Check the battery condition of the Remote Control Unit.
Check against the a set that works normally to see if the RCU (Remote Control Unit) is working.
Check whether the connector between Digital Board and DTT&Analog Board is connected. (JP701)
Note that DTT board does not receive the key directly from RCU. Instead, MCU of digital board
gets the keys and passes them to DTT through the UART0. (Pin 34 &35 of JP701)
Basic Inspection
Mulfunction or Not Working of Remote Control Unit
Preliminary Checkpoints
< Waveform 1 >
Check the battery of the RCU.
Check the RCU.
Mulfunction or Not
Working of Remote
Control Unit
Check the UART0_RX signal
(Pin 33 of JP701)
Check signal line path to the
main CPU of DTT board
(U2)
Waveform 1 (When 'OK' key is pressed)
Replace the battery/RCU
Check the digital board /
Check the IR & LED board
NG
OK
Check the connector
(JP701)
Secure the connector
NG
OK
OK
NG
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