Nokia 9110 Service Manual

PAMS

Technical Documentation

RAE–2 

Troubleshooting 

Page 7  – 55

Original 02/99

In mechanical failures it is better to replace a whole unit or module than try
to fix it in service.  The replaceable units or modules on BS2 UI module are:

– BC2 CMT LCD module
– PDA LCD display
– UI PCB
– EL backlight panels
– Keydome sheets

 – Equipment: Resistance meter (multimeter)

 – If CMT keyboard does not function when the lid is closed, it is possible

that reed relay (in the BS1 module) is damaged. If text ”Please close
cover” comes to CMT LCD when a CMT key is pressed when lid is
closed, the reed relay is probably damaged.

 – Check that the dome sheets are properly placed. Improperly placed

dome sheet may cause malfunction of some key(s) or power down of
the CMT when a key is pressed.

Non–functioning CMT keys

Check components

6, 9, #

R704, C707

1, 2, 3, Soft_left

R705, C706

4, 5, Send, Up

R705, C714

7, 8, End, Down

R705, C713

0, *, Mode, Soft_right

R706, C712

3, 6, Send, End, Mode

R706, C708

9, Soft_left, Soft_right, Up, Down

R707, C709

1, 4, 7, #, *

R707, C710

2, 5, 8, 0

R708, C711