Fault Finding Of Control Head With 1- 2- Or 3-Digit Display - Tait TM8235 Service Manual

15 Fault Finding of Control Head with
1- 2- or 3-Digit Display
Overview
General
TM8100/TM8200 Service Manual
© Tait Electronics Limited June 2006
This section describes the fault finding of the control head with 1-, 2- or 3-
digit display for the following faults:
display faulty but not LEDs
some LEDs faulty
all LEDs faulty
display and all LEDs faulty
some but not all keys faulty
all keys faulty
speaker faulty
volume control faulty
The faults can be detected by visual inspection (refer to
User Interface" on page
The following applies for all fault finding procedures:
Important
Do not disconnect or connect the control head while
power is supplied to the radio.
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 149.

Fault Finding of Control Head with 1- 2- or 3-Digit Display

153).
"Check the
"Disassembling
141.
"Initial Tasks" on
429