User Guide

ISSUE 1 09/2004 COMPANY CONFIDENTIAL 11

RH-53/54

Nokia Customer Care

■ Power does not stay on or phone is jammed

If this kind of failure is presenting itself immediately after FLALI, it is most likely caused by

ASICs missing contact with PWB.

If for some reason the MCU does not service the watchdog register within the UEM, the oper-

ations watchdog will run out after approximately 32 seconds. Unfortunately, the service routine

can not be measured.

Figure 5:Phone jammed troubleshooting

Power doesn't stay on,

or phone is jammed

J404

Sleep clock = 32.768 kHz,

1.8Vpp

Yes

Check :

D450, Keymat,

Lightguide, PWB.

Else defective D400*

UI functionality,

and keys react

to pressure?

Check :

PWB.

Else defictive D200*

Yes

J402

PURX = 1,8VDC,

1 sec. after power-key is

pressed

Check :

C420, C426, R420,

R426, N600(Mjoelner)

Yes

Reflash phone

Check :

B200, C209, C210, PWB.

Else defective D200*

R426

26 MHz clock min.

300mVACpp,

probe Cin=10-13 pF/10M