Nokia 3390, 3390b, 3395 服务手册

NPB-1NB

Baseband Troubleshooting

PAMS Technical Documentation

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The phone is dead

The voltage at C404, C202,

C226, C227, C228 is = 3,6V

Failiure in Vbatt line.

Check X203, R220.

No

Voltage on R224 = 3,6V

Defective N201 or

PCB

Yes

No

Voltage at C316= 2,8V

Voltage at C243 = 2,8V

when WDDISX is grounded

Yes

WDDISX = 0 when

PWR switch is pressed

No

Defective CCONT

(N201)

Yes

Check power switch

Check WDDISX line :
PWR switch  -> R402

->R224

No

Defective PCB

Ok

See section "Phone is

unable to stay ON"

Yes