Receiver Trouble - LG CG225 Service Manual

4. TROUBLE SHOOTING

4.9 Receiver Trouble

Block Diagram
Control
Calypso
(U101)
SPK_EN
RCV_P/
IOTA
(U100)
Melody Generation
• U201(YMU792,MIDI) is controlled by DBB.
• U201 generates 64poly 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
YMU792
(U201)
Analog SW
(U204)
RC filter
RCV_N
SPKP/
SPKN
Analog SW
(U205)
- 56 -
RCV_SPKP/
RCV_SPKN
RECEIVER
&
SPEAKER