Receiver Trouble - LG MG180C Service Manual

4.8 Receiver Trouble

Block Diagram
Control
Calypso
(U101)
SPK_EN
RCV_P/
IOTA
(U100)
Melody Generation
• U201(YMU762,MIDI) is controlled by DBB.
• U201 generates 40poly MIDI sound and it is delivered to the speaker
Signals to the receiver
• EAR_N, EAR_P From ABB
• EAR_N, EAR_P are delivered to Receiver
Check Points
• Audio signals from ABB
• Audio signals to the receiver
• Audio signal path
• Check the sound level to the speaker.
• Soldering of connectors, speaker and receiver
• Speaker
• Receiver
YMU762
(U201)
Analog SW
(U200)
LC filter
RCV_N
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4. TROUBLE SHOOTING
SPKP/SPKN
SPEAKER
RCVP/RCVN
RECEIVER