Interface Fault Finding - Tait TP9100 Service Manual

7

Interface Fault Finding

Overview
This section describes fault finding of the user interface and accessories
interface connector. User interface fault finding includes the following:
The faults can be detected by visual inspection (refer to
page
General
The following notes apply to all interface fault finding procedures:
Task 1 —
Use this procedure for faults with numeric keys, scroll keys, selection keys
Front Panel Keypad
or keypad backlighting. Before proceeding, make sure the fault is not an
Faulty
issue with programming. For backlighting faults, make sure backlighting is
enabled in the programming application. For keypad faults (16-key models
only), make sure full keypad functionality is enabled via the Software Feature
Enabler in the programming application.
If the keypad is faulty:
1.
2.
3.
4.
5.
6.
TP9100 Service Manual
© Tait Electronics Limited May 2005
Front panel keypad. This includes the numeric keypad, scroll and
selection keys, and keypad backlighting.
LCD. This includes the LCD display and LCD backlighting.
Top and side of radio. This includes the
3-way and 16-way selectors, status LED indicators, function keys and
PTT, and internal speaker/microphone.
127) or using CCTM commands (refer to
For disassembly and reassembly instructions, see
Reassembly" on page 101.
After completing the repair, carry out the tasks in
page 134.
The main-shield assembly and LCD assembly are non-serviceable items,
and must be replaced in their entirety if faulty. For more information
refer to "Spare Parts" on page
Remove the front panel.
Remove the main-shield assembly, and fold the assembly open leaving
the loom connected between the front panel and the main board.
Check the integrity of the front-panel loom and confirm it is seated
correctly at both ends (
Reassemble and power-up the radio. Check the functionality of the
keypad.
If still faulty, remove the front panel and replace the front-panel loom
with a known good one.
Reassemble and power-up the radio. Check the functionality of the
keypad.
/
switch, volume control,
ON OFF
Table 4.7 on page
"Disassembly and
"Final Tasks" on
289.
and ).
RADIO KEYPAD

Interface Fault Finding

"Initial Tasks" on
96).
139