User Guide

PAMS

Technical Documentation

NSE–5

Troubleshooting

Page 4

Issue 1 07/99

1. Phone is totally dead

This means that phone doesn’t take current at all when the power switch

is pressed (X400 pin 7) or when the watchdog disable pin (X201 pin 11) is

grounded. Used battery voltage must be higher than 3.1 V. Otherwise the

hardware of CCONT (N100) prevents totally to switch power on.

Phone is totally dead.

Measure voltage at

C155 (VBAT)

3.6V

Measure voltage at

C153

3.6V

Power doesn’t stay on.

Ye s

Failure in VBAT.

Check X101, X102,

L103, L102, R102

Measure voltage at R413 (end

towards edge) when pwr–switch

(X400 pin 7) is pressed or

WDOGDISABLE (X201 pin 11)

is grounded.

(Will be low only during

power–up of CCONT if

power switch is pressed.)

Measure voltage at V113 pin 4

(Vbb) 2.8V

C112 (end towards bottom) (VXO)

2.8V

When PWR switch is pressed or

WDOGDISABLE is grounded.

Voltages OK?

Ye s

Check R413, V410

Check LCD–module

Check WDOGDISABLE line

Ye s

Faulty PCB

Figure 1.