Specifications

FRONT PANEL
ASSEMBLY
There are three Front Panel Assembly related failures:
q
Non responsive keys
q
Non responsive front panel knob
q
LCD Display problems
Front Panel
Keys/Knobs
Problem
The following could cause non-responsiveness:
q
Defective keypad
q
Corroded key traces on front panel PCB assembly
q
Defective front panel knob encoder
To troubleshoot a front panel key or knob problem, use the following pro
-
cedure:
1. Press the Utility key and select the following soft keys:
DIAGNOSTICS
PERIPHERAL TESTS
FRONT PANEL
2. Follow the instructions on the LCD screen until the test is com-
pleted.
3. If the test fails, replace the front panel PCB assembly and keypad.
LCD Problems To troubleshoot an LCD problem, use the following procedure:
1. Connect an external VGA monitor to the rear panel. If no dislay ap-
pears on the VGA display, check the PDU output voltages (see previ-
ous page). If the voltages are OK, replace the CPU assembly.
2. If the external VGA display is OK, the following assemblies may
have failed and in need of replacement:
q
Backlight Lamp (replaceable on Sharp model LQ9D340 only)
q
Backlight Driver PCB
q
LCD Display (only Anritsu part number 15-100 is available)
q
CPU Assembly
Floppy Drive
Read/Write
Problems
The floppy disk drive is not serviceable. If the unit fails to read or write
data, the disk drive head may need cleaning. Any standard floppy disk
drive cleaning kit may be used to clean the disk drive head. Follow the
manufacturer’s instructions for using the cleaning kit.
6-22 MS462XX MM
HARDWARE TROUBLESHOOTING TROUBLESHOOTING
Hint
If the image on the
LCD display is upside
down, disconnect
and then reconnect
the LCD flex cable.
This should correct
the problem.