Nokia 5140 サービスマニュアル

NPL-4/5

Company confidential

Troubleshooting Instructions

Nokia Customer Care

Page 94

Issue 1 05/04

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

Figure 37: Testpoints

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