diagram........................................................................................................... 4–45
Figure 85 Measurement point for VCXO ............................................................................................................ 4–46
Figure 86 Antenna troubleshooting.................................................................................................................. 4–47
RM-394; RM-395; RH-118
RF Troubleshooting Instructions
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