Receiver Trouble - LG MG210 Service Manual

4. TROUBLE SHOOTING

4.9 Receiver Trouble

Block Diagram
Block Diagram
Control
Calypso
(U101)
SPK_PHN_EN
RCV_P
IOTA
(U100)
Melody Generation
• U200(YMU762,MIDI) is controlled by DBB.
• U200 generates 40poly MIDI sound and it is delivered to the speaker
• When RCV_SPK_SEL and SPK_PHN_EN are 'H', RCV_P from U100 is delivered to the speaker
through U200
Signals to the receiver
• RCV_P,RCV_N From ABB
• RCV_N, RCV_P are delivered to Receiver, when RCV_SPK_SEL and SPK_PHN_EN are 'L'.
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
(U200)
Analog SW
(U203)
RC filter
RCV_N
- 52 -
SPKP/
RCV_SPK_SEL
SPKN
SPK_RCVP/
SPK_RCVN
Analog SW
(U202)
RECEIVER
&
SPEAKER