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[CHART 2]
No AC mains
(System keyboard)
Verify that
the power supply cord is
plugged in correctly
Verify that
the AC main voltage is
as specified
Check to see
if the fuse has blown
Check the voltage (DC+5V)
at TP101 on the SY-211 board
Verify that
the voltage is DC+5V
The SY-211 board is defective
CSP-5000E
CSPK-5000E
[Equipment] VOM
NO
YES
NO
YES
YES
NO
NO
YES
Plug in the power supply
cord correctly
Verify that
NO
the LED lights
Feed the AC mains
as specified
NO
Verify that
the LED lights
Replace the fuse
after solving the problems
Check to see
YES
if the power supply secondary
is short-circuited
NO
The switching regulator is
out of order. Replace it
YES
YES
End
3-3
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