Yamaha PDM-4220 Service Manual page 23

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Power
Power cannot be turned on (LED does not light)
Is the input voltage
applied to Power supply unit?
(CN61
Yes
Are the voltages
applied to CN63
and CNPPS
of Power supply unit ?
Yes
Joint / Formatter PWB
No
, )
AC inlet
pins
No
pins
[CN63]
+5V
+3.3V
AC Fuse
Power switch
F902 T6.3AH 250V
[CNPPS]
+30V
+ 5V
+12V
+10V
PDM-4220
Filter PWB
Power supply unit
*Re-adjustment is reqired.
Plese refer to 21 page.
23

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