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5. Function key can not work
Check voltage of IC301
pin38, 39, 40, 41, 42, 43 while key is
pressing
INPUT
MENU
MODE/DOWN
LEFT
RIGHT
Power-ON/OFF
6. No Sound
(Test signal: Vrms sine waveform)
Adjust VOLUME to max and check
IC801 pin 14, 17
Check wire harness is connected
from CN804, CN802 to earphone board
Earphone output normal
The speakers are failure
Check wire harness
is connected form I/F
board to Key
YES
YES
IC301 failure
Check IC801 Pin15, 16 is approximately 12V
YES
YES
YES
LL-T17A4-H/B TROUBLE SHOOTING
5 – 3
NO
The key cable is disconnected
NO
KeyBoard failure
NO
D807 failure
NO
Check IC801 Pin 12 is Low voltage
YES
IC801failure
NO
The cable is deiconnected
NO
CN805 is failure
NO
IC301failure
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