When The Dispenser Panel Pba Does Not Operate Normally - Samsung RF28R7201 AA Series Service Manual

4-2-10. When the Dispenser Panel PBA does not operate normally

There is a MICOM embedded in the Dispenser Panel PCB. So, take care when doing repairs.
And, except the Solder Touch, replace the PCB.
① Check the Panel Connectors.
Check the Wire Cut and the Wire Short.
② Check the wire connection between the Dispenser Panel
and the Main PCB Connector.
Check the Wire Cut and the Wire Short.
② When the Panel PCB buttons do not work
※ When it keeps troubling after check with the above procedures
[Check after turning off the unit and turning it on again]
Since all Touch is used for the Panel PCB Switch, be sure to turn off the unit and turn it on again after doing a repair.
[It is to adjust the sensitivity of the Touch Panel.]
Start
Is the
connetor insertion of dispenser
panel nomal?
No
MAIN PCB
Connector (CN60) is inserted
normally?
Yes
The
Panel PCB Connecter is connected
properly?
Yes
When replacing Panel-PCB,
it lights up?
Yes
Buttons
get stuck being pressed
down?
No
Buttons
get stuck being pressed
down?
Yes
Buttons
get stuck being pressed
down?
Yes
① Check the Dispenser Panel Connectors.
Check the Wire Cut and the Wire Short.
② Check the wire connection Cabinet.
Check the Wire Cut and the Wire Short.
③ Check Short/Open at the Panel Communication & the Power Supply Circuit of the Main PCB.
No
No
Reinsert connector in MAIN PCB.
No
Insert Connector again Repair the
No
Yes
No
No
91
TROUBLESHOOTING
Reinsert Connector.
Repair bad contact.
contact trouble.
Replace Panel PCB.
Re-assemble PCB ASS'Y
or clear the restriction.
Re-assemble PCB ASS'Y
or clear the restriction.
Replace Panel PCB.