Hitachi RAI-50NH5 - Troubleshooting Switching and Speed Errors

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LD301 blinks 6 time.
The temperature at the
OH thermistor rises.
LD301 blinks 5 time.
Overload lower limit cut.
LD301 blinks 4 time.
Failure of switching.
LD301 blinks 3 time.
Abnormal low speed.
Replace parts in the
thermistor circuit.
No
No
No
Check continuity of new parts.
Check continuity of pattern and
lead wires according to the
P.W.B. and schematic diagrams.
Yes
Yes
Replace system power
module or defective parts.
Replace the system power
module.
Replace any defective
parts.
Is the thermistor circuit normal?
Are R503, R541, R542, R549
and peripheral circuits of
system power module normal?
Replace the main P.W.B.
Is the system power module
normal?
Is the drive circuit normal?
0274E Pg 97-118(RAI-50NH5) 19/10/05, 3:37 PM106