CCS Technical Documentation 6-Troubleshooting
Company Confidential NMM-3
Issue 1 (11/2003) Copyright  2003 Nokia Corporation Page 6-29
Company Confidential
FBUSTX 401 J400 Pin 2 Flash programming data
and phone control
2.78V digital signal From phone to FPS-8 / PC
MBUS 402 J400 Pin 7 Flash programming clock 2.78V digital signal 6.5
MHz max
COL2 403 R435 Key pad column 1.8V digital signal
COL1 404 R436 Key pad column 1.8V digital signal
COL0 405 R437 Key pad column 1.8V digital signal
ROW5 406 R438 Key pad row 1.8V digital signal
+VLCDLED 407 V400 Cath-
ode
Supply for Key and LCD
LEDs
~10.5V 18V max open circuit
-VLCLED 408 R408 LCD LED current sense ~0.5V
KLIGHT 409 N402 Pin 2 Key LED control signal Vbat Active low
DLIGHT 410 N400 Pin 8 Display LED control signal Vbat Active high
1KEYLED 411 R426 Key light current sense
resistor
~1.9V
SIMDATA 412 X403 Pin 6 SIM data 1.8V / 3V digital signal From UEME to SIM card
SIMCLK 413 X403 Pin 1 SIM Clock 1.8V / 3V digital signal From UEME to SIM card
SIMRST 414 X403 Pin 2 SIM Reset 1.8V / 3V digital signal From UEME to SIM card
HOOKINT 415 J407 Accessory off hook inter-
rupt signal
2.8V no accessory
1.8V accessory connected
1.1V button pressed
ACI 416 C425 Accessory detection and
digital communications
bus
2.78V digital sinal Bidirectional data
VBUS 417 C422 USB external supply in
from host
~5.0V
Vreg 418 C414 USB IO supply 3.3V
D+ 419 C421 USB data 3.3V digital signal 12MHz
D- 420 C424 USB data 3.3V digital signal 12MHz
XMICN 421 L404 External microphone neg-
ative
0V no accessory con-
nected
Value with accessory con-
nected varies with acces-
sory type.
XMICP 422 L403 External microphone posi-
tive
2.1V no accessory con-
nected
Value with accessory con-
nected varies with acces-
sory type.
XEARN 423 L405 External ear negative left /
mono
1.35V dc - signal
XEARP 424 L406 External ear positive left /
mono
1.35V dc + signal
XEARNR 425 L407 External ear negative right 1.35V dc - signal
XEARPR 426 L408 External ear positive right 1.35V dc + signal
VCHAR 427 V403 Cath-
ode
Charger voltage ~4.2V charging
~8.0V charge switch open
When:
Ibat = 500mA
Vbat = 3.8V
CLK 450 J450 SDRAM Clock 1.8V digital signal
FlsCLK 451 J451 Flash Clock 1.8V digital signal
VOUT 452 C451 SDRAM Supply voltage 2.85V
VPP 453 C453 Flash programming volt-
age
1.8V Internal
12V External
FPS-8 external VPP source
OUT 300 C301 COWIS regulator out 1.8V
RFCKOCK 301 C300 Reference Clock 19.2MHz
Signal Ref Test point Function Characteristic Note
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