6.6.3 Alarm LED Failures
Fault Symptom
Possible Cause
Countermeasure
Alarm LED off or
cannot be turned
off, or alarm LED
displays
abnormally
Cable defective or
improperly
connected
1. Verify the cable connecting the button board to
the main board is properly connected.
2. Verify the cables and connectors are not damaged.
Button board failure
Replace the button board
Main board failure
Replace the main board.
6.6.4 Button and Knob Failures
Fault Symptom
Possible Cause
Countermeasure
Buttons do not
work
Cable defective or
improperly connected
1. Verify the cable connecting the button board to
the main board is properly connected.
2. Verify the cables and connectors are not
damaged.
Button board failure
Replace the button board
Knob does not
work
Cable defective or
improperly connected
1. Verify the cable connecting the knob to the main
board is properly connected.
2. Verify the cables and connectors are not
damaged.
Knob failure
Replace the rotary encoder.
6.6.5 Audio Failures
Fault Symptom
Possible Cause
Countermeasure
No sound or
abnormal sound
while the button or
rotary encoder is
normal
Key volume set to 0
Choose [
Main Menu
] → [
Screen Setup >>
] →
[
Key Volume >>
] to adjust the key volume.
Cable defective or
improperly connected
1. Verify the cable connecting the speaker to the
main board is properly connected.
2. Verify the cables and connectors are not
damaged.
Speaker failure
Replace the speaker.
Main board failure
Replace the main board.
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