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
Signal From To Min Nom Max Note
BSI UEMCLite 0 2.78 Analog input, Battery Size
Indicator Resistor, 100
kohm pull up to 2.78V
(VBB1). FDL Init, refer to
flash download.
Battery interface
• Type: BL-5CA
• Technology: Li-Ion, 4.2 V charging, 3.1 V cut-off
• Capacity: 700 mAh.
BL-5CA has a 3 pin interface with overcharge / discharge protection (safety circuit) and battery size indication
BSI with an internal resistor. The BSI fixed resistor value indicates type and default capacity of a battery.
Figure 110 BL-5CA battery pack contacts
Table 15 Pin numbering of battery pack
Signal name Pin number Function
GND 1 Negative/common battery
terminal
BSI 2 Battery capacity measurement
(fixed resistor inside the battery
pack)
VBAT 3 Positive battery terminal
RM-394; RM-395; RH-118
System Module
Page 6 –18 COMPANY CONFIDENTIAL Issue 1
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