130 Servicing Procedures TP9100 Service Manual
© Tait Electronics Limited May 2005
Task 7 —
Check the
User Interface
Check the user interface as follows:
1. Use the programming application to activate backlighting, deactivate
silent and quiet modes, and view the programmed function keys,
channels and scan groups.
2. Turn on the radio, make sure that the volume control is not set to low,
and check the start-up sequence:
■ the LED lights up amber briefly
■ the speaker gives two short beeps
■ LCD and keypad backlighting activates
■ the LCD displays a power-up message then a channel number, or
an error message.
3. Check for the following elements of the user interface:
■ power/volume control: Use CCTM command 804 to read the
volume potentiometer. The returned value should be between
340 and 800.
■ zone/channel control: Scroll through all settings and observe the
radio display.
■ LCD: Check visually or use CCTM command 855 165 to switch
on all LCD elements. CCTM command 855 164 resets the LCD
to its original state.
■ PTT key: While pressing the PTT key, the transmit symbol or
should appear on the radio display (unless transmit is inhibited
on the selected channel).
■ function keys: Check whether the programmed function is
activated.
■ emergency key: Check whether the programmed function is
activated.
■ keypad: After locking the keypad (press and hold the right
selection key), each keypress should be acknowledged by a long
low-pitched beep, indicating an invalid keypress.
■ backlighting (if programmed): Any keypress should activate
backlighting.
4. If there is a fault in the user interface, repair the radio as described in
“Interface Fault Finding” on page 139.
5. If there is no fault, go to Task 8
.
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