Nokia NHL-2NA Series Troubleshooting Instructions page 30

NHL-2NA
CCS Technical Documentation
0. At this point it is supposed that problem is in HW
1. Send something to another phone or laptop
2. Everything is ok
3. Activate phones IrDA selftest
4. Take off phones A-cover
5. Start test again from the beginning, there might be more than one fault...
6. Check pin number 1 with voltage meter, first the pad and then the pin, there is sup-
posed to be battery voltage
7. Make sure resistors R360 – R363 are connected and < 10ohm
8. Propably the fault is in PWB
9. Replace the IR module
10. Check Vcc, pins 6 and 7 in IR module, supposed to be connected to VMEMA, again
first the pads and then the pins
11. Looking for shortcircuits in capacitors C360-C363
12. Check lines 3, 4 and 5 in IR module with oscilloscope during IR selftest, there should
be series of pulses. Again check first pads and then pins.
13. Beyond economical repair
Page 24 ¤Nokia Corporation Issue 1 07/02