Hitachi RAM-60QH4 Manuel De Service page 128

PAM circuit
Phenomenon 1 (rotation speed does not increase.)
Is DC voltage 330V or more?
YES
Is OVL lamp lighting?
When OVL lamp lights, this
indicates over-load and is not
abnormal.
Over-voltage error (blinks 15 times): System power module (SPM) is abnormal.
NO
– 140 –
Check cords connected to
system power module again.
If any cord is disconnected,
connect correctly.
If phenomenon persists,
replace system power module.