Yamaha PDM-4210 Service Manual page 22

PDM-4210
Troubleshooting (POWER)
Power cannot be turned on (LED does not light)
applied to Power supply unit?
applied to CN63
and CNPPS
Picture is displayed. But no sound
Speaker terminal and
applied to EAJ1
applied to EAF1
on Speaker Terminals?
22
Is the input voltage
No
(CN61 , )
Yes AC inlet
Are the voltages
pins
No
pins
of Power supply unit ?
[CN63]
Yes
Formatter PWB
Check
Unlocked
Speaker cord.
Locked
No sound
Are the voltages
No
pins
of the Audio PWB?
+ 5V
Yes
+12V
GND
Are the signals
No
pins
of the Audio PWB?
L ch
Yes
R ch
GND
Are there signals
No
Yes
Speaker
Power switch
F901 T6.3AH 250V
+5V [CNPPS] +30V
+3.3V + 5V
+12V
+10V
Check
Are the voltage
applied to EAJ1
(When EAJ1 is
disconnected.)
Yes
Audio PWB
Formatter PWB or
Video PWB
Audio PWB
AC Fuse
FILTER PWB
Power supply unit
pins? No
Power supply
unit