Tait TM8000 Series, Service Manual

Page: 117 / 244

TM8100 Mobile Radio Service Manual Servicing Procedure 117
May 2004 © Tait Electronics Limited
RECEIVE AND RECEIVE-AUDIO FAULTS — PART 3
3. Radio body faulty
(1) Enter the CCTM command 72 to check if the radio is in lock.
(2) If the radio is in lock, go to (6). If it is not, check the programming file, and in
particular the frequency band and channel frequencies.
(3) If the programming file is OK, go to (13). If it is not, reprogram the radio.
(4) Check if the radio is in lock. If it is, go to (5). If it is not, go to (13).
(5) Check if the radio receives. If it does, return to Step 4 of Task 6. If it does not, go to
(6).
(6) Check the receiver sensitivity. If the sensitivity is OK, go to (7). If it is not, go to (9).
(7) Check the squelch function. If it is OK, go to (9). If it is not, recalibrate the radio.
(8) Check if the radio receives. If it does, return to Step 4 of Task 6. If it does not, go to
(9).
(9) Remove the lid of the radio body as in Subsection 6.3 (on page 137) , and check the RF
connector.
(10) If the connector is OK, go to (13). If it is faulty, go to (11).
(11) At level-1 service centres, go to (13) and replace the main-board assembly. At level-2
service centres, remove and disassemble the main-board assembly as in
Subsection 6.3 ,
replace the connector, and re-assemble the main-board assembly as in Subsection 6.4
(on page 144) .
(12) Check if the radio receives. If it does, return to Step 4 of Task 6. If it does not, go to
(13).
(13) Repair or replace the main-board assembly as in Section 8 (on page 165) .
(14) The final test in Section 8 will indicate whether the repair succeeded or failed. Return
to Step 4 of Task 6.
Figure 5.4 Chart for locating and rectifying faults that affect the receive function — radio body is
faulty