Hitachi RAM-40QH5 Service Manual page 65

PAM CIRCUIT
Phenomenon 1 (Rotation speed does not increase)
Is DC voltage 330V or more
present across + , — tab
of SPM2?
Yes
Is OVL lamp lighting?
Where OVL lamp lights,
this indicates over-load
and is not abnormal.
Over-voltage error (blinks 15 times): System power module (SPM2) is abnormal.
No
Check cords connected to
system power module again.
If any cord is disconnected,
connect correctly.
– 71 –
Check diode stack.
If phenomenon persists,
replace system power module.