Tait TM8000 Series, Руководство по обслуживанию

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116 Servicing Procedure TM8100 Mobile Radio Service Manual
May 2004 © Tait Electronics Limited
RECEIVE AND RECEIVE-AUDIO FAULTS — PARTS 1 AND 2
1. Initial checks
(1) If the radio fails to receive, detach the control head as in Subsection 6.1 (on page 127) ,
and exchange it for a serviceable spare control head.
(2) Check if the radio receives.
(3) If the radio receives, the original control head is faulty; disconnect the spare control
head, and go to Part 2 below. If the radio still fails to receive, the radio body is faulty;
reconnect the original control head, and go to Part 3 in Figure 5.4.
2. Control head faulty
(1) If the control-head loom has already been checked, go to (5). If it has not, exchange
the loom for a serviceable spare loom.
(2) Check if the radio receives.
(3) If the radio receives, the original loom is faulty; go to (4). If the radio still fails to
receive, reconnect the original loom, and go to (5).
(4) Replace the faulty control-head loom, and return to Step 4 of Task 6.
(5) If the speaker and volume control have already been checked, go to (8). If they have
not, check if either is faulty. If there is no fault, go to (8). If there is a fault, repair it as
in
Subsection 7.1 (on page 151) .
(6) If the repair succeeded, go to (7). If the repair failed, return to Step 4 of Task 6.
(7) Check if the radio receives. If it does, return to Step 4 of Task 6. If it does not, go to
(8).
(8) Check the control-head connector and microphone connector on the control-head
board and the path between them.
(9) If either connector is faulty, remove the control-head board as in Subsection 6.2
(on page 131) , and replace the connector. If there is an obvious fault causing a break
in the path between the connectors, repair it. If no fault can be found, replace the
control-head board as in
Subsection 7.4 (on page 163) .
(10) Check if the radio receives.
(11) If the radio receives, return to Step 4 of Task 6. If the radio still fails to receive, re-
assemble the control head with the original control-head board, and return to Step 4
of Task 6.
Figure 5.3 Chart for locating and rectifying faults that affect the receive function — control head is
faulty