Fig 37 Testpoints - Nokia NPL-4 Series Troubleshooting Instructions

NPL-4/5/RM-104
Troubleshooting Instructions
Magnetometer output interface testpoints
Channel A output J331(+), J332(-), Channel B output J329(+), J328(-)
- Difference voltage is normally 0.0V between (+) and (-)
- Referred to ground output voltage is 1.1V typ. (1.0V to 1.2V)
Magnetometer control interface testpoints
Set/Reset pulse J327
Vbridge J326
Check calibration values
- x and y gain (abs(max-min)) would be range of 300 to 1700
- offsets (not precalculated) for both channels , calculated as (max- gain/2)
- normal variation would be range +-1000 to +1000
- offset values are not precalculated
- ratio of x/y gain would be range of 0.75 to 1.33
- scorra range, normal case 1.0 to 1.2
- scorrb range, normal case 0.0 to 0.2
Check compass respond with some ferrometal object
- both channels must react
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Figure 37: Testpoints
Nokia Customer Care
Issue 2 05/05