Ablerex 3 MS series - 4.6. Fan Still Working After Switch Off

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4.6. Main Switch Off, Remove Utility, the Fan is Still Working.
Check Items Trouble-shooting
Self-Keeping Circuit is out of order 1. Please check the related circuit as shown in
4-2.
2. Cut off the Utility, turn off the front switch then
remove and re-connect the harness of the battery
to see whether the fan still remains spinning. If
so, it means Q6, Q7 or Q25 could be defective.
CPU Shutdown function is out of order Cut off the Utility, turn off the front switch then
Remove of the battery, to see if the fan still remains
spinning. If not, you may re-
start up the UPS.
However, you are recommended to replace the
CPU.
NOTE A: After replace the defective devices, make sure other parts of UPS is Normal by
following the steps below:
1. Cut off the Utility. Remove the control board. Provide 36Vdc to CN5 and CN4
by a DC Power Supply, connect CN2 to the main switch. Push on the main
switch to see if DC POWER of UPS, i.e. VDD(18-16V), VCC(12V) and
+/-5V is normal. You may check VDD at CN1.1, VCC at CN1.3, +5V at
CN1.5, Ground at CN1.7 or CN4, -5V at CNCN1.9.
2. Turn off the power supply, connect the logic board with driver board
and LED board.
3. Turn on the DC Power Supply, and add the Utility. Push the Main Switch.
Check the LED signals and Inverter output. Remove the Utility. Check
again the LEDs and Inverter voltage.
4. Connect the battery harness. Compose the other of UPS.
NOTE B: Once the IGBT is defective, the photo coupler(PC923) related normally
need to be replaced, too.