Subject to Export Control, see Cover Page for details. 2-9
TROUBLESHOOTING TABLE (cont)
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
8 Display is blank or abnormality exists in Display
Step 1. Press the POWER Key.
Step 2. Check and/or adjust Contrast and Backlight levels.
Step 3. Troubleshoot the circuit between the Power Supply PCB Assy and the LCD
Assy.
Probable source of failure is the Power Supply PCB Assy.
Probable source of failure is the RF Digitizer PCB Assy.
Probable source of failure is the Multi-Function PCB Assy.
Probable source of failure is the LCD Assy.
Step 4. Look for a short on the RF Digitizer PCB Assy, Multi-Function PCB Assy
and RF Assy.
Probable source of failure is the RF Digitizer PCB Assy.
Probable source of failure is the Multi-Function PCB Assy.
Probable source of failure is the RF Assy.
9 Display Contrast cannot be adjusted
Troubleshoot the circuitry between the Multi-Function PCB Assy and the Keypad PCB
Assy.
Probable source of failure is the Multi-Function PCB Assy.
Probable source of failure is the Keypad PCB Assy.
10 Display Backlight cannot be adjusted
Troubleshoot the circuitry between the Multi-Function PCB Assy and the Keypad PCB
Assy.
Probable source of failure is the Multi-Function PCB Assy.
Probable source of failure is the Keypad PCB Assy.
11 Keys inoperable
Troubleshoot the circuit between the Power Supply PCB Assy and the Keypad PCB
Assy.
Probable source of failure is the Power Supply PCB Assy.
Probable source of failure is the RF Digitizer PCB Assy.
Probable source of failure is the Multi-Function PCB Assy.
Probable source of failure is the Keypad PCB Assy.
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