User Guide

RH-26
7 - Troubleshooting Instructions CCS Technical Documentation
Page 30 ©Nokia Corporation Issue 1 02/04
Figure 9: LCD signals
Figure 10: Location of LCD-related components
Keypad
RH-26 phone includes traditional T9 and qwerty keypads. The keys on the engine board
are connected through EMI/ESD filter Z300 (under UPP shielding can) to the KEYB(10:0)
bus to the UPP. Volume up/down functionality is combined with joystick functionality.
Two of the KEYB(10:0) lines are connected through EMI/ESD filter Z301 to the joystick.
Engine keypad includes half of the qwerty, PWR and “soft” keys. 5-way joystick is used
for navigation. The power on key is connected to the UEMK PWRONX signal and is not
part of the keypad matrix.
The flip keypad includes T9 and second half of the qwerty keys. SEND & END keys are on
the flip module. Keypad matrix is connected to the MCU located on the flip PWB. Key
presses are sent to UPP through flip interface. This interface consist of VBAT, DATA, CLK
and GND lines. GND connection is made through connector shielding and others with 3
flexible micro-coax cables, all included in one plug.