Symptom:
* The LEDs on the front panel do
not work when connecting the power cord.
**The SMPS relay does not work
when connecting the power cord.
*** The power of the unit seems
to be out of order.
Major Checklist
The SMPS relay or the LEDs on the
front panel do not work when connecting the power cord if the cables are
improperly connected or the Main Board or SMPS is out of order. In this case,
check the following:
* Check the internal cable
connection status inside the unit.
** Check the fuses of each part.
*** Check the output voltage of SMPS.
**** Replace the Main Board.
When the unit is repeatedly
turned on and off
In general, the SMPS relay
repeatedly turns on and off by the protection function due to a defect on a
board connected to the SMPS.
* Disconnect all cables from the
SMPS, operate the SMPS alone and check if the SMPS works properly and if each
voltage output is correct.
** If the symptom continues even
when SMPS is operated alone, replace the SMPS.
If the symptom is not observed
when operating the SMPS alone, find any defective ASSYs by connecting the
cables one by one.
When separating and connecting
the cables such as CN809 of the Main SMPS, CN1, CN2, CN3, CN4 and CN5 of DC-DC SMPS,
CN of the X Main Board, and CN of the Y Main Board, a spark may be generated by
the electric charge of the high capacity capacitor. Therefore, wait some time
after separating the power cord from the unit.
