Yamaha MCX-A10 Service Manual page 20

MCX-A10/MCX-SP10
When the unit can't play music.
<Step1>
music lists can be taken
<Step2>
Check that time counts
<Step3>
Can you hear the music ?
In case of CPU trouble on CORE Board
<Step1>
Check the RESET signal
<Step2>
<Step3>
<Step4>
In case of other troubles
• It is very difficult to find any other trouble around LSI because LSI is connected using the bus.
• However, if the trouble cause is not in the bus but something else, it may be possible to find it by using the TEST mode.
- Push TOP MENU & PLAY at the same time and power on.
- Monitor the log using LCD on MCX- A10.
20
Check that the
NG
from the server.
Play any songs
OK
NG
in "Play Info" menu.
OK
NO
YES
Good condition
NG
193pin of CPU (IC3 in CORE Board ) is OK?
OK
NG
Check CPU clock
156pin and 162pin of CPU (IC3 in CORE Board ) is OK?
OK
NO
Was accessing
FLASH executed?
YES 26pin of Flash memory (IC11 in CORE Board ) is OK?
YES
Does the FLASH /CS
work continuously?
NO
MAIN CPU may work well
• Trouble of network
• Trouble of wireless LAN card
• Trouble of CPU circuit in CORE Board
• Trouble of audio circuits in D-AMP Board
Reset circuit is defective
X'tal is defective
MAIN CPU may not boot up
Flash memory's trouble
or the SDRAM (IC7, 8) is defective