Hitachi RAM-90QH5, Service Manual, Page: 71 / 83

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LD301: Blinks ten times
Abnormal Voltage
LD301: Blinks twelve times
Fan Lock
Check the connector CN30
and CN31, has it been
inserted properly?
Connect it properly
Replace the MAIN P.W.B
Replace Active module
LD301: Blinks thirteen times
E
2
Prom error
LD301: Blinks forteen times
Act error
Yes
Yes
Rotate the fan by hand,
is it turn easily?
Yes
Power P.W.B may be broken.
Replace Power P.W.B
Check the connecting wire
between Act module-Capa board,
Capa board-IPM board, has it
been connected properly?
Yes
Yes
Yes
Check the power source voltage
(terminal board, L/N terminal)
OK
AC187V-276V
Yes
Check the wiring (DB2
blue/yellow/gray/red)
Abnormal
noise
No
Fan motor may be broken
Connect it properly.
No
No
No
DANGER! Quickly
turn off the
power source.
Replace the ACT
module and IPM
board.
NG AC187V or less
or AC276V or more
DC 264V - 390V
Power source abnormal. Check
the power source.
Turn off the power source, and return
the yellow and blue wires and remove
the gray and red wire from the DB2.
Connect the power source again, and
forcibly turn on the cooling (clicking
noise). Then check the DC voltage
between the gray and red wire with
in three minutes of power relay being
turned on.
AC 187V - 276V
No
DB2 may be broken.
Replace the DB2.
Replace the
Power P.W.B.
Less then 187V
or more than 276V
Less than 10V
Connect the power source, then wait for
few minutes, and forcibly turn on the
cooling. After the power relay goes on
(clicking sound) *1, check that the
compressor does not work after the LED
blinks ten times *2, then within three
minutes check the voltage between ACT
module P terminal and the lo terminal.
Turn off the power source, and remove
the yellow and blue wires from the DB2.
Connect the power source, then wait a
few minutes, and forcibly turn on the
cooling (click sound). Then check the AC
voltage between the blue and yellow
wires within three minutes of the power
relay being turned on.
*1 The power relay does not turn on without an operation order. In the case of
abnormally stop, the power realy turns off after approximately three minutes.
*2 Carry out each of the voltage checkes in the three minutes between the
power relay turning on and turning off.