Tait TM8100 mobiles, Service Manual

Page: 157 / 620

TM8100/TM8200 Service Manual Servicing Procedures 157
© Tait Electronics Limited November 2007
Task 3 —
Power Up the Radio
With the radio connected to the test equipment as described in “Setting up
the Test Equipment” on page 115 , attempt to power up the radio.
1. Apply power to the radio. If the radio is programmed not to start on
power-on, press the
ON
/
OFF
switch.
Note
If the radio powers up but keeps resetting itself, check the power-
sensing circuitry. If the radio powers up but fails to enter user-
mode, or displays an error, refer to
Table 6.1 on page 160 .
2. If the radio powers up successfully, go to Task 4 . If it does not, go to
Step 3 .
3. Check the fuses, cables, and the power supply.
4. Check whether the control-head loom, the control head or the radio
body is faulty by first connecting a spare control-head loom and then
a spare control head.
5. If the control head is faulty, check the control-head connector
(pin 2: +13V8, pin 14: +3V3, pin 6: AGND), and repair or replace
the control-head board.
6. If the repair succeeded without the need for replacing the main-board
assembly, go to
Task 4 . Otherwise continue with Step 7 .
7. If the main-board assembly was replaced or if the repair failed, re-
assemble the radio as described in
“Disassembly and Reassembly” on
page 135 . Conclude with the tasks of “Final Tasks” on page 163 .