Hitachi P50H401/DW3-U Service Manual page 120

...from the previous page
Unplug EMP0 connector from the
POD-PW01 terminal and check the
voltages in the PA01 connector at
the main digital board pin no. 1
(+3.3Vdc) and pin no 80 (+5.6Vdc).
Repair/Replace
Are any of the
Yes
POD PWB.
voltages OK?
No
Repair/Replace
Digital Main
Main Digital
PWB
PA01, pin no. 80, +5.6Vdc PA01, pin no. 1, +3.3Vdc
118