Nokia 2270, 2272, 2275, 2285 Service Manual

CCS Technical Documentation

Troubleshooting — BB

RH-3

Issue 1 06/2003

Nokia Corporation         Confidential 

Page 3

Baseband Troubleshooting............................................................................................. 5

RH-3 Baseband Module Overview ..............................................................................5
HW Architecture ..........................................................................................................6
Flash programming  ......................................................................................................6

Connections to Baseband .......................................................................................... 6
Baseband Power Up .................................................................................................. 6
Flash Programming Indication .................................................................................. 6
Flashing ..................................................................................................................... 7
Power Up and Reset .................................................................................................. 9
Power up with PWR key ......................................................................................... 11
Power up when charger is connected ...................................................................... 11
RTC alarm power up ............................................................................................... 12

Power off  ...................................................................................................................12
Power Consumption and Operation modes  ...............................................................12
Power Distribution .....................................................................................................13
Clock Distribution  .....................................................................................................14

RFClk (19.2 MHz Analog)...................................................................................... 14
RFConvClk (19.2 MHz digital) .............................................................................. 15

CBUSClk Interface ....................................................................................................15

DBUSClk Interface ................................................................................................. 16
SLEEPClk (Digital)................................................................................................. 17
SLEEPClk (Analog) ................................................................................................ 17

Charging operation  ....................................................................................................18

Battery ..................................................................................................................... 18
Charging circuitry ................................................................................................... 18
Charger Detection ................................................................................................... 19
Charge Control ........................................................................................................ 20

Audio .........................................................................................................................20
Display and Keyboard  ...............................................................................................20
Accessory ...................................................................................................................21
Test Points  .................................................................................................................22
Troubleshooting .........................................................................................................23
Top troubleshooting map  ...........................................................................................24

Phone is totally dead ............................................................................................... 26
Flash programming doesn‘t work ........................................................................... 27
Power doesn‘t stay on or the phone is jammed ....................................................... 29
Charger .................................................................................................................... 31
Audio faults ............................................................................................................. 32
Display faults........................................................................................................... 36
Keypad faults........................................................................................................... 38