Receiver Trouble - LG G5500 Manual

4.8 Receiver Trouble

Block Diagram
Calypso
(U101)
IOTA
(U102)
Melody Generation
• U301(YMU762,MIDI) is controlled by DBB.
• U301 generates 40poly MIDI sound and it is delivered to the speaker via U303 (analog SW) &
connector socket.
Signals to the receiver
• RCV_P,RCV_N From ABB
• SPK_RCVN, SPK_RCVP to Receiver via U303 (analog SW) & connector socket
Check Points
• Audio signals from ABB
• Audio signals to the receiver
• Audio signal path
• Check the sound level to the speaker.
• Soldering of connector & speaker/receiver
• Speaker/Receiver
Control
YMU762
(U301)
RCV_P/
RCV_N
RC filter
SPKP/SPKN
Analog SW
(U303)
EAR_P/
EAR_N
-61-
RECEIVER
SPK_RCVP/
(SPK)
SPK_RCVN