— 48 —
7. TROUBLESHOOTING
This portion of the service manual lists all possible malfunctions that may occur when operating the QT-7300
system. To assist you in fully analyzing the problem, the following table also includes an up-to-date list of
symptoms and probable cause(s). In case you encounter problems or discover causes not included in this
section, we highly recommend you to consult CASIO engineers.
Symptoms
Probable Causes
– Loose power cable connection at the bottom of the front panel
■
Turn OFF system power then disconnect the power cord. Insert the
power cord back into the inlet connector then turn ON the system power.
The power LED
– The connection of female jacks to the power supply inlet connector is
indicator on the front
loose.
panel does not light
■
Remove the back cover of the system and check each connection to the
up.
power supply inlet connector.
– Loose connection on the bronze and blue copper wires of the power switch
■
Check each connection.
– Power supply unit is out-of-order,
■
Replace the power supply unit.
– Monitor cable is not properly installed to connector VGA of the system.
– Loose connection between the multi-I/O (VGA) expansion card and the
Abnormal VGA screen
CPU card.
display
■
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.
– The brightness control is not properly adjusted.
■
Adjust the brightness control to a satisfactory level.
– Inverted connection (from LCD converter board to CPU card) of the 44-pin
LCD converter cable
■
Adjust and install the LCD converter cable properly.
– Loose connection between the LCD converter board and the LCD panel
■
Pull out the LCD converter board from the LCD panel then re-install it
Abnormal LCD screen
back.
display
If symptoms still persist at this stage, replace the LCD converter board
and/or the LCD converter cable
– Defective LCD panel and/or inverter
■
Replace the LCD panel and/or inverter.
– Defective CPU card
■
Replace the CPU card of the system.
– Incorrect BIOS version
■
Upgrade the BIOS version. Consult CASIO engineers for the latest
version.
– Loose connection between the multi-I/O (COMx) expansion card and the
CPU card.
COM Port is not
■
Pull out the multi-I/O expansion card from the CPU card then re-install it
functioning
back. If symptoms persist, replace the multi-I/O expansion card.
– Defective CPU card
■
Replace the CPU card of the System.
Содержание QT-7300 Series
Страница 1: ...SERVICE MANUAL ELECTRONIC CASH REGISTER without price QT 7300 EX 963 MAY 2001 ...
Страница 11: ... 9 11 Release the 9 screws of the Mother board Then remove the Mother board 1 2 3 4 5 6 7 8 9 ...
Страница 46: ... 44 All dots off All dots on A vertical line moves from right to left 1 2 3 4 5 6 7 8 1 1 1 1 1 1 1 1 ...
Страница 84: ... 82 10 DRAWER DL 2773 M Type ...
Страница 86: ... 84 DL 2915 M Type ...
Страница 88: ... 86 DL 3615 L Type ...
Страница 90: ... 88 11 DRAWING ...