Casio QT-7300 Service Manual page 51

Symptoms
Network function is not
working
Cash drawer ports not
functioning
Printer port is not
working
Keyboard/Mouse/FDD
are not functioning
HDD is not working
Touchscreen feature is
not functioning
properly
– Improper connection of the network cable
Check the RJ-45 connector installed on the NET port of the multi-I/O
expansion card.
– Loose connection between the multi-I/O (NET) expansion card and the
CPU card.
Pull out the multi-I/O expansion card from the CPU card then re-install
it back. If symptoms persist, replace the multi-I/O expansion card.
– Defective CPU card
Replace the CPU card of the System.
– Loose connection between the cash drawer connector board and multi-
I/O expansion card
Pull out the cash drawer connector board from the multi-I/O expansion
card then re-install it back. If symptoms persist, replace the cash drawer
connector board.
– Defective multi-I/O expansion card
Replace the multi-I/O expansion card of the system.
– Defective CPU card
Replace the CPU card of the System.
– Loose connection between the multi-I/O (PRN) expansion card and the
CPU card.
Pull out the multi-I/O expansion card from the CPU card then re-install it
back. If symptoms persist, replace the multi-I/O expansion card.
– Defective CPU card
Replace the CPU card of the System.
– Loose connection between the keyboard /mouse/FDD expansion card
and the CPU card.
Pull out the keyboard/mouse/FDD expansion card from the CPU card
then re-install it back. If symptoms persist, replace the keyboard/mouse/
FDD expansion card.
– Defective CPU card
Replace the CPU card of the System.
– Inverted connection (from HDD to CPU card) of the 44-pin HDD cable
Adjust and install the HDD cable properly.
– Defective hard drive
Replace the hard disk drive of the system.
– Defective CPU card
Replace the CPU card of the System.
– Improper connection (from CN1 of touchscreen control board to COM3 of
the multi-I/O expansion card) of the 10-pin touchscreen control cable
Adjust and install the touchscreen control cable property.
– Loose power connection on CN2 of the touchscreen control board.
Pull out the power cable on CN2 then re-install it back. If symptoms
persist, consult CASIO engineers.
– Defective touchscreen control board
Replace the touchscreen control board of the system.
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Probable Causes