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First，check cables which connect with PSU，then check as follows
1) Check input voltage as NO picture
2) Check speaker output
First, check speaker anode (+) and cathode (-),confirm speaker short or not. If short , replace speaker.
Second, check CN2, CN3 with oscillograph, confirm wave output or not.
Connector: CN2, CN3
10.2 PSU failure check
State: No power
First, check cables which connect with PSU, then check as follows
1) Check PSU input voltage（AC input）
voltage : ～120V
connector:CON1（P1,P5）
2）Check PSU output voltage orderly：
voltage :+5V(Stand-By)→ON（5.0V）→+24V ,+12V
connector:CON4（3）→CON4（1）→CON4（6,7）,CON2（1-4）
State：No sound
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