TP9100 Service Manual Interface Fault Finding 147
© Tait Electronics Limited May 2005
Tas k 9 —
Accessories
Interface Faulty
Use this procedure for the following faults with the accessories interface:
■ Faulty accessory
■ Dirt, moisture or dust on the connector
■ Serial communications fault
■ External audio fault
■ Digital I/O fault
Note If the fault is with external audio (speaker or microphone), audio
tap in or tap out, the external PTT, or an external function key,
first complete tasks related to the symptom in “CODEC and
Audio ault Finding” on page 269.
If the accessories interface is faulty:
1. Remove the front panel, main-shield assembly, and rear panel.
2. Replace the flexible accessory board with a known good one.
3. Reassemble and check the functionality of the accessories interface.
4. If the accessory interface operates as expected, the flexible accessory
board was faulty. Discard and use a new one (see “Spare Parts” on
page 289). If still faulty, check for faults with the accessory connector
PL1 on the main board, and components around PL1.
5. If a fault is found, repair and recheck the functionality of the
accessories interface. If still faulty or a fault cannot be found with
PL1, replace the main board.
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