Flow Chart - Hitachi SM0063 Service Manual

Flow Chart

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
Formatter PWB
Picture is displayed. But no sound
Check
Speaker terminal and
Speaker cord.
Locked
Are the voltages
applied to EAJ1
of the Audio PWB?
Yes
Are the signals
applied to EAF1
of the Audio PWB?
Yes
Are there signals
on Speaker Terminals?
Yes
Speaker
42PMA300EZ (PW1A)
No
AC inlet
pins
No
pins
[CN63] +5V
+3.3V
Unlocked
Check
No sound
No
pins
+ 5V
+12V
GND
No
pins
L ch
R ch
Formatter PWB or
GND
Video PWB
No
Audio PWB
27
AC Fuse
Power switch
F901 T6.3AH 250V
[CNPPS] +30V
+ 5V
+12V
+10V
Are the voltage
applied to EAJ1 pins?
(When EAJ1 is
disconnected.)
Yes
Audio PWB
FILTER PWB
Power supply unit
No
Power supply
unit