Topfield TF4000FI, Руководство по обслуживанию, Страница: 10 / 62

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5.2. Basic Function Test
5.2.1. No LED is turned on
Possible Cause How to Check How to repair
1 Front Board Problem Replace the Front Board with
new one which works well in the
other IRD If it works, repair the Front Board.
Otherwise, check the Main Board
and SMPS.
5.2.2. Some LED have problems
Possible Cause How to Check How to repair
1 Front Board or cable
Problem
Replace the Front Board with
new one. Check the LED and the cable.
5.2.3. Remote Control Unit (RCU) does not work.
Possible Cause How to Check How to repair
1 Remote Controller may
have some problem. If some keys of RCU do not
work, it may be RCU problem. Replace the RCU with new one.
2 Sensor of the Front
Board may have problem If key and LEDs work well, and
only the Remote control does
not work, it is sensor problem. Check the PCB pattern of Front
Board.
Check the power of U1(sensor).
Replace the sensor.
5.2.4. Key of the front panel have problems
Possible Cause How to Check How to repair
1 If the power key does not
work, it may be caused
from either the Main
Board or the Front Board
problem. Replace the Front Board with
new one which works well in the
other IRD If it works, repair the Front Board.
If it does not work, repair the Main
Board.
2 If some of the key does
not work, it is the Front
Board problem.
Pattern or broken tact
switch can be a problem If one of the key or RCU work, it
is the problem of the switch or
PCB pattern of the Front Board. Check the switch and the PCB
pattern of Front Board.
5.2.5. Receiver acts like the key of the Front Board or RCU is pressed.
Possible Cause How to Check How to repair
1 The key of the Front
Board is pressed always. Replace the Front Board and
check it. Replace the broken key with new
one. Check the Front PCB.