Fault Finding Of Control Head - Tait TM9100 Service Manual

14

Fault Finding of Control Head

This section describes the fault finding of the control head for the following
Overview
faults:
The faults can be detected by visual inspection (refer to
on page
The following applies for all fault finding procedures:
General
Important
TM9100 Service Manual
© Tait Electronics Limited August 2005
power supply faulty (initial check)
LCD display faulty
LCD backlighting faulty
LCD contrast faulty
LCD heating faulty
function key LEDs or status LEDs faulty
keypad backlighting faulty
/
key faulty
ON OFF
function, scroll, or selection keys faulty
speaker faulty
volume control faulty
PTT faulty
128) or using the CCTM commands in
Do not disconnect or connect the control head while
power is supplied to the radio.
To connect to ground use one of the screw bosses of the metal
spaceframe or the screw bosses of the radio body.
If the radio does not switch on when power is supplied, the radio may
be programmed to go into the status it was in when powered down.
Connect a known good control head, power up the radio, and change
the relevant setting in the programming application. Remember to
program the original setting before returning the radio to the customer.
For disassembly and re-assembly instructions, refer to
and Reassembling the Control Head" on page
If the repair fails or no fault could be found, replace the control-head
board.
After completing the repair, carry out the tasks in
page 147.
"Visual Inspection"
Table 14.1 on page
"Disassembling
135.
"Final Tasks" on
Fault Finding of Control Head
398.
397